1 /*****************************************************************************
2 * variables.c: routines for object variables handling
3 *****************************************************************************
4 * Copyright (C) 2002-2009 VLC authors and VideoLAN
7 * Authors: Samuel Hocevar <sam@zoy.org>
9 * This program is free software; you can redistribute it and/or modify it
10 * under the terms of the GNU Lesser General Public License as published by
11 * the Free Software Foundation; either version 2.1 of the License, or
12 * (at your option) any later version.
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU Lesser General Public License for more details.
19 * You should have received a copy of the GNU Lesser General Public License
20 * along with this program; if not, write to the Free Software Foundation,
21 * Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
22 *****************************************************************************/
24 /*****************************************************************************
26 *****************************************************************************/
41 #include <vlc_common.h>
42 #include <vlc_charset.h>
44 #include "variables.h"
45 #include "config/configuration.h"
47 /*****************************************************************************
49 *****************************************************************************/
50 struct callback_entry_t
52 vlc_callback_t pf_callback;
56 /*****************************************************************************
57 * Local comparison functions, returns 0 if v == w, < 0 if v < w, > 0 if v > w
58 *****************************************************************************/
59 static int CmpBool( vlc_value_t v, vlc_value_t w )
61 return v.b_bool ? w.b_bool ? 0 : 1 : w.b_bool ? -1 : 0;
64 static int CmpInt( vlc_value_t v, vlc_value_t w )
66 return v.i_int == w.i_int ? 0 : v.i_int > w.i_int ? 1 : -1;
69 static int CmpTime( vlc_value_t v, vlc_value_t w )
71 return v.i_time == w.i_time ? 0 : v.i_time > w.i_time ? 1 : -1;
74 static int CmpString( vlc_value_t v, vlc_value_t w )
77 return !w.psz_string ? 0 : -1;
79 return !w.psz_string ? 1 : strcmp( v.psz_string, w.psz_string );
81 static int CmpFloat( vlc_value_t v, vlc_value_t w ) { return v.f_float == w.f_float ? 0 : v.f_float > w.f_float ? 1 : -1; }
82 static int CmpAddress( vlc_value_t v, vlc_value_t w ) { return v.p_address == w.p_address ? 0 : v.p_address > w.p_address ? 1 : -1; }
84 /*****************************************************************************
85 * Local duplication functions, and local deallocation functions
86 *****************************************************************************/
87 static void DupDummy( vlc_value_t *p_val ) { (void)p_val; /* unused */ }
88 static void DupString( vlc_value_t *p_val )
90 p_val->psz_string = strdup( p_val->psz_string ? p_val->psz_string : "" );
93 static void FreeDummy( vlc_value_t *p_val ) { (void)p_val; /* unused */ }
94 static void FreeString( vlc_value_t *p_val ) { free( p_val->psz_string ); }
96 static void FreeList( vlc_value_t *p_val )
99 for( i = 0; i < p_val->p_list->i_count; i++ )
101 switch( p_val->p_list->pi_types[i] & VLC_VAR_CLASS )
