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/*
* Copyright (c) 2018 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_ECHO_AUDIBILITY_H_
#define MODULES_AUDIO_PROCESSING_AEC3_ECHO_AUDIBILITY_H_
#include <stddef.h>
#include "absl/types/optional.h"
#include "api/array_view.h"
#include "modules/audio_processing/aec3/block_buffer.h"
#include "modules/audio_processing/aec3/render_buffer.h"
#include "modules/audio_processing/aec3/spectrum_buffer.h"
#include "modules/audio_processing/aec3/stationarity_estimator.h"
namespace webrtc {
class EchoAudibility {
public:
explicit EchoAudibility(bool use_render_stationarity_at_init);
~EchoAudibility();
EchoAudibility(const EchoAudibility&) = delete;
EchoAudibility& operator=(const EchoAudibility&) = delete;
// Feed new render data to the echo audibility estimator.
void Update(const RenderBuffer& render_buffer,
rtc::ArrayView<const float> average_reverb,
int min_channel_delay_blocks,
bool external_delay_seen);
// Get the residual echo scaling.
void GetResidualEchoScaling(bool filter_has_had_time_to_converge,
rtc::ArrayView<float> residual_scaling) const {
for (size_t band = 0; band < residual_scaling.size(); ++band) {
if (render_stationarity_.IsBandStationary(band) &&
(filter_has_had_time_to_converge ||
use_render_stationarity_at_init_)) {
residual_scaling[band] = 0.f;
} else {
residual_scaling[band] = 1.0f;
}
}
}
// Returns true if the current render block is estimated as stationary.
bool IsBlockStationary() const {
return render_stationarity_.IsBlockStationary();
}
private:
// Reset the EchoAudibility class.
void Reset();
// Updates the render stationarity flags for the current frame.
void UpdateRenderStationarityFlags(const RenderBuffer& render_buffer,
rtc::ArrayView<const float> average_reverb,
int delay_blocks);
// Updates the noise estimator with the new render data since the previous
// call to this method.
void UpdateRenderNoiseEstimator(const SpectrumBuffer& spectrum_buffer,
const BlockBuffer& block_buffer,
bool external_delay_seen);
// Returns a bool being true if the render signal contains just close to zero
// values.
bool IsRenderTooLow(const BlockBuffer& block_buffer);
absl::optional<int> render_spectrum_write_prev_;
int render_block_write_prev_;
bool non_zero_render_seen_;
const bool use_render_stationarity_at_init_;
StationarityEstimator render_stationarity_;
};
} // namespace webrtc
#endif // MODULES_AUDIO_PROCESSING_AEC3_ECHO_AUDIBILITY_H_
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