1 /*****************************************************************************
2 * variables.h: variables handling
3 *****************************************************************************
4 * Copyright (C) 2002-2004 the VideoLAN team
7 * Authors: Samuel Hocevar <sam@zoy.org>
8 * Gildas Bazin <gbazin@netcourrier.com>
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
23 *****************************************************************************/
25 #if !defined( __LIBVLC__ )
26 #error You are not libvlc or one of its plugins. You cannot include this file
30 * \defgroup variables Variables
32 * Functions for using the object variables in vlc.
34 * Vlc have a very powerful "object variable" infrastructure useful
40 /*****************************************************************************
41 * Variable types - probably very incomplete
42 *****************************************************************************/
43 #define VLC_VAR_TYPE 0x00ff
44 #define VLC_VAR_FLAGS 0xff00
46 /** \defgroup var_flags Additive flags
47 * These flags are added to the type field of the variable. Most as a result of
48 * a __var_Change() call, but some may be added at creation time
51 #define VLC_VAR_HASCHOICE 0x0100
52 #define VLC_VAR_HASMIN 0x0200
53 #define VLC_VAR_HASMAX 0x0400
54 #define VLC_VAR_HASSTEP 0x0800
56 #define VLC_VAR_ISLIST 0x1000
57 #define VLC_VAR_ISCOMMAND 0x2000
58 #define VLC_VAR_ISCONFIG 0x2000
61 #define VLC_VAR_DOINHERIT 0x8000
65 * \defgroup var_action Variable actions
66 * These are the different actions that can be used with __var_Change().
67 * The parameters given are the meaning of the two last parameters of
68 * __var_Change() when this action is being used.
73 * Set the minimum value of this variable
74 * \param p_val The new minimum value
75 * \param p_val2 Unused
77 #define VLC_VAR_SETMIN 0x0010
79 * Set the maximum value of this variable
80 * \param p_val The new maximum value
81 * \param p_val2 Unused
83 #define VLC_VAR_SETMAX 0x0011
84 #define VLC_VAR_SETSTEP 0x0012
87 * Set the value of this variable without triggering any callbacks
88 * \param p_val The new value
89 * \param p_val2 Unused
91 #define VLC_VAR_SETVALUE 0x0013
93 #define VLC_VAR_SETTEXT 0x0014
94 #define VLC_VAR_GETTEXT 0x0015
96 #define VLC_VAR_ADDCHOICE 0x0020
97 #define VLC_VAR_DELCHOICE 0x0021
98 #define VLC_VAR_CLEARCHOICES 0x0022
99 #define VLC_VAR_SETDEFAULT 0x0023
100 #define VLC_VAR_GETCHOICES 0x0024
101 #define VLC_VAR_FREECHOICES 0x0025
102 #define VLC_VAR_GETLIST 0x0026
103 #define VLC_VAR_FREELIST 0x0027
104 #define VLC_VAR_CHOICESCOUNT 0x0028
106 #define VLC_VAR_INHERITVALUE 0x0030
107 #define VLC_VAR_TRIGGER_CALLBACKS 0x0035
110 /*****************************************************************************
112 *****************************************************************************/
113 VLC_EXPORT( int, __var_Create, ( vlc_object_t *, const char *, int ) );
114 VLC_EXPORT( int, __var_Destroy, ( vlc_object_t *, const char * ) );
116 VLC_EXPORT( int, __var_Change, ( vlc_object_t *, const char *, int, vlc_value_t *, vlc_value_t * ) );
118 VLC_EXPORT( int, __var_Type, ( vlc_object_t *, const char * ) );
119 VLC_EXPORT( int, __var_Set, ( vlc_object_t *, const char *, vlc_value_t ) );
120 VLC_EXPORT( int, __var_Get, ( vlc_object_t *, const char *, vlc_value_t * ) );
122 #define var_OptionParse(a,b) __var_OptionParse( VLC_OBJECT( a ) , b )
123 VLC_EXPORT( void, __var_OptionParse, ( vlc_object_t *, const char * ) );
126 * __var_Create() with automatic casting.
