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| 1 // Copyright 2014 The Chromium Authors. All rights reserved. |
| 2 // Use of this source code is governed by a BSD-style license that can be |
| 3 // found in the LICENSE file. |
| 4 |
| 5 #ifndef CONTENT_RENDERER_MEDIA_MEDIA_STREAM_AUDIO_LEVEL_CALCULATOR_H_ |
| 6 #define CONTENT_RENDERER_MEDIA_MEDIA_STREAM_AUDIO_LEVEL_CALCULATOR_H_ |
| 7 |
| 8 #include "base/threading/thread_checker.h" |
| 9 |
| 10 namespace content { |
| 11 |
| 12 // This class is used by the WebRtcLocalAudioTrack to calculate the level of |
| 13 // the audio signal. And the audio level will be eventually used by the volume |
| 14 // animation UI. |
| 15 // The algorithm used by this class is the same as how it is done in |
| 16 // third_party/webrtc/voice_engine/level_indicator.cc. |
| 17 class MediaStreamAudioLevelCalculator { |
| 18 public: |
| 19 MediaStreamAudioLevelCalculator(); |
| 20 ~MediaStreamAudioLevelCalculator(); |
| 21 |
| 22 // Calculates the signal level of the audio data. |
| 23 // Returns the level of bars that the volume animation UI uses for |
| 24 // presenting the energy level of the audio data. |
| 25 int Calculate(const int16* audio_data, int number_of_channels, |
| 26 int number_of_frames); |
| 27 |
| 28 private: |
| 29 // Used to DCHECK that some methods are called on the same thread. |
| 30 base::ThreadChecker thread_checker_; |
| 31 |
| 32 int counter_; |
| 33 int max_amplitude_; |
| 34 int level_; |
| 35 }; |
| 36 |
| 37 } // namespace content |
| 38 |
| 39 #endif // CONTENT_RENDERER_MEDIA_MEDIA_STREAM_AUDIO_LEVEL_CALCULATOR_H_ |
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