1 /* 2 * Copyright (c) 2017 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_AEC3_SHADOW_FILTER_UPDATE_GAIN_H_ 12 #define MODULES_AUDIO_PROCESSING_AEC3_SHADOW_FILTER_UPDATE_GAIN_H_ 13 14 #include "modules/audio_processing/aec3/aec3_common.h" 15 #include "modules/audio_processing/aec3/render_buffer.h" 16 #include "modules/audio_processing/aec3/render_signal_analyzer.h" 17 #include "rtc_base/constructormagic.h" 18 19 namespace webrtc { 20 21 // Provides functionality for computing the fixed gain for the shadow filter. 22 class ShadowFilterUpdateGain { 23 public: 24 // Takes action in the case of a known echo path change. 25 void HandleEchoPathChange(); 26 27 // Computes the gain. 28 void Compute(const RenderBuffer& render_buffer, 29 const RenderSignalAnalyzer& render_signal_analyzer, 30 const FftData& E_shadow, 31 size_t size_partitions, 32 bool saturated_capture_signal, 33 FftData* G); 34 35 private: 36 // TODO(peah): Check whether this counter should instead be initialized to a 37 // large value. 38 size_t poor_signal_excitation_counter_ = 0; 39 size_t call_counter_ = 0; 40 }; 41 42 } // namespace webrtc 43 44 #endif // MODULES_AUDIO_PROCESSING_AEC3_SHADOW_FILTER_UPDATE_GAIN_H_ 45