100 lines
2.7 KiB
C
100 lines
2.7 KiB
C
/*
|
|
* Copyright (C) 2003-2011 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.,
|
|
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
|
|
*/
|
|
|
|
/** \file
|
|
*
|
|
* This header declares the mixer_plugin class. It should not be
|
|
* included directly; use mixer_api.h instead in mixer
|
|
* implementations.
|
|
*/
|
|
|
|
#ifndef MPD_MIXER_PLUGIN_H
|
|
#define MPD_MIXER_PLUGIN_H
|
|
|
|
#include "gerror.h"
|
|
|
|
#include <stdbool.h>
|
|
|
|
struct config_param;
|
|
struct mixer;
|
|
|
|
struct mixer_plugin {
|
|
/**
|
|
* Alocates and configures a mixer device.
|
|
*
|
|
* @param ao the pointer returned by audio_output_plugin.init
|
|
* @param param the configuration section, or NULL if there is
|
|
* no configuration
|
|
* @param error_r location to store the error occurring, or
|
|
* NULL to ignore errors
|
|
* @return a mixer object, or NULL on error
|
|
*/
|
|
struct mixer *(*init)(void *ao, const struct config_param *param,
|
|
GError **error_r);
|
|
|
|
/**
|
|
* Finish and free mixer data
|
|
*/
|
|
void (*finish)(struct mixer *data);
|
|
|
|
/**
|
|
* Open mixer device
|
|
*
|
|
* @param error_r location to store the error occurring, or
|
|
* NULL to ignore errors
|
|
* @return true on success, false on error
|
|
*/
|
|
bool (*open)(struct mixer *data, GError **error_r);
|
|
|
|
/**
|
|
* Close mixer device
|
|
*/
|
|
void (*close)(struct mixer *data);
|
|
|
|
/**
|
|
* Reads the current volume.
|
|
*
|
|
* @param error_r location to store the error occurring, or
|
|
* NULL to ignore errors
|
|
* @return the current volume (0..100 including) or -1 if
|
|
* unavailable or on error (error_r set, mixer will be closed)
|
|
*/
|
|
int (*get_volume)(struct mixer *mixer, GError **error_r);
|
|
|
|
/**
|
|
* Sets the volume.
|
|
*
|
|
* @param error_r location to store the error occurring, or
|
|
* NULL to ignore errors
|
|
* @param volume the new volume (0..100 including)
|
|
* @return true on success, false on error
|
|
*/
|
|
bool (*set_volume)(struct mixer *mixer, unsigned volume,
|
|
GError **error_r);
|
|
|
|
/**
|
|
* If true, then the mixer is automatically opened, even if
|
|
* its audio output is not open. If false, then the mixer is
|
|
* disabled as long as its audio output is closed.
|
|
*/
|
|
bool global;
|
|
};
|
|
|
|
#endif
|