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_SETISCOMMAND 0x0040
116 /** \defgroup var_GetAndSet Variable actions
117 * These are the different actions that can be used with var_GetAndSet()
121 VLC_VAR_BOOL_TOGGLE, /**< Invert a boolean value (param ignored) */
122 VLC_VAR_INTEGER_ADD, /**< Add parameter to an integer value */
123 VLC_VAR_INTEGER_OR, /**< Binary OR over an integer bits field */
124 VLC_VAR_INTEGER_NAND,/**< Binary NAND over an integer bits field */
128 /*****************************************************************************
130 *****************************************************************************/
131 VLC_EXPORT( int, var_Create, ( vlc_object_t *, const char *, int ) );
132 #define var_Create(a,b,c) var_Create( VLC_OBJECT(a), b, c )
134 VLC_EXPORT( int, var_Destroy, ( vlc_object_t *, const char * ) );
135 #define var_Destroy(a,b) var_Destroy( VLC_OBJECT(a), b )
137 VLC_EXPORT( int, var_Change, ( vlc_object_t *, const char *, int, vlc_value_t *, vlc_value_t * ) );
138 #define var_Change(a,b,c,d,e) var_Change( VLC_OBJECT(a), b, c, d, e )
140 VLC_EXPORT( int, var_Type, ( vlc_object_t *, const char * ) LIBVLC_USED );
141 #define var_Type(a,b) var_Type( VLC_OBJECT(a), b )
143 VLC_EXPORT( int, var_Set, ( vlc_object_t *, const char *, vlc_value_t ) );
144 #define var_Set(a,b,c) var_Set( VLC_OBJECT(a), b, c )
146 VLC_EXPORT( int, var_Get, ( vlc_object_t *, const char *, vlc_value_t * ) );
147 #define var_Get(a,b,c) var_Get( VLC_OBJECT(a), b, c )
149 VLC_EXPORT( int, var_SetChecked, ( vlc_object_t *, const char *, int, vlc_value_t ) );
150 #define var_SetChecked(o,n,t,v) var_SetChecked(VLC_OBJECT(o),n,t,v)
151 VLC_EXPORT( int, var_GetChecked, ( vlc_object_t *, const char *, int, vlc_value_t * ) );
152 #define var_GetChecked(o,n,t,v) var_GetChecked(VLC_OBJECT(o),n,t,v)
153 VLC_EXPORT( int, var_GetAndSet, ( vlc_object_t *, const char *, int, vlc_value_t * ) );
155 VLC_EXPORT( int, var_Inherit, ( vlc_object_t *, const char *, int, vlc_value_t * ) );
157 VLC_EXPORT( int, var_Command, ( vlc_object_t *, const char *, const char *, const char *, char ** ) );
158 #define var_Command(a,b,c,d,e) var_Command( VLC_OBJECT( a ), b, c, d, e )
160 VLC_EXPORT( void, var_FreeList, ( vlc_value_t *, vlc_value_t * ) );
163 /*****************************************************************************
165 *****************************************************************************
166 * int MyCallback( vlc_object_t *p_this,
167 * char const *psz_variable,
168 * vlc_value_t oldvalue,
169 * vlc_value_t newvalue,
171 *****************************************************************************/
172 VLC_EXPORT( int, var_AddCallback, ( vlc_object_t *, const char *, vlc_callback_t, void * ) );
173 VLC_EXPORT( int, var_DelCallback, ( vlc_object_t *, const char *, vlc_callback_t, void * ) );
174 VLC_EXPORT( int, var_TriggerCallback, ( vlc_object_t *, const char * ) );
176 #define var_AddCallback(a,b,c,d) var_AddCallback( VLC_OBJECT(a), b, c, d )
177 #define var_DelCallback(a,b,c,d) var_DelCallback( VLC_OBJECT(a), b, c, d )
178 #define var_TriggerCallback(a,b) var_TriggerCallback( VLC_OBJECT(a), b )
180 /*****************************************************************************
182 *****************************************************************************/
185 * Set the value of an integer variable
187 * \param p_obj The object that holds the variable
188 * \param psz_name The name of the variable
189 * \param i The new integer value of this variable
191 static inline int var_SetInteger( vlc_object_t *p_obj, const char *psz_name, int i )
