| // Copyright (c) 2012 The Chromium Authors. All rights reserved. |
| // 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 "base/basictypes.h" |
| #include "base/logging.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. |
| 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* samples, size_t samples_count); |
| |
| 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_; |
| }; |
| |
| } // namespace remoting |
| |
| #endif // REMOTING_HOST_AUDIO_SILENCE_DETECTOR_H_ |