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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. |
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39 virtual ~AUAudioOutputStream(); | 39 virtual ~AUAudioOutputStream(); |
40 | 40 |
41 // Implementation of AudioOutputStream. | 41 // Implementation of AudioOutputStream. |
42 virtual bool Open() OVERRIDE; | 42 virtual bool Open() OVERRIDE; |
43 virtual void Close() OVERRIDE; | 43 virtual void Close() OVERRIDE; |
44 virtual void Start(AudioSourceCallback* callback) OVERRIDE; | 44 virtual void Start(AudioSourceCallback* callback) OVERRIDE; |
45 virtual void Stop() OVERRIDE; | 45 virtual void Stop() OVERRIDE; |
46 virtual void SetVolume(double volume) OVERRIDE; | 46 virtual void SetVolume(double volume) OVERRIDE; |
47 virtual void GetVolume(double* volume) OVERRIDE; | 47 virtual void GetVolume(double* volume) OVERRIDE; |
48 | 48 |
49 static double HardwareSampleRate(); | 49 static int HardwareSampleRate(); |
50 | 50 |
51 private: | 51 private: |
52 // DefaultOutputUnit callback. | 52 // DefaultOutputUnit callback. |
53 static OSStatus InputProc(void* user_data, | 53 static OSStatus InputProc(void* user_data, |
54 AudioUnitRenderActionFlags* flags, | 54 AudioUnitRenderActionFlags* flags, |
55 const AudioTimeStamp* time_stamp, | 55 const AudioTimeStamp* time_stamp, |
56 UInt32 bus_number, | 56 UInt32 bus_number, |
57 UInt32 number_of_frames, | 57 UInt32 number_of_frames, |
58 AudioBufferList* io_data); | 58 AudioBufferList* io_data); |
59 | 59 |
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90 // Volume level from 0 to 1. | 90 // Volume level from 0 to 1. |
91 float volume_; | 91 float volume_; |
92 | 92 |
93 // Fixed playout hardware latency in frames. | 93 // Fixed playout hardware latency in frames. |
94 double hardware_latency_frames_; | 94 double hardware_latency_frames_; |
95 | 95 |
96 DISALLOW_COPY_AND_ASSIGN(AUAudioOutputStream); | 96 DISALLOW_COPY_AND_ASSIGN(AUAudioOutputStream); |
97 }; | 97 }; |
98 | 98 |
99 #endif // MEDIA_AUDIO_MAC_AUDIO_LOW_LATENCY_OUTPUT_MAC_H_ | 99 #endif // MEDIA_AUDIO_MAC_AUDIO_LOW_LATENCY_OUTPUT_MAC_H_ |
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