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
60 #define VLC_VAR_DOINHERIT 0x8000
64 * \defgroup var_action Variable actions
65 * These are the different actions that can be used with __var_Change().
66 * The parameters given are the meaning of the two last parameters of
67 * __var_Change() when this action is being used.
72 * Set the minimum value of this variable
73 * \param p_val The new minimum value
74 * \param p_val2 Unused
76 #define VLC_VAR_SETMIN 0x0010
78 * Set the maximum value of this variable
79 * \param p_val The new maximum value
80 * \param p_val2 Unused
82 #define VLC_VAR_SETMAX 0x0011
83 #define VLC_VAR_SETSTEP 0x0012
86 * Set the value of this variable without triggering any callbacks
87 * \param p_val The new value
88 * \param p_val2 Unused
90 #define VLC_VAR_SETVALUE 0x0013
92 #define VLC_VAR_SETTEXT 0x0014
93 #define VLC_VAR_GETTEXT 0x0015
95 #define VLC_VAR_ADDCHOICE 0x0020
96 #define VLC_VAR_DELCHOICE 0x0021
97 #define VLC_VAR_CLEARCHOICES 0x0022
98 #define VLC_VAR_SETDEFAULT 0x0023
99 #define VLC_VAR_GETCHOICES 0x0024
100 #define VLC_VAR_FREECHOICES 0x0025
101 #define VLC_VAR_GETLIST 0x0026
102 #define VLC_VAR_FREELIST 0x0027
103 #define VLC_VAR_CHOICESCOUNT 0x0028
105 #define VLC_VAR_INHERITVALUE 0x0030
106 #define VLC_VAR_TRIGGER_CALLBACKS 0x0035
109 /*****************************************************************************
111 *****************************************************************************/
112 VLC_EXPORT( int, __var_Create, ( vlc_object_t *, const char *, int ) );
113 VLC_EXPORT( int, __var_Destroy, ( vlc_object_t *, const char * ) );
115 VLC_EXPORT( int, __var_Change, ( vlc_object_t *, const char *, int, vlc_value_t *, vlc_value_t * ) );
117 VLC_EXPORT( int, __var_Type, ( vlc_object_t *, const char * ) );
118 VLC_EXPORT( int, __var_Set, ( vlc_object_t *, const char *, vlc_value_t ) );
119 VLC_EXPORT( int, __var_Get, ( vlc_object_t *, const char *, vlc_value_t * ) );
121 #define var_OptionParse(a,b) __var_OptionParse( VLC_OBJECT( a ) , b )
122 VLC_EXPORT( void, __var_OptionParse, ( vlc_object_t *, const char * ) );
125 * __var_Create() with automatic casting.
127 #define var_Create(a,b,c) __var_Create( VLC_OBJECT(a), b, c )
129 * __var_Destroy() with automatic casting
131 #define var_Destroy(a,b) __var_Destroy( VLC_OBJECT(a), b )
134 * __var_Change() with automatic casting
136 #define var_Change(a,b,c,d,e) __var_Change( VLC_OBJECT(a), b, c, d, e )
139 * __var_Type() with automatic casting
141 #define var_Type(a,b) __var_Type( VLC_OBJECT(a), b )
143 * __var_Set() with automatic casting
145 #define var_Set(a,b,c) __var_Set( VLC_OBJECT(a), b, c )
147 * __var_Get() with automatic casting
149 #define var_Get(a,b,c) __var_Get( VLC_OBJECT(a), b, c )
151 /*****************************************************************************
153 *****************************************************************************
154 * int MyCallback( vlc_object_t *p_this,
155 * char const *psz_variable,
156 * vlc_value_t oldvalue,
157 * vlc_value_t newvalue,
159 *****************************************************************************/
160 VLC_EXPORT( int, __var_AddCallback, ( vlc_object_t *, const char *, vlc_callback_t, void * ) );
161 VLC_EXPORT( int, __var_DelCallback, ( vlc_object_t *, const char *, vlc_callback_t, void * ) );
164 * __var_AddCallback() with automatic casting
166 #define var_AddCallback(a,b,c,d) __var_AddCallback( VLC_OBJECT(a), b, c, d )
169 * __var_DelCallback() with automatic casting
171 #define var_DelCallback(a,b,c,d) __var_DelCallback( VLC_OBJECT(a), b, c, d )
173 /*****************************************************************************
175 *****************************************************************************/
178 * Set the value of an integer variable
180 * \param p_obj The object that holds the variable
181 * \param psz_name The name of the variable
