# @ohos.multimedia.media (Media)

> **NOTE**
>
> The initial APIs of this module are supported since API version 6. Newly added APIs will be marked with a superscript to indicate their earliest API version.

The multimedia subsystem provides a set of simple and easy-to-use APIs for you to access the system and use media resources.

This subsystem offers the following audio and video services:

- Audio and video playback ([AVPlayer](#avplayer9)<sup>9+</sup>)

- Audio and video recording [AVRecorder](#avrecorder9)<sup>9+</sup>)

- Video transcoding ([AVTranscoder](#avtranscoder12)<sup>12+</sup>)

- Obtaining audio and video metadata ([AVMetadataExtractor](#avmetadataextractor11)<sup>11+</sup>)

- Obtaining video thumbnails ([AVImageGenerator](#avimagegenerator12)<sup>12+</sup>)

- Screen capture ([AVScreenCaptureRecorder](#avscreencapturerecorder12)<sup>12+</sup>)

## Modules to Import

```ts
import { media } from '@kit.MediaKit';
```

## media.createAVPlayer<sup>9+</sup>

createAVPlayer(callback: AsyncCallback\<AVPlayer>): void

Creates an **AVPlayer** instance. This API uses an asynchronous callback to return the result.

> **NOTE**
>
> - You are advised to create a maximum of 16 **AVPlayer** instances for an application in both audio and video playback scenarios.<!--Del-->
> - The actual number of instances that can be created may be different. It depends on the specifications of the device chip in use. For example, in the case of RK3568, you are advised to create a maximum of 6 **AVPlayer** instances for an application in audio and video playback scenarios.<!--DelEnd-->

**Atomic service API**: This API can be used in atomic services since API version 11.

**System capability**: SystemCapability.Multimedia.Media.AVPlayer

**Parameters**

| Name  | Type                                 | Mandatory| Description                                                        |
| -------- | ------------------------------------- | ---- | ------------------------------------------------------------ |
| callback | AsyncCallback\<[AVPlayer](#avplayer9)> | Yes  | Callback used to return the result. If the operation is successful, an **AVPlayer** instance is returned; otherwise, **null** is returned. The instance can be used to play audio and video.|

**Error codes**

For details about the error codes, see [Media Error Codes](errorcode-media.md).

| ID| Error Message                      |
| -------- | ------------------------------ |
| 5400101  | No memory. Return by callback. |

**Example**

```ts
import { BusinessError } from '@kit.BasicServicesKit';

let avPlayer: media.AVPlayer;
media.createAVPlayer((error: BusinessError, video: media.AVPlayer) => {
  if (video != null) {
    avPlayer = video;
    console.info('Succeeded in creating AVPlayer');
  } else {
    console.error(`Failed to create AVPlayer, error message:${error.message}`);
  }
});
```

## media.createAVPlayer<sup>9+</sup>

createAVPlayer(): Promise\<AVPlayer>

Creates an **AVPlayer** instance. This API uses a promise to return the result.

> **NOTE**
>
> - You are advised to create a maximum of 16 **AVPlayer** instances for an application in both audio and video playback scenarios.<!--Del-->
> - The actual number of instances that can be created may be different. It depends on the specifications of the device chip in use. For example, in the case of RK3568, you are advised to create a maximum of 6 **AVPlayer** instances for an application in audio and video playback scenarios.<!--DelEnd-->

**Atomic service API**: This API can be used in atomic services since API version 11.

**System capability**: SystemCapability.Multimedia.Media.AVPlayer

**Return value**

| Type                           | Description                                                        |
| ------------------------------- | ------------------------------------------------------------ |
| Promise\<[AVPlayer](#avplayer9)> | Promise used to return the result. If the operation is successful, an **AVPlayer** instance is returned; otherwise, **null** is returned. The instance can be used to play audio and video.|

**Error codes**

For details about the error codes, see [Media Error Codes](errorcode-media.md).

| ID| Error Message                     |
| -------- | ----------------------------- |
| 5400101  | No memory. Return by promise. |

**Example**

```ts
import { BusinessError } from '@kit.BasicServicesKit';

let avPlayer: media.AVPlayer;
media.createAVPlayer().then((video: media.AVPlayer) => {
  if (video != null) {
    avPlayer = video;
    console.info('Succeeded in creating AVPlayer');
  } else {
    console.error('Failed to create AVPlayer');
  }
}).catch((error: BusinessError) => {
  console.error(`Failed to create AVPlayer, error message:${error.message}`);
});
```

## media.createAVRecorder<sup>9+</sup>

createAVRecorder(callback: AsyncCallback\<AVRecorder>): void

Creates an **AVRecorder** instance. This API uses an asynchronous callback to return the result.

> **NOTE**
>
> - A maximum of 2 **AVRecorder** instances can be created.
> - Only one instance can perform audio recording on a device at one time, since all the applications share the audio channel. Any attempt to create the second instance for audio recording fails due to audio channel conflicts.

**System capability**: SystemCapability.Multimedia.Media.AVRecorder

**Parameters**

| Name  | Type                                      | Mandatory| Description                                                        |
| -------- | ------------------------------------------ | ---- | ------------------------------------------------------------ |
| callback | AsyncCallback\<[AVRecorder](#avrecorder9)> | Yes  | Callback used to return the result. If the operation is successful, an **AVRecorder** instance is returned; otherwise, **null** is returned. The instance can be used to record audio and video.|

**Error codes**

For details about the error codes, see [Media Error Codes](errorcode-media.md).

| ID| Error Message                      |
| -------- | ------------------------------ |
| 5400101  | No memory. Return by callback. |

**Example**

```ts
import { BusinessError } from '@kit.BasicServicesKit';
let avRecorder: media.AVRecorder;

media.createAVRecorder((error: BusinessError, recorder: media.AVRecorder) => {
  if (recorder != null) {
    avRecorder = recorder;
    console.info('Succeeded in creating AVRecorder');
  } else {
    console.error(`Failed to create AVRecorder, error message:${error.message}`);
  }
});
```

## media.createAVRecorder<sup>9+</sup>

createAVRecorder(): Promise\<AVRecorder>

Creates an **AVRecorder** instance. This API uses a promise to return the result.

> **NOTE**
>
> - A maximum of 2 **AVRecorder** instances can be created.
> - Only one instance can perform audio recording on a device at one time, since all the applications share the audio channel. Any attempt to create the second instance for audio recording fails due to audio channel conflicts.

**Atomic service API**: This API can be used in atomic services since API version 12.

**System capability**: SystemCapability.Multimedia.Media.AVRecorder

**Return value**

| Type                                | Description                                                        |
| ------------------------------------ | ------------------------------------------------------------ |
| Promise\<[AVRecorder](#avrecorder9)> | Promise used to return the result. If the operation is successful, an **AVRecorder** instance is returned; otherwise, **null** is returned. The instance can be used to record audio and video.|

**Error codes**

For details about the error codes, see [Media Error Codes](errorcode-media.md).

| ID| Error Message                     |
| -------- | ----------------------------- |
| 5400101  | No memory. Return by promise. |

**Example**

```ts
import { BusinessError } from '@kit.BasicServicesKit';

let avRecorder: media.AVRecorder;
media.createAVRecorder().then((recorder: media.AVRecorder) => {
  if (recorder != null) {
    avRecorder = recorder;
    console.info('Succeeded in creating AVRecorder');
  } else {
    console.error('Failed to create AVRecorder');
  }
}).catch((error: BusinessError) => {
  console.error(`Failed to create AVRecorder, error message:${error.message}`);
});
```

## media.createAVTranscoder<sup>12+</sup>

createAVTranscoder(): Promise\<AVTranscoder>

Creates an **AVTranscoder** instance. This API uses a promise to return the result.

> **NOTE**

> A maximum of 2 **AVTranscoder** instances can be created.

**System capability**: SystemCapability.Multimedia.Media.AVTranscoder

**Return value**

| Type                           | Description                                                        |
| ------------------------------- | ------------------------------------------------------------ |
| Promise\<[AVTranscoder](#avtranscoder12)> | Promise used to return the result. If the operation is successful, an **AVTranscoder** instance is returned; otherwise, **null** is returned. The instance can be used for video transcoding.|

**Error codes**

For details about the error codes, see [Media Error Codes](errorcode-media.md).

| ID| Error Message                     |
| -------- | ----------------------------- |
| 5400101  | No memory. Return by promise. |

**Example**

```ts
import { BusinessError } from '@kit.BasicServicesKit';

let avTranscoder: media.AVTranscoder;
media.createAVTranscoder().then((transcoder: media.AVTranscoder) => {
  if (transcoder != null) {
    avTranscoder = transcoder;
    console.info('Succeeded in creating AVTranscoder');
  } else {
    console.error('Failed to create AVTranscoder');
  }
}).catch((error: BusinessError) => {
  console.error(`Failed to create AVTranscoder, error message:${error.message}`);
});
```

## media.createAVMetadataExtractor<sup>11+</sup>

createAVMetadataExtractor(callback: AsyncCallback\<AVMetadataExtractor>): void

Creates an **AVMetadataExtractor** instance. This API uses an asynchronous callback to return the result.

**System capability**: SystemCapability.Multimedia.Media.AVMetadataExtractor

**Parameters**

| Name  | Type                                 | Mandatory| Description                                                        |
| -------- | ------------------------------------- | ---- | ------------------------------------------------------------ |
| callback | AsyncCallback\<[AVMetadataExtractor](#avmetadataextractor11)> | Yes  | Callback used to return the result. If the operation is successful, **err** is **undefined** and **data** is the **AVMetadataExtractor** instance created; otherwise, **err** is an error object.|

**Error codes**

For details about the error codes, see [Media Error Codes](errorcode-media.md).

| ID| Error Message                      |
| -------- | ------------------------------ |
| 5400101  | No memory. Returned by callback. |

**Example**

```ts
import { BusinessError } from '@kit.BasicServicesKit';

let avMetadataExtractor: media.AVMetadataExtractor;
media.createAVMetadataExtractor((error: BusinessError, extractor: media.AVMetadataExtractor) => {
  if (extractor != null) {
    avMetadataExtractor = extractor;
    console.info('Succeeded in creating AVMetadataExtractor');
  } else {
    console.error(`Failed to create AVMetadataExtractor, error message:${error.message}`);
  }
});
```

## media.createAVMetadataExtractor<sup>11+</sup>

createAVMetadataExtractor(): Promise\<AVMetadataExtractor>

Creates an **AVMetadataExtractor** instance. This API uses a promise to return the result.

**System capability**: SystemCapability.Multimedia.Media.AVMetadataExtractor

**Error codes**

For details about the error codes, see [Media Error Codes](errorcode-media.md).

| ID| Error Message                      |
| -------- | ------------------------------ |
| 5400101  | No memory. Returned by promise. |

**Example**

```ts
import { BusinessError } from '@kit.BasicServicesKit';

let avMetadataExtractor: media.AVMetadataExtractor;
media.createAVMetadataExtractor().then((extractor: media.AVMetadataExtractor) => {
  if (extractor != null) {
    avMetadataExtractor = extractor;
    console.info('Succeeded in creating AVMetadataExtractor');
  } else {
    console.error(`Failed to create AVMetadataExtractor`);
  }
}).catch((error: BusinessError) => {
  console.error(`Failed to create AVMetadataExtractor, error message:${error.message}`);
});
```

## media.createSoundPool<sup>10+</sup>

createSoundPool(maxStreams: number, audioRenderInfo: audio.AudioRendererInfo, callback: AsyncCallback\<SoundPool>): void

Creates a **SoundPool** instance. This API uses an asynchronous callback to return the result.

**System capability**: SystemCapability.Multimedia.Media.SoundPool

**Parameters**

| Name  | Type                                           | Mandatory| Description                                                        |
| -------- | ----------------------------------------------- | ---- | ------------------------------------------------------------ |
| maxStreams | number | Yes  | Maximum number of streams that can be played by the **SoundPool** instance.|
| audioRenderInfo | [audio.AudioRendererInfo](../apis-audio-kit/js-apis-audio.md#audiorendererinfo8)  | Yes  | Audio renderer parameters. When the **usage** parameter in **audioRenderInfo** is set to **STREAM_USAGE_UNKNOWN**, **STREAM_USAGE_MUSIC**, **STREAM_USAGE_MOVIE**, or **STREAM_USAGE_AUDIOBOOK**, the SoundPool uses the audio mixing mode when playing a short sound, without interrupting the playback of other audios.|
| callback | AsyncCallback<[SoundPool](js-apis-inner-multimedia-soundPool.md)> | Yes  | Callback used to return the result. If the operation is successful, a **SoundPool** instance is returned; otherwise, **null** is returned. The instance is used for loading and playback.|

**Error codes**

For details about the error codes, see [Media Error Codes](errorcode-media.md).

| ID| Error Message                      |
| -------- | ------------------------------ |
| 5400101  | No memory. Return by callback. |

**Example**

```js
import { audio } from '@kit.AudioKit';

let soundPool: media.SoundPool;
let audioRendererInfo: audio.AudioRendererInfo = {
  usage : audio.StreamUsage.STREAM_USAGE_MUSIC,
  rendererFlags : 0
}

media.createSoundPool(5, audioRendererInfo, (error, soundPool_: media.SoundPool) => {
  if (error) {
    console.error(`Failed to createSoundPool`)
    return;
  } else {
    soundPool = soundPool_;
    console.info(`Succeeded in createSoundPool`)
  }
});
```

## media.createSoundPool<sup>10+</sup>

createSoundPool(maxStreams: number, audioRenderInfo: audio.AudioRendererInfo): Promise\<SoundPool>

Creates a **SoundPool** instance. This API uses a promise to return the result.

**System capability**: SystemCapability.Multimedia.Media.SoundPool

**Parameters**

| Name  | Type                                           | Mandatory| Description                                                        |
| -------- | ----------------------------------------------- | ---- | ------------------------------------------------------------ |
| maxStreams | number | Yes  | Maximum number of streams that can be played by the **SoundPool** instance.|
| audioRenderInfo | [audio.AudioRendererInfo](../apis-audio-kit/js-apis-audio.md#audiorendererinfo8)  | Yes  | Audio renderer parameters.|

**Return value**

| Type                                     | Description                                                        |
| ----------------------------------------- | ------------------------------------------------------------ |
| Promise<[SoundPool](js-apis-inner-multimedia-soundPool.md)> | Promise used to return the result. If the operation is successful, a **SoundPool** instance is returned; otherwise, **null** is returned. The instance is used for loading and playback.|

**Error codes**

For details about the error codes, see [Media Error Codes](errorcode-media.md).

| ID| Error Message                     |
| -------- | ----------------------------- |
| 5400101  | No memory. Return by promise. |

**Example**

```js
import { audio } from '@kit.AudioKit';
import { BusinessError } from '@kit.BasicServicesKit';

let soundPool: media.SoundPool;
let audioRendererInfo: audio.AudioRendererInfo = {
  usage : audio.StreamUsage.STREAM_USAGE_MUSIC,
  rendererFlags : 0
}

media.createSoundPool(5, audioRendererInfo).then((soundpool_: media.SoundPool) => {
  if (soundpool_ != null) {
    soundPool = soundpool_;
    console.info('Succceeded in creating SoundPool');
  } else {
    console.error('Failed to create SoundPool');
  }
}, (error: BusinessError) => {
  console.error(`soundpool catchCallback, error message:${error.message}`);
});
```

## media.createAVScreenCaptureRecorder<sup>12+</sup>

createAVScreenCaptureRecorder(): Promise\<AVScreenCaptureRecorder>

Creates an **AVScreenCaptureRecorder** instance. This API uses a promise to return the result.

**System capability**: SystemCapability.Multimedia.Media.AVScreenCapture

**Return value**

| Type                                                        | Description                                                        |
| ------------------------------------------------------------ | ------------------------------------------------------------ |
| Promise\<[AVScreenCaptureRecorder](#avscreencapturerecorder12)> | Promise used to return the result. If the operation is successful, an **AVScreenCaptureRecorder** instance is returned; otherwise, **null** is returned. The instance can be used for screen capture.|

**Error codes**

| ID| Error Message                      |
| -------- | ------------------------------ |
| 5400101  | No memory. Return by promise. |

**Example**

```ts
import { BusinessError } from '@kit.BasicServicesKit';

let avScreenCaptureRecorder: media.AVScreenCaptureRecorder;
media.createAVScreenCaptureRecorder().then((captureRecorder: media.AVScreenCaptureRecorder) => {
  if (captureRecorder != null) {
    avScreenCaptureRecorder = captureRecorder;
    console.info('Succeeded in createAVScreenCaptureRecorder');
  } else {
    console.error('Failed to createAVScreenCaptureRecorder');
  }
}).catch((error: BusinessError) => {
  console.error(`createAVScreenCaptureRecorder catchCallback, error message:${error.message}`);
});
```

## SoundPool<sup>10+</sup>

type SoundPool = _SoundPool

SoundPool, which APIs for loading, unloading, playing, and stopping playing system sounds, setting the volume, and setting the number of loops.

**System capability**: SystemCapability.Multimedia.Media.SoundPool

| Type    | Description                      |
| -------- | ------------------------------ |
| [SoundPool](js-apis-inner-multimedia-soundPool.md#soundpool)  | Provides APIs for loading, unloading, playing, and stopping playing system sounds, setting the volume, and setting the number of loops.|

## PlayParameters<sup>10+</sup>

type PlayParameters = _PlayParameters

Describes the playback parameters of the sound pool.

**System capability**: SystemCapability.Multimedia.Media.SoundPool

| Type    | Description                      |
| -------- | ------------------------------ |
| [PlayParameters](js-apis-inner-multimedia-soundPool.md#playparameters)  | Playback parameters of the sound pool.|

## AVErrorCode<sup>9+</sup>

Enumerates the [media error codes](errorcode-media.md).

**Atomic service API**: This API can be used in atomic services since API version 11.

**System capability**: SystemCapability.Multimedia.Media.Core

| Name                                 | Value     | Description                                |
| :------------------------------------ | ------- | ------------------------------------ |
| AVERR_OK                              | 0       | The operation is successful.                      |
| AVERR_NO_PERMISSION                   | 201     | No permission to perform the operation.              |
| AVERR_INVALID_PARAMETER               | 401     | Invalid input parameter.                  |
| AVERR_UNSUPPORT_CAPABILITY            | 801     | Unsupported API.       |
| AVERR_NO_MEMORY                       | 5400101 | The system memory is insufficient or the number of services reaches the upper limit.|
| AVERR_OPERATE_NOT_PERMIT              | 5400102 | The operation is not allowed in the current state or you do not have the permission to perform the operation.|
| AVERR_IO                              | 5400103 | The data stream is abnormal.                |
| AVERR_TIMEOUT                         | 5400104 | The system or network response times out.            |
| AVERR_SERVICE_DIED                    | 5400105 | The service process is dead.                  |
| AVERR_UNSUPPORT_FORMAT                | 5400106 | The format of the media asset is not supported.      |
| AVERR_AUDIO_INTERRUPTED<sup>11+</sup> | 5400107 | The audio focus is interrupted.                  |
| AVERR_IO_HOST_NOT_FOUND<sup>14+</sup> | 5411001 | Failed to parse the server address or connect to the server. <br>**Atomic service API**: This API can be used in atomic services since API version 14.       |
| AVERR_IO_CONNECTION_TIMEOUT<sup>14+</sup> | 5411002 | Network connection times out. <br>**Atomic service API**: This API can be used in atomic services since API version 14.      |
| AVERR_IO_NETWORK_ABNORMAL<sup>14+</sup> | 5411003 | Data or links are abnormal due to network exceptions. <br>**Atomic service API**: This API can be used in atomic services since API version 14.      |
| AVERR_IO_NETWORK_UNAVAILABLE<sup>14+</sup> | 5411004 | The network is disabled. <br>**Atomic service API**: This API can be used in atomic services since API version 14.      |
| AVERR_IO_NO_PERMISSION<sup>14+</sup> | 5411005 | No access permission. <br>**Atomic service API**: This API can be used in atomic services since API version 14.    |
| AVERR_IO_REQUEST_DENIED<sup>14+</sup> | 5411006 | The client request parameter is incorrect or exceeds the processing capability. <br>**Atomic service API**: This API can be used in atomic services since API version 14.      |
| AVERR_IO_RESOURCE_NOT_FOUND<sup>14+</sup> | 5411007 | No network resource is available. <br>**Atomic service API**: This API can be used in atomic services since API version 14.      |
| AVERR_IO_SSL_CLIENT_CERT_NEEDED<sup>14+</sup> | 5411008 | The server fails to verify the client certificate. <br>**Atomic service API**: This API can be used in atomic services since API version 14.      |
| AVERR_IO_SSL_CONNECTION_FAILED<sup>14+</sup> | 5411009 | The SSL connection fails. <br>**Atomic service API**: This API can be used in atomic services since API version 14.      |
| AVERR_IO_SSL_SERVER_CERT_UNTRUSTED<sup>14+</sup> | 5411010 | The client fails to verify the server certificate. <br>**Atomic service API**: This API can be used in atomic services since API version 14.      |
| AVERR_IO_UNSUPPORTED_REQUEST<sup>14+</sup> | 5411011 | The request is not supported due to a network protocol error. <br>**Atomic service API**: This API can be used in atomic services since API version 14.      |

## MediaType<sup>8+</sup>

Enumerates the media types.

**System capability**: SystemCapability.Multimedia.Media.Core

| Name          | Value                   | Description                |
| -------------- | --------------------- | ------------------- |
| MEDIA_TYPE_AUD | 0                     | Media.<br>**Atomic service API**: This API can be used in atomic services since API version 11.          |
| MEDIA_TYPE_VID | 1                     | Video.<br>**Atomic service API**: This API can be used in atomic services since API version 11.         |
| MEDIA_TYPE_SUBTITLE<sup>12+</sup> | 2    | Subtitle.<br>**Atomic service API**: This API can be used in atomic services since API version 12.|

## CodecMimeType<sup>8+</sup>

Enumerates the codec MIME types.

**System capability**: SystemCapability.Multimedia.Media.Core

| Name        | Value                   | Description                    |
| ------------ | --------------------- | ------------------------ |
| VIDEO_H263   | 'video/h263'          | Video in H.263 format.     |
| VIDEO_AVC    | 'video/avc'           | Video in AVC format.      |
| VIDEO_MPEG2  | 'video/mpeg2'         | Video in MPEG-2 format.    |
| VIDEO_MPEG4  | 'video/mp4v-es'         | Video in MPEG-4 format.    |
| VIDEO_VP8    | 'video/x-vnd.on2.vp8' | Video in VP8 format.      |
| VIDEO_HEVC<sup>11+</sup>   | 'video/hevc'          | Video in H.265 format.|
| AUDIO_AAC    | 'audio/mp4a-latm'     | Audio in MP4A-LATM format.<br>**Atomic service API**: This API can be used in atomic services since API version 12.|
| AUDIO_VORBIS | 'audio/vorbis'        | Audio in Vorbis format.   |
| AUDIO_FLAC   | 'audio/flac'          | Audio in FLAC format.     |
| AUDIO_MP3<sup>12+</sup>   | 'audio/mpeg'          | Audio in MPEG format.     |
| AUDIO_G711MU<sup>12+</sup>   | 'audio/g711mu'     | Audio in G.711 μ-law format.|

## MediaDescriptionKey<sup>8+</sup>

Enumerates the media description keys.

**System capability**: SystemCapability.Multimedia.Media.Core

| Name                    | Value             | Description                                                        |
| ------------------------ | --------------- | ------------------------------------------------------------ |
| MD_KEY_TRACK_INDEX       | 'track_index'   | Track index, which is a number.<br>**Atomic service API**: This API can be used in atomic services since API version 11.|
| MD_KEY_TRACK_TYPE        | 'track_type'    | Track type, which is a number. For details, see [MediaType](#mediatype8).<br>**Atomic service API**: This API can be used in atomic services since API version 11.|
| MD_KEY_CODEC_MIME        | 'codec_mime'    | Codec MIME type, which is a string.<br>**Atomic service API**: This API can be used in atomic services since API version 11.|
| MD_KEY_DURATION          | 'duration'      | Media duration, which is a number, in units of ms.<br>**Atomic service API**: This API can be used in atomic services since API version 11.|
| MD_KEY_BITRATE           | 'bitrate'       | Bit rate, which is a number, in units of bit/s.<br>**Atomic service API**: This API can be used in atomic services since API version 11.|
| MD_KEY_WIDTH             | 'width'         | Video width, which is a number, in units of pixel.<br>**Atomic service API**: This API can be used in atomic services since API version 11.|
| MD_KEY_HEIGHT            | 'height'        | Video height, which is a number, in units of pixel.<br>**Atomic service API**: This API can be used in atomic services since API version 11.|
| MD_KEY_FRAME_RATE        | 'frame_rate'    | Video frame rate, which is a number, measured in frames per 100 seconds.<br>**Atomic service API**: This API can be used in atomic services since API version 11.|
| MD_KEY_AUD_CHANNEL_COUNT | 'channel_count' | Number of audio channels, which is a number.<br>**Atomic service API**: This API can be used in atomic services since API version 11.|
| MD_KEY_AUD_SAMPLE_RATE   | 'sample_rate'   | Sampling rate, which is a number, in units of Hz.<br>**Atomic service API**: This API can be used in atomic services since API version 11.|
| MD_KEY_AUD_SAMPLE_DEPTH<sup>12+</sup>  | 'sample_depth'  | Bit depth, which is a number, in units of bits.<br>**Atomic service API**: This API can be used in atomic services since API version 12.|
| MD_KEY_LANGUAGE<sup>12+</sup>  | 'language'  | Subtitle language, which is a string.<br>**Atomic service API**: This API can be used in atomic services since API version 12.|
| MD_KEY_TRACK_NAME<sup>12+</sup>  | 'track_name'  | Track name, which is a string.<br>**Atomic service API**: This API can be used in atomic services since API version 12.|
| MD_KEY_HDR_TYPE<sup>12+</sup>  | 'hdr_type'  | Codec track type, which is a string.<br>**Atomic service API**: This API can be used in atomic services since API version 12.|

## PlaybackInfoKey<sup>12+</sup>

Enumerates the playback description keys.

**System capability**: SystemCapability.Multimedia.Media.Core

| Name                    | Value             | Description                                                        |
| ------------------------ | --------------- | ------------------------------------------------------------ |
| SERVER_IP_ADDRESS        | 'server_ip_address'    | IP address of the server, which is a string. |
| AVG_DOWNLOAD_RATE        | 'average_download_rate'| Average download rate, which is a number, in units of bit/s.|
| DOWNLOAD_RATE            | 'download_rate'        | Download rate in one second, which is a number, in units of bit/s.|
| IS_DOWNLOADING           | 'is_downloading'       | Download status, which is a number. The value **1** means that the downloaded is in progress, and **0** means that the download is complete.|
| BUFFER_DURATION          | 'buffer_duration'      | Duration that the cached data can be played, which is a number, in units of seconds.|

## BufferingInfoType<sup>8+</sup>

Enumerates the buffering event types.

**Atomic service API**: This API can be used in atomic services since API version 12.

**System capability**: SystemCapability.Multimedia.Media.Core

| Name             | Value  | Description                            |
| ----------------- | ---- | -------------------------------- |
| BUFFERING_START   | 1    | Buffering starts. When this event is triggered, the player pauses the playback.<br>**Atomic service API**: This API can be used in atomic services since API version 12.                  |
| BUFFERING_END     | 2    | Buffering ends. When this event is triggered, the player resumes the playback.<br>**Atomic service API**: This API can be used in atomic services since API version 12.                  |
| BUFFERING_PERCENT | 3    | Buffering percentage. You can use this event to monitor the buffering status.<br>**Atomic service API**: This API can be used in atomic services since API version 12.                |
| CACHED_DURATION   | 4    | Estimated duration, in ms, that the buffered data can be played. This event is triggered once the data change amount in the buffer exceeds 500 ms. You can use this event to develop a progress bar.<br>**Atomic service API**: This API can be used in atomic services since API version 12. |

## StateChangeReason<sup>9+</sup>

Enumerates the reasons for the state transition of the **AVPlayer** or **AVRecorder** instance. The enum value is reported together with **state**.

**Atomic service API**: This API can be used in atomic services since API version 11.

**System capability**: SystemCapability.Multimedia.Media.Core

| Name      | Value  | Description                                                        |
| ---------- | ---- | ------------------------------------------------------------ |
| USER       | 1    | State transition triggered by user behavior. It happens when a user or the client calls an API.|
| BACKGROUND | 2    | State transition caused by background system behavior. For example, if an application does not have the permission of Media Controller, the application is forcibly suspended or stopped by the system when it switches to the background.|

## AVPlayer<sup>9+</sup>

A playback management class that provides APIs to manage and play media assets. Before calling any API in **AVPlayer**, you must use [createAVPlayer()](#mediacreateavplayer9) to create an **AVPlayer** instance.

For details about the audio and video playback demo, see [Audio Playback](../../media/media/using-avplayer-for-playback.md) and [Video Playback](../../media/media/video-playback.md).

> **NOTE**
>
> When using the **AVPlayer** instance, you are advised to register the following callbacks to proactively obtain status changes:
> - [on('stateChange')](#onstatechange9): listens for AVPlayer state changes.
> - [on('error')](#onerror9): listens for error events.

### Attributes

**System capability**: SystemCapability.Multimedia.Media.AVPlayer

| Name                                               | Type                                                        | Read-Only| Optional| Description                                                        |
| --------------------------------------------------- | ------------------------------------------------------------ | ---- | ---- | ------------------------------------------------------------ |
| url<sup>9+</sup>                                    | string                                                       | No  | Yes  | URL of the media asset. It can be set only when the AVPlayer is in the idle state. <br>The video formats MP4, MPEG-TS, and MKV are supported.<br>The audio formats M4A, AAC, MP3, OGG, WAV, FLAC, and AMR are supported.<br>**Example of supported URLs**:<br>1. FD: fd://xx<br>![](figures/en-us_image_url.png)<br>2. HTTP: http\://xx<br>3. HTTPS: https\://xx<br>4. HLS: http\://xx or https\://xx<br>**NOTE**<br>- To set a network playback path, you must declare the [ohos.permission.INTERNET](../../security/AccessToken/permissions-for-all.md#ohospermissioninternet) permission by following the instructions provided in [Declaring Permissions](../../security/AccessToken/declare-permissions.md). The error code [201](../errorcode-universal.md) may be reported.<br>- WebM is no longer supported since API version 11.<br> - After the resource handle (FD) is transferred to an **AVPlayer** instance, do not use the resource handle to perform other read and write operations, including but not limited to transferring this handle to other **AVPlayer**, **AVMetadataExtractor**, **AVImageGenerator**, or **AVTranscoder** instance. Competition occurs when multiple AVPlayers use the same resource handle to read and write files at the same time, resulting in errors in obtaining data.<br>**Atomic service API**: This API can be used in atomic services since API version 11.|
| fdSrc<sup>9+</sup>                                  | [AVFileDescriptor](#avfiledescriptor9)                       | No  | Yes  | FD of the media asset. It can be set only when the AVPlayer is in the idle state.<br>This attribute is required when media assets of an application are continuously stored in a file.<br>The video formats MP4, MPEG-TS, and MKV are supported.<br>The audio formats M4A, AAC, MP3, OGG, WAV, FLAC, and AMR are supported.<br>**Example:**<br>Assume that a media file that stores continuous assets consists of the following:<br>Video 1 (address offset: 0, byte length: 100)<br>Video 2 (address offset: 101; byte length: 50)<br>Video 3 (address offset: 151, byte length: 150)<br>1. To play video 1: AVFileDescriptor {fd = resource handle; offset = 0; length = 100; }<br>2. To play video 2: AVFileDescriptor {fd = resource handle; offset = 101; length = 50; }<br>3. To play video 3: AVFileDescriptor {fd = resource handle; offset = 151; length = 150; }<br>To play an independent media file, use **src=fd://xx**.<br>**NOTE**<br>WebM is no longer supported since API version 11.<br>**Atomic service API**: This API can be used in atomic services since API version 11.|
| dataSrc<sup>10+</sup>                               | [AVDataSrcDescriptor](#avdatasrcdescriptor10)                | No  | Yes  | Descriptor of a streaming media asset. It can be set only when the AVPlayer is in the idle state.<br>Use scenario: An application starts playing a media file while the file is still being downloaded from the remote to the local host.<br>The video formats MP4, MPEG-TS, and MKV are supported.<br>The audio formats M4A, AAC, MP3, OGG, WAV, FLAC, and AMR are supported.<br>**Example:**<br>A user is obtaining an audio and video file from a remote server and wants to play the downloaded file content. To implement this scenario, do as follows:<br>1. Obtain the total file size, in bytes. If the total size cannot be obtained, set **fileSize** to **-1**.<br>2. Implement the **func** callback to fill in data. If **fileSize** is **-1**, the format of **func** is **func(buffer: ArrayBuffer, length: number)**, and the AVPlayer obtains data in sequence; otherwise, the format is **func(buffer: ArrayBuffer, length: number, pos: number)**, and the AVPlayer seeks and obtains data in the required positions.<br>3. Set **AVDataSrcDescriptor {fileSize = size, callback = func}**.<br>**Notes:**<br>If the media file to play is in MP4/M4A format, ensure that the **moov** field (specifying the media information) is before the **mdat** field (specifying the media data) or the fields before the **moov** field is less than 10 MB. Otherwise, the parsing fails and the media file cannot be played.<br>**NOTE**<br>WebM is no longer supported since API version 11.<br>**Atomic service API**: This API can be used in atomic services since API version 11.|
| surfaceId<sup>9+</sup>                              | string                                                       | No  | Yes  | Video window ID. By default, there is no video window.<br>This parameter can be set when the AVPlayer is in the initialized state.<br>It can be set again when the AVPlayer is in the prepared, playing, paused, completed, or stopped state, in the prerequisite that the video window ID has been set in the initialized state. After the new setting is performed, the video is played in the new window.<br>It is used to render the window for video playback and therefore is not required in audio-only playback scenarios.<br>**Example:**<br>[Create a surface ID through XComponent](../apis-arkui/arkui-ts/ts-basic-components-xcomponent.md#getxcomponentsurfaceid).<br>**Atomic service API**: This API can be used in atomic services since API version 11.|
| loop<sup>9+</sup>                                   | boolean                                                      | No  | No  | Whether to loop playback. The value **true** means to loop playback, and **false** (default) means the opposite. It is a dynamic attribute<br>and can be set only when the AVPlayer is in the prepared, playing, paused, or completed state.<br>This setting is not supported in live mode.<br>**Atomic service API**: This API can be used in atomic services since API version 12.|
| videoScaleType<sup>9+</sup>                         | [VideoScaleType](#videoscaletype9)                           | No  | Yes  | Video scale type. The default value is **VIDEO_SCALE_TYPE_FIT**. It is a dynamic attribute<br>and can be set only when the AVPlayer is in the prepared, playing, paused, or completed state.<br>**Atomic service API**: This API can be used in atomic services since API version 12.|
| audioInterruptMode<sup>9+</sup>                     | [audio.InterruptMode](../apis-audio-kit/js-apis-audio.md#interruptmode9)       | No  | Yes  | Audio interruption mode. The default value is **SHARE_MODE**. It is a dynamic attribute<br>and can be set only when the AVPlayer is in the prepared, playing, paused, or completed state.<br>To take effect, this attribute must be set before [play()](#play9) is called for the first time.<br>**Atomic service API**: This API can be used in atomic services since API version 12.|
| audioRendererInfo<sup>10+</sup>                     | [audio.AudioRendererInfo](../apis-audio-kit/js-apis-audio.md#audiorendererinfo8) | No  | Yes  | Audio renderer information. If the media source contains videos, the default value of **usage** is **STREAM_USAGE_MOVIE**. Otherwise, the default value of **usage** is **STREAM_USAGE_MUSIC**. The default value of **rendererFlags** is 0. If the default value of **usage** does not meet the requirements, configure [audio.AudioRendererInfo](../apis-audio-kit/js-apis-audio.md#audiorendererinfo8).<br>This parameter can be set only when the AVPlayer is in the initialized state.<br>To take effect, this attribute must be set before [prepare()](#prepare9) is called for the first time.<br>**Atomic service API**: This API can be used in atomic services since API version 12.|
| audioEffectMode<sup>10+</sup>                       | [audio.AudioEffectMode](../apis-audio-kit/js-apis-audio.md#audioeffectmode10)  | No  | Yes  | Audio effect mode. The audio effect mode is a dynamic attribute and is restored to the default value **EFFECT_DEFAULT** when **usage** of **audioRendererInfo** is changed. It can be set only when the AVPlayer is in the prepared, playing, paused, or completed state.<br>**Atomic service API**: This API can be used in atomic services since API version 12.|
| state<sup>9+</sup>                                  | [AVPlayerState](#avplayerstate9)                             | Yes  | No  | AVPlayer state. It can be used as a query parameter when the AVPlayer is in any state.<br>**Atomic service API**: This API can be used in atomic services since API version 12.                 |
| currentTime<sup>9+</sup>                            | number                                                       | Yes  | No  | Current video playback position, in ms. It can be used as a query parameter when the AVPlayer is in the prepared, playing, paused, or completed state.<br>The value **-1** indicates an invalid value.<br>In live mode, **-1** is returned by default.<br>**Atomic service API**: This API can be used in atomic services since API version 12.|
| duration<sup>9+</sup> | number                                                       | Yes  | No  | Video duration, in ms. It can be used as a query parameter when the AVPlayer is in the prepared, playing, paused, or completed state.<br>The value **-1** indicates an invalid value.<br>In live mode, **-1** is returned by default.<br>**Atomic service API**: This API can be used in atomic services since API version 11.|
| width<sup>9+</sup>                                  | number                                                       | Yes  | No  | Video width, in px. It can be used as a query parameter when the AVPlayer is in the prepared, playing, paused, or completed state.<br>The value **0** indicates an invalid value.<br>**Atomic service API**: This API can be used in atomic services since API version 12.|
| height<sup>9+</sup>                                 | number                                                       | Yes  | No  | Video height, in px. It can be used as a query parameter when the AVPlayer is in the prepared, playing, paused, or completed state.<br>The value **0** indicates an invalid value.<br>**Atomic service API**: This API can be used in atomic services since API version 12.|

### on('stateChange')<sup>9+</sup>

on(type: 'stateChange', callback: OnAVPlayerStateChangeHandle): void

Subscribes to AVPlayer state changes.

**Atomic service API**: This API can be used in atomic services since API version 11.

**System capability**: SystemCapability.Multimedia.Media.AVPlayer

**Parameters**

| Name  | Type    | Mandatory| Description                                                        |
| -------- | -------- | ---- | ------------------------------------------------------------ |
| type     | string   | Yes  | Event type, which is **'stateChange'** in this case. This event can be triggered by both user operations and the system.|
| callback | [OnAVPlayerStateChangeHandle](#onavplayerstatechangehandle12) | Yes  | Callback invoked when the event is triggered.|

**Example**

```ts
avPlayer.on('stateChange', async (state: string, reason: media.StateChangeReason) => {
  switch (state) {
    case 'idle':
      console.info('state idle called');
      break;
    case 'initialized':
      console.info('initialized prepared called');
      break;
    case 'prepared':
      console.info('state prepared called');
      break;
    case 'playing':
      console.info('state playing called');
      break;
    case 'paused':
      console.info('state paused called');
      break;
    case 'completed':
      console.info('state completed called');
      break;
    case 'stopped':
      console.info('state stopped called');
      break;
    case 'released':
      console.info('state released called');
      break;
    case 'error':
      console.info('state error called');
      break;
    default:
      console.info('unknown state :' + state);
      break;
  }
})
```

### off('stateChange')<sup>9+</sup>

off(type: 'stateChange', callback?: OnAVPlayerStateChangeHandle): void

Unsubscribes from AVPlayer state changes.

