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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 // Implementation notes: | 5 // Implementation notes: |
6 // | 6 // |
7 // - It is recommended to first acquire the native sample rate of the default | 7 // - It is recommended to first acquire the native sample rate of the default |
8 // output device and then use the same rate when creating this object. | 8 // output device and then use the same rate when creating this object. |
9 // Use AUAudioOutputStream::HardwareSampleRate() to retrieve the sample rate. | 9 // Use AUAudioOutputStream::HardwareSampleRate() to retrieve the sample rate. |
10 // - Calling Close() also leads to self destruction. | 10 // - Calling Close() also leads to self destruction. |
11 // - The latency consists of two parts: | 11 // - The latency consists of two parts: |
12 // 1) Hardware latency, which includes Audio Unit latency, audio device | 12 // 1) Hardware latency, which includes Audio Unit latency, audio device |
13 // latency; | 13 // latency; |
14 // 2) The delay between the moment getting the callback and the scheduled time | 14 // 2) The delay between the moment getting the callback and the scheduled time |
15 // stamp that tells when the data is going to be played out. | 15 // stamp that tells when the data is going to be played out. |
16 // | 16 // |
17 #ifndef MEDIA_AUDIO_MAC_AUDIO_LOW_LATENCY_OUTPUT_MAC_H_ | 17 #ifndef MEDIA_AUDIO_MAC_AUDIO_LOW_LATENCY_OUTPUT_MAC_H_ |
18 #define MEDIA_AUDIO_MAC_AUDIO_LOW_LATENCY_OUTPUT_MAC_H_ | 18 #define MEDIA_AUDIO_MAC_AUDIO_LOW_LATENCY_OUTPUT_MAC_H_ |
19 | 19 |
20 #include <AudioUnit/AudioUnit.h> | 20 #include <AudioUnit/AudioUnit.h> |
21 | 21 |
22 #include "base/memory/scoped_ptr.h" | 22 #include "base/memory/scoped_ptr.h" |
23 #include "media/audio/audio_io.h" | 23 #include "media/audio/audio_io.h" |
24 #include "media/audio/audio_parameters.h" | 24 #include "media/audio/audio_parameters.h" |
25 | 25 |
26 namespace media { | |
27 | |
28 class AudioManagerMac; | 26 class AudioManagerMac; |
29 | 27 |
30 // Implementation of AudioOuputStream for Mac OS X using the | 28 // Implementation of AudioOuputStream for Mac OS X using the |
31 // default output Audio Unit present in OS 10.4 and later. | 29 // default output Audio Unit present in OS 10.4 and later. |
32 // The default output Audio Unit is for low-latency audio I/O. | 30 // The default output Audio Unit is for low-latency audio I/O. |
33 class AUAudioOutputStream : public AudioOutputStream { | 31 class AUAudioOutputStream : public AudioOutputStream { |
34 public: | 32 public: |
35 // The ctor takes all the usual parameters, plus |manager| which is the | 33 // The ctor takes all the usual parameters, plus |manager| which is the |
36 // the audio manager who is creating this object. | 34 // the audio manager who is creating this object. |
37 AUAudioOutputStream(AudioManagerMac* manager, | 35 AUAudioOutputStream(AudioManagerMac* manager, |
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94 | 92 |
95 // Fixed playout hardware latency in frames. | 93 // Fixed playout hardware latency in frames. |
96 double hardware_latency_frames_; | 94 double hardware_latency_frames_; |
97 | 95 |
98 // The flag used to stop the streaming. | 96 // The flag used to stop the streaming. |
99 bool stopped_; | 97 bool stopped_; |
100 | 98 |
101 DISALLOW_COPY_AND_ASSIGN(AUAudioOutputStream); | 99 DISALLOW_COPY_AND_ASSIGN(AUAudioOutputStream); |
102 }; | 100 }; |
103 | 101 |
104 } // namespace media | |
105 | |
106 #endif // MEDIA_AUDIO_MAC_AUDIO_LOW_LATENCY_OUTPUT_MAC_H_ | 102 #endif // MEDIA_AUDIO_MAC_AUDIO_LOW_LATENCY_OUTPUT_MAC_H_ |
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