root/src/misc/variables.h

/*****************************************************************************
 * variables.h: object variables typedefs
 *****************************************************************************
 * Copyright (C) 2002-2006 the VideoLAN team
 * $Id$
 *
 * Authors: Samuel Hocevar <sam@zoy.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.
 *****************************************************************************/

#if defined(__PLUGIN__) || defined(__BUILTIN__) || !defined(__LIBVLC__)
# error This header file can only be included from LibVLC.
#endif

#ifndef __LIBVLC_VARIABLES_H
# define __LIBVLC_VARIABLES_H 1

typedef struct callback_entry_t callback_entry_t;

/**
 * The structure describing a variable.
 * \note vlc_value_t is the common union for variable values
 */
struct variable_t
{
    /** The variable's exported value */
    vlc_value_t  val;

    char *       psz_name; /**< The variable unique name */
    uint32_t     i_hash;   /**< (almost) unique hashed value */
    int          i_type;   /**< The type of the variable */

    /** The variable display name, mainly for use by the interfaces */
    char *       psz_text;

    /** A pointer to a comparison function */
    int      ( * pf_cmp ) ( vlc_value_t, vlc_value_t );
    /** A pointer to a duplication function */
    void     ( * pf_dup ) ( vlc_value_t * );
    /** A pointer to a deallocation function */
    void     ( * pf_free ) ( vlc_value_t * );

    /** Creation count: we only destroy the variable if it reaches 0 */
    int          i_usage;

    /** If the variable has min/max/step values */
    vlc_value_t  min, max, step;

    /** Index of the default choice, if the variable is to be chosen in
     * a list */
    int          i_default;
    /** List of choices */
    vlc_list_t   choices;
    /** List of friendly names for the choices */
    vlc_list_t   choices_text;

    /** Set to TRUE if the variable is in a callback */
    bool   b_incallback;

    /** Number of registered callbacks */
    int                i_entries;
    /** Array of registered callbacks */
    callback_entry_t * p_entries;
};
#endif