blob: c11ee1d124a52d72fbf3a9edd247f0fa606949c0 (
plain)
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
|
// SPDX-License-Identifier: GPL-2.0
/*
* ALSA Virtual Soundcard
*
* core.h - System-level header for virtual ALSA card
*
* Copyright (C) 2010-2018 Fiberdyne Systems Pty Ltd
*/
#ifndef __AVIRT_CORE_H__
#define __AVIRT_CORE_H__
#include <sound/pcm.h>
#include <linux/configfs.h>
#define MAX_NAME_LEN 32
/**
* PCM buffer complete callback
*
* These are called from the audiopath when a PCM buffer has completed, and
* new data can be submitted/retrieved
*/
typedef int (*avirt_buff_complete)(struct snd_pcm_substream *substream);
/**
* AVIRT Audio Path info
*/
struct avirt_audiopath {
const char *uid; /* Unique identifier */
const char *name; /* Pretty name */
unsigned int version[3]; /* Version - Major.Minor.Ext */
struct snd_pcm_hardware *hw; /* ALSA PCM HW conf */
struct snd_pcm_ops *pcm_ops; /* ALSA PCM op table */
unsigned int blocksize; /* Audio frame size accepted */
void *context;
};
/*
* Audio stream configuration
*/
struct avirt_stream {
struct snd_pcm *pcm; /* Stream PCM device */
unsigned int channels; /* Stream channel count */
struct config_item item; /* configfs item reference */
};
/**
* Collection of audio streams
*/
struct avirt_stream_group {
struct avirt_stream *streams; /* AVIRT stream array */
unsigned int devices; /* Number of stream devices */
};
/**
* AVIRT core info
*/
struct avirt_coreinfo {
unsigned int version[3];
struct avirt_stream_group playback;
struct avirt_stream_group capture;
avirt_buff_complete pcm_buff_complete;
};
/**
* avirt_audiopath_register - register Audio Path with ALSA virtual driver
* @audiopath: Audio Path to be registered
* @core: ALSA virtual driver core info
* @return: 0 on success or error code otherwise
*/
int avirt_audiopath_register(struct avirt_audiopath *audiopath,
struct avirt_coreinfo **coreinfo);
/**
* avirt_audiopath_deregister - deregister Audio Path with ALSA virtual driver
* @audiopath: Audio Path to be deregistered
* @return: 0 on success or error code otherwise
*/
int avirt_audiopath_deregister(struct avirt_audiopath *audiopath);
/**
* avirt_audiopath_get - retrieves the Audio Path by it's UID
* @uid: Unique ID for the Audio Path
* @return: Corresponding Audio Path
*/
struct avirt_audiopath *avirt_audiopath_get(const char *uid);
/**
* avirt_subscribe_stream - subscribe the Audio Path to the given streams
* @audiopath: Audio Path to subscribe for
* @streams: The streams to subscribe the Audio Path to
* return: 0 on success or error code otherwise
*/
int avirt_subscribe_stream(struct avirt_audiopath *audiopath,
const char **streams);
#endif // __AVIRT_CORE_H__
|
