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 #ifndef VLC_VARIABLES_H
26 #define VLC_VARIABLES_H 1
30 * This file defines functions and structures for dynamic variables in vlc
34 * \defgroup variables Variables
36 * Functions for using the object variables in vlc.
38 * Vlc have a very powerful "object variable" infrastructure useful
44 /*****************************************************************************
45 * Variable types - probably very incomplete
46 *****************************************************************************/
47 #define VLC_VAR_TYPE 0x00ff
48 #define VLC_VAR_CLASS 0x00f0
49 #define VLC_VAR_FLAGS 0xff00
51 /** \defgroup var_flags Additive flags
52 * These flags are added to the type field of the variable. Most as a result of
53 * a __var_Change() call, but some may be added at creation time
56 #define VLC_VAR_HASCHOICE 0x0100
57 #define VLC_VAR_HASMIN 0x0200
58 #define VLC_VAR_HASMAX 0x0400
59 #define VLC_VAR_HASSTEP 0x0800
61 #define VLC_VAR_ISCOMMAND 0x2000
64 /* If the variable is not found on the current module
65 search all parents and finally module config until found */
66 #define VLC_VAR_DOINHERIT 0x8000
70 * \defgroup var_action Variable actions
71 * These are the different actions that can be used with __var_Change().
72 * The parameters given are the meaning of the two last parameters of
73 * __var_Change() when this action is being used.
78 * Set the minimum value of this variable
79 * \param p_val The new minimum value
80 * \param p_val2 Unused
82 #define VLC_VAR_SETMIN 0x0010
84 * Set the maximum value of this variable
85 * \param p_val The new maximum value
86 * \param p_val2 Unused
88 #define VLC_VAR_SETMAX 0x0011
89 #define VLC_VAR_SETSTEP 0x0012
92 * Set the value of this variable without triggering any callbacks
93 * \param p_val The new value
94 * \param p_val2 Unused
96 #define VLC_VAR_SETVALUE 0x0013
98 #define VLC_VAR_SETTEXT 0x0014
99 #define VLC_VAR_GETTEXT 0x0015
101 #define VLC_VAR_GETMIN 0x0016
102 #define VLC_VAR_GETMAX 0x0017
103 #define VLC_VAR_GETSTEP 0x0018
105 #define VLC_VAR_ADDCHOICE 0x0020
106 #define VLC_VAR_DELCHOICE 0x0021
107 #define VLC_VAR_CLEARCHOICES 0x0022
108 #define VLC_VAR_SETDEFAULT 0x0023
109 #define VLC_VAR_GETCHOICES 0x0024
110 #define VLC_VAR_GETLIST 0x0025
111 #define VLC_VAR_CHOICESCOUNT 0x0026
113 #define VLC_VAR_INHERITVALUE 0x0030
115 #define VLC_VAR_SETISCOMMAND 0x0040
118 /** \defgroup var_GetAndSet Variable actions
119 * These are the different actions that can be used with __var_GetAndSet()
123 * Toggle the value of this boolean
126 #define VLC_VAR_TOGGLE_BOOL 0x0010
129 /*****************************************************************************
131 *****************************************************************************/
132 VLC_EXPORT( int, __var_Create, ( vlc_object_t *, const char *, int ) );
133 VLC_EXPORT( int, __var_Destroy, ( vlc_object_t *, const char * ) );
135 VLC_EXPORT( int, __var_Change, ( vlc_object_t *, const char *, int, vlc_value_t *, vlc_value_t * ) );
137 VLC_EXPORT( int, __var_Type, ( vlc_object_t *, const char * ) LIBVLC_USED );
138 VLC_EXPORT( int, __var_Set, ( vlc_object_t *, const char *, vlc_value_t ) );
139 VLC_EXPORT( int, __var_Get, ( vlc_object_t *, const char *, vlc_value_t * ) );
140 VLC_EXPORT( int, var_SetChecked, ( vlc_object_t *, const char *, int, vlc_value_t ) );
141 VLC_EXPORT( int, var_GetChecked, ( vlc_object_t *, const char *, int, vlc_value_t * ) );
142 VLC_EXPORT( int, __var_GetAndSet, ( vlc_object_t *, const char *, int, vlc_value_t ) );
144 #define var_Command(a,b,c,d,e) __var_Command( VLC_OBJECT( a ), b, c, d, e )
145 VLC_EXPORT( int, __var_Command, ( vlc_object_t *, const char *, const char *, const char *, char ** ) );
147 VLC_EXPORT( void, var_FreeList, ( vlc_value_t *, vlc_value_t * ) );
150 * __var_Create() with automatic casting.
