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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 <array>
#include <memory>
#include "absl/types/optional.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/spectrum_buffer.h"
#include "rtc_base/checks.h"
namespace webrtc {
class ResidualEchoEstimator {
public:
ResidualEchoEstimator(const EchoCanceller3Config& config,
size_t num_render_channels);
~ResidualEchoEstimator();
ResidualEchoEstimator(const ResidualEchoEstimator&) = delete;
ResidualEchoEstimator& operator=(const ResidualEchoEstimator&) = delete;
void Estimate(
const AecState& aec_state,
const RenderBuffer& render_buffer,
rtc::ArrayView<const std::array<float, kFftLengthBy2Plus1>> S2_linear,
rtc::ArrayView<const std::array<float, kFftLengthBy2Plus1>> Y2,
bool dominant_nearend,
rtc::ArrayView<std::array<float, kFftLengthBy2Plus1>> R2,
rtc::ArrayView<std::array<float, kFftLengthBy2Plus1>> R2_unbounded);
private:
enum class ReverbType { kLinear, kNonLinear };
// Resets the state.
void Reset();
// Updates estimate for the power of the stationary noise component in the
// render signal.
void UpdateRenderNoisePower(const RenderBuffer& render_buffer);
// Updates the reverb estimation.
void UpdateReverb(ReverbType reverb_type,
const AecState& aec_state,
const RenderBuffer& render_buffer);
// Adds the estimated unmodelled echo power to the residual echo power
// estimate.
void AddReverb(
rtc::ArrayView<std::array<float, kFftLengthBy2Plus1>> R2) const;
// Gets the echo path gain to apply.
float GetEchoPathGain(const AecState& aec_state,
bool gain_for_early_reflections) const;
const EchoCanceller3Config config_;
const size_t num_render_channels_;
const float early_reflections_transparent_mode_gain_;
const float late_reflections_transparent_mode_gain_;
const float early_reflections_general_gain_;
const float late_reflections_general_gain_;
const bool erle_onset_compensation_in_dominant_nearend_;
std::array<float, kFftLengthBy2Plus1> X2_noise_floor_;
std::array<int, kFftLengthBy2Plus1> X2_noise_floor_counter_;
ReverbModel echo_reverb_;
};
} // namespace webrtc
#endif // MODULES_AUDIO_PROCESSING_AEC3_RESIDUAL_ECHO_ESTIMATOR_H_
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