104 FreeString( &p_val->p_list->p_values[i] );
111 if( p_val->p_list->i_count )
113 free( p_val->p_list->p_values );
114 free( p_val->p_list->pi_types );
116 free( p_val->p_list );
119 static const struct variable_ops_t
120 void_ops = { NULL, DupDummy, FreeDummy, },
121 addr_ops = { CmpAddress, DupDummy, FreeDummy, },
122 bool_ops = { CmpBool, DupDummy, FreeDummy, },
123 float_ops = { CmpFloat, DupDummy, FreeDummy, },
124 int_ops = { CmpInt, DupDummy, FreeDummy, },
125 string_ops = { CmpString, DupString, FreeString, },
126 time_ops = { CmpTime, DupDummy, FreeDummy, },
127 coords_ops = { NULL, DupDummy, FreeDummy, };
129 /*****************************************************************************
131 *****************************************************************************/
132 static void WaitUnused ( vlc_object_t *, variable_t * );
134 static void CheckValue ( variable_t *, vlc_value_t * );
136 static int TriggerCallback( vlc_object_t *, variable_t *, const char *,
139 static int varcmp( const void *a, const void *b )
141 const variable_t *va = a, *vb = b;
143 /* psz_name must be first */
144 assert( va == (const void *)&va->psz_name );
145 return strcmp( va->psz_name, vb->psz_name );
148 static variable_t *Lookup( vlc_object_t *obj, const char *psz_name )
150 vlc_object_internals_t *priv = vlc_internals( obj );
153 vlc_assert_locked( &priv->var_lock );
154 pp_var = tfind( &psz_name, &priv->var_root, varcmp );
155 return (pp_var != NULL) ? *pp_var : NULL;
158 static void Destroy( variable_t *p_var )
160 p_var->ops->pf_free( &p_var->val );
161 if( p_var->choices.i_count )
163 for( int i = 0 ; i < p_var->choices.i_count ; i++ )
165 p_var->ops->pf_free( &p_var->choices.p_values[i] );
166 free( p_var->choices_text.p_values[i].psz_string );
168 free( p_var->choices.p_values );
169 free( p_var->choices_text.p_values );
172 callback_table_t *p_table = &p_var->value_callbacks;
173 for (int i = 0; i < p_table->i_entries; i++)
175 const char *file = "?", *symbol = "?";
176 const void *addr = p_table->p_entries[i].pf_callback;
180 if (dladdr (addr, &info))
182 if (info.dli_fname) file = info.dli_fname;
183 if (info.dli_sname) symbol = info.dli_sname;
186 fprintf (stderr, "Error: callback on \"%s\" dangling %s(%s)[%p]\n",
187 p_var->psz_name, file, symbol, addr);
191 free( p_var->psz_name );
192 free( p_var->psz_text );
193 free( p_var->value_callbacks.p_entries );
199 * Initialize a vlc variable
201 * We hash the given string and insert it into the sorted list. The insertion
202 * may require slow memory copies, but think about what we gain in the log(n)
203 * lookup phase when setting/getting the variable value!
205 * \param p_this The object in which to create the variable
206 * \param psz_name The name of the variable
207 * \param i_type The variables type. Must be one of \ref var_type combined with
208 * zero or more \ref var_flags
210 int var_Create( vlc_object_t *p_this, const char *psz_name, int i_type )
214 variable_t *p_var = calloc( 1, sizeof( *p_var ) );
218 p_var->psz_name = strdup( psz_name );
219 p_var->psz_text = NULL;
221 p_var->i_type = i_type & ~VLC_VAR_DOINHERIT;
225 p_var->i_default = -1;
226 p_var->choices.i_count = 0;
227 p_var->choices.p_values = NULL;
228 p_var->choices_text.i_count = 0;