195 return var_SetChecked( p_obj, psz_name, VLC_VAR_INTEGER, val );
199 * Set the value of an boolean variable
201 * \param p_obj The object that holds the variable
202 * \param psz_name The name of the variable
203 * \param b The new boolean value of this variable
205 static inline int var_SetBool( vlc_object_t *p_obj, const char *psz_name, bool b )
209 return var_SetChecked( p_obj, psz_name, VLC_VAR_BOOL, val );
213 * Set the value of a time variable
215 * \param p_obj The object that holds the variable
216 * \param psz_name The name of the variable
217 * \param i The new time value of this variable
219 static inline int var_SetTime( vlc_object_t *p_obj, const char *psz_name, int64_t i )
223 return var_SetChecked( p_obj, psz_name, VLC_VAR_TIME, val );
226 static inline int var_SetCoords( vlc_object_t *obj, const char *name,
227 int32_t x, int32_t y )
232 return var_SetChecked (obj, name, VLC_VAR_COORDS, val);
234 #define var_SetCoords(o,n,x,y) var_SetCoords(VLC_OBJECT(o),n,x,y)
237 * Set the value of a float variable
239 * \param p_obj The object that holds the variable
240 * \param psz_name The name of the variable
241 * \param f The new float value of this variable
243 static inline int var_SetFloat( vlc_object_t *p_obj, const char *psz_name, float f )
247 return var_SetChecked( p_obj, psz_name, VLC_VAR_FLOAT, val );
251 * Set the value of a string variable
253 * \param p_obj The object that holds the variable
254 * \param psz_name The name of the variable
255 * \param psz_string The new string value of this variable
257 static inline int var_SetString( vlc_object_t *p_obj, const char *psz_name, const char *psz_string )
260 val.psz_string = (char *)psz_string;
261 return var_SetChecked( p_obj, psz_name, VLC_VAR_STRING, val );
265 * Set the value of a pointer variable
267 * \param p_obj The object that holds the variable
268 * \param psz_name The name of the variable
269 * \param ptr The new pointer value of this variable
272 int var_SetAddress( vlc_object_t *p_obj, const char *psz_name, void *ptr )
276 return var_SetChecked( p_obj, psz_name, VLC_VAR_ADDRESS, val );
279 #define var_SetInteger(a,b,c) var_SetInteger( VLC_OBJECT(a),b,c)
280 #define var_SetBool(a,b,c) var_SetBool( VLC_OBJECT(a),b,c)
281 #define var_SetTime(a,b,c) var_SetTime( VLC_OBJECT(a),b,c)
282 #define var_SetFloat(a,b,c) var_SetFloat( VLC_OBJECT(a),b,c)
283 #define var_SetString(a,b,c) var_SetString( VLC_OBJECT(a),b,c)
284 #define var_SetAddress(o, n, p) var_SetAddress(VLC_OBJECT(o), n, p)
288 * Get an integer value
290 * \param p_obj The object that holds the variable
291 * \param psz_name The name of the variable
294 static inline int var_GetInteger( vlc_object_t *p_obj, const char *psz_name )
297 if( !var_GetChecked( p_obj, psz_name, VLC_VAR_INTEGER, &val ) )
304 * Get a boolean value
306 * \param p_obj The object that holds the variable
307 * \param psz_name The name of the variable
310 static inline bool var_GetBool( vlc_object_t *p_obj, const char *psz_name )
312 vlc_value_t val; val.b_bool = false;
314 if( !var_GetChecked( p_obj, psz_name, VLC_VAR_BOOL, &val ) )
323 * \param p_obj The object that holds the variable
324 * \param psz_name The name of the variable
327 static inline int64_t var_GetTime( vlc_object_t *p_obj, const char *psz_name )
329 vlc_value_t val; val.i_time = 0L;
330 if( !var_GetChecked( p_obj, psz_name, VLC_VAR_TIME, &val ) )
336 static inline void var_GetCoords( vlc_object_t *obj, const char *name,
337 int32_t *px, int32_t *py )
341 if (likely(!var_GetChecked (obj, name, VLC_VAR_COORDS, &val)))
349 #define var_GetCoords(o,n,x,y) var_GetCoords(VLC_OBJECT(o),n,x,y)
