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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 MEDIA_AUDIO_MAC_AUDIO_MANAGER_MAC_H_ | 5 #ifndef MEDIA_AUDIO_MAC_AUDIO_MANAGER_MAC_H_ |
6 #define MEDIA_AUDIO_MAC_AUDIO_MANAGER_MAC_H_ | 6 #define MEDIA_AUDIO_MAC_AUDIO_MANAGER_MAC_H_ |
7 | 7 |
8 #include <AudioUnit/AudioUnit.h> | 8 #include <AudioUnit/AudioUnit.h> |
9 #include <CoreAudio/AudioHardware.h> | 9 #include <CoreAudio/AudioHardware.h> |
10 #include <list> | 10 #include <list> |
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69 static int HardwareSampleRate(); | 69 static int HardwareSampleRate(); |
70 | 70 |
71 // OSX has issues with starting streams as the sytem goes into suspend and | 71 // OSX has issues with starting streams as the sytem goes into suspend and |
72 // immediately after it wakes up from resume. See http://crbug.com/160920. | 72 // immediately after it wakes up from resume. See http://crbug.com/160920. |
73 // As a workaround we delay Start() when it occurs after suspend and for a | 73 // As a workaround we delay Start() when it occurs after suspend and for a |
74 // small amount of time after resume. | 74 // small amount of time after resume. |
75 // | 75 // |
76 // Streams should consult ShouldDeferStreamStart() and if true check the value | 76 // Streams should consult ShouldDeferStreamStart() and if true check the value |
77 // again after |kStartDelayInSecsForPowerEvents| has elapsed. If false, the | 77 // again after |kStartDelayInSecsForPowerEvents| has elapsed. If false, the |
78 // stream may be started immediately. | 78 // stream may be started immediately. |
79 enum { kStartDelayInSecsForPowerEvents = 1 }; | 79 enum { kStartDelayInSecsForPowerEvents = 2 }; |
80 bool ShouldDeferStreamStart(); | 80 bool ShouldDeferStreamStart(); |
81 | 81 |
82 // Changes the buffer size for |device_id| if there are no active input or | 82 // Changes the buffer size for |device_id| if there are no active input or |
83 // output streams on the device or |desired_buffer_size| is lower than the | 83 // output streams on the device or |desired_buffer_size| is lower than the |
84 // current device buffer size. | 84 // current device buffer size. |
85 // | 85 // |
86 // Returns false if an error occurred. There is no indication if the buffer | 86 // Returns false if an error occurred. There is no indication if the buffer |
87 // size was changed or not. | 87 // size was changed or not. |
88 // |element| is 0 for output streams and 1 for input streams. | 88 // |element| is 0 for output streams and 1 for input streams. |
89 // TODO(dalecurtis): we could change the the last parameter to an input/output | 89 // TODO(dalecurtis): we could change the the last parameter to an input/output |
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129 std::list<AudioInputStream*> basic_input_streams_; | 129 std::list<AudioInputStream*> basic_input_streams_; |
130 std::list<AUAudioInputStream*> low_latency_input_streams_; | 130 std::list<AUAudioInputStream*> low_latency_input_streams_; |
131 std::list<AUHALStream*> output_streams_; | 131 std::list<AUHALStream*> output_streams_; |
132 | 132 |
133 DISALLOW_COPY_AND_ASSIGN(AudioManagerMac); | 133 DISALLOW_COPY_AND_ASSIGN(AudioManagerMac); |
134 }; | 134 }; |
135 | 135 |
136 } // namespace media | 136 } // namespace media |
137 | 137 |
138 #endif // MEDIA_AUDIO_MAC_AUDIO_MANAGER_MAC_H_ | 138 #endif // MEDIA_AUDIO_MAC_AUDIO_MANAGER_MAC_H_ |
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