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
128 * Increment or decrement an integer of a given value
129 * \param val the value
131 #define VLC_VAR_INTEGER_INCDEC 0x0020
134 /*****************************************************************************
136 *****************************************************************************/
137 VLC_EXPORT( int, __var_Create, ( vlc_object_t *, const char *, int ) );
138 VLC_EXPORT( int, __var_Destroy, ( vlc_object_t *, const char * ) );
140 VLC_EXPORT( int, __var_Change, ( vlc_object_t *, const char *, int, vlc_value_t *, vlc_value_t * ) );
142 VLC_EXPORT( int, __var_Type, ( vlc_object_t *, const char * ) LIBVLC_USED );
143 VLC_EXPORT( int, __var_Set, ( vlc_object_t *, const char *, vlc_value_t ) );
144 VLC_EXPORT( int, __var_Get, ( vlc_object_t *, const char *, vlc_value_t * ) );
145 VLC_EXPORT( int, var_SetChecked, ( vlc_object_t *, const char *, int, vlc_value_t ) );
146 VLC_EXPORT( int, var_GetChecked, ( vlc_object_t *, const char *, int, vlc_value_t * ) );
147 VLC_EXPORT( int, __var_GetAndSet, ( vlc_object_t *, const char *, int, vlc_value_t ) );
149 #define var_Command(a,b,c,d,e) __var_Command( VLC_OBJECT( a ), b, c, d, e )
150 VLC_EXPORT( int, __var_Command, ( vlc_object_t *, const char *, const char *, const char *, char ** ) );
152 VLC_EXPORT( void, var_FreeList, ( vlc_value_t *, vlc_value_t * ) );
155 * __var_Create() with automatic casting.
157 #define var_Create(a,b,c) __var_Create( VLC_OBJECT(a), b, c )
159 * __var_Destroy() with automatic casting
161 #define var_Destroy(a,b) __var_Destroy( VLC_OBJECT(a), b )
164 * __var_Change() with automatic casting
166 #define var_Change(a,b,c,d,e) __var_Change( VLC_OBJECT(a), b, c, d, e )
169 * __var_Type() with automatic casting
171 #define var_Type(a,b) __var_Type( VLC_OBJECT(a), b )
173 * __var_Set() with automatic casting
175 #define var_Set(a,b,c) __var_Set( VLC_OBJECT(a), b, c )
177 * __var_Get() with automatic casting
179 #define var_Get(a,b,c) __var_Get( VLC_OBJECT(a), b, c )
181 * __var_GetAndSet() with automatic casting
183 #define var_GetAndSet(a,b,c,d) __var_GetAndSet(VLC_OBJECT(a), b, c, d)
185 /*****************************************************************************
187 *****************************************************************************
188 * int MyCallback( vlc_object_t *p_this,
189 * char const *psz_variable,
190 * vlc_value_t oldvalue,
191 * vlc_value_t newvalue,
193 *****************************************************************************/
194 VLC_EXPORT( int, __var_AddCallback, ( vlc_object_t *, const char *, vlc_callback_t, void * ) );
195 VLC_EXPORT( int, __var_DelCallback, ( vlc_object_t *, const char *, vlc_callback_t, void * ) );
196 VLC_EXPORT( int, __var_TriggerCallback, ( vlc_object_t *, const char * ) );
199 * __var_AddCallback() with automatic casting
201 #define var_AddCallback(a,b,c,d) __var_AddCallback( VLC_OBJECT(a), b, c, d )
203 * __var_DelCallback() with automatic casting
205 #define var_DelCallback(a,b,c,d) __var_DelCallback( VLC_OBJECT(a), b, c, d )
207 * __var_TriggerCallback() with automatic casting
209 #define var_TriggerCallback(a,b) __var_TriggerCallback( VLC_OBJECT(a), b )
211 /*****************************************************************************
213 *****************************************************************************/
216 * Set the value of an integer variable
218 * \param p_obj The object that holds the variable