354 * \param p_obj The object that holds the variable
355 * \param psz_name The name of the variable
358 static inline float var_GetFloat( vlc_object_t *p_obj, const char *psz_name )
360 vlc_value_t val; val.f_float = 0.0;
361 if( !var_GetChecked( p_obj, psz_name, VLC_VAR_FLOAT, &val ) )
370 * \param p_obj The object that holds the variable
371 * \param psz_name The name of the variable
374 static inline char *var_GetString( vlc_object_t *p_obj, const char *psz_name )
376 vlc_value_t val; val.psz_string = NULL;
377 if( var_GetChecked( p_obj, psz_name, VLC_VAR_STRING, &val ) )
380 return val.psz_string;
384 static inline char *var_GetNonEmptyString( vlc_object_t *p_obj, const char *psz_name )
387 if( var_GetChecked( p_obj, psz_name, VLC_VAR_STRING, &val ) )
389 if( val.psz_string && *val.psz_string )
390 return val.psz_string;
391 free( val.psz_string );
396 static inline void *var_GetAddress( vlc_object_t *p_obj, const char *psz_name )
399 if( var_GetChecked( p_obj, psz_name, VLC_VAR_ADDRESS, &val ) )
402 return val.p_address;
406 * Increment an integer variable
407 * \param p_obj the object that holds the variable
408 * \param psz_name the name of the variable
410 static inline int var_IncInteger( vlc_object_t *p_obj, const char *psz_name )
414 var_GetAndSet( p_obj, psz_name, VLC_VAR_INTEGER_ADD, &val );
417 #define var_IncInteger(a,b) var_IncInteger( VLC_OBJECT(a), b )
420 * Decrement an integer variable
421 * \param p_obj the object that holds the variable
422 * \param psz_name the name of the variable
424 static inline int var_DecInteger( vlc_object_t *p_obj, const char *psz_name )
428 var_GetAndSet( p_obj, psz_name, VLC_VAR_INTEGER_ADD, &val );
431 #define var_DecInteger(a,b) var_DecInteger( VLC_OBJECT(a), b )
433 static inline unsigned var_OrInteger( vlc_object_t *obj, const char *name,
438 var_GetAndSet( obj, name, VLC_VAR_INTEGER_OR, &val );
441 #define var_OrInteger(a,b,c) var_OrInteger(VLC_OBJECT(a),b,c)
443 static inline unsigned var_NAndInteger( vlc_object_t *obj, const char *name,
448 var_GetAndSet( obj, name, VLC_VAR_INTEGER_NAND, &val );
451 #define var_NAndInteger(a,b,c) var_NAndInteger(VLC_OBJECT(a),b,c)
454 * Create a integer 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
460 static inline int var_CreateGetInteger( vlc_object_t *p_obj, const char *psz_name )
462 var_Create( p_obj, psz_name, VLC_VAR_INTEGER | VLC_VAR_DOINHERIT );
463 return var_GetInteger( p_obj, psz_name );
467 * Create a boolean variable with inherit and get its value.
469 * \param p_obj The object that holds the variable
470 * \param psz_name The name of the variable
473 static inline bool var_CreateGetBool( vlc_object_t *p_obj, const char *psz_name )
475 var_Create( p_obj, psz_name, VLC_VAR_BOOL | VLC_VAR_DOINHERIT );
476 return var_GetBool( p_obj, psz_name );
480 * Create a time variable with inherit and get its value.
482 * \param p_obj The object that holds the variable
483 * \param psz_name The name of the variable
486 static inline int64_t var_CreateGetTime( vlc_object_t *p_obj, const char *psz_name )
488 var_Create( p_obj, psz_name, VLC_VAR_TIME | VLC_VAR_DOINHERIT );
489 return var_GetTime( p_obj, psz_name );
493 * Create a float variable with inherit and get its value.
495 * \param p_obj The object that holds the variable
496 * \param psz_name The name of the variable
499 static inline float var_CreateGetFloat( vlc_object_t *p_obj, const char *psz_name )
501 var_Create( p_obj, psz_name, VLC_VAR_FLOAT | VLC_VAR_DOINHERIT );
502 return var_GetFloat( p_obj, psz_name );
506 * Create a string variable with inherit and get its value.
