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
|
/*
* Copyright (C) 2003-2009 The Music Player Daemon Project
* http://www.musicpd.org
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#ifndef MPD_MIXER_H
#define MPD_MIXER_H
#include "conf.h"
/*
* list of currently implemented mixers
*/
extern const struct mixer_plugin alsa_mixer;
extern const struct mixer_plugin oss_mixer;
struct mixer_data;
struct mixer_plugin {
/**
* Allocate and initialize mixer data
*/
struct mixer_data *(*init)(void);
/**
* Finish and free mixer data
*/
void (*finish)(struct mixer_data *data);
/**
* Setup and configure mixer
*/
void (*configure)(struct mixer_data *data,
const struct config_param *param);
/**
* Open mixer device
*/
bool (*open)(struct mixer_data *data);
/**
* Control mixer device.
*/
bool (*control)(struct mixer_data *data, int cmd, void *arg);
/**
* Close mixer device
*/
void (*close)(struct mixer_data *data);
};
struct mixer {
const struct mixer_plugin *plugin;
struct mixer_data *data;
};
void mixer_init(struct mixer *mixer, const struct mixer_plugin *plugin);
void mixer_finish(struct mixer *mixer);
void mixer_configure(struct mixer *mixer, const struct config_param *param);
bool mixer_open(struct mixer *mixer);
bool mixer_control(struct mixer *mixer, int cmd, void *arg);
void mixer_close(struct mixer *mixer);
#endif
|