152 #define var_Create(a,b,c) __var_Create( VLC_OBJECT(a), b, c )
154 * __var_Destroy() with automatic casting
156 #define var_Destroy(a,b) __var_Destroy( VLC_OBJECT(a), b )
159 * __var_Change() with automatic casting
161 #define var_Change(a,b,c,d,e) __var_Change( VLC_OBJECT(a), b, c, d, e )
164 * __var_Type() with automatic casting
166 #define var_Type(a,b) __var_Type( VLC_OBJECT(a), b )
168 * __var_Set() with automatic casting
170 #define var_Set(a,b,c) __var_Set( VLC_OBJECT(a), b, c )
172 * __var_Get() with automatic casting
174 #define var_Get(a,b,c) __var_Get( VLC_OBJECT(a), b, c )
176 * __var_GetAndSet() with automatic casting
178 #define var_GetAndSet(a,b,c,d) __var_GetAndSet(VLC_OBJECT(a), b, c, d)
180 /*****************************************************************************
182 *****************************************************************************
183 * int MyCallback( vlc_object_t *p_this,
184 * char const *psz_variable,
185 * vlc_value_t oldvalue,
186 * vlc_value_t newvalue,
188 *****************************************************************************/
189 VLC_EXPORT( int, __var_AddCallback, ( vlc_object_t *, const char *, vlc_callback_t, void * ) );
190 VLC_EXPORT( int, __var_DelCallback, ( vlc_object_t *, const char *, vlc_callback_t, void * ) );
191 VLC_EXPORT( int, __var_TriggerCallback, ( vlc_object_t *, const char * ) );
194 * __var_AddCallback() with automatic casting
196 #define var_AddCallback(a,b,c,d) __var_AddCallback( VLC_OBJECT(a), b, c, d )
198 * __var_DelCallback() with automatic casting
200 #define var_DelCallback(a,b,c,d) __var_DelCallback( VLC_OBJECT(a), b, c, d )
202 * __var_TriggerCallback() with automatic casting
204 #define var_TriggerCallback(a,b) __var_TriggerCallback( VLC_OBJECT(a), b )
206 /*****************************************************************************
208 *****************************************************************************/
211 * Set the value of an integer variable
213 * \param p_obj The object that holds the variable
214 * \param psz_name The name of the variable
215 * \param i The new integer value of this variable
217 static inline int __var_SetInteger( vlc_object_t *p_obj, const char *psz_name, int i )
221 return var_SetChecked( p_obj, psz_name, VLC_VAR_INTEGER, val );
225 * Set the value of an boolean variable
227 * \param p_obj The object that holds the variable
228 * \param psz_name The name of the variable
229 * \param b The new boolean value of this variable
231 static inline int __var_SetBool( vlc_object_t *p_obj, const char *psz_name, bool b )
235 return var_SetChecked( p_obj, psz_name, VLC_VAR_BOOL, val );
239 * Set the value of a time variable
241 * \param p_obj The object that holds the variable
242 * \param psz_name The name of the variable
243 * \param i The new time value of this variable
245 static inline int __var_SetTime( vlc_object_t *p_obj, const char *psz_name, int64_t i )
249 return var_SetChecked( p_obj, psz_name, VLC_VAR_TIME, val );
253 * Set the value of a float variable
255 * \param p_obj The object that holds the variable
256 * \param psz_name The name of the variable
257 * \param f The new float value of this variable
259 static inline int __var_SetFloat( vlc_object_t *p_obj, const char *psz_name, float f )
263 return var_SetChecked( p_obj, psz_name, VLC_VAR_FLOAT, val );
267 * Set the value of a string variable
269 * \param p_obj The object that holds the variable
270 * \param psz_name The name of the variable
271 * \param psz_string The new string value of this variable
273 static inline int __var_SetString( vlc_object_t *p_obj, const char *psz_name, const char *psz_string )
276 val.psz_string = (char *)psz_string;
277 return var_SetChecked( p_obj, psz_name, VLC_VAR_STRING, val );
281 * Set the value of a pointer variable
283 * \param p_obj The object that holds the variable
284 * \param psz_name The name of the variable
285 * \param ptr The new pointer value of this variable
288 int __var_SetAddress( vlc_object_t *p_obj, const char *psz_name, void *ptr )