229 p_var->choices_text.p_values = NULL;
231 p_var->b_incallback = false;
232 p_var->value_callbacks = (callback_table_t){ 0 };
234 /* Always initialize the variable, even if it is a list variable; this
235 * will lead to errors if the variable is not initialized, but it will
236 * not cause crashes in the variable handling. */
237 switch( i_type & VLC_VAR_CLASS )
240 p_var->ops = &bool_ops;
241 p_var->val.b_bool = false;
243 case VLC_VAR_INTEGER:
244 p_var->ops = &int_ops;
245 p_var->val.i_int = 0;
248 p_var->ops = &string_ops;
249 p_var->val.psz_string = NULL;
252 p_var->ops = &float_ops;
253 p_var->val.f_float = 0.0;
256 p_var->ops = &time_ops;
257 p_var->val.i_time = 0;
260 p_var->ops = &coords_ops;
261 p_var->val.coords.x = p_var->val.coords.y = 0;
263 case VLC_VAR_ADDRESS:
264 p_var->ops = &addr_ops;
265 p_var->val.p_address = NULL;
268 p_var->ops = &void_ops;
274 if( (i_type & VLC_VAR_DOINHERIT)
275 && var_Inherit( p_this, psz_name, i_type, &p_var->val ) == 0 )
277 if( i_type & VLC_VAR_HASCHOICE )
279 /* We must add the inherited value to our choice list */
280 p_var->i_default = 0;
282 INSERT_ELEM( p_var->choices.p_values, p_var->choices.i_count,
284 INSERT_ELEM( p_var->choices_text.p_values,
285 p_var->choices_text.i_count, 0, p_var->val );
286 p_var->ops->pf_dup( &p_var->choices.p_values[0] );
287 p_var->choices_text.p_values[0].psz_string = NULL;
291 vlc_object_internals_t *p_priv = vlc_internals( p_this );
292 variable_t **pp_var, *p_oldvar;
293 int ret = VLC_SUCCESS;
295 vlc_mutex_lock( &p_priv->var_lock );
297 pp_var = tsearch( p_var, &p_priv->var_root, varcmp );
298 if( unlikely(pp_var == NULL) )
300 else if( (p_oldvar = *pp_var) == p_var ) /* Variable create */
301 p_var = NULL; /* Variable created */
302 else /* Variable already exists */
304 assert (((i_type ^ p_oldvar->i_type) & VLC_VAR_CLASS) == 0);
306 p_oldvar->i_type |= i_type & (VLC_VAR_ISCOMMAND|VLC_VAR_HASCHOICE);
308 vlc_mutex_unlock( &p_priv->var_lock );
310 /* If we did not need to create a new variable, free everything... */
318 * Destroy a vlc variable
320 * Look for the variable and destroy it if it is found. As in var_Create we
321 * do a call to memmove() but we have performance counterparts elsewhere.
323 * \param p_this The object that holds the variable
324 * \param psz_name The name of the variable
326 int var_Destroy( vlc_object_t *p_this, const char *psz_name )
332 vlc_object_internals_t *p_priv = vlc_internals( p_this );
334 vlc_mutex_lock( &p_priv->var_lock );
336 p_var = Lookup( p_this, psz_name );
339 vlc_mutex_unlock( &p_priv->var_lock );
343 WaitUnused( p_this, p_var );
345 if( --p_var->i_usage == 0 )
346 tdelete( p_var, &p_priv->var_root, varcmp );
349 vlc_mutex_unlock( &p_priv->var_lock );
356 static void CleanupVar( void *var )
361 void var_DestroyAll( vlc_object_t *obj )
363 vlc_object_internals_t *priv = vlc_internals( obj );
365 tdestroy( priv->var_root, CleanupVar );
366 priv->var_root = NULL;
371 * Perform an action on a variable
373 * \param p_this The object that holds the variable
374 * \param psz_name The name of the variable
375 * \param i_action The action to perform. Must be one of \ref var_action
376 * \param p_val First action parameter
377 * \param p_val2 Second action parameter
