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vlc/include/vlc_variables.h

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/*****************************************************************************
* variables.h: variables handling
*****************************************************************************
* Copyright (C) 2002-2004 the VideoLAN team
* $Id$
*
* Authors: Samuel Hocevar <sam@zoy.org>
* Gildas Bazin <gbazin@netcourrier.com>
*
* 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.
*****************************************************************************/
#ifndef VLC_VARIABLES_H
#define VLC_VARIABLES_H 1
/**
* \file
* This file defines functions and structures for dynamic variables in vlc
*/
/**
* \defgroup variables Variables
*
* Functions for using the object variables in vlc.
*
* Vlc have a very powerful "object variable" infrastructure useful
* for many things.
*
* @{
*/
/*****************************************************************************
* Variable types - probably very incomplete
*****************************************************************************/
#define VLC_VAR_TYPE 0x00ff
#define VLC_VAR_CLASS 0x00f0
#define VLC_VAR_FLAGS 0xff00
/** \defgroup var_flags Additive flags
* These flags are added to the type field of the variable. Most as a result of
* a __var_Change() call, but some may be added at creation time
* @{
*/
#define VLC_VAR_HASCHOICE 0x0100
#define VLC_VAR_HASMIN 0x0200
#define VLC_VAR_HASMAX 0x0400
#define VLC_VAR_HASSTEP 0x0800
#define VLC_VAR_ISCOMMAND 0x2000
/** Creation flag */
/* If the variable is not found on the current module
search all parents and finally module config until found */
#define VLC_VAR_DOINHERIT 0x8000
/**@}*/
/**
* \defgroup var_action Variable actions
* These are the different actions that can be used with __var_Change().
* The parameters given are the meaning of the two last parameters of
* __var_Change() when this action is being used.
* @{
*/
/**
* Set the minimum value of this variable
* \param p_val The new minimum value
* \param p_val2 Unused
*/
#define VLC_VAR_SETMIN 0x0010
/**
* Set the maximum value of this variable
* \param p_val The new maximum value
* \param p_val2 Unused
*/
#define VLC_VAR_SETMAX 0x0011
#define VLC_VAR_SETSTEP 0x0012
/**
* Set the value of this variable without triggering any callbacks
* \param p_val The new value
* \param p_val2 Unused
*/
#define VLC_VAR_SETVALUE 0x0013
#define VLC_VAR_SETTEXT 0x0014
#define VLC_VAR_GETTEXT 0x0015
#define VLC_VAR_GETMIN 0x0016
#define VLC_VAR_GETMAX 0x0017
#define VLC_VAR_GETSTEP 0x0018
#define VLC_VAR_ADDCHOICE 0x0020
#define VLC_VAR_DELCHOICE 0x0021
#define VLC_VAR_CLEARCHOICES 0x0022
#define VLC_VAR_SETDEFAULT 0x0023
#define VLC_VAR_GETCHOICES 0x0024
#define VLC_VAR_FREECHOICES 0x0025
#define VLC_VAR_GETLIST 0x0026
#define VLC_VAR_FREELIST 0x0027
#define VLC_VAR_CHOICESCOUNT 0x0028
#define VLC_VAR_INHERITVALUE 0x0030
#define VLC_VAR_SETISCOMMAND 0x0040
/**@}*/
/*****************************************************************************
* Prototypes
*****************************************************************************/
VLC_EXPORT( int, __var_Create, ( vlc_object_t *, const char *, int ) );
VLC_EXPORT( int, __var_Destroy, ( vlc_object_t *, const char * ) );
VLC_EXPORT( int, __var_Change, ( vlc_object_t *, const char *, int, vlc_value_t *, vlc_value_t * ) );
VLC_EXPORT( int, __var_Type, ( vlc_object_t *, const char * ) LIBVLC_USED );
VLC_EXPORT( int, __var_Set, ( vlc_object_t *, const char *, vlc_value_t ) );
VLC_EXPORT( int, __var_Get, ( vlc_object_t *, const char *, vlc_value_t * ) );
VLC_EXPORT( int, var_SetChecked, ( vlc_object_t *, const char *, int, vlc_value_t ) );
VLC_EXPORT( int, var_GetChecked, ( vlc_object_t *, const char *, int, vlc_value_t * ) );
#define var_Command(a,b,c,d,e) __var_Command( VLC_OBJECT( a ), b, c, d, e )
VLC_EXPORT( int, __var_Command, ( vlc_object_t *, const char *, const char *, const char *, char ** ) );
/**
* __var_Create() with automatic casting.
