1 /* 2 * Copyright (c) 2012 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 MODULES_AUDIO_PROCESSING_AGC_AGC_H_ 12 #define MODULES_AUDIO_PROCESSING_AGC_AGC_H_ 13 14 #include <memory> 15 16 #include "modules/audio_processing/vad/voice_activity_detector.h" 17 18 namespace webrtc { 19 20 class LoudnessHistogram; 21 22 class Agc { 23 public: 24 Agc(); 25 virtual ~Agc(); 26 27 // |audio| must be mono; in a multi-channel stream, provide the first (usually 28 // left) channel. 29 virtual void Process(const int16_t* audio, size_t length, int sample_rate_hz); 30 31 // Retrieves the difference between the target RMS level and the current 32 // signal RMS level in dB. Returns true if an update is available and false 33 // otherwise, in which case |error| should be ignored and no action taken. 34 virtual bool GetRmsErrorDb(int* error); 35 virtual void Reset(); 36 37 virtual int set_target_level_dbfs(int level); 38 virtual int target_level_dbfs() const; 39 virtual float voice_probability() const; 40 41 private: 42 double target_level_loudness_; 43 int target_level_dbfs_; 44 std::unique_ptr<LoudnessHistogram> histogram_; 45 std::unique_ptr<LoudnessHistogram> inactive_histogram_; 46 VoiceActivityDetector vad_; 47 }; 48 49 } // namespace webrtc 50 51 #endif // MODULES_AUDIO_PROCESSING_AGC_AGC_H_ 52