219 * \param psz_name The name of the variable
220 * \param i The new integer value of this variable
222 static inline int __var_SetInteger( vlc_object_t *p_obj, const char *psz_name, int i )
226 return var_SetChecked( p_obj, psz_name, VLC_VAR_INTEGER, val );
230 * Set the value of an boolean variable
232 * \param p_obj The object that holds the variable
233 * \param psz_name The name of the variable
234 * \param b The new boolean value of this variable
236 static inline int __var_SetBool( vlc_object_t *p_obj, const char *psz_name, bool b )
240 return var_SetChecked( p_obj, psz_name, VLC_VAR_BOOL, val );
244 * Set the value of a time variable
246 * \param p_obj The object that holds the variable
247 * \param psz_name The name of the variable
248 * \param i The new time value of this variable
250 static inline int __var_SetTime( vlc_object_t *p_obj, const char *psz_name, int64_t i )
254 return var_SetChecked( p_obj, psz_name, VLC_VAR_TIME, val );
258 * Set the value of a float variable
260 * \param p_obj The object that holds the variable
261 * \param psz_name The name of the variable
262 * \param f The new float value of this variable
264 static inline int __var_SetFloat( vlc_object_t *p_obj, const char *psz_name, float f )
268 return var_SetChecked( p_obj, psz_name, VLC_VAR_FLOAT, val );
272 * Set the value of a string variable
274 * \param p_obj The object that holds the variable
275 * \param psz_name The name of the variable
276 * \param psz_string The new string value of this variable
278 static inline int __var_SetString( vlc_object_t *p_obj, const char *psz_name, const char *psz_string )
281 val.psz_string = (char *)psz_string;
282 return var_SetChecked( p_obj, psz_name, VLC_VAR_STRING, val );
286 * Set the value of a pointer variable
288 * \param p_obj The object that holds the variable
289 * \param psz_name The name of the variable
290 * \param ptr The new pointer value of this variable
293 int __var_SetAddress( vlc_object_t *p_obj, const char *psz_name, void *ptr )
297 return var_SetChecked( p_obj, psz_name, VLC_VAR_ADDRESS, val );
301 * __var_SetInteger() with automatic casting
303 #define var_SetInteger(a,b,c) __var_SetInteger( VLC_OBJECT(a),b,c)
305 * __var_SetBool() with automatic casting
307 #define var_SetBool(a,b,c) __var_SetBool( VLC_OBJECT(a),b,c)
309 * __var_SetTime() with automatic casting
311 #define var_SetTime(a,b,c) __var_SetTime( VLC_OBJECT(a),b,c)
313 * __var_SetFloat() with automatic casting
315 #define var_SetFloat(a,b,c) __var_SetFloat( VLC_OBJECT(a),b,c)
317 * __var_SetString() with automatic casting
319 #define var_SetString(a,b,c) __var_SetString( VLC_OBJECT(a),b,c)
321 * __var_SetAddress() with automatic casting
323 #define var_SetAddress(o, n, p) __var_SetAddress(VLC_OBJECT(o), n, p)
327 * Get an integer value
329 * \param p_obj The object that holds the variable
330 * \param psz_name The name of the variable
333 static inline int __var_GetInteger( vlc_object_t *p_obj, const char *psz_name )
336 if( !var_GetChecked( p_obj, psz_name, VLC_VAR_INTEGER, &val ) )
343 * Get a boolean value
345 * \param p_obj The object that holds the variable
346 * \param psz_name The name of the variable
349 static inline bool __var_GetBool( vlc_object_t *p_obj, const char *psz_name )
351 vlc_value_t val; val.b_bool = false;
353 if( !var_GetChecked( p_obj, psz_name, VLC_VAR_BOOL, &val ) )
362 * \param p_obj The object that holds the variable
363 * \param psz_name The name of the variable
