1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
|
/*
* libjingle
* Copyright 2004--2010, Google Inc.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
* EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef TALK_SOUND_ALSASOUNDSYSTEM_H_
#define TALK_SOUND_ALSASOUNDSYSTEM_H_
#include "talk/sound/alsasymboltable.h"
#include "talk/sound/soundsysteminterface.h"
#include "webrtc/base/constructormagic.h"
namespace cricket {
class AlsaStream;
class AlsaInputStream;
class AlsaOutputStream;
// Sound system implementation for ALSA, the predominant sound device API on
// Linux (but typically not used directly by applications anymore).
class AlsaSoundSystem : public SoundSystemInterface {
friend class AlsaStream;
friend class AlsaInputStream;
friend class AlsaOutputStream;
public:
static SoundSystemInterface *Create() {
return new AlsaSoundSystem();
}
AlsaSoundSystem();
virtual ~AlsaSoundSystem();
virtual bool Init();
virtual void Terminate();
virtual bool EnumeratePlaybackDevices(SoundDeviceLocatorList *devices);
virtual bool EnumerateCaptureDevices(SoundDeviceLocatorList *devices);
virtual bool GetDefaultPlaybackDevice(SoundDeviceLocator **device);
virtual bool GetDefaultCaptureDevice(SoundDeviceLocator **device);
virtual SoundOutputStreamInterface *OpenPlaybackDevice(
const SoundDeviceLocator *device,
const OpenParams ¶ms);
virtual SoundInputStreamInterface *OpenCaptureDevice(
const SoundDeviceLocator *device,
const OpenParams ¶ms);
virtual const char *GetName() const;
private:
bool IsInitialized() { return initialized_; }
bool EnumerateDevices(SoundDeviceLocatorList *devices,
bool capture_not_playback);
bool GetDefaultDevice(SoundDeviceLocator **device);
static size_t FrameSize(const OpenParams ¶ms);
template <typename StreamInterface>
StreamInterface *OpenDevice(
const SoundDeviceLocator *device,
const OpenParams ¶ms,
snd_pcm_stream_t type,
StreamInterface *(AlsaSoundSystem::*start_fn)(
snd_pcm_t *handle,
size_t frame_size,
int wait_timeout_ms,
int flags,
int freq));
SoundOutputStreamInterface *StartOutputStream(
snd_pcm_t *handle,
size_t frame_size,
int wait_timeout_ms,
int flags,
int freq);
SoundInputStreamInterface *StartInputStream(
snd_pcm_t *handle,
size_t frame_size,
int wait_timeout_ms,
int flags,
int freq);
const char *GetError(int err);
bool initialized_;
AlsaSymbolTable symbol_table_;
DISALLOW_COPY_AND_ASSIGN(AlsaSoundSystem);
};
} // namespace cricket
#endif // TALK_SOUND_ALSASOUNDSYSTEM_H_
|