1 /* 2 * Copyright (c) 2018 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_ERLE_ESTIMATOR_H_ 12 #define MODULES_AUDIO_PROCESSING_AEC3_SUBBAND_ERLE_ESTIMATOR_H_ 13 14 #include <stddef.h> 15 16 #include <array> 17 #include <memory> 18 #include <vector> 19 20 #include "api/array_view.h" 21 #include "api/audio/echo_canceller3_config.h" 22 #include "modules/audio_processing/aec3/aec3_common.h" 23 #include "modules/audio_processing/logging/apm_data_dumper.h" 24 25 namespace webrtc { 26 27 // Estimates the echo return loss enhancement for each frequency subband. 28 class SubbandErleEstimator { 29 public: 30 SubbandErleEstimator(const EchoCanceller3Config& config, 31 size_t num_capture_channels); 32 ~SubbandErleEstimator(); 33 34 // Resets the ERLE estimator. 35 void Reset(); 36 37 // Updates the ERLE estimate. 38 void Update(rtc::ArrayView<const float, kFftLengthBy2Plus1> X2, 39 rtc::ArrayView<const std::array<float, kFftLengthBy2Plus1>> Y2, 40 rtc::ArrayView<const std::array<float, kFftLengthBy2Plus1>> E2, 41 const std::vector<bool>& converged_filters); 42 43 // Returns the ERLE estimate. Erle()44 rtc::ArrayView<const std::array<float, kFftLengthBy2Plus1>> Erle() const { 45 return erle_; 46 } 47 48 // Returns the ERLE estimate at onsets (only used for testing). ErleOnsets()49 rtc::ArrayView<const std::array<float, kFftLengthBy2Plus1>> ErleOnsets() 50 const { 51 return erle_onsets_; 52 } 53 54 void Dump(const std::unique_ptr<ApmDataDumper>& data_dumper) const; 55 56 private: 57 struct AccumulatedSpectra { AccumulatedSpectraAccumulatedSpectra58 explicit AccumulatedSpectra(size_t num_capture_channels) 59 : Y2(num_capture_channels), 60 E2(num_capture_channels), 61 low_render_energy(num_capture_channels), 62 num_points(num_capture_channels) {} 63 std::vector<std::array<float, kFftLengthBy2Plus1>> Y2; 64 std::vector<std::array<float, kFftLengthBy2Plus1>> E2; 65 std::vector<std::array<bool, kFftLengthBy2Plus1>> low_render_energy; 66 std::vector<int> num_points; 67 }; 68 69 void UpdateAccumulatedSpectra( 70 rtc::ArrayView<const float, kFftLengthBy2Plus1> X2, 71 rtc::ArrayView<const std::array<float, kFftLengthBy2Plus1>> Y2, 72 rtc::ArrayView<const std::array<float, kFftLengthBy2Plus1>> E2, 73 const std::vector<bool>& converged_filters); 74 75 void ResetAccumulatedSpectra(); 76 77 void UpdateBands(const std::vector<bool>& converged_filters); 78 void DecreaseErlePerBandForLowRenderSignals(); 79 80 const bool use_onset_detection_; 81 const float min_erle_; 82 const std::array<float, kFftLengthBy2Plus1> max_erle_; 83 const bool use_min_erle_during_onsets_; 84 AccumulatedSpectra accum_spectra_; 85 std::vector<std::array<float, kFftLengthBy2Plus1>> erle_; 86 std::vector<std::array<float, kFftLengthBy2Plus1>> erle_onsets_; 87 std::vector<std::array<bool, kFftLengthBy2Plus1>> coming_onset_; 88 std::vector<std::array<int, kFftLengthBy2Plus1>> hold_counters_; 89 }; 90 91 } // namespace webrtc 92 93 #endif // MODULES_AUDIO_PROCESSING_AEC3_SUBBAND_ERLE_ESTIMATOR_H_ 94