366 static inline int64_t __var_GetTime( vlc_object_t *p_obj, const char *psz_name )
368 vlc_value_t val; val.i_time = 0L;
369 if( !var_GetChecked( p_obj, psz_name, VLC_VAR_TIME, &val ) )
378 * \param p_obj The object that holds the variable
379 * \param psz_name The name of the variable
382 static inline float __var_GetFloat( vlc_object_t *p_obj, const char *psz_name )
384 vlc_value_t val; val.f_float = 0.0;
385 if( !var_GetChecked( p_obj, psz_name, VLC_VAR_FLOAT, &val ) )
394 * \param p_obj The object that holds the variable
395 * \param psz_name The name of the variable
398 static inline char *__var_GetString( vlc_object_t *p_obj, const char *psz_name )
400 vlc_value_t val; val.psz_string = NULL;
401 if( var_GetChecked( p_obj, psz_name, VLC_VAR_STRING, &val ) )
404 return val.psz_string;
408 static inline char *__var_GetNonEmptyString( vlc_object_t *p_obj, const char *psz_name )
411 if( var_GetChecked( p_obj, psz_name, VLC_VAR_STRING, &val ) )
413 if( val.psz_string && *val.psz_string )
414 return val.psz_string;
415 free( val.psz_string );
420 static inline void *__var_GetAddress( vlc_object_t *p_obj, const char *psz_name )
423 if( var_GetChecked( p_obj, psz_name, VLC_VAR_ADDRESS, &val ) )
426 return val.p_address;
430 * __var_GetInteger() with automatic casting
432 #define var_GetInteger(a,b) __var_GetInteger( VLC_OBJECT(a),b)
434 * __var_GetBool() with automatic casting
436 #define var_GetBool(a,b) __var_GetBool( VLC_OBJECT(a),b)
438 * __var_GetTime() with automatic casting
440 #define var_GetTime(a,b) __var_GetTime( VLC_OBJECT(a),b)
442 * __var_GetFloat() with automatic casting
444 #define var_GetFloat(a,b) __var_GetFloat( VLC_OBJECT(a),b)
446 * __var_GetString() with automatic casting
448 #define var_GetString(a,b) __var_GetString( VLC_OBJECT(a),b)
449 #define var_GetNonEmptyString(a,b) __var_GetNonEmptyString( VLC_OBJECT(a),b)
451 * __var_GetAddress() with automatic casting
453 #define var_GetAddress(a,b) __var_GetAddress( VLC_OBJECT(a),b)
458 * Increment an integer variable
459 * \param p_obj the object that holds the variable
460 * \param psz_name the name of the variable
462 static inline void __var_IncInteger( vlc_object_t *p_obj, const char *psz_name )
466 __var_GetAndSet( p_obj, psz_name, VLC_VAR_INTEGER_INCDEC, val );
468 #define var_IncInteger(a,b) __var_IncInteger( VLC_OBJECT(a), b )
471 * Decrement an integer variable
472 * \param p_obj the object that holds the variable
473 * \param psz_name the name of the variable
475 static inline void __var_DecInteger( vlc_object_t *p_obj, const char *psz_name )
479 __var_GetAndSet( p_obj, psz_name, VLC_VAR_INTEGER_INCDEC, val );
481 #define var_DecInteger(a,b) __var_DecInteger( VLC_OBJECT(a), b )
484 * Create a integer variable with inherit and get its value.
486 * \param p_obj The object that holds the variable
487 * \param psz_name The name of the variable
490 static inline int __var_CreateGetInteger( vlc_object_t *p_obj, const char *psz_name )
492 __var_Create( p_obj, psz_name, VLC_VAR_INTEGER | VLC_VAR_DOINHERIT );
493 return __var_GetInteger( p_obj, psz_name );
497 * Create a boolean variable with inherit and get its value.
499 * \param p_obj The object that holds the variable
500 * \param psz_name The name of the variable
503 static inline bool __var_CreateGetBool( vlc_object_t *p_obj, const char *psz_name )
505 __var_Create( p_obj, psz_name, VLC_VAR_BOOL | VLC_VAR_DOINHERIT );
506 return __var_GetBool( p_obj, psz_name );
510 * Create a time variable with inherit and get its value.
