MPD 0.17~git
src/mixer_plugin.h
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00001 /*
00002  * Copyright (C) 2003-2011 The Music Player Daemon Project
00003  * http://www.musicpd.org
00004  *
00005  * This program is free software; you can redistribute it and/or modify
00006  * it under the terms of the GNU General Public License as published by
00007  * the Free Software Foundation; either version 2 of the License, or
00008  * (at your option) any later version.
00009  *
00010  * This program is distributed in the hope that it will be useful,
00011  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00012  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00013  * GNU General Public License for more details.
00014  *
00015  * You should have received a copy of the GNU General Public License along
00016  * with this program; if not, write to the Free Software Foundation, Inc.,
00017  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
00018  */
00019 
00027 #ifndef MPD_MIXER_PLUGIN_H
00028 #define MPD_MIXER_PLUGIN_H
00029 
00030 #include <glib.h>
00031 
00032 #include <stdbool.h>
00033 
00034 struct config_param;
00035 struct mixer;
00036 
00037 struct mixer_plugin {
00048         struct mixer *(*init)(void *ao, const struct config_param *param,
00049                               GError **error_r);
00050 
00054         void (*finish)(struct mixer *data);
00055 
00063         bool (*open)(struct mixer *data, GError **error_r);
00064 
00068         void (*close)(struct mixer *data);
00069 
00078         int (*get_volume)(struct mixer *mixer, GError **error_r);
00079 
00088         bool (*set_volume)(struct mixer *mixer, unsigned volume,
00089                            GError **error_r);
00090 
00096         bool global;
00097 };
00098 
00099 #endif