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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_REVERB_MODEL_ESTIMATOR_H_
#define MODULES_AUDIO_PROCESSING_AEC3_REVERB_MODEL_ESTIMATOR_H_
#include <array>
#include <memory>
#include <vector>
#include "absl/types/optional.h"
#include "api/array_view.h"
#include "api/audio/echo_canceller3_config.h"
#include "modules/audio_processing/aec3/aec3_common.h" // kFftLengthBy2Plus1
#include "modules/audio_processing/aec3/reverb_decay_estimator.h"
#include "modules/audio_processing/aec3/reverb_frequency_response.h"
namespace webrtc {
class ApmDataDumper;
// Class for estimating the model parameters for the reverberant echo.
class ReverbModelEstimator {
public:
ReverbModelEstimator(const EchoCanceller3Config& config,
size_t num_capture_channels);
~ReverbModelEstimator();
// Updates the estimates based on new data.
void Update(
rtc::ArrayView<const std::vector<float>> impulse_responses,
rtc::ArrayView<const std::vector<std::array<float, kFftLengthBy2Plus1>>>
frequency_responses,
rtc::ArrayView<const absl::optional<float>> linear_filter_qualities,
rtc::ArrayView<const int> filter_delays_blocks,
const std::vector<bool>& usable_linear_estimates,
bool stationary_block);
// Returns the exponential decay of the reverberant echo. The parameter `mild`
// indicates which exponential decay to return, the default one or a milder
// one.
// TODO(peah): Correct to properly support multiple channels.
float ReverbDecay(bool mild) const {
return reverb_decay_estimators_[0]->Decay(mild);
}
// Return the frequency response of the reverberant echo.
// TODO(peah): Correct to properly support multiple channels.
rtc::ArrayView<const float> GetReverbFrequencyResponse() const {
return reverb_frequency_responses_[0].FrequencyResponse();
}
// Dumps debug data.
void Dump(ApmDataDumper* data_dumper) const {
reverb_decay_estimators_[0]->Dump(data_dumper);
}
private:
std::vector<std::unique_ptr<ReverbDecayEstimator>> reverb_decay_estimators_;
std::vector<ReverbFrequencyResponse> reverb_frequency_responses_;
};
} // namespace webrtc
#endif // MODULES_AUDIO_PROCESSING_AEC3_REVERB_MODEL_ESTIMATOR_H_