d5cb477576
This CL is created from a work initiated at https://webrtc-review.googlesource.com/c/src/+/61160 The purpose of this work is to improve the performance of the echo canceler (AEC3) when the farend signal contains stationary noises: - An stationarity estimator of the farend signal has been added for detecting the portions of the farend signal that are pure noise. - When the echo canceler deals with a portion of the signal that contains basically noise, the echo suppressor is able to back-off and avoid the fading of the nearend speech. Change-Id: Id4b87fc59f4765bf1fca36d1cab39a49aabe104a Bug: webrtc:9193,chromium:836790 Reviewed-on: https://webrtc-review.googlesource.com/64141 Reviewed-by: Per Åhgren <peah@webrtc.org> Commit-Queue: Jesus de Vicente Pena <devicentepena@webrtc.org> Cr-Commit-Position: refs/heads/master@{#23024}
51 lines
1.7 KiB
C++
51 lines
1.7 KiB
C++
/*
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* Copyright (c) 2018 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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#include "modules/audio_processing/aec3/echo_audibility.h"
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#include <algorithm>
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#include "modules/audio_processing/aec3/aec3_common.h"
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#include "modules/audio_processing/aec3/stationarity_estimator.h"
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namespace webrtc {
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EchoAudibility::EchoAudibility() {
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Reset();
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}
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void EchoAudibility::Reset() {
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render_stationarity_.Reset();
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}
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EchoAudibility::~EchoAudibility() = default;
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void EchoAudibility::Update(const RenderBuffer& render_buffer,
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size_t delay_blocks,
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size_t capture_block_counter) {
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RTC_DCHECK_GT(capture_block_counter, delay_blocks);
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size_t num_lookahead = std::min(StationarityEstimator::GetMaxNumLookAhead(),
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render_buffer.Headroom() - delay_blocks + 1);
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int render_block_number = capture_block_counter - delay_blocks;
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for (size_t k = 0; k < (num_lookahead + 1); ++k) {
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// Delay changes can potentially make that not all the farend blocks
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// are seen. That effect is assumed to have a minimum effect in the
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// estimation.
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render_stationarity_.Update(render_buffer.Spectrum(delay_blocks - k),
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render_block_number + k);
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}
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render_stationarity_.UpdateStationarityFlags(render_block_number,
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num_lookahead);
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}
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} // namespace webrtc
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