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1 // Copyright 2013 The Chromium Authors. All rights reserved. | 1 // Copyright 2013 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 // Creates a unified stream based on the cras (ChromeOS audio server) interface. | 5 // Creates a unified stream based on the cras (ChromeOS audio server) interface. |
6 // | 6 // |
7 // CrasUnifiedStream object is *not* thread-safe and should only be used | 7 // CrasUnifiedStream object is *not* thread-safe and should only be used |
8 // from the audio thread. | 8 // from the audio thread. |
9 | 9 |
10 #ifndef MEDIA_AUDIO_CRAS_CRAS_UNIFIED_H_ | 10 #ifndef MEDIA_AUDIO_CRAS_CRAS_UNIFIED_H_ |
11 #define MEDIA_AUDIO_CRAS_CRAS_UNIFIED_H_ | 11 #define MEDIA_AUDIO_CRAS_CRAS_UNIFIED_H_ |
12 | 12 |
13 #include <cras_client.h> | 13 #include <cras_client.h> |
14 #include <stddef.h> | 14 #include <stddef.h> |
15 #include <stdint.h> | 15 #include <stdint.h> |
16 | 16 |
17 #include <memory> | 17 #include <memory> |
18 | 18 |
19 #include "base/compiler_specific.h" | 19 #include "base/compiler_specific.h" |
20 #include "base/macros.h" | 20 #include "base/macros.h" |
| 21 #include "base/time/time.h" |
21 #include "media/audio/audio_io.h" | 22 #include "media/audio/audio_io.h" |
22 #include "media/base/audio_parameters.h" | 23 #include "media/base/audio_parameters.h" |
23 | 24 |
24 namespace media { | 25 namespace media { |
25 | 26 |
26 class AudioManagerCras; | 27 class AudioManagerCras; |
27 | 28 |
28 // Implementation of AudioOuputStream for Chrome OS using the Chrome OS audio | 29 // Implementation of AudioOuputStream for Chrome OS using the Chrome OS audio |
29 // server. | 30 // server. |
30 // TODO(dgreid): This class is used for only output, either remove all the | 31 // TODO(dgreid): This class is used for only output, either remove all the |
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43 // Implementation of AudioOutputStream. | 44 // Implementation of AudioOutputStream. |
44 bool Open() override; | 45 bool Open() override; |
45 void Close() override; | 46 void Close() override; |
46 void Start(AudioSourceCallback* callback) override; | 47 void Start(AudioSourceCallback* callback) override; |
47 void Stop() override; | 48 void Stop() override; |
48 void SetVolume(double volume) override; | 49 void SetVolume(double volume) override; |
49 void GetVolume(double* volume) override; | 50 void GetVolume(double* volume) override; |
50 | 51 |
51 private: | 52 private: |
52 // Convert Latency in time to bytes. | 53 // Convert Latency in time to bytes. |
53 uint32_t GetBytesLatency(const struct timespec& latency); | 54 base::TimeTicks GetTargetPlayoutTime(const struct timespec& latency_ts); |
54 | 55 |
55 // Handles captured audio and fills the ouput with audio to be played. | 56 // Handles captured audio and fills the ouput with audio to be played. |
56 static int UnifiedCallback(cras_client* client, | 57 static int UnifiedCallback(cras_client* client, |
57 cras_stream_id_t stream_id, | 58 cras_stream_id_t stream_id, |
58 uint8_t* input_samples, | 59 uint8_t* input_samples, |
59 uint8_t* output_samples, | 60 uint8_t* output_samples, |
60 unsigned int frames, | 61 unsigned int frames, |
61 const timespec* input_ts, | 62 const timespec* input_ts, |
62 const timespec* output_ts, | 63 const timespec* output_ts, |
63 void* arg); | 64 void* arg); |
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112 | 113 |
113 // Direciton of the stream. | 114 // Direciton of the stream. |
114 CRAS_STREAM_DIRECTION stream_direction_; | 115 CRAS_STREAM_DIRECTION stream_direction_; |
115 | 116 |
116 DISALLOW_COPY_AND_ASSIGN(CrasUnifiedStream); | 117 DISALLOW_COPY_AND_ASSIGN(CrasUnifiedStream); |
117 }; | 118 }; |
118 | 119 |
119 } // namespace media | 120 } // namespace media |
120 | 121 |
121 #endif // MEDIA_AUDIO_CRAS_CRAS_UNIFIED_H_ | 122 #endif // MEDIA_AUDIO_CRAS_CRAS_UNIFIED_H_ |
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