182 * \param i The new integer value of this variable
184 static inline int __var_SetInteger( vlc_object_t *p_obj, const char *psz_name, int i )
188 return __var_Set( p_obj, psz_name, val );
190 #define var_SetInteger(a,b,c) __var_SetInteger( VLC_OBJECT(a),b,c)
192 * Set the value of an boolean variable
194 * \param p_obj The object that holds the variable
195 * \param psz_name The name of the variable
196 * \param b The new boolean value of this variable
198 static inline int __var_SetBool( vlc_object_t *p_obj, const char *psz_name, vlc_bool_t b )
202 return __var_Set( p_obj, psz_name, val );
206 * Set the value of a time variable
208 * \param p_obj The object that holds the variable
209 * \param psz_name The name of the variable
210 * \param i The new time value of this variable
212 static inline int __var_SetTime( vlc_object_t *p_obj, const char *psz_name, int64_t i )
216 return __var_Set( p_obj, psz_name, val );
220 * Set the value of a float variable
222 * \param p_obj The object that holds the variable
223 * \param psz_name The name of the variable
224 * \param f The new float value of this variable
226 static inline int __var_SetFloat( vlc_object_t *p_obj, const char *psz_name, float f )
230 return __var_Set( p_obj, psz_name, val );
234 * Set the value of a string variable
236 * \param p_obj The object that holds the variable
237 * \param psz_name The name of the variable
238 * \param psz_string The new string value of this variable
240 static inline int __var_SetString( vlc_object_t *p_obj, const char *psz_name, const char *psz_string )
243 val.psz_string = (char *)psz_string;
244 return __var_Set( p_obj, psz_name, val );
248 * Trigger the callbacks on a void variable
250 * \param p_obj The object that holds the variable
251 * \param psz_name The name of the variable
253 static inline int __var_SetVoid( vlc_object_t *p_obj, const char *psz_name )
256 val.b_bool = VLC_TRUE;
257 return __var_Set( p_obj, psz_name, val );
259 #define var_SetVoid(a,b) __var_SetVoid( VLC_OBJECT(a),b)
262 * __var_SetBool() with automatic casting
264 #define var_SetBool(a,b,c) __var_SetBool( VLC_OBJECT(a),b,c)
267 * __var_SetTime() with automatic casting
269 #define var_SetTime(a,b,c) __var_SetTime( VLC_OBJECT(a),b,c)
271 * __var_SetFloat() with automatic casting
273 #define var_SetFloat(a,b,c) __var_SetFloat( VLC_OBJECT(a),b,c)
275 * __var_SetString() with automatic casting
277 #define var_SetString(a,b,c) __var_SetString( VLC_OBJECT(a),b,c)
280 * Get an integer value
282 * \param p_obj The object that holds the variable
283 * \param psz_name The name of the variable
285 static inline int __var_GetInteger( vlc_object_t *p_obj, const char *psz_name )
287 vlc_value_t val;val.i_int = 0;
288 if( !__var_Get( p_obj, psz_name, &val ) )
295 * Get a boolean value
297 * \param p_obj The object that holds the variable
298 * \param psz_name The name of the variable
300 static inline int __var_GetBool( vlc_object_t *p_obj, const char *psz_name )
302 vlc_value_t val; val.b_bool = VLC_FALSE;
303 if( !__var_Get( p_obj, psz_name, &val ) )
312 * \param p_obj The object that holds the variable
313 * \param psz_name The name of the variable
315 static inline int64_t __var_GetTime( vlc_object_t *p_obj, const char *psz_name )
317 vlc_value_t val; val.i_time = 0L;
318 if( !__var_Get( p_obj, psz_name, &val ) )
327 * \param p_obj The object that holds the variable
328 * \param psz_name The name of the variable
330 static inline float __var_GetFloat( vlc_object_t *p_obj, const char *psz_name )
332 vlc_value_t val; val.f_float = 0.0;
333 if( !__var_Get( p_obj, psz_name, &val ) )
342 * \param p_obj The object that holds the variable
343 * \param psz_name The name of the variable
345 static inline char *__var_GetString( vlc_object_t *p_obj, const char *psz_name )
347 vlc_value_t val; val.psz_string = NULL;
348 if( !__var_Get( p_obj, psz_name, &val ) )
