86 lines
3.0 KiB
C
86 lines
3.0 KiB
C
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/*
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* Copyright (c) 2018 The WebRTC project authors. All Rights Reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#ifndef MODULES_AUDIO_PROCESSING_AEC3_ECHO_AUDIBILITY_H_
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#define MODULES_AUDIO_PROCESSING_AEC3_ECHO_AUDIBILITY_H_
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#include <stddef.h>
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#include "absl/types/optional.h"
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#include "api/array_view.h"
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#include "modules/audio_processing/aec3/block_buffer.h"
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#include "modules/audio_processing/aec3/render_buffer.h"
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#include "modules/audio_processing/aec3/spectrum_buffer.h"
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#include "modules/audio_processing/aec3/stationarity_estimator.h"
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namespace webrtc {
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class EchoAudibility {
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public:
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explicit EchoAudibility(bool use_render_stationarity_at_init);
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~EchoAudibility();
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EchoAudibility(const EchoAudibility&) = delete;
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EchoAudibility& operator=(const EchoAudibility&) = delete;
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// Feed new render data to the echo audibility estimator.
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void Update(const RenderBuffer& render_buffer,
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rtc::ArrayView<const float> average_reverb,
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int min_channel_delay_blocks,
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bool external_delay_seen);
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// Get the residual echo scaling.
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void GetResidualEchoScaling(bool filter_has_had_time_to_converge,
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rtc::ArrayView<float> residual_scaling) const {
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for (size_t band = 0; band < residual_scaling.size(); ++band) {
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if (render_stationarity_.IsBandStationary(band) &&
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(filter_has_had_time_to_converge ||
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use_render_stationarity_at_init_)) {
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residual_scaling[band] = 0.f;
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} else {
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residual_scaling[band] = 1.0f;
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}
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}
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}
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// Returns true if the current render block is estimated as stationary.
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bool IsBlockStationary() const {
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return render_stationarity_.IsBlockStationary();
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}
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private:
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// Reset the EchoAudibility class.
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void Reset();
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// Updates the render stationarity flags for the current frame.
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void UpdateRenderStationarityFlags(const RenderBuffer& render_buffer,
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rtc::ArrayView<const float> average_reverb,
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int delay_blocks);
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// Updates the noise estimator with the new render data since the previous
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// call to this method.
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void UpdateRenderNoiseEstimator(const SpectrumBuffer& spectrum_buffer,
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const BlockBuffer& block_buffer,
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bool external_delay_seen);
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// Returns a bool being true if the render signal contains just close to zero
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// values.
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bool IsRenderTooLow(const BlockBuffer& block_buffer);
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absl::optional<int> render_spectrum_write_prev_;
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int render_block_write_prev_;
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bool non_zero_render_seen_;
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const bool use_render_stationarity_at_init_;
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StationarityEstimator render_stationarity_;
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};
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} // namespace webrtc
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#endif // MODULES_AUDIO_PROCESSING_AEC3_ECHO_AUDIBILITY_H_
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