MPD
mixer_plugin.h
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1 /*
2  * Copyright (C) 2003-2010 The Music Player Daemon Project
3  * http://www.musicpd.org
4  *
5  * This program is free software; you can redistribute it and/or modify
6  * it under the terms of the GNU General Public License as published by
7  * the Free Software Foundation; either version 2 of the License, or
8  * (at your option) any later version.
9  *
10  * This program is distributed in the hope that it will be useful,
11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13  * GNU General Public License for more details.
14  *
15  * You should have received a copy of the GNU General Public License along
16  * with this program; if not, write to the Free Software Foundation, Inc.,
17  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
18  */
19 
27 #ifndef MPD_MIXER_PLUGIN_H
28 #define MPD_MIXER_PLUGIN_H
29 
30 #include <glib.h>
31 
32 #include <stdbool.h>
33 
34 struct config_param;
35 struct mixer;
36 
37 struct mixer_plugin {
48  struct mixer *(*init)(void *ao, const struct config_param *param,
49  GError **error_r);
50 
54  void (*finish)(struct mixer *data);
55 
63  bool (*open)(struct mixer *data, GError **error_r);
64 
68  void (*close)(struct mixer *data);
69 
78  int (*get_volume)(struct mixer *mixer, GError **error_r);
79 
88  bool (*set_volume)(struct mixer *mixer, unsigned volume,
89  GError **error_r);
90 
96  bool global;
97 };
98 
99 #endif