349 return val.psz_string;
355 * __var_GetInteger() with automatic casting
357 #define var_GetInteger(a,b) __var_GetInteger( VLC_OBJECT(a),b)
359 * __var_GetBool() with automatic casting
361 #define var_GetBool(a,b) __var_GetBool( VLC_OBJECT(a),b)
363 * __var_GetTime() with automatic casting
365 #define var_GetTime(a,b) __var_GetTime( VLC_OBJECT(a),b)
367 * __var_GetFloat() with automatic casting
369 #define var_GetFloat(a,b) __var_GetFloat( VLC_OBJECT(a),b)
371 * __var_GetString() with automatic casting
373 #define var_GetString(a,b) __var_GetString( VLC_OBJECT(a),b)
378 * Increment an integer variable
379 * \param p_obj the object that holds the variable
380 * \param psz_name the name of the variable
382 static inline void __var_IncInteger( vlc_object_t *p_obj, const char *psz_name )
384 int i_val = __var_GetInteger( p_obj, psz_name );
385 __var_SetInteger( p_obj, psz_name, ++i_val );
387 #define var_IncInteger(a,b) __var_IncInteger( VLC_OBJECT(a), b )
390 * Decrement an integer variable
391 * \param p_obj the object that holds the variable
392 * \param psz_name the name of the variable
394 static inline void __var_DecInteger( vlc_object_t *p_obj, const char *psz_name )
396 int i_val = __var_GetInteger( p_obj, psz_name );
397 __var_SetInteger( p_obj, psz_name, --i_val );
399 #define var_DecInteger(a,b) __var_DecInteger( VLC_OBJECT(a), b )
402 * Create a integer variable with inherit and get its value.
404 * \param p_obj The object that holds the variable
405 * \param psz_name The name of the variable
407 static inline int __var_CreateGetInteger( vlc_object_t *p_obj, const char *psz_name )
411 __var_Create( p_obj, psz_name, VLC_VAR_INTEGER | VLC_VAR_DOINHERIT );
412 if( !__var_Get( p_obj, psz_name, &val ) )
419 * Create a boolean variable with inherit and get its value.
421 * \param p_obj The object that holds the variable
422 * \param psz_name The name of the variable
424 static inline int __var_CreateGetBool( vlc_object_t *p_obj, const char *psz_name )
428 __var_Create( p_obj, psz_name, VLC_VAR_BOOL | VLC_VAR_DOINHERIT );
429 if( !__var_Get( p_obj, psz_name, &val ) )
436 * Create a time variable with inherit and get its value.
438 * \param p_obj The object that holds the variable
439 * \param psz_name The name of the variable
441 static inline int64_t __var_CreateGetTime( vlc_object_t *p_obj, const char *psz_name )
445 __var_Create( p_obj, psz_name, VLC_VAR_TIME | VLC_VAR_DOINHERIT );
446 if( !__var_Get( p_obj, psz_name, &val ) )
453 * Create a float variable with inherit and get its value.
455 * \param p_obj The object that holds the variable
456 * \param psz_name The name of the variable
458 static inline float __var_CreateGetFloat( vlc_object_t *p_obj, const char *psz_name )
462 __var_Create( p_obj, psz_name, VLC_VAR_FLOAT | VLC_VAR_DOINHERIT );
463 if( !__var_Get( p_obj, psz_name, &val ) )
470 * Create a string variable with inherit and get its value.
472 * \param p_obj The object that holds the variable
473 * \param psz_name The name of the variable
475 static inline char *__var_CreateGetString( vlc_object_t *p_obj, const char *psz_name )
479 __var_Create( p_obj, psz_name, VLC_VAR_STRING | VLC_VAR_DOINHERIT );
480 if( !__var_Get( p_obj, psz_name, &val ) )
481 return val.psz_string;
487 * __var_CreateGetInteger() with automatic casting
489 #define var_CreateGetInteger(a,b) __var_CreateGetInteger( VLC_OBJECT(a),b)
491 * __var_CreateGetBool() with automatic casting
493 #define var_CreateGetBool(a,b) __var_CreateGetBool( VLC_OBJECT(a),b)
495 * __var_CreateGetTime() with automatic casting
497 #define var_CreateGetTime(a,b) __var_CreateGetTime( VLC_OBJECT(a),b)
499 * __var_CreateGetFloat() with automatic casting
501 #define var_CreateGetFloat(a,b) __var_CreateGetFloat( VLC_OBJECT(a),b)
503 * __var_CreateGetString() with automatic casting
505 #define var_CreateGetString(a,b) __var_CreateGetString( VLC_OBJECT(a),b)