*/
#define var_Create(a,b,c) __var_Create( VLC_OBJECT(a), b, c )
/**
* __var_Destroy() with automatic casting
*/
#define var_Destroy(a,b) __var_Destroy( VLC_OBJECT(a), b )
/**
* __var_Change() with automatic casting
*/
#define var_Change(a,b,c,d,e) __var_Change( VLC_OBJECT(a), b, c, d, e )
/**
* __var_Type() with automatic casting
*/
#define var_Type(a,b) __var_Type( VLC_OBJECT(a), b )
/**
* __var_Set() with automatic casting
*/
#define var_Set(a,b,c) __var_Set( VLC_OBJECT(a), b, c )
/**
* __var_Get() with automatic casting
*/
#define var_Get(a,b,c) __var_Get( VLC_OBJECT(a), b, c )
/*****************************************************************************
* Variable callbacks
*****************************************************************************
* int MyCallback( vlc_object_t *p_this,
* char const *psz_variable,
* vlc_value_t oldvalue,
* vlc_value_t newvalue,
* void *p_data);
*****************************************************************************/
VLC_EXPORT( int, __var_AddCallback, ( vlc_object_t *, const char *, vlc_callback_t, void * ) );
VLC_EXPORT( int, __var_DelCallback, ( vlc_object_t *, const char *, vlc_callback_t, void * ) );
VLC_EXPORT( int, __var_TriggerCallback, ( vlc_object_t *, const char * ) );
/**
* __var_AddCallback() with automatic casting
*/
#define var_AddCallback(a,b,c,d) __var_AddCallback( VLC_OBJECT(a), b, c, d )
/**
* __var_DelCallback() with automatic casting
*/
#define var_DelCallback(a,b,c,d) __var_DelCallback( VLC_OBJECT(a), b, c, d )
/**
* __var_TriggerCallback() with automatic casting
*/
#define var_TriggerCallback(a,b) __var_TriggerCallback( VLC_OBJECT(a), b )
/*****************************************************************************
* helpers functions
*****************************************************************************/
/**
* Set the value of an integer variable
*
* \param p_obj The object that holds the variable
* \param psz_name The name of the variable
* \param i The new integer value of this variable
*/
static inline int __var_SetInteger( vlc_object_t *p_obj, const char *psz_name, int i )
{
vlc_value_t val;
val.i_int = i;
return var_SetChecked( p_obj, psz_name, VLC_VAR_INTEGER, val );
}
#define var_SetInteger(a,b,c) __var_SetInteger( VLC_OBJECT(a),b,c)
/**
* Set the value of an boolean variable
*
* \param p_obj The object that holds the variable
* \param psz_name The name of the variable
* \param b The new boolean value of this variable
*/
static inline int __var_SetBool( vlc_object_t *p_obj, const char *psz_name, bool b )
{
vlc_value_t val;
val.b_bool = b;
return var_SetChecked( p_obj, psz_name, VLC_VAR_BOOL, val );
}
/**
* Set the value of a time variable
*
* \param p_obj The object that holds the variable
* \param psz_name The name of the variable
* \param i The new time value of this variable
*/
static inline int __var_SetTime( vlc_object_t *p_obj, const char *psz_name, int64_t i )
{
vlc_value_t val;
val.i_time = i;
return var_SetChecked( p_obj, psz_name, VLC_VAR_TIME, val );
}
/**
* Set the value of a float variable
*
* \param p_obj The object that holds the variable
* \param psz_name The name of the variable
* \param f The new float value of this variable
*/
static inline int __var_SetFloat( vlc_object_t *p_obj, const char *psz_name, float f )
{
vlc_value_t val;
val.f_float = f;
return var_SetChecked( p_obj, psz_name, VLC_VAR_FLOAT, val );
}
/**
* Set the value of a string variable
*
* \param p_obj The object that holds the variable
* \param psz_name The name of the variable
* \param psz_string The new string value of this variable
*/
static inline int __var_SetString( vlc_object_t *p_obj, const char *psz_name, const char *psz_string )
{
vlc_value_t val;
val.psz_string = (char *)psz_string;
return var_SetChecked( p_obj, psz_name, VLC_VAR_STRING, val );
}
/**
* Trigger the callbacks on a void variable
*
* \param p_obj The object that holds the variable
* \param psz_name The name of the variable
*/
static inline int __var_SetVoid( vlc_object_t *p_obj, const char *psz_name )
{
vlc_value_t val;
val.b_bool = true;
return var_SetChecked( p_obj, psz_name, VLC_VAR_VOID, val );
}
#define var_SetVoid(a,b) __var_SetVoid( VLC_OBJECT(a),b)
/**
* Set the value of a pointer variable
*
* \param p_obj The object that holds the variable
