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7ddd46386a
This CL balances the NLP tradeoff in AEC3 to properly handle the cases when the echo path is so strong that it saturates the echo and when it is so weak that the echo is very low compared to nearend. Bug: webrtc:8411, webrtc:8412, chromium:775653 Change-Id: I5aff74dfadd51cac1ce71b1cb935d68a5be6918d Reviewed-on: https://webrtc-review.googlesource.com/14120 Commit-Queue: Per Åhgren <peah@webrtc.org> Reviewed-by: Per Åhgren <peah@webrtc.org> Reviewed-by: Gustaf Ullberg <gustaf@webrtc.org> Cr-Commit-Position: refs/heads/master@{#20418}
81 lines
2.9 KiB
C++
81 lines
2.9 KiB
C++
/*
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* Copyright (c) 2017 The WebRTC project authors. All Rights Reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#ifndef MODULES_AUDIO_PROCESSING_AEC3_SUBTRACTOR_H_
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#define MODULES_AUDIO_PROCESSING_AEC3_SUBTRACTOR_H_
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#include <array>
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#include <algorithm>
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#include <vector>
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#include "modules/audio_processing/aec3/adaptive_fir_filter.h"
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#include "modules/audio_processing/aec3/aec3_common.h"
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#include "modules/audio_processing/aec3/aec3_fft.h"
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#include "modules/audio_processing/aec3/aec_state.h"
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#include "modules/audio_processing/aec3/echo_path_variability.h"
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#include "modules/audio_processing/aec3/main_filter_update_gain.h"
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#include "modules/audio_processing/aec3/render_buffer.h"
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#include "modules/audio_processing/aec3/shadow_filter_update_gain.h"
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#include "modules/audio_processing/aec3/subtractor_output.h"
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#include "modules/audio_processing/logging/apm_data_dumper.h"
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#include "modules/audio_processing/utility/ooura_fft.h"
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#include "rtc_base/constructormagic.h"
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namespace webrtc {
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// Proves linear echo cancellation functionality
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class Subtractor {
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public:
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Subtractor(ApmDataDumper* data_dumper, Aec3Optimization optimization);
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~Subtractor();
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// Performs the echo subtraction.
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void Process(const RenderBuffer& render_buffer,
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const rtc::ArrayView<const float> capture,
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const RenderSignalAnalyzer& render_signal_analyzer,
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const AecState& aec_state,
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SubtractorOutput* output);
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void HandleEchoPathChange(const EchoPathVariability& echo_path_variability);
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// Returns the block-wise frequency response for the main adaptive filter.
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const std::vector<std::array<float, kFftLengthBy2Plus1>>&
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FilterFrequencyResponse() const {
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if (use_shadow_filter_frequency_response_) {
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return shadow_filter_.FilterFrequencyResponse();
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}
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return main_filter_.FilterFrequencyResponse();
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}
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// Returns the estimate of the impulse response for the main adaptive filter.
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const std::array<float, kAdaptiveFilterTimeDomainLength>&
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FilterImpulseResponse() const {
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return main_filter_.FilterImpulseResponse();
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}
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bool ConvergedFilter() const { return converged_filter_; }
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private:
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const Aec3Fft fft_;
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ApmDataDumper* data_dumper_;
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const Aec3Optimization optimization_;
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AdaptiveFirFilter main_filter_;
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AdaptiveFirFilter shadow_filter_;
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MainFilterUpdateGain G_main_;
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ShadowFilterUpdateGain G_shadow_;
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bool converged_filter_ = false;
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size_t converged_filter_counter_ = 0;
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bool use_shadow_filter_frequency_response_ = false;
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RTC_DISALLOW_IMPLICIT_CONSTRUCTORS(Subtractor);
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};
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} // namespace webrtc
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#endif // MODULES_AUDIO_PROCESSING_AEC3_SUBTRACTOR_H_
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