**Atomic service API**: This API can be used in atomic services since API version 11.

**System capability**: SystemCapability.Multimedia.Media.AVPlayer

**Parameters**

| Name| Type  | Mandatory| Description                                                 |
| ------ | ------ | ---- | ----------------------------------------------------- |
| type   | string | Yes  | Event type, which is **'stateChange'** in this case.|
| callback   | [OnAVPlayerStateChangeHandle](#onavplayerstatechangehandle12) | No  | Callback invoked when the event is triggered.<br>This parameter is supported since API version 12.|

**Example**

```ts
avPlayer.off('stateChange')
```

### on('error')<sup>9+</sup>

on(type: 'error', callback: ErrorCallback): void

Subscribes to AVPlayer errors. This event is used only for error prompt and does not require the user to stop playback control. If [AVPlayerState](#avplayerstate9) is also switched to error, call [reset()](#reset9) or [release()](#release9) to exit the playback.

**Atomic service API**: This API can be used in atomic services since API version 11.

**System capability**: SystemCapability.Multimedia.Media.AVPlayer

**Parameters**

| Name  | Type    | Mandatory| Description                                                        |
| -------- | -------- | ---- | ------------------------------------------------------------ |
| type     | string   | Yes  | Event type, which is **'error'** in this case. This event can be triggered by both user operations and the system.|
| callback | [ErrorCallback](../apis-basic-services-kit/js-apis-base.md#errorcallback) | Yes  | Callback used to return the error code ID and error message.|

**Error codes**

For details about the error codes, see [Media Error Codes](errorcode-media.md).

In API versions 9 to 13, error code 5400103 is reported when the network or server data flow is abnormal. In API version 14 and later, error codes 5411001 to 5411011 are reported for refined management.

| ID| Error Message             |
| -------- | --------------------- |
| 201      | Permission denied     |
| 401      | The parameter check failed. |
| 801      | Capability not supported. |
| 5400101  | No memory. |
| 5400102  | Operation not allowed.|
| 5400103  | I/O error             |
| 5400104  | Time out              |
| 5400105  | Service died.         |
| 5400106  | Unsupported format.     |
| 5411001  | IO can not find host.    |
| 5411002  | IO connection timeout.  |
| 5411003  | IO network abnormal.     |
| 5411004  | IO network unavailable.  |
| 5411005  | IO no permission.        |
| 5411006  | IO request denied.  |
| 5411007  | IO resource not found. |
| 5411008  | IO SSL client cert needed.    |
| 5411009  | IO SSL connect fail.     |
| 5411010  | IO SSL server cert untrusted.    |
| 5411011  | IO unsupported request.      |

**Example**

```ts
import { BusinessError } from '@kit.BasicServicesKit';

avPlayer.on('error', (error: BusinessError) => {
  console.info('error happened,and error message is :' + error.message)
  console.info('error happened,and error code is :' + error.code)
})
```

### off('error')<sup>9+</sup>

off(type: 'error', callback?: ErrorCallback): void

Unsubscribes from AVPlayer errors.

**Atomic service API**: This API can be used in atomic services since API version 11.

**System capability**: SystemCapability.Multimedia.Media.AVPlayer

**Parameters**

| Name| Type  | Mandatory| Description                                     |
| ------ | ------ | ---- | ----------------------------------------- |
| type   | string | Yes  | Event type, which is **'error'** in this case.|
| callback | [ErrorCallback](../apis-basic-services-kit/js-apis-base.md#errorcallback) | No  | Callback used to return the error code ID and error message.<br>This parameter is supported since API version 12.|

**Example**

```ts
avPlayer.off('error')
```

### setMediaSource<sup>12+</sup>

setMediaSource(src:MediaSource, strategy?: PlaybackStrategy): Promise\<void>

Sets a source of streaming media that can be pre-downloaded, downloads the media data, and temporarily stores the data in the memory. For details about how to use the API, see [Video Playback](../../media/media/video-playback.md) This API uses a promise to return the result.

**Atomic service API**: This API can be used in atomic services since API version 12.

**System capability**: SystemCapability.Multimedia.Media.AVPlayer

**Parameters**

| Name  | Type    | Mandatory| Description                |
| -------- | -------- | ---- | -------------------- |
| src | [MediaSource](#mediasource12) | Yes  | Source of the streaming media to pre-download.|
| strategy | [PlaybackStrategy](#playbackstrategy12) | No  | strategy for playing the pre-downloaded streaming media.|

**Return value**

| Type          | Description                                      |
| -------------- | ------------------------------------------ |
| Promise\<void> | Promise that returns no value.|

**Error codes**

For details about the error codes, see [Media Error Codes](errorcode-media.md).

| ID| Error Message                                 |
| -------- | ----------------------------------------- |
| 401      | Parameter error. Possible causes: 1. Mandatory parameters are left unspecified. 2. Incorrect parameter types. 3.Parameter verification failed.      |
| 5400102  | Operation not allowed. Return by promise. |

**Example**

```ts
let player = await media.createAVPlayer();
let headers: Record<string, string> = {"User-Agent" : "User-Agent-Value"};
let mediaSource : media.MediaSource = media.createMediaSourceWithUrl("http://xxx",  headers);
let playStrategy : media.PlaybackStrategy = {preferredWidth: 1, preferredHeight: 2, preferredBufferDuration: 3, preferredHdr: false};
player.setMediaSource(mediaSource, playStrategy);
```

### setPlaybackStrategy<sup>12+</sup>

setPlaybackStrategy(strategy: PlaybackStrategy): Promise\<void>

Sets a playback strategy. This API can be called only when the AVPlayer is in the initialized state.

**Atomic service API**: This API can be used in atomic services since API version 12.

**System capability**: SystemCapability.Multimedia.Media.AVPlayer

**Parameters**

| Name  | Type    | Mandatory| Description                |
| -------- | -------- | ---- | -------------------- |
| strategy | [PlaybackStrategy](#playbackstrategy12) | Yes  | Playback strategy.|

**Return value**

| Type          | Description                                 |
| -------------- | ------------------------------------ |
| Promise\<void> | Promise that returns no value.|

**Error codes**

For details about the error codes, see [Media Error Codes](errorcode-media.md).

| ID| Error Message                                 |
| -------- | ----------------------------------------- |
| 401      | Parameter error. Possible causes: 1. Incorrect parameter types. 2. Parameter verification failed. |
| 5400102  | Operation not allowed. Return by promise. |

**Example**

```ts
import { common } from '@kit.AbilityKit';

let player = await media.createAVPlayer();
let context = getContext(this) as common.UIAbilityContext
let fileDescriptor = await context.resourceManager.getRawFd('xxx.mp4')
player.fdSrc = fileDescriptor
let playStrategy : media.PlaybackStrategy = {preferredWidth: 1, preferredHeight: 2, preferredBufferDuration: 3,
  preferredHdr: false, mutedMediaType: media.MediaType.MEDIA_TYPE_AUD};
player.setPlaybackStrategy(playStrategy);
```

### prepare<sup>9+</sup>

prepare(callback: AsyncCallback\<void>): void

Prepares for audio and video playback. This API can be called only when the AVPlayer is in the initialized state. The state changes can be detected by subscribing to the [stateChange](#onstatechange9) event. This API uses an asynchronous callback to return the result.

**Atomic service API**: This API can be used in atomic services since API version 11.

**System capability**: SystemCapability.Multimedia.Media.AVPlayer

**Parameters**

| Name  | Type    | Mandatory| Description                |
| -------- | -------- | ---- | -------------------- |
| callback | AsyncCallback\<void> | Yes  | Callback used to return the result.|

**Error codes**

For details about the error codes, see [Media Error Codes](errorcode-media.md).

| ID| Error Message                                  |
| -------- | ------------------------------------------ |
| 5400102  | Operation not allowed. Return by callback. |
| 5400106  | Unsupported format. Return by callback.      |

**Example**

```ts
import { BusinessError } from '@kit.BasicServicesKit';

avPlayer.prepare((err: BusinessError) => {
  if (err) {
    console.error('Failed to prepare,error message is :' + err.message)
  } else {
    console.info('Succeeded in preparing');
  }
})
```

### prepare<sup>9+</sup>

prepare(): Promise\<void>

Prepares for audio and video playback. This API can be called only when the AVPlayer is in the initialized state. The state changes can be detected by subscribing to the [stateChange](#onstatechange9) event. This API uses a promise to return the result.

**Atomic service API**: This API can be used in atomic services since API version 11.

**System capability**: SystemCapability.Multimedia.Media.AVPlayer

**Return value**

| Type          | Description                     |
| -------------- | ------------------------- |
| Promise\<void> | Promise that returns no value.|

**Error codes**

For details about the error codes, see [Media Error Codes](errorcode-media.md).

| ID| Error Message                                 |
| -------- | ----------------------------------------- |
| 5400102  | Operation not allowed. Return by promise. |
| 5400106  | Unsupported format. Return by promise.      |

**Example**

```ts
import { BusinessError } from '@kit.BasicServicesKit';

avPlayer.prepare().then(() => {
  console.info('Succeeded in preparing');
}, (err: BusinessError) => {
  console.error('Failed to prepare,error message is :' + err.message)
})
```

### setMediaMuted<sup>12+</sup>

setMediaMuted(mediaType: MediaType,  muted: boolean ): Promise\<void>

Mutes or unmutes the audio. This API can be called only when the AVPlayer is in the prepared, playing, paused, or completed state. The **mediaType** parameter can be set only to the audio format.

**Atomic service API**: This API can be used in atomic services since API version 12.

**System capability**: SystemCapability.Multimedia.Media.AVPlayer

**Parameters**

| Name  | Type    | Mandatory| Description                |
| -------- | -------- | ---- | -------------------- |
| mediaType | [MediaType](#mediatype8) | Yes  | Media type.|
| muted | boolean | Yes  | Whether to mute the audio.|

**Return value**

| Type          | Description                     |
| -------------- | ------------------------- |
| Promise\<void> | Promise that returns no value.|

**Error codes**

For details about the error codes, see [Media Error Codes](errorcode-media.md).

| ID| Error Message|
| -------- | ----------------------------------------- |
| 401 | The parameter check failed. Return by promise. |
| 5400102 | Operation not allowed. Return by promise. |

**Example**

```ts
import { BusinessError } from '@kit.BasicServicesKit';

avPlayer.prepare().then(() => {
  console.info('Succeeded in preparing');
  avPlayer.setMediaMuted(media.MediaType.MEDIA_TYPE_AUD, true)
}, (err: BusinessError) => {
  console.error('Failed to prepare,error message is :' + err.message)
})
```

### play<sup>9+</sup>

play(callback: AsyncCallback\<void>): void

Starts to play an audio and video asset. This API can be called only when the AVPlayer is in the prepared, paused, or completed state. This API uses an asynchronous callback to return the result.

**Atomic service API**: This API can be used in atomic services since API version 11.

**System capability**: SystemCapability.Multimedia.Media.AVPlayer

**Parameters**

| Name  | Type    | Mandatory| Description                |
| -------- | -------- | ---- | -------------------- |
| callback | AsyncCallback\<void> | Yes  | Callback used to return the result.|

**Error codes**

For details about the error codes, see [Media Error Codes](errorcode-media.md).

| ID| Error Message                                  |
| -------- | ------------------------------------------ |
| 5400102  | Operation not allowed. Return by callback. |

**Example**

```ts
import { BusinessError } from '@kit.BasicServicesKit';

avPlayer.play((err: BusinessError) => {
  if (err) {
    console.error('Failed to play,error message is :' + err.message)
  } else {
    console.info('Succeeded in playing');
  }
})
```

### play<sup>9+</sup>

play(): Promise\<void>

Starts to play an audio and video asset. This API can be called only when the AVPlayer is in the prepared, paused, or completed state. This API uses a promise to return the result.

**Atomic service API**: This API can be used in atomic services since API version 11.

**System capability**: SystemCapability.Multimedia.Media.AVPlayer

**Return value**

| Type          | Description                     |
| -------------- | ------------------------- |
| Promise\<void> | Promise that returns no value.|

**Error codes**

For details about the error codes, see [Media Error Codes](errorcode-media.md).

| ID| Error Message                                 |
| -------- | ----------------------------------------- |
| 5400102  | Operation not allowed. Return by promise. |

**Example**

```ts
import { BusinessError } from '@kit.BasicServicesKit';

avPlayer.play().then(() => {
  console.info('Succeeded in playing');
}, (err: BusinessError) => {
  console.error('Failed to play,error message is :' + err.message)
})
```

### pause<sup>9+</sup>

pause(callback: AsyncCallback\<void>): void

Pauses audio and video playback. This API can be called only when the AVPlayer is in the playing state. This API uses an asynchronous callback to return the result.

**Atomic service API**: This API can be used in atomic services since API version 11.

**System capability**: SystemCapability.Multimedia.Media.AVPlayer

**Parameters**

| Name  | Type    | Mandatory| Description                |
| -------- | -------- | ---- | -------------------- |
| callback | AsyncCallback\<void> | Yes  | Callback used to return the result.|

**Error codes**

For details about the error codes, see [Media Error Codes](errorcode-media.md).

| ID| Error Message                                  |
| -------- | ------------------------------------------ |
| 5400102  | Operation not allowed. Return by callback. |

**Example**

```ts
import { BusinessError } from '@kit.BasicServicesKit';

avPlayer.pause((err: BusinessError) => {
  if (err) {
    console.error('Failed to pause,error message is :' + err.message)
  } else {
    console.info('Succeeded in pausing');
  }
})
```

### pause<sup>9+</sup>

pause(): Promise\<void>

Pauses audio and video playback. This API can be called only when the AVPlayer is in the playing state. This API uses a promise to return the result.

**Atomic service API**: This API can be used in atomic services since API version 11.

**System capability**: SystemCapability.Multimedia.Media.AVPlayer

**Return value**

| Type          | Description                     |
| -------------- | ------------------------- |
| Promise\<void> | Promise that returns no value.|

**Error codes**

For details about the error codes, see [Media Error Codes](errorcode-media.md).

| ID| Error Message                                 |
| -------- | ----------------------------------------- |
| 5400102  | Operation not allowed. Return by promise. |

**Example**

```ts
import { BusinessError } from '@kit.BasicServicesKit';

avPlayer.pause().then(() => {
  console.info('Succeeded in pausing');
}, (err: BusinessError) => {
  console.error('Failed to pause,error message is :' + err.message)
})
```

### stop<sup>9+</sup>

stop(callback: AsyncCallback\<void>): void

Stops audio and video playback. This API can be called only when the AVPlayer is in the prepared, playing, paused, or completed state. This API uses an asynchronous callback to return the result.

**Atomic service API**: This API can be used in atomic services since API version 11.

**System capability**: SystemCapability.Multimedia.Media.AVPlayer

**Parameters**

| Name  | Type    | Mandatory| Description                |
| -------- | -------- | ---- | -------------------- |
| callback | AsyncCallback\<void> | Yes  | Callback used to return the result.|

**Error codes**

For details about the error codes, see [Media Error Codes](errorcode-media.md).

| ID| Error Message                                  |
| -------- | ------------------------------------------ |
| 5400102  | Operation not allowed. Return by callback. |

**Example**

```ts
import { BusinessError } from '@kit.BasicServicesKit';

avPlayer.stop((err: BusinessError) => {
  if (err) {
    console.error('Failed to stop,error message is :' + err.message)
  } else {
    console.info('Succeeded in stopping');
  }
})
```

### stop<sup>9+</sup>

stop(): Promise\<void>

Stops audio and video playback. This API can be called only when the AVPlayer is in the prepared, playing, paused, or completed state. This API uses a promise to return the result.

**Atomic service API**: This API can be used in atomic services since API version 11.

**System capability**: SystemCapability.Multimedia.Media.AVPlayer

**Return value**

| Type          | Description                     |
| -------------- | ------------------------- |
| Promise\<void> | Promise that returns no value.|

**Error codes**

For details about the error codes, see [Media Error Codes](errorcode-media.md).

| ID| Error Message                                 |
| -------- | ----------------------------------------- |
| 5400102  | Operation not allowed. Return by promise. |

**Example**

```ts
import { BusinessError } from '@kit.BasicServicesKit';

avPlayer.stop().then(() => {
  console.info('Succeeded in stopping');
}, (err: BusinessError) => {
  console.error('Failed to stop,error message is :' + err.message)
})
```

### reset<sup>9+</sup>

reset(callback: AsyncCallback\<void>): void

Resets audio and video playback. This API can be called only when the AVPlayer is in the initialized, prepared, playing, paused, completed, stopped, or error state. This API uses an asynchronous callback to return the result.

**Atomic service API**: This API can be used in atomic services since API version 11.

**System capability**: SystemCapability.Multimedia.Media.AVPlayer

**Parameters**

| Name  | Type    | Mandatory| Description                |
| -------- | -------- | ---- | -------------------- |
| callback | AsyncCallback\<void> | Yes  | Callback used to return the result.|

**Error codes**

For details about the error codes, see [Media Error Codes](errorcode-media.md).

| ID| Error Message                                  |
| -------- | ------------------------------------------ |
| 5400102  | Operation not allowed. Return by callback. |

**Example**

```ts
import { BusinessError } from '@kit.BasicServicesKit';

avPlayer.reset((err: BusinessError) => {
  if (err) {
    console.error('Failed to reset,error message is :' + err.message)
  } else {
    console.info('Succeeded in resetting');
  }
})
```

### reset<sup>9+</sup>

reset(): Promise\<void>

Resets audio and video playback. This API can be called only when the AVPlayer is in the initialized, prepared, playing, paused, completed, stopped, or error state. This API uses a promise to return the result.

**Atomic service API**: This API can be used in atomic services since API version 11.

**System capability**: SystemCapability.Multimedia.Media.AVPlayer

**Return value**

| Type          | Description                     |
| -------------- | ------------------------- |
| Promise\<void> | Promise that returns no value.|

**Error codes**

For details about the error codes, see [Media Error Codes](errorcode-media.md).

| ID| Error Message                                 |
| -------- | ----------------------------------------- |
| 5400102  | Operation not allowed. Return by promise. |

**Example**

```ts
import { BusinessError } from '@kit.BasicServicesKit';

avPlayer.reset().then(() => {
  console.info('Succeeded in resetting');
}, (err: BusinessError) => {
  console.error('Failed to reset,error message is :' + err.message)
})
```

### release<sup>9+</sup>

release(callback: AsyncCallback\<void>): void

Releases the playback resources. This API can be called when the AVPlayer is in any state except released. This API uses an asynchronous callback to return the result.

**Atomic service API**: This API can be used in atomic services since API version 11.

**System capability**: SystemCapability.Multimedia.Media.AVPlayer

**Parameters**

| Name  | Type    | Mandatory| Description                |
| -------- | -------- | ---- | -------------------- |
| callback | AsyncCallback\<void> | Yes  | Callback used to return the result.|

**Error codes**

For details about the error codes, see [Media Error Codes](errorcode-media.md).

| ID| Error Message                                  |
| -------- | ------------------------------------------ |
| 5400102  | Operation not allowed. Return by callback. |

**Example**

```ts
import { BusinessError } from '@kit.BasicServicesKit';

avPlayer.release((err: BusinessError) => {
  if (err) {
    console.error('Failed to release,error message is :' + err.message)
  } else {
    console.info('Succeeded in releasing');
  }
})
```

### release<sup>9+</sup>

release(): Promise\<void>

Releases the playback resources. This API can be called when the AVPlayer is in any state except released. This API uses a promise to return the result.

**Atomic service API**: This API can be used in atomic services since API version 11.

**System capability**: SystemCapability.Multimedia.Media.AVPlayer

**Return value**

| Type          | Description                     |
| -------------- | ------------------------- |
| Promise\<void> | Promise that returns no value.|

**Error codes**

For details about the error codes, see [Media Error Codes](errorcode-media.md).

| ID| Error Message                                 |
| -------- | ----------------------------------------- |
| 5400102  | Operation not allowed. Return by promise. |

**Example**

```ts
import { BusinessError } from '@kit.BasicServicesKit';

avPlayer.release().then(() => {
  console.info('Succeeded in releasing');
}, (err: BusinessError) => {
  console.error('Failed to release,error message is :' + err.message)
})
```

### getTrackDescription<sup>9+</sup>

getTrackDescription(callback: AsyncCallback\<Array\<MediaDescription>>): void

Obtains the audio and video track information. This API can be called only when the AVPlayer is in the prepared, playing, or paused state. To obtain information about all audio and video tracks, this API must be called after the data loading callback is triggered. This API uses an asynchronous callback to return the result.

**Atomic service API**: This API can be used in atomic services since API version 11.

**System capability**: SystemCapability.Multimedia.Media.AVPlayer

**Parameters**

| Name  | Type                                                        | Mandatory| Description                                        |
| -------- | ------------------------------------------------------------ | ---- | -------------------------------------------- |
| callback | AsyncCallback<Array<[MediaDescription](#mediadescription8)>> | Yes  | Callback used to return the result. If the operation is successful, **err** is **undefined** and **data** is the MediaDescription array obtained; otherwise, **err** is an error object.|

**Error codes**

For details about the error codes, see [Media Error Codes](errorcode-media.md).

| ID| Error Message                                  |
| -------- | ------------------------------------------ |
| 5400102  | Operation not allowed. Return by callback. |

**Example**

```ts
import { BusinessError } from '@kit.BasicServicesKit';

avPlayer.getTrackDescription((error: BusinessError, arrList: Array<media.MediaDescription>) => {
  if ((arrList) != null) {
    console.info('Succeeded in doing getTrackDescription');
  } else {
    console.error(`Failed to do getTrackDescription, error:${error}`);
  }
});
```

### getTrackDescription<sup>9+</sup>

getTrackDescription(): Promise\<Array\<MediaDescription>>

Obtains the audio and video track information. This API can be called only when the AVPlayer is in the prepared, playing, or paused state. This API uses a promise to return the result.

**Atomic service API**: This API can be used in atomic services since API version 11.

**System capability**: SystemCapability.Multimedia.Media.AVPlayer

**Return value**

| Type                                                  | Description                                             |
| ------------------------------------------------------ | ------------------------------------------------- |
| Promise<Array<[MediaDescription](#mediadescription8)>> | Promise used to return the MediaDescription array that holds the audio and video track information.|

**Error codes**

For details about the error codes, see [Media Error Codes](errorcode-media.md).

| ID| Error Message                                 |
| -------- | ----------------------------------------- |
| 5400102  | Operation not allowed. Return by promise. |

**Example**

```ts
import { BusinessError } from '@kit.BasicServicesKit';

avPlayer.getTrackDescription().then((arrList: Array<media.MediaDescription>) => {
  console.info('Succeeded in getting TrackDescription');
}).catch((error: BusinessError) => {
  console.error(`Failed to get TrackDescription, error:${error}`);
});
```

### getSelectedTracks<sup>12+</sup>

getSelectedTracks(): Promise\<Array\<number>>

Obtains the indexes of the selected audio or video tracks. This API can be called only when the AVPlayer is in the prepared, playing, or paused state. This API uses a promise to return the result.

**Atomic service API**: This API can be used in atomic services since API version 12.

**System capability**: SystemCapability.Multimedia.Media.AVPlayer

**Return value**

| Type                                                  | Description                                             |
| ------------------------------------------------------ | ------------------------------------------------- |
| Promise<Array<[number]>> | Promise used to return the index array.|

**Error codes**

For details about the error codes, see [Media Error Codes](errorcode-media.md).

| ID| Error Message                                 |
| -------- | ----------------------------------------- |
| 5400102  | Operation not allowed. |

**Example**

```ts
import { BusinessError } from '@kit.BasicServicesKit';

avPlayer.getSelectedTracks().then((arrList: Array<number>) => {
  console.info('Succeeded in getting SelectedTracks');
}).catch((error: BusinessError) => {
  console.error(`Failed to get SelectedTracks, error:${error}`);
});
```

### getPlaybackInfo<sup>12+</sup>

getPlaybackInfo(): Promise\<PlaybackInfo>

Obtains the playback information. This API can be called only when the AVPlayer is in the prepared, playing, or paused state. This API uses a promise to return the result.

**System capability**: SystemCapability.Multimedia.Media.AVPlayer

**Return value**

| Type                                                  | Description                                             |
| ------------------------------------------------------ | ------------------------------------------------- |
| Promise<[PlaybackInfo](#playbackinfo12)> | Promise used to return **PlaybackInfo**.|

**Example**

```ts
import { BusinessError } from '@kit.BasicServicesKit';

let avPlayer: media.AVPlayer | undefined = undefined;
let playbackInfo: media.PlaybackInfo | undefined = undefined;
media.createAVPlayer(async (err: BusinessError, player: media.AVPlayer) => {
  if (player != null) {
    avPlayer = player;
    console.info(`Succeeded in creating AVPlayer`);
    if (avPlayer) {
      try {
        playbackInfo = await avPlayer.getPlaybackInfo();
        console.info(`AVPlayer getPlaybackInfo = ${JSON.stringify(playbackInfo)}`); // Print PlaybackInfo.
      } catch (error) {
        console.error(`error = ${error}`);
      }
    }
  } else {
    console.error(`Failed to create AVPlayer, error message:${err.message}`);
  }
});
```

### selectTrack<sup>12+</sup>

selectTrack(index: number, mode?: SwitchMode): Promise\<void>

Selects a track when the AVPlayer is used to play a resource with multiple audio and video tracks. This API uses a promise to return the result.

**Atomic service API**: This API can be used in atomic services since API version 12.

**System capability**: SystemCapability.Multimedia.Media.AVPlayer

**Parameters**

| Name  | Type    | Mandatory| Description                |
| -------- | -------- | ---- | -------------------- |
| index | number | Yes  | Index of the track. You can call [getTrackDescription](#gettrackdescription9-1) to obtain all track information [MediaDescription](#mediadescription8) of the current resource.|
| mode   | [SwitchMode](#switchmode12) | No  | Video track switch mode. The default mode is **SMOOTH**. This parameter takes effect only for the switch of a video track for DASH streams.|

**Return value**

| Type          | Description                     |
| -------------- | ------------------------- |
| Promise\<void> | Promise that returns no value.|

**Error codes**

For details about the error codes, see [Media Error Codes](errorcode-media.md).

| ID| Error Message                                 |
| -------- | ----------------------------------------- |
| 401      | The parameter check failed. Return by promise.       |
| 5400102  | Operation not allowed. Return by promise. |

**Example**

```ts
import { BusinessError } from '@kit.BasicServicesKit';

let avPlayer: media.AVPlayer = await media.createAVPlayer();
let audioTrackIndex: Object = 0;
avPlayer.getTrackDescription((error: BusinessError, arrList: Array<media.MediaDescription>) => {
  if (arrList != null) {
    for (let i = 0; i < arrList.length; i++) {
      if (i != 0) {
        // Obtain the audio track list.
        audioTrackIndex = arrList[i][media.MediaDescriptionKey.MD_KEY_TRACK_INDEX];
      }
    }
  } else {
    console.error(`Failed to get TrackDescription, error:${error}`);
  }
});

// Select an audio track.
avPlayer.selectTrack(parseInt(audioTrackIndex.toString()));
```

### deselectTrack<sup>12+</sup>

deselectTrack(index: number): Promise\<void>

Deselects a track when the AVPlayer is used to play a resource with multiple audio and video tracks. This API uses a promise to return the result.

**Atomic service API**: This API can be used in atomic services since API version 12.

**System capability**: SystemCapability.Multimedia.Media.AVPlayer

**Parameters**

| Name  | Type    | Mandatory| Description                |
| -------- | -------- | ---- | -------------------- |
| index | number | Yes  | Track index, which is obtained from [MediaDescription](#mediadescription8) by calling [getTrackDescription](#gettrackdescription9-1).|

**Return value**

| Type          | Description                     |
| -------------- | ------------------------- |
| Promise\<void> | Promise that returns no value.|

**Error codes**

For details about the error codes, see [Media Error Codes](errorcode-media.md).

| ID| Error Message                                 |
| -------- | ----------------------------------------- |
| 401      | The parameter check failed. Return by promise.       |
| 5400102  | Operation not allowed. Return by promise. |

**Example**

```ts
import { BusinessError } from '@kit.BasicServicesKit';

let avPlayer: media.AVPlayer = await media.createAVPlayer();
let audioTrackIndex: Object = 0;
avPlayer.getTrackDescription((error: BusinessError, arrList: Array<media.MediaDescription>) => {
  if (arrList != null) {
    for (let i = 0; i < arrList.length; i++) {
      if (i != 0) {
        // Obtain the audio track list.
        audioTrackIndex = arrList[i][media.MediaDescriptionKey.MD_KEY_TRACK_INDEX];
      }
    }
  } else {
    console.error(`Failed to get TrackDescription, error:${error}`);
  }
});

// Select an audio track.
avPlayer.selectTrack(parseInt(audioTrackIndex.toString()));
// Deselect the audio track and restore to the default audio track.
avPlayer.deselectTrack(parseInt(audioTrackIndex.toString()));
```

### setDecryptionConfig<sup>11+</sup>

setDecryptionConfig(mediaKeySession: drm.MediaKeySession, secureVideoPath: boolean): void

Sets the decryption configuration. When receiving a [mediaKeySystemInfoUpdate event](#onmediakeysysteminfoupdate11), create the related configuration and set the decryption configuration based on the information in the reported event. Otherwise, the playback fails.

**Atomic service API**: This API can be used in atomic services since API version 12.

**System capability**: SystemCapability.Multimedia.Media.AVPlayer

**Parameters**

| Name  | Type                                                        | Mandatory| Description                                        |
| -------- | ------------------------------------------------------------ | ---- | -------------------------------------------- |
| mediaKeySession | [drm.MediaKeySession](../apis-drm-kit/js-apis-drm.md#mediakeysession) | Yes  | Decryption session.|
| secureVideoPath | boolean | Yes| Secure video channel. The value **true** means that a secure video channel is selected, and **false** means that a non-secure video channel is selected.|

**Error codes**

For details about the error codes, see [Media Error Codes](errorcode-media.md).

| ID| Error Message                                 |
| -------- | ----------------------------------------- |
| 401  | Parameter error. Possible causes: 1. Mandatory parameters are left unspecified. 2. Incorrect parameter types. 3.Parameter verification failed. |

**Example**

For details about the DRM module, see [js-apis-drm.md](../apis-drm-kit/js-apis-drm.md).
```ts
import { drm } from '@kit.DrmKit';

// Create a media key system.
let keySystem:drm.MediaKeySystem = drm.createMediaKeySystem('com.clearplay.drm');
// Create a media key session.
let keySession:drm.MediaKeySession = keySystem.createMediaKeySession(drm.ContentProtectionLevel.CONTENT_PROTECTION_LEVEL_SW_CRYPTO);
// Generate a media key request and set the response to the media key request.
// Flag indicating whether a secure video channel is used.
let secureVideoPath:boolean = false;
// Set the decryption configuration.
avPlayer.setDecryptionConfig(keySession, secureVideoPath);
```

### getMediaKeySystemInfos<sup>11+</sup>

getMediaKeySystemInfos(): Array\<drm.MediaKeySystemInfo>

Obtains the media key system information of the media asset that is being played. This API must be called after the [mediaKeySystemInfoUpdate event](#onmediakeysysteminfoupdate11) is triggered.

**Atomic service API**: This API can be used in atomic services since API version 12.

**System capability**: SystemCapability.Multimedia.Media.AVPlayer

**Return value**

| Type                                                  | Description                                             |
| ------------------------------------------------------ | ------------------------------------------------- |
|  Array<[drm.MediaKeySystemInfo](../apis-drm-kit/js-apis-drm.md#mediakeysysteminfo)> | Array of **MediaKeySystemInfo** objects, each of which contains the **uuid** and **pssh** attributes.|

**Example**

```ts
import { drm } from '@kit.DrmKit';

const infos = avPlayer.getMediaKeySystemInfos();
console.info('GetMediaKeySystemInfos count: ' + infos.length);
for (let i = 0; i < infos.length; i++) {
  console.info('GetMediaKeySystemInfos uuid: ' + infos[i]["uuid"]);
  console.info('GetMediaKeySystemInfos pssh: ' + infos[i]["pssh"]);
}
```

### seek<sup>9+</sup>

seek(timeMs: number, mode?:SeekMode): void

Seeks to the specified playback position. This API can be called only when the AVPlayer is in the prepared, playing, paused, or completed state. You can check whether the seek operation takes effect by subscribing to the [seekDone](#onseekdone9) event.
This API is not supported in live mode.

**Atomic service API**: This API can be used in atomic services since API version 11.

**System capability**: SystemCapability.Multimedia.Media.AVPlayer

**Parameters**

| Name| Type                  | Mandatory| Description                                                        |
| ------ | ---------------------- | ---- | ------------------------------------------------------------ |
| timeMs | number                 | Yes  | Position to seek to, in ms. The value range is [0, [duration](#attributes)].|
| mode   | [SeekMode](#seekmode8) | No  | Seek mode based on the video I frame. The default value is **SEEK_PREV_SYNC**. **Set this parameter only for video playback.**|

**Example**

```ts
let seekTime: number = 1000
avPlayer.seek(seekTime, media.SeekMode.SEEK_PREV_SYNC)
```

### on('seekDone')<sup>9+</sup>

on(type: 'seekDone', callback: Callback\<number>): void

Subscribes to the event to check whether the seek operation takes effect.

**System capability**: SystemCapability.Multimedia.Media.AVPlayer

**Atomic service API**: This API can be used in atomic services since API version 11.

**Parameters**

| Name  | Type    | Mandatory| Description                                                        |
| -------- | -------- | ---- | ------------------------------------------------------------ |
| type     | string   | Yes  | Event type, which is **'seekDone'** in this case. This event is triggered each time **seek()** is called.|
| callback | Callback\<number> | Yes  | Callback invoked when the event is triggered. It reports the time position requested by the user.<br>For video playback, [SeekMode](#seekmode8) may cause the actual position to be different from that requested by the user. The exact position can be obtained from the **currentTime** attribute. The time in this callback only means that the requested seek operation is complete.|

**Example**

```ts
avPlayer.on('seekDone', (seekDoneTime:number) => {
  console.info('seekDone called,and seek time is:' + seekDoneTime)
})
```

### off('seekDone')<sup>9+</sup>

off(type: 'seekDone', callback?: Callback\<number>): void

Unsubscribes from the event that checks whether the seek operation takes effect.

**Atomic service API**: This API can be used in atomic services since API version 11.

**System capability**: SystemCapability.Multimedia.Media.AVPlayer

**Parameters**

| Name| Type  | Mandatory| Description                                                |
| ------ | ------ | ---- | ---------------------------------------------------- |
| type   | string | Yes  | Event type, which is **'seekDone'** in this case.|
| callback | Callback\<number> | No  | Callback invoked when the event is triggered. It reports the time position requested by the user.<br>For video playback, [SeekMode](#seekmode8) may cause the actual position to be different from that requested by the user. The exact position can be obtained from the **currentTime** attribute. The time in this callback only means that the requested seek operation is complete.<br>This parameter is supported since API version 12.|

**Example**

```ts
avPlayer.off('seekDone')
```

### setSpeed<sup>9+</sup>

setSpeed(speed: PlaybackSpeed): void

Sets the playback speed. This API can be called only when the AVPlayer is in the prepared, playing, paused, or completed state. You can check whether the setting takes effect by subscribing to the [speedDone](#onspeeddone9) event.
This API is not supported in live mode.

**Atomic service API**: This API can be used in atomic services since API version 12.

**System capability**: SystemCapability.Multimedia.Media.AVPlayer

**Parameters**

| Name| Type                            | Mandatory| Description              |
| ------ | -------------------------------- | ---- | ------------------ |
| speed  | [PlaybackSpeed](#playbackspeed8) | Yes  | Playback speed to set.|

**Example**

```ts
avPlayer.setSpeed(media.PlaybackSpeed.SPEED_FORWARD_2_00_X)
```

### on('speedDone')<sup>9+</sup>

on(type: 'speedDone', callback: Callback\<number>): void

Subscribes to the event to check whether the playback speed is successfully set.

**Atomic service API**: This API can be used in atomic services since API version 12.

**System capability**: SystemCapability.Multimedia.Media.AVPlayer

**Parameters**

| Name  | Type    | Mandatory| Description                                                        |
| -------- | -------- | ---- | ------------------------------------------------------------ |
| type     | string   | Yes  | Event type, which is **'speedDone'** in this case. This event is triggered each time **setSpeed()** is called.|
| callback | Callback\<number> | Yes  | Callback used to return the result. When the call of **setSpeed** is successful, the effective speed mode is reported. For details, see [PlaybackSpeed](#playbackspeed8).|

**Example**

```ts
avPlayer.on('speedDone', (speed:number) => {
  console.info('speedDone called,and speed value is:' + speed)
})
```

### off('speedDone')<sup>9+</sup>

off(type: 'speedDone', callback?: Callback\<number>): void

Unsubscribes from the event that checks whether the playback speed is successfully set.

**System capability**: SystemCapability.Multimedia.Media.AVPlayer

**Parameters**

| Name| Type  | Mandatory| Description                                                     |
| ------ | ------ | ---- | --------------------------------------------------------- |
| type   | string | Yes  | Event type, which is **'speedDone'** in this case.|
| callback | Callback\<number> | No  | Callback used to return the result. When the call of **setSpeed** is successful, the effective speed mode is reported. For details, see [PlaybackSpeed](#playbackspeed8).<br>This parameter is supported since API version 12.|

**Example**

```ts
avPlayer.off('speedDone')
```

### setBitrate<sup>9+</sup>

setBitrate(bitrate: number): void

Sets the bit rate for the streaming media. This API is valid only for HLS/DASH streams. By default, the AVPlayer selects a proper bit rate based on the network connection speed. This API can be called only when the AVPlayer is in the prepared, playing, paused, or completed state. You can check whether the setting takes effect by subscribing to the [bitrateDone](#onbitratedone9) event.

**Atomic service API**: This API can be used in atomic services since API version 12.

**System capability**: SystemCapability.Multimedia.Media.AVPlayer

**Parameters**

| Name | Type  | Mandatory| Description                                                        |
| ------- | ------ | ---- | ------------------------------------------------------------ |
| bitrate | number | Yes  | Bit rate to set. You can obtain the available bit rates of the current HLS/DASH stream by subscribing to the [availableBitrates](#onavailablebitrates9) event. If the bit rate to set is not in the list of the available bit rates, the AVPlayer selects from the list the bit rate that is closed to the bit rate to set. If the length of the available bit rate list obtained through the event is 0, no bit rate can be set and the **bitrateDone** callback will not be triggered.|

**Example**

```ts
let bitrate: number = 96000
avPlayer.setBitrate(bitrate)
```

### on('bitrateDone')<sup>9+</sup>

on(type: 'bitrateDone', callback: Callback\<number>): void

Subscribes to the event to check whether the bit rate is successfully set.

**Atomic service API**: This API can be used in atomic services since API version 12.

**System capability**: SystemCapability.Multimedia.Media.AVPlayer

**Parameters**

| Name  | Type    | Mandatory| Description                                                        |
| -------- | -------- | ---- | ------------------------------------------------------------ |
| type     | string   | Yes  | Event type, which is **'bitrateDone'** in this case. This event is triggered each time **setBitrate()** is called.|
| callback | Callback\<number> | Yes  | Callback invoked when the event is triggered. It reports the effective bit rate.            |

**Example**

```ts
avPlayer.on('bitrateDone', (bitrate:number) => {
  console.info('bitrateDone called,and bitrate value is:' + bitrate)
})
```

### off('bitrateDone')<sup>9+</sup>

off(type: 'bitrateDone', callback?: Callback\<number>): void

Unsubscribes from the event that checks whether the bit rate is successfully set.

**System capability**: SystemCapability.Multimedia.Media.AVPlayer

**Parameters**

| Name| Type  | Mandatory| Description                                                        |
| ------ | ------ | ---- | ------------------------------------------------------------ |
| type   | string | Yes  | Event type, which is **'bitrateDone'** in this case.|
| callback | Callback\<number> | No  | Callback invoked when the event is triggered. It reports the effective bit rate.<br>This parameter is supported since API version 12.            |

**Example**

```ts
avPlayer.off('bitrateDone')
```

### on('availableBitrates')<sup>9+</sup>

on(type: 'availableBitrates', callback: Callback\<Array\<number>>): void

Subscribes to available bit rates of HLS/DASH streams. This event is reported only after the AVPlayer switches to the prepared state.