379 int var_Change( vlc_object_t *p_this, const char *psz_name,
380 int i_action, vlc_value_t *p_val, vlc_value_t *p_val2 )
382 int ret = VLC_SUCCESS;
389 vlc_object_internals_t *p_priv = vlc_internals( p_this );
391 vlc_mutex_lock( &p_priv->var_lock );
393 p_var = Lookup( p_this, psz_name );
396 vlc_mutex_unlock( &p_priv->var_lock );
403 if( p_var->i_type & VLC_VAR_HASMIN )
405 p_var->ops->pf_free( &p_var->min );
407 p_var->i_type |= VLC_VAR_HASMIN;
409 p_var->ops->pf_dup( &p_var->min );
410 CheckValue( p_var, &p_var->val );
413 if( p_var->i_type & VLC_VAR_HASMIN )
419 if( p_var->i_type & VLC_VAR_HASMAX )
421 p_var->ops->pf_free( &p_var->max );
423 p_var->i_type |= VLC_VAR_HASMAX;
425 p_var->ops->pf_dup( &p_var->max );
426 CheckValue( p_var, &p_var->val );
429 if( p_var->i_type & VLC_VAR_HASMAX )
434 case VLC_VAR_SETSTEP:
435 if( p_var->i_type & VLC_VAR_HASSTEP )
437 p_var->ops->pf_free( &p_var->step );
439 p_var->i_type |= VLC_VAR_HASSTEP;
440 p_var->step = *p_val;
441 p_var->ops->pf_dup( &p_var->step );
442 CheckValue( p_var, &p_var->val );
444 case VLC_VAR_GETSTEP:
445 if( p_var->i_type & VLC_VAR_HASSTEP )
446 *p_val = p_var->step;
450 case VLC_VAR_ADDCHOICE:
452 int i = p_var->choices.i_count;
454 INSERT_ELEM( p_var->choices.p_values, p_var->choices.i_count,
456 INSERT_ELEM( p_var->choices_text.p_values,
457 p_var->choices_text.i_count, i, *p_val );
458 p_var->ops->pf_dup( &p_var->choices.p_values[i] );
459 p_var->choices_text.p_values[i].psz_string =
460 ( p_val2 && p_val2->psz_string ) ?
461 strdup( p_val2->psz_string ) : NULL;
463 CheckValue( p_var, &p_var->val );
466 case VLC_VAR_DELCHOICE:
470 for( i = 0 ; i < p_var->choices.i_count ; i++ )
471 if( p_var->ops->pf_cmp( p_var->choices.p_values[i], *p_val ) == 0 )
474 if( i == p_var->choices.i_count )
477 vlc_mutex_unlock( &p_priv->var_lock );
481 if( p_var->i_default > i )
483 else if( p_var->i_default == i )
484 p_var->i_default = -1;
486 p_var->ops->pf_free( &p_var->choices.p_values[i] );
487 free( p_var->choices_text.p_values[i].psz_string );
488 REMOVE_ELEM( p_var->choices.p_values, p_var->choices.i_count, i );
489 REMOVE_ELEM( p_var->choices_text.p_values,
490 p_var->choices_text.i_count, i );
492 CheckValue( p_var, &p_var->val );
495 case VLC_VAR_CHOICESCOUNT:
496 p_val->i_int = p_var->choices.i_count;
498 case VLC_VAR_CLEARCHOICES:
499 for( int i = 0 ; i < p_var->choices.i_count ; i++ )
500 p_var->ops->pf_free( &p_var->choices.p_values[i] );
501 for( int i = 0 ; i < p_var->choices_text.i_count ; i++ )
502 free( p_var->choices_text.p_values[i].psz_string );
504 if( p_var->choices.i_count ) free( p_var->choices.p_values );
505 if( p_var->choices_text.i_count ) free( p_var->choices_text.p_values );
507 p_var->choices.i_count = 0;
508 p_var->choices.p_values = NULL;
509 p_var->choices_text.i_count = 0;
510 p_var->choices_text.p_values = NULL;
511 p_var->i_default = -1;
513 case VLC_VAR_SETDEFAULT:
516 /* FIXME: the list is sorted, dude. Use something cleverer. */
517 for( i = 0 ; i < p_var->choices.i_count ; i++ )
518 if( p_var->ops->pf_cmp( p_var->choices.p_values[i], *p_val ) == 0 )
521 if( i == p_var->choices.i_count )
525 p_var->i_default = i;
526 CheckValue( p_var, &p_var->val );
529 case VLC_VAR_SETVALUE:
530 /* Duplicate data if needed */
