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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/memory/scoped_ptr.h" | |
13 #include "media/audio/audio_io.h" | |
14 #include "media/audio/audio_parameters.h" | |
15 | |
16 namespace media { | |
17 class SeekableBuffer; | |
18 } | |
19 | |
20 class AudioManagerLinux; | |
21 | |
22 class PulseAudioOutputStream : public AudioOutputStream { | |
23 public: | |
24 PulseAudioOutputStream(const AudioParameters& params, | |
25 AudioManagerLinux* manager); | |
26 | |
27 virtual ~PulseAudioOutputStream(); | |
28 | |
29 // Implementation of AudioOutputStream. | |
30 virtual bool Open(); | |
31 virtual void Close(); | |
32 virtual void Start(AudioSourceCallback* callback); | |
33 virtual void Stop(); | |
34 virtual void SetVolume(double volume); | |
35 virtual void GetVolume(double* volume); | |
36 | |
37 private: | |
38 // PulseAudio Callbacks. | |
39 static void ContextStateCallback(pa_context* context, void* userdata); | |
40 static void WriteCallback(pa_stream* stream, size_t length, void* userdata); | |
41 | |
42 // Functions to get another packet from the data source and write it into the | |
43 // PulseAudio device. | |
44 void ClientBufferLoop(); | |
45 void BufferPacketInClient(); | |
46 | |
47 // API for Proxying calls to the AudioSourceCallback provided during Start(). | |
48 uint32 RunDataCallback(uint8* dest, | |
vrk (LEFT CHROMIUM)
2011/08/10 16:34:51
Can these parameters fit on one line?
slock
2011/08/10 22:41:04
Done. Well two of them can anyway.
| |
49 uint32 max_size, | |
50 AudioBuffersState buffers_state); | |
51 | |
52 // Configuration constants from the constructor. Referencable by all threads | |
53 // since they are constants. | |
54 const ChannelLayout channel_layout_; | |
55 const pa_sample_format_t sample_format_; | |
56 const uint32 sample_rate_; | |
57 const uint32 bytes_per_frame_; | |
58 | |
59 // Device configuration data. Populated after OpenTask() completes. | |
60 uint32 packet_size_; | |
61 uint32 frames_per_packet_; | |
62 | |
63 // Flag indicating the code should stop reading from the data source or | |
64 // writing to the PulseAudio server. This is set because the device has | |
65 // entered an unrecoverable error state, or the Close() has executed. | |
66 bool stream_stopped_; | |
67 | |
68 // Audio manager that created us. Used to report that we've closed. | |
69 AudioManagerLinux* manager_; | |
70 | |
71 // PulseAudio API structs. | |
72 pa_mainloop* pa_mainloop_; | |
73 pa_mainloop_api* pa_mainloop_api_; | |
74 pa_context* pa_context_; | |
75 | |
76 // PulseAudio attribute and specification structs. | |
77 pa_sample_spec pa_sample_specs_; | |
78 pa_buffer_attr pa_buffer_attributes_; | |
79 pa_cvolume pa_volume_; | |
80 | |
81 // Handle to the actual PulseAudio playback stream. | |
82 pa_stream* playback_handle_; | |
83 | |
84 // Internal buffer. | |
85 scoped_ptr<media::SeekableBuffer> client_buffer_; | |
86 bool source_exhausted_; | |
87 | |
88 AudioSourceCallback* source_callback_; | |
89 | |
90 DISALLOW_COPY_AND_ASSIGN(PulseAudioOutputStream); | |
91 }; | |
92 | |
93 #endif // MEDIA_AUDIO_LINUX_PULSE_OUTPUT_H_ | |
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