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
17namespace webrtc {
18
19class AudioFrame;
20class CriticalSectionWrapper;
21namespace voe {
22
23class AudioLevel
24{
25public:
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
40private:
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