532 p_var->ops->pf_dup( &newval );
533 /* Backup needed stuff */
535 /* Check boundaries and list */
536 CheckValue( p_var, &newval );
537 /* Set the variable */
539 /* Free data if needed */
540 p_var->ops->pf_free( &oldval );
542 case VLC_VAR_GETCHOICES:
543 case VLC_VAR_GETLIST:
544 p_val->p_list = malloc( sizeof(vlc_list_t) );
545 if( p_val2 ) p_val2->p_list = malloc( sizeof(vlc_list_t) );
546 if( p_var->choices.i_count )
548 p_val->p_list->p_values = malloc( p_var->choices.i_count
549 * sizeof(vlc_value_t) );
550 p_val->p_list->pi_types = malloc( p_var->choices.i_count
554 p_val2->p_list->p_values =
555 malloc( p_var->choices.i_count * sizeof(vlc_value_t) );
556 p_val2->p_list->pi_types =
557 malloc( p_var->choices.i_count * sizeof(int) );
560 p_val->p_list->i_count = p_var->choices.i_count;
561 if( p_val2 ) p_val2->p_list->i_count = p_var->choices.i_count;
562 for( int i = 0 ; i < p_var->choices.i_count ; i++ )
564 p_val->p_list->p_values[i] = p_var->choices.p_values[i];
565 p_val->p_list->pi_types[i] = p_var->i_type;
566 p_var->ops->pf_dup( &p_val->p_list->p_values[i] );
569 p_val2->p_list->p_values[i].psz_string =
570 p_var->choices_text.p_values[i].psz_string ?
571 strdup(p_var->choices_text.p_values[i].psz_string) : NULL;
572 p_val2->p_list->pi_types[i] = VLC_VAR_STRING;
576 case VLC_VAR_SETTEXT:
577 free( p_var->psz_text );
578 if( p_val && p_val->psz_string )
579 p_var->psz_text = strdup( p_val->psz_string );
581 p_var->psz_text = NULL;
583 case VLC_VAR_GETTEXT:
584 p_val->psz_string = p_var->psz_text ? strdup( p_var->psz_text )
591 vlc_mutex_unlock( &p_priv->var_lock );
598 * Perform a Get and Set on a variable
600 * \param p_this: The object that hold the variable
601 * \param psz_name: the name of the variable
602 * \param i_action: the action to perform
603 * \param p_val: The action parameter
604 * \return vlc error codes
606 int var_GetAndSet( vlc_object_t *p_this, const char *psz_name, int i_action,
616 vlc_object_internals_t *p_priv = vlc_internals( p_this );
618 vlc_mutex_lock( &p_priv->var_lock );
619 p_var = Lookup( p_this, psz_name );
622 vlc_mutex_unlock( &p_priv->var_lock );
626 WaitUnused( p_this, p_var );
628 /* Duplicated data if needed */
629 //p_var->ops->pf_dup( &val );
631 /* Backup needed stuff */
634 /* depending of the action requiered */
637 case VLC_VAR_BOOL_TOGGLE:
638 assert( ( p_var->i_type & VLC_VAR_BOOL ) == VLC_VAR_BOOL );
639 p_var->val.b_bool = !p_var->val.b_bool;
641 case VLC_VAR_INTEGER_ADD:
642 assert( ( p_var->i_type & VLC_VAR_INTEGER ) == VLC_VAR_INTEGER );
643 p_var->val.i_int += p_val->i_int;
645 case VLC_VAR_INTEGER_OR:
646 assert( ( p_var->i_type & VLC_VAR_INTEGER ) == VLC_VAR_INTEGER );
647 p_var->val.i_int |= p_val->i_int;
649 case VLC_VAR_INTEGER_NAND:
650 assert( ( p_var->i_type & VLC_VAR_INTEGER ) == VLC_VAR_INTEGER );
651 p_var->val.i_int &= ~p_val->i_int;
654 vlc_mutex_unlock( &p_priv->var_lock );
658 /* Check boundaries */
659 CheckValue( p_var, &p_var->val );
662 /* Deal with callbacks.*/
663 i_ret = TriggerCallback( p_this, p_var, psz_name, oldval );
665 vlc_mutex_unlock( &p_priv->var_lock );
672 * Request a variable's type
674 * \return The variable type if it exists, or 0 if the
675 * variable could not be found.
