1*d9f75844SAndroid Build Coastguard Worker /* 2*d9f75844SAndroid Build Coastguard Worker * Copyright (c) 2012 The WebRTC project authors. All Rights Reserved. 3*d9f75844SAndroid Build Coastguard Worker * 4*d9f75844SAndroid Build Coastguard Worker * Use of this source code is governed by a BSD-style license 5*d9f75844SAndroid Build Coastguard Worker * that can be found in the LICENSE file in the root of the source 6*d9f75844SAndroid Build Coastguard Worker * tree. An additional intellectual property rights grant can be found 7*d9f75844SAndroid Build Coastguard Worker * in the file PATENTS. All contributing project authors may 8*d9f75844SAndroid Build Coastguard Worker * be found in the AUTHORS file in the root of the source tree. 9*d9f75844SAndroid Build Coastguard Worker */ 10*d9f75844SAndroid Build Coastguard Worker 11*d9f75844SAndroid Build Coastguard Worker #ifndef MODULES_AUDIO_PROCESSING_AGC_AGC_H_ 12*d9f75844SAndroid Build Coastguard Worker #define MODULES_AUDIO_PROCESSING_AGC_AGC_H_ 13*d9f75844SAndroid Build Coastguard Worker 14*d9f75844SAndroid Build Coastguard Worker #include <memory> 15*d9f75844SAndroid Build Coastguard Worker 16*d9f75844SAndroid Build Coastguard Worker #include "api/array_view.h" 17*d9f75844SAndroid Build Coastguard Worker #include "modules/audio_processing/vad/voice_activity_detector.h" 18*d9f75844SAndroid Build Coastguard Worker 19*d9f75844SAndroid Build Coastguard Worker namespace webrtc { 20*d9f75844SAndroid Build Coastguard Worker 21*d9f75844SAndroid Build Coastguard Worker class LoudnessHistogram; 22*d9f75844SAndroid Build Coastguard Worker 23*d9f75844SAndroid Build Coastguard Worker class Agc { 24*d9f75844SAndroid Build Coastguard Worker public: 25*d9f75844SAndroid Build Coastguard Worker Agc(); 26*d9f75844SAndroid Build Coastguard Worker virtual ~Agc(); 27*d9f75844SAndroid Build Coastguard Worker 28*d9f75844SAndroid Build Coastguard Worker // `audio` must be mono; in a multi-channel stream, provide the first (usually 29*d9f75844SAndroid Build Coastguard Worker // left) channel. 30*d9f75844SAndroid Build Coastguard Worker virtual void Process(rtc::ArrayView<const int16_t> audio); 31*d9f75844SAndroid Build Coastguard Worker 32*d9f75844SAndroid Build Coastguard Worker // Retrieves the difference between the target RMS level and the current 33*d9f75844SAndroid Build Coastguard Worker // signal RMS level in dB. Returns true if an update is available and false 34*d9f75844SAndroid Build Coastguard Worker // otherwise, in which case `error` should be ignored and no action taken. 35*d9f75844SAndroid Build Coastguard Worker virtual bool GetRmsErrorDb(int* error); 36*d9f75844SAndroid Build Coastguard Worker virtual void Reset(); 37*d9f75844SAndroid Build Coastguard Worker 38*d9f75844SAndroid Build Coastguard Worker virtual int set_target_level_dbfs(int level); 39*d9f75844SAndroid Build Coastguard Worker virtual int target_level_dbfs() const; 40*d9f75844SAndroid Build Coastguard Worker virtual float voice_probability() const; 41*d9f75844SAndroid Build Coastguard Worker 42*d9f75844SAndroid Build Coastguard Worker private: 43*d9f75844SAndroid Build Coastguard Worker double target_level_loudness_; 44*d9f75844SAndroid Build Coastguard Worker int target_level_dbfs_; 45*d9f75844SAndroid Build Coastguard Worker std::unique_ptr<LoudnessHistogram> histogram_; 46*d9f75844SAndroid Build Coastguard Worker std::unique_ptr<LoudnessHistogram> inactive_histogram_; 47*d9f75844SAndroid Build Coastguard Worker VoiceActivityDetector vad_; 48*d9f75844SAndroid Build Coastguard Worker }; 49*d9f75844SAndroid Build Coastguard Worker 50*d9f75844SAndroid Build Coastguard Worker } // namespace webrtc 51*d9f75844SAndroid Build Coastguard Worker 52*d9f75844SAndroid Build Coastguard Worker #endif // MODULES_AUDIO_PROCESSING_AGC_AGC_H_ 53