1 /*
2  * Copyright (c) 2023 Huawei Device Co., Ltd.
3  * Licensed under the Apache License, Version 2.0 (the "License");
4  * you may not use this file except in compliance with the License.
5  * You may obtain a copy of the License at
6  *
7  *     http://www.apache.org/licenses/LICENSE-2.0
8  *
9  * Unless required by applicable law or agreed to in writing, software
10  * distributed under the License is distributed on an "AS IS" BASIS,
11  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12  * See the License for the specific language governing permissions and
13  * limitations under the License.
14  */
15 #ifndef VOLUME_RAMP_H
16 #define VOLUME_RAMP_H
17 
18 #include <cstdint>
19 #include <string>
20 #include <map>
21 #include <mutex>
22 #include <cmath>
23 #include "audio_info.h"
24 
25 namespace OHOS {
26 namespace AudioStandard {
27 
28 enum RampDirection {
29     RAMP_UP = 0,
30     RAMP_DOWN = 1,
31 };
32 
33 class VolumeRamp {
34 public:
35     VolumeRamp();
36     ~VolumeRamp() = default;
37     void SetVolumeRampConfig(float targetVolume, float currStreamVolume, int32_t duration);
38     float GetRampVolume();
39     bool IsActive();
40     void Terminate();
41 
42 private:
43     void SetVolumeCurve(std::vector<float> &volumes);
44     float GetScaledTime(int64_t currentTime);
45     float FindRampVolume(float time);
46 
47     int32_t duration_ = 0;
48     RampDirection rampDirection_ = RAMP_UP;
49     std::mutex curveMapMutex_;
50     std::map<float, float> curvePoints_;
51     int64_t initTime_ = 0;
52     float scale_ = 0.0f;
53     bool isVolumeRampActive_ = false;
54     float rampVolume_ = 0.0f;
55 };
56 } // namespace AudioStandard
57 } // namespace OHOS
58 #endif // VOLUME_RAMP_H
59