128 #define var_Create(a,b,c) __var_Create( VLC_OBJECT(a), b, c )
130 * __var_Destroy() with automatic casting
132 #define var_Destroy(a,b) __var_Destroy( VLC_OBJECT(a), b )
135 * __var_Change() with automatic casting
137 #define var_Change(a,b,c,d,e) __var_Change( VLC_OBJECT(a), b, c, d, e )
140 * __var_Type() with automatic casting
142 #define var_Type(a,b) __var_Type( VLC_OBJECT(a), b )
144 * __var_Set() with automatic casting
146 #define var_Set(a,b,c) __var_Set( VLC_OBJECT(a), b, c )
148 * __var_Get() with automatic casting
150 #define var_Get(a,b,c) __var_Get( VLC_OBJECT(a), b, c )
152 /*****************************************************************************
154 *****************************************************************************
155 * int MyCallback( vlc_object_t *p_this,
156 * char const *psz_variable,
157 * vlc_value_t oldvalue,
158 * vlc_value_t newvalue,
160 *****************************************************************************/
161 VLC_EXPORT( int, __var_AddCallback, ( vlc_object_t *, const char *, vlc_callback_t, void * ) );
162 VLC_EXPORT( int, __var_DelCallback, ( vlc_object_t *, const char *, vlc_callback_t, void * ) );
165 * __var_AddCallback() with automatic casting
167 #define var_AddCallback(a,b,c,d) __var_AddCallback( VLC_OBJECT(a), b, c, d )
170 * __var_DelCallback() with automatic casting
172 #define var_DelCallback(a,b,c,d) __var_DelCallback( VLC_OBJECT(a), b, c, d )
174 /*****************************************************************************
176 *****************************************************************************/
179 * Set the value of an integer variable
181 * \param p_obj The object that holds the variable
182 * \param psz_name The name of the variable
183 * \param i The new integer value of this variable
185 static inline int __var_SetInteger( vlc_object_t *p_obj, const char *psz_name, int i )
189 return __var_Set( p_obj, psz_name, val );
191 #define var_SetInteger(a,b,c) __var_SetInteger( VLC_OBJECT(a),b,c)
193 * Set the value of an boolean variable
195 * \param p_obj The object that holds the variable
196 * \param psz_name The name of the variable
197 * \param b The new boolean value of this variable
199 static inline int __var_SetBool( vlc_object_t *p_obj, const char *psz_name, vlc_bool_t b )
203 return __var_Set( p_obj, psz_name, val );
207 * Set the value of a time variable
209 * \param p_obj The object that holds the variable
210 * \param psz_name The name of the variable
211 * \param i The new time value of this variable
213 static inline int __var_SetTime( vlc_object_t *p_obj, const char *psz_name, int64_t i )
217 return __var_Set( p_obj, psz_name, val );
221 * Set the value of a float variable
223 * \param p_obj The object that holds the variable
224 * \param psz_name The name of the variable
225 * \param f The new float value of this variable
227 static inline int __var_SetFloat( vlc_object_t *p_obj, const char *psz_name, float f )
231 return __var_Set( p_obj, psz_name, val );
235 * Set the value of a string variable
237 * \param p_obj The object that holds the variable
238 * \param psz_name The name of the variable
239 * \param psz_string The new string value of this variable
241 static inline int __var_SetString( vlc_object_t *p_obj, const char *psz_name, const char *psz_string )
244 val.psz_string = (char *)psz_string;
245 return __var_Set( p_obj, psz_name, val );
249 * Trigger the callbacks on a void variable
251 * \param p_obj The object that holds the variable
252 * \param psz_name The name of the variable
254 static inline int __var_SetVoid( vlc_object_t *p_obj, const char *psz_name )
257 val.b_bool = VLC_TRUE;
258 return __var_Set( p_obj, psz_name, val );
260 #define var_SetVoid(a,b) __var_SetVoid( VLC_OBJECT(a),b)
263 * __var_SetBool() with automatic casting
265 #define var_SetBool(a,b,c) __var_SetBool( VLC_OBJECT(a),b,c)
268 * __var_SetTime() with automatic casting
270 #define var_SetTime(a,b,c) __var_SetTime( VLC_OBJECT(a),b,c)
272 * __var_SetFloat() with automatic casting
274 #define var_SetFloat(a,b,c) __var_SetFloat( VLC_OBJECT(a),b,c)
276 * __var_SetString() with automatic casting
278 #define var_SetString(a,b,c) __var_SetString( VLC_OBJECT(a),b,c)
281 * Get an integer value
283 * \param p_obj The object that holds the variable
284 * \param psz_name The name of the variable
286 static inline int __var_GetInteger( vlc_object_t *p_obj, const char *psz_name )
288 vlc_value_t val;val.i_int = 0;
289 if( !__var_Get( p_obj, psz_name, &val ) )
296 * Get a boolean value
298 * \param p_obj The object that holds the variable
299 * \param psz_name The name of the variable
301 static inline int __var_GetBool( vlc_object_t *p_obj, const char *psz_name )
303 vlc_value_t val; val.b_bool = VLC_FALSE;