**Atomic service API**: This API can be used in atomic services since API version 12.

**System capability**: SystemCapability.Multimedia.Media.AVPlayer

**Parameters**

| Name  | Type    | Mandatory| Description                                                        |
| -------- | -------- | ---- | ------------------------------------------------------------ |
| type     | string   | Yes  | Event type, which is **'availableBitrates'** in this case. This event is triggered once after the AVPlayer switches to the prepared state.|
| callback | Callback\<Array\<number>> | Yes  | Callback invoked when the event is triggered. It returns an array that holds the available bit rates. If the array length is 0, no bit rate can be set.|

**Example**

```ts
avPlayer.on('availableBitrates', (bitrates: Array<number>) => {
  console.info('availableBitrates called,and availableBitrates length is:' + bitrates.length)
})
```

### off('availableBitrates')<sup>9+</sup>

off(type: 'availableBitrates', callback?: Callback\<Array\<number>>): void

Unsubscribes from available bit rates of HLS/DASH streams. This event is reported after [prepare](#prepare9) is called.

**Atomic service API**: This API can be used in atomic services since API version 12.

**System capability**: SystemCapability.Multimedia.Media.AVPlayer

**Parameters**

| Name| Type  | Mandatory| Description                                                        |
| ------ | ------ | ---- | ------------------------------------------------------------ |
| type   | string | Yes  | Event type, which is **'availableBitrates'** in this case.|
| callback | Callback\<Array\<number>> | No  | Callback invoked when the event is triggered. It returns an array that holds the available bit rates. If the array length is 0, no bit rate can be set.<br>This parameter is supported since API version 12.|

**Example**

```ts
avPlayer.off('availableBitrates')
```


### on('mediaKeySystemInfoUpdate')<sup>11+</sup>

on(type: 'mediaKeySystemInfoUpdate', callback: Callback\<Array\<drm.MediaKeySystemInfo>>): void

Subscribes to media key system information changes.

**Atomic service API**: This API can be used in atomic services since API version 12.

**System capability**: SystemCapability.Multimedia.Media.AVPlayer

**Parameters**

| Name  | Type    | Mandatory| Description                                                        |
| -------- | -------- | ---- | ------------------------------------------------------------ |
| type     | string   | Yes  | Event type, which is **'mediaKeySystemInfoUpdate'** in this case. This event is triggered when the copyright protection information of the media asset being played changes.|
| callback | Callback\<Array\<drm.[MediaKeySystemInfo](../apis-drm-kit/js-apis-drm.md#mediakeysysteminfo)>> | Yes  | Callback invoked when the event is triggered. It reports a **MediaKeySystemInfo** array.|

**Example**

```ts
import { drm } from '@kit.DrmKit';

avPlayer.on('mediaKeySystemInfoUpdate', (mediaKeySystemInfo: Array<drm.MediaKeySystemInfo>) => {
    for (let i = 0; i < mediaKeySystemInfo.length; i++) {
      console.info('mediaKeySystemInfoUpdate happened uuid: ' + mediaKeySystemInfo[i]["uuid"]);
      console.info('mediaKeySystemInfoUpdate happened pssh: ' + mediaKeySystemInfo[i]["pssh"]);
    }
})
```

### off('mediaKeySystemInfoUpdate')<sup>11+</sup>

off(type: 'mediaKeySystemInfoUpdate', callback?: Callback\<Array\<drm.MediaKeySystemInfo>>): void;

Unsubscribes from media key system information changes.

**Atomic service API**: This API can be used in atomic services since API version 12.

**System capability**: SystemCapability.Multimedia.Media.AVPlayer

**Parameters**

| Name| Type  | Mandatory| Description                                                        |
| ------ | ------ | ---- | ------------------------------------------------------------ |
| type   | string | Yes  | Event type, which is **'mediaKeySystemInfoUpdate'** in this case.|
| callback | Callback\<Array\<drm.[MediaKeySystemInfo](../apis-drm-kit/js-apis-drm.md#mediakeysysteminfo)>> | No  | Callback invoked when the event is triggered. It reports a **MediaKeySystemInfo** array. If this parameter is specified, only the specified callback is unregistered. Otherwise, all callbacks associated with the specified event will be unregistered.|

**Example**

```ts
avPlayer.off('mediaKeySystemInfoUpdate')
```

### setVolume<sup>9+</sup>

setVolume(volume: number): void

Sets the volume. This API can be called only when the AVPlayer is in the prepared, playing, paused, or completed state. You can check whether the setting takes effect by subscribing to the [volumeChange](#onvolumechange9) event.

**Atomic service API**: This API can be used in atomic services since API version 12.

**System capability**: SystemCapability.Multimedia.Media.AVPlayer

**Parameters**

| Name| Type  | Mandatory| Description                                                        |
| ------ | ------ | ---- | ------------------------------------------------------------ |
| volume | number | Yes  | Relative volume. The value ranges from 0.00 to 1.00. The value **1.00** indicates the maximum volume (100%).|

**Example**

```ts
let volume: number = 1.0
avPlayer.setVolume(volume)
```

### on('volumeChange')<sup>9+</sup>

on(type: 'volumeChange', callback: Callback\<number>): void

Subscribes to the event to check whether the volume is successfully set.

**Atomic service API**: This API can be used in atomic services since API version 12.

**System capability**: SystemCapability.Multimedia.Media.AVPlayer

**Parameters**

| Name  | Type    | Mandatory| Description                                                        |
| -------- | -------- | ---- | ------------------------------------------------------------ |
| type     | string   | Yes  | Event type, which is **'volumeChange'** in this case. This event is triggered each time **setVolume()** is called.|
| callback | Callback\<number> | Yes  | Callback invoked when the event is triggered. It reports the effective volume.           |

**Example**

```ts
avPlayer.on('volumeChange', (vol: number) => {
  console.info('volumeChange called,and new volume is :' + vol)
})
```

### off('volumeChange')<sup>9+</sup>

off(type: 'volumeChange', callback?: Callback\<number>): void

Unsubscribes from the event that checks whether the volume is successfully set.

**System capability**: SystemCapability.Multimedia.Media.AVPlayer

**Parameters**

| Name| Type  | Mandatory| Description                                                        |
| ------ | ------ | ---- | ------------------------------------------------------------ |
| type   | string | Yes  | Event type, which is **'volumeChange'** in this case.|
| callback | Callback\<number> | No  | Callback invoked when the event is triggered. It reports the effective volume.<br>This parameter is supported since API version 12.           |

**Example**

```ts
avPlayer.off('volumeChange')
```

### on('endOfStream')<sup>9+</sup>

on(type: 'endOfStream', callback: Callback\<void>): void

Subscribes to the event that indicates the end of the stream being played. If **[loop](#attributes) = true** is set, the AVPlayer seeks to the beginning of the stream and plays the stream again. If **loop** is not set, the completed state is reported through the [stateChange](#onstatechange9) event.

**Atomic service API**: This API can be used in atomic services since API version 12.

**System capability**: SystemCapability.Multimedia.Media.AVPlayer

**Parameters**

| Name  | Type    | Mandatory| Description                                                        |
| -------- | -------- | ---- | ------------------------------------------------------------ |
| type     | string   | Yes  | Event type, which is **'endOfStream'** in this case. This event is triggered when the AVPlayer finishes playing the media asset.|
| callback | Callback\<void> | Yes  | Callback invoked when the event is triggered.                              |

**Example**

```ts
avPlayer.on('endOfStream', () => {
  console.info('endOfStream called')
})
```

### off('endOfStream')<sup>9+</sup>

off(type: 'endOfStream', callback?: Callback\<void>): void

Unsubscribes from the event that indicates the end of the stream being played.

**System capability**: SystemCapability.Multimedia.Media.AVPlayer

**Parameters**

| Name| Type  | Mandatory| Description                                                        |
| ------ | ------ | ---- | ------------------------------------------------------------ |
| type   | string | Yes  | Event type, which is **'endOfStream'** in this case.|
| callback | Callback\<void> | No  | Callback invoked when the event is triggered.<br>This parameter is supported since API version 12.                              |

**Example**

```ts
avPlayer.off('endOfStream')
```

### on('timeUpdate')<sup>9+</sup>

on(type: 'timeUpdate', callback: Callback\<number>): void

Subscribes to playback position changes. It is used to refresh the current position of the progress bar. By default, this event is reported every 100 ms. However, it is reported immediately upon a successful seek operation.

The **'timeUpdate'** event is not supported in live mode.

**Atomic service API**: This API can be used in atomic services since API version 11.

**System capability**: SystemCapability.Multimedia.Media.AVPlayer

**Parameters**

| Name  | Type    | Mandatory| Description                                          |
| -------- | -------- | ---- | ---------------------------------------------- |
| type     | string   | Yes  | Event type, which is **'timeUpdate'** in this case.|
| callback | Callback\<number> | Yes  | Callback used to return the current time.                                    |

**Example**

```ts
avPlayer.on('timeUpdate', (time:number) => {
  console.info('timeUpdate called,and new time is :' + time)
})
```

### off('timeUpdate')<sup>9+</sup>

off(type: 'timeUpdate', callback?: Callback\<number>): void

Unsubscribes from playback position changes.

**Atomic service API**: This API can be used in atomic services since API version 11.

**System capability**: SystemCapability.Multimedia.Media.AVPlayer

**Parameters**

| Name| Type  | Mandatory| Description                                              |
| ------ | ------ | ---- | -------------------------------------------------- |
| type   | string | Yes  | Event type, which is **'timeUpdate'** in this case.|
| callback | Callback\<number> | No  | Callback used to return the current time.<br>This parameter is supported since API version 12.            |

**Example**

```ts
avPlayer.off('timeUpdate')
```

### on('durationUpdate')<sup>9+</sup>


on(type: 'durationUpdate', callback: Callback\<number>): void

Subscribes to media asset duration changes. It is used to refresh the length of the progress bar. By default, this event is reported once in the prepared state. However, it can be repeatedly reported for special streams that trigger duration changes.
The **'durationUpdate'** event is not supported in live mode.

**Atomic service API**: This API can be used in atomic services since API version 12.

**System capability**: SystemCapability.Multimedia.Media.AVPlayer

**Parameters**

| Name  | Type    | Mandatory| Description                                              |
| -------- | -------- | ---- | -------------------------------------------------- |
| type     | string   | Yes  | Event type, which is **'durationUpdate'** in this case.|
| callback | Callback\<number> | Yes  | Callback used to return the resource duration.       |

**Example**

```ts
avPlayer.on('durationUpdate', (duration: number) => {
  console.info('durationUpdate called,new duration is :' + duration)
})
```

### off('durationUpdate')<sup>9+</sup>

off(type: 'durationUpdate', callback?: Callback\<number>): void

Unsubscribes from media asset duration changes.

**System capability**: SystemCapability.Multimedia.Media.AVPlayer

**Parameters**

| Name| Type  | Mandatory| Description                                                  |
| ------ | ------ | ---- | ------------------------------------------------------ |
| type   | string | Yes  | Event type, which is **'durationUpdate'** in this case.|
| callback | Callback\<number> | No  | Callback used to return the resource duration.<br>This parameter is supported since API version 12.       |

**Example**

```ts
avPlayer.off('durationUpdate')
```

### on('bufferingUpdate')<sup>9+</sup>

on(type: 'bufferingUpdate', callback: OnBufferingUpdateHandler): void

Subscribes to audio and video buffer changes. This subscription is supported only in network playback scenarios.

**Atomic service API**: This API can be used in atomic services since API version 12.

**System capability**: SystemCapability.Multimedia.Media.AVPlayer

**Parameters**

| Name  | Type    | Mandatory| Description                                                        |
| -------- | -------- | ---- | ------------------------------------------------------------ |
| type     | string   | Yes  | Event type, which is **'bufferingUpdate'** in this case.       |
| callback | [OnBufferingUpdateHandler](#onbufferingupdatehandler12) | Yes  | Callback invoked when the event is triggered.|

**Example**

```ts
avPlayer.on('bufferingUpdate', (infoType: media.BufferingInfoType, value: number) => {
  console.info('bufferingUpdate called,and infoType value is:' + infoType + ', value is :' + value)
})
```

### off('bufferingUpdate')<sup>9+</sup>

off(type: 'bufferingUpdate', callback?: OnBufferingUpdateHandler): void

Unsubscribes from audio and video buffer changes. 

**Atomic service API**: This API can be used in atomic services since API version 12.

**System capability**: SystemCapability.Multimedia.Media.AVPlayer

**Parameters**

| Name| Type  | Mandatory| Description                                                     |
| ------ | ------ | ---- | --------------------------------------------------------- |
| type   | string | Yes  | Event type, which is **'bufferingUpdate'** in this case.|
| callback | [OnBufferingUpdateHandler](#onbufferingupdatehandler12) | No  | Callback invoked when the event is triggered.|

**Example**

```ts
avPlayer.off('bufferingUpdate')
```

### on('startRenderFrame')<sup>9+</sup>

on(type: 'startRenderFrame', callback: Callback\<void>): void

Subscribes to the event that indicates rendering starts for the first frame. This subscription is supported only in video playback scenarios. This event only means that the playback service sends the first frame to the display module. The actual rendering effect depends on the rendering performance of the display service.

**Atomic service API**: This API can be used in atomic services since API version 12.

**System capability**: SystemCapability.Multimedia.Media.AVPlayer

**Parameters**

| Name  | Type    | Mandatory| Description                                                        |
| -------- | -------- | ---- | ------------------------------------------------------------ |
| type     | string   | Yes  | Event type, which is **'startRenderFrame'** in this case.|
| callback | Callback\<void> | Yes  | Callback invoked when the event is triggered.                          |

**Example**

```ts
avPlayer.on('startRenderFrame', () => {
  console.info('startRenderFrame called')
})
```

### off('startRenderFrame')<sup>9+</sup>

off(type: 'startRenderFrame', callback?: Callback\<void>): void

Unsubscribes from the event that indicates rendering starts for the first frame.

**System capability**: SystemCapability.Multimedia.Media.AVPlayer

**Parameters**

| Name| Type  | Mandatory| Description                                                        |
| ------ | ------ | ---- | ------------------------------------------------------------ |
| type   | string | Yes  | Event type, which is **'startRenderFrame'** in this case.|
| callback | Callback\<void> | No  | Callback invoked when the event is triggered.<br>This parameter is supported since API version 12.                  |

**Example**

```ts
avPlayer.off('startRenderFrame')
```

### on('videoSizeChange')<sup>9+</sup>

on(type: 'videoSizeChange', callback: OnVideoSizeChangeHandler): void

Subscribes to video size (width and height) changes. This subscription is supported only in video playback scenarios. By default, this event is reported only once in the prepared state. However, it is also reported upon resolution changes in the case of HLS streams.

**Atomic service API**: This API can be used in atomic services since API version 12.

**System capability**: SystemCapability.Multimedia.Media.AVPlayer

**Parameters**

| Name  | Type    | Mandatory| Description                                                        |
| -------- | -------- | ---- | ------------------------------------------------------------ |
| type     | string   | Yes  | Event type, which is **'videoSizeChange'** in this case.|
| callback | [OnVideoSizeChangeHandler](#onvideosizechangehandler12) | Yes  | Callback invoked when the event is triggered.   |

**Example**

```ts
avPlayer.on('videoSizeChange', (width: number, height: number) => {
  console.info('videoSizeChange called,and width is:' + width + ', height is :' + height)
})
```

### off('videoSizeChange')<sup>9+</sup>

off(type: 'videoSizeChange', callback?: OnVideoSizeChangeHandler): void

Unsubscribes from video size changes. 

**Atomic service API**: This API can be used in atomic services since API version 12.

**System capability**: SystemCapability.Multimedia.Media.AVPlayer

**Parameters**

| Name| Type  | Mandatory| Description                                                        |
| ------ | ------ | ---- | ------------------------------------------------------------ |
| type   | string | Yes  | Event type, which is **'videoSizeChange'** in this case.|
| callback | [OnVideoSizeChangeHandler](#onvideosizechangehandler12) | No  | Callback invoked when the event is triggered.<br>This parameter is supported since API version 12.   |

**Example**

```ts
avPlayer.off('videoSizeChange')
```

### on('audioInterrupt')<sup>9+</sup>

on(type: 'audioInterrupt', callback: Callback\<audio.InterruptEvent>): void

Subscribes to the audio interruption event. When multiple audio and video assets are played at the same time, this event is triggered based on the audio interruption mode [audio.InterruptMode](../apis-audio-kit/js-apis-audio.md#interruptmode9). The application needs to perform corresponding processing based on different audio interruption events. For details, see [Handling Audio Interruption Events](../../media/audio/audio-playback-concurrency.md).

**Atomic service API**: This API can be used in atomic services since API version 12.

**System capability**: SystemCapability.Multimedia.Media.AVPlayer

**Parameters**

| Name  | Type                                                        | Mandatory| Description                                                    |
| -------- | ------------------------------------------------------------ | ---- | -------------------------------------------------------- |
| type     | string                                                       | Yes  | Event type, which is **'audioInterrupt'** in this case.|
| callback | Callback\<[audio.InterruptEvent](../apis-audio-kit/js-apis-audio.md#interruptevent9)> | Yes  | Callback invoked when the event is triggered.                          |

**Example**

```ts
import { audio } from '@kit.AudioKit';

avPlayer.on('audioInterrupt', (info: audio.InterruptEvent) => {
  console.info('audioInterrupt called,and InterruptEvent info is:' + info)
})
```

### off('audioInterrupt')<sup>9+</sup>

off(type: 'audioInterrupt', callback?: Callback<audio.InterruptEvent>): void

Unsubscribes from the audio interruption event.

**Atomic service API**: This API can be used in atomic services since API version 12.

**System capability**: SystemCapability.Multimedia.Media.AVPlayer

**Parameters**

| Name| Type  | Mandatory| Description                                                        |
| ------ | ------ | ---- | ------------------------------------------------------------ |
| type   | string | Yes  | Event type, which is **'audioInterrupt'** in this case.|
| callback | Callback\<[audio.InterruptEvent](../apis-audio-kit/js-apis-audio.md#interruptevent9)> | No  | Callback invoked when the event is triggered.<br>This parameter is supported since API version 12.            |

**Example**

```ts
avPlayer.off('audioInterrupt')
```

### on('audioOutputDeviceChangeWithInfo')<sup>11+</sup>

on(type: 'audioOutputDeviceChangeWithInfo', callback: Callback\<audio.AudioStreamDeviceChangeInfo>): void

Subscribes to audio stream output device changes and reasons. This API uses an asynchronous callback to return the result.

When subscribing to this event, you are advised to implement the player behavior when the device is connected or disconnected by referring to [Responding to Audio Output Device Changes](../../media/audio/audio-output-device-change.md).

**Atomic service API**: This API can be used in atomic services since API version 12.

**System capability**: SystemCapability.Multimedia.Media.AVPlayer

**Parameters**

| Name  | Type                      | Mandatory| Description                                       |
| :------- | :------------------------- | :--- | :------------------------------------------ |
| type     | string                     | Yes  | Event type, which is **'outputDeviceChangeWithInfo'** in this case. The event is triggered when the output device is changed.|
| callback | Callback\<[audio.AudioStreamDeviceChangeInfo](../apis-audio-kit/js-apis-audio.md#audiostreamdevicechangeinfo11)> | Yes  | Callback used to return the output device descriptor of the current audio stream and the change reason.|

**Error codes**

| ID| Error Message                                  |
| -------- | ------------------------------------------ |
| 401      | Parameter error. Possible causes: 1. Mandatory parameters are left unspecified. 2. Incorrect parameter types. 3.Parameter verification failed.       |

**Example**

```ts
import { audio } from '@kit.AudioKit';

avPlayer.on('audioOutputDeviceChangeWithInfo', (data: audio.AudioStreamDeviceChangeInfo) => {
  console.info(`${JSON.stringify(data)}`);
});
```

### off('audioOutputDeviceChangeWithInfo')<sup>11+</sup>

off(type: 'audioOutputDeviceChangeWithInfo', callback?: Callback\<audio.AudioStreamDeviceChangeInfo>): void

Unsubscribes from audio stream output device changes and reasons. This API uses an asynchronous callback to return the result.

**Atomic service API**: This API can be used in atomic services since API version 12.

**System capability**: SystemCapability.Multimedia.Media.AVPlayer

**Parameters**

| Name  | Type                      | Mandatory| Description                                       |
| :------- | :------------------------- | :--- | :------------------------------------------ |
| type     | string                     | Yes  | Event type, which is **'outputDeviceChange'** in this case. The event is triggered when the audio output device is changed.|
| callback | Callback\<[audio.AudioStreamDeviceChangeInfo](../apis-audio-kit/js-apis-audio.md#audiostreamdevicechangeinfo11)> | No  | Callback used to return the output device descriptor of the current audio stream and the change reason.|

**Error codes**

| ID| Error Message                                  |
| -------- | ------------------------------------------ |
| 401      | Parameter error. Possible causes: 1. Mandatory parameters are left unspecified. 2. Incorrect parameter types. 3.Parameter verification failed.      |

**Example**

```ts
avPlayer.off('audioOutputDeviceChangeWithInfo');
```

### addSubtitleFromFd<sup>12+</sup>

addSubtitleFromFd(fd: number, offset?: number, length?: number): Promise\<void>

Adds an external subtitle to a video based on the FD. Currently, the external subtitle must be set after **fdSrc** of the video resource is set in an **AVPlayer** instance. This API uses a promise to return the result.

**Atomic service API**: This API can be used in atomic services since API version 12.

**System capability**: SystemCapability.Multimedia.Media.AVPlayer

**Parameters**

| Name| Type                  | Mandatory| Description                                                        |
| ------ | ---------------------- | ---- | ------------------------------------------------------------ |
| fd | number   | Yes  | Resource handle, which is obtained by calling [resourceManager.getRawFd](../apis-localization-kit/js-apis-resource-manager.md#getrawfd9).|
| offset | number | No  | Resource offset, which needs to be entered based on the preset asset information. An invalid value causes a failure to parse subtitle assets.|
| length | number | No  | Resource length, which needs to be entered based on the preset asset information. The default value is the remaining bytes from the offset in the file. An invalid value causes a failure to parse subtitle assets.|

**Return value**

| Type          | Description                                      |
| -------------- | ------------------------------------------ |
| Promise\<void> | Promise that returns no value.|

**Error codes**

| ID| Error Message                                  |
| -------- | ------------------------------------------ |
| 401      | The parameter check failed. Return by promise. |
| 5400102  | Operation not allowed. Return by promise. |

**Example**

```ts
import { common } from '@kit.AbilityKit'

let context = getContext(this) as common.UIAbilityContext
let fileDescriptor = await context.resourceManager.getRawFd('xxx.srt')

avPlayer.addSubtitleFromFd(fileDescriptor.fd, fileDescriptor.offset, fileDescriptor.length)
```

### addSubtitleFromUrl<sup>12+</sup>

addSubtitleFromUrl(url: string): Promise\<void>

Adds an external subtitle to a video based on the URL. Currently, the external subtitle must be set after **fdSrc** of the video resource is set in an **AVPlayer** instance. This API uses a promise to return the result.

**Atomic service API**: This API can be used in atomic services since API version 12.

**System capability**: SystemCapability.Multimedia.Media.AVPlayer

**Parameters**

| Name| Type  | Mandatory| Description                                                        |
| ------ | ------ | ---- | ------------------------------------------------------------ |
| url    | string | Yes  | Address of the external subtitle file.|

**Return value**

| Type          | Description                                      |
| -------------- | ------------------------------------------ |
| Promise\<void> | Promise that returns no value.|

**Error codes**

| ID| Error Message                                  |
| -------- | ------------------------------------------ |
| 401      | The parameter check failed. Return by promise. |
| 5400102  | Operation not allowed. Return by promise. |

**Example**

```ts
let fdUrl:string = 'http://xxx.xxx.xxx/xx/index.srt'

let avPlayer: media.AVPlayer = await media.createAVPlayer()
avPlayer.addSubtitleFromUrl(fdUrl)
```

### on('subtitleUpdate')<sup>12+</sup>

on(type: 'subtitleUpdate', callback: Callback\<SubtitleInfo>): void

Subscribes to subtitle update events. When external subtitles exist, the system notifies the application through the subscribed-to callback. An application can subscribe to only one subtitle update event. When the application initiates multiple subscriptions to this event, the last subscription prevails.

**Atomic service API**: This API can be used in atomic services since API version 12.

**System capability**: SystemCapability.Multimedia.Media.AVPlayer

**Parameters**

| Name  | Type    | Mandatory| Description                                                        |
| -------- | -------- | ---- | ------------------------------------------------------------ |
| type | string | Yes  | Event type, which is **'subtitleUpdate'** in this case. The event is triggered when the external subtitle is updated.|
| callback | function | Yes  | Callback invoked when the subtitle is updated.|

**Example**

```ts
avPlayer.on('subtitleUpdate', async (info: media.SubtitleInfo) => {
  if (info) {
    let text = (!info.text) ? '' : info.text
    let startTime = (!info.startTime) ? 0 : info.startTime
    let duration = (!info.duration) ? 0 : info.duration
    console.info('subtitleUpdate info: text=' + text + ' startTime=' + startTime +' duration=' + duration)
  } else {
    console.info('subtitleUpdate info is null')
  }
})
```

### off('subtitleUpdate')<sup>12+</sup>

off(type: 'subtitleUpdate', callback?: Callback\<SubtitleInfo>): void

Unsubscribes from subtitle update events.

**Atomic service API**: This API can be used in atomic services since API version 12.

**System capability**: SystemCapability.Multimedia.Media.AVPlayer

**Parameters**

| Name  | Type    | Mandatory| Description                                                        |
| -------- | -------- | ---- | ------------------------------------------------------------ |
| type | string | Yes  | Event type, which is **'subtitleUpdate'** in this case. The event is triggered when the external subtitle is updated.|
| callback | function | No  | Callback that has been registered to listen for subtitle update events.|

**Example**

```ts
avPlayer.off('subtitleUpdate')
```

### on('trackChange')<sup>12+</sup>

on(type: 'trackChange', callback: OnTrackChangeHandler): void

Subscribes to track change events. When the track changes, the system notifies the application through the subscribed-to callback. An application can subscribe to only one track change event. When the application initiates multiple subscriptions to this event, the last subscription prevails.

**Atomic service API**: This API can be used in atomic services since API version 12.

**System capability**: SystemCapability.Multimedia.Media.AVPlayer

**Parameters**

| Name  | Type    | Mandatory| Description                                                        |
| -------- | -------- | ---- | ------------------------------------------------------------ |
| type | string | Yes  | Event type, which is **'trackChange'** in this case. The event is triggered when the track changes.|
| callback | [OnTrackChangeHandler](#ontrackchangehandler12) | Yes  | Callback invoked when the event is triggered.|

**Example**

```ts
avPlayer.on('trackChange', (index: number, isSelect: boolean) => {
  console.info('trackChange info: index=' + index + ' isSelect=' + isSelect)
})
```

### off('trackChange')<sup>12+</sup>

off(type: 'trackChange', callback?: OnTrackChangeHandler): void

Unsubscribes from track change events.

**Atomic service API**: This API can be used in atomic services since API version 12.

**System capability**: SystemCapability.Multimedia.Media.AVPlayer

**Parameters**

| Name  | Type    | Mandatory| Description                                                        |
| -------- | -------- | ---- | ------------------------------------------------------------ |
| type | string | Yes  | Event type, which is **'trackChange'** in this case. The event is triggered when the track changes.|
| callback | [OnTrackChangeHandler](#ontrackchangehandler12) | No  | Callback that has been registered to listen for track changes.|

**Example**

```ts
avPlayer.off('trackChange')
```

### on('trackInfoUpdate')<sup>12+</sup>

on(type: 'trackInfoUpdate', callback: Callback\<Array\<MediaDescription>>): void

Subscribes to track information update events. When the track information is updated, the system notifies the application through the subscribed-to callback. An application can subscribe to only one track change event. When the application initiates multiple subscriptions to this event, the last subscription prevails.

**Atomic service API**: This API can be used in atomic services since API version 12.

**System capability**: SystemCapability.Multimedia.Media.AVPlayer

**Parameters**

| Name  | Type    | Mandatory| Description                                                        |
| -------- | -------- | ---- | ------------------------------------------------------------ |
| type | string | Yes  | Event type, which is **'trackInfoUpdate'** in this case. The event is triggered when the track information is updated.|
| callback | Callback\<Array\<[MediaDescription](#mediadescription8)>> | Yes  | Callback invoked when the event is triggered.|

**Example**

```ts
avPlayer.on('trackInfoUpdate', (info: Array<media.MediaDescription>) => {
  if (info) {
    for (let i = 0; i < info.length; i++) {
      let propertyIndex: Object = info[i][media.MediaDescriptionKey.MD_KEY_TRACK_INDEX];
      let propertyType: Object = info[i][media.MediaDescriptionKey.MD_KEY_TRACK_TYPE];
      console.info('track info: index=' + propertyIndex + ' tracktype=' + propertyType)
    }
  } else {
    console.info('track info is null')
  }
})
```

### off('trackInfoUpdate')<sup>12+</sup>

off(type: 'trackInfoUpdate', callback?: Callback\<Array\<MediaDescription>>): void

Unsubscribes from track information update events.

**Atomic service API**: This API can be used in atomic services since API version 12.

**System capability**: SystemCapability.Multimedia.Media.AVPlayer

**Parameters**

| Name  | Type    | Mandatory| Description                                                        |
| -------- | -------- | ---- | ------------------------------------------------------------ |
| type | string | Yes  | Event type, which is **'trackInfoUpdate'** in this case. The event is triggered when the track information is updated.|
| callback | Callback\<Array\<[MediaDescription](#mediadescription8)>> | No  | Callback that has been registered to listen for track information updates.|

**Example**

```ts
avPlayer.off('trackInfoUpdate')
```

### on('amplitudeUpdate')<sup>13+</sup>

on(type: 'amplitudeUpdate', callback: Callback\<Array\<number>>): void

Subscribes to update events of the maximum audio level value, which is periodically reported when audio resources are played.

**System capability**: SystemCapability.Multimedia.Media.AVPlayer

**Parameters**

| Name  | Type    | Mandatory| Description                                                        |
| -------- | -------- | ---- | ------------------------------------------------------------ |
| type     | string   | Yes  | Event type, which is **'amplitudeUpdate'** in this case. The event is triggered when the amplitude changes.|
| callback | Callback\<Array\<number>> | Yes  | Callback invoked when the event is triggered.|

**Example**

```ts
avPlayer.on('amplitudeUpdate', (value: Array<number>) => {
  console.info('amplitudeUpdate called,and amplitudeUpdate = ${value}')
})
```

### off('amplitudeUpdate')<sup>13+</sup>

off(type: 'amplitudeUpdate', callback?: Callback\<Array\<number>>): void

Unsubscribes from update events of the maximum amplitude.

**System capability**: SystemCapability.Multimedia.Media.AVPlayer

**Parameters**

| Name| Type  | Mandatory| Description                                                        |
| ------ | ------ | ---- | ------------------------------------------------------------ |
| type   | string | Yes  | Event type, which is **'amplitudeUpdate'** in this case. The event is triggered when the amplitude changes.|
| callback | Callback\<Array\<number>> | No  | Callback that has been registered to listen for amplitude updates.|

**Example**

```ts
avPlayer.off('amplitudeUpdate')
```

## AVPlayerState<sup>9+</sup>

type AVPlayerState = 'idle' | 'initialized' | 'prepared' | 'playing' | 'paused' | 'completed' | 'stopped' | 'released' | 'error'

Enumerates the states of the [AVPlayer](#avplayer9). Your application can proactively obtain the AVPlayer state through the **state** attribute or obtain the reported AVPlayer state by subscribing to the [stateChange](#onstatechange9) event. For details about the rules for state transition, see [Audio Playback](../../media/media/using-avplayer-for-playback.md).

**Atomic service API**: This API can be used in atomic services since API version 11.

**System capability**: SystemCapability.Multimedia.Media.AVPlayer

|              Type              | Description                                                        |
| :-----------------------------: | :----------------------------------------------------------- |
|              'idle'               | The AVPlayer enters this state after [createAVPlayer()](#mediacreateavplayer9) or [reset()](#reset9) is called.<br>In case [createAVPlayer()](#mediacreateavplayer9) is used, all attributes are set to their default values.<br>In case [reset()](#reset9) is called, the **url<sup>9+</sup>**, **fdSrc<sup>9+</sup>**, or **dataSrc<sup>10+</sup>** attribute and the **loop** attribute are reset, and other attributes are retained.|
|           'initialized'           | The AVPlayer enters this state after **url<sup>9+</sup>** or **fdSrc<sup>9+</sup>** attribute is set in the idle state. In this case, you can configure static attributes such as the window and audio.|
|            'prepared'             | The AVPlayer enters this state when [prepare()](#prepare9) is called in the initialized state. In this case, the playback engine has prepared the resources.|
|             'playing'             | The AVPlayer enters this state when [play()](#play9) is called in the prepared, paused, or completed state.|
|             'paused'              | The AVPlayer enters this state when **pause()** is called in the playing state.|
|            'completed'            | The AVPlayer enters this state when a media asset finishes playing and loop playback is not set (no **loop = true**). In this case, if [play()](#play9) is called, the AVPlayer enters the playing state and replays the media asset; if [stop()](#stop9) is called, the AVPlayer enters the stopped state.|
|             'stopped'             | The AVPlayer enters this state when [stop()](#stop9) is called in the prepared, playing, paused, or completed state. In this case, the playback engine retains the attributes but releases the memory resources. You can call [prepare()](#prepare9) to prepare the resources again, call [reset()](#reset9) to reset the attributes, or call [release()](#release9) to destroy the playback engine.|
|            'released'             | The AVPlayer enters this state when [release()](#release9) is called. The playback engine associated with the **AVPlayer** instance is destroyed, and the playback process ends. This is the final state.|
| 'error' | The AVPlayer enters this state when an irreversible error occurs in the playback engine. You can call [reset()](#reset9) to reset the attributes or call [release()](#release9) to destroy the playback engine. For details about the error codes, see [Media Error Codes](errorcode-media.md).<br>**NOTE** Relationship between the error state and the [on('error')](#onerror9) event<br>1. When the AVPlayer enters the error state, the **on('error')** event is triggered. You can obtain the detailed error information through this event.<br>2. When the AVPlayer enters the error state, the playback service stops. This requires the client to design a fault tolerance mechanism to call [reset()](#reset9) or [release()](#release9).<br>3. The client receives **on('error')** event but the AVPlayer does not enter the error state. This situation occurs due to either of the following reasons:<br>Cause 1: The client calls an API in an incorrect state or passes in an incorrect parameter, and the AVPlayer intercepts the call. If this is the case, the client must correct its code logic.<br>Cause 2: A stream error is detected during playback. As a result, the container and decoding are abnormal for a short period of time, but continuous playback and playback control operations are not affected. If this is the case, the client does not need to design a fault tolerance mechanism.|

## OnTrackChangeHandler<sup>12+</sup>

type OnTrackChangeHandler = (index: number, isSelected: boolean) => void

Describes the callback invoked for the track change event.

**Atomic service API**: This API can be used in atomic services since API version 12.

**System capability**: SystemCapability.Multimedia.Media.AVPlayer

| Name  | Type  | Mandatory| Description                                                        |
| ------ | ------ | ------ | ---------------------------------------------------------- |
| index  | number | Yes| Index of a track.    |
| isSelected | boolean | Yes| Status of the track, that is, whether the track is selected.|

## OnAVPlayerStateChangeHandle<sup>12+</sup>

type OnAVPlayerStateChangeHandle = (state: AVPlayerState, reason: StateChangeReason) => void

Describes the callback invoked for the AVPlayer state change event.

**Atomic service API**: This API can be used in atomic services since API version 12.

**System capability**: SystemCapability.Multimedia.Media.AVPlayer

| Name  | Type  | Mandatory| Description                                                        |
| ------ | ------ | ------ | ---------------------------------------------------------- |
| state  | [AVPlayerState](#avplayerstate9) | Yes| State of the AVPlayer.    |
| reason | [StateChangeReason](#statechangereason9) | Yes| Reason for the state change.|

## OnBufferingUpdateHandler<sup>12+</sup>

type OnBufferingUpdateHandler = (infoType: BufferingInfoType, value: number) => void

Describes the callback invoked for the buffering update event.

**Atomic service API**: This API can be used in atomic services since API version 12.

**System capability**: SystemCapability.Multimedia.Media.AVPlayer

| Name  | Type  | Mandatory| Description                                                        |
| ------ | ------ | ------ | ------------------------------------------------------------ |
| infoType  | [BufferingInfoType](#bufferinginfotype8) | Yes| Buffering information type.    |
| value | number | Yes| The value is fixed at **0**.|

## OnVideoSizeChangeHandler<sup>12+</sup>

type OnVideoSizeChangeHandler = (width: number, height: number) => void

Describes the callback invoked for the video size change event.

**Atomic service API**: This API can be used in atomic services since API version 12.

**System capability**: SystemCapability.Multimedia.Media.AVPlayer

| Name  | Type  | Mandatory| Description                                                        |
| ------ | ------ | ------ | ------------------------------------------------------------ |
| width  | number | Yes| Video width.    |
| height | number | Yes| Video height.|

## AVFileDescriptor<sup>9+</sup>

Describes an audio and video file asset. It is used to specify a particular asset for playback based on its offset and length within a file.

**Atomic service API**: This API can be used in atomic services since API version 11.

**System capability**: SystemCapability.Multimedia.Media.Core

| Name  | Type  | Mandatory| Description                                                        |
| ------ | ------ | ---- | ------------------------------------------------------------ |
| fd     | number | Yes  | Resource handle, which is obtained by calling [resourceManager.getRawFd](../apis-localization-kit/js-apis-resource-manager.md#getrawfd9) or [fs.open](../apis-core-file-kit/js-apis-file-fs.md#fsopen).   |
| offset | number | No  | Resource offset, which needs to be entered based on the preset asset information. The default value is **0**. An invalid value causes a failure to parse audio and video assets.|
| length | number | No  | Resource length, which needs to be entered based on the preset asset information. The default value is the remaining bytes from the offset in the file. An invalid value causes a failure to parse audio and video assets.|

## AVDataSrcDescriptor<sup>10+</sup>

Defines the descriptor of an audio and video file, which is used in DataSource playback mode.<br>Use scenario: An application can create a playback instance and start playback before it finishes downloading the audio and video resources.

**Atomic service API**: This API can be used in atomic services since API version 11.

**System capability**: SystemCapability.Multimedia.Media.AVPlayer

| Name  | Type  | Mandatory| Description                                                        |
| ------ | ------ | ---- | ------------------------------------------------------------ |
| fileSize     | number | Yes  | Size of the file to play, in bytes. The value **-1** indicates that the size is unknown. If **fileSize** is set to **-1**, the playback mode is similar to the live mode. In this mode, the **seek** and **setSpeed** operations cannot be performed, and the **loop** attribute cannot be set, indicating that loop playback is unavailable.|
| callback | (buffer: ArrayBuffer, length: number, pos?: number) => number | Yes  | Callback used to fill in data.<br>- Function: callback: (buffer: ArrayBuffer, length: number, pos?:number) => number;<br>- **buffer**: memory to be filled. The value is of the ArrayBuffer type. This parameter is mandatory.<br>- **length**: maximum length of the memory to be filled. The value is of the number type. This parameter is mandatory.<br>- **pos**: position of the data to be filled in the file. The value is of the number type. This parameter is optional. When **fileSize** is set to **-1**, this parameter cannot be used.<br>- Return value: length of the data filled, which is of the number type. If **-1** is returned, the end of stream is reached. If **-2** is returned, an unrecoverable error occurs.|

## SubtitleInfo<sup>12+</sup>

Describes the external subtitle information. When a subtitle update event is subscribed to, the information about the external subtitle is returned through a callback.