292 return var_SetChecked( p_obj, psz_name, VLC_VAR_ADDRESS, val );
296 * __var_SetInteger() with automatic casting
298 #define var_SetInteger(a,b,c) __var_SetInteger( VLC_OBJECT(a),b,c)
300 * __var_SetBool() with automatic casting
302 #define var_SetBool(a,b,c) __var_SetBool( VLC_OBJECT(a),b,c)
304 * __var_SetTime() with automatic casting
306 #define var_SetTime(a,b,c) __var_SetTime( VLC_OBJECT(a),b,c)
308 * __var_SetFloat() with automatic casting
310 #define var_SetFloat(a,b,c) __var_SetFloat( VLC_OBJECT(a),b,c)
312 * __var_SetString() with automatic casting
314 #define var_SetString(a,b,c) __var_SetString( VLC_OBJECT(a),b,c)
316 * __var_SetAddress() with automatic casting
318 #define var_SetAddress(o, n, p) __var_SetAddress(VLC_OBJECT(o), n, p)
322 * Get an integer value
324 * \param p_obj The object that holds the variable
325 * \param psz_name The name of the variable
328 static inline int __var_GetInteger( vlc_object_t *p_obj, const char *psz_name )
331 if( !var_GetChecked( p_obj, psz_name, VLC_VAR_INTEGER, &val ) )
338 * Get a boolean value
340 * \param p_obj The object that holds the variable
341 * \param psz_name The name of the variable
344 static inline bool __var_GetBool( vlc_object_t *p_obj, const char *psz_name )
346 vlc_value_t val; val.b_bool = false;
348 if( !var_GetChecked( p_obj, psz_name, VLC_VAR_BOOL, &val ) )
357 * \param p_obj The object that holds the variable
358 * \param psz_name The name of the variable
361 static inline int64_t __var_GetTime( vlc_object_t *p_obj, const char *psz_name )
363 vlc_value_t val; val.i_time = 0L;
364 if( !var_GetChecked( p_obj, psz_name, VLC_VAR_TIME, &val ) )
373 * \param p_obj The object that holds the variable
374 * \param psz_name The name of the variable
377 static inline float __var_GetFloat( vlc_object_t *p_obj, const char *psz_name )
379 vlc_value_t val; val.f_float = 0.0;
380 if( !var_GetChecked( p_obj, psz_name, VLC_VAR_FLOAT, &val ) )
389 * \param p_obj The object that holds the variable
390 * \param psz_name The name of the variable
393 static inline char *__var_GetString( vlc_object_t *p_obj, const char *psz_name )
395 vlc_value_t val; val.psz_string = NULL;
396 if( var_GetChecked( p_obj, psz_name, VLC_VAR_STRING, &val ) )
399 return val.psz_string;
403 static inline char *__var_GetNonEmptyString( vlc_object_t *p_obj, const char *psz_name )
406 if( var_GetChecked( p_obj, psz_name, VLC_VAR_STRING, &val ) )
408 if( val.psz_string && *val.psz_string )
409 return val.psz_string;
410 free( val.psz_string );
416 * __var_GetInteger() with automatic casting
418 #define var_GetInteger(a,b) __var_GetInteger( VLC_OBJECT(a),b)
420 * __var_GetBool() with automatic casting
422 #define var_GetBool(a,b) __var_GetBool( VLC_OBJECT(a),b)
424 * __var_GetTime() with automatic casting
426 #define var_GetTime(a,b) __var_GetTime( VLC_OBJECT(a),b)
428 * __var_GetFloat() with automatic casting
430 #define var_GetFloat(a,b) __var_GetFloat( VLC_OBJECT(a),b)
432 * __var_GetString() with automatic casting
434 #define var_GetString(a,b) __var_GetString( VLC_OBJECT(a),b)
435 #define var_GetNonEmptyString(a,b) __var_GetNonEmptyString( VLC_OBJECT(a),b)
440 * Increment an integer variable
441 * \param p_obj the object that holds the variable
442 * \param psz_name the name of the variable
444 static inline void __var_IncInteger( vlc_object_t *p_obj, const char *psz_name )
446 int i_val = __var_GetInteger( p_obj, psz_name );
447 __var_SetInteger( p_obj, psz_name, ++i_val );
449 #define var_IncInteger(a,b) __var_IncInteger( VLC_OBJECT(a), b )
452 * Decrement an integer variable
453 * \param p_obj the object that holds the variable
454 * \param psz_name the name of the variable
456 static inline void __var_DecInteger( vlc_object_t *p_obj, const char *psz_name )
458 int i_val = __var_GetInteger( p_obj, psz_name );
459 __var_SetInteger( p_obj, psz_name, --i_val );
461 #define var_DecInteger(a,b) __var_DecInteger( VLC_OBJECT(a), b )
464 * Create a integer variable with inherit and get its value.