* \param psz_name The name of the variable
* \param ptr The new pointer value of this variable
*/
static inline
int var_SetAddress( vlc_object_t *p_obj, const char *psz_name, void *ptr )
{
vlc_value_t val;
val.p_address = ptr;
return var_SetChecked( p_obj, psz_name, VLC_VAR_ADDRESS, val );
}
#define var_SetAddress(o, n, p) var_SetAddress(VLC_OBJECT(o), n, p)
/**
* __var_SetBool() with automatic casting
*/
#define var_SetBool(a,b,c) __var_SetBool( VLC_OBJECT(a),b,c)
/**
* __var_SetTime() with automatic casting
*/
#define var_SetTime(a,b,c) __var_SetTime( VLC_OBJECT(a),b,c)
/**
* __var_SetFloat() with automatic casting
*/
#define var_SetFloat(a,b,c) __var_SetFloat( VLC_OBJECT(a),b,c)
/**
* __var_SetString() with automatic casting
*/
#define var_SetString(a,b,c) __var_SetString( VLC_OBJECT(a),b,c)
/**
* Get an integer value
*
* \param p_obj The object that holds the variable
* \param psz_name The name of the variable
*/
LIBVLC_USED
static inline int __var_GetInteger( vlc_object_t *p_obj, const char *psz_name )
{
vlc_value_t val;
if( !var_GetChecked( p_obj, psz_name, VLC_VAR_INTEGER, &val ) )
return val.i_int;
else
return 0;
}
/**
* Get a boolean value
*
* \param p_obj The object that holds the variable
* \param psz_name The name of the variable
*/
LIBVLC_USED
static inline bool __var_GetBool( vlc_object_t *p_obj, const char *psz_name )
{
vlc_value_t val; val.b_bool = false;
if( !var_GetChecked( p_obj, psz_name, VLC_VAR_BOOL, &val ) )
return val.b_bool;
else
return false;
}
/**
* Get a time value
*
* \param p_obj The object that holds the variable
* \param psz_name The name of the variable
*/
LIBVLC_USED
static inline int64_t __var_GetTime( vlc_object_t *p_obj, const char *psz_name )
{
vlc_value_t val; val.i_time = 0L;
if( !var_GetChecked( p_obj, psz_name, VLC_VAR_TIME, &val ) )
return val.i_time;
else
return 0;
}
/**
* Get a float value
*
* \param p_obj The object that holds the variable
* \param psz_name The name of the variable
*/
LIBVLC_USED
static inline float __var_GetFloat( vlc_object_t *p_obj, const char *psz_name )
{
vlc_value_t val; val.f_float = 0.0;
if( !var_GetChecked( p_obj, psz_name, VLC_VAR_FLOAT, &val ) )
return val.f_float;
else
return 0.0;
}
/**
* Get a string value
*
* \param p_obj The object that holds the variable
* \param psz_name The name of the variable
*/
LIBVLC_USED
static inline char *__var_GetString( vlc_object_t *p_obj, const char *psz_name )
{
vlc_value_t val; val.psz_string = NULL;
if( var_GetChecked( p_obj, psz_name, VLC_VAR_STRING, &val ) )
return NULL;
else
return val.psz_string;
}
LIBVLC_USED
static inline char *__var_GetNonEmptyString( vlc_object_t *p_obj, const char *psz_name )
{
vlc_value_t val;
if( var_GetChecked( p_obj, psz_name, VLC_VAR_STRING, &val ) )
return NULL;
if( val.psz_string && *val.psz_string )
return val.psz_string;
free( val.psz_string );
return NULL;
}
/**
* __var_GetInteger() with automatic casting
*/
#define var_GetInteger(a,b) __var_GetInteger( VLC_OBJECT(a),b)
/**
* __var_GetBool() with automatic casting
*/
#define var_GetBool(a,b) __var_GetBool( VLC_OBJECT(a),b)
/**
* __var_GetTime() with automatic casting
*/
#define var_GetTime(a,b) __var_GetTime( VLC_OBJECT(a),b)
/**
* __var_GetFloat() with automatic casting
*/
#define var_GetFloat(a,b) __var_GetFloat( VLC_OBJECT(a),b)
/**
* __var_GetString() with automatic casting
*/
#define var_GetString(a,b) __var_GetString( VLC_OBJECT(a),b)
#define var_GetNonEmptyString(a,b) __var_GetNonEmptyString( VLC_OBJECT(a),b)
/**
* Increment an integer variable
* \param p_obj the object that holds the variable
* \param psz_name the name of the variable
*/
static inline void __var_IncInteger( vlc_object_t *p_obj, const char *psz_name )
{
int i_val = __var_GetInteger( p_obj, psz_name );
__var_SetInteger( p_obj, psz_name, ++i_val );
}
#define var_IncInteger(a,b) __var_IncInteger( VLC_OBJECT(a), b )
/**
* Decrement an integer variable
* \param p_obj the object that holds the variable
* \param psz_name the name of the variable
*/
static inline void __var_DecInteger( vlc_object_t *p_obj, const char *psz_name )
{
int i_val = __var_GetInteger( p_obj, psz_name );
__var_SetInteger( p_obj, psz_name, --i_val );
}
#define var_DecInteger(a,b) __var_DecInteger( VLC_OBJECT(a), b )
/**
* Create a integer variable with inherit and get its value.