**Atomic service API**: This API can be used in atomic services since API version 12.

**System capability**: SystemCapability.Multimedia.Media.Core

| Name  | Type  | Mandatory| Description                                                        |
| ------ | ------ | ---- | ------------------------------------------------------------ |
| text | string | No | Text information of the subtitle.|
| startTime | number | No | Start time for displaying the subtitle, in milliseconds.|
| duration | number | No| Duration for displaying the subtitle, in milliseconds.|

## SeekMode<sup>8+</sup>

Enumerates the video playback seek modes, which can be passed in the **seek** API.

**System capability**: SystemCapability.Multimedia.Media.Core

| Name          | Value  | Description                                                        |
| -------------- | ---- | ------------------------------------------------------------ |
| SEEK_NEXT_SYNC | 0    | Seeks to the next key frame at the specified position. You are advised to use this value for the rewind operation.<br>**Atomic service API**: This API can be used in atomic services since API version 11.|
| SEEK_PREV_SYNC | 1    | Seeks to the previous key frame at the specified position. You are advised to use this value for the fast-forward operation.<br>**Atomic service API**: This API can be used in atomic services since API version 11.|
| SEEK_CLOSEST<sup>12+</sup> | 2    | Seeks to the frame closest to the specified position. You are advised to use this value for accurate seek.<br>**Atomic service API**: This API can be used in atomic services since API version 12.|

## SwitchMode<sup>12+</sup>

Enumerates the track switching modes for video playback. The mode can be passed in to **selectTrack**. Currently, this enum is valid only for DASH video tracks.

**System capability**: SystemCapability.Multimedia.Media.Core

| Name          | Value  | Description                                                        |
| -------------- | ---- | ------------------------------------------------------------ |
| SMOOTH | 0    | Smooth playback is ensured after the switching. This mode has a delay, that is, the switching does not take effect immediately.<br>**Atomic service API**: This API can be used in atomic services since API version 12.|
| SEGMENT | 1    | The playback starts from the start position of the current segment after the switching. In this mode, the switching takes effect immediately and repeated playback may occur.<br>**Atomic service API**: This API can be used in atomic services since API version 12.|
| CLOSEST | 2    | The playback starts from the frame closest to the current playback time. In this mode, the switching takes effect immediately, and the playback is suspended for 3s to 5s and then resumed.<br>**Atomic service API**: This API can be used in atomic services since API version 12.|

## PlaybackSpeed<sup>8+</sup>

Enumerates the video playback speeds, which can be passed in the **setSpeed** API.

**Atomic service API**: This API can be used in atomic services since API version 12.

**System capability**: SystemCapability.Multimedia.Media.VideoPlayer

| Name                | Value  | Description                          |
| -------------------- | ---- | ------------------------------ |
| SPEED_FORWARD_0_75_X | 0    | Plays the video at 0.75 times the normal speed.<br>**Atomic service API**: This API can be used in atomic services since API version 12.|
| SPEED_FORWARD_1_00_X | 1    | Plays the video at the normal speed.<br>**Atomic service API**: This API can be used in atomic services since API version 12.        |
| SPEED_FORWARD_1_25_X | 2    | Plays the video at 1.25 times the normal speed.<br>**Atomic service API**: This API can be used in atomic services since API version 12.|
| SPEED_FORWARD_1_75_X | 3    | Plays the video at 1.75 times the normal speed.<br>**Atomic service API**: This API can be used in atomic services since API version 12.|
| SPEED_FORWARD_2_00_X | 4    | Plays the video at 2.00 times the normal speed.<br>**Atomic service API**: This API can be used in atomic services since API version 12.|
| SPEED_FORWARD_0_50_X<sup>12+</sup> | 5    | Plays the video at 0.50 times the normal speed.<br>**Atomic service API**: This API can be used in atomic services since API version 12.|
| SPEED_FORWARD_1_50_X<sup>12+</sup> | 6    | Plays the video at 1.50 times the normal speed.<br>**Atomic service API**: This API can be used in atomic services since API version 12.|
| SPEED_FORWARD_3_00_X<sup>13+</sup> | 7    | Plays the video at 3.00 times the normal speed.<br>**Atomic service API**: This API can be used in atomic services since API version 13.|
| SPEED_FORWARD_0_25_X<sup>12+</sup> | 8    | Plays the video at 0.25 times the normal speed.<br>**Atomic service API**: This API can be used in atomic services since API version 12.|
| SPEED_FORWARD_0_125_X<sup>12+</sup> | 9    | Plays the video at 0.125 times the normal speed.<br>**Atomic service API**: This API can be used in atomic services since API version 12.|

## VideoScaleType<sup>9+</sup>

Enumerates the video scale modes.

**Atomic service API**: This API can be used in atomic services since API version 12.

**System capability**: SystemCapability.Multimedia.Media.VideoPlayer

| Name                     | Value  | Description                                            |
| ------------------------- | ---- | ------------------------------------------------ |
| VIDEO_SCALE_TYPE_FIT      | 0    | Default mode. The video will be stretched to fit the window.             |
| VIDEO_SCALE_TYPE_FIT_CROP | 1    | The video will be stretched to fit the window, without changing its aspect ratio. The content may be cropped.|

## MediaDescription<sup>8+</sup>

Defines media information in key-value mode.

**Atomic service API**: This API can be used in atomic services since API version 11.

**System capability**: SystemCapability.Multimedia.Media.Core

| Name         | Type  | Mandatory| Description                                                        |
| ------------- | ------ | ---- | ------------------------------------------------------------ |
| [key: string] | Object | Yes  | For details about the key range supported and the object type and range of each key, see [MediaDescriptionKey](#mediadescriptionkey8).|

**Example**

```ts
import { BusinessError } from '@kit.BasicServicesKit';

function printfItemDescription(obj: media.MediaDescription, key: string) {
  let property: Object = obj[key];
  console.info('audio key is ' + key); // Specify a key. For details about the keys, see [MediaDescriptionKey].
  console.info('audio value is ' + property); // Obtain the value of the key. The value can be any type. For details about the types, see [MediaDescriptionKey].
}

let avPlayer: media.AVPlayer | undefined = undefined;
media.createAVPlayer((err: BusinessError, player: media.AVPlayer) => {
  if(player != null) {
    avPlayer = player;
    console.info(`Succeeded in creating AVPlayer`);
    avPlayer.getTrackDescription((error: BusinessError, arrList: Array<media.MediaDescription>) => {
      if (arrList != null) {
        for (let i = 0; i < arrList.length; i++) {
          printfItemDescription(arrList[i], media.MediaDescriptionKey.MD_KEY_TRACK_TYPE);  // Print the MD_KEY_TRACK_TYPE value of each track.
        }
      } else {
        console.error(`Failed to get TrackDescription, error:${error}`);
      }
    });
  } else {
    console.error(`Failed to create AVPlayer, error message:${err.message}`);
  }
});
```

## PlaybackInfo<sup>12+</sup>

Defines the playback information in key-value pairs.

**System capability**: SystemCapability.Multimedia.Media.Core

| Name         | Type  | Mandatory| Description                                                        |
| ------------- | ------ | ---- | ------------------------------------------------------------ |
| [key: string] | Object | Yes  | For details about the key range supported and the object type and range of each key, see [PlaybackInfoKey](#playbackinfokey12).|

**Example**

```ts
import { BusinessError } from '@kit.BasicServicesKit';

function printfPlaybackInfo(obj: media.PlaybackInfo, key: string) {
  let property: Object = obj[key];
  console.info('key is ' + key); // // Specify a key. For details about the keys, see [PlaybackInfoKey].
  console.info('value is ' + property); // Obtain the value of the key. The value can be any type. For details about the types, see [PlaybackInfoKey].
}

let avPlayer: media.AVPlayer | undefined = undefined;
let playbackInfo: media.PlaybackInfo | undefined = undefined;
media.createAVPlayer(async (err: BusinessError, player: media.AVPlayer) => {
  if (player != null) {
    avPlayer = player;
    console.info(`Succeeded in creating AVPlayer`);
    if (avPlayer) {
      try {
        playbackInfo = await avPlayer.getPlaybackInfo();
        console.info(`AVPlayer getPlaybackInfo = ${JSON.stringify(playbackInfo)}`); // Print PlaybackInfo.
        printfPlaybackInfo(playbackInfo, media.PlaybackInfoKey.SERVER_IP_ADDRESS); // Print the IP address.
      } catch (error) {
        console.error(`error = ${error}`);
      }
    }
  } else {
    console.error(`Failed to create AVPlayer, error message:${err.message}`);
  }
});
```

## AVRecorder<sup>9+</sup>

A recording management class that provides APIs to record media assets. Before calling any API in **AVRecorder**, you must use [createAVRecorder()](#mediacreateavrecorder9) to create an **AVRecorder** instance.

For details about the audio and video recording demo, see [Audio Recording](../../media/media/using-avrecorder-for-recording.md) and [Video Recording](../../media/media/video-recording.md).

> **NOTE**
>
> To use the camera to record videos, the camera module is required. For details about how to use the APIs provided by the camera module, see [Camera Management](../apis-camera-kit/js-apis-camera.md).

### Attributes

**System capability**: SystemCapability.Multimedia.Media.AVRecorder

| Name   | Type                                | Read-Only| Optional| Description              |
| ------- | ------------------------------------ | ---- | ---- | ------------------ |
| state9+ | [AVRecorderState](#avrecorderstate9) | Yes  | No  | AVRecorder state.<br>**Atomic service API**: This API can be used in atomic services since API version 12.|

### prepare<sup>9+</sup>

prepare(config: AVRecorderConfig, callback: AsyncCallback\<void>): void

Sets audio and video recording parameters. This API uses an asynchronous callback to return the result.

**Required permissions:** ohos.permission.MICROPHONE

This permission is required only if audio recording is involved.

To use the camera to record videos, the camera module is required. For details about how to use the APIs provided by the camera module, see [Camera Management](../apis-camera-kit/js-apis-camera.md).

**System capability**: SystemCapability.Multimedia.Media.AVRecorder

**Parameters**

| Name  | Type                                  | Mandatory| Description                                 |
| -------- | -------------------------------------- | ---- | ------------------------------------- |
| config   | [AVRecorderConfig](#avrecorderconfig9) | Yes  | Audio and video recording parameters to set.           |
| callback | AsyncCallback\<void>                   | Yes  | Callback used to return the result. If the operation is successful, **err** is **undefined**; otherwise, **err** is an error object.|

**Error codes**

For details about the error codes, see [Media Error Codes](errorcode-media.md).

| ID| Error Message                               |
| -------- | --------------------------------------- |
| 201      | Permission denied. Return by callback.  |
| 401      | Parameter error. Possible causes: 1. Mandatory parameters are left unspecified. 2. Incorrect parameter types. 3.Parameter verification failed.    |
| 5400102  | Operate not permit. Return by callback. |
| 5400105  | Service died. Return by callback.       |

**Example**

```ts
import { BusinessError } from '@kit.BasicServicesKit';

// Configure the parameters based on those supported by the hardware device.
let avRecorderProfile: media.AVRecorderProfile = {
  audioBitrate : 48000,
  audioChannels : 2,
  audioCodec : media.CodecMimeType.AUDIO_AAC,
  audioSampleRate : 48000,
  fileFormat : media.ContainerFormatType.CFT_MPEG_4,
  videoBitrate : 2000000,
  videoCodec : media.CodecMimeType.VIDEO_AVC,
  videoFrameWidth : 640,
  videoFrameHeight : 480,
  videoFrameRate : 30
}
let avRecorderConfig: media.AVRecorderConfig = {
  audioSourceType : media.AudioSourceType.AUDIO_SOURCE_TYPE_MIC,
  videoSourceType : media.VideoSourceType.VIDEO_SOURCE_TYPE_SURFACE_YUV,
  profile : avRecorderProfile,
  url : 'fd://', // Before passing in an FD to this parameter, the file must be created by the caller and granted with the read and write permissions. Example value: fd://45.
  rotation: 0, // The value can be 0, 90, 180, or 270. If any other value is used, prepare() reports an error.
  location : { latitude : 30, longitude : 130 }
}

avRecorder.prepare(avRecorderConfig, (err: BusinessError) => {
  if (err) {
    console.error('Failed to prepare and error is ' + err.message);
  } else {
    console.info('Succeeded in preparing');
  }
})
```

### prepare<sup>9+</sup>

prepare(config: AVRecorderConfig): Promise\<void>

Sets audio and video recording parameters. This API uses a promise to return the result.

**Required permissions:** ohos.permission.MICROPHONE

This permission is required only if audio recording is involved.

To use the camera to record videos, the camera module is required. For details about how to use the APIs provided by the camera module, see [Camera Management](../apis-camera-kit/js-apis-camera.md).

**Atomic service API**: This API can be used in atomic services since API version 12.

**System capability**: SystemCapability.Multimedia.Media.AVRecorder

**Parameters**

| Name| Type                                  | Mandatory| Description                      |
| ------ | -------------------------------------- | ---- | -------------------------- |
| config | [AVRecorderConfig](#avrecorderconfig9) | Yes  | Audio and video recording parameters to set.|

**Return value**

| Type          | Description                                      |
| -------------- | ------------------------------------------ |
| Promise\<void> | Promise that returns no value.|

**Error codes**

For details about the error codes, see [Media Error Codes](errorcode-media.md).

| ID| Error Message                              |
| -------- | -------------------------------------- |
| 201      | Permission denied. Return by promise.  |
| 401      | Parameter error. Possible causes: 1. Mandatory parameters are left unspecified. 2. Incorrect parameter types. 3.Parameter verification failed.    |
| 5400102  | Operate not permit. Return by promise. |
| 5400105  | Service died. Return by promise.       |

**Example**

```ts
import { BusinessError } from '@kit.BasicServicesKit';

// Configure the parameters based on those supported by the hardware device.
let avRecorderProfile: media.AVRecorderProfile = {
  audioBitrate : 48000,
  audioChannels : 2,
  audioCodec : media.CodecMimeType.AUDIO_AAC,
  audioSampleRate : 48000,
  fileFormat : media.ContainerFormatType.CFT_MPEG_4,
  videoBitrate : 2000000,
  videoCodec : media.CodecMimeType.VIDEO_AVC,
  videoFrameWidth : 640,
  videoFrameHeight : 480,
  videoFrameRate : 30
}
let avRecorderConfig: media.AVRecorderConfig = {
  audioSourceType : media.AudioSourceType.AUDIO_SOURCE_TYPE_MIC,
  videoSourceType : media.VideoSourceType.VIDEO_SOURCE_TYPE_SURFACE_YUV,
  profile : avRecorderProfile,
  url : 'fd://', // Before passing in an FD to this parameter, the file must be created by the caller and granted with the read and write permissions. Example value: fd://45.
  rotation: 0, // The value can be 0, 90, 180, or 270. If any other value is used, prepare() reports an error.
  location : { latitude : 30, longitude : 130 }
}

avRecorder.prepare(avRecorderConfig).then(() => {
  console.info('Succeeded in preparing');
}).catch((err: BusinessError) => {
  console.error('Failed to prepare and catch error is ' + err.message);
});
```

### getInputSurface<sup>9+</sup>

getInputSurface(callback: AsyncCallback\<string>): void

Obtains the surface required for recording. This API uses an asynchronous callback to return the result. The caller obtains the **surfaceBuffer** from this surface and fills in the corresponding video data.

Note that the video data must carry the timestamp (in ns) and buffer size, and the start time of the timestamp must be based on the system startup time.

This API can be called only after the [prepare()](#prepare9-2) API is called.

**System capability**: SystemCapability.Multimedia.Media.AVRecorder

**Parameters**

| Name  | Type                  | Mandatory| Description                       |
| -------- | ---------------------- | ---- | --------------------------- |
| callback | AsyncCallback\<string> | Yes  | Callback used to return the result. If the operation is successful, **err** is **undefined** and **data** is the surface ID obtained; otherwise, **err** is an error object.|

**Error codes**

For details about the error codes, see [Media Error Codes](errorcode-media.md).

| ID| Error Message                               |
| -------- | --------------------------------------- |
| 5400102  | Operate not permit. Return by callback. |
| 5400103  | IO error. Return by callback.           |
| 5400105  | Service died. Return by callback.       |

**Example**

```ts
import { BusinessError } from '@kit.BasicServicesKit';
let surfaceID: string; // The surfaceID is transferred to the camera API to create a videoOutput instance.

avRecorder.getInputSurface((err: BusinessError, surfaceId: string) => {
  if (err) {
    console.error('Failed to do getInputSurface and error is ' + err.message);
  } else {
    console.info('Succeeded in doing getInputSurface');
    surfaceID = surfaceId;
  }
});

```

### getInputSurface<sup>9+</sup>

getInputSurface(): Promise\<string>

Obtains the surface required for recording. This API uses a promise to return the result. The caller obtains the **surfaceBuffer** from this surface and fills in the corresponding video data.

Note that the video data must carry the timestamp (in ns) and buffer size, and the start time of the timestamp must be based on the system startup time.

This API can be called only after the [prepare()](#prepare9-3) API is called.

**System capability**: SystemCapability.Multimedia.Media.AVRecorder

**Return value**

| Type            | Description                            |
| ---------------- | -------------------------------- |
| Promise\<string> | Promise used to return the result.|

**Error codes**

For details about the error codes, see [Media Error Codes](errorcode-media.md).

| ID| Error Message                              |
| -------- | -------------------------------------- |
| 5400102  | Operate not permit. Return by promise. |
| 5400103  | IO error. Return by promise.           |
| 5400105  | Service died. Return by promise.       |

**Example**

```ts
import { BusinessError } from '@kit.BasicServicesKit';
let surfaceID: string; // The surfaceID is transferred to the camera API to create a videoOutput instance.

avRecorder.getInputSurface().then((surfaceId: string) => {
  console.info('Succeeded in getting InputSurface');
  surfaceID = surfaceId;
}).catch((err: BusinessError) => {
  console.error('Failed to get InputSurface and catch error is ' + err.message);
});
```

### updateRotation<sup>12+</sup>

updateRotation(rotation: number): Promise\<void>

Updates the video rotation angle. This API uses a promise to return the result.

This API can be called only after the [prepare()](#prepare9-3) event is triggered and before the [start()](#start9) API is called.

**System capability**: SystemCapability.Multimedia.Media.AVRecorder

**Parameters**

| Name  | Type                | Mandatory| Description                       |
| -------- | -------------------- | ---- | --------------------------- |
| rotation | number | Yes  | Rotation angle, which can only be 0, 90, 180, or 270 degrees.|

**Return value**

| Type            | Description                            |
| ---------------- | -------------------------------- |
| Promise\<void> | Promise that returns no value.|

**Error codes**

For details about the error codes, see [Media Error Codes](errorcode-media.md).

| ID| Error Message                              |
| -------- | -------------------------------------- |
|   401    | Parameter error. Possible causes: 1. Mandatory parameters are left unspecified. 2. Incorrect parameter types. 3.Parameter verification failed.   |
| 5400102  | Operation not allowed. Return by promise. |
| 5400103  | IO error. Return by promise.           |
| 5400105  | Service died. Return by promise.       |

**Example**

```ts
import { BusinessError } from '@kit.BasicServicesKit';

let rotation = 90

avRecorder.updateRotation(rotation).then(() => {
  console.info('Succeeded in updateRotation');
}).catch((err: BusinessError) => {
  console.error('Failed to updateRotation and catch error is ' + err.message);
});
```

### start<sup>9+</sup>

start(callback: AsyncCallback\<void>): void

Starts recording. This API uses an asynchronous callback to return the result.

For audio-only recording, this API can be called only after the [prepare()](#prepare9-2) API is called. For video-only recording, this API can be called only after the [getInputSurface()](#getinputsurface9) API is called.

**System capability**: SystemCapability.Multimedia.Media.AVRecorder

**Parameters**

| Name  | Type                | Mandatory| Description                        |
| -------- | -------------------- | ---- | ---------------------------- |
| callback | AsyncCallback\<void> | Yes  |Callback used to return the result. If the operation is successful, **err** is **undefined**; otherwise, **err** is an error object.|

**Error codes**

For details about the error codes, see [Media Error Codes](errorcode-media.md).

| ID| Error Message                               |
| -------- | --------------------------------------- |
| 5400102  | Operate not permit. Return by callback. |
| 5400103  | IO error. Return by callback.           |
| 5400105  | Service died. Return by callback.       |

**Example**

```ts
import { BusinessError } from '@kit.BasicServicesKit';

avRecorder.start((err: BusinessError) => {
  if (err) {
    console.error('Failed to start AVRecorder and error is ' + err.message);
  } else {
    console.info('Succeeded in starting AVRecorder');
  }
});
```

### start<sup>9+</sup>

start(): Promise\<void>

Starts recording. This API uses a promise to return the result.

For audio-only recording, this API can be called only after the [prepare()](#prepare9-3) API is called. For video-only recording, this API can be called only after the [getInputSurface()](#getinputsurface9-1) API is called.

**Atomic service API**: This API can be used in atomic services since API version 12.

**System capability**: SystemCapability.Multimedia.Media.AVRecorder

**Return value**

| Type          | Description                                 |
| -------------- | ------------------------------------- |
| Promise\<void> | Promise that returns no value.|

**Error codes**

For details about the error codes, see [Media Error Codes](errorcode-media.md).

| ID| Error Message                              |
| -------- | -------------------------------------- |
| 5400102  | Operate not permit. Return by promise. |
| 5400103  | IO error. Return by promise.           |
| 5400105  | Service died. Return by promise.       |

**Example**

```ts
import { BusinessError } from '@kit.BasicServicesKit';

avRecorder.start().then(() => {
  console.info('Succeeded in starting AVRecorder');
}).catch((err: BusinessError) => {
  console.error('Failed to start AVRecorder and catch error is ' + err.message);
});
```

### pause<sup>9+</sup>

pause(callback: AsyncCallback\<void>): void

Pauses recording. This API uses an asynchronous callback to return the result.

This API can be called only after the [start()](#start9) API is called. You can call [resume()](#resume9) to resume recording.

**System capability**: SystemCapability.Multimedia.Media.AVRecorder

**Parameters**

| Name  | Type                | Mandatory| Description                       |
| -------- | -------------------- | ---- | --------------------------- |
| callback | AsyncCallback\<void> | Yes  | Callback used to return the result. If the operation is successful, **err** is **undefined**; otherwise, **err** is an error object.|

**Error codes**

For details about the error codes, see [Media Error Codes](errorcode-media.md).

| ID| Error Message                               |
| -------- | --------------------------------------- |
| 5400102  | Operate not permit. Return by callback. |
| 5400103  | IO error. Return by callback.           |
| 5400105  | Service died. Return by callback.       |

**Example**

```ts
import { BusinessError } from '@kit.BasicServicesKit';

avRecorder.pause((err: BusinessError) => {
  if (err) {
    console.error('Failed to pause AVRecorder and error is ' + err.message);
  } else {
    console.info('Succeeded in pausing');
  }
});
```

### pause<sup>9+</sup>

pause(): Promise\<void>

Pauses recording. This API uses a promise to return the result.

This API can be called only after the [start()](#start9-1) API is called. You can call [resume()](#resume9-1) to resume recording.

**Atomic service API**: This API can be used in atomic services since API version 12.

**System capability**: SystemCapability.Multimedia.Media.AVRecorder

**Return value**

| Type          | Description                                 |
| -------------- | ------------------------------------- |
| Promise\<void> | Promise that returns no value.|

**Error codes**

For details about the error codes, see [Media Error Codes](errorcode-media.md).

| ID| Error Message                              |
| -------- | -------------------------------------- |
| 5400102  | Operate not permit. Return by promise. |
| 5400103  | IO error. Return by promise.           |
| 5400105  | Service died. Return by promise.       |

**Example**

```ts
import { BusinessError } from '@kit.BasicServicesKit';

avRecorder.pause().then(() => {
  console.info('Succeeded in pausing');
}).catch((err: BusinessError) => {
  console.error('Failed to pause AVRecorder and catch error is ' + err.message);
});
```

### resume<sup>9+</sup>

resume(callback: AsyncCallback\<void>): void

Resumes recording. This API uses an asynchronous callback to return the result.

This API can be called only after the [pause()](#pause9-2) API is called.

**System capability**: SystemCapability.Multimedia.Media.AVRecorder

**Parameters**

| Name  | Type                | Mandatory| Description                        |
| -------- | -------------------- | ---- | ---------------------------- |
| callback | AsyncCallback\<void> | Yes  | Callback used to return the result. If the operation is successful, **err** is **undefined**; otherwise, **err** is an error object.|

**Error codes**

For details about the error codes, see [Media Error Codes](errorcode-media.md).

| ID| Error Message                               |
| -------- | --------------------------------------- |
| 5400102  | Operate not permit. Return by callback. |
| 5400103  | IO error. Return by callback.           |
| 5400105  | Service died. Return by callback.       |

**Example**

```ts
import { BusinessError } from '@kit.BasicServicesKit';

avRecorder.resume((err: BusinessError) => {
  if (err) {
    console.error('Failed to resume AVRecorder and error is ' + err.message);
  } else {
    console.info('Succeeded in resuming AVRecorder');
  }
});
```

### resume<sup>9+</sup>

resume(): Promise\<void>

Resumes recording. This API uses a promise to return the result.

This API can be called only after the [pause()](#pause9-3) API is called.

**Atomic service API**: This API can be used in atomic services since API version 12.

**System capability**: SystemCapability.Multimedia.Media.AVRecorder

**Return value**

| Type          | Description                                 |
| -------------- | ------------------------------------- |
| Promise\<void> | Promise that returns no value.|

**Error codes**

For details about the error codes, see [Media Error Codes](errorcode-media.md).

| ID| Error Message                              |
| -------- | -------------------------------------- |
| 5400102  | Operate not permit. Return by promise. |
| 5400103  | IO error. Return by promise.           |
| 5400105  | Service died. Return by promise.       |

**Example**

```ts
import { BusinessError } from '@kit.BasicServicesKit';

avRecorder.resume().then(() => {
  console.info('Succeeded in resuming AVRecorder');
}).catch((err: BusinessError) => {
  console.error('Failed to resume  AVRecorder failed and catch error is ' + err.message);
});
```

### stop<sup>9+</sup>

stop(callback: AsyncCallback\<void>): void

Stops recording. This API uses an asynchronous callback to return the result.

This API can be called only after the [start()](#start9) or [pause()](#pause9-2) API is called.

For audio-only recording, you can call [prepare()](#prepare9-2) again for re-recording. For video-only recording or audio and video recording, you can call [prepare()](#prepare9-2) and [getInputSurface()](#getinputsurface9) again for re-recording.

**System capability**: SystemCapability.Multimedia.Media.AVRecorder

**Parameters**

| Name  | Type                | Mandatory| Description                        |
| -------- | -------------------- | ---- | ---------------------------- |
| callback | AsyncCallback\<void> | Yes  | Callback used to return the result. If the operation is successful, **err** is **undefined**; otherwise, **err** is an error object.|

**Error codes**

For details about the error codes, see [Media Error Codes](errorcode-media.md).

| ID| Error Message                               |
| -------- | --------------------------------------- |
| 5400102  | Operate not permit. Return by callback. |
| 5400103  | IO error. Return by callback.           |
| 5400105  | Service died. Return by callback.       |

**Example**

```ts
import { BusinessError } from '@kit.BasicServicesKit';

avRecorder.stop((err: BusinessError) => {
  if (err) {
    console.error('Failed to stop AVRecorder and error is ' + err.message);
  } else {
    console.info('Succeeded in stopping AVRecorder');
  }
});
```

### stop<sup>9+</sup>

stop(): Promise\<void>

Stops recording. This API uses a promise to return the result.

This API can be called only after the [start()](#start9-1) or [pause()](#pause9-3) API is called.

For audio-only recording, you can call [prepare()](#prepare9-3) again for re-recording. For video-only recording or audio and video recording, you can call [prepare()](#prepare9-3) and [getInputSurface()](#getinputsurface9-1) again for re-recording.

**Atomic service API**: This API can be used in atomic services since API version 12.

**System capability**: SystemCapability.Multimedia.Media.AVRecorder

**Return value**

| Type          | Description                                 |
| -------------- | ------------------------------------- |
| Promise\<void> | Promise that returns no value.|

**Error codes**

For details about the error codes, see [Media Error Codes](errorcode-media.md).

| ID| Error Message                              |
| -------- | -------------------------------------- |
| 5400102  | Operate not permit. Return by promise. |
| 5400103  | IO error. Return by promise.           |
| 5400105  | Service died. Return by promise.       |

**Example**

```ts
import { BusinessError } from '@kit.BasicServicesKit';

avRecorder.stop().then(() => {
  console.info('Succeeded in stopping AVRecorder');
}).catch((err: BusinessError) => {
  console.error('Failed to stop AVRecorder and catch error is ' + err.message);
});
```

### reset<sup>9+</sup>

reset(callback: AsyncCallback\<void>): void

Resets audio and video recording. This API uses an asynchronous callback to return the result.

For audio-only recording, you can call [prepare()](#prepare9-2) again for re-recording. For video-only recording or audio and video recording, you can call [prepare()](#prepare9-2) and [getInputSurface()](#getinputsurface9) again for re-recording.

**System capability**: SystemCapability.Multimedia.Media.AVRecorder

**Parameters**

| Name  | Type                | Mandatory| Description                          |
| -------- | -------------------- | ---- | ------------------------------ |
| callback | AsyncCallback\<void> | Yes  | Callback used to return the result. If the operation is successful, **err** is **undefined**; otherwise, **err** is an error object.|

**Error codes**

For details about the error codes, see [Media Error Codes](errorcode-media.md).

| ID| Error Message                         |
| -------- | --------------------------------- |
| 5400103  | IO error. Return by callback.     |
| 5400105  | Service died. Return by callback. |

**Example**

```ts
import { BusinessError } from '@kit.BasicServicesKit';

avRecorder.reset((err: BusinessError) => {
  if (err) {
    console.error('Failed to reset AVRecorder and error is ' + err.message);
  } else {
    console.info('Succeeded in resetting AVRecorder');
  }
});
```

### reset<sup>9+</sup>

reset(): Promise\<void>

Resets audio and video recording. This API uses a promise to return the result.

For audio-only recording, you can call [prepare()](#prepare9-3) again for re-recording. For video-only recording or audio and video recording, you can call [prepare()](#prepare9-3) and [getInputSurface()](#getinputsurface9-1) again for re-recording.

**System capability**: SystemCapability.Multimedia.Media.AVRecorder

**Return value**

| Type          | Description                                   |
| -------------- | --------------------------------------- |
| Promise\<void> | Promise that returns no value.|

**Error codes**

For details about the error codes, see [Media Error Codes](errorcode-media.md).

| ID| Error Message                        |
| -------- | -------------------------------- |
| 5400103  | IO error. Return by promise.     |
| 5400105  | Service died. Return by promise. |

**Example**

```ts
import { BusinessError } from '@kit.BasicServicesKit';

avRecorder.reset().then(() => {
  console.info('Succeeded in resetting AVRecorder');
}).catch((err: BusinessError) => {
  console.error('Failed to reset and catch error is ' + err.message);
});
```

### release<sup>9+</sup>

release(callback: AsyncCallback\<void>): void

Releases the audio and video recording resources. This API uses an asynchronous callback to return the result.

After the resources are released, you can no longer perform any operation on the **AVRecorder** instance.

**System capability**: SystemCapability.Multimedia.Media.AVRecorder

**Parameters**

| Name  | Type                | Mandatory| Description                              |
| -------- | -------------------- | ---- | ---------------------------------- |
| callback | AsyncCallback\<void> | Yes  | Callback used to return the result. If the operation is successful, **err** is **undefined**; otherwise, **err** is an error object.|

**Error codes**

For details about the error codes, see [Media Error Codes](errorcode-media.md).

| ID| Error Message                         |
| -------- | --------------------------------- |
| 5400105  | Service died. Return by callback. |

**Example**

```ts
import { BusinessError } from '@kit.BasicServicesKit';

avRecorder.release((err: BusinessError) => {
  if (err) {
    console.error('Failed to release AVRecorder and error is ' + err.message);
  } else {
    console.info('Succeeded in releasing AVRecorder');
  }
});
```

### release<sup>9+</sup>

release(): Promise\<void>

Releases the audio and video recording resources. This API uses a promise to return the result.

After the resources are released, you can no longer perform any operation on the **AVRecorder** instance.

**Atomic service API**: This API can be used in atomic services since API version 12.

**System capability**: SystemCapability.Multimedia.Media.AVRecorder

**Return value**

| Type          | Description                                       |
| -------------- | ------------------------------------------- |
| Promise\<void> | Promise that returns no value.|

**Error codes**

For details about the error codes, see [Media Error Codes](errorcode-media.md).

| ID| Error Message                         |
| -------- | --------------------------------- |
| 5400105  | Service died. Return by callback. |

**Example**

```ts
import { BusinessError } from '@kit.BasicServicesKit';

avRecorder.release().then(() => {
  console.info('Succeeded in releasing AVRecorder');
}).catch((err: BusinessError) => {
  console.error('Failed to release AVRecorder and catch error is ' + err.message);
});
```

### getCurrentAudioCapturerInfo<sup>11+</sup>

getCurrentAudioCapturerInfo(callback: AsyncCallback\<audio.AudioCapturerChangeInfo>): void

Obtains the information about the current audio capturer. This API uses an asynchronous callback to return the result.

This API can be called only after the **prepare()** API is called. If this API is called after **stop()** is successfully called, an error is reported.

**System capability**: SystemCapability.Multimedia.Media.AVRecorder

**Parameters**

| Name  | Type                                                        | Mandatory| Description                                |
| -------- | ------------------------------------------------------------ | ---- | ------------------------------------ |
| callback | AsyncCallback\<[audio.AudioCapturerChangeInfo](../apis-audio-kit/js-apis-audio.md#audiocapturerchangeinfo9)> | Yes  | Callback used to return the result. If the operation is successful, **err** is **undefined** and **data** is the **audio.AudioCapturerChangeInfo** object obtained; otherwise, **err** is an error object.|

**Error codes**

For details about the error codes, see [Media Error Codes](errorcode-media.md).

| ID| Error Message                                  |
| -------- | ------------------------------------------ |
| 5400102  | Operation not allowed. |
| 5400103  | I/O error.             |
| 5400105  | Service died. Return by callback.          |

**Example**

```ts
import { audio } from '@kit.AudioKit';

let currentCapturerInfo: audio.AudioCapturerChangeInfo;

avRecorder.getCurrentAudioCapturerInfo((err: BusinessError, capturerInfo: audio.AudioCapturerChangeInfo) => {
  if (err) {
    console.error('Failed to get CurrentAudioCapturerInfo and error is ' + err.message);
  } else {
    console.info('Succeeded in getting CurrentAudioCapturerInfo');
    currentCapturerInfo = capturerInfo;
  }
});
```

### getCurrentAudioCapturerInfo<sup>11+</sup>

getCurrentAudioCapturerInfo(): Promise\<audio.AudioCapturerChangeInfo>

Obtains the information about the current audio capturer. This API uses a promise to return the result.

This API can be called only after the **prepare()** API is called. If this API is called after **stop()** is successfully called, an error is reported.

**System capability**: SystemCapability.Multimedia.Media.AVRecorder

**Return value**

| Type                                                        | Description                                             |
| ------------------------------------------------------------ | ------------------------------------------------- |
| Promise\<[audio.AudioCapturerChangeInfo](../apis-audio-kit/js-apis-audio.md#audiocapturerchangeinfo9)> | Promise used to return the audio capturer information.|

**Error codes**

For details about the error codes, see [Media Error Codes](errorcode-media.md).

| ID| Error Message                        |
| -------- | -------------------------------- |
| 5400102  | Operation not allowed.           |
| 5400103  | I/O error.                       |
| 5400105  | Service died. Return by promise. |

**Example**

```ts
import { audio } from '@kit.AudioKit';

let currentCapturerInfo: audio.AudioCapturerChangeInfo;

avRecorder.getCurrentAudioCapturerInfo().then((capturerInfo: audio.AudioCapturerChangeInfo) => {
  console.info('Succeeded in getting CurrentAudioCapturerInfo');
  currentCapturerInfo = capturerInfo;
}).catch((err: BusinessError) => {
  console.error('Failed to get CurrentAudioCapturerInfo and catch error is ' + err.message);
});
```

### getAudioCapturerMaxAmplitude<sup>11+</sup>

getAudioCapturerMaxAmplitude(callback: AsyncCallback\<number>): void

Obtains the maximum amplitude of the current audio capturer. This API uses an asynchronous callback to return the result.

This API can be called only after the **prepare()** API is called. If this API is called after **stop()** is successfully called, an error is reported.

The return value is the maximum amplitude within the duration from the time the maximum amplitude is obtained last time to the current time. For example, if you have obtained the maximum amplitude at 1s and you call this API again at 2s, then the return value is the maximum amplitude within the duration from 1s to 2s.

**System capability**: SystemCapability.Multimedia.Media.AVRecorder

**Parameters**

| Name  | Type                  | Mandatory| Description                                |
| -------- | ---------------------- | ---- | ------------------------------------ |
| callback | AsyncCallback\<number> | Yes  |  Callback used to return the result. If the operation is successful, **err** is **undefined** and **data** is the maximum amplitude obtained; otherwise, **err** is an error object.|

**Error codes**

For details about the error codes, see [Media Error Codes](errorcode-media.md).

| ID| Error Message                                  |
| -------- | ------------------------------------------ |
| 5400102  | Operation not allowed. |
| 5400105  | Service died. Return by callback.          |

**Example**

```ts
let maxAmplitude: number;

avRecorder.getAudioCapturerMaxAmplitude((err: BusinessError, amplitude: number) => {
  if (err) {
    console.error('Failed to get AudioCapturerMaxAmplitude and error is ' + err.message);
  } else {
    console.info('Succeeded in getting AudioCapturerMaxAmplitude');
    maxAmplitude = amplitude;
  }
});
```

### getAudioCapturerMaxAmplitude<sup>11+</sup>

getAudioCapturerMaxAmplitude(): Promise\<number>

Obtains the maximum amplitude of the current audio capturer. This API uses a promise to return the result.

This API can be called only after the **prepare()** API is called. If this API is called after **stop()** is successfully called, an error is reported.

The return value is the maximum amplitude within the duration from the time the maximum amplitude is obtained last time to the current time. For example, if you have obtained the maximum amplitude at 1s and you call this API again at 2s, then the return value is the maximum amplitude within the duration from 1s to 2s.

**System capability**: SystemCapability.Multimedia.Media.AVRecorder

**Return value**

| Type            | Description                                             |
| ---------------- | ------------------------------------------------- |
| Promise\<number>| Promise used to return the maximum amplitude obtained.|

**Error codes**

For details about the error codes, see [Media Error Codes](errorcode-media.md).

| ID| Error Message                        |
| -------- | -------------------------------- |
| 5400102  | Operation not allowed.           |
| 5400105  | Service died. Return by promise. |

**Example**

```ts
let maxAmplitude: number;

avRecorder.getAudioCapturerMaxAmplitude().then((amplitude: number) => {
  console.info('Succeeded in getting AudioCapturerMaxAmplitude');
  maxAmplitude = amplitude;
}).catch((err: BusinessError) => {
  console.error('Failed to get AudioCapturerMaxAmplitude and catch error is ' + err.message);
});
```

### getAvailableEncoder<sup>11+</sup>

getAvailableEncoder(callback: AsyncCallback\<Array\<EncoderInfo>>): void

Obtains available encoders. This API uses an asynchronous callback to return the result.

**System capability**: SystemCapability.Multimedia.Media.AVRecorder

**Parameters**

| Name  | Type                                                 | Mandatory| Description                                |
| -------- | ----------------------------------------------------- | ---- | ------------------------------------ |
| callback | AsyncCallback\<Array\<[EncoderInfo](#encoderinfo11)>> | Yes  | Callback used to return the result. If the operation is successful, **err** is **undefined** and **data** is the available encoders obtained; otherwise, **err** is an error object.|

**Error codes**

For details about the error codes, see [Media Error Codes](errorcode-media.md).

| ID| Error Message                                  |
| -------- | ------------------------------------------ |
| 5400102  | Operation not allowed. |
| 5400105  | Service died. Return by callback.          |

**Example**

```ts
let encoderInfo: media.EncoderInfo;

avRecorder.getAvailableEncoder((err: BusinessError, info: media.EncoderInfo[]) => {
  if (err) {
    console.error('Failed to get AvailableEncoder and error is ' + err.message);
  } else {
    console.info('Succeeded in getting AvailableEncoder');
    encoderInfo = info[0];
  }
});
```

### getAvailableEncoder<sup>11+</sup>

getAvailableEncoder(): Promise\<Array\<EncoderInfo>>

Obtains available encoders. This API uses an asynchronous callback to return the result.

