74 lines
1.7 KiB
C
74 lines
1.7 KiB
C
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/*
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* Copyright (C) 2003-2009 The Music Player Daemon Project
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* http://www.musicpd.org
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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/** \file
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*
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* This header declares the mixer_plugin class. It should not be
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* included directly; use mixer_api.h instead in mixer
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* implementations.
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*/
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#ifndef MPD_MIXER_PLUGIN_H
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#define MPD_MIXER_PLUGIN_H
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#include <stdbool.h>
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struct config_param;
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struct mixer;
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struct mixer_plugin {
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/**
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* Alocates and configures a mixer device.
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*/
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struct mixer *(*init)(const struct config_param *param);
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/**
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* Finish and free mixer data
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*/
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void (*finish)(struct mixer *data);
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/**
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* Open mixer device
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*/
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bool (*open)(struct mixer *data);
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/**
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* Close mixer device
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*/
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void (*close)(struct mixer *data);
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/**
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* Reads the current volume.
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*
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* @return the current volume (0..100 including) or -1 on
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* error
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*/
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int (*get_volume)(struct mixer *mixer);
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/**
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* Sets the volume.
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*
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* @param volume the new volume (0..100 including)
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* @return true on success
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*/
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bool (*set_volume)(struct mixer *mixer, unsigned volume);
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};
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#endif
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