512 * \param p_obj The object that holds the variable
513 * \param psz_name The name of the variable
516 static inline int64_t __var_CreateGetTime( vlc_object_t *p_obj, const char *psz_name )
518 __var_Create( p_obj, psz_name, VLC_VAR_TIME | VLC_VAR_DOINHERIT );
519 return __var_GetTime( p_obj, psz_name );
523 * Create a float variable with inherit and get its value.
525 * \param p_obj The object that holds the variable
526 * \param psz_name The name of the variable
529 static inline float __var_CreateGetFloat( vlc_object_t *p_obj, const char *psz_name )
531 __var_Create( p_obj, psz_name, VLC_VAR_FLOAT | VLC_VAR_DOINHERIT );
532 return __var_GetFloat( p_obj, psz_name );
536 * Create a string variable with inherit and get its value.
538 * \param p_obj The object that holds the variable
539 * \param psz_name The name of the variable
542 static inline char *__var_CreateGetString( vlc_object_t *p_obj,
543 const char *psz_name )
545 __var_Create( p_obj, psz_name, VLC_VAR_STRING | VLC_VAR_DOINHERIT );
546 return __var_GetString( p_obj, psz_name );
550 static inline char *__var_CreateGetNonEmptyString( vlc_object_t *p_obj,
551 const char *psz_name )
553 __var_Create( p_obj, psz_name, VLC_VAR_STRING | VLC_VAR_DOINHERIT );
554 return __var_GetNonEmptyString( p_obj, psz_name );
558 * Create an address variable with inherit and get its value.
560 * \param p_obj The object that holds the variable
561 * \param psz_name The name of the variable
564 static inline void *__var_CreateGetAddress( vlc_object_t *p_obj,
565 const char *psz_name )
567 __var_Create( p_obj, psz_name, VLC_VAR_ADDRESS | VLC_VAR_DOINHERIT );
568 return __var_GetAddress( p_obj, psz_name );
572 * __var_CreateGetInteger() with automatic casting
574 #define var_CreateGetInteger(a,b) __var_CreateGetInteger( VLC_OBJECT(a),b)
576 * __var_CreateGetBool() with automatic casting
578 #define var_CreateGetBool(a,b) __var_CreateGetBool( VLC_OBJECT(a),b)
580 * __var_CreateGetTime() with automatic casting
582 #define var_CreateGetTime(a,b) __var_CreateGetTime( VLC_OBJECT(a),b)
584 * __var_CreateGetFloat() with automatic casting
586 #define var_CreateGetFloat(a,b) __var_CreateGetFloat( VLC_OBJECT(a),b)
588 * __var_CreateGetString() with automatic casting
590 #define var_CreateGetString(a,b) __var_CreateGetString( VLC_OBJECT(a),b)
591 #define var_CreateGetNonEmptyString(a,b) __var_CreateGetNonEmptyString( VLC_OBJECT(a),b)
593 * __var_CreateGetString() with automatic casting
595 #define var_CreateGetAddress(a,b) __var_CreateGetAddress( VLC_OBJECT(a),b)
598 * Create a integer command variable with inherit and get its value.
600 * \param p_obj The object that holds the variable
601 * \param psz_name The name of the variable
604 static inline int __var_CreateGetIntegerCommand( vlc_object_t *p_obj, const char *psz_name )
606 __var_Create( p_obj, psz_name, VLC_VAR_INTEGER | VLC_VAR_DOINHERIT
607 | VLC_VAR_ISCOMMAND );
608 return __var_GetInteger( p_obj, psz_name );
612 * Create a boolean command variable with inherit and get its value.
