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/*
* Copyright (c) 2017 The WebRTC project authors. All Rights Reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
#ifndef MODULES_AUDIO_PROCESSING_AEC3_RESIDUAL_ECHO_ESTIMATOR_H_
#define MODULES_AUDIO_PROCESSING_AEC3_RESIDUAL_ECHO_ESTIMATOR_H_
#include <algorithm>
#include <array>
#include <memory>
#include <vector>
#include "api/array_view.h"
#include "api/audio/echo_canceller3_config.h"
#include "modules/audio_processing/aec3/aec3_common.h"
#include "modules/audio_processing/aec3/aec_state.h"
#include "modules/audio_processing/aec3/render_buffer.h"
#include "modules/audio_processing/aec3/reverb_model.h"
#include "modules/audio_processing/aec3/reverb_model_fallback.h"
#include "rtc_base/constructormagic.h"
namespace webrtc {
class ResidualEchoEstimator {
public:
explicit ResidualEchoEstimator(const EchoCanceller3Config& config);
~ResidualEchoEstimator();
void Estimate(const AecState& aec_state,
const RenderBuffer& render_buffer,
const std::array<float, kFftLengthBy2Plus1>& S2_linear,
const std::array<float, kFftLengthBy2Plus1>& Y2,
std::array<float, kFftLengthBy2Plus1>* R2);
// Returns the reverberant power spectrum contributions to the echo residual.
const std::array<float, kFftLengthBy2Plus1>& GetReverbPowerSpectrum() const {
if (echo_reverb_) {
return echo_reverb_->GetPowerSpectrum();
} else {
RTC_DCHECK(echo_reverb_fallback);
return echo_reverb_fallback->GetPowerSpectrum();
}
}
private:
// Resets the state.
void Reset();
// Estimates the residual echo power based on the echo return loss enhancement
// (ERLE) and the linear power estimate.
void LinearEstimate(const std::array<float, kFftLengthBy2Plus1>& S2_linear,
const std::array<float, kFftLengthBy2Plus1>& erle,
absl::optional<float> erle_uncertainty,
std::array<float, kFftLengthBy2Plus1>* R2);
// Estimates the residual echo power based on the estimate of the echo path
// gain.
void NonLinearEstimate(float echo_path_gain,
const std::array<float, kFftLengthBy2Plus1>& X2,
const std::array<float, kFftLengthBy2Plus1>& Y2,
std::array<float, kFftLengthBy2Plus1>* R2);
// Estimates the echo generating signal power as gated maximal power over a
// time window.
void EchoGeneratingPower(const VectorBuffer& spectrum_buffer,
const EchoCanceller3Config::EchoModel& echo_model,
int headroom_spectrum_buffer,
int filter_delay_blocks,
bool gain_limiter_running,
bool apply_noise_gating,
std::array<float, kFftLengthBy2Plus1>* X2) const;
// Updates estimate for the power of the stationary noise component in the
// render signal.
void RenderNoisePower(
const RenderBuffer& render_buffer,
std::array<float, kFftLengthBy2Plus1>* X2_noise_floor,
std::array<int, kFftLengthBy2Plus1>* X2_noise_floor_counter) const;
const EchoCanceller3Config config_;
std::array<float, kFftLengthBy2Plus1> R2_old_;
std::array<int, kFftLengthBy2Plus1> R2_hold_counter_;
std::array<float, kFftLengthBy2Plus1> X2_noise_floor_;
std::array<int, kFftLengthBy2Plus1> X2_noise_floor_counter_;
const bool soft_transparent_mode_;
const bool override_estimated_echo_path_gain_;
const bool use_fixed_nonlinear_reverb_model_;
std::unique_ptr<ReverbModel> echo_reverb_;
std::unique_ptr<ReverbModelFallback> echo_reverb_fallback;
RTC_DISALLOW_IMPLICIT_CONSTRUCTORS(ResidualEchoEstimator);
};
} // namespace webrtc
#endif // MODULES_AUDIO_PROCESSING_AEC3_RESIDUAL_ECHO_ESTIMATOR_H_
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