466 * \param p_obj The object that holds the variable
467 * \param psz_name The name of the variable
470 static inline int __var_CreateGetInteger( vlc_object_t *p_obj, const char *psz_name )
472 __var_Create( p_obj, psz_name, VLC_VAR_INTEGER | VLC_VAR_DOINHERIT );
473 return __var_GetInteger( p_obj, psz_name );
477 * Create a boolean variable with inherit and get its value.
479 * \param p_obj The object that holds the variable
480 * \param psz_name The name of the variable
483 static inline bool __var_CreateGetBool( vlc_object_t *p_obj, const char *psz_name )
485 __var_Create( p_obj, psz_name, VLC_VAR_BOOL | VLC_VAR_DOINHERIT );
486 return __var_GetBool( p_obj, psz_name );
490 * Create a time variable with inherit and get its value.
492 * \param p_obj The object that holds the variable
493 * \param psz_name The name of the variable
496 static inline int64_t __var_CreateGetTime( vlc_object_t *p_obj, const char *psz_name )
498 __var_Create( p_obj, psz_name, VLC_VAR_TIME | VLC_VAR_DOINHERIT );
499 return __var_GetTime( p_obj, psz_name );
503 * Create a float variable with inherit and get its value.
505 * \param p_obj The object that holds the variable
506 * \param psz_name The name of the variable
509 static inline float __var_CreateGetFloat( vlc_object_t *p_obj, const char *psz_name )
511 __var_Create( p_obj, psz_name, VLC_VAR_FLOAT | VLC_VAR_DOINHERIT );
512 return __var_GetFloat( p_obj, psz_name );
516 * Create a string variable with inherit and get its value.
518 * \param p_obj The object that holds the variable
519 * \param psz_name The name of the variable
522 static inline char *__var_CreateGetString( vlc_object_t *p_obj,
523 const char *psz_name )
525 __var_Create( p_obj, psz_name, VLC_VAR_STRING | VLC_VAR_DOINHERIT );
526 return __var_GetString( p_obj, psz_name );
530 static inline char *__var_CreateGetNonEmptyString( vlc_object_t *p_obj,
531 const char *psz_name )
533 __var_Create( p_obj, psz_name, VLC_VAR_STRING | VLC_VAR_DOINHERIT );
534 return __var_GetNonEmptyString( p_obj, psz_name );
538 * __var_CreateGetInteger() with automatic casting
540 #define var_CreateGetInteger(a,b) __var_CreateGetInteger( VLC_OBJECT(a),b)
542 * __var_CreateGetBool() with automatic casting
544 #define var_CreateGetBool(a,b) __var_CreateGetBool( VLC_OBJECT(a),b)
546 * __var_CreateGetTime() with automatic casting
548 #define var_CreateGetTime(a,b) __var_CreateGetTime( VLC_OBJECT(a),b)
550 * __var_CreateGetFloat() with automatic casting
552 #define var_CreateGetFloat(a,b) __var_CreateGetFloat( VLC_OBJECT(a),b)
554 * __var_CreateGetString() with automatic casting
556 #define var_CreateGetString(a,b) __var_CreateGetString( VLC_OBJECT(a),b)
557 #define var_CreateGetNonEmptyString(a,b) __var_CreateGetNonEmptyString( VLC_OBJECT(a),b)
560 * Create a integer command variable with inherit and get its value.
562 * \param p_obj The object that holds the variable
563 * \param psz_name The name of the variable
566 static inline int __var_CreateGetIntegerCommand( vlc_object_t *p_obj, const char *psz_name )
568 __var_Create( p_obj, psz_name, VLC_VAR_INTEGER | VLC_VAR_DOINHERIT
569 | VLC_VAR_ISCOMMAND );
570 return __var_GetInteger( p_obj, psz_name );
574 * Create a boolean command variable with inherit and get its value.
