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82 lines
2.9 KiB
C
82 lines
2.9 KiB
C
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/*
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* Copyright (c) 2017 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_ERLE_ESTIMATOR_H_
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#define MODULES_AUDIO_PROCESSING_AEC3_ERLE_ESTIMATOR_H_
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#include <stddef.h>
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#include <array>
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#include <memory>
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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/aec3_common.h"
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#include "modules/audio_processing/aec3/fullband_erle_estimator.h"
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#include "modules/audio_processing/aec3/subband_erle_estimator.h"
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#include "modules/audio_processing/logging/apm_data_dumper.h"
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namespace webrtc {
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// Estimates the echo return loss enhancement. One estimate is done per subband
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// and another one is done using the aggreation of energy over all the subbands.
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class ErleEstimator {
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public:
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ErleEstimator(size_t startup_phase_length_blocks_,
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float min_erle,
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float max_erle_lf,
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float max_erle_hf);
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~ErleEstimator();
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// Resets the fullband ERLE estimator and the subbands ERLE estimators.
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void Reset(bool delay_change);
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// Updates the ERLE estimates.
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void Update(rtc::ArrayView<const float> reverb_render_spectrum,
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rtc::ArrayView<const float> capture_spectrum,
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rtc::ArrayView<const float> subtractor_spectrum,
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bool converged_filter,
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bool onset_detection);
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// Returns the most recent subband ERLE estimates.
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const std::array<float, kFftLengthBy2Plus1>& Erle() const {
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return subband_erle_estimator_.Erle();
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}
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// Returns the subband ERLE that are estimated during onsets. Used
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// for logging/testing.
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const std::array<float, kFftLengthBy2Plus1>& ErleOnsets() const {
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return subband_erle_estimator_.ErleOnsets();
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}
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// Returns the fullband ERLE estimate.
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float FullbandErleLog2() const {
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return fullband_erle_estimator_.FullbandErleLog2();
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}
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// Returns an estimation of the current linear filter quality based on the
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// current and past fullband ERLE estimates. The returned value is a float
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// between 0 and 1 where 1 indicates that, at this current time instant, the
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// linear filter is reaching its maximum subtraction performance.
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absl::optional<float> GetInstLinearQualityEstimate() const {
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return fullband_erle_estimator_.GetInstLinearQualityEstimate();
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}
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void Dump(const std::unique_ptr<ApmDataDumper>& data_dumper) const;
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private:
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const size_t startup_phase_length_blocks__;
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FullBandErleEstimator fullband_erle_estimator_;
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SubbandErleEstimator subband_erle_estimator_;
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size_t blocks_since_reset_ = 0;
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};
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} // namespace webrtc
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#endif // MODULES_AUDIO_PROCESSING_AEC3_ERLE_ESTIMATOR_H_
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