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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 | |
3 // found in the LICENSE file. | |
4 // | |
5 // Notes: | |
6 // It's required to first get the native sample-rate of the default | |
scherkus (not reviewing)
2012/09/10 11:26:19
can we merge this into the class docs?
Chris Rogers
2012/09/10 22:19:06
Done.
| |
7 // output device and then use the same rate when creating this object. | |
8 // | |
9 | |
10 #ifndef MEDIA_AUDIO_MAC_AUDIO_UNIFIED_MAC_H_ | |
11 #define MEDIA_AUDIO_MAC_AUDIO_UNIFIED_MAC_H_ | |
12 | |
13 #include <AudioUnit/AudioUnit.h> | |
14 | |
15 #include "base/memory/scoped_ptr.h" | |
16 #include "media/audio/audio_io.h" | |
17 #include "media/audio/audio_parameters.h" | |
18 | |
19 namespace media { | |
20 | |
21 class AudioManagerMac; | |
22 | |
23 // Implementation of AudioOuputStream for Mac OS X using the | |
24 // CoreAudio AudioHardware API suitable for low-latency synchronized audio I/O | |
25 // when using devices which support *both* input and output | |
26 // in the same driver. This is the case with professional | |
27 // USB and Firewire devices. | |
28 class AudioHardwareUnifiedStream : public AudioOutputStream { | |
29 public: | |
30 // The ctor takes all the usual parameters, plus |manager| which is the | |
31 // the audio manager who is creating this object. | |
32 AudioHardwareUnifiedStream(AudioManagerMac* manager, | |
33 const AudioParameters& params); | |
34 // The dtor is typically called by the AudioManager only and it is usually | |
35 // triggered by calling AudioOutputStream::Close(). | |
36 virtual ~AudioHardwareUnifiedStream(); | |
37 | |
38 // Implementation of AudioOutputStream. | |
39 virtual bool Open() OVERRIDE; | |
40 virtual void Close() OVERRIDE; | |
41 virtual void Start(AudioSourceCallback* callback) OVERRIDE; | |
42 virtual void Stop() OVERRIDE; | |
43 virtual void SetVolume(double volume) OVERRIDE; | |
44 virtual void GetVolume(double* volume) OVERRIDE; | |
45 | |
46 unsigned input_channels() const { return input_channels_; } | |
scherkus (not reviewing)
2012/09/10 11:26:19
s/unsigned/int/ here and everywhere else
Rest of
Chris Rogers
2012/09/10 22:19:06
Done.
| |
47 unsigned output_channels() const { return output_channels_; } | |
48 | |
49 private: | |
50 OSStatus Render(AudioDeviceID inDevice, | |
scherkus (not reviewing)
2012/09/10 11:26:19
unix_hacker style for all parmas
Chris Rogers
2012/09/10 22:19:06
Done.
| |
51 const AudioTimeStamp* inNow, | |
52 const AudioBufferList* inInputData, | |
53 const AudioTimeStamp* inInputTime, | |
54 AudioBufferList* outOutputData, | |
55 const AudioTimeStamp* inOutputTime); | |
56 | |
57 static OSStatus RenderProc(AudioDeviceID inDevice, | |
scherkus (not reviewing)
2012/09/10 11:26:19
unix_hacker style
Chris Rogers
2012/09/10 22:19:06
Done.
| |
58 const AudioTimeStamp* inNow, | |
59 const AudioBufferList* inInputData, | |
60 const AudioTimeStamp* inInputTime, | |
61 AudioBufferList* outOutputData, | |
62 const AudioTimeStamp* inOutputTime, | |
63 void* user_data); | |
64 | |
65 // Our creator, the audio manager needs to be notified when we close. | |
66 AudioManagerMac* manager_; | |
67 | |
68 // Pointer to the object that will provide the audio samples. | |
69 AudioSourceCallback* source_; | |
70 | |
71 // Structure that holds the stream format details such as bitrate. | |
72 AudioStreamBasicDescription format_; | |
73 | |
74 // Hardware buffer size. | |
75 size_t number_of_frames_; | |
76 | |
77 // Number of audio channels provided to the client via OnMoreIOData(). | |
78 unsigned client_input_channels_; | |
scherkus (not reviewing)
2012/09/10 11:26:19
s/unsigned/int/ here and below
Chris Rogers
2012/09/10 22:19:06
Done.
| |
79 | |
80 // Volume level from 0 to 1. | |
81 float volume_; | |
82 | |
83 // Number of input and output channels queried from the hardware. | |
84 unsigned input_channels_; | |
no longer working on chromium
2012/09/10 12:14:59
I know they are the same, but how about using unsi
Chris Rogers
2012/09/10 22:19:06
I switched to "int" according to Andrew's comments
| |
85 unsigned output_channels_; | |
86 unsigned input_channels_per_frame_; | |
87 unsigned output_channels_per_frame_; | |
88 | |
89 AudioDeviceIOProcID io_proc_id_; | |
90 AudioDeviceID device_; | |
91 bool is_playing_; | |
92 | |
93 // Intermediate buffers used with call to OnMoreIOData(). | |
94 scoped_ptr<AudioBus> input_bus_; | |
95 scoped_ptr<AudioBus> output_bus_; | |
96 | |
97 DISALLOW_COPY_AND_ASSIGN(AudioHardwareUnifiedStream); | |
98 }; | |
99 | |
100 } // namespace media | |
101 | |
102 #endif // MEDIA_AUDIO_MAC_AUDIO_UNIFIED_MAC_H_ | |
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