*
* \param p_obj The object that holds the variable
* \param psz_name The name of the variable
*/
LIBVLC_USED
static inline int __var_CreateGetInteger( vlc_object_t *p_obj, const char *psz_name )
{
__var_Create( p_obj, psz_name, VLC_VAR_INTEGER | VLC_VAR_DOINHERIT );
return __var_GetInteger( p_obj, psz_name );
}
/**
* Create a boolean variable with inherit and get its value.
*
* \param p_obj The object that holds the variable
* \param psz_name The name of the variable
*/
LIBVLC_USED
static inline bool __var_CreateGetBool( vlc_object_t *p_obj, const char *psz_name )
{
__var_Create( p_obj, psz_name, VLC_VAR_BOOL | VLC_VAR_DOINHERIT );
return __var_GetBool( p_obj, psz_name );
}
/**
* Create a time variable with inherit and get its value.
*
* \param p_obj The object that holds the variable
* \param psz_name The name of the variable
*/
LIBVLC_USED
static inline int64_t __var_CreateGetTime( vlc_object_t *p_obj, const char *psz_name )
{
__var_Create( p_obj, psz_name, VLC_VAR_TIME | VLC_VAR_DOINHERIT );
return __var_GetTime( p_obj, psz_name );
}
/**
* Create a float variable with inherit and get its value.
*
* \param p_obj The object that holds the variable
* \param psz_name The name of the variable
*/
LIBVLC_USED
static inline float __var_CreateGetFloat( vlc_object_t *p_obj, const char *psz_name )
{
__var_Create( p_obj, psz_name, VLC_VAR_FLOAT | VLC_VAR_DOINHERIT );
return __var_GetFloat( p_obj, psz_name );
}
/**
* Create a string variable with inherit and get its value.
*
* \param p_obj The object that holds the variable
* \param psz_name The name of the variable
*/
LIBVLC_USED
static inline char *__var_CreateGetString( vlc_object_t *p_obj,
const char *psz_name )
{
__var_Create( p_obj, psz_name, VLC_VAR_STRING | VLC_VAR_DOINHERIT );
return __var_GetString( p_obj, psz_name );
}
LIBVLC_USED
static inline char *__var_CreateGetNonEmptyString( vlc_object_t *p_obj,
const char *psz_name )
{
__var_Create( p_obj, psz_name, VLC_VAR_STRING | VLC_VAR_DOINHERIT );
return __var_GetNonEmptyString( p_obj, psz_name );
}
/**
* __var_CreateGetInteger() with automatic casting
*/
#define var_CreateGetInteger(a,b) __var_CreateGetInteger( VLC_OBJECT(a),b)
/**
* __var_CreateGetBool() with automatic casting
*/
#define var_CreateGetBool(a,b) __var_CreateGetBool( VLC_OBJECT(a),b)
/**
* __var_CreateGetTime() with automatic casting
*/
#define var_CreateGetTime(a,b) __var_CreateGetTime( VLC_OBJECT(a),b)
/**
* __var_CreateGetFloat() with automatic casting
*/
#define var_CreateGetFloat(a,b) __var_CreateGetFloat( VLC_OBJECT(a),b)
/**
* __var_CreateGetString() with automatic casting
*/
#define var_CreateGetString(a,b) __var_CreateGetString( VLC_OBJECT(a),b)
#define var_CreateGetNonEmptyString(a,b) __var_CreateGetNonEmptyString( VLC_OBJECT(a),b)
/**
* Create a integer command variable with inherit and get its value.