**System capability**: SystemCapability.Multimedia.Media.AVRecorder

**Return value**

| Type                                           | Description                                           |
| ----------------------------------------------- | ----------------------------------------------- |
| Promise\<Array\<[EncoderInfo](#encoderinfo11)>> | Promise used to return the information about the available encoders.|

**Error codes**

For details about the error codes, see [Media Error Codes](errorcode-media.md).

| ID| Error Message                        |
| -------- | -------------------------------- |
| 5400102  | Operation not allowed.           |
| 5400105  | Service died. Return by promise. |

**Example**

```ts
let encoderInfo: media.EncoderInfo;

avRecorder.getAvailableEncoder().then((info: media.EncoderInfo[]) => {
  console.info('Succeeded in getting AvailableEncoder');
  encoderInfo = info[0];
}).catch((err: BusinessError) => {
  console.error('Failed to get AvailableEncoder and catch error is ' + err.message);
});
```

### getAVRecorderConfig<sup>11+</sup>

getAVRecorderConfig(callback: AsyncCallback\<AVRecorderConfig>): void

Obtains the real-time configuration of this AVRecorder. This API uses an asynchronous callback to return the result.

This API can be called only after [prepare()](#prepare9-2) is called.

**System capability**: SystemCapability.Multimedia.Media.AVRecorder

**Parameters**

| Name  | Type                  | Mandatory| Description                       |
| -------- | ---------------------- | ---- | --------------------------- |
| callback | AsyncCallback\<[AVRecorderConfig](#avrecorderconfig9)> | Yes  | Callback used to return the result. If the operation is successful, **err** is **undefined** and **data** is the real-time configuration obtained; otherwise, **err** is an error object.|

**Error codes**

For details about the error codes, see [Media Error Codes](errorcode-media.md).

| ID| Error Message                                  |
| -------- | ------------------------------------------ |
| 5400102  | Operate not permit. Return by callback. |
| 5400103  | IO error. Return by callback.             |
| 5400105  | Service died. Return by callback.          |

**Example**

```ts
import { BusinessError } from '@kit.BasicServicesKit';

let avConfig: media.AVRecorderConfig;

avRecorder.getAVRecorderConfig((err: BusinessError, config: media.AVRecorderConfig) => {
  if (err) {
    console.error('Failed to get avConfig and error is ' + err.message);
  } else {
    console.info('Succeeded in getting AVRecorderConfig');
    avConfig = config;
  }
});
```

### getAVRecorderConfig<sup>11+</sup>

getAVRecorderConfig(): Promise\<AVRecorderConfig>;

Obtains the real-time configuration of this AVRecorder. This API uses a promise to return the result.

This API can be called only after [prepare()](#prepare9-3) is called.

**System capability**: SystemCapability.Multimedia.Media.AVRecorder

**Return value**

| Type            | Description                            |
| ---------------- | -------------------------------- |
| Promise\<[AVRecorderConfig](#avrecorderconfig9)> | Promise used to return the real-time configuration.|

**Error codes**

For details about the error codes, see [Media Error Codes](errorcode-media.md).

| ID| Error Message                                 |
| -------- | ----------------------------------------- |
| 5400102  | Operate not permit. Return by promise. |
| 5400103  | IO error. Return by promise.             |
| 5400105  | Service died. Return by promise.          |

**Example**

```ts
import { BusinessError } from '@kit.BasicServicesKit';

let avConfig: media.AVRecorderConfig;

avRecorder.getAVRecorderConfig().then((config: media.AVRecorderConfig) => {
  console.info('Succeeded in getting AVRecorderConfig');
  avConfig = config;
}).catch((err: BusinessError) => {
  console.error('Failed to get AVRecorderConfig and catch error is ' + err.message);
});
```

### on('stateChange')<sup>9+</sup>

on(type: 'stateChange', callback: OnAVRecorderStateChangeHandler): void

Subscribes to AVRecorder state changes. An application can subscribe to only one AVRecorder state change event. When the application initiates multiple subscriptions to this event, the last subscription prevails.

**Atomic service API**: This API can be used in atomic services since API version 12.

**System capability**: SystemCapability.Multimedia.Media.AVRecorder

**Parameters**

| Name  | Type    | Mandatory| Description                                                        |
| -------- | -------- | ---- | ------------------------------------------------------------ |
| type     | string   | Yes  | Event type, which is **'stateChange'** in this case. This event can be triggered by both user operations and the system.|
| callback | [OnAVRecorderStateChangeHandler](#onavrecorderstatechangehandler12) | Yes  | Callback invoked when the event is triggered.|

**Error codes**

For details about the error codes, see [Media Error Codes](errorcode-media.md).

| ID| Error Message                         |
| -------- | --------------------------------- |
| 5400103  | IO error. Return by callback.     |
| 5400105  | Service died. Return by callback. |

**Example**

```ts
avRecorder.on('stateChange', async (state: media.AVRecorderState, reason: media.StateChangeReason) => {
  console.info('case state has changed, new state is :' + state + ',and new reason is : ' + reason);
});
```

### off('stateChange')<sup>9+</sup>

off(type: 'stateChange', callback?: OnAVRecorderStateChangeHandler): void

Unsubscribes from AVRecorder state changes.

**Atomic service API**: This API can be used in atomic services since API version 12.

**System capability**: SystemCapability.Multimedia.Media.AVRecorder

**Parameters**

| Name| Type  | Mandatory| Description                                                        |
| ------ | ------ | ---- | ------------------------------------------------------------ |
| type   | string | Yes  | Event type, which is **'stateChange'** in this case. This event can be triggered by both user operations and the system.|
| callback | [OnAVRecorderStateChangeHandler](#onavrecorderstatechangehandler12) | No  | Callback invoked when the event is triggered.<br>This parameter is supported since API version 12.|

**Example**

```ts
avRecorder.off('stateChange');
```

### on('error')<sup>9+</sup>

on(type: 'error', callback: ErrorCallback): void

Subscribes to AVRecorder errors. This event is used only for error prompt and does not require the user to stop recording control. If the [AVRecorderState](#avrecorderstate9) is also switched to error, call [reset()](#reset9-2) or [release()][release()](#release9-2) to exit the recording.

An application can subscribe to only one AVRecorder error event. When the application initiates multiple subscriptions to this event, the last subscription prevails.

**Atomic service API**: This API can be used in atomic services since API version 12.

**System capability**: SystemCapability.Multimedia.Media.AVRecorder

**Parameters**

| Name  | Type         | Mandatory| Description                                                        |
| -------- | ------------- | ---- | ------------------------------------------------------------ |
| type     | string        | Yes  | Event type, which is **'error'** in this case.<br>This event is triggered when an error occurs during recording.|
| callback | [ErrorCallback](../apis-basic-services-kit/js-apis-base.md#errorcallback) | Yes  | Callback invoked when the event is triggered.                                      |

**Error codes**

For details about the error codes, see [Media Error Codes](errorcode-media.md).

| ID| Error Message                                  |
| -------- | ------------------------------------------ |
| 201      | Permission denied.     |
| 401      | Parameter error. Possible causes: 1. Mandatory parameters are left unspecified. 2. Incorrect parameter types. 3.Parameter verification failed. |
| 801      | Capability not supported. |
| 5400101  | No memory.             |
| 5400102  | Operation not allowed. |
| 5400103  | I/O error.             |
| 5400104  | Time out.              |
| 5400105  | Service died.          |
| 5400106  | Unsupported format.    |
| 5400107  | Audio interrupted.     |

**Example**

```ts
import { BusinessError } from '@kit.BasicServicesKit';

avRecorder.on('error', (err: BusinessError) => {
  console.info('case avRecorder.on(error) called, errMessage is ' + err.message);
});
```

### off('error')<sup>9+</sup>

off(type: 'error', callback?: ErrorCallback): void

Unsubscribes from AVRecorder errors. After the unsubscription, your application can no longer receive AVRecorder errors.

**Atomic service API**: This API can be used in atomic services since API version 12.

**System capability**: SystemCapability.Multimedia.Media.AVRecorder

**Parameters**

| Name| Type  | Mandatory| Description                                                        |
| ------ | ------ | ---- | ------------------------------------------------------------ |
| type   | string | Yes  | Event type, which is **'error'** in this case.<br>This event is triggered when an error occurs during recording.|
| callback | [ErrorCallback](../apis-basic-services-kit/js-apis-base.md#errorcallback) | No  | Callback invoked when the event is triggered.<br>This parameter is supported since API version 12.                  |

**Example**

```ts
avRecorder.off('error');
```

### on('audioCapturerChange')<sup>11+</sup>

on(type: 'audioCapturerChange', callback: Callback<audio.AudioCapturerChangeInfo>): void

Subscribes to audio capturer configuration changes. Any configuration change triggers the callback that returns the entire configuration information.

When the application initiates multiple subscriptions to this event, the last subscription prevails.

**System capability**: SystemCapability.Multimedia.Media.AVRecorder

**Parameters**

| Name  | Type    | Mandatory| Description                                                        |
| -------- | -------- | ---- | ------------------------------------------------------------ |
| type     | string   | Yes  |Event type, which is **'audioCapturerChange'** in this case.|
| callback | Callback<[audio.AudioCapturerChangeInfo](../apis-audio-kit/js-apis-audio.md#audiocapturerchangeinfo9)> | Yes| Callback used to return the entire configuration information about the audio capturer.|

**Error codes**

| ID| Error Message                                  |
| -------- | ------------------------------------------ |
| 401      | Parameter error. Possible causes: 1. Mandatory parameters are left unspecified. 2. Incorrect parameter types. 3.Parameter verification failed.      |

**Example**

```ts
import { audio } from '@kit.AudioKit'

let capturerChangeInfo: audio.AudioCapturerChangeInfo;

avRecorder.on('audioCapturerChange',  (audioCapturerChangeInfo: audio.AudioCapturerChangeInfo) => {
  console.info('audioCapturerChange called');
  capturerChangeInfo = audioCapturerChangeInfo;
});
```

### off('audioCapturerChange')<sup>11+</sup>

off(type: 'audioCapturerChange', callback?: Callback<audio.AudioCapturerChangeInfo>): void

Subscribes to audio capturer configuration changes.

**System capability**: SystemCapability.Multimedia.Media.AVRecorder

**Parameters**

| Name| Type  | Mandatory| Description                                                        |
| ------ | ------ | ---- | ------------------------------------------------------------ |
| type   | string | Yes  | Event type, which is **'audioCapturerChange'** in this case.|
| callback | Callback<[audio.AudioCapturerChangeInfo](../apis-audio-kit/js-apis-audio.md#audiocapturerchangeinfo9)> | No| Callback used to return the entire configuration information about the audio capturer.<br>This parameter is supported since API version 12.|

**Example**

```ts
avRecorder.off('audioCapturerChange');
```

### on('photoAssetAvailable')<sup>12+</sup>

on(type: 'photoAssetAvailable', callback: Callback\<photoAccessHelper.PhotoAsset>): void

Subscribes to media asset callback events. When [FileGenerationMode](#filegenerationmode12) is used during media file creation, the [PhotoAsset](../apis-media-library-kit/js-apis-photoAccessHelper.md#photoasset) object is called back to the application after the [stop](#stop9-2) operation is complete.

When the application initiates multiple subscriptions to this event, the last subscription prevails.

**System capability**: SystemCapability.Multimedia.Media.AVRecorder

**Parameters**

| Name  | Type    | Mandatory| Description                                                        |
| -------- | -------- | ---- | ------------------------------------------------------------ |
| type     | string   | Yes  |Event type, which is **'photoAssetAvailable'** in this case. The event is triggered when a photo asset is available.|
| callback | Callback<[photoAccessHelper.PhotoAsset](../apis-media-library-kit/js-apis-photoAccessHelper.md#photoasset)> | Yes| Callback used to return the **PhotoAsset** object corresponding to the resource file created by the system.|

**Error codes**

| ID| Error Message                                  |
| -------- | ------------------------------------------ |
| 5400103  | IO error. Return by callback.             |
| 5400105  | Service died. Return by callback.          |

**Example**

```ts
import { photoAccessHelper } from '@kit.MediaLibraryKit';
import { common } from '@kit.AbilityKit'
let photoAsset: photoAccessHelper.PhotoAsset;
let context = getContext(this) as common.UIAbilityContext

// Example: Process the photoAsset callback and save the video.
async function saveVideo(asset: photoAccessHelper.PhotoAsset) {
  console.info("saveVideo called");
  try {
    let phAccessHelper = photoAccessHelper.getPhotoAccessHelper(context);
    let assetChangeRequest: photoAccessHelper.MediaAssetChangeRequest = new photoAccessHelper.MediaAssetChangeRequest(asset);
    assetChangeRequest.saveCameraPhoto();
    await phAccessHelper.applyChanges(assetChangeRequest);
    console.info('apply saveVideo successfully');
  } catch (err) {
    console.error(`apply saveVideo failed with error: ${err.code}, ${err.message}`);
  }
}
// Subscribe to the photoAsset event.
avRecorder.on('photoAssetAvailable',  (asset: photoAccessHelper.PhotoAsset) => {
  console.info('photoAssetAvailable called');
  if (asset != undefined) {
    photoAsset = asset;
    // Process the photoAsset callback.
    // Example: this.saveVideo (asset);
  } else {
    console.error('photoAsset is undefined');
  }
});
```

### off('photoAssetAvailable')<sup>12+</sup>

off(type: 'photoAssetAvailable', callback?: Callback<photoAccessHelper.PhotoAsset>): void

Unsubscribes from media asset callback events.

**System capability**: SystemCapability.Multimedia.Media.AVRecorder

**Parameters**

| Name| Type  | Mandatory| Description                                                        |
| ------ | ------ | ---- | ------------------------------------------------------------ |
| type   | string | Yes  | Event type, which is **'photoAssetAvailable'** in this case.|

**Example**

```ts
avRecorder.off('photoAssetAvailable');
```

## AVRecorderState<sup>9+</sup>

type AVRecorderState = 'idle' | 'prepared' | 'started' | 'paused' | 'stopped' | 'released' | 'error'

Enumerates the AVRecorder states. You can obtain the state through the **state** attribute.

**Atomic service API**: This API can be used in atomic services since API version 12.

**System capability**: SystemCapability.Multimedia.Media.AVRecorder

| Type    | Description                                                        |
| -------- | ------------------------------------------------------------ |
| 'idle'     | The AVRecorder enters this state after it is just created or the [AVRecorder.reset()](#reset9-2) API is called when the AVRecorder is in any state except released. In this state, you can call [AVRecorder.prepare()](#prepare9-2) to set recording parameters.  |
| 'prepared' | The AVRecorder enters this state when the parameters are set. In this state, you can call [AVRecorder.start()](#start9) to start recording.|
| 'started'  | The AVRecorder enters this state when the recording starts. In this state, you can call [AVRecorder.pause()](#pause9-2) to pause recording or call [AVRecorder.stop()](#stop9-2) to stop recording.|
| 'paused'   | The AVRecorder enters this state when the recording is paused. In this state, you can call [AVRecorder.resume()](#resume9) to continue recording or call [AVRecorder.stop()](#stop9-2) to stop recording.|
| 'stopped'  | The AVRecorder enters this state when the recording stops. In this state, you can call [AVRecorder.prepare()](#prepare9-2) to set recording parameters so that the AVRecorder enters the prepared state again.|
| 'released' | The AVRecorder enters this state when the recording resources are released. In this state, no operation can be performed. In any other state, you can call [AVRecorder.release()](#release9-2) to enter the released state.|
| 'error'    | The AVRecorder enters this state when an irreversible error occurs in the **AVRecorder** instance. In this state, the [AVRecorder.on('error') event](#onerror9-1) is reported, with the detailed error cause. In the error state, you must call [AVRecorder.reset()](#reset9-2) to reset the **AVRecorder** instance or call [AVRecorder.release()](#release9-2) to release the resources.|

## OnAVRecorderStateChangeHandler<sup>12+</sup>

type OnAVRecorderStateChangeHandler = (state: AVRecorderState, reason: StateChangeReason) => void

Describes the callback invoked for the AVRecorder state change event. 

**Atomic service API**: This API can be used in atomic services since API version 12.

**System capability**: SystemCapability.Multimedia.Media.AVPlayer

| Name  | Type  | Mandatory| Description                                                        |
| ------ | ------ | ------ | ------------------------------------------------------------ |
| state  | [AVRecorderState](#avrecorderstate9) | Mandatory| AVRecorder state.    |
| reason | [StateChangeReason](#statechangereason9) | Mandatory| Reason for the state change.|

## AVRecorderConfig<sup>9+</sup>

Describes the audio and video recording parameters.

The **audioSourceType** and **videoSourceType** parameters are used to distinguish audio-only recording, video-only recording, and audio and video recording. For audio-only recording, set only **audioSourceType**. For video-only recording, set only **videoSourceType**. For audio and video recording, set both **audioSourceType** and **videoSourceType**.

**System capability**: SystemCapability.Multimedia.Media.AVRecorder

| Name           | Type                                    | Mandatory| Description                                                        |
| --------------- | ---------------------------------------- | ---- | ------------------------------------------------------------ |
| audioSourceType | [AudioSourceType](#audiosourcetype9)     | No  | Type of the audio source to record. This parameter is mandatory for audio recording.<br>**Atomic service API**: This API can be used in atomic services since API version 12.|
| videoSourceType | [VideoSourceType](#videosourcetype9)     | No  | Type of the video source to record. This parameter is mandatory for video recording.                  |
| profile         | [AVRecorderProfile](#avrecorderprofile9) | Yes  | Recording profile. This parameter is mandatory.<br>**Atomic service API**: This API can be used in atomic services since API version 12.|
| url             | string                                   | Yes  | Recording output URL: fd://xx (fd number).<br>![img](figures/en-us_image_url.png)<br>This parameter is mandatory.<br>**Atomic service API**: This API can be used in atomic services since API version 12.|
|fileGenerationMode<sup>12+</sup> | [FileGenerationMode](#filegenerationmode12)  | No  |  Mode for creating the file, which is used together with [on('photoAssetAvailable')](#onphotoassetavailable12).|
| rotation<sup>(deprecated)</sup>        | number                                   | No  | Rotation angle of the recorded video. The value can be 0 (default), 90, 180, or 270 for MP4 videos.<br>This API is supported since API version 6 and deprecated since API version 12. You are advised to use **[AVMetadata](#avmetadata11).videoOrientation** instead. If both parameters are set, **[AVMetadata](#avmetadata11).videoOrientation** is used.    |
| location<sup>(deprecated)</sup>        | [Location](#location)                    | No  | Geographical location of the recorded video. By default, the geographical location information is not recorded.<br>This API is supported since API version 6 and deprecated since API version 12. You are advised to use **[AVMetadata](#avmetadata11).location** instead. If both parameters are set, **[AVMetadata](#avmetadata11).location** is used.|
| metadata<sup>12+</sup>        | [AVMetadata](#avmetadata11)              | No  | Metadata. For details, see [AVMetadata](#avmetadata11).                 |

## AVRecorderProfile<sup>9+</sup>

Describes the audio and video recording profile.

**System capability**: SystemCapability.Multimedia.Media.AVRecorder

| Name            | Type                                        | Mandatory| Description                                                        |
| ---------------- | -------------------------------------------- | ---- | ------------------------------------------------------------ |
| audioBitrate     | number                                       | No  | Audio encoding bit rate. This parameter is mandatory for audio recording.<br>Supported bit rate ranges:<br>- Range [32000 - 500000] for the AAC encoding format.<br>- Range [64000 - 64000] for the G.711 μ-law encoding format.<br>- Range [8000, 16000, 32000, 40000, 48000, 56000, 64000, 80000, 96000, 112000, 128000, 160000, 192000, 224000, 256000, 320000] for the MP3 encoding format.<br>When the MP3 encoding format is used, the mapping between the sampling rate and bit rate is as follows:<br>- When the sampling rate is lower than 16 kHz, the bit rate range is [8 kbit/s - 64 kbit/s].<br>- When the sampling rate ranges from 16 kHz to 32 kHz, the bit rate range is [8 kbit/s - 160 kbit/s].<br>- When the sampling rate is greater than 32 kHz, the bit rate range is [32 kbit/s - 320 kbit/s].<br>**Atomic service API**: This API can be used in atomic services since API version 12.|
| audioChannels    | number                                       | No  | Number of audio channels. This parameter is mandatory for audio recording.<br>- Range [1 - 8] for the AAC encoding format.<br>- Range [1 - 1] for the G.711 μ-law encoding format.<br>- Range [1 - 2] for the MP3 encoding format.<br>**Atomic service API**: This API can be used in atomic services since API version 12.      |
| audioCodec       | [CodecMimeType](#codecmimetype8)             | No  | Audio encoding format. This parameter is mandatory for audio recording. Currently, **AUDIO_AAC**, **AUDIO_MP3**, and **AUDIO_G711MU** are supported.<br>**Atomic service API**: This API can be used in atomic services since API version 12.    |
| audioSampleRate  | number                                       | No  | Audio sampling rate. This parameter is mandatory for audio recording.<br>Supported sampling rate ranges:<br>- Range [8000, 11025, 12000, 16000, 22050, 24000, 32000, 44100, 48000, 64000, 88200, 96000] for the AAC encoding format.<br>- Range [8000 - 8000] for the G.711 μ-law encoding format.<br>- Range [8000, 11025, 12000, 16000, 22050, 24000, 32000, 44100, 48000] for the MP3 encoding format.<br>Variable bit rate. The bit rate is for reference only.<br>**Atomic service API**: This API can be used in atomic services since API version 12.|
| fileFormat       | [ContainerFormatType](#containerformattype8) | Yes  | Container format of a file. This parameter is mandatory. Currently, the MP4, M4A, MP3, and WAV container formats are supported. The AUDIO_MP3 encoding format cannot be used in the MP4 container format.<br>**Atomic service API**: This API can be used in atomic services since API version 12.|
| videoBitrate     | number                                       | No  | Video encoding bit rate. This parameter is mandatory for video recording. The value range is [10000 - 100000000]. |
| videoCodec       | [CodecMimeType](#codecmimetype8)             | No  | Video encoding format. This parameter is mandatory for video recording. Currently, VIDEO_AVC is supported.|
| videoFrameWidth  | number                                       | No  | Width of a video frame. This parameter is mandatory for video recording. The value range is [176 - 4096].        |
| videoFrameHeight | number                                       | No  | Height of a video frame. This parameter is mandatory for video recording. The value range is [144 - 4096].        |
| videoFrameRate   | number                                       | No  | Video frame rate. This parameter is mandatory for video recording. The value range is [1 - 60].            |
| isHdr<sup>11+</sup>            | boolean                        | No  | HDR encoding. This parameter is optional for video recording. The default value is **false**, and there is no requirement on the encoding format. When **isHdr** is set to **true**, the encoding format must be **video/hevc**.|
| enableTemporalScale<sup>12+</sup>            | boolean                        | No  | Whether temporal layered encoding is supported. This parameter is optional for video recording. The default value is **false**. If this parameter is set to **true**, some frames in the video output streams can be skipped without being encoded.|

## AudioSourceType<sup>9+</sup>

Enumerates the audio source types for video recording.

**System capability**: SystemCapability.Multimedia.Media.AVRecorder

| Name                     | Value  | Description                  |
| ------------------------- | ---- | ---------------------- |
| AUDIO_SOURCE_TYPE_DEFAULT | 0    | Default audio input source.|
| AUDIO_SOURCE_TYPE_MIC     | 1    | Microphone audio input source.<br>**Atomic service API**: This API can be used in atomic services since API version 12.|
| AUDIO_SOURCE_TYPE_VOICE_RECOGNITION<sup>12+</sup> | 2    | Audio source in speech recognition scenarios.|
| AUDIO_SOURCE_TYPE_VOICE_COMMUNICATION<sup>12+</sup>     | 7    | Voice communication source.|
| AUDIO_SOURCE_TYPE_VOICE_MESSAGE<sup>12+</sup> | 10    | Voice message source.|
| AUDIO_SOURCE_TYPE_CAMCORDER<sup>12+</sup>     | 13    | Audio source in camera recording scenarios.|

## VideoSourceType<sup>9+</sup>

Enumerates the video source types for video recording.

**System capability**: SystemCapability.Multimedia.Media.AVRecorder

| Name                         | Value  | Description                           |
| ----------------------------- | ---- | ------------------------------- |
| VIDEO_SOURCE_TYPE_SURFACE_YUV | 0    | The input surface carries raw data.|
| VIDEO_SOURCE_TYPE_SURFACE_ES  | 1    | The input surface carries ES data. |

## ContainerFormatType<sup>8+</sup>

Enumerates the container format types (CFTs).

**System capability**: SystemCapability.Multimedia.Media.Core

| Name       | Value   | Description                 |
| ----------- | ----- | --------------------- |
| CFT_MPEG_4  | 'mp4' | Video container format MP4.|
| CFT_MPEG_4A | 'm4a' | Audio container format M4A.<br>**Atomic service API**: This API can be used in atomic services since API version 12.|
| CFT_MP3<sup>12+</sup>  | 'mp3' | Audio container format MP3.|
| CFT_WAV<sup>12+</sup>  | 'wav' | Audio container format WAV.|

## Location

Describes the geographical location of the recorded video.

**System capability**: SystemCapability.Multimedia.Media.Core

| Name     | Type  | Mandatory| Description            |
| --------- | ------ | ---- | ---------------- |
| latitude  | number | Yes  | Latitude of the geographical location.|
| longitude | number | Yes  | Longitude of the geographical location.|

## EncoderInfo<sup>11+</sup>

Describes the information about an encoder.

**System capability**: SystemCapability.Multimedia.Media.AVRecorder

| Name      | Type                            | Readable| Writable| Description                                                        |
| ---------- | -------------------------------- | ---- | ---- | ------------------------------------------------------------ |
| mimeType   | [CodecMimeType](#codecmimetype8) | Yes  | No  | MIME type of the encoder.                                          |
| type       | string                           | Yes  | No  | Encoder type. The value **audio** means an audio encoder, and **video** means a video encoder.        |
| bitRate    | [Range](#range11)                | Yes  | No  | Bit rate range of the encoder, with the minimum and maximum bit rates specified.                          |
| frameRate  | [Range](#range11)                | Yes  | No  | Video frame rate range, with the minimum and maximum frame rates specified. This parameter is available only for video encoders.          |
| width      | [Range](#range11)                | Yes  | No  | Video frame width range, with the minimum and maximum widths specified. This parameter is available only for video encoders.      |
| height     | [Range](#range11)                | Yes  | No  | Video frame height range, with the minimum and maximum heights specified. This parameter is available only for video encoders.      |
| channels   | [Range](#range11)                | Yes  | No  | Number of audio channels for the audio capturer, with the minimum and maximum numbers of audio channels specified. This parameter is available only for audio encoders.  |
| sampleRate | Array\<number>                    | Yes  | No  | Audio sampling rate, including all available audio sampling rates. This parameter is available only for audio encoders.|

## Range<sup>11+</sup>

Describes a range.

**System capability**: SystemCapability.Multimedia.Media.AVRecorder

| Name| Type  | Readable| Writable| Description        |
| ---- | ------ | ---- | ---- | ------------ |
| min  | number | Yes  | No  | Minimum value.|
| max  | number | Yes  | No  | Maximum value.|

## FileGenerationMode<sup>12+</sup>

Enumerates the modes for creating media files.

**System capability**: SystemCapability.Multimedia.Media.AVRecorder

| Name                         | Value  | Description                           |
| ----------------------------- | ---- | ------------------------------- |
| APP_CREATE  | 0    | The application creates a media file in the sandbox.|
| AUTO_CREATE_CAMERA_SCENE  | 1    | The system creates a media file. Currently, this mode takes effect only in camera recording scenarios. The URL set by the application is ignored.|

## AVTranscoder<sup>12+</sup>

A transcoding management class that provides APIs to transcode videos. Before calling any API in **AVTranscoder**, you must use **createAVTranscoder()** to create an **AVTranscoder** instance.

For details about the AVTranscoder demo, see [Using AVTranscoder for Transcoding](../../media/media/using-avtranscoder-for-transcodering.md).

### Attributes

**System capability**: SystemCapability.Multimedia.Media.AVTranscoder

| Name   | Type                                | Read-Only| Optional| Description              |
| ------- | ------------------------------------ | ---- | ---- | ------------------ |
| fdSrc<sup>12+</sup>                                  | [AVFileDescriptor](#avfiledescriptor9)                       |  No | No  | Source media file descriptor, which specifies the data source.<br>**Example:**<br>There is a media file that stores continuous assets, the address offset is 0, and the byte length is 100. Its file descriptor is **AVFileDescriptor {fd = resourceHandle; offset = 0; length = 100; }**.<br>**NOTE**<br> - After the resource handle (FD) is transferred to an **AVTranscoder** instance, do not use the resource handle to perform other read and write operations, including but not limited to transferring this handle to other **AVPlayer**, **AVMetadataExtractor**, **AVImageGenerator**, or **AVTranscoder** instance. Competition occurs when multiple AVTranscoders use the same resource handle to read and write files at the same time, resulting in errors in obtaining data.|
| fdDst<sup>12+</sup>                               | number                 |  No | No  | Destination media file descriptor, which specifies the data source. After creating an **AVTranscoder** instance, you must set both **fdSrc** and **fdDst**.<br>**NOTE**<br> - After the resource handle (FD) is transferred to an **AVTranscoder** instance, do not use the resource handle to perform other read and write operations, including but not limited to transferring this handle to other **AVPlayer**, **AVMetadataExtractor**, **AVImageGenerator**, or **AVTranscoder** instance. Competition occurs when multiple AVTranscoders use the same resource handle to read and write files at the same time, resulting in errors in obtaining data.|

### prepare<sup>12+</sup>

prepare(config: AVTranscoderConfig): Promise\<void>

Sets video transcoding parameters. This API uses a promise to return the result.

**System capability**: SystemCapability.Multimedia.Media.AVTranscoder

**Parameters**

| Name| Type                                  | Mandatory| Description                      |
| ------ | -------------------------------------- | ---- | -------------------------- |
| config | [AVTranscoderConfig](#avtranscoderconfig12) | Yes  | Video transcoding parameters to set.|

**Return value**

| Type          | Description                                      |
| -------------- | ------------------------------------------ |
| Promise\<void> | Promise that returns no value.|

**Error codes**

For details about the error codes, see [Media Error Codes](errorcode-media.md).

| ID| Error Message                              |
| -------- | -------------------------------------- |
| 401  | The parameter check failed. Return by promise. |
| 5400102  | Operation not allowed. Return by promise. |
| 5400105  | Service died. Return by promise.       |
| 5400106  | Unsupported format. Returned by promise.  |

**Example**

```ts
import { BusinessError } from '@kit.BasicServicesKit';

// Configure the parameters based on those supported by the hardware device.
let avTranscoderConfig: media.AVTranscoderConfig = {
  audioBitrate : 200000,
  audioCodec : media.CodecMimeType.AUDIO_AAC,
  fileFormat : media.ContainerFormatType.CFT_MPEG_4,
  videoBitrate : 3000000,
  videoCodec : media.CodecMimeType.VIDEO_AVC,
  videoFrameWidth : 1280,
  videoFrameHeight : 720,
}

avTranscoder.prepare(avTranscoderConfig).then(() => {
  console.info('prepare success');
}).catch((err: BusinessError) => {
  console.error('prepare failed and catch error is ' + err.message);
});
```

### start<sup>12+</sup>

start(): Promise\<void>

Starts transcoding. This API uses a promise to return the result.

This API can be called only after the [prepare()](#prepare12) API is called.

**System capability**: SystemCapability.Multimedia.Media.AVTranscoder

**Return value**

| Type          | Description                                 |
| -------------- | ------------------------------------- |
| Promise\<void> | Promise that returns no value.|

**Error codes**

For details about the error codes, see [Media Error Codes](errorcode-media.md).

| ID| Error Message                              |
| -------- | -------------------------------------- |
| 5400102  | Operation not allowed. Return by promise. |
| 5400103  | IO error. Return by promise.           |
| 5400105  | Service died. Return by promise.       |

**Example**

```ts
import { BusinessError } from '@kit.BasicServicesKit';

avTranscoder.start().then(() => {
  console.info('start AVTranscoder success');
}).catch((err: BusinessError) => {
  console.error('start AVTranscoder failed and catch error is ' + err.message);
});
```

### pause<sup>12+</sup>

pause(): Promise\<void>

Pauses transcoding. This API uses a promise to return the result.

This API can be called only after the [start()](#start12) API is called. You can call [resume()](#resume12) to resume transcoding.

**System capability**: SystemCapability.Multimedia.Media.AVTranscoder

**Return value**

| Type          | Description                                 |
| -------------- | ------------------------------------- |
| Promise\<void> | Promise that returns no value.|

**Error codes**

For details about the error codes, see [Media Error Codes](errorcode-media.md).

| ID| Error Message                              |
| -------- | -------------------------------------- |
| 5400102  | Operation not allowed. Return by promise. |
| 5400103  | IO error. Return by promise.           |
| 5400105  | Service died. Return by promise.       |

**Example**

```ts
import { BusinessError } from '@kit.BasicServicesKit';

avTranscoder.pause().then(() => {
  console.info('pause AVTranscoder success');
}).catch((err: BusinessError) => {
  console.error('pause AVTranscoder failed and catch error is ' + err.message);
});
```

### resume<sup>12+</sup>

resume(): Promise\<void>

Resumes transcoding. This API uses a promise to return the result.

This API can be called only after the [pause()](#pause12) API is called.

**System capability**: SystemCapability.Multimedia.Media.AVTranscoder

**Return value**

| Type          | Description                                 |
| -------------- | ------------------------------------- |
| Promise\<void> | Promise that returns no value.|

**Error codes**

For details about the error codes, see [Media Error Codes](errorcode-media.md).

| ID| Error Message                              |
| -------- | -------------------------------------- |
| 5400102  | Operation not allowed. Return by promise. |
| 5400103  | IO error. Return by promise.           |
| 5400105  | Service died. Return by promise.       |

**Example**

```ts
import { BusinessError } from '@kit.BasicServicesKit';

avTranscoder.resume().then(() => {
  console.info('resume AVTranscoder success');
}).catch((err: BusinessError) => {
  console.error('resume AVTranscoder failed and catch error is ' + err.message);
});
```

### cancel<sup>12+</sup>

cancel(): Promise\<void>

Cancels transcoding. This API uses a promise to return the result.

This API can be called only after the [prepare()](#prepare12), [start()](#start12), [pause()](#pause12), or [resume()](#resume12) API is called.

**System capability**: SystemCapability.Multimedia.Media.AVTranscoder

**Return value**

| Type          | Description                                 |
| -------------- | ------------------------------------- |
| Promise\<void> | Promise that returns no value.|

**Error codes**

For details about the error codes, see [Media Error Codes](errorcode-media.md).

| ID| Error Message                              |
| -------- | -------------------------------------- |
| 5400102  | Operation not allowed. Return by promise. |
| 5400103  | IO error. Return by promise.           |
| 5400105  | Service died. Return by promise.       |

**Example**

```ts
import { BusinessError } from '@kit.BasicServicesKit';

avTranscoder.cancel().then(() => {
  console.info('cancel AVTranscoder success');
}).catch((err: BusinessError) => {
  console.error('cancel AVTranscoder failed and catch error is ' + err.message);
});
```

### release<sup>12+</sup>

release(): Promise\<void>

Releases the video transcoding resources. This API uses a promise to return the result.

After the resources are released, you can no longer perform any operation on the **AVTranscoder** instance.

**System capability**: SystemCapability.Multimedia.Media.AVTranscoder

**Return value**

| Type          | Description                                       |
| -------------- | ------------------------------------------- |
| Promise\<void> | Promise that returns no value.|

**Error codes**

For details about the error codes, see [Media Error Codes](errorcode-media.md).

| ID| Error Message                         |
| -------- | --------------------------------- |
| 5400102  | Operation not allowed. Return by promise. |
| 5400105  | Service died. Return by promise. |

**Example**

```ts
import { BusinessError } from '@kit.BasicServicesKit';

avTranscoder.release().then(() => {
  console.info('release AVTranscoder success');
}).catch((err: BusinessError) => {
  console.error('release AVTranscoder failed and catch error is ' + err.message);
});
```

### on('progressUpdate')<sup>12+</sup>

on(type: 'progressUpdate', callback: Callback\<number>): void

Subscribes to transcoding progress updates. An application can subscribe to only one transcoding progress update event. When the application initiates multiple subscriptions to this event, the last subscription prevails.

**System capability**: SystemCapability.Multimedia.Media.AVTranscoder

**Parameters**

| Name  | Type    | Mandatory| Description                                                        |
| -------- | -------- | ---- | ------------------------------------------------------------ |
| type     | string   | Yes  | Event type, which is **'progressUpdate'** in this case. This event is triggered by the system during transcoding.|
| callback | [Callback](../apis-basic-services-kit/js-apis-base.md#callback) | Yes  | Callback invoked when the event is triggered. **progress** is a number that indicates the current transcoding progress.|

**Example**

```ts
avTranscoder.on('progressUpdate', (progress: number) => {
  console.info('avTranscoder progressUpdate = ' + progress);
});
```

### off('progressUpdate')<sup>12+</sup>

off(type:'progressUpdate', callback?: Callback\<number>): void

Unsubscribes from transcoding progress updates.

**System capability**: SystemCapability.Multimedia.Media.AVTranscoder

**Parameters**

| Name| Type  | Mandatory| Description                                                        |
| ------ | ------ | ---- | ------------------------------------------------------------ |
| type   | string | Yes  | Event type, which is **'progressUpdate'** in this case. This event can be triggered by both user operations and the system.|
| callback | [Callback](../apis-basic-services-kit/js-apis-base.md#callback) | No  | Called that has been registered to listen for progress updates. You are advised to use the default value because only the last registered callback is retained in the current callback mechanism.|

**Example**

```ts
avTranscoder.off('progressUpdate');
```

### on('error')<sup>12+</sup>

on(type: 'error', callback: ErrorCallback): void

Subscribes to AVTranscoder errors. If this event is reported, call [release()](#release12) to exit the transcoding.

An application can subscribe to only one AVTranscoder error event. When the application initiates multiple subscriptions to this event, the last subscription prevails.

**System capability**: SystemCapability.Multimedia.Media.AVTranscoder

**Parameters**

| Name  | Type         | Mandatory| Description                                                        |
| -------- | ------------- | ---- | ------------------------------------------------------------ |
| type     | string        | Yes  | Event type, which is **'error'** in this case.<br>This event is triggered when an error occurs during recording.|
| callback | [ErrorCallback](../apis-basic-services-kit/js-apis-base.md#errorcallback) | Yes  | Callback invoked when the event is triggered.                                      |

**Error codes**

For details about the error codes, see [Media Error Codes](errorcode-media.md).

| ID| Error Message                                  |
| -------- | ------------------------------------------ |
| 401      | The parameter check failed. |
| 801      | Capability not supported. |
| 5400101  | No memory.            |
| 5400102  | Operation not allowed. |
| 5400103  | I/O error.              |
| 5400104  | Time out.            |
| 5400105  | Service died.           |
| 5400106  | Unsupported format.      |

**Example**

```ts
import { BusinessError } from '@kit.BasicServicesKit';

avTranscoder.on('error', (err: BusinessError) => {
  console.info('case avTranscoder.on(error) called, errMessage is ' + err.message);
});
```

### off('error')<sup>12+</sup>

off(type:'error', callback?: ErrorCallback): void

Unsubscribes from AVTranscoder errors. After the unsubscription, your application can no longer receive AVTranscoder errors.

