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// Copyright 2012 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef REMOTING_HOST_AUDIO_SILENCE_DETECTOR_H_
#define REMOTING_HOST_AUDIO_SILENCE_DETECTOR_H_
#include <stddef.h>
#include <stdint.h>
namespace remoting {
// Helper used in audio capturers to detect and drop silent audio packets.
class AudioSilenceDetector {
public:
// |threshold| is used to specify maximum absolute sample value that should
// still be considered as silence.
explicit AudioSilenceDetector(int threshold);
~AudioSilenceDetector();
void Reset(int sampling_rate, int channels);
// Must be called for each new chunk of data. Return true the given packet
// is silence should be dropped.
bool IsSilence(const int16_t* samples, size_t frames);
// The count of channels received from last Reset().
int channels() const;
private:
// Maximum absolute sample value that should still be considered as silence.
int threshold_;
// Silence period threshold in samples. Silence intervals shorter than this
// value are still encoded and sent to the client, so that we don't disrupt
// playback by dropping them.
int silence_length_max_;
// Lengths of the current silence period in samples.
int silence_length_;
// The count of channels.
int channels_;
};
} // namespace remoting
#endif // REMOTING_HOST_AUDIO_SILENCE_DETECTOR_H_
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