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