**System capability**: SystemCapability.Multimedia.Media.AVTranscoder

**Parameters**

| Name| Type  | Mandatory| Description                                                        |
| ------ | ------ | ---- | ------------------------------------------------------------ |
| type   | string | Yes  | Event type, which is **'error'** in this case.<br>This event is triggered when an error occurs during transcoding.|
| callback | [ErrorCallback](../apis-basic-services-kit/js-apis-base.md#errorcallback) | No  | Callback that has been registered to listen for AVTranscoder errors.|

**Example**

```ts
avTranscoder.off('error');
```

### on('complete')<sup>12+</sup>

on(type: 'complete', callback: Callback\<void>): void

Subscribes to the event indicating that transcoding is complete. An application can subscribe to only one transcoding completion event. When the application initiates multiple subscriptions to this event, the last subscription prevails.

When this event is reported, the current transcoding operation is complete. You can call [release()](#release12) to exit the transcoding.

**System capability**: SystemCapability.Multimedia.Media.AVTranscoder

**Parameters**

| Name  | Type    | Mandatory| Description                                                        |
| -------- | -------- | ---- | ------------------------------------------------------------ |
| type     | string   | Yes  | Event type, which is **'complete'** in this case. This event is triggered by the system during transcoding.|
| callback | [Callback](../apis-basic-services-kit/js-apis-base.md#callback) | Yes  | Callback that has been registered to listen for transcoding completion events.|

**Example**

```ts
avTranscoder.on('complete', () => {
  console.info('avTranscoder complete');
});
```

### off('complete')<sup>12+</sup>

off(type:'complete', callback?: Callback\<void>): void

Unsubscribes from the event indicating that transcoding is complete.

**System capability**: SystemCapability.Multimedia.Media.AVTranscoder

**Parameters**

| Name| Type  | Mandatory| Description                                                        |
| ------ | ------ | ---- | ------------------------------------------------------------ |
| type   | string | Yes  | Event type, which is **'complete'** in this case. This event can be triggered by both user operations and the system.|
| callback | [Callback](../apis-basic-services-kit/js-apis-base.md#callback) | No  | Callback invoked when the event is triggered.|

**Example**

```ts
avTranscoder.off('complete');
```

## AVTranscoderConfig<sup>12+</sup>

Describes the video transcoding parameters.

**System capability**: SystemCapability.Multimedia.Media.AVTranscoder

| Name           | Type                                   | Read-Only| Optional| Description                                                        |
| --------------- | ---------------------------------------- |---- | ---- | ------------------------------------------------------------ |
| audioBitrate | number     | No| Yes| Bit rate of the output audio, in bit/s. The default value is 48 kbit/s.|
| audioCodec | [CodecMimeType](#codecmimetype8)     | No| Yes | Encoding format of the output audio. Currently, only AAC is supported.                  |
| fileFormat         | [ContainerFormatType](#containerformattype8) | No| No  | Container format of the output video file. Currently, only MP4 is supported.|
| videoBitrate         | number | No|  Yes | Bit rate of the output video, in bit/s. The default bit rate depends on the resolution of the output video. The default bit rate is 1 Mbit/s for the resolution in the range [240p, 480P], 2 Mbit/s for the range (480P,720P], 4 Mbit/s for the range (720P,1080P], and 8 Mbit/s for 1080p or higher.|
| videoCodec        | [CodecMimeType](#codecmimetype8) | No| Yes  | Encoding format of the output video. Currently, only AVC and HEVC are supported.|
| videoFrameWidth        | number | No|  Yes  | Width of the output video frame, in px. If this parameter is unspecified, the width of the source video frame is used.|
| videoFrameHeight        | number | No|  Yes  | Height of the output video frame, in px. If this parameter is unspecified, the height of the source video frame is used.|



## AVMetadataExtractor<sup>11+</sup>

Provides APIs to obtain metadata from media resources. Before calling any API of **AVMetadataExtractor**, you must use [createAVMetadataExtractor()](#mediacreateavmetadataextractor11) to create an **AVMetadataExtractor** instance.

For details about the demo for obtaining audio or video metadata, see [Obtaining Audio/Video Metadata](../../media/media/avmetadataextractor.md).

### Attributes

**System capability**: SystemCapability.Multimedia.Media.AVMetadataExtractor

| Name                                               | Type                                                        | Readable| Writable| Description                                                        |
| --------------------------------------------------- | ------------------------------------------------------------ | ---- | ---- | ------------------------------------------------------------ |
| fdSrc<sup>11+</sup>                                  | [AVFileDescriptor](#avfiledescriptor9)                       | Yes  | Yes  | Media file descriptor, which specifies the data source. Before obtaining metadata, you must set the data source through either **fdSrc** or **dataSrc**.<br>**Example:**<br>There is a media file that stores continuous assets, the address offset is 0, and the byte length is 100. Its file descriptor is **AVFileDescriptor {fd = resourceHandle; offset = 0; length = 100; }**.<br>**NOTE**<br> - After the resource handle (FD) is transferred to an **AVMetadataExtractor** instance, do not use the resource handle to perform other read and write operations, including but not limited to transferring this handle to other **AVPlayer**, **AVMetadataExtractor**, **AVImageGenerator**, or **AVTranscoder** instance. Competition occurs when multiple AVMetadataExtractor use the same resource handle to read and write files at the same time, resulting in errors in obtaining data.|
| dataSrc<sup>11+</sup>                               | [AVDataSrcDescriptor](#avdatasrcdescriptor10)                | Yes  | Yes  | Streaming media resource descriptor, which specifies the data source. Before obtaining metadata, you must set the data source through either **fdSrc** or **dataSrc**.<br> When an application obtains a media file from the remote, you can set **dataSrc** to obtain the metadata before the application finishes the downloading.|

### fetchMetadata<sup>11+</sup>

fetchMetadata(callback: AsyncCallback\<AVMetadata>): void

Obtains media metadata. This API uses an asynchronous callback to return the result.

**System capability**: SystemCapability.Multimedia.Media.AVMetadataExtractor

**Parameters**

| Name  | Type                                        | Mandatory| Description                               |
| -------- | -------------------------------------------- | ---- | ----------------------------------- |
| callback | AsyncCallback\<[AVMetadata](#avmetadata11)>       | Yes  | Callback used to return the result, which is an **AVMetadata** instance.|

**Error codes**

For details about the error codes, see [Media Error Codes](errorcode-media.md).

| ID| Error Message                                  |
| -------- | ------------------------------------------ |
| 5400102  | Operation not allowed. Returned by callback. |
| 5400106  | Unsupported format. Returned by callback.  |

**Example**

```ts
import { BusinessError } from '@kit.BasicServicesKit';

avMetadataExtractor.fetchMetadata((error: BusinessError, metadata: media.AVMetadata) => {
  if (error) {
    console.error(`Failed to fetch Metadata, err = ${JSON.stringify(error)}`);
    return;
  }
  console.info(`Succeeded in fetching Metadata, genre: ${metadata.genre}`);
});
```

### fetchMetadata<sup>11+</sup>

fetchMetadata(): Promise\<AVMetadata>

Obtains media metadata. This API uses a promise to return the result.

**System capability**: SystemCapability.Multimedia.Media.AVMetadataExtractor

**Return value**

| Type          | Description                                    |
| -------------- | ---------------------------------------- |
| Promise\<[AVMetadata](#avmetadata11)>  | Promise used to return the result, which is an **AVMetadata** instance.|

**Error codes**

For details about the error codes, see [Media Error Codes](errorcode-media.md).

| ID| Error Message                                 |
| -------- | ----------------------------------------- |
| 5400102  | Operation not allowed. Returned by promise. |
| 5400106  | Unsupported format. Returned by promise.  |

**Example**

```ts
import { BusinessError } from '@kit.BasicServicesKit';

avMetadataExtractor.fetchMetadata().then((metadata: media.AVMetadata) => {
  console.info(`Succeeded in fetching Metadata, genre: ${metadata.genre}`)
}).catch((error: BusinessError) => {
  console.error(`Failed to fetch Metadata, error message:${error.message}`);
});
```

### fetchAlbumCover<sup>11+</sup>

fetchAlbumCover(callback: AsyncCallback\<image.PixelMap>): void

Obtains the cover of the audio album. This API uses an asynchronous callback to return the result.

**System capability**: SystemCapability.Multimedia.Media.AVMetadataExtractor

**Parameters**

| Name  | Type                                        | Mandatory| Description                               |
| -------- | -------------------------------------------- | ---- | ----------------------------------- |
| callback | AsyncCallback\<[image.PixelMap](../apis-image-kit/js-apis-image.md#pixelmap7)>    | Yes  | Callback used to return the album cover.|

**Error codes**

For details about the error codes, see [Media Error Codes](errorcode-media.md).

| ID| Error Message                                  |
| -------- | ------------------------------------------ |
| 5400102  | Operation not allowed. Return by callback. |
| 5400106  | Unsupported format. Returned by callback.  |

**Example**

```ts
import { BusinessError } from '@kit.BasicServicesKit';
import { image } from '@kit.ImageKit';

let pixel_map : image.PixelMap | undefined = undefined;

avMetadataExtractor.fetchAlbumCover((error: BusinessError, pixelMap: image.PixelMap) => {
  if (error) {
    console.error(`Failed to fetch AlbumCover, error = ${JSON.stringify(error)}`);
    return;
  }
  pixel_map = pixelMap;
});
```

### fetchAlbumCover<sup>11+</sup>

fetchAlbumCover(): Promise\<image.PixelMap>

Obtains the cover of the audio album. This API uses a promise to return the result.

**System capability**: SystemCapability.Multimedia.Media.AVMetadataExtractor

**Return value**

| Type          | Description                                    |
| -------------- | ---------------------------------------- |
| Promise\<[image.PixelMap](../apis-image-kit/js-apis-image.md#pixelmap7)> |  Promise used to return the album cover.|

**Error codes**

For details about the error codes, see [Media Error Codes](errorcode-media.md).

| ID| Error Message                                 |
| -------- | ----------------------------------------- |
| 5400102  | Operation not allowed. Returned by promise. |
| 5400106  | Unsupported format. Returned by promise.  |

**Example**

```ts
import { BusinessError } from '@kit.BasicServicesKit';
import { image } from '@kit.ImageKit';

let pixel_map : image.PixelMap | undefined = undefined;

avMetadataExtractor.fetchAlbumCover().then((pixelMap: image.PixelMap) => {
  pixel_map = pixelMap;
}).catch((error: BusinessError) => {
  console.error(`Failed to fetch AlbumCover, error message:${error.message}`);
});
```

### release<sup>11+</sup>

release(callback: AsyncCallback\<void>): void

Releases this **AVMetadataExtractor** instance. This API uses an asynchronous callback to return the result.

**System capability**: SystemCapability.Multimedia.Media.AVMetadataExtractor

**Parameters**

| Name  | Type                                        | Mandatory| Description                               |
| -------- | -------------------------------------------- | ---- | ----------------------------------- |
| callback | AsyncCallback\<void>                   | Yes  |Callback used to return the result. If the operation is successful, **err** is **undefined**; otherwise, **err** is an error object.|

**Error codes**

For details about the error codes, see [Media Error Codes](errorcode-media.md).

| ID| Error Message                                  |
| -------- | ------------------------------------------ |
| 5400102  | Operation not allowed. Returned by callback. |

**Example**

```ts
import { BusinessError } from '@kit.BasicServicesKit';

avMetadataExtractor.release((error: BusinessError) => {
  if (error) {
    console.error(`Failed to release, err = ${JSON.stringify(error)}`);
    return;
  }
  console.info(`Succeeded in releasing.`);
});
```

### release<sup>11+</sup>

release(): Promise\<void>

Releases this **AVMetadataExtractor** instance. This API uses a promise to return the result.

**System capability**: SystemCapability.Multimedia.Media.AVMetadataExtractor

**Return value**

| Type          | Description                                    |
| -------------- | ---------------------------------------- |
| Promise\<void> | Promise that returns no value.|

**Error codes**

For details about the error codes, see [Media Error Codes](errorcode-media.md).

| ID| Error Message                                 |
| -------- | ----------------------------------------- |
| 5400102  | Operation not allowed. Returned by promise. |

**Example**

```ts
import { BusinessError } from '@kit.BasicServicesKit';

avMetadataExtractor.release().then(() => {
  console.info(`Succeeded in releasing.`);
}).catch((error: BusinessError) => {
  console.error(`Failed to release, error message:${error.message}`);
});
```

## AVMetadata<sup>11+</sup>

Defines the audio and video metadata. Parameters that are not declared as read-only in [AVRecorderConfig](#avrecorderconfig9) can be used as input parameters for recording of [AVRecorder](#avrecorder9).

**System capability**: SystemCapability.Multimedia.Media.AVMetadataExtractor

| Name  | Type  | Mandatory| Description                                                        |
| ------ | ------ | ---- | ------------------------------------------------------------ |
| album     | string | No  | Title of the album. This parameter is read-only in the current version.    |
| albumArtist | string | No  | Artist of the album. This parameter is read-only in the current version.|
| artist | string | No  | Artist of the media asset. This parameter is read-only in the current version.|
| author | string | No  | Author of the media asset. This parameter is read-only in the current version.|
| dateTime | string | No  | Time when the media asset is created. This parameter is read-only in the current version.|
| dateTimeFormat | string | No  | Time when the media asset is created. The value is in the YYYY-MM-DD HH:mm:ss format. This parameter is read-only in the current version.|
| composer | string | No  | Composer of the media asset. This parameter is read-only in the current version.|
| duration | string | No  | Duration of the media asset. This parameter is read-only in the current version.|
| genre | string | No  | Type or genre of the media asset.|
| hasAudio | string | No  | Whether the media asset contains audio. This parameter is read-only in the current version.|
| hasVideo | string | No  | Whether the media asset contains a video. This parameter is read-only in the current version.|
| mimeType | string | No  | MIME type of the media asset. This parameter is read-only in the current version.|
| trackCount | string | No  | Number of tracks of the media asset. This parameter is read-only in the current version.|
| sampleRate | string | No  | Audio sampling rate, in Hz. This parameter is read-only in the current version.|
| title | string | No  | Title of the media asset. This parameter is read-only in the current version. This parameter is read-only in the current version.|
| videoHeight | string | No  | Video height, in px. This parameter is read-only in the current version.|
| videoWidth | string | No  | Video width, in px. This parameter is read-only in the current version.|
| videoOrientation | string | No  | Video rotation direction, in degrees.|
| hdrType<sup>12+</sup> | [HdrType](#hdrtype12) | No  | HDR type of the media asset. This parameter is read-only in the current version.|
| location<sup>12+</sup> | [Location](#location) | No| Geographical location of the media asset.|
| customInfo<sup>12+</sup> | Record<string, string> | No| Custom key-value mappings obtained from **moov.meta.list**.|

## HdrType<sup>12+</sup>

Enumerates the HDR types.

**System capability**: SystemCapability.Multimedia.Media.Core

| Name                     | Value  | Description                  |
| ------------------------- | ---- | ---------------------- |
| AV_HDR_TYPE_NONE          | 0    | No HDR.|
| AV_HDR_TYPE_VIVID         | 1    | HDR VIVID.|

## media.createAudioPlayer<sup>(deprecated)</sup>

createAudioPlayer(): AudioPlayer

Creates an **AudioPlayer** instance in synchronous mode.

> **NOTE**
>
> This API is supported since API version 6 and deprecated since API version 9. You are advised to use [createAVPlayer](#mediacreateavplayer9) instead.

**System capability**: SystemCapability.Multimedia.Media.AudioPlayer

**Return value**

| Type                       | Description                                                        |
| --------------------------- | ------------------------------------------------------------ |
| [AudioPlayer](#audioplayerdeprecated) | If the operation is successful, an **AudioPlayer** instance is returned; otherwise, **null** is returned. After the instance is created, you can start, pause, or stop audio playback.|

**Example**

```ts
let audioPlayer: media.AudioPlayer = media.createAudioPlayer();
```

## media.createVideoPlayer<sup>(deprecated)</sup>

createVideoPlayer(callback: AsyncCallback\<VideoPlayer>): void

Creates a **VideoPlayer** instance. This API uses an asynchronous callback to return the result.

> **NOTE**
>
> This API is supported since API version 8 and deprecated since API version 9. You are advised to use [createAVPlayer](#mediacreateavplayer9) instead.

**System capability**: SystemCapability.Multimedia.Media.VideoPlayer

**Parameters**

| Name  | Type                                      | Mandatory| Description                                                        |
| -------- | ------------------------------------------ | ---- | ------------------------------------------------------------ |
| callback | AsyncCallback<[VideoPlayer](#videoplayerdeprecated)> | Yes  | Callback used to return the result. If the operation is successful, **err** is **undefined** and **data** is the **VideoPlayer** instance created; otherwise, **err** is an error object.|

**Example**

```ts
import { BusinessError } from '@kit.BasicServicesKit';

let videoPlayer: media.VideoPlayer;
media.createVideoPlayer((error: BusinessError, video: media.VideoPlayer) => {
  if (video != null) {
    videoPlayer = video;
    console.info('Succeeded in creating VideoPlayer');
  } else {
    console.error(`Failed to create VideoPlayer, error:${error}`);
  }
});
```

## media.createVideoPlayer<sup>(deprecated)</sup>

createVideoPlayer(): Promise\<VideoPlayer>

Creates a **VideoPlayer** instance. This API uses a promise to return the result.

> **NOTE**
>
> This API is supported since API version 8 and deprecated since API version 9. You are advised to use [createAVPlayer](#mediacreateavplayer9-1) instead.

**System capability**: SystemCapability.Multimedia.Media.VideoPlayer

**Return value**

| Type                                | Description                                                        |
| ------------------------------------ | ------------------------------------------------------------ |
| Promise<[VideoPlayer](#videoplayerdeprecated)> | Promise used to return the result. If the operation is successful, a **VideoPlayer** instance is returned; otherwise, **null** is returned. The instance can be used to manage and play video.|

**Example**

```ts
import { BusinessError } from '@kit.BasicServicesKit';

let videoPlayer: media.VideoPlayer;
media.createVideoPlayer().then((video: media.VideoPlayer) => {
  if (video != null) {
    videoPlayer = video;
    console.info('Succeeded in creating VideoPlayer');
  } else {
    console.error('Failed to create VideoPlayer');
  }
}).catch((error: BusinessError) => {
  console.error(`Failed to create VideoPlayer, error:${error}`);
});
```

## media.createAudioRecorder<sup>(deprecated)</sup>

createAudioRecorder(): AudioRecorder

Creates an **AudioRecorder** instance to control audio recording.
Only one **AudioRecorder** instance can be created per device.

> **NOTE**
>
> This API is supported since API version 6 and deprecated since API version 9. You are advised to use [createAVRecorder](#mediacreateavrecorder9) instead.

**System capability**: SystemCapability.Multimedia.Media.AudioRecorder

**Return value**

| Type                           | Description                                                        |
| ------------------------------- | ------------------------------------------------------------ |
| [AudioRecorder](#audiorecorderdeprecated) | If the operation is successful, an **AudioRecorder** instance is returned; otherwise, **null** is returned. The instance can be used to record audio.|

**Example**

```ts
let audioRecorder: media.AudioRecorder = media.createAudioRecorder();
```

## MediaErrorCode<sup>(deprecated)</sup>

Enumerates the media error codes.

> **NOTE**
>
> This enum is supported since API version 8 and deprecated since API version 11. You are advised to use [Media Error Codes](#averrorcode9) instead.

**System capability**: SystemCapability.Multimedia.Media.Core

| Name                      | Value  | Description                                  |
| -------------------------- | ---- | -------------------------------------- |
| MSERR_OK                   | 0    | The operation is successful.                        |
| MSERR_NO_MEMORY            | 1    | Failed to allocate memory. The system may have no available memory.|
| MSERR_OPERATION_NOT_PERMIT | 2    | No permission to perform the operation.                |
| MSERR_INVALID_VAL          | 3    | Invalid input parameter.                    |
| MSERR_IO                   | 4    | An I/O error occurs.                      |
| MSERR_TIMEOUT              | 5    | The operation times out.                        |
| MSERR_UNKNOWN              | 6    | An unknown error occurs.                        |
| MSERR_SERVICE_DIED         | 7    | Invalid server.                      |
| MSERR_INVALID_STATE        | 8    | The operation is not allowed in the current state.  |
| MSERR_UNSUPPORTED          | 9    | The operation is not supported in the current version.      |

## AudioPlayer<sup>(deprecated)</sup>

> **NOTE**
>
> This API is supported since API version 6 and deprecated since API version 9. You are advised to use [AVPlayer](#avplayer9) instead.

Provides APIs to manage and play audio. Before calling any API in **AudioPlayer**, you must use [createAudioPlayer()](#mediacreateaudioplayerdeprecated) to create an **AudioPlayer** instance.

### Attributes<sup>(deprecated)</sup>

**System capability**: SystemCapability.Multimedia.Media.AudioPlayer

| Name                           | Type                                                  | Read-Only| Optional| Description                                                        |
| ------------------------------- | ------------------------------------------------------ | ---- | ---- | ------------------------------------------------------------ |
| src                             | string                                                 | No  | No  | Audio file URI. The mainstream audio formats (M4A, AAC, MP3, OGG, WAV, and AMR) are supported.<br>**Example of supported URLs**:<br>1. FD: fd://xx<br>![](figures/en-us_image_url.png)<br>2. HTTP: http\://xx<br>3. HTTPS: https\://xx<br>4. HLS: http\://xx or https\://xx<br>**Required permissions**: ohos.permission.READ_MEDIA or ohos.permission.INTERNET|
| fdSrc<sup>9+</sup>              | [AVFileDescriptor](#avfiledescriptor9)                 | No  | No  | Description of the audio file. This attribute is required when audio assets of an application are continuously stored in a file.<br>**Example:**<br>Assume that a music file that stores continuous music assets consists of the following:<br>Music 1 (address offset: 0, byte length: 100)<br>Music 2 (address offset: 101; byte length: 50)<br>Music 3 (address offset: 151, byte length: 150)<br>1. To play music 1: AVFileDescriptor {fd = resource handle; offset = 0; length = 100; }<br>2. To play music 2: AVFileDescriptor {fd = resource handle; offset = 101; length = 50; }<br>3. To play music 3: AVFileDescriptor {fd = resource handle; offset = 151; length = 150; }<br>To play an independent music file, use **src=fd://xx**.<br>|
| loop                            | boolean                                                | No  | No | Whether to loop audio playback. The value **true** means to loop audio playback, and **false** means the opposite.                |
| audioInterruptMode<sup>9+</sup> | [audio.InterruptMode](../apis-audio-kit/js-apis-audio.md#interruptmode9) | Yes  | Yes  | Audio interruption mode.                                              |
| currentTime                     | number                                                 | Yes  | No  | Current audio playback position, in ms.                      |
| duration                        | number                                                 | Yes  | No  | Audio duration, in ms.                                |
| state                           | [AudioState](#audiostatedeprecated)                              | Yes  | No  | Audio playback state. This state cannot be used as the condition for triggering the call of **play()**, **pause()**, or **stop()**.|

### play<sup>(deprecated)</sup>

play(): void

Starts to play an audio asset. This API can be called only after the **'dataLoad'** event is triggered.

> **NOTE**
>
> This API is supported since API version 6 and deprecated since API version 9. You are advised to use [AVPlayer.play](#play9) instead.

**System capability**: SystemCapability.Multimedia.Media.AudioPlayer

**Example**

```ts
audioPlayer.on('play', () => {    // Set the 'play' event callback.
  console.info('audio play called');
});
audioPlayer.play();
```

### pause<sup>(deprecated)</sup>

pause(): void

Pauses audio playback.

> **NOTE**
>
> This API is supported since API version 6 and deprecated since API version 9. You are advised to use [AVPlayer.pause](#pause9) instead.

**System capability**: SystemCapability.Multimedia.Media.AudioPlayer

**Example**

```ts
audioPlayer.on('pause', () => {    // Set the 'pause' event callback.
  console.info('audio pause called');
});
audioPlayer.pause();
```

### stop<sup>(deprecated)</sup>

stop(): void

Stops audio playback.

> **NOTE**
>
> This API is supported since API version 6 and deprecated since API version 9. You are advised to use [AVPlayer.stop](#stop9) instead.

**System capability**: SystemCapability.Multimedia.Media.AudioPlayer

**Example**

```ts
audioPlayer.on('stop', () => {    // Set the 'stop' event callback.
  console.info('audio stop called');
});
audioPlayer.stop();
```

### reset<sup>(deprecated)</sup>

reset(): void

Resets the audio asset to be played.

> **NOTE**
>
> This API is supported since API version 7 and deprecated since API version 9. You are advised to use [AVPlayer.reset](#reset9) instead.

**System capability**: SystemCapability.Multimedia.Media.AudioPlayer

**Example**

```ts
audioPlayer.on('reset', () => {    // Set the 'reset' event callback.
  console.info('audio reset called');
});
audioPlayer.reset();
```

### seek<sup>(deprecated)</sup>

seek(timeMs: number): void

Seeks to the specified playback position.

> **NOTE**
>
> This API is supported since API version 6 and deprecated since API version 9. You are advised to use [AVPlayer.seek](#seek9) instead.

**System capability**: SystemCapability.Multimedia.Media.AudioPlayer

**Parameters**

| Name| Type  | Mandatory| Description                                                       |
| ------ | ------ | ---- | ----------------------------------------------------------- |
| timeMs | number | Yes  | Position to seek to, in ms. The value range is [0, duration].|

**Example**

```ts
audioPlayer.on('timeUpdate', (seekDoneTime: number) => {    // Set the 'timeUpdate' event callback.
  if (seekDoneTime == null) {
    console.error('Failed to seek');
    return;
  }
  console.info('Succeeded in seek. seekDoneTime: ' + seekDoneTime);
});
audioPlayer.seek(30000); // Seek to 30000 ms.
```

### setVolume<sup>(deprecated)</sup>

setVolume(vol: number): void

Sets the volume.

> **NOTE**
>
> This API is supported since API version 6 and deprecated since API version 9. You are advised to use [AVPlayer.setVolume](#setvolume9) instead.

**System capability**: SystemCapability.Multimedia.Media.AudioPlayer

**Parameters**

| Name| Type  | Mandatory| Description                                                        |
| ------ | ------ | ---- | ------------------------------------------------------------ |
| vol    | number | Yes  | Relative volume. The value ranges from 0.00 to 1.00. The value **1.00** indicates the maximum volume (100%).|

**Example**

```ts
audioPlayer.on('volumeChange', () => {    // Set the 'volumeChange' event callback.
  console.info('audio volumeChange called');
});
audioPlayer.setVolume(1);    // Set the volume to 100%.
```

### release<sup>(deprecated)</sup>

release(): void

Releases the audio playback resources.

> **NOTE**
>
> This API is supported since API version 6 and deprecated since API version 9. You are advised to use [AVPlayer.release](#release9) instead.

**System capability**: SystemCapability.Multimedia.Media.AudioPlayer

**Example**

```ts
audioPlayer.release();
audioPlayer = undefined;
```

### getTrackDescription<sup>(deprecated)</sup>

getTrackDescription(callback: AsyncCallback\<Array\<MediaDescription>>): void

Obtains the audio track information. It can be called only after the **'dataLoad'** event is triggered. This API uses an asynchronous callback to return the result.

> **NOTE**
>
> This API is supported since API version 8 and deprecated since API version 9. You are advised to use [AVPlayer.getTrackDescription](#gettrackdescription9) instead.

**System capability**: SystemCapability.Multimedia.Media.AudioPlayer

**Parameters**

| Name  | Type                                                        | Mandatory| Description                                      |
| -------- | ------------------------------------------------------------ | ---- | ------------------------------------------ |
| callback | AsyncCallback\<Array\<[MediaDescription](#mediadescription8)>> | Yes  | Callback used to return the result. If the operation is successful, **err** is **undefined** and **data** is the MediaDescription array obtained; otherwise, **err** is an error object.|

**Example**

```ts
import { BusinessError } from '@kit.BasicServicesKit';

audioPlayer.getTrackDescription((error: BusinessError, arrList: Array<media.MediaDescription>) => {
  if (arrList != null) {
    console.info('Succeeded in getting TrackDescription');
  } else {
    console.error(`Failed to get TrackDescription, error:${error}`);
  }
});
```

### getTrackDescription<sup>(deprecated)</sup>

getTrackDescription(): Promise\<Array\<MediaDescription>>

Obtains the audio track information. It can be called only after the **'dataLoad'** event is triggered. This API uses a promise to return the result.

> **NOTE**
>
> This API is supported since API version 8 and deprecated since API version 9. You are advised to use [AVPlayer.getTrackDescription](#gettrackdescription9-1) instead.

**System capability**: SystemCapability.Multimedia.Media.AudioPlayer

**Return value**

| Type                                                  | Description                                           |
| ------------------------------------------------------ | ----------------------------------------------- |
| Promise<Array<[MediaDescription](#mediadescription8)>> | Promise used to return a **MediaDescription** array, which records the audio track information.|

**Example**

```ts
import { BusinessError } from '@kit.BasicServicesKit';

audioPlayer.getTrackDescription().then((arrList: Array<media.MediaDescription>) => {
  console.info('Succeeded in getting TrackDescription');
}).catch((error: BusinessError) => {
  console.error(`Failed to get TrackDescription, error:${error}`);
});
```

### on('bufferingUpdate')<sup>(deprecated)</sup>

on(type: 'bufferingUpdate', callback: (infoType: BufferingInfoType, value: number) => void): void

Subscribes to the audio buffering update event. This API works only under online playback.

> **NOTE**
>
> This API is supported since API version 8 and deprecated since API version 9. You are advised to use [AVPlayer.on('bufferingUpdate')](#onbufferingupdate9) instead.

**System capability**: SystemCapability.Multimedia.Media.AudioPlayer

**Parameters**

| Name  | Type    | Mandatory| Description                                                        |
| -------- | -------- | ---- | ------------------------------------------------------------ |
| type     | string   | Yes  | Event type, which is **'bufferingUpdate'** in this case.       |
| callback | function | Yes  | Callback invoked when the event is triggered.<br>The value of [BufferingInfoType](#bufferinginfotype8) is fixed at **0**.|

**Example**

```ts
audioPlayer.on('bufferingUpdate', (infoType: media.BufferingInfoType, value: number) => {
  console.info('audio bufferingInfo type: ' + infoType);
  console.info('audio bufferingInfo value: ' + value);
});
```

### on('play' | 'pause' | 'stop' | 'reset' | 'dataLoad' | 'finish' | 'volumeChange')<sup>(deprecated)</sup>

on(type: 'play' | 'pause' | 'stop' | 'reset' | 'dataLoad' | 'finish' | 'volumeChange', callback: () => void): void

Subscribes to the audio playback events.

> **NOTE**
>
> This API is supported since API version 6 and deprecated since API version 9. You are advised to use [AVPlayer.on('stateChange')](#onstatechange9) instead.

**System capability**: SystemCapability.Multimedia.Media.AudioPlayer

**Parameters**

| Name  | Type      | Mandatory| Description                                                        |
| -------- | ---------- | ---- | ------------------------------------------------------------ |
| type     | string     | Yes  | Event type. The following events are supported:<br>- 'play': triggered when the [play()](#playdeprecated) API is called and audio playback starts.<br>- 'pause': triggered when the [pause()](#pausedeprecated) API is called and audio playback is paused.<br>- 'stop': triggered when the [stop()](#stopdeprecated) API is called and audio playback stops.<br>- 'reset': triggered when the [reset()](#resetdeprecated) API is called and audio playback is reset.<br>- 'dataLoad': triggered when the audio data is loaded, that is, when the **src** attribute is configured.<br>- 'finish': triggered when the audio playback is finished.<br>- 'volumeChange': triggered when the [setVolume()](#setvolumedeprecated) API is called and the playback volume is changed.|
| callback | () => void | Yes  | Callback invoked when the event is triggered.                                          |

**Example**

```ts
import { fileIo as fs } from '@kit.CoreFileKit';
import { BusinessError } from '@kit.BasicServicesKit';

let audioPlayer: media.AudioPlayer = media.createAudioPlayer();  // Create an AudioPlayer instance.
audioPlayer.on('dataLoad', () => {            // Set the 'dataLoad' event callback, which is triggered when the src attribute is set successfully.
  console.info('audio set source called');
  audioPlayer.play();                       // Start the playback and trigger the 'play' event callback.
});
audioPlayer.on('play', () => {                // Set the 'play' event callback.
  console.info('audio play called');
  audioPlayer.seek(30000);                  // Call the seek() API and trigger the 'timeUpdate' event callback.
});
audioPlayer.on('pause', () => {               // Set the 'pause' event callback.
  console.info('audio pause called');
  audioPlayer.stop();                       // Stop the playback and trigger the 'stop' event callback.
});
audioPlayer.on('reset', () => {               // Set the 'reset' event callback.
  console.info('audio reset called');
  audioPlayer.release();                    // Release the AudioPlayer instance.
  audioPlayer = undefined;
});
audioPlayer.on('timeUpdate', (seekDoneTime: number) => {  // Set the 'timeUpdate' event callback.
  if (seekDoneTime == null) {
    console.error('Failed to seek');
    return;
  }
  console.info('Succeeded in seek, and seek time is ' + seekDoneTime);
  audioPlayer.setVolume(0.5);                // Set the volume to 50% and trigger the 'volumeChange' event callback.
});
audioPlayer.on('volumeChange', () => {         // Set the 'volumeChange' event callback.
  console.info('audio volumeChange called');
  audioPlayer.pause();                       // Pause the playback and trigger the 'pause' event callback.
});
audioPlayer.on('finish', () => {               // Set the 'finish' event callback.
  console.info('audio play finish');
  audioPlayer.stop();                        // Stop the playback and trigger the 'stop' event callback.
});
audioPlayer.on('error', (error: BusinessError) => {  // Set the 'error' event callback.
  console.error(`audio error called, error: ${error}`);
});

// Set the FD (local playback) of the audio file selected by the user.
let fdPath = 'fd://';
// The stream in the path can be pushed to the device by running the "hdc file send D:\xxx\01.mp3 /data/accounts/account_0/appdata" command.
let path = '/data/accounts/account_0/appdata/ohos.xxx.xxx.xxx/01.mp3';
fs.open(path).then((file) => {
  fdPath = fdPath + '' + file.fd;
  console.info('Succeeded in opening fd, fd is' + fdPath);
  audioPlayer.src = fdPath;  // Set the src attribute and trigger the 'dataLoad' event callback.
}, (err: BusinessError) => {
  console.error('Failed to open fd, err is' + err);
}).catch((err: BusinessError) => {
  console.error('Failed to open fd, err is' + err);
});
```

### on('timeUpdate')<sup>(deprecated)</sup>

on(type: 'timeUpdate', callback: Callback\<number>): void

Subscribes to the **'timeUpdate'** event. This event is reported every second when the audio playback is in progress.

> **NOTE**
>
> This API is supported since API version 6 and deprecated since API version 9. You are advised to use [AVPlayer.on('timeUpdate')](#ontimeupdate9) instead.

**System capability**: SystemCapability.Multimedia.Media.AudioPlayer

**Parameters**

| Name  | Type             | Mandatory| Description                                                        |
| -------- | ----------------- | ---- | ------------------------------------------------------------ |
| type     | string            | Yes  | Event type, which is **'timeUpdate'** in this case.<br>The **'timeUpdate'** event is triggered when the audio playback starts after an audio playback timestamp update.|
| callback | Callback\<number> | Yes  | Callback invoked when the event is triggered. The input parameter is the updated timestamp.            |

**Example**

```ts
audioPlayer.on('timeUpdate', (newTime: number) => {    // Set the 'timeUpdate' event callback.
  if (newTime == null) {
    console.error('Failed to do timeUpadate');
    return;
  }
  console.info('Succeeded in doing timeUpadate. seekDoneTime: ' + newTime);
});
audioPlayer.play();    // The 'timeUpdate' event is triggered when the playback starts.
```

### on('audioInterrupt')<sup>(deprecated)</sup>

on(type: 'audioInterrupt', callback: (info: audio.InterruptEvent) => void): void

Subscribes to the audio interruption event. For details, see [audio.InterruptEvent](../apis-audio-kit/js-apis-audio.md#interruptevent9).

> **NOTE**
>
> This API is supported in API version 9 and deprecated since API version 9. You are advised to use [AVPlayer.on('audioInterrupt')](#onaudiointerrupt9) instead.

**System capability**: SystemCapability.Multimedia.Media.AudioPlayer

**Parameters**

| Name  | Type                                                        | Mandatory| Description                                                    |
| -------- | ------------------------------------------------------------ | ---- | -------------------------------------------------------- |
| type     | string                                                       | Yes  | Event type, which is **'audioInterrupt'** in this case.|
| callback | function  | Yes  | Callback invoked when the event is triggered.                              |

**Example**

```ts
import { audio } from '@kit.AudioKit';

audioPlayer.on('audioInterrupt', (info: audio.InterruptEvent) => {
  console.info('audioInterrupt called,and InterruptEvent info is:' + info)
})
```

### on('error')<sup>(deprecated)</sup>

on(type: 'error', callback: ErrorCallback): void

Subscribes to audio playback error events. After an error event is reported, you must handle the event and exit the playback.

> **NOTE**
>
> This API is supported since API version 6 and deprecated since API version 9. You are advised to use [AVPlayer.on('error')](#onerror9) instead.

**System capability**: SystemCapability.Multimedia.Media.AudioPlayer

**Parameters**

| Name  | Type         | Mandatory| Description                                                        |
| -------- | ------------- | ---- | ------------------------------------------------------------ |
| type     | string        | Yes  | Event type, which is **'error'** in this case.<br>This event is triggered when an error occurs during audio playback.|
| callback | [ErrorCallback](../apis-basic-services-kit/js-apis-base.md#errorcallback) | Yes  | Callback invoked when the event is triggered.                                      |

**Example**

```ts
import { BusinessError } from '@kit.BasicServicesKit';

audioPlayer.on('error', (error: BusinessError) => {  // Set the 'error' event callback.
  console.error(`audio error called, error: ${error}`);
});
audioPlayer.setVolume(3); // Set volume to an invalid value to trigger the 'error' event.
```

## AudioState<sup>(deprecated)</sup>

type AudioState = 'idle' | 'playing' | 'paused' | 'stopped' | 'error'

Enumerates the audio playback states. You can obtain the state through the **state** attribute.

> **NOTE**
>
> This API is supported since API version 6 and deprecated since API version 9. You are advised to use [AVPlayerState](#avplayerstate9) instead.

**System capability**: SystemCapability.Multimedia.Media.AudioPlayer

| Type   | Description                                          |
| ------- | ---------------------------------------------- |
| 'idle'    | No audio playback is in progress. The audio player is in this state after the **'dataload'** or **'reset'** event is triggered.|
| 'playing' | Audio playback is in progress. The audio player is in this state after the **'play'** event is triggered.          |
| 'paused'  | Audio playback is paused. The audio player is in this state after the **'pause'** event is triggered.         |
| 'stopped' | Audio playback is stopped. The audio player is in this state after the **'stop'** event is triggered.     |
| 'error'   | Audio playback is in the error state.                                    |

## VideoPlayer<sup>(deprecated)</sup>

> **NOTE**
>
> This API is supported since API version 8 and deprecated since API version 9. You are advised to use [AVPlayer](#avplayer9) instead.

Provides APIs to manage and play video. Before calling any API of **VideoPlayer**, you must use [createVideoPlayer()](#mediacreatevideoplayerdeprecated) to create a **VideoPlayer** instance.

