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