1# 音频录制流管理 2 3对于录制音频类的应用,开发者需要关注该应用的音频流的状态以做出相应的操作,比如监听到状态为结束时,及时提示用户录制已结束。 4 5## 读取或监听应用内音频流状态变化 6 7参考[使用AudioCapturer开发音频录制功能](using-audiocapturer-for-recording.md)或[audio.createAudioCapturer](../../reference/apis-audio-kit/js-apis-audio.md#audiocreateaudiocapturer8),完成AudioCapturer的创建,然后可以通过以下两种方式查看音频流状态的变化: 8 9- 方法1:直接查看AudioCapturer的[state](../../reference/apis-audio-kit/js-apis-audio.md#属性): 10 11 ```ts 12 let audioCapturerState: audio.AudioState = audioCapturer.state; 13 console.info(`Current state is: ${audioCapturerState }`) 14 ``` 15 16- 方法2:注册stateChange监听AudioCapturer的状态变化: 17 18 ```ts 19 audioCapturer.on('stateChange', (capturerState: audio.AudioState) => { 20 console.info(`State change to: ${capturerState}`) 21 }); 22 ``` 23 24获取state后可对照[AudioState](../../reference/apis-audio-kit/js-apis-audio.md#audiostate8)来进行相应的操作,比如显示录制结束的提示等。 25 26## 读取或监听所有录制流的变化 27 28如果部分应用需要查询获取所有音频流的变化信息,可以通过AudioStreamManager读取或监听所有音频流的变化。 29 30<!--Del--> 31> **说明:** 32> 33> 对于标记为系统接口(system api)的音频流变化信息需要系统级别应用才可查看,若应用不是系统应用,将无法获取准确信息。 34<!--DelEnd--> 35 36如下为音频流管理调用关系图: 37 38 39 40在进行应用开发的过程中,开发者需要使用getStreamManager()创建一个AudioStreamManager实例,进而通过该实例管理音频流。开发者可通过调用on('audioCapturerChange')监听音频流的变化,在音频流状态变化、设备变化时获得通知,同时可通过off('audioCapturerChange')取消相关事件的监听。另外,开发者可以通过主动调用getCurrentAudioCapturerInfoArray()查询录制流的唯一ID、录制流客户端的UID、以及流状态等信息。 41 42详细API含义可参考[AudioStreamManager](../../reference/apis-audio-kit/js-apis-audio.md#audiostreammanager9)。 43 44 45## 开发步骤及注意事项 46 471. 创建AudioStreamManager实例。 48 在使用AudioStreamManager的API前,需要使用getStreamManager()创建一个AudioStreamManager实例。 49 50 ```ts 51 import { audio } from '@kit.AudioKit'; 52 import { BusinessError } from '@kit.BasicServicesKit'; 53 54 let audioManager = audio.getAudioManager(); 55 let audioStreamManager = audioManager.getStreamManager(); 56 ``` 57 582. 使用on('audioCapturerChange')监听音频录制流更改事件。 如果音频流监听应用需要在音频录制流状态变化、设备变化时获取通知,可以订阅该事件。 59 60 ```ts 61 audioStreamManager.on('audioCapturerChange', (AudioCapturerChangeInfoArray: audio.AudioCapturerChangeInfoArray) => { 62 for (let i = 0; i < AudioCapturerChangeInfoArray.length; i++) { 63 console.info(`## CapChange on is called for element ${i} ##`); 64 console.info(`StreamId for ${i} is: ${AudioCapturerChangeInfoArray[i].streamId}`); 65 console.info(`Source for ${i} is: ${AudioCapturerChangeInfoArray[i].capturerInfo.source}`); 66 console.info(`Flag ${i} is: ${AudioCapturerChangeInfoArray[i].capturerInfo.capturerFlags}`); 67 let devDescriptor: audio.AudioDeviceDescriptors = AudioCapturerChangeInfoArray[i].deviceDescriptors; 68 for (let j = 0; j < AudioCapturerChangeInfoArray[i].deviceDescriptors.length; j++) { 69 console.info(`Id: ${i} : ${AudioCapturerChangeInfoArray[i].deviceDescriptors[j].id}`); 70 console.info(`Type: ${i} : ${AudioCapturerChangeInfoArray[i].deviceDescriptors[j].deviceType}`); 71 console.info(`Role: ${i} : ${AudioCapturerChangeInfoArray[i].deviceDescriptors[j].deviceRole}`); 72 console.info(`Name: ${i} : ${AudioCapturerChangeInfoArray[i].deviceDescriptors[j].name}`); 73 console.info(`Address: ${i} : ${AudioCapturerChangeInfoArray[i].deviceDescriptors[j].address}`); 74 console.info(`SampleRates: ${i} : ${AudioCapturerChangeInfoArray[i].deviceDescriptors[j].sampleRates[0]}`); 75 console.info(`ChannelCounts ${i} : ${AudioCapturerChangeInfoArray[i].deviceDescriptors[j].channelCounts[0]}`); 76 console.info(`ChannelMask: ${i} : ${AudioCapturerChangeInfoArray[i].deviceDescriptors[j].channelMasks}`); 77 } 78 } 79 }); 80 ``` 81 823. (可选)使用off('audioCapturerChange')取消监听音频录制流变化。 83 84 ```ts 85 audioStreamManager.off('audioCapturerChange'); 86 console.info('CapturerChange Off is called'); 87 ``` 88 894. (可选)使用getCurrentAudioCapturerInfoArray()获取当前音频录制流的信息。 90 该接口可获取音频录制流唯一ID、音频录制客户端的UID、音频状态以及音频捕获器的其他信息。 91 > **说明:** 92 > 对所有音频流状态进行监听的应用需要[声明权限](../../security/AccessToken/declare-permissions.md)ohos.permission.USE_BLUETOOTH,否则无法获得实际的设备名称和设备地址信息,查询到的设备名称和设备地址(蓝牙设备的相关属性)将为空字符串。 93 94 ```ts 95 async function getCurrentAudioCapturerInfoArray(){ 96 await audioStreamManager.getCurrentAudioCapturerInfoArray().then((AudioCapturerChangeInfoArray: audio.AudioCapturerChangeInfoArray) => { 97 console.info('getCurrentAudioCapturerInfoArray Get Promise Called '); 98 if (AudioCapturerChangeInfoArray != null) { 99 for (let i = 0; i < AudioCapturerChangeInfoArray.length; i++) { 100 console.info(`StreamId for ${i} is: ${AudioCapturerChangeInfoArray[i].streamId}`); 101 console.info(`Source for ${i} is: ${AudioCapturerChangeInfoArray[i].capturerInfo.source}`); 102 console.info(`Flag ${i} is: ${AudioCapturerChangeInfoArray[i].capturerInfo.capturerFlags}`); 103 for (let j = 0; j < AudioCapturerChangeInfoArray[i].deviceDescriptors.length; j++) { 104 console.info(`Id: ${i} : ${AudioCapturerChangeInfoArray[i].deviceDescriptors[j].id}`); 105 console.info(`Type: ${i} : ${AudioCapturerChangeInfoArray[i].deviceDescriptors[j].deviceType}`); 106 console.info(`Role: ${i} : ${AudioCapturerChangeInfoArray[i].deviceDescriptors[j].deviceRole}`); 107 console.info(`Name: ${i} : ${AudioCapturerChangeInfoArray[i].deviceDescriptors[j].name}`); 108 console.info(`Address: ${i} : ${AudioCapturerChangeInfoArray[i].deviceDescriptors[j].address}`); 109 console.info(`SampleRates: ${i} : ${AudioCapturerChangeInfoArray[i].deviceDescriptors[j].sampleRates[0]}`); 110 console.info(`ChannelCounts ${i} : ${AudioCapturerChangeInfoArray[i].deviceDescriptors[j].channelCounts[0]}`); 111 console.info(`ChannelMask: ${i} : ${AudioCapturerChangeInfoArray[i].deviceDescriptors[j].channelMasks}`); 112 } 113 } 114 } 115 }).catch((err: BusinessError) => { 116 console.error(`Invoke getCurrentAudioCapturerInfoArray failed, code is ${err.code}, message is ${err.message}`); 117 }); 118 } 119 ``` 120