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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_MATCHED_FILTER_LAG_AGGREGATOR_H_
#define MODULES_AUDIO_PROCESSING_AEC3_MATCHED_FILTER_LAG_AGGREGATOR_H_
#include <vector>
#include "absl/types/optional.h"
#include "api/audio/echo_canceller3_config.h"
#include "modules/audio_processing/aec3/delay_estimate.h"
#include "modules/audio_processing/aec3/matched_filter.h"
namespace webrtc {
class ApmDataDumper;
// Aggregates lag estimates produced by the MatchedFilter class into a single
// reliable combined lag estimate.
class MatchedFilterLagAggregator {
public:
MatchedFilterLagAggregator(ApmDataDumper* data_dumper,
size_t max_filter_lag,
const EchoCanceller3Config::Delay& delay_config);
MatchedFilterLagAggregator() = delete;
MatchedFilterLagAggregator(const MatchedFilterLagAggregator&) = delete;
MatchedFilterLagAggregator& operator=(const MatchedFilterLagAggregator&) =
delete;
~MatchedFilterLagAggregator();
// Resets the aggregator.
void Reset(bool hard_reset);
// Aggregates the provided lag estimates.
absl::optional<DelayEstimate> Aggregate(
const absl::optional<const MatchedFilter::LagEstimate>& lag_estimate);
// Returns whether a reliable delay estimate has been found.
bool ReliableDelayFound() const { return significant_candidate_found_; }
// Returns the delay candidate that is computed by looking at the highest peak
// on the matched filters.
int GetDelayAtHighestPeak() const {
return highest_peak_aggregator_.candidate();
}
private:
class PreEchoLagAggregator {
public:
PreEchoLagAggregator(size_t max_filter_lag, size_t down_sampling_factor);
void Reset();
void Aggregate(int pre_echo_lag);
int pre_echo_candidate() const { return pre_echo_candidate_; }
void Dump(ApmDataDumper* const data_dumper);
private:
const int block_size_log2_;
const bool penalize_high_delays_initial_phase_;
std::array<int, 250> histogram_data_;
std::vector<int> histogram_;
int histogram_data_index_ = 0;
int pre_echo_candidate_ = 0;
int number_updates_ = 0;
};
class HighestPeakAggregator {
public:
explicit HighestPeakAggregator(size_t max_filter_lag);
void Reset();
void Aggregate(int lag);
int candidate() const { return candidate_; }
rtc::ArrayView<const int> histogram() const { return histogram_; }
private:
std::vector<int> histogram_;
std::array<int, 250> histogram_data_;
int histogram_data_index_ = 0;
int candidate_ = -1;
};
ApmDataDumper* const data_dumper_;
bool significant_candidate_found_ = false;
const EchoCanceller3Config::Delay::DelaySelectionThresholds thresholds_;
const int headroom_;
HighestPeakAggregator highest_peak_aggregator_;
std::unique_ptr<PreEchoLagAggregator> pre_echo_lag_aggregator_;
};
} // namespace webrtc
#endif // MODULES_AUDIO_PROCESSING_AEC3_MATCHED_FILTER_LAG_AGGREGATOR_H_
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