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fc63c9e273
This CL removes the constraint that freezes the filter adaptation whenever the estimated echo or the prediction error is saturated. This allows for much more rapid filter recovery in cases where the echo path gain for some reason changes, such as when the analog AGC gain is adjusted or the loudspeaker volume is changed. TBR: devicentepena@webrtc.org Bug: webrtc:9466,chromium:857426 Change-Id: Ic0b3b03f41f12e9a607aaadd2ee91cbaa16cac52 Reviewed-on: https://webrtc-review.googlesource.com/86124 Commit-Queue: Per Åhgren <peah@webrtc.org> Reviewed-by: Gustaf Ullberg <gustaf@webrtc.org> Cr-Commit-Position: refs/heads/master@{#23775}
99 lines
3.6 KiB
C++
99 lines
3.6 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 <algorithm>
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#include <array>
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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(const EchoCanceller3Config& config,
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ApmDataDumper* data_dumper,
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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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// Exits the initial state.
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void ExitInitialState();
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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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return main_filter_once_converged_ || (!shadow_filter_converged_)
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? main_filter_.FilterFrequencyResponse()
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: shadow_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::vector<float>& FilterImpulseResponse() const {
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return main_filter_once_converged_ || (!shadow_filter_converged_)
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? main_filter_.FilterImpulseResponse()
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: shadow_filter_.FilterImpulseResponse();
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}
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bool ConvergedFilter() const {
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return main_filter_converged_ || shadow_filter_converged_;
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}
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bool DivergedFilter() const { return main_filter_diverged_; }
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void DumpFilters() {
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main_filter_.DumpFilter("aec3_subtractor_H_main", "aec3_subtractor_h_main");
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shadow_filter_.DumpFilter("aec3_subtractor_H_shadow",
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"aec3_subtractor_h_shadow");
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}
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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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const EchoCanceller3Config config_;
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const bool adaptation_during_saturation_;
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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 main_filter_converged_ = false;
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bool main_filter_once_converged_ = false;
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bool shadow_filter_converged_ = false;
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bool main_filter_diverged_ = 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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