614 * \param p_obj The object that holds the variable
615 * \param psz_name The name of the variable
618 static inline bool __var_CreateGetBoolCommand( vlc_object_t *p_obj, const char *psz_name )
620 __var_Create( p_obj, psz_name, VLC_VAR_BOOL | VLC_VAR_DOINHERIT
621 | VLC_VAR_ISCOMMAND );
622 return __var_GetBool( p_obj, psz_name );
626 * Create a time command variable with inherit and get its value.
628 * \param p_obj The object that holds the variable
629 * \param psz_name The name of the variable
632 static inline int64_t __var_CreateGetTimeCommand( vlc_object_t *p_obj, const char *psz_name )
634 __var_Create( p_obj, psz_name, VLC_VAR_TIME | VLC_VAR_DOINHERIT
635 | VLC_VAR_ISCOMMAND );
636 return __var_GetTime( p_obj, psz_name );
640 * Create a float command variable with inherit and get its value.
642 * \param p_obj The object that holds the variable
643 * \param psz_name The name of the variable
646 static inline float __var_CreateGetFloatCommand( vlc_object_t *p_obj, const char *psz_name )
648 __var_Create( p_obj, psz_name, VLC_VAR_FLOAT | VLC_VAR_DOINHERIT
649 | VLC_VAR_ISCOMMAND );
650 return __var_GetFloat( p_obj, psz_name );
654 * Create a string command variable with inherit and get its value.
656 * \param p_obj The object that holds the variable
657 * \param psz_name The name of the variable
660 static inline char *__var_CreateGetStringCommand( vlc_object_t *p_obj,
661 const char *psz_name )
663 __var_Create( p_obj, psz_name, VLC_VAR_STRING | VLC_VAR_DOINHERIT
664 | VLC_VAR_ISCOMMAND );
665 return __var_GetString( p_obj, psz_name );
669 static inline char *__var_CreateGetNonEmptyStringCommand( vlc_object_t *p_obj,
670 const char *psz_name )
672 __var_Create( p_obj, psz_name, VLC_VAR_STRING | VLC_VAR_DOINHERIT
673 | VLC_VAR_ISCOMMAND );
674 return __var_GetNonEmptyString( p_obj, psz_name );
678 * __var_CreateGetInteger() with automatic casting
680 #define var_CreateGetIntegerCommand(a,b) __var_CreateGetIntegerCommand( VLC_OBJECT(a),b)
682 * __var_CreateGetBoolCommand() with automatic casting
684 #define var_CreateGetBoolCommand(a,b) __var_CreateGetBoolCommand( VLC_OBJECT(a),b)
686 * __var_CreateGetTimeCommand() with automatic casting
688 #define var_CreateGetTimeCommand(a,b) __var_CreateGetTimeCommand( VLC_OBJECT(a),b)
690 * __var_CreateGetFloat() with automatic casting
692 #define var_CreateGetFloatCommand(a,b) __var_CreateGetFloatCommand( VLC_OBJECT(a),b)
694 * __var_CreateGetStringCommand() with automatic casting
696 #define var_CreateGetStringCommand(a,b) __var_CreateGetStringCommand( VLC_OBJECT(a),b)
697 #define var_CreateGetNonEmptyStringCommand(a,b) __var_CreateGetNonEmptyStringCommand( VLC_OBJECT(a),b)
700 static inline int __var_CountChoices( vlc_object_t *p_obj, const char *psz_name )
703 if( __var_Change( p_obj, psz_name, VLC_VAR_CHOICESCOUNT, &count, NULL ) )
708 * __var_CountChoices() with automatic casting
710 #define var_CountChoices(a,b) __var_CountChoices( VLC_OBJECT(a),b)
713 static inline int __var_ToggleBool( vlc_object_t *p_obj, const char *psz_name )
716 return __var_GetAndSet( p_obj, psz_name, VLC_VAR_TOGGLE_BOOL, val );
719 * __var_ToggleBool() with automatic casting
721 #define var_ToggleBool(a,b) __var_ToggleBool( VLC_OBJECT(a),b )
725 #endif /* _VLC_VARIABLES_H */