576 * \param p_obj The object that holds the variable
577 * \param psz_name The name of the variable
580 static inline bool __var_CreateGetBoolCommand( vlc_object_t *p_obj, const char *psz_name )
582 __var_Create( p_obj, psz_name, VLC_VAR_BOOL | VLC_VAR_DOINHERIT
583 | VLC_VAR_ISCOMMAND );
584 return __var_GetBool( p_obj, psz_name );
588 * Create a time command variable with inherit and get its value.
590 * \param p_obj The object that holds the variable
591 * \param psz_name The name of the variable
594 static inline int64_t __var_CreateGetTimeCommand( vlc_object_t *p_obj, const char *psz_name )
596 __var_Create( p_obj, psz_name, VLC_VAR_TIME | VLC_VAR_DOINHERIT
597 | VLC_VAR_ISCOMMAND );
598 return __var_GetTime( p_obj, psz_name );
602 * Create a float command variable with inherit and get its value.
604 * \param p_obj The object that holds the variable
605 * \param psz_name The name of the variable
608 static inline float __var_CreateGetFloatCommand( vlc_object_t *p_obj, const char *psz_name )
610 __var_Create( p_obj, psz_name, VLC_VAR_FLOAT | VLC_VAR_DOINHERIT
611 | VLC_VAR_ISCOMMAND );
612 return __var_GetFloat( p_obj, psz_name );
616 * Create a string command variable with inherit and get its value.
618 * \param p_obj The object that holds the variable
619 * \param psz_name The name of the variable
622 static inline char *__var_CreateGetStringCommand( vlc_object_t *p_obj,
623 const char *psz_name )
625 __var_Create( p_obj, psz_name, VLC_VAR_STRING | VLC_VAR_DOINHERIT
626 | VLC_VAR_ISCOMMAND );
627 return __var_GetString( p_obj, psz_name );
631 static inline char *__var_CreateGetNonEmptyStringCommand( vlc_object_t *p_obj,
632 const char *psz_name )
634 __var_Create( p_obj, psz_name, VLC_VAR_STRING | VLC_VAR_DOINHERIT
635 | VLC_VAR_ISCOMMAND );
636 return __var_GetNonEmptyString( p_obj, psz_name );
640 * __var_CreateGetInteger() with automatic casting
642 #define var_CreateGetIntegerCommand(a,b) __var_CreateGetIntegerCommand( VLC_OBJECT(a),b)
644 * __var_CreateGetBoolCommand() with automatic casting
646 #define var_CreateGetBoolCommand(a,b) __var_CreateGetBoolCommand( VLC_OBJECT(a),b)
648 * __var_CreateGetTimeCommand() with automatic casting
650 #define var_CreateGetTimeCommand(a,b) __var_CreateGetTimeCommand( VLC_OBJECT(a),b)
652 * __var_CreateGetFloat() with automatic casting
654 #define var_CreateGetFloatCommand(a,b) __var_CreateGetFloatCommand( VLC_OBJECT(a),b)
656 * __var_CreateGetStringCommand() with automatic casting
658 #define var_CreateGetStringCommand(a,b) __var_CreateGetStringCommand( VLC_OBJECT(a),b)
659 #define var_CreateGetNonEmptyStringCommand(a,b) __var_CreateGetNonEmptyStringCommand( VLC_OBJECT(a),b)
661 static inline int __var_CountChoices( vlc_object_t *p_obj, const char *psz_name )
664 if( __var_Change( p_obj, psz_name, VLC_VAR_CHOICESCOUNT, &count, NULL ) )
669 * __var_CountChoices() with automatic casting
671 #define var_CountChoices(a,b) __var_CountChoices( VLC_OBJECT(a),b)
674 static inline int __var_ToggleBool( vlc_object_t *p_obj, const char *psz_name )
677 return __var_GetAndSet( p_obj, psz_name, VLC_VAR_TOGGLE_BOOL, val );
680 * __var_ToggleBool() with automatic casting
682 #define var_ToggleBool(a,b) __var_ToggleBool( VLC_OBJECT(a),b )
686 #endif /* _VLC_VARIABLES_H */