*
* \param p_obj The object that holds the variable
* \param psz_name The name of the variable
*/
LIBVLC_USED
static inline int __var_CreateGetIntegerCommand( vlc_object_t *p_obj, const char *psz_name )
{
__var_Create( p_obj, psz_name, VLC_VAR_INTEGER | VLC_VAR_DOINHERIT
| VLC_VAR_ISCOMMAND );
return __var_GetInteger( p_obj, psz_name );
}
/**
* Create a boolean command variable with inherit and get its value.
*
* \param p_obj The object that holds the variable
* \param psz_name The name of the variable
*/
LIBVLC_USED
static inline bool __var_CreateGetBoolCommand( vlc_object_t *p_obj, const char *psz_name )
{
__var_Create( p_obj, psz_name, VLC_VAR_BOOL | VLC_VAR_DOINHERIT
| VLC_VAR_ISCOMMAND );
return __var_GetBool( p_obj, psz_name );
}
/**
* Create a time command variable with inherit and get its value.
*
* \param p_obj The object that holds the variable
* \param psz_name The name of the variable
*/
LIBVLC_USED
static inline int64_t __var_CreateGetTimeCommand( vlc_object_t *p_obj, const char *psz_name )
{
__var_Create( p_obj, psz_name, VLC_VAR_TIME | VLC_VAR_DOINHERIT
| VLC_VAR_ISCOMMAND );
return __var_GetTime( p_obj, psz_name );
}
/**
* Create a float command variable with inherit and get its value.
*
* \param p_obj The object that holds the variable
* \param psz_name The name of the variable
*/
LIBVLC_USED
static inline float __var_CreateGetFloatCommand( vlc_object_t *p_obj, const char *psz_name )
{
__var_Create( p_obj, psz_name, VLC_VAR_FLOAT | VLC_VAR_DOINHERIT
| VLC_VAR_ISCOMMAND );
return __var_GetFloat( p_obj, psz_name );
}
/**
* Create a string command variable with inherit and get its value.
*
* \param p_obj The object that holds the variable
* \param psz_name The name of the variable
*/
LIBVLC_USED
static inline char *__var_CreateGetStringCommand( vlc_object_t *p_obj,
const char *psz_name )
{
__var_Create( p_obj, psz_name, VLC_VAR_STRING | VLC_VAR_DOINHERIT
| VLC_VAR_ISCOMMAND );
return __var_GetString( p_obj, psz_name );
}
LIBVLC_USED
static inline char *__var_CreateGetNonEmptyStringCommand( vlc_object_t *p_obj,
const char *psz_name )
{
__var_Create( p_obj, psz_name, VLC_VAR_STRING | VLC_VAR_DOINHERIT
| VLC_VAR_ISCOMMAND );
return __var_GetNonEmptyString( p_obj, psz_name );
}
/**
* __var_CreateGetInteger() with automatic casting
*/
#define var_CreateGetIntegerCommand(a,b) __var_CreateGetIntegerCommand( VLC_OBJECT(a),b)
/**
* __var_CreateGetBoolCommand() with automatic casting
*/
#define var_CreateGetBoolCommand(a,b) __var_CreateGetBoolCommand( VLC_OBJECT(a),b)
/**
* __var_CreateGetTimeCommand() with automatic casting
*/
#define var_CreateGetTimeCommand(a,b) __var_CreateGetTimeCommand( VLC_OBJECT(a),b)
/**
* __var_CreateGetFloat() with automatic casting
*/
#define var_CreateGetFloatCommand(a,b) __var_CreateGetFloatCommand( VLC_OBJECT(a),b)
/**
* __var_CreateGetStringCommand() with automatic casting
*/
#define var_CreateGetStringCommand(a,b) __var_CreateGetStringCommand( VLC_OBJECT(a),b)
#define var_CreateGetNonEmptyStringCommand(a,b) __var_CreateGetNonEmptyStringCommand( VLC_OBJECT(a),b)
static inline int __var_CountChoices( vlc_object_t *p_obj, const char *psz_name )
{
vlc_value_t count;
if( __var_Change( p_obj, psz_name, VLC_VAR_CHOICESCOUNT, &count, NULL ) )
return 0;
return count.i_int;
}
/**
* __var_CountChoices() with automatic casting
*/
#define var_CountChoices(a,b) __var_CountChoices( VLC_OBJECT(a),b)
/**
* @}
*/
#endif /* _VLC_VARIABLES_H */
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