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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_ECHO_PATH_DELAY_ESTIMATOR_H_
#define MODULES_AUDIO_PROCESSING_AEC3_ECHO_PATH_DELAY_ESTIMATOR_H_
#include <stddef.h>
#include "absl/types/optional.h"
#include "api/array_view.h"
#include "modules/audio_processing/aec3/alignment_mixer.h"
#include "modules/audio_processing/aec3/clockdrift_detector.h"
#include "modules/audio_processing/aec3/decimator.h"
#include "modules/audio_processing/aec3/delay_estimate.h"
#include "modules/audio_processing/aec3/matched_filter.h"
#include "modules/audio_processing/aec3/matched_filter_lag_aggregator.h"
#include "rtc_base/constructor_magic.h"
namespace webrtc {
class ApmDataDumper;
struct DownsampledRenderBuffer;
struct EchoCanceller3Config;
// Estimates the delay of the echo path.
class EchoPathDelayEstimator {
public:
EchoPathDelayEstimator(ApmDataDumper* data_dumper,
const EchoCanceller3Config& config,
size_t num_capture_channels);
~EchoPathDelayEstimator();
// Resets the estimation. If the delay confidence is reset, the reset behavior
// is as if the call is restarted.
void Reset(bool reset_delay_confidence);
// Produce a delay estimate if such is avaliable.
absl::optional<DelayEstimate> EstimateDelay(
const DownsampledRenderBuffer& render_buffer,
const std::vector<std::vector<float>>& capture);
// Log delay estimator properties.
void LogDelayEstimationProperties(int sample_rate_hz, size_t shift) const {
matched_filter_.LogFilterProperties(sample_rate_hz, shift,
down_sampling_factor_);
}
// Returns the level of detected clockdrift.
ClockdriftDetector::Level Clockdrift() const {
return clockdrift_detector_.ClockdriftLevel();
}
private:
ApmDataDumper* const data_dumper_;
const size_t down_sampling_factor_;
const size_t sub_block_size_;
AlignmentMixer capture_mixer_;
Decimator capture_decimator_;
MatchedFilter matched_filter_;
MatchedFilterLagAggregator matched_filter_lag_aggregator_;
absl::optional<DelayEstimate> old_aggregated_lag_;
size_t consistent_estimate_counter_ = 0;
ClockdriftDetector clockdrift_detector_;
// Internal reset method with more granularity.
void Reset(bool reset_lag_aggregator, bool reset_delay_confidence);
RTC_DISALLOW_COPY_AND_ASSIGN(EchoPathDelayEstimator);
};
} // namespace webrtc
#endif // MODULES_AUDIO_PROCESSING_AEC3_ECHO_PATH_DELAY_ESTIMATOR_H_
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