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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_SUPPRESSION_GAIN_H_
#define MODULES_AUDIO_PROCESSING_AEC3_SUPPRESSION_GAIN_H_
#include <array>
#include <atomic>
#include <memory>
#include <optional>
#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/fft_data.h"
#include "modules/audio_processing/aec3/moving_average.h"
#include "modules/audio_processing/aec3/nearend_detector.h"
#include "modules/audio_processing/aec3/render_signal_analyzer.h"
#include "modules/audio_processing/logging/apm_data_dumper.h"
namespace webrtc {
class SuppressionGain {
public:
SuppressionGain(const EchoCanceller3Config& config,
Aec3Optimization optimization,
int sample_rate_hz,
size_t num_capture_channels);
~SuppressionGain();
SuppressionGain(const SuppressionGain&) = delete;
SuppressionGain& operator=(const SuppressionGain&) = delete;
void GetGain(
ArrayView<const std::array<float, kFftLengthBy2Plus1>> nearend_spectrum,
ArrayView<const std::array<float, kFftLengthBy2Plus1>> echo_spectrum,
ArrayView<const std::array<float, kFftLengthBy2Plus1>>
residual_echo_spectrum,
ArrayView<const std::array<float, kFftLengthBy2Plus1>>
residual_echo_spectrum_unbounded,
ArrayView<const std::array<float, kFftLengthBy2Plus1>>
comfort_noise_spectrum,
const RenderSignalAnalyzer& render_signal_analyzer,
const AecState& aec_state,
const Block& render,
bool clock_drift,
float* high_bands_gain,
std::array<float, kFftLengthBy2Plus1>* low_band_gain);
bool IsDominantNearend() {
return dominant_nearend_detector_->IsNearendState();
}
// Toggles the usage of the initial state.
void SetInitialState(bool state);
private:
// Computes the gain to apply for the bands beyond the first band.
float UpperBandsGain(
ArrayView<const std::array<float, kFftLengthBy2Plus1>> echo_spectrum,
ArrayView<const std::array<float, kFftLengthBy2Plus1>>
comfort_noise_spectrum,
const std::optional<int>& narrow_peak_band,
bool saturated_echo,
const Block& render,
const std::array<float, kFftLengthBy2Plus1>& low_band_gain) const;
void GainToNoAudibleEcho(const std::array<float, kFftLengthBy2Plus1>& nearend,
const std::array<float, kFftLengthBy2Plus1>& echo,
const std::array<float, kFftLengthBy2Plus1>& masker,
std::array<float, kFftLengthBy2Plus1>* gain) const;
void LowerBandGain(
bool stationary_with_low_power,
const AecState& aec_state,
ArrayView<const std::array<float, kFftLengthBy2Plus1>> suppressor_input,
ArrayView<const std::array<float, kFftLengthBy2Plus1>> residual_echo,
ArrayView<const std::array<float, kFftLengthBy2Plus1>> comfort_noise,
bool clock_drift,
std::array<float, kFftLengthBy2Plus1>* gain);
void GetMinGain(ArrayView<const float> weighted_residual_echo,
ArrayView<const float> last_nearend,
ArrayView<const float> last_echo,
bool low_noise_render,
bool saturated_echo,
ArrayView<float> min_gain) const;
void GetMaxGain(ArrayView<float> max_gain) const;
class LowNoiseRenderDetector {
public:
bool Detect(const Block& render);
private:
float average_power_ = 32768.f * 32768.f;
};
struct GainParameters {
explicit GainParameters(
int last_lf_band,
int first_hf_band,
const EchoCanceller3Config::Suppressor::Tuning& tuning);
const float max_inc_factor;
const float max_dec_factor_lf;
std::array<float, kFftLengthBy2Plus1> enr_transparent_;
std::array<float, kFftLengthBy2Plus1> enr_suppress_;
std::array<float, kFftLengthBy2Plus1> emr_transparent_;
};
static std::atomic<int> instance_count_;
std::unique_ptr<ApmDataDumper> data_dumper_;
const Aec3Optimization optimization_;
const EchoCanceller3Config config_;
const size_t num_capture_channels_;
const int state_change_duration_blocks_;
std::array<float, kFftLengthBy2Plus1> last_gain_;
std::vector<std::array<float, kFftLengthBy2Plus1>> last_nearend_;
std::vector<std::array<float, kFftLengthBy2Plus1>> last_echo_;
LowNoiseRenderDetector low_render_detector_;
bool initial_state_ = true;
int initial_state_change_counter_ = 0;
std::vector<aec3::MovingAverage> nearend_smoothers_;
const GainParameters nearend_params_;
const GainParameters normal_params_;
// Determines if the dominant nearend detector uses the unbounded residual
// echo spectrum.
const bool use_unbounded_echo_spectrum_;
std::unique_ptr<NearendDetector> dominant_nearend_detector_;
};
} // namespace webrtc
#endif // MODULES_AUDIO_PROCESSING_AEC3_SUPPRESSION_GAIN_H_
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