subband_nearend_detector.h (2061B)
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 <array> 15 #include <cstddef> 16 #include <vector> 17 18 #include "api/array_view.h" 19 #include "api/audio/echo_canceller3_config.h" 20 #include "modules/audio_processing/aec3/aec3_common.h" 21 #include "modules/audio_processing/aec3/moving_average.h" 22 #include "modules/audio_processing/aec3/nearend_detector.h" 23 24 namespace webrtc { 25 // Class for selecting whether the suppressor is in the nearend or echo state. 26 class SubbandNearendDetector : public NearendDetector { 27 public: 28 SubbandNearendDetector( 29 const EchoCanceller3Config::Suppressor::SubbandNearendDetection& config, 30 size_t num_capture_channels); 31 32 // Returns whether the current state is the nearend state. 33 bool IsNearendState() const override { return nearend_state_; } 34 35 // Updates the state selection based on latest spectral estimates. 36 void Update( 37 ArrayView<const std::array<float, kFftLengthBy2Plus1>> nearend_spectrum, 38 ArrayView<const std::array<float, kFftLengthBy2Plus1>> 39 residual_echo_spectrum, 40 ArrayView<const std::array<float, kFftLengthBy2Plus1>> 41 comfort_noise_spectrum, 42 bool initial_state) override; 43 44 private: 45 const EchoCanceller3Config::Suppressor::SubbandNearendDetection config_; 46 const size_t num_capture_channels_; 47 std::vector<aec3::MovingAverage> nearend_smoothers_; 48 const float one_over_subband_length1_; 49 const float one_over_subband_length2_; 50 bool nearend_state_ = false; 51 }; 52 53 } // namespace webrtc 54 55 #endif // MODULES_AUDIO_PROCESSING_AEC3_SUBBAND_NEAREND_DETECTOR_H_