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1 // Copyright (c) 2011 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 #ifndef MEDIA_AUDIO_LINUX_PULSE_OUTPUT_H_ | |
6 #define MEDIA_AUDIO_LINUX_PULSE_OUTPUT_H_ | |
7 | |
8 #include <pulse/pulseaudio.h> | |
9 | |
10 #include <string> | |
11 | |
12 #include "base/message_loop.h" | |
13 #include "base/memory/scoped_ptr.h" | |
14 #include "media/audio/audio_io.h" | |
15 #include "media/audio/audio_parameters.h" | |
16 | |
17 namespace media { | |
18 class SeekableBuffer; | |
19 } | |
20 | |
21 class AudioManagerLinux; | |
22 | |
23 class PulseAudioOutputStream : public AudioOutputStream { | |
vrk (LEFT CHROMIUM)
2011/08/12 23:16:51
Comment on what this class does.
Things to includ
slock
2011/08/15 20:35:06
Done.
| |
24 public: | |
25 PulseAudioOutputStream(const AudioParameters& params, | |
26 AudioManagerLinux* manager, | |
27 MessageLoop* message_loop); | |
28 | |
29 virtual ~PulseAudioOutputStream(); | |
30 | |
31 // Implementation of AudioOutputStream. | |
32 virtual bool Open(); | |
33 virtual void Close(); | |
34 virtual void Start(AudioSourceCallback* callback); | |
35 virtual void Stop(); | |
36 virtual void SetVolume(double volume); | |
37 virtual void GetVolume(double* volume); | |
38 | |
39 private: | |
40 // PulseAudio mainloop iteration loop task function; used to avoid blocking | |
41 // the audio thread. | |
42 void MainloopIterateTask(); | |
43 | |
44 // PulseAudio Callbacks. | |
45 static void ContextStateCallback(pa_context* context, void* userdata); | |
46 static void WriteCallback(pa_stream* stream, size_t length, void* userdata); | |
47 | |
48 // Function to get another packet from the data source and write it into the | |
49 // client buffer. | |
50 void BufferPacketInClient(); | |
51 | |
52 // API for Proxying calls to the AudioSourceCallback provided during Start(). | |
53 uint32 RunDataCallback(uint8* dest, uint32 max_size, | |
54 AudioBuffersState buffers_state); | |
55 | |
56 // Configuration constants from the constructor. Referencable by all threads | |
57 // since they are constants. | |
58 const ChannelLayout channel_layout_; | |
59 const pa_sample_format_t sample_format_; | |
60 const uint32 sample_rate_; | |
61 const uint32 bytes_per_frame_; | |
62 | |
63 // Device configuration data. Populated after OpenTask() completes. | |
64 uint32 packet_size_; | |
65 uint32 frames_per_packet_; | |
66 | |
67 // Flag indicating the code should stop reading from the data source or | |
68 // writing to the PulseAudio server. This is set because the device has | |
69 // entered an unrecoverable error state, or the Close() has executed. | |
70 bool stream_stopped_; | |
71 | |
72 // Audio manager that created us. Used to report that we've closed. | |
73 AudioManagerLinux* manager_; | |
74 | |
75 // PulseAudio API structs. | |
76 pa_context* pa_context_; | |
77 pa_mainloop* pa_mainloop_; | |
78 pa_mainloop_api* pa_mainloop_api_; // Owned by pa_mainloop_. | |
79 | |
80 // PulseAudio attribute and specification structs. | |
81 pa_sample_spec pa_sample_specs_; | |
82 pa_buffer_attr pa_buffer_attributes_; | |
83 | |
84 // Handle to the actual PulseAudio playback stream. | |
85 pa_stream* playback_handle_; | |
86 | |
87 // Whether or not PulseAudio has called the WriteCallback for the most recent | |
88 // set of pa_mainloop iterations. | |
89 bool pa_write_has_calledback_; | |
90 | |
91 // Internal buffer. | |
92 scoped_ptr<media::SeekableBuffer> client_buffer_; | |
93 bool source_exhausted_; | |
vrk (LEFT CHROMIUM)
2011/08/12 23:16:51
nit: comment this field and ones below (don't forg
slock
2011/08/15 20:35:06
Done.
| |
94 | |
95 float volume_; | |
96 | |
97 AudioSourceCallback* source_callback_; | |
98 | |
99 MessageLoop* message_loop_; | |
100 | |
101 ScopedRunnableMethodFactory<PulseAudioOutputStream> method_factory_; | |
102 | |
103 DISALLOW_COPY_AND_ASSIGN(PulseAudioOutputStream); | |
104 }; | |
105 | |
106 #endif // MEDIA_AUDIO_LINUX_PULSE_OUTPUT_H_ | |
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