508 * \param p_obj The object that holds the variable
509 * \param psz_name The name of the variable
512 static inline char *var_CreateGetString( vlc_object_t *p_obj,
513 const char *psz_name )
515 var_Create( p_obj, psz_name, VLC_VAR_STRING | VLC_VAR_DOINHERIT );
516 return var_GetString( p_obj, psz_name );
520 static inline char *var_CreateGetNonEmptyString( vlc_object_t *p_obj,
521 const char *psz_name )
523 var_Create( p_obj, psz_name, VLC_VAR_STRING | VLC_VAR_DOINHERIT );
524 return var_GetNonEmptyString( p_obj, psz_name );
528 * Create an address variable with inherit and get its value.
530 * \param p_obj The object that holds the variable
531 * \param psz_name The name of the variable
534 static inline void *var_CreateGetAddress( vlc_object_t *p_obj,
535 const char *psz_name )
537 var_Create( p_obj, psz_name, VLC_VAR_ADDRESS | VLC_VAR_DOINHERIT );
538 return var_GetAddress( p_obj, psz_name );
541 #define var_CreateGetInteger(a,b) var_CreateGetInteger( VLC_OBJECT(a),b)
542 #define var_CreateGetBool(a,b) var_CreateGetBool( VLC_OBJECT(a),b)
543 #define var_CreateGetTime(a,b) var_CreateGetTime( VLC_OBJECT(a),b)
544 #define var_CreateGetFloat(a,b) var_CreateGetFloat( VLC_OBJECT(a),b)
545 #define var_CreateGetString(a,b) var_CreateGetString( VLC_OBJECT(a),b)
546 #define var_CreateGetNonEmptyString(a,b) var_CreateGetNonEmptyString( VLC_OBJECT(a),b)
547 #define var_CreateGetAddress(a,b) var_CreateGetAddress( VLC_OBJECT(a),b)
550 * Create a integer command variable with inherit and get its value.
552 * \param p_obj The object that holds the variable
553 * \param psz_name The name of the variable
556 static inline int var_CreateGetIntegerCommand( vlc_object_t *p_obj, const char *psz_name )
558 var_Create( p_obj, psz_name, VLC_VAR_INTEGER | VLC_VAR_DOINHERIT
559 | VLC_VAR_ISCOMMAND );
560 return var_GetInteger( p_obj, psz_name );
564 * Create a boolean command variable with inherit and get its value.
566 * \param p_obj The object that holds the variable
567 * \param psz_name The name of the variable
570 static inline bool var_CreateGetBoolCommand( vlc_object_t *p_obj, const char *psz_name )
572 var_Create( p_obj, psz_name, VLC_VAR_BOOL | VLC_VAR_DOINHERIT
573 | VLC_VAR_ISCOMMAND );
574 return var_GetBool( p_obj, psz_name );
578 * Create a time command variable with inherit and get its value.
580 * \param p_obj The object that holds the variable
581 * \param psz_name The name of the variable
584 static inline int64_t var_CreateGetTimeCommand( vlc_object_t *p_obj, const char *psz_name )
586 var_Create( p_obj, psz_name, VLC_VAR_TIME | VLC_VAR_DOINHERIT
587 | VLC_VAR_ISCOMMAND );
588 return var_GetTime( p_obj, psz_name );
592 * Create a float command variable with inherit and get its value.
594 * \param p_obj The object that holds the variable
595 * \param psz_name The name of the variable
598 static inline float var_CreateGetFloatCommand( vlc_object_t *p_obj, const char *psz_name )
600 var_Create( p_obj, psz_name, VLC_VAR_FLOAT | VLC_VAR_DOINHERIT
601 | VLC_VAR_ISCOMMAND );
602 return var_GetFloat( p_obj, psz_name );
606 * Create a string command variable with inherit and get its value.
