58 lines
1.8 KiB
C
58 lines
1.8 KiB
C
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/*
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* Copyright (c) 2012 The WebRTC project authors. All Rights Reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#ifndef MODULES_AUDIO_PROCESSING_VAD_PITCH_BASED_VAD_H_
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#define MODULES_AUDIO_PROCESSING_VAD_PITCH_BASED_VAD_H_
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#include <memory>
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#include "modules/audio_processing/vad/common.h"
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#include "modules/audio_processing/vad/gmm.h"
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namespace webrtc {
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class VadCircularBuffer;
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// Computes the probability of the input audio frame to be active given
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// the corresponding pitch-gain and lag of the frame.
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class PitchBasedVad {
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public:
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PitchBasedVad();
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~PitchBasedVad();
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// Compute pitch-based voicing probability, given the features.
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// features: a structure containing features required for computing voicing
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// probabilities.
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//
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// p_combined: an array which contains the combined activity probabilities
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// computed prior to the call of this function. The method,
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// then, computes the voicing probabilities and combine them
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// with the given values. The result are returned in `p`.
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int VoicingProbability(const AudioFeatures& features, double* p_combined);
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private:
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int UpdatePrior(double p);
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// TODO(turajs): maybe defining this at a higher level (maybe enum) so that
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// all the code recognize it as "no-error."
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static const int kNoError = 0;
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GmmParameters noise_gmm_;
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GmmParameters voice_gmm_;
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double p_prior_;
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std::unique_ptr<VadCircularBuffer> circular_buffer_;
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};
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} // namespace webrtc
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#endif // MODULES_AUDIO_PROCESSING_VAD_PITCH_BASED_VAD_H_
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