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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 <vector>
#include "api/array_view.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/include/audio_processing.h"
#include "rtc_base/constructormagic.h"
namespace webrtc {
class ResidualEchoEstimator {
public:
explicit ResidualEchoEstimator(
const AudioProcessing::Config::EchoCanceller3& 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);
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,
size_t delay,
std::array<float, kFftLengthBy2Plus1>* R2);
// Estimates the residual echo power based on the estimate of the echo path
// gain.
void NonLinearEstimate(bool headset_detected,
const std::array<float, kFftLengthBy2Plus1>& X2,
const std::array<float, kFftLengthBy2Plus1>& Y2,
std::array<float, kFftLengthBy2Plus1>* R2);
// Adds the estimated unmodelled echo power to the residual echo power
// estimate.
void AddEchoReverb(const std::array<float, kFftLengthBy2Plus1>& S2,
bool saturated_echo,
size_t delay,
float reverb_decay_factor,
std::array<float, kFftLengthBy2Plus1>* R2);
std::array<float, kFftLengthBy2Plus1> R2_old_;
std::array<int, kFftLengthBy2Plus1> R2_hold_counter_;
std::array<float, kFftLengthBy2Plus1> R2_reverb_;
int S2_old_index_ = 0;
std::array<std::array<float, kFftLengthBy2Plus1>, kAdaptiveFilterLength>
S2_old_;
std::array<float, kFftLengthBy2Plus1> X2_noise_floor_;
std::array<int, kFftLengthBy2Plus1> X2_noise_floor_counter_;
const AudioProcessing::Config::EchoCanceller3 config_;
RTC_DISALLOW_IMPLICIT_CONSTRUCTORS(ResidualEchoEstimator);
};
} // namespace webrtc
#endif // MODULES_AUDIO_PROCESSING_AEC3_RESIDUAL_ECHO_ESTIMATOR_H_
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