1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style license that can be 3 // found in the LICENSE file. 4 5 #ifndef REMOTING_HOST_AUDIO_SILENCE_DETECTOR_H_ 6 #define REMOTING_HOST_AUDIO_SILENCE_DETECTOR_H_ 7 8 #include "base/basictypes.h" 9 #include "base/logging.h" 10 11 namespace remoting { 12 13 // Helper used in audio capturers to detect and drop silent audio packets. 14 class AudioSilenceDetector { 15 public: 16 // |threshold| is used to specify maximum absolute sample value that should 17 // still be considered as silence. 18 AudioSilenceDetector(int threshold); 19 ~AudioSilenceDetector(); 20 21 void Reset(int sampling_rate, int channels); 22 23 // Must be called for each new chunk of data. Return true the given packet 24 // is silence should be dropped. 25 bool IsSilence(const int16* samples, size_t samples_count); 26 27 private: 28 // Maximum absolute sample value that should still be considered as silence. 29 int threshold_; 30 31 // Silence period threshold in samples. Silence intervals shorter than this 32 // value are still encoded and sent to the client, so that we don't disrupt 33 // playback by dropping them. 34 int silence_length_max_; 35 36 // Lengths of the current silence period in samples. 37 int silence_length_; 38 }; 39 40 } // namespace remoting 41 42 #endif // REMOTING_HOST_AUDIO_SILENCE_DETECTOR_H_ 43
