ced31ba1cf
This CL corrects the usage of the estimated echo path gain to not be hardcoded to 1. In order to retain the tuned behavior, the CL for now maintains the former behavior in the code. Bug: webrtc:9255,chromium:851187 Change-Id: I7f91c72e476680a8a854c22b74b1771fae446110 Reviewed-on: https://webrtc-review.googlesource.com/75510 Reviewed-by: Gustaf Ullberg <gustaf@webrtc.org> Commit-Queue: Per Åhgren <peah@webrtc.org> Cr-Commit-Position: refs/heads/master@{#23190}
94 lines
3.6 KiB
C++
94 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_RESIDUAL_ECHO_ESTIMATOR_H_
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#define MODULES_AUDIO_PROCESSING_AEC3_RESIDUAL_ECHO_ESTIMATOR_H_
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#include <algorithm>
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#include <array>
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#include <vector>
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#include "api/array_view.h"
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#include "api/audio/echo_canceller3_config.h"
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#include "modules/audio_processing/aec3/aec3_common.h"
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#include "modules/audio_processing/aec3/aec_state.h"
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#include "modules/audio_processing/aec3/render_buffer.h"
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#include "rtc_base/constructormagic.h"
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namespace webrtc {
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class ResidualEchoEstimator {
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public:
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explicit ResidualEchoEstimator(const EchoCanceller3Config& config);
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~ResidualEchoEstimator();
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void Estimate(const AecState& aec_state,
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const RenderBuffer& render_buffer,
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const std::array<float, kFftLengthBy2Plus1>& S2_linear,
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const std::array<float, kFftLengthBy2Plus1>& Y2,
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std::array<float, kFftLengthBy2Plus1>* R2);
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private:
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// Resets the state.
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void Reset();
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// Estimates the residual echo power based on the echo return loss enhancement
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// (ERLE) and the linear power estimate.
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void LinearEstimate(const std::array<float, kFftLengthBy2Plus1>& S2_linear,
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const std::array<float, kFftLengthBy2Plus1>& erle,
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std::array<float, kFftLengthBy2Plus1>* R2);
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// Estimates the residual echo power based on the estimate of the echo path
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// gain.
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void NonLinearEstimate(float echo_path_gain,
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const std::array<float, kFftLengthBy2Plus1>& X2,
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const std::array<float, kFftLengthBy2Plus1>& Y2,
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std::array<float, kFftLengthBy2Plus1>* R2);
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// Adds the estimated unmodelled echo power to the residual echo power
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// estimate.
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void AddEchoReverb(const std::array<float, kFftLengthBy2Plus1>& S2,
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size_t delay,
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float reverb_decay_factor,
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std::array<float, kFftLengthBy2Plus1>* R2);
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// Estimates the echo generating signal power as gated maximal power over a
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// time window.
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void EchoGeneratingPower(const RenderBuffer& render_buffer,
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size_t min_delay,
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size_t max_delay,
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bool apply_noise_gating,
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std::array<float, kFftLengthBy2Plus1>* X2) const;
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// Updates estimate for the power of the stationary noise component in the
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// render signal.
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void RenderNoisePower(
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const RenderBuffer& render_buffer,
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std::array<float, kFftLengthBy2Plus1>* X2_noise_floor,
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std::array<int, kFftLengthBy2Plus1>* X2_noise_floor_counter) const;
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const EchoCanceller3Config config_;
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std::array<float, kFftLengthBy2Plus1> R2_old_;
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std::array<int, kFftLengthBy2Plus1> R2_hold_counter_;
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std::array<float, kFftLengthBy2Plus1> R2_reverb_;
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int S2_old_index_ = 0;
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std::vector<std::array<float, kFftLengthBy2Plus1>> S2_old_;
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std::array<float, kFftLengthBy2Plus1> X2_noise_floor_;
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std::array<int, kFftLengthBy2Plus1> X2_noise_floor_counter_;
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const bool soft_transparent_mode_;
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const bool override_estimated_echo_path_gain_;
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RTC_DISALLOW_IMPLICIT_CONSTRUCTORS(ResidualEchoEstimator);
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};
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} // namespace webrtc
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#endif // MODULES_AUDIO_PROCESSING_AEC3_RESIDUAL_ECHO_ESTIMATOR_H_
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