1 /* 2 * Copyright (c) 2019 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_SUBBAND_NEAREND_DETECTOR_H_ 12 #define MODULES_AUDIO_PROCESSING_AEC3_SUBBAND_NEAREND_DETECTOR_H_ 13 14 #include <vector> 15 16 #include "api/array_view.h" 17 #include "api/audio/echo_canceller3_config.h" 18 #include "modules/audio_processing/aec3/moving_average.h" 19 #include "modules/audio_processing/aec3/nearend_detector.h" 20 21 namespace webrtc { 22 // Class for selecting whether the suppressor is in the nearend or echo state. 23 class SubbandNearendDetector : public NearendDetector { 24 public: 25 SubbandNearendDetector( 26 const EchoCanceller3Config::Suppressor::SubbandNearendDetection& config, 27 size_t num_capture_channels); 28 29 // Returns whether the current state is the nearend state. IsNearendState()30 bool IsNearendState() const override { return nearend_state_; } 31 32 // Updates the state selection based on latest spectral estimates. 33 void Update(rtc::ArrayView<const std::array<float, kFftLengthBy2Plus1>> 34 nearend_spectrum, 35 rtc::ArrayView<const std::array<float, kFftLengthBy2Plus1>> 36 residual_echo_spectrum, 37 rtc::ArrayView<const std::array<float, kFftLengthBy2Plus1>> 38 comfort_noise_spectrum, 39 bool initial_state) override; 40 41 private: 42 const EchoCanceller3Config::Suppressor::SubbandNearendDetection config_; 43 const size_t num_capture_channels_; 44 std::vector<aec3::MovingAverage> nearend_smoothers_; 45 const float one_over_subband_length1_; 46 const float one_over_subband_length2_; 47 bool nearend_state_ = false; 48 }; 49 50 } // namespace webrtc 51 52 #endif // MODULES_AUDIO_PROCESSING_AEC3_SUBBAND_NEAREND_DETECTOR_H_ 53