### Attributes

**System capability**: SystemCapability.Multimedia.Media.VideoPlayer

| Name                           | Type                                                  | Read-Only| Optional| Description                                                        |
| ------------------------------- | ------------------------------------------------------ | ---- | ---- | ------------------------------------------------------------ |
| url<sup>8+</sup>                | string                                                 | No  | No  | Video URL. The video formats MP4, MPEG-TS, and MKV are supported.<br>**Example of supported URLs**:<br>1. FD: fd://xx<br>![](figures/en-us_image_url.png)<br>2. HTTP: http\://xx<br>3. HTTPS: https\://xx<br>4. HLS: http\://xx or https\://xx<br>5. File type: file\://xx<br>**NOTE**<br>WebM is no longer supported since API version 11.|
| fdSrc<sup>9+</sup>              | [AVFileDescriptor](#avfiledescriptor9)                 | No  | No  | Description of a video file. This attribute is required when video assets of an application are continuously stored in a file.<br>**Example:**<br>Assume that a music file that stores continuous music assets consists of the following:<br>Video 1 (address offset: 0, byte length: 100)<br>Video 2 (address offset: 101; byte length: 50)<br>Video 3 (address offset: 151, byte length: 150)<br>1. To play video 1: AVFileDescriptor {fd = resource handle; offset = 0; length = 100; }<br>2. To play video 2: AVFileDescriptor {fd = resource handle; offset = 101; length = 50; }<br>3. To play video 3: AVFileDescriptor {fd = resource handle; offset = 151; length = 150; }<br>To play an independent video file, use **src=fd://xx**.<br>|
| loop<sup>8+</sup>               | boolean                                                | No  | No  | Whether to loop video playback. The value **true** means to loop video playback, and **false** means the opposite.                |
| videoScaleType<sup>9+</sup>     | [VideoScaleType](#videoscaletype9)                     | No  | Yes  | Video scale type. The default value is **VIDEO_SCALE_TYPE_FIT**.                                              |
| audioInterruptMode<sup>9+</sup> | [audio.InterruptMode](../apis-audio-kit/js-apis-audio.md#interruptmode9) | No  | Yes  | Audio interruption mode.                                              |
| currentTime<sup>8+</sup>        | number                                                 | Yes  | No  | Current video playback position, in ms.                      |
| duration<sup>8+</sup>           | number                                                 | Yes  | No  | Video duration, in ms. The value **-1** indicates the live mode.            |
| state<sup>8+</sup>              | [VideoPlayState](#videoplaystatedeprecated)                    | Yes  | No  | Video playback state.                                            |
| width<sup>8+</sup>              | number                                                 | Yes  | No  | Video width, in px.                                  |
| height<sup>8+</sup>             | number                                                 | Yes  | No  | Video height, in px.                                  |

### setDisplaySurface<sup>(deprecated)</sup>

setDisplaySurface(surfaceId: string, callback: AsyncCallback\<void>): void

Sets a surface ID. This API uses an asynchronous callback to return the result.

*Note: **SetDisplaySurface** must be called between the URL setting and the calling of **prepare**. A surface must be set for video streams without audio. Otherwise, the calling of **prepare** fails.

> **NOTE**
>
> This API is supported since API version 8 and deprecated since API version 9. You are advised to use [AVPlayer.surfaceId](#attributes) instead.

**System capability**: SystemCapability.Multimedia.Media.VideoPlayer

**Parameters**

| Name   | Type                | Mandatory| Description                     |
| --------- | -------------------- | ---- | ------------------------- |
| surfaceId | string               | Yes  | Surface ID to set.                |
| callback  | AsyncCallback\<void> | Yes  | Callback used to return the result. If the setting is successful, **err** is **undefined**. Otherwise, **err** is an error object.|

**Example**

```ts
import { BusinessError } from '@kit.BasicServicesKit';

let surfaceId: string = '';
videoPlayer.setDisplaySurface(surfaceId, (err: BusinessError) => {
  if (err) {
    console.error('Failed to set DisplaySurface!');
  } else {
    console.info('Succeeded in setting DisplaySurface!');
  }
});
```

### setDisplaySurface<sup>(deprecated)</sup>

setDisplaySurface(surfaceId: string): Promise\<void>

Sets a surface ID. This API uses a promise to return the result.

*Note: **SetDisplaySurface** must be called between the URL setting and the calling of **prepare**. A surface must be set for video streams without audio. Otherwise, the calling of **prepare** fails.

> **NOTE**
>
> This API is supported since API version 8 and deprecated since API version 9. You are advised to use [AVPlayer.surfaceId](#attributes) instead.

**System capability**: SystemCapability.Multimedia.Media.VideoPlayer

**Parameters**

| Name   | Type  | Mandatory| Description     |
| --------- | ------ | ---- | --------- |
| surfaceId | string | Yes  | Surface ID to set.|

**Return value**

| Type          | Description                          |
| -------------- | ------------------------------ |
| Promise\<void> | Promise that returns no value.|

**Example**

```ts
import { BusinessError } from '@kit.BasicServicesKit';

let surfaceId: string = '';
videoPlayer.setDisplaySurface(surfaceId).then(() => {
  console.info('Succeeded in setting DisplaySurface');
}).catch((error: BusinessError) => {
  console.error(`video catchCallback, error:${error}`);
});
```

### prepare<sup>(deprecated)</sup>

prepare(callback: AsyncCallback\<void>): void

Prepares for video playback. This API uses an asynchronous callback to return the result.

> **NOTE**
>
> This API is supported since API version 8 and deprecated since API version 9. You are advised to use [AVPlayer.prepare](#prepare9) instead.

**System capability**: SystemCapability.Multimedia.Media.VideoPlayer

**Parameters**

| Name  | Type                | Mandatory| Description                    |
| -------- | -------------------- | ---- | ------------------------ |
| callback | AsyncCallback\<void> | Yes  | Callback used to return the result. If the operation is successful, **err** is **undefined**; otherwise, **err** is an error object.|

**Example**

```ts
import { BusinessError } from '@kit.BasicServicesKit';

videoPlayer.prepare((err: BusinessError) => {
  if (err) {
    console.error('Failed to prepare!');
  } else {
    console.info('Succeeded in preparing!');
  }
});
```

### prepare<sup>(deprecated)</sup>

prepare(): Promise\<void>

Prepares for video playback. This API uses a promise to return the result.

> **NOTE**
>
> This API is supported since API version 8 and deprecated since API version 9. You are advised to use [AVPlayer.prepare](#prepare9-1) instead.

**System capability**: SystemCapability.Multimedia.Media.VideoPlayer

**Return value**

| Type          | Description                         |
| -------------- | ----------------------------- |
| Promise\<void> | Promise that returns no value.|

**Example**

```ts
import { BusinessError } from '@kit.BasicServicesKit';

videoPlayer.prepare().then(() => {
  console.info('Succeeded in preparing');
}).catch((error: BusinessError) => {
  console.error(`video catchCallback, error:${error}`);
});
```

### play<sup>(deprecated)</sup>

play(callback: AsyncCallback\<void>): void

Starts video playback. This API uses an asynchronous callback to return the result.

> **NOTE**
>
> This API is supported since API version 8 and deprecated since API version 9. You are advised to use [AVPlayer.play](#play9) instead.

**System capability**: SystemCapability.Multimedia.Media.VideoPlayer

**Parameters**

| Name  | Type                | Mandatory| Description                    |
| -------- | -------------------- | ---- | ------------------------ |
| callback | AsyncCallback\<void> | Yes  | Callback used to return the result. If the operation is successful, **err** is **undefined**; otherwise, **err** is an error object.|

**Example**

```ts
import { BusinessError } from '@kit.BasicServicesKit';

videoPlayer.play((err: BusinessError) => {
  if (err) {
    console.error('Failed to play!');
  } else {
    console.info('Succeeded in playing!');
  }
});
```

### play<sup>(deprecated)</sup>

play(): Promise\<void>

Starts video playback. This API uses a promise to return the result.

> **NOTE**
>
> This API is supported since API version 8 and deprecated since API version 9. You are advised to use [AVPlayer.play](#play9-1) instead.

**System capability**: SystemCapability.Multimedia.Media.VideoPlayer

**Return value**

| Type          | Description                         |
| -------------- | ----------------------------- |
| Promise\<void> | Promise that returns no value.|

**Example**

```ts
import { BusinessError } from '@kit.BasicServicesKit';

videoPlayer.play().then(() => {
  console.info('Succeeded in playing');
}).catch((error: BusinessError) => {
  console.error(`video catchCallback, error:${error}`);
});
```

### pause<sup>(deprecated)</sup>

pause(callback: AsyncCallback\<void>): void

Pauses video playback. This API uses an asynchronous callback to return the result.

> **NOTE**
> This API is supported since API version 8 and deprecated since API version 9. You are advised to use [AVPlayer.pause](#pause9) instead.

**System capability**: SystemCapability.Multimedia.Media.VideoPlayer

**Parameters**

| Name  | Type                | Mandatory| Description                    |
| -------- | -------------------- | ---- | ------------------------ |
| callback | AsyncCallback\<void> | Yes  | Callback used to return the result. If the operation is successful, **err** is **undefined**; otherwise, **err** is an error object.|

**Example**

```ts
import { BusinessError } from '@kit.BasicServicesKit';

videoPlayer.pause((err: BusinessError) => {
  if (err) {
    console.error('Failed to pause!');
  } else {
    console.info('Succeeded in pausing!');
  }
});
```

### pause<sup>(deprecated)</sup>

pause(): Promise\<void>

Pauses video playback. This API uses a promise to return the result.

> **NOTE**
>
> This API is supported since API version 8 and deprecated since API version 9. You are advised to use [AVPlayer.pause](#pause9-1) instead.

**System capability**: SystemCapability.Multimedia.Media.VideoPlayer

**Return value**

| Type          | Description                         |
| -------------- | ----------------------------- |
| Promise\<void> | Promise that returns no value.|

**Example**

```ts
import { BusinessError } from '@kit.BasicServicesKit';

videoPlayer.pause().then(() => {
  console.info('Succeeded in pausing');
}).catch((error: BusinessError) => {
  console.error(`video catchCallback, error:${error}`);
});
```

### stop<sup>(deprecated)</sup>

stop(callback: AsyncCallback\<void>): void

Stops video playback. This API uses an asynchronous callback to return the result.

> **NOTE**
>
> This API is supported since API version 8 and deprecated since API version 9. You are advised to use [AVPlayer.stop](#stop9) instead.

**System capability**: SystemCapability.Multimedia.Media.VideoPlayer

**Parameters**

| Name  | Type                | Mandatory| Description                    |
| -------- | -------------------- | ---- | ------------------------ |
| callback | AsyncCallback\<void> | Yes  | Callback used to return the result. If the operation is successful, **err** is **undefined**; otherwise, **err** is an error object.|

**Example**

```ts
import { BusinessError } from '@kit.BasicServicesKit';

videoPlayer.stop((err: BusinessError) => {
  if (err) {
    console.error('Failed to stop!');
  } else {
    console.info('Succeeded in stopping!');
  }
});
```

### stop<sup>(deprecated)</sup>

stop(): Promise\<void>

Stops video playback. This API uses a promise to return the result.

> **NOTE**
>
> This API is supported since API version 8 and deprecated since API version 9. You are advised to use [AVPlayer.stop](#stop9-1) instead.

**System capability**: SystemCapability.Multimedia.Media.VideoPlayer

**Return value**

| Type          | Description                         |
| -------------- | ----------------------------- |
| Promise\<void> | Promise that returns no value.|

**Example**

```ts
import { BusinessError } from '@kit.BasicServicesKit';

videoPlayer.stop().then(() => {
  console.info('Succeeded in stopping');
}).catch((error: BusinessError) => {
  console.error(`video catchCallback, error:${error}`);
});
```

### reset<sup>(deprecated)</sup>

reset(callback: AsyncCallback\<void>): void

Resets video playback. This API uses an asynchronous callback to return the result.

> **NOTE**
>
> This API is supported since API version 8 and deprecated since API version 9. You are advised to use [AVPlayer.reset](#reset9) instead.

**System capability**: SystemCapability.Multimedia.Media.VideoPlayer

**Parameters**

| Name  | Type                | Mandatory| Description                    |
| -------- | -------------------- | ---- | ------------------------ |
| callback | AsyncCallback\<void> | Yes  | Callback used to return the result. If the operation is successful, **err** is **undefined**; otherwise, **err** is an error object.|

**Example**

```ts
import { BusinessError } from '@kit.BasicServicesKit';

videoPlayer.reset((err: BusinessError) => {
  if (err) {
    console.error('Failed to reset!');
  } else {
    console.info('Succeeded in resetting!');
  }
});
```

### reset<sup>(deprecated)</sup>

reset(): Promise\<void>

Resets video playback. This API uses a promise to return the result.

> **NOTE**
>
> This API is supported since API version 8 and deprecated since API version 9. You are advised to use [AVPlayer.reset](#reset9-1) instead.

**System capability**: SystemCapability.Multimedia.Media.VideoPlayer

**Return value**

| Type          | Description                         |
| -------------- | ----------------------------- |
| Promise\<void> | Promise that returns no value.|

**Example**

```ts
import { BusinessError } from '@kit.BasicServicesKit';

videoPlayer.reset().then(() => {
  console.info('Succeeded in resetting');
}).catch((error: BusinessError) => {
  console.error(`video catchCallback, error:${error}`);
});
```

### seek<sup>(deprecated)</sup>

seek(timeMs: number, callback: AsyncCallback\<number>): void

Seeks to the specified playback position. The previous key frame at the specified position is played. This API uses an asynchronous callback to return the result.

> **NOTE**
>
> This API is supported since API version 8 and deprecated since API version 9. You are advised to use [AVPlayer.seek](#seek9) instead.

**System capability**: SystemCapability.Multimedia.Media.VideoPlayer

**Parameters**

| Name  | Type                  | Mandatory| Description                                                        |
| -------- | ---------------------- | ---- | ------------------------------------------------------------ |
| timeMs   | number                 | Yes  | Position to seek to, in ms. The value range is [0, duration].|
| callback | AsyncCallback\<number> | Yes  | Callback used to return the result. If the operation is successful, **err** is **undefined** and **data** is the new playback position; otherwise, **err** is an error object.                              |

**Example**

```ts
import { BusinessError } from '@kit.BasicServicesKit';

let videoPlayer: media.VideoPlayer;
media.createVideoPlayer((error: BusinessError, video: media.VideoPlayer) => {
  if (video != null) {
    videoPlayer = video;
    console.info('Succeeded in creating VideoPlayer');
  } else {
    console.error(`Failed to create VideoPlayer, error:${error}`);
  }
});

let seekTime: number = 5000;
videoPlayer.seek(seekTime, (err: BusinessError, result: number) => {
  if (err) {
    console.error('Failed to do seek!');
  } else {
    console.info('Succeeded in doing seek!');
  }
});
```

### seek<sup>(deprecated)</sup>

seek(timeMs: number, mode:SeekMode, callback: AsyncCallback\<number>): void

Seeks to the specified playback position. This API uses an asynchronous callback to return the result.

> **NOTE**
>
> This API is supported since API version 8 and deprecated since API version 9. You are advised to use [AVPlayer.seek](#seek9) instead.

**System capability**: SystemCapability.Multimedia.Media.VideoPlayer

**Parameters**

| Name  | Type                  | Mandatory| Description                                                        |
| -------- | ---------------------- | ---- | ------------------------------------------------------------ |
| timeMs   | number                 | Yes  | Position to seek to, in ms. The value range is [0, duration].|
| mode     | [SeekMode](#seekmode8) | Yes  | Seek mode.                                                  |
| callback | AsyncCallback\<number> | Yes  | Callback used to return the result. If the operation is successful, **err** is **undefined** and **data** is the new playback position; otherwise, **err** is an error object.                              |

**Example**

```ts
import { BusinessError } from '@kit.BasicServicesKit';

let videoPlayer: media.VideoPlayer | null = null;
media.createVideoPlayer((error: BusinessError, video: media.VideoPlayer) => {
  if (video != null) {
    videoPlayer = video;
    console.info('Succeeded in creating VideoPlayer');
  } else {
    console.error(`Failed to create VideoPlayer, error:${error}`);
  }
});
let seekTime: number = 5000;
if (videoPlayer) {
  (videoPlayer as media.VideoPlayer).seek(seekTime, media.SeekMode.SEEK_NEXT_SYNC, (err: BusinessError, result: number) => {
    if (err) {
      console.error('Failed to do seek!');
    } else {
      console.info('Succeeded in doing seek!');
    }
  });
}
```

### seek<sup>(deprecated)</sup>

seek(timeMs: number, mode?:SeekMode): Promise\<number>

Seeks to the specified playback position. If **mode** is not specified, the previous key frame at the specified position is played. This API uses a promise to return the result.

> **NOTE**
>
> This API is supported since API version 8 and deprecated since API version 9. You are advised to use [AVPlayer.seek](#seek9) instead.

**System capability**: SystemCapability.Multimedia.Media.VideoPlayer

**Parameters**

| Name| Type                  | Mandatory| Description                                                        |
| ------ | ---------------------- | ---- | ------------------------------------------------------------ |
| timeMs | number                 | Yes  | Position to seek to, in ms. The value range is [0, duration].|
| mode   | [SeekMode](#seekmode8) | No  | Seek mode based on the video I frame. The default value is **SEEK_PREV_SYNC**.           |

**Return value**

| Type            | Description                                       |
| ---------------- | ------------------------------------------- |
| Promise\<number>| Promise used to return the playback position, in ms.|

**Example**

```ts
import { BusinessError } from '@kit.BasicServicesKit';

let videoPlayer: media.VideoPlayer | null = null;
media.createVideoPlayer((error: BusinessError, video: media.VideoPlayer) => {
  if (video != null) {
    videoPlayer = video;
    console.info('Succeeded in creating VideoPlayer');
  } else {
    console.error(`Failed to create VideoPlayer, error:${error}`);
  }
});
let seekTime: number = 5000;
if (videoPlayer) {
  (videoPlayer as media.VideoPlayer).seek(seekTime).then((seekDoneTime: number) => { // seekDoneTime indicates the position after the seek operation is complete.
    console.info('Succeeded in doing seek');
  }).catch((error: BusinessError) => {
    console.error(`video catchCallback, error:${error}`);
  });

  (videoPlayer as media.VideoPlayer).seek(seekTime, media.SeekMode.SEEK_NEXT_SYNC).then((seekDoneTime: number) => {
    console.info('Succeeded in doing seek');
  }).catch((error: BusinessError) => {
    console.error(`video catchCallback, error:${error}`);
  });
}
```

### setVolume<sup>(deprecated)</sup>

setVolume(vol: number, callback: AsyncCallback\<void>): void

Sets the volume. This API uses an asynchronous callback to return the result.

> **NOTE**
>
> This API is supported since API version 8 and deprecated since API version 9. You are advised to use [AVPlayer.setVolume](#setvolume9) instead.

**System capability**: SystemCapability.Multimedia.Media.VideoPlayer

**Parameters**

| Name  | Type                | Mandatory| Description                                                        |
| -------- | -------------------- | ---- | ------------------------------------------------------------ |
| vol      | number               | Yes  | Relative volume. The value ranges from 0.00 to 1.00. The value **1.00** indicates the maximum volume (100%).|
| callback | AsyncCallback\<void> | Yes  | Callback used to return the result. If the setting is successful, **err** is **undefined**. Otherwise, **err** is an error object.|

**Example**

```ts
import { BusinessError } from '@kit.BasicServicesKit';

let vol: number = 0.5;
videoPlayer.setVolume(vol, (err: BusinessError) => {
  if (err) {
    console.error('Failed to set Volume!');
  } else {
    console.info('Succeeded in setting Volume!');
  }
});
```

### setVolume<sup>(deprecated)</sup>

setVolume(vol: number): Promise\<void>

Sets the volume. This API uses a promise to return the result.

> **NOTE**
>
> This API is supported since API version 8 and deprecated since API version 9. You are advised to use [AVPlayer.setVolume](#setvolume9) instead.

**System capability**: SystemCapability.Multimedia.Media.VideoPlayer

**Parameters**

| Name| Type  | Mandatory| Description                                                        |
| ------ | ------ | ---- | ------------------------------------------------------------ |
| vol    | number | Yes  | Relative volume. The value ranges from 0.00 to 1.00. The value **1.00** indicates the maximum volume (100%).|

**Return value**

| Type          | Description                     |
| -------------- | ------------------------- |
| Promise\<void> | Promise that returns no value.|

**Example**

```ts
import { BusinessError } from '@kit.BasicServicesKit';

let vol: number = 0.5;
videoPlayer.setVolume(vol).then(() => {
  console.info('Succeeded in setting Volume');
}).catch((error: BusinessError) => {
  console.error(`video catchCallback, error:${error}`);
});
```

### release<sup>(deprecated)</sup>

release(callback: AsyncCallback\<void>): void

Releases the video playback resources. This API uses an asynchronous callback to return the result.

> **NOTE**
>
> This API is supported since API version 8 and deprecated since API version 9. You are advised to use [AVPlayer.release](#release9) instead.

**System capability**: SystemCapability.Multimedia.Media.VideoPlayer

**Parameters**

| Name  | Type                | Mandatory| Description                    |
| -------- | -------------------- | ---- | ------------------------ |
| callback | AsyncCallback\<void> | Yes  | Callback used to return the result. If the operation is successful, **err** is **undefined**; otherwise, **err** is an error object.|

**Example**

```ts
import { BusinessError } from '@kit.BasicServicesKit';

videoPlayer.release((err: BusinessError) => {
  if (err) {
    console.error('Failed to release!');
  } else {
    console.info('Succeeded in releasing!');
  }
});
```

### release<sup>(deprecated)</sup>

release(): Promise\<void>

Releases the video playback resources. This API uses a promise to return the result.

> **NOTE**
>
> This API is supported since API version 8 and deprecated since API version 9. You are advised to use [AVPlayer.release](#release9-1) instead.

**System capability**: SystemCapability.Multimedia.Media.VideoPlayer

**Return value**

| Type          | Description                         |
| -------------- | ----------------------------- |
| Promise\<void> | Promise that returns no value.|

**Example**

```ts
import { BusinessError } from '@kit.BasicServicesKit';

videoPlayer.release().then(() => {
  console.info('Succeeded in releasing');
}).catch((error: BusinessError) => {
  console.error(`video catchCallback, error:${error}`);
});
```

### getTrackDescription<sup>(deprecated)</sup>

getTrackDescription(callback: AsyncCallback\<Array\<MediaDescription>>): void

Obtains the video track information. This API uses an asynchronous callback to return the result.

> **NOTE**
>
> This API is supported since API version 8 and deprecated since API version 9. You are advised to use [AVPlayer.getTrackDescription](#gettrackdescription9) instead.

**System capability**: SystemCapability.Multimedia.Media.VideoPlayer

**Parameters**

| Name  | Type                                                        | Mandatory| Description                                      |
| -------- | ------------------------------------------------------------ | ---- | ------------------------------------------ |
| callback | AsyncCallback\<Array\<[MediaDescription](#mediadescription8)>> | Yes  | Callback used to return the result. If the operation is successful, **err** is **undefined** and **data** is the MediaDescription array obtained; otherwise, **err** is an error object.|

**Example**

```ts
import { BusinessError } from '@kit.BasicServicesKit';

videoPlayer.getTrackDescription((error: BusinessError, arrList: Array<media.MediaDescription>) => {
  if ((arrList) != null) {
    console.info('Succeeded in getting TrackDescription');
  } else {
    console.error(`Failed to get TrackDescription, error:${error}`);
  }
});
```

### getTrackDescription<sup>(deprecated)</sup>

getTrackDescription(): Promise\<Array\<MediaDescription>>

Obtains the video track information. This API uses a promise to return the result.

> **NOTE**
>
> This API is supported since API version 8 and deprecated since API version 9. You are advised to use [AVPlayer.getTrackDescription](#gettrackdescription9-1) instead.

**System capability**: SystemCapability.Multimedia.Media.VideoPlayer

**Return value**

| Type                                                  | Description                                           |
| ------------------------------------------------------ | ----------------------------------------------- |
| Promise<Array<[MediaDescription](#mediadescription8)>> | Promise used to return the MediaDescription array that holds the video track information.|

**Example**

```ts
import { BusinessError } from '@kit.BasicServicesKit';

videoPlayer.getTrackDescription().then((arrList: Array<media.MediaDescription>) => {
  if (arrList != null) {
    console.info('Succeeded in getting TrackDescription');
  } else {
    console.error('Failed to get TrackDescription');
  }
}).catch((error: BusinessError) => {
  console.error(`video catchCallback, error:${error}`);
});
```

### setSpeed<sup>(deprecated)</sup>

setSpeed(speed: number, callback: AsyncCallback\<number>): void

Sets the playback speed. This API uses an asynchronous callback to return the result.

> **NOTE**
>
> This API is supported since API version 8 and deprecated since API version 9. You are advised to use [AVPlayer.setSpeed](#setspeed9) instead.

**System capability**: SystemCapability.Multimedia.Media.VideoPlayer

**Parameters**

| Name  | Type                  | Mandatory| Description                                                      |
| -------- | ---------------------- | ---- | ---------------------------------------------------------- |
| speed    | number                 | Yes  | Video playback speed. For details, see [PlaybackSpeed](#playbackspeed8).|
| callback | AsyncCallback\<number> | Yes  | Callback used to return the result. If the operation is successful, **err** is **undefined** and **data** is the playback speed; otherwise, **err** is an error object.                                  |

**Example**

```ts
import { BusinessError } from '@kit.BasicServicesKit';

let videoPlayer: media.VideoPlayer | null = null;
media.createVideoPlayer((error: BusinessError, video: media.VideoPlayer) => {
  if (video != null) {
    videoPlayer = video;
    console.info('Succeeded in creating VideoPlayer');
  } else {
    console.error(`Failed to create VideoPlayer, error:${error}`);
  }
});
let speed = media.PlaybackSpeed.SPEED_FORWARD_2_00_X;
if (videoPlayer) {
  (videoPlayer as media.VideoPlayer).setSpeed(speed, (err: BusinessError, result: number) => {
    if (err) {
      console.error('Failed to set Speed!');
    } else {
      console.info('Succeeded in setting Speed!');
    }
  });
}
```

### setSpeed<sup>(deprecated)</sup>

setSpeed(speed: number): Promise\<number>

Sets the playback speed. This API uses a promise to return the result.

> **NOTE**
>
> This API is supported since API version 8 and deprecated since API version 9. You are advised to use [AVPlayer.setSpeed](#setspeed9) instead.

**System capability**: SystemCapability.Multimedia.Media.VideoPlayer

**Parameters**

| Name| Type  | Mandatory| Description                                                      |
| ------ | ------ | ---- | ---------------------------------------------------------- |
| speed  | number | Yes  | Video playback speed. For details, see [PlaybackSpeed](#playbackspeed8).|

**Return value**

| Type            | Description                                                        |
| ---------------- | ------------------------------------------------------------ |
| Promise\<number>| Promise used to return the playback speed. For details, see [PlaybackSpeed](#playbackspeed8).|

**Example**

```ts
import { BusinessError } from '@kit.BasicServicesKit';

let videoPlayer: media.VideoPlayer | null = null;
media.createVideoPlayer((error: BusinessError, video: media.VideoPlayer) => {
  if (video != null) {
    videoPlayer = video;
    console.info('Succeeded in creating VideoPlayer');
  } else {
    console.error(`Failed to create VideoPlayer, error:${error}`);
  }
});
let speed = media.PlaybackSpeed.SPEED_FORWARD_2_00_X;
if (videoPlayer) {
  (videoPlayer as media.VideoPlayer).setSpeed(speed).then((result: number) => {
    console.info('Succeeded in setting Speed');
  }).catch((error: BusinessError) => {
    console.error(`Failed to set Speed, error:${error}`);//todo:: error
  });
}
```

### on('playbackCompleted')<sup>(deprecated)</sup>

on(type: 'playbackCompleted', callback: Callback\<void>): void

Subscribes to the video playback completion event.

> **NOTE**
>
> This API is supported since API version 8 and deprecated since API version 9. You are advised to use [AVPlayer.on('stateChange')](#onstatechange9) instead.

**System capability**: SystemCapability.Multimedia.Media.VideoPlayer

**Parameters**

| Name  | Type    | Mandatory| Description                                                       |
| -------- | -------- | ---- | ----------------------------------------------------------- |
| type     | string   | Yes  | Event type, which is **'playbackCompleted'** in this case.|
| callback | Callback\<void> | Yes  | Callback invoked when the event is triggered.                                 |

**Example**

```ts
videoPlayer.on('playbackCompleted', () => {
  console.info('playbackCompleted called!');
});
```

### on('bufferingUpdate')<sup>(deprecated)</sup>

on(type: 'bufferingUpdate', callback: (infoType: BufferingInfoType, value: number) => void): void

Subscribes to the video buffering update event. This API works only under online playback.

> **NOTE**
>
> This API is supported since API version 8 and deprecated since API version 9. You are advised to use [AVPlayer.on('bufferingUpdate')](#onbufferingupdate9) instead.

**System capability**: SystemCapability.Multimedia.Media.VideoPlayer

**Parameters**

| Name  | Type    | Mandatory| Description                                                        |
| -------- | -------- | ---- | ------------------------------------------------------------ |
| type     | string   | Yes  | Event type, which is **'bufferingUpdate'** in this case.       |
| callback | function | Yes  | Callback invoked when the event is triggered.<br>The value of [BufferingInfoType](#bufferinginfotype8) is fixed at **0**.|

**Example**

```ts
videoPlayer.on('bufferingUpdate', (infoType: media.BufferingInfoType, value: number) => {
  console.info('video bufferingInfo type: ' + infoType);
  console.info('video bufferingInfo value: ' + value);
});
```

### on('startRenderFrame')<sup>(deprecated)</sup>

on(type: 'startRenderFrame', callback: Callback\<void>): void

Subscribes to the frame rendering start event.

> **NOTE**
>
> This API is supported since API version 8 and deprecated since API version 9. You are advised to use [AVPlayer.on('startRenderFrame')](#onstartrenderframe9) instead.

**System capability**: SystemCapability.Multimedia.Media.VideoPlayer

**Parameters**

| Name  | Type           | Mandatory| Description                                                        |
| -------- | --------------- | ---- | ------------------------------------------------------------ |
| type     | string          | Yes  | Event type, which is **'startRenderFrame'** in this case.|
| callback | Callback\<void> | Yes  | Callback invoked when the event is triggered.                          |

**Example**

```ts
videoPlayer.on('startRenderFrame', () => {
  console.info('startRenderFrame called!');
});
```

### on('videoSizeChanged')<sup>(deprecated)</sup>

on(type: 'videoSizeChanged', callback: (width: number, height: number) => void): void

Subscribes to the video width and height change event.

> **NOTE**
> This API is supported since API version 8 and deprecated since API version 9. You are advised to use [AVPlayer.on('videoSizeChange')](#onvideosizechange9) instead.

**System capability**: SystemCapability.Multimedia.Media.VideoPlayer

**Parameters**

| Name  | Type    | Mandatory| Description                                                        |
| -------- | -------- | ---- | ------------------------------------------------------------ |
| type     | string   | Yes  | Event type, which is **'videoSizeChanged'** in this case.|
| callback | function | Yes  | Callback invoked when the event is triggered. **width** indicates the video width, and **height** indicates the video height.   |

**Example**

```ts
videoPlayer.on('videoSizeChanged', (width: number, height: number) => {
  console.info('video width is: ' + width);
  console.info('video height is: ' + height);
});
```
### on('audioInterrupt')<sup>(deprecated)</sup>

on(type: 'audioInterrupt', callback: (info: audio.InterruptEvent) => void): void

Subscribes to the audio interruption event. For details, see [audio.InterruptEvent](../apis-audio-kit/js-apis-audio.md#interruptevent9).

> **NOTE**
>
> This API is supported in API version 9 and deprecated since API version 9. You are advised to use [AVPlayer.on('audioInterrupt')](#onaudiointerrupt9) instead.

**System capability**: SystemCapability.Multimedia.Media.VideoPlayer

**Parameters**

| Name  | Type                                                        | Mandatory| Description                                                    |
| -------- | ------------------------------------------------------------ | ---- | -------------------------------------------------------- |
| type     | string                                                       | Yes  | Event type, which is **'audioInterrupt'** in this case.|
| callback | function | Yes  | Callback invoked when the event is triggered.                              |

**Example**

```ts
import { audio } from '@kit.AudioKit';

videoPlayer.on('audioInterrupt', (info: audio.InterruptEvent) => {
  console.info('audioInterrupt called,and InterruptEvent info is:' + info)
})
```

### on('error')<sup>(deprecated)</sup>

on(type: 'error', callback: ErrorCallback): void

Subscribes to video playback error events. After an error event is reported, you must handle the event and exit the playback.

> **NOTE**
>
> This API is supported since API version 8 and deprecated since API version 9. You are advised to use [AVPlayer.on('error')](#onerror9) instead.

**System capability**: SystemCapability.Multimedia.Media.VideoPlayer

**Parameters**

| Name  | Type         | Mandatory| Description                                                        |
| -------- | ------------- | ---- | ------------------------------------------------------------ |
| type     | string        | Yes  | Event type, which is **'error'** in this case.<br>This event is triggered when an error occurs during video playback.|
| callback | [ErrorCallback](../apis-basic-services-kit/js-apis-base.md#errorcallback) | Yes  | Callback invoked when the event is triggered.                                      |

**Example**

```ts
import { BusinessError } from '@kit.BasicServicesKit';

videoPlayer.on('error', (error: BusinessError) => {  // Set the 'error' event callback.
  console.error(`video error called, error: ${error}`);
});
videoPlayer.url = 'fd://error';  // Set an incorrect URL to trigger the 'error' event.
```

## VideoPlayState<sup>(deprecated)</sup>

type VideoPlayState = 'idle' | 'prepared' | 'playing' | 'paused' | 'stopped' | 'error'

Enumerates the video playback states. You can obtain the state through the **state** attribute.

> **NOTE**
>
> This API is supported since API version 8 and deprecated since API version 9. You are advised to use [AVPlayerState](#avplayerstate9) instead.

**System capability**: SystemCapability.Multimedia.Media.VideoPlayer

| Type    | Description          |
| -------- | -------------- |
| 'idle'     | The video player is idle.|
| 'prepared' | Video playback is being prepared.|
| 'playing'  | Video playback is in progress.|
| 'paused'   | Video playback is paused.|
| 'stopped'  | Video playback is stopped.|
| 'error'    | Video playback is in the error state.    |

## AudioRecorder<sup>(deprecated)</sup>

> **NOTE**
>
> This API is supported since API version 6 and deprecated since API version 9. You are advised to use [AVRecorder](#avrecorder9) instead.

Implements audio recording. Before calling any API of **AudioRecorder**, you must use [createAudioRecorder()](#mediacreateaudiorecorderdeprecated) to create an **AudioRecorder** instance.

### prepare<sup>(deprecated)</sup>

prepare(config: AudioRecorderConfig): void

Prepares for recording.

> **NOTE**
>
> This API is supported since API version 6 and deprecated since API version 9. You are advised to use [AVRecorder.prepare](#prepare9-2) instead.

**Required permissions:** ohos.permission.MICROPHONE

**System capability**: SystemCapability.Multimedia.Media.AudioRecorder

**Parameters**

| Name| Type                                       | Mandatory| Description                                                        |
| ------ | ------------------------------------------- | ---- | ------------------------------------------------------------ |
| config | [AudioRecorderConfig](#audiorecorderconfigdeprecated) | Yes  | Audio recording parameters, including the audio output URI, encoding format, sampling rate, number of audio channels, and output format.|

**Error codes**

For details about the error codes, see [Media Error Codes](errorcode-media.md).

| ID| Error Message             |
| -------- | --------------------- |
| 201      | permission denied     |

**Example**

```ts
let audioRecorderConfig: media.AudioRecorderConfig = {
  audioEncoder : media.AudioEncoder.AAC_LC,
  audioEncodeBitRate : 22050,
  audioSampleRate : 22050,
  numberOfChannels : 2,
  format : media.AudioOutputFormat.AAC_ADTS,
  uri : 'fd://1',       // The file must be created by the caller and granted with proper permissions.
  location : { latitude : 30, longitude : 130},
}
audioRecorder.on('prepare', () => {    // Set the 'prepare' event callback.
  console.info('prepare called');
});
audioRecorder.prepare(audioRecorderConfig);
```

### start<sup>(deprecated)</sup>

start(): void

Starts audio recording. This API can be called only after the **'prepare'** event is triggered.

> **NOTE**
>
> This API is supported since API version 6 and deprecated since API version 9. You are advised to use [AVRecorder.start](#start9) instead.

**System capability**: SystemCapability.Multimedia.Media.AudioRecorder

**Example**

```ts
audioRecorder.on('start', () => {    // Set the 'start' event callback.
  console.info('audio recorder start called');
});
audioRecorder.start();
```

### pause<sup>(deprecated)</sup>

pause():void

Pauses audio recording. This API can be called only after the **'start'** event is triggered.

> **NOTE**
>
> This API is supported since API version 6 and deprecated since API version 9. You are advised to use [AVRecorder.pause](#pause9-2) instead.

**System capability**: SystemCapability.Multimedia.Media.AudioRecorder

**Example**

```ts
audioRecorder.on('pause', () => {    // Set the 'pause' event callback.
  console.info('audio recorder pause called');
});
audioRecorder.pause();
```

### resume<sup>(deprecated)</sup>

resume():void

Resumes audio recording. This API can be called only after the **'pause'** event is triggered.

> **NOTE**
>
> This API is supported since API version 6 and deprecated since API version 9. You are advised to use [AVRecorder.resume](#resume9) instead.

**System capability**: SystemCapability.Multimedia.Media.AudioRecorder

**Example**

```ts
audioRecorder.on('resume', () => { // Set the 'resume' event callback.
  console.info('audio recorder resume called');
});
audioRecorder.resume();
```

### stop<sup>(deprecated)</sup>

stop(): void

Stops audio recording.

> **NOTE**
>
> This API is supported since API version 6 and deprecated since API version 9. You are advised to use [AVRecorder.stop](#stop9-2) instead.

**System capability**: SystemCapability.Multimedia.Media.AudioRecorder

**Example**

```ts
audioRecorder.on('stop', () => {    // Set the 'stop' event callback.
  console.info('audio recorder stop called');
});
audioRecorder.stop();
```

### release<sup>(deprecated)</sup>

release(): void

Releases the audio recording resources.

> **NOTE**
>
> This API is supported since API version 6 and deprecated since API version 9. You are advised to use [AVRecorder.release](#release9-2) instead.

**System capability**: SystemCapability.Multimedia.Media.AudioRecorder

**Example**

```ts
audioRecorder.on('release', () => {    // Set the 'release' event callback.
  console.info('audio recorder release called');
});
audioRecorder.release();
audioRecorder = undefined;
```

### reset<sup>(deprecated)</sup>

reset(): void

Resets audio recording.

Before resetting audio recording, you must call **stop()** to stop recording. After audio recording is reset, you must call **prepare()** to set the recording configurations for another recording.

> **NOTE**
>
> This API is supported since API version 6 and deprecated since API version 9. You are advised to use [AVRecorder.reset](#reset9-2) instead.

**System capability**: SystemCapability.Multimedia.Media.AudioRecorder

**Example**

```ts
audioRecorder.on('reset', () => {    // Set the 'reset' event callback.
  console.info('audio recorder reset called');
});
audioRecorder.reset();
```

### on('prepare' | 'start' | 'pause' | 'resume' | 'stop' | 'release' | 'reset')<sup>(deprecated)</sup>

on(type: 'prepare' | 'start' | 'pause' | 'resume' | 'stop' | 'release' | 'reset', callback: () => void): void

Subscribes to the audio recording events.

> **NOTE**
>
> This API is supported since API version 6 and deprecated since API version 9. You are advised to use [AVRecorder.on('stateChange')](#onstatechange9-1) instead.

