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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_VOICE_DETECTION_H_
#define MODULES_AUDIO_PROCESSING_VOICE_DETECTION_H_
#include <stddef.h>
#include <memory>
#include "modules/audio_processing/include/audio_processing.h"
namespace webrtc {
class AudioBuffer;
// The voice activity detection (VAD) component analyzes the stream to
// determine if voice is present.
class VoiceDetection {
public:
// Specifies the likelihood that a frame will be declared to contain voice.
// A higher value makes it more likely that speech will not be clipped, at
// the expense of more noise being detected as voice.
enum Likelihood {
kVeryLowLikelihood,
kLowLikelihood,
kModerateLikelihood,
kHighLikelihood
};
VoiceDetection(int sample_rate_hz, Likelihood likelihood);
~VoiceDetection();
VoiceDetection(VoiceDetection&) = delete;
VoiceDetection& operator=(VoiceDetection&) = delete;
// Returns true if voice is detected in the current frame.
bool ProcessCaptureAudio(AudioBuffer* audio);
Likelihood likelihood() const { return likelihood_; }
private:
class Vad;
int sample_rate_hz_;
size_t frame_size_samples_;
Likelihood likelihood_;
std::unique_ptr<Vad> vad_;
};
} // namespace webrtc
#endif // MODULES_AUDIO_PROCESSING_VOICE_DETECTION_H_
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