speech_probability_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_SPEECH_PROBABILITY_ESTIMATOR_H_

#define MODULES_AUDIO_PROCESSING_NS_SPEECH_PROBABILITY_ESTIMATOR_H_

#include <array>

#include "api/array_view.h"

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

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

namespace webrtc {

// Class for estimating the probability of speech.

class SpeechProbabilityEstimator {

 public:

  SpeechProbabilityEstimator();

  SpeechProbabilityEstimator(const SpeechProbabilityEstimator&) = delete;

  SpeechProbabilityEstimator& operator=(const SpeechProbabilityEstimator&) =

      delete;

  // Compute speech probability.

  void Update(

      int32_t num_analyzed_frames,

      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);

  float get_prior_probability() const { return prior_speech_prob_; }

  rtc::ArrayView<const float> get_probability() { return speech_probability_; }

 private:

  SignalModelEstimator signal_model_estimator_;

  float prior_speech_prob_ = .5f;

  std::array<float, kFftSizeBy2Plus1> speech_probability_;

};

}  // namespace webrtc

#endif  // MODULES_AUDIO_PROCESSING_NS_SPEECH_PROBABILITY_ESTIMATOR_H_