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/*
* Copyright (c) 2012 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_VAD_PITCH_BASED_VAD_H_
#define MODULES_AUDIO_PROCESSING_VAD_PITCH_BASED_VAD_H_
#include <memory>
#include "modules/audio_processing/vad/common.h"
#include "modules/audio_processing/vad/gmm.h"
namespace webrtc {
class VadCircularBuffer;
// Computes the probability of the input audio frame to be active given
// the corresponding pitch-gain and lag of the frame.
class PitchBasedVad {
public:
PitchBasedVad();
~PitchBasedVad();
// Compute pitch-based voicing probability, given the features.
// features: a structure containing features required for computing voicing
// probabilities.
//
// p_combined: an array which contains the combined activity probabilities
// computed prior to the call of this function. The method,
// then, computes the voicing probabilities and combine them
// with the given values. The result are returned in `p`.
int VoicingProbability(const AudioFeatures& features, double* p_combined);
private:
int UpdatePrior(double p);
// TODO(turajs): maybe defining this at a higher level (maybe enum) so that
// all the code recognize it as "no-error."
static const int kNoError = 0;
GmmParameters noise_gmm_;
GmmParameters voice_gmm_;
double p_prior_;
std::unique_ptr<VadCircularBuffer> circular_buffer_;
};
} // namespace webrtc
#endif // MODULES_AUDIO_PROCESSING_VAD_PITCH_BASED_VAD_H_
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