signal_model_estimator.h

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/*

 *  Copyright (c) 2019 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_NS_SIGNAL_MODEL_ESTIMATOR_H_

#define MODULES_AUDIO_PROCESSING_NS_SIGNAL_MODEL_ESTIMATOR_H_

#include <array>

#include "api/array_view.h"

#include "modules/audio_processing/ns/histograms.h"

#include "modules/audio_processing/ns/ns_common.h"

#include "modules/audio_processing/ns/prior_signal_model.h"

#include "modules/audio_processing/ns/prior_signal_model_estimator.h"

#include "modules/audio_processing/ns/signal_model.h"

namespace webrtc {

class SignalModelEstimator {

 public:

  SignalModelEstimator();

  SignalModelEstimator(const SignalModelEstimator&) = delete;

  SignalModelEstimator& operator=(const SignalModelEstimator&) = delete;

  // Compute signal normalization during the initial startup phase.

  void AdjustNormalization(int32_t num_analyzed_frames, float signal_energy);

  void Update(

      rtc::ArrayView<const float, kFftSizeBy2Plus1> prior_snr,

      rtc::ArrayView<const float, kFftSizeBy2Plus1> post_snr,

      rtc::ArrayView<const float, kFftSizeBy2Plus1> conservative_noise_spectrum,

      rtc::ArrayView<const float, kFftSizeBy2Plus1> signal_spectrum,

      float signal_spectral_sum,

      float signal_energy);

  const PriorSignalModel& get_prior_model() const {

    return prior_model_estimator_.get_prior_model();

  const SignalModel& get_model() { return features_; }

 private:

  float diff_normalization_ = 0.f;

  float signal_energy_sum_ = 0.f;

  Histograms histograms_;

  int histogram_analysis_counter_ = 500;

  PriorSignalModelEstimator prior_model_estimator_;

  SignalModel features_;

};

}  // namespace webrtc

#endif  // MODULES_AUDIO_PROCESSING_NS_SIGNAL_MODEL_ESTIMATOR_H_