608 * \param p_obj The object that holds the variable
609 * \param psz_name The name of the variable
612 static inline char *var_CreateGetStringCommand( vlc_object_t *p_obj,
613 const char *psz_name )
615 var_Create( p_obj, psz_name, VLC_VAR_STRING | VLC_VAR_DOINHERIT
616 | VLC_VAR_ISCOMMAND );
617 return var_GetString( p_obj, psz_name );
621 static inline char *var_CreateGetNonEmptyStringCommand( vlc_object_t *p_obj,
622 const char *psz_name )
624 var_Create( p_obj, psz_name, VLC_VAR_STRING | VLC_VAR_DOINHERIT
625 | VLC_VAR_ISCOMMAND );
626 return var_GetNonEmptyString( p_obj, psz_name );
629 #define var_CreateGetIntegerCommand(a,b) var_CreateGetIntegerCommand( VLC_OBJECT(a),b)
630 #define var_CreateGetBoolCommand(a,b) var_CreateGetBoolCommand( VLC_OBJECT(a),b)
631 #define var_CreateGetTimeCommand(a,b) var_CreateGetTimeCommand( VLC_OBJECT(a),b)
632 #define var_CreateGetFloatCommand(a,b) var_CreateGetFloatCommand( VLC_OBJECT(a),b)
633 #define var_CreateGetStringCommand(a,b) var_CreateGetStringCommand( VLC_OBJECT(a),b)
634 #define var_CreateGetNonEmptyStringCommand(a,b) var_CreateGetNonEmptyStringCommand( VLC_OBJECT(a),b)
637 static inline int var_CountChoices( vlc_object_t *p_obj, const char *psz_name )
640 if( var_Change( p_obj, psz_name, VLC_VAR_CHOICESCOUNT, &count, NULL ) )
644 #define var_CountChoices(a,b) var_CountChoices( VLC_OBJECT(a),b)
647 static inline bool var_ToggleBool( vlc_object_t *p_obj, const char *psz_name )
650 var_GetAndSet( p_obj, psz_name, VLC_VAR_BOOL_TOGGLE, &val );
653 #define var_ToggleBool(a,b) var_ToggleBool( VLC_OBJECT(a),b )
657 static inline bool var_InheritBool( vlc_object_t *obj, const char *name )
661 if( var_Inherit( obj, name, VLC_VAR_BOOL, &val ) )
665 #define var_InheritBool(o, n) var_InheritBool(VLC_OBJECT(o), n)
668 static inline int var_InheritInteger( vlc_object_t *obj, const char *name )
672 if( var_Inherit( obj, name, VLC_VAR_INTEGER, &val ) )
676 #define var_InheritInteger(o, n) var_InheritInteger(VLC_OBJECT(o), n)
679 static inline float var_InheritFloat( vlc_object_t *obj, const char *name )
683 if( var_Inherit( obj, name, VLC_VAR_FLOAT, &val ) )
687 #define var_InheritFloat(o, n) var_InheritFloat(VLC_OBJECT(o), n)
689 LIBVLC_USED LIBVLC_MALLOC
690 static inline char *var_InheritString( vlc_object_t *obj, const char *name )
694 if( var_Inherit( obj, name, VLC_VAR_STRING, &val ) )
695 val.psz_string = NULL;
696 else if( val.psz_string && !*val.psz_string )
698 free( val.psz_string );
699 val.psz_string = NULL;
701 return val.psz_string;
703 #define var_InheritString(o, n) var_InheritString(VLC_OBJECT(o), n)
705 static inline mtime_t var_InheritTime( vlc_object_t *obj, const char *name )
709 if( var_Inherit( obj, name, VLC_VAR_TIME, &val ) )
713 #define var_InheritTime(o, n) var_InheritTime(VLC_OBJECT(o), n)
715 #define var_GetInteger(a,b) var_GetInteger( VLC_OBJECT(a),b)
716 #define var_GetBool(a,b) var_GetBool( VLC_OBJECT(a),b)
717 #define var_GetTime(a,b) var_GetTime( VLC_OBJECT(a),b)
718 #define var_GetFloat(a,b) var_GetFloat( VLC_OBJECT(a),b)
719 #define var_GetString(a,b) var_GetString( VLC_OBJECT(a),b)
720 #define var_GetNonEmptyString(a,b) var_GetNonEmptyString( VLC_OBJECT(a),b)
721 #define var_GetAddress(a,b) var_GetAddress( VLC_OBJECT(a),b)
726 #endif /* _VLC_VARIABLES_H */