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1  /*
2   *  Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
3   *
4   *  Use of this source code is governed by a BSD-style license
5   *  that can be found in the LICENSE file in the root of the source
6   *  tree. An additional intellectual property rights grant can be found
7   *  in the file PATENTS.  All contributing project authors may
8   *  be found in the AUTHORS file in the root of the source tree.
9   */
10  
11  #ifndef WEBRTC_VOICE_ENGINE_LEVEL_INDICATOR_H
12  #define WEBRTC_VOICE_ENGINE_LEVEL_INDICATOR_H
13  
14  #include "webrtc/typedefs.h"
15  #include "webrtc/voice_engine/voice_engine_defines.h"
16  
17  namespace webrtc {
18  
19  class AudioFrame;
20  class CriticalSectionWrapper;
21  namespace voe {
22  
23  class AudioLevel
24  {
25  public:
26      AudioLevel();
27      virtual ~AudioLevel();
28  
29      // Called on "API thread(s)" from APIs like VoEBase::CreateChannel(),
30      // VoEBase::StopSend(), VoEVolumeControl::GetSpeechOutputLevel().
31      int8_t Level() const;
32      int16_t LevelFullRange() const;
33      void Clear();
34  
35      // Called on a native capture audio thread (platform dependent) from the
36      // AudioTransport::RecordedDataIsAvailable() callback.
37      // In Chrome, this method is called on the AudioInputDevice thread.
38      void ComputeLevel(const AudioFrame& audioFrame);
39  
40  private:
41      enum { kUpdateFrequency = 10};
42  
43      CriticalSectionWrapper& _critSect;
44  
45      int16_t _absMax;
46      int16_t _count;
47      int8_t _currentLevel;
48      int16_t _currentLevelFullRange;
49  };
50  
51  }  // namespace voe
52  
53  }  // namespace webrtc
54  
55  #endif // WEBRTC_VOICE_ENGINE_LEVEL_INDICATOR_H
56