304 if( !__var_Get( p_obj, psz_name, &val ) )
313 * \param p_obj The object that holds the variable
314 * \param psz_name The name of the variable
316 static inline int64_t __var_GetTime( vlc_object_t *p_obj, const char *psz_name )
318 vlc_value_t val; val.i_time = 0L;
319 if( !__var_Get( p_obj, psz_name, &val ) )
328 * \param p_obj The object that holds the variable
329 * \param psz_name The name of the variable
331 static inline float __var_GetFloat( vlc_object_t *p_obj, const char *psz_name )
333 vlc_value_t val; val.f_float = 0.0;
334 if( !__var_Get( p_obj, psz_name, &val ) )
343 * \param p_obj The object that holds the variable
344 * \param psz_name The name of the variable
346 static inline char *__var_GetString( vlc_object_t *p_obj, const char *psz_name )
348 vlc_value_t val; val.psz_string = NULL;
349 if( !__var_Get( p_obj, psz_name, &val ) )
350 return val.psz_string;
356 * __var_GetInteger() with automatic casting
358 #define var_GetInteger(a,b) __var_GetInteger( VLC_OBJECT(a),b)
360 * __var_GetBool() with automatic casting
362 #define var_GetBool(a,b) __var_GetBool( VLC_OBJECT(a),b)
364 * __var_GetTime() with automatic casting
366 #define var_GetTime(a,b) __var_GetTime( VLC_OBJECT(a),b)
368 * __var_GetFloat() with automatic casting
370 #define var_GetFloat(a,b) __var_GetFloat( VLC_OBJECT(a),b)
372 * __var_GetString() with automatic casting
374 #define var_GetString(a,b) __var_GetString( VLC_OBJECT(a),b)
379 * Increment an integer variable
380 * \param p_obj the object that holds the variable
381 * \param psz_name the name of the variable
383 static inline void __var_IncInteger( vlc_object_t *p_obj, const char *psz_name )
385 int i_val = __var_GetInteger( p_obj, psz_name );
386 __var_SetInteger( p_obj, psz_name, ++i_val );
388 #define var_IncInteger(a,b) __var_IncInteger( VLC_OBJECT(a), b )
391 * Decrement an integer variable
392 * \param p_obj the object that holds the variable
393 * \param psz_name the name of the variable
395 static inline void __var_DecInteger( vlc_object_t *p_obj, const char *psz_name )
397 int i_val = __var_GetInteger( p_obj, psz_name );
398 __var_SetInteger( p_obj, psz_name, --i_val );
400 #define var_DecInteger(a,b) __var_DecInteger( VLC_OBJECT(a), b )
403 * Create a integer variable with inherit and get its value.
405 * \param p_obj The object that holds the variable
406 * \param psz_name The name of the variable
408 static inline int __var_CreateGetInteger( vlc_object_t *p_obj, const char *psz_name )
412 __var_Create( p_obj, psz_name, VLC_VAR_INTEGER | VLC_VAR_DOINHERIT );
413 if( !__var_Get( p_obj, psz_name, &val ) )
420 * Create a boolean variable with inherit and get its value.
422 * \param p_obj The object that holds the variable
423 * \param psz_name The name of the variable
425 static inline int __var_CreateGetBool( vlc_object_t *p_obj, const char *psz_name )
429 __var_Create( p_obj, psz_name, VLC_VAR_BOOL | VLC_VAR_DOINHERIT );
430 if( !__var_Get( p_obj, psz_name, &val ) )
437 * Create a time variable with inherit and get its value.
439 * \param p_obj The object that holds the variable
440 * \param psz_name The name of the variable
442 static inline int64_t __var_CreateGetTime( vlc_object_t *p_obj, const char *psz_name )
446 __var_Create( p_obj, psz_name, VLC_VAR_TIME | VLC_VAR_DOINHERIT );
447 if( !__var_Get( p_obj, psz_name, &val ) )
454 * Create a float variable with inherit and get its value.
456 * \param p_obj The object that holds the variable
457 * \param psz_name The name of the variable
459 static inline float __var_CreateGetFloat( vlc_object_t *p_obj, const char *psz_name )
463 __var_Create( p_obj, psz_name, VLC_VAR_FLOAT | VLC_VAR_DOINHERIT );
464 if( !__var_Get( p_obj, psz_name, &val ) )
471 * Create a string variable with inherit and get its value.
473 * \param p_obj The object that holds the variable
474 * \param psz_name The name of the variable
476 static inline char *__var_CreateGetString( vlc_object_t *p_obj, const char *psz_name )
480 __var_Create( p_obj, psz_name, VLC_VAR_STRING | VLC_VAR_DOINHERIT );
481 if( !__var_Get( p_obj, psz_name, &val ) )
482 return val.psz_string;
488 * __var_CreateGetInteger() with automatic casting
490 #define var_CreateGetInteger(a,b) __var_CreateGetInteger( VLC_OBJECT(a),b)
492 * __var_CreateGetBool() with automatic casting
494 #define var_CreateGetBool(a,b) __var_CreateGetBool( VLC_OBJECT(a),b)
496 * __var_CreateGetTime() with automatic casting
498 #define var_CreateGetTime(a,b) __var_CreateGetTime( VLC_OBJECT(a),b)
500 * __var_CreateGetFloat() with automatic casting
502 #define var_CreateGetFloat(a,b) __var_CreateGetFloat( VLC_OBJECT(a),b)
504 * __var_CreateGetString() with automatic casting
506 #define var_CreateGetString(a,b) __var_CreateGetString( VLC_OBJECT(a),b)