**System capability**: SystemCapability.Multimedia.Media.AudioRecorder

**Parameters**

| Name  | Type    | Mandatory| Description                                                        |
| -------- | -------- | ---- | ------------------------------------------------------------ |
| type     | string   | Yes  | Event type. The following events are supported: 'prepare'\|'start'\|  'pause' \| 'resume' \|'stop'\|'release'\|'reset'<br>- 'prepare': triggered when the **prepare()** API is called and the audio recording parameters are set.<br>- 'start': triggered when the **start()** API is called and audio recording starts.<br>- 'pause': triggered when the **pause()** API is called and audio recording is paused.<br>- 'resume': triggered when the **resume()** API is called and audio recording is resumed.<br>- 'stop': triggered when the **stop()** API is called and audio recording stops.<br>- 'release': triggered when the **release()** API is called and the recording resources are released.<br>- 'reset': triggered when the **reset()** API is called and audio recording is reset.|
| callback | ()=>void | Yes  | Callback invoked when the event is triggered.                                          |

**Example**

```ts
import { BusinessError } from '@kit.BasicServicesKit';

let audioRecorder: media.AudioRecorder = media.createAudioRecorder(); // Create an AudioRecorder instance.
let audioRecorderConfig: media.AudioRecorderConfig = {
  audioEncoder : media.AudioEncoder.AAC_LC,
  audioEncodeBitRate : 22050,
  audioSampleRate : 22050,
  numberOfChannels : 2,
  format : media.AudioOutputFormat.AAC_ADTS,
  uri : 'fd://xx',  // The file must be created by the caller and granted with proper permissions.
  location : { latitude : 30, longitude : 130}
}
audioRecorder.on('error', (error: BusinessError) => {  // Set the 'error' event callback.
  console.error(`audio error called, error: ${error}`);
});
audioRecorder.on('prepare', () => {  // Set the 'prepare' event callback.
  console.info('prepare called');
  audioRecorder.start();  // // Start recording and trigger the 'start' event callback.
});
audioRecorder.on('start', () => {  // Set the 'start' event callback.
  console.info('audio recorder start called');
});
audioRecorder.on('pause', () => {  // Set the 'pause' event callback.
  console.info('audio recorder pause called');
});
audioRecorder.on('resume', () => {  // Set the 'resume' event callback.
  console.info('audio recorder resume called');
});
audioRecorder.on('stop', () => {  // Set the 'stop' event callback.
  console.info('audio recorder stop called');
});
audioRecorder.on('release', () => {  // Set the 'release' event callback.
  console.info('audio recorder release called');
});
audioRecorder.on('reset', () => {  // Set the 'reset' event callback.
  console.info('audio recorder reset called');
});
audioRecorder.prepare(audioRecorderConfig)  // // Set recording parameters and trigger the 'prepare' event callback.
```

### on('error')<sup>(deprecated)</sup>

on(type: 'error', callback: ErrorCallback): void

Subscribes to audio recording error events. After an error event is reported, you must handle the event and exit the recording.

> **NOTE**
>
> This API is supported since API version 6 and deprecated since API version 9. You are advised to use [AVRecorder.on('error')](#onerror9-1) instead.

**System capability**: SystemCapability.Multimedia.Media.AudioRecorder

**Parameters**

| Name  | Type         | Mandatory| Description                                                        |
| -------- | ------------- | ---- | ------------------------------------------------------------ |
| type     | string        | Yes  | Event type, which is **'error'** in this case.<br>This event is triggered when an error occurs during audio recording.|
| callback | [ErrorCallback](../apis-basic-services-kit/js-apis-base.md#errorcallback) | Yes  | Callback invoked when the event is triggered.                                      |

**Example**

```ts
import { BusinessError } from '@kit.BasicServicesKit';

let audioRecorderConfig: media.AudioRecorderConfig = {
  audioEncoder : media.AudioEncoder.AAC_LC,
  audioEncodeBitRate : 22050,
  audioSampleRate : 22050,
  numberOfChannels : 2,
  format : media.AudioOutputFormat.AAC_ADTS,
  uri : 'fd://xx',   // The file must be created by the caller and granted with proper permissions.
  location : { latitude : 30, longitude : 130}
}
audioRecorder.on('error', (error: BusinessError) => {  // Set the 'error' event callback.
  console.error(`audio error called, error: ${error}`);
});
audioRecorder.prepare(audioRecorderConfig);  // // Do not set any parameter in prepare and trigger the 'error' event callback.
```

## AudioRecorderConfig<sup>(deprecated)</sup>

> **NOTE**
>
> This API is supported since API version 6 and deprecated since API version 9. You are advised to use [AVRecorderConfig](#avrecorderconfig9) instead.

Describes audio recording configurations.

**System capability**: SystemCapability.Multimedia.Media.AudioRecorder

| Name                               | Type                                        | Mandatory| Description                                                        |
| ----------------------------------- | -------------------------------------------- | ---- | ------------------------------------------------------------ |
| audioEncoder                        | [AudioEncoder](#audioencoderdeprecated)                | No  | Audio encoding format. The default value is **AAC_LC**.<br>**Note**: This parameter is deprecated since API version 8. Use **audioEncoderMime** instead.|
| audioEncodeBitRate                  | number                                       | No  | Audio encoding bit rate. The default value is **48000**.                             |
| audioSampleRate                     | number                                       | No  | Audio sampling rate. The default value is **48000**.<br>Variable bit rate. The bit rate is for reference only.                             |
| numberOfChannels                    | number                                       | No  | Number of audio channels. The default value is **2**.                                 |
| format                              | [AudioOutputFormat](#audiooutputformatdeprecated)      | No  | Audio output format. The default value is **MPEG_4**.<br>**Note**: This parameter is deprecated since API version 8. Use **fileFormat** instead.|
| location                            | [Location](#location)                        | No  | Geographical location of the recorded audio.                                        |
| uri                                 | string                                       | Yes  | Audio output URI. Supported: fd://xx (fd number)<br>![](figures/en-us_image_url.png) <br>The file must be created by the caller and granted with proper permissions.|
| audioEncoderMime<sup>8+</sup>       | [CodecMimeType](#codecmimetype8)             | No  | Container encoding format.                                              |
| fileFormat<sup>8+</sup>             | [ContainerFormatType](#containerformattype8) | No  | Audio encoding format.                                              |

## AudioEncoder<sup>(deprecated)</sup>

> **NOTE**
>
> This API is supported since API version 6 and deprecated since API version 8. You are advised to use [CodecMimeType](#codecmimetype8) instead.

Enumerates the audio encoding formats.

**System capability**: SystemCapability.Multimedia.Media.AudioRecorder

| Name   | Value  | Description                                                        |
| ------- | ---- | ------------------------------------------------------------ |
| DEFAULT | 0    | Default encoding format.<br>This API is defined but not implemented yet.             |
| AMR_NB  | 1    | AMR-NB.<br>This API is defined but not implemented yet.|
| AMR_WB  | 2    | Adaptive Multi Rate-Wide Band Speech Codec (AMR-WB).<br>This API is defined but not implemented yet.|
| AAC_LC  | 3    | Advanced Audio Coding Low Complexity (AAC-LC).|
| HE_AAC  | 4    | High-Efficiency Advanced Audio Coding (HE_AAC).<br>This API is defined but not implemented yet.|

## AudioOutputFormat<sup>(deprecated)</sup>

> **NOTE**
>
> This API is supported since API version 6 and deprecated since API version 8. You are advised to use [ContainerFormatType](#containerformattype8) instead.

Enumerates the audio output formats.

**System capability**: SystemCapability.Multimedia.Media.AudioRecorder

| Name    | Value  | Description                                                        |
| -------- | ---- | ------------------------------------------------------------ |
| DEFAULT  | 0    | Default output format.<br>This API is defined but not implemented yet.             |
| MPEG_4   | 2    | MPEG-4.                                          |
| AMR_NB   | 3    | AMR_NB.<br>This API is defined but not implemented yet.         |
| AMR_WB   | 4    | AMR_WB.<br>This API is defined but not implemented yet.         |
| AAC_ADTS | 6    | Audio Data Transport Stream (ADTS), which is a transport stream format of AAC-based audio.|


## media.createAVImageGenerator<sup>12+</sup>

createAVImageGenerator(callback: AsyncCallback\<AVImageGenerator>): void

Creates an **AVImageGenerator** instance. This API uses an asynchronous callback to return the result.

**System capability**: SystemCapability.Multimedia.Media.AVImageGenerator

**Parameters**

| Name  | Type                                 | Mandatory| Description                                                        |
| -------- | ------------------------------------- | ---- | ------------------------------------------------------------ |
| callback | AsyncCallback\<[AVImageGenerator](#avimagegenerator12)> | Yes  | Callback used to return the result. If the operation is successful, an **AVImageGenerator** instance is returned; otherwise, **null** is returned. The API can be used to obtain a video thumbnail.|

**Error codes**

For details about the error codes, see [Media Error Codes](errorcode-media.md).

| ID| Error Message                      |
| -------- | ------------------------------ |
| 5400101  | No memory. Returned by callback. |

**Example**

```ts
import { BusinessError } from '@kit.BasicServicesKit';

let avImageGenerator: media.AVImageGenerator;
media.createAVImageGenerator((error: BusinessError, generator: media.AVImageGenerator) => {
  if (generator != null) {
    avImageGenerator = generator;
    console.info('Succeeded in creating AVImageGenerator');
  } else {
    console.error(`Failed to creat AVImageGenerator, error message:${error.message}`);
  }
});
```

## media.createAVImageGenerator<sup>12+</sup>

createAVImageGenerator(): Promise\<AVImageGenerator>

Creates an **AVImageGenerator** instance. This API uses a promise to return the result.

**System capability**: SystemCapability.Multimedia.Media.AVImageGenerator

**Return value**

| Type                           | Description                                                        |
| ------------------------------- | ------------------------------------------------------------ |
| Promise\<[AVImageGenerator](#avimagegenerator12)> | Promise used to return the result. If the operation is successful, an **AVImageGenerator** instance is returned; otherwise, **null** is returned. The API can be used to obtain a video thumbnail.|

**Error codes**

For details about the error codes, see [Media Error Codes](errorcode-media.md).

| ID| Error Message                     |
| -------- | ----------------------------- |
| 5400101  | No memory. Returned by promise. |

**Example**

```ts
import { BusinessError } from '@kit.BasicServicesKit';

let avImageGenerator: media.AVImageGenerator;
media.createAVImageGenerator().then((generator: media.AVImageGenerator) => {
  if (generator != null) {
    avImageGenerator = generator;
    console.info('Succeeded in creating AVImageGenerator');
  } else {
    console.error('Failed to creat AVImageGenerator');
  }
}).catch((error: BusinessError) => {
  console.error(`Failed to creat AVImageGenerator, error message:${error.message}`);
});
```

## AVImageGenerator<sup>12+</sup>

Provides APIs to obtain a thumbnail from a video. Before calling any API of **AVImageGenerator**, you must use [createAVImageGenerator()](#mediacreateavimagegenerator12) to create an **AVImageGenerator** instance.

For details about the demo for obtaining video thumbnails, see [Obtaining Video Thumbnails](../../media/media/avimagegenerator.md).

### Attributes

**System capability**: SystemCapability.Multimedia.Media.AVImageGenerator

| Name                                               | Type                                                        | Readable| Writable| Description                                                        |
| --------------------------------------------------- | ------------------------------------------------------------ | ---- | ---- | ------------------------------------------------------------ |
| fdSrc<sup>12+</sup>                                  | [AVFileDescriptor](js-apis-media.md#avfiledescriptor9)                       | Yes  | Yes  | Media file descriptor, which specifies the data source.<br>**Example:**<br>There is a media file that stores continuous assets, the address offset is 0, and the byte length is 100. Its file descriptor is **AVFileDescriptor {fd = resourceHandle; offset = 0; length = 100; }**.<br>**NOTE**<br> - After the resource handle (FD) is transferred to an **AVImageGenerator** instance, do not use the resource handle to perform other read and write operations, including but not limited to transferring this handle to other **AVPlayer**, **AVMetadataExtractor**, **AVImageGenerator**, or **AVTranscoder** instance. Competition occurs when multiple AVImageGenerator use the same resource handle to read and write files at the same time, resulting in errors in obtaining data.|

### fetchFrameByTime<sup>12+</sup>

fetchFrameByTime(timeUs: number, options: AVImageQueryOptions, param: PixelMapParams, callback: AsyncCallback\<image.PixelMap>): void

Obtains a video thumbnail. This API uses an asynchronous callback to return the result.

**System capability**: SystemCapability.Multimedia.Media.AVImageGenerator

**Parameters**

| Name  | Type                                        | Mandatory| Description                               |
| -------- | -------------------------------------------- | ---- | ----------------------------------- |
| timeUs | number                   | Yes  | Time of the video for which a thumbnail is to be obtained, in μs.|
| options | [AVImageQueryOptions](#avimagequeryoptions12)     | Yes  | Relationship between the time passed in and the video frame.|
| param | [PixelMapParams](#pixelmapparams12)     | Yes  | Format parameters of the thumbnail to be obtained.|
| callback | AsyncCallback\<[image.PixelMap](../apis-image-kit/js-apis-image.md#pixelmap7)>   | Yes  | Callback used to return the result. If the operation is successful, **err** is **undefined** and **data** is the **PixelMap** instance obtained; otherwise, **err** is an error object.|

**Error codes**

For details about the error codes, see [Media Error Codes](errorcode-media.md).

| ID| Error Message                                  |
| -------- | ------------------------------------------ |
| 5400102  | Operation not allowed. Returned by callback. |
| 5400106  | Unsupported format. Returned by callback.  |

**Example**

```ts
import { BusinessError } from '@kit.BasicServicesKit';
import { image } from '@kit.ImageKit';

let avImageGenerator: media.AVImageGenerator | undefined = undefined;
let pixel_map : image.PixelMap | undefined = undefined;

// Initialize input parameters.
let timeUs: number = 0

let queryOption: media.AVImageQueryOptions = media.AVImageQueryOptions.AV_IMAGE_QUERY_NEXT_SYNC

let param: media.PixelMapParams = {
  width : 300,
  height : 300,
}

// Obtain the thumbnail.
media.createAVImageGenerator((err: BusinessError, generator: media.AVImageGenerator) => {
  if(generator != null){
    avImageGenerator = generator;
    console.info(`Succeeded in creating AVImageGenerator`);
    avImageGenerator.fetchFrameByTime(timeUs, queryOption, param, (error: BusinessError, pixelMap) => {
      if (error) {
        console.error(`Failed to fetch FrameByTime, err = ${JSON.stringify(error)}`)
        return
      }
      pixel_map = pixelMap;
    });
  } else {
    console.error(`Failed to creat AVImageGenerator, error message:${err.message}`);
  };
});
```

### fetchFrameByTime<sup>12+</sup>

fetchFrameByTime(timeUs: number, options: AVImageQueryOptions, param: PixelMapParams): Promise<image.PixelMap>

Obtains a video thumbnail. This API uses a promise to return the result.

**System capability**: SystemCapability.Multimedia.Media.AVImageGenerator

**Parameters**

| Name  | Type                                        | Mandatory| Description                               |
| -------- | -------------------------------------------- | ---- | ----------------------------------- |
| timeUs | number                   | Yes  | Time of the video for which a thumbnail is to be obtained, in μs.|
| options | [AVImageQueryOptions](#avimagequeryoptions12)     | Yes  | Relationship between the time passed in and the video frame.|
| param | [PixelMapParams](#pixelmapparams12)    | Yes  | Format parameters of the thumbnail to be obtained.|

**Return value**

| Type          | Description                                    |
| -------------- | ---------------------------------------- |
| Promise\<[image.PixelMap](../apis-image-kit/js-apis-image.md#pixelmap7)> | Promise used to return the video thumbnail.|

**Error codes**

For details about the error codes, see [Media Error Codes](errorcode-media.md).

| ID| Error Message                                 |
| -------- | ----------------------------------------- |
| 5400102  | Operation not allowed. Returned by promise. |
| 5400106  | Unsupported format. Returned by promise.  |

**Example**

```ts
import { BusinessError } from '@kit.BasicServicesKit';
import { image } from '@kit.ImageKit';

let avImageGenerator: media.AVImageGenerator | undefined = undefined;
let pixel_map : image.PixelMap | undefined = undefined;

// Initialize input parameters.
let timeUs: number = 0

let queryOption: media.AVImageQueryOptions = media.AVImageQueryOptions.AV_IMAGE_QUERY_NEXT_SYNC

let param: media.PixelMapParams = {
  width : 300,
  height : 300,
}

// Obtain the thumbnail.
media.createAVImageGenerator((err: BusinessError, generator: media.AVImageGenerator) => {
  if(generator != null){
    avImageGenerator = generator;
    console.info(`Succeeded in creating AVImageGenerator`);
    avImageGenerator.fetchFrameByTime(timeUs, queryOption, param).then((pixelMap: image.PixelMap) => {
      pixel_map = pixelMap;
    }).catch((error: BusinessError) => {
      console.error(`Failed to fetch FrameByTime, error message:${error.message}`);
    });
  } else {
    console.error(`Failed to creat AVImageGenerator, error message:${err.message}`);
  };
});
```

### release<sup>12+</sup>

release(callback: AsyncCallback\<void>): void

Releases this **AVMetadataExtractor** instance. This API uses an asynchronous callback to return the result.

**System capability**: SystemCapability.Multimedia.Media.AVImageGenerator

**Parameters**

| Name  | Type                                        | Mandatory| Description                               |
| -------- | -------------------------------------------- | ---- | ----------------------------------- |
| callback | AsyncCallback\<void>                   | Yes  | Callback used to return the result. If the operation is successful, **err** is **undefined**; otherwise, **err** is an error object.|

**Error codes**

For details about the error codes, see [Media Error Codes](errorcode-media.md).

| ID| Error Message                                  |
| -------- | ------------------------------------------ |
| 5400102  | Operation not allowed. Returned by callback. |

**Example**

```ts
import { BusinessError } from '@kit.BasicServicesKit';

let avImageGenerator: media.AVImageGenerator | undefined = undefined;

// Release the instance.
media.createAVImageGenerator((err: BusinessError, generator: media.AVImageGenerator) => {
  if(generator != null){
    avImageGenerator = generator;
    console.info(`Succeeded in creating AVImageGenerator`);
    avImageGenerator.release((error: BusinessError) => {
      if (error) {
        console.error(`Failed to release, err = ${JSON.stringify(error)}`);
        return;
      }
      console.info(`Succeeded in releasing`);
    });
  } else {
    console.error(`Failed to creat AVImageGenerator, error message:${err.message}`);
  };
});
```

### release<sup>12+</sup>

release(): Promise\<void>

Releases this **AVMetadataExtractor** instance. This API uses a promise to return the result.

**System capability**: SystemCapability.Multimedia.Media.AVImageGenerator

**Return value**

| Type          | Description                                    |
| -------------- | ---------------------------------------- |
| Promise\<void> | Promise that returns no value.|

**Error codes**

For details about the error codes, see [Media Error Codes](errorcode-media.md).

| ID| Error Message                                 |
| -------- | ----------------------------------------- |
| 5400102  | Operation not allowed. Returned by promise. |

**Example**

```ts
import { BusinessError } from '@kit.BasicServicesKit';

let avImageGenerator: media.AVImageGenerator | undefined = undefined;

// Release the instance.
media.createAVImageGenerator((err: BusinessError, generator: media.AVImageGenerator) => {
  if(generator != null){
    avImageGenerator = generator;
    console.info(`Succeeded in creating AVImageGenerator`);
    avImageGenerator.release().then(() => {
      console.info(`Succeeded in releasing.`);
    }).catch((error: BusinessError) => {
      console.error(`Failed to release, error message:${error.message}`);
    });
  } else {
    console.error(`Failed to creat AVImageGenerator, error message:${err.message}`);
  };
});
```

## AVImageQueryOptions<sup>12+</sup>

Enumerates the relationship between the video frame and the time at which the video thumbnail is obtained.

The time passed in for obtaining the thumbnail may be different from the time of the video frame for which the thumbnail is actually obtained. Therefore, you need to specify their relationship.

**System capability**: SystemCapability.Multimedia.Media.AVImageGenerator

| Name                    | Value             | Description                                                        |
| ------------------------ | --------------- | ------------------------------------------------------------ |
| AV_IMAGE_QUERY_NEXT_SYNC       | 0   | The key frame at or next to the specified time is selected.                      |
| AV_IMAGE_QUERY_PREVIOUS_SYNC        | 1    | The key frame at or prior to the specified time is selected.|
| AV_IMAGE_QUERY_CLOSEST_SYNC        | 2    | The key frame closest to the specified time is selected.                |
| AV_IMAGE_QUERY_CLOSEST             | 3    | The frame (not necessarily a key frame) closest to the specified time is selected.|

## PixelMapParams<sup>12+</sup>

Defines the format parameters of the video thumbnail to be obtained.

**System capability**: SystemCapability.Multimedia.Media.AVImageGenerator

| Name  | Type  | Readable| Writable| Description                                                                           |
|--------|--------|------|------|---------------------------------------------------------------------------------|
| width  | number | Yes  | Yes  | Width of the thumbnail. The value must be greater than 0 and less than or equal to the width of the original video. Otherwise, the returned thumbnail will not be scaled.|
| height | number | Yes  | Yes  | Height of the thumbnail. The value must be greater than 0 and less than or equal to the height of the original video. Otherwise, the returned thumbnail will not be scaled.|

## media.createMediaSourceWithUrl<sup>12+</sup>

createMediaSourceWithUrl(url: string, headers?: Record\<string, string>): MediaSource

Creates a media source for streaming media to be pre-downloaded.

**Atomic service API**: This API can be used in atomic services since API version 13.

**System capability**: SystemCapability.Multimedia.Media.Core

**Parameters**

| Name  | Type    | Mandatory| Description                |
| -------- | -------- | ---- | -------------------- |
| url | string | Yes  | - URL of the media source. The following streaming media formats are supported: HLS, HTTP-FLV, DASH, and HTTPS.<br> - FD path of the local M3U8 file. |
| headers | Record\<string, string> | No  | HTTP header customized for streaming media pre-download.|

**Return value**

| Type          | Description                                      |
| -------------- | ------------------------------------------ |
| [MediaSource](#mediasource12) | **MediaSource** instance.|

**Error codes**

For details about the error codes, see [Media Error Codes](errorcode-media.md).

| ID| Error Message                                 |
| -------- | ----------------------------------------- |
| 401      | Parameter error. Possible causes: 1. Mandatory parameters are left unspecified. 2. Incorrect parameter types. 3.Parameter verification failed.      |
| 5400101  | No memory.  |

**Example 1**

```ts
let headers: Record<string, string> = {"User-Agent" : "User-Agent-Value"};
let mediaSource : media.MediaSource = media.createMediaSourceWithUrl("http://xxx",  headers);
```

**Example 2**

```ts
import { common } from '@kit.AbilityKit';
import { resourceManager } from '@kit.LocalizationKit';

let context = getContext(this) as common.UIAbilityContext;
let mgr = context.resourceManager;
let fileDescriptor = await mgr.getRawFd("xxx.m3u8");

let fd:string = fileDescriptor.fd.toString();
let offset:string = fileDescriptor.offset.toString();
let length:string = fileDescriptor.length.toString();
let fdUrl:string = "fd://" + fd + "?offset=" + offset + "&size=" + length;

let headers: Record<string, string> = {"User-Agent" : "User-Agent-Value"};
let mediaSource : media.MediaSource = media.createMediaSourceWithUrl(fdUrl,  headers);

let mimeType : media.AVMimeTypes = media.AVMimeTypes.APPLICATION_M3U8;
mediaSource.setMimeType(mimeType);

```

## MediaSource<sup>12+</sup>

Defines the media data information, which is from [createMediaSourceWithUrl](#mediacreatemediasourcewithurl12).

**System capability**: SystemCapability.Multimedia.Media.Core

### setMimeType<sup>12+</sup>

setMimeType(mimeType: AVMimeTypes): void

Sets the MIME type to help the player process extended media sources.

**Atomic service API**: This API can be used in atomic services since API version 12.

**System capability**: SystemCapability.Multimedia.Media.Core

**Parameters**

| Name  | Type    | Mandatory| Description                |
| -------- | -------- | ---- | -------------------- |
| mimeType | [AVMimeTypes](#mediasource12) | Yes  | MIME type.|

## AVMimeTypes<sup>12+</sup>

Enumerates the MIME type, which is set by using [setMimeType](#setmimetype12).

**Atomic service API**: This API can be used in atomic services since API version 12.

**System capability**: SystemCapability.Multimedia.Media.Core


| Name      | Value  | Description                                                        |
| ---------- | ---- | ------------------------------------------------------------ |
| APPLICATION_M3U8       | application/m3u8    | Local M3U8 file.|


## PlaybackStrategy<sup>12+</sup>

Describes the playback strategy.

**System capability**: SystemCapability.Multimedia.Media.Core

| Name | Type    | Mandatory| Description                |
| -------- | -------- | ---- | -------------------- |
| preferredWidth| number | No  | Preferred width, which is of the int type, for example, **1080**.<br>**Atomic service API**: This API can be used in atomic services since API version 12.|
| preferredHeight | number | No  | Preferred height, which is of the int type, for example, **1920**.<br>**Atomic service API**: This API can be used in atomic services since API version 12.|
| preferredBufferDuration | number | No | Preferred buffer duration, in seconds. The value ranges from 1 to 20.<br>**Atomic service API**: This API can be used in atomic services since API version 12.|
| preferredHdr | boolean | No  | Whether HDR is preferred. The value **true** means that HDR is preferred, and **false** means the opposite.<br>**Atomic service API**: This API can be used in atomic services since API version 12.|
| mutedMediaType | [MediaType](#mediatype8) | No| Media type for muted playback. Only **MediaType.MEDIA_TYPE_AUD** can be set.|
| preferredAudioLanguage<sup>13+</sup> | string | No| Preferred audio track language. Set this parameter based on service requirements in DASH scenarios. In non-DASH scenarios, this parameter is not supported, and you are advised to retain the default value.<br>**Atomic service API**: This API can be used in atomic services since API version 13.|
| preferredSubtitleLanguage<sup>13+</sup> | string | No| Preferred subtitle language. Set this parameter based on service requirements in DASH scenarios. In non-DASH scenarios, this parameter is not supported, and you are advised to retain the default value.<br>**Atomic service API**: This API can be used in atomic services since API version 13.|

## AVScreenCaptureRecordPreset<sup>12+</sup>

Enumerates the encoding and container formats used during screen capture.

**System capability**: SystemCapability.Multimedia.Media.AVScreenCapture

| Name                             | Value  | Description                                        |
| --------------------------------- | ---- | -------------------------------------------- |
| SCREEN_RECORD_PRESET_H264_AAC_MP4 | 0    | The H.264 video encoding format, AAC audio encoding format, and MP4 container format are used.|
| SCREEN_RECORD_PRESET_H265_AAC_MP4 | 1    | The H.265 video encoding format, AAC audio encoding format, and MP4 container format are used.|

## AVScreenCaptureStateCode<sup>12+</sup>

Enumerates the screen capture states used in callbacks.

**System capability**: SystemCapability.Multimedia.Media.AVScreenCapture

| Name                                    | Value  | Description                    |
| ---------------------------------------- | ---- | ------------------------ |
| SCREENCAPTURE_STATE_STARTED              | 0    | Screen capture is started.            |
| SCREENCAPTURE_STATE_CANCELED             | 1    | Screen capture is canceled.            |
| SCREENCAPTURE_STATE_STOPPED_BY_USER      | 2    | Screen capture is manually stopped by the user.    |
| SCREENCAPTURE_STATE_INTERRUPTED_BY_OTHER | 3    | Screen capture is interrupted by another screen capture.    |
| SCREENCAPTURE_STATE_STOPPED_BY_CALL      | 4    | Screen capture is interrupted by an incoming call.        |
| SCREENCAPTURE_STATE_MIC_UNAVAILABLE      | 5    | The microphone is unavailable during screen capture.|
| SCREENCAPTURE_STATE_MIC_MUTED_BY_USER    | 6    | The microphone is muted by the user.      |
| SCREENCAPTURE_STATE_MIC_UNMUTED_BY_USER  | 7    | The microphone is unmuted by the user.      |
| SCREENCAPTURE_STATE_ENTER_PRIVATE_SCENE  | 8    | The system enters a privacy page during screen capture.      |
| SCREENCAPTURE_STATE_EXIT_PRIVATE_SCENE   | 9    | The system exits a privacy page during screen capture.      |
| SCREENCAPTURE_STATE_STOPPED_BY_USER_SWITCHES   | 10    | Screen capture is interrupted by system user switchover.      |

## AVScreenCaptureRecordConfig<sup>12+</sup>

Defines the screen capture parameters.

**System capability**: SystemCapability.Multimedia.Media.AVScreenCapture

| Name             | Type                                                        | Mandatory| Description                                                        |
| ----------------- | ------------------------------------------------------------ | ---- | ------------------------------------------------------------ |
| fd                | number                                                       | Yes  | FD of the file output.                                          |
| frameWidth        | number                                                       | No  | Video width, in px. The default value varies according to the display in use.|
| frameHeight       | number                                                       | No  | Video height, in px. The default value varies according to the display in use.|
| videoBitrate      | number                                                       | No  | Video bit rate. The default value is **10000000**.                            |
| audioSampleRate   | number                                                       | No  | Audio sampling rate. This value is used for both internal capture and external capture (using microphones). Only **48000** (default value) and **16000** are supported.|
| audioChannelCount | number                                                       | No  | Number of audio channels. This value is used for both internal capture and external capture (using microphones). Only **1** and **2** (default) are supported.|
| audioBitrate      | number                                                       | No  | Audio bit rate. This value is used for both internal capture and external capture (using microphones). The default value is **96000**.|
| preset            | [AVScreenCaptureRecordPreset](#avscreencapturerecordpreset12) | No  | Encoding and container format used. The default value is **SCREEN_RECORD_PRESET_H264_AAC_MP4**.|

## AVScreenCaptureRecorder<sup>12+</sup>

Provides APIs to manage screen capture. Before calling any API in **AVScreenCaptureRecorder**, you must use [createAVScreenCaptureRecorder()](#mediacreateavscreencapturerecorder12) to create an **AVScreenCaptureRecorder** instance.

### init<sup>12+</sup>

init(config: AVScreenCaptureRecordConfig): Promise\<void>

Initializes screen capture and sets screen capture parameters. This API uses a promise to return the result.

**System capability**: SystemCapability.Multimedia.Media.AVScreenCapture

**Parameters**

| Name| Type                                                        | Mandatory| Description                    |
| ------ | ------------------------------------------------------------ | ---- | ------------------------ |
| config | [AVScreenCaptureRecordConfig](#avscreencapturerecordconfig12) | Yes  | Screen capture parameters to set.|

**Return value**

| Type          | Description                               |
| -------------- | ----------------------------------- |
| Promise\<void> | Promise that returns no value.|

**Error codes**

| ID| Error Message                                      |
| -------- | ---------------------------------------------- |
| 401      | Parameter error. Possible causes: 1.Mandatory parameters are left unspecified. 2.Incorrect parameter types. 3.Parameter verification failed. Return by promise. |
| 5400103  | IO error. Return by promise.                   |
| 5400105  | Service died. Return by promise.               |

**Example**

```ts
import { BusinessError } from '@kit.BasicServicesKit';

let avCaptureConfig: media.AVScreenCaptureRecordConfig = {
    fd: 0, // Before passing in an FD to this parameter, the file must be created by the caller and granted with the write permissions.
    frameWidth: 640,
    frameHeight: 480
    // Add other parameters.
}

avScreenCaptureRecorder.init(avCaptureConfig).then(() => {
    console.info('Succeeded in initing avScreenCaptureRecorder');
}).catch((err: BusinessError) => {
    console.info('Failed to init avScreenCaptureRecorder, error: ' + err.message);
})
```

### startRecording<sup>12+</sup>

startRecording(): Promise\<void>

Starts screen capture. This API uses a promise to return the result.

**System capability**: SystemCapability.Multimedia.Media.AVScreenCapture

**Return value**

| Type          | Description                            |
| -------------- | -------------------------------- |
| Promise\<void> | Promise that returns no value.|

**Error codes**

| ID| Error Message                        |
| -------- | -------------------------------- |
| 5400103  | IO error. Return by promise.     |
| 5400105  | Service died. Return by promise. |

**Example**

```ts
import { BusinessError } from '@kit.BasicServicesKit';

avScreenCaptureRecorder.startRecording().then(() => {
    console.info('Succeeded in starting avScreenCaptureRecorder');
}).catch((err: BusinessError) => {
    console.info('Failed to start avScreenCaptureRecorder, error: ' + err.message);
})
```

### stopRecording<sup>12+</sup>

stopRecording(): Promise\<void>

Stops screen capture. This API uses a promise to return the result.

**System capability**: SystemCapability.Multimedia.Media.AVScreenCapture

**Return value**

| Type          | Description                             |
| -------------- | --------------------------------- |
| Promise\<void> | Promise that returns no value.|

**Error codes**

| ID| Error Message                        |
| -------- | -------------------------------- |
| 5400103  | IO error. Return by promise.     |
| 5400105  | Service died. Return by promise. |

**Example**

```ts
import { BusinessError } from '@kit.BasicServicesKit';

avScreenCaptureRecorder.stopRecording().then(() => {
    console.info('Succeeded in stopping avScreenCaptureRecorder');
}).catch((err: BusinessError) => {
    console.info('Failed to stop avScreenCaptureRecorder, error: ' + err.message);
})
```

### skipPrivacyMode<sup>12+</sup>

skipPrivacyMode(windowIDs: Array\<number>): Promise\<void>

During screen capture, the application can exempt its privacy windows from security purposes. This API uses a promise to return the result.
For example, if a user enters a password in this application during screen capture, the application will not display a black screen.

**System capability**: SystemCapability.Multimedia.Media.AVScreenCapture

**Parameters**

| Name| Type   | Mandatory| Description                                                     |
| ------ | ------- | ---- | --------------------------------------------------------- |
| windowIDs | Array\<number> | Yes  | IDs of windows that require privacy exemption, including the main window IDs and subwindow IDs. For details about how to obtain window properties, see [Window API Reference](../apis-arkui/js-apis-window.md#getwindowproperties9).|

**Return value**

| Type          | Description                            |
| -------------- | -------------------------------- |
| Promise\<void> | Promise used to return the window IDs.|

**Error codes**

| ID| Error Message                        |
| -------- | -------------------------------- |
| 5400103  | IO error. Return by promise.     |
| 5400105  | Service died. Return by promise. |

**Example**

```ts
import { BusinessError } from '@kit.BasicServicesKit';

let windowIDs = [];
avScreenCaptureRecorder.skipPrivacyMode(windowIDs).then(() => {
    console.info('Succeeded in skipping privacy mode');
}).catch((err: BusinessError) => {
    console.info('Failed to skip privacy mode, error: ' + err.message);
})
```

### setMicEnabled<sup>12+</sup>

setMicEnabled(enable: boolean): Promise\<void>

Enables or disables the microphone. This API uses a promise to return the result.

**System capability**: SystemCapability.Multimedia.Media.AVScreenCapture

**Parameters**

| Name| Type   | Mandatory| Description                                                     |
| ------ | ------- | ---- | --------------------------------------------------------- |
| enable | boolean | Yes  | Whether to enable or disable the microphone. The value **true** means to enable the microphone, and **false** means the opposite.|

**Return value**

| Type          | Description                                   |
| -------------- | --------------------------------------- |
| Promise\<void> | Promise that returns no value.|

**Error codes**

| ID| Error Message                        |
| -------- | -------------------------------- |
| 5400103  | IO error. Return by promise.     |
| 5400105  | Service died. Return by promise. |

**Example**

```ts
import { BusinessError } from '@kit.BasicServicesKit';

avScreenCaptureRecorder.setMicEnabled(true).then(() => {
    console.info('Succeeded in setMicEnabled avScreenCaptureRecorder');
}).catch((err: BusinessError) => {
    console.info('Failed to setMicEnabled avScreenCaptureRecorder, error: ' + err.message);
})
```

### release<sup>12+</sup>

release(): Promise\<void>

Releases this **AVScreenCaptureRecorder** instance. This API uses a promise to return the result.

**System capability**: SystemCapability.Multimedia.Media.AVScreenCapture

**Return value**

| Type          | Description                             |
| -------------- | --------------------------------- |
| Promise\<void> | Promise that returns no value.|

**Error codes**

| ID| Error Message                        |
| -------- | -------------------------------- |
| 5400103  | IO error. Return by promise.     |
| 5400105  | Service died. Return by promise. |

**Example**

```ts
import { BusinessError } from '@kit.BasicServicesKit';

avScreenCaptureRecorder.release().then(() => {
    console.info('Succeeded in releasing avScreenCaptureRecorder');
}).catch((err: BusinessError) => {
    console.info('Faile to release avScreenCaptureRecorder, error: ' + err.message);
})
```

### on('stateChange')<sup>12+</sup>

on(type: 'stateChange', callback: Callback\<AVScreenCaptureStateCode>): void

Subscribes to screen capture state changes. An application can subscribe to only one screen capture state change event. When the application initiates multiple subscriptions to this event, the last subscription prevails.

**System capability**: SystemCapability.Multimedia.Media.AVScreenCapture

**Parameters**

| Name  | Type    | Mandatory| Description                                                        |
| -------- | -------- | ---- | ------------------------------------------------------------ |
| type     | string   | Yes  | Event type, which is **'stateChange'** in this case.           |
| callback | function | Yes  | Callback invoked when the event is triggered. [AVScreenCaptureStateCode](#avscreencapturestatecode12) indicates the new state.|

**Example**

```ts
avScreenCaptureRecorder.on('stateChange', (state: media.AVScreenCaptureStateCode) => {
    console.info('avScreenCaptureRecorder stateChange to ' + state);
})
```

### on('error')<sup>12+</sup>

on(type: 'error', callback: ErrorCallback): void

Subscribes to AVScreenCaptureRecorder errors. You can handle the errors based on the application logic. An application can subscribe to only one AVScreenCaptureRecorder error event. When the application initiates multiple subscriptions to this event, the last subscription prevails.

**System capability**: SystemCapability.Multimedia.Media.AVScreenCapture

**Parameters**

| Name  | Type         | Mandatory| Description                                   |
| -------- | ------------- | ---- | --------------------------------------- |
| type     | string        | Yes  | Event type, which is **'error'** in this case.|
| callback | [ErrorCallback](../apis-basic-services-kit/js-apis-base.md#errorcallback) | Yes  | Callback invoked when the event is triggered.                 |

**Error codes**

| ID| Error Message                        |
| -------- | -------------------------------- |
| 201      | permission denied.     |
| 5400103  | IO error. Return by ErrorCallback. |
| 5400105  | Service died. Return by ErrorCallback. |

**Example**

```ts
avScreenCaptureRecorder.on('error', (err: BusinessError) => {
    console.error('avScreenCaptureRecorder error:' + err.message);
})
```

### off('stateChange')<sup>12+</sup>

 off(type: 'stateChange', callback?: Callback\<AVScreenCaptureStateCode>): void

Unsubscribes from screen capture state changes. You can specify a callback to cancel the specified subscription.

**System capability**: SystemCapability.Multimedia.Media.AVScreenCapture

**Parameters**

| Name  | Type    | Mandatory| Description                                                        |
| -------- | -------- | ---- | ------------------------------------------------------------ |
| type     | string   | Yes  | Event type, which is **'stateChange'** in this case.           |
| callback | function | No  | Callback used for unsubscription. [AVScreenCaptureStateCode](#avscreencapturestatecode12) indicates the new state. If this parameter is not specified, the last subscription is canceled.|

**Example**

```ts
avScreenCaptureRecorder.off('stateChange');
```

### off('error')<sup>12+</sup>

off(type: 'error', callback?: ErrorCallback): void

Unsubscribes from AVScreenCaptureRecorder errors. You can specify a callback to cancel the specified subscription.

**System capability**: SystemCapability.Multimedia.Media.AVScreenCapture

**Parameters**

| Name  | Type    | Mandatory| Description                                                      |
| -------- | -------- | ---- | ---------------------------------------------------------- |
| type     | string   | Yes  | Event type, which is **'error'** in this case.               |
| callback | [ErrorCallback](../apis-basic-services-kit/js-apis-base.md#errorcallback) | No  | Callback used for unsubscription. If this parameter is not specified, the last subscription is canceled.|

**Example**

```ts
avScreenCaptureRecorder.off('error');
```