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1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. | 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 | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 #ifndef REMOTING_HOST_AUDIO_SILENCE_DETECTOR_H_ | 5 #ifndef REMOTING_HOST_AUDIO_SILENCE_DETECTOR_H_ |
6 #define REMOTING_HOST_AUDIO_SILENCE_DETECTOR_H_ | 6 #define REMOTING_HOST_AUDIO_SILENCE_DETECTOR_H_ |
7 | 7 |
8 #include "base/basictypes.h" | 8 #include <stddef.h> |
| 9 #include <stdint.h> |
| 10 |
9 #include "base/logging.h" | 11 #include "base/logging.h" |
10 | 12 |
11 namespace remoting { | 13 namespace remoting { |
12 | 14 |
13 // Helper used in audio capturers to detect and drop silent audio packets. | 15 // Helper used in audio capturers to detect and drop silent audio packets. |
14 class AudioSilenceDetector { | 16 class AudioSilenceDetector { |
15 public: | 17 public: |
16 // |threshold| is used to specify maximum absolute sample value that should | 18 // |threshold| is used to specify maximum absolute sample value that should |
17 // still be considered as silence. | 19 // still be considered as silence. |
18 explicit AudioSilenceDetector(int threshold); | 20 explicit AudioSilenceDetector(int threshold); |
19 ~AudioSilenceDetector(); | 21 ~AudioSilenceDetector(); |
20 | 22 |
21 void Reset(int sampling_rate, int channels); | 23 void Reset(int sampling_rate, int channels); |
22 | 24 |
23 // Must be called for each new chunk of data. Return true the given packet | 25 // Must be called for each new chunk of data. Return true the given packet |
24 // is silence should be dropped. | 26 // is silence should be dropped. |
25 bool IsSilence(const int16* samples, size_t samples_count); | 27 bool IsSilence(const int16_t* samples, size_t samples_count); |
26 | 28 |
27 private: | 29 private: |
28 // Maximum absolute sample value that should still be considered as silence. | 30 // Maximum absolute sample value that should still be considered as silence. |
29 int threshold_; | 31 int threshold_; |
30 | 32 |
31 // Silence period threshold in samples. Silence intervals shorter than this | 33 // 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 | 34 // value are still encoded and sent to the client, so that we don't disrupt |
33 // playback by dropping them. | 35 // playback by dropping them. |
34 int silence_length_max_; | 36 int silence_length_max_; |
35 | 37 |
36 // Lengths of the current silence period in samples. | 38 // Lengths of the current silence period in samples. |
37 int silence_length_; | 39 int silence_length_; |
38 }; | 40 }; |
39 | 41 |
40 } // namespace remoting | 42 } // namespace remoting |
41 | 43 |
42 #endif // REMOTING_HOST_AUDIO_SILENCE_DETECTOR_H_ | 44 #endif // REMOTING_HOST_AUDIO_SILENCE_DETECTOR_H_ |
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