678 int var_Type( vlc_object_t *p_this, const char *psz_name )
685 vlc_object_internals_t *p_priv = vlc_internals( p_this );
687 vlc_mutex_lock( &p_priv->var_lock );
689 p_var = Lookup( p_this, psz_name );
691 i_type = p_var->i_type;
693 vlc_mutex_unlock( &p_priv->var_lock );
698 #undef var_SetChecked
699 int var_SetChecked( vlc_object_t *p_this, const char *psz_name,
700 int expected_type, vlc_value_t val )
702 int i_ret = VLC_SUCCESS;
708 vlc_object_internals_t *p_priv = vlc_internals( p_this );
710 vlc_mutex_lock( &p_priv->var_lock );
712 p_var = Lookup( p_this, psz_name );
715 vlc_mutex_unlock( &p_priv->var_lock );
719 assert( expected_type == 0 ||
720 (p_var->i_type & VLC_VAR_CLASS) == expected_type );
721 assert ((p_var->i_type & VLC_VAR_CLASS) != VLC_VAR_VOID);
723 WaitUnused( p_this, p_var );
725 /* Duplicate data if needed */
726 p_var->ops->pf_dup( &val );
728 /* Backup needed stuff */
731 /* Check boundaries and list */
732 CheckValue( p_var, &val );
734 /* Set the variable */
737 /* Deal with callbacks */
738 i_ret = TriggerCallback( p_this, p_var, psz_name, oldval );
740 /* Free data if needed */
741 p_var->ops->pf_free( &oldval );
743 vlc_mutex_unlock( &p_priv->var_lock );
750 * Set a variable's value
752 * \param p_this The object that hold the variable
753 * \param psz_name The name of the variable
754 * \param val the value to set
756 int var_Set( vlc_object_t *p_this, const char *psz_name, vlc_value_t val )
758 return var_SetChecked( p_this, psz_name, 0, val );
761 #undef var_GetChecked
762 int var_GetChecked( vlc_object_t *p_this, const char *psz_name,
763 int expected_type, vlc_value_t *p_val )
767 vlc_object_internals_t *p_priv = vlc_internals( p_this );
769 int err = VLC_SUCCESS;
771 vlc_mutex_lock( &p_priv->var_lock );
773 p_var = Lookup( p_this, psz_name );
776 assert( expected_type == 0 ||
777 (p_var->i_type & VLC_VAR_CLASS) == expected_type );
778 assert ((p_var->i_type & VLC_VAR_CLASS) != VLC_VAR_VOID);
780 /* Really get the variable */
783 /* Duplicate value if needed */
784 p_var->ops->pf_dup( p_val );
789 vlc_mutex_unlock( &p_priv->var_lock );
795 * Get a variable's value
797 * \param p_this The object that holds the variable
798 * \param psz_name The name of the variable
799 * \param p_val Pointer to a vlc_value_t that will hold the variable's value
800 * after the function is finished
802 int var_Get( vlc_object_t *p_this, const char *psz_name, vlc_value_t *p_val )
804 return var_GetChecked( p_this, psz_name, 0, p_val );
807 static int AddCallback( vlc_object_t *p_this, const char *psz_name,
808 callback_entry_t entry )
814 vlc_object_internals_t *p_priv = vlc_internals( p_this );
816 vlc_mutex_lock( &p_priv->var_lock );
818 p_var = Lookup( p_this, psz_name );
821 vlc_mutex_unlock( &p_priv->var_lock );
822 msg_Err( p_this, "cannot add callback %p to nonexistent "
823 "variable '%s'", entry.pf_callback, psz_name );
827 WaitUnused( p_this, p_var );
828 callback_table_t *p_table = &p_var->value_callbacks;
829 INSERT_ELEM( p_table->p_entries,
834 vlc_mutex_unlock( &p_priv->var_lock );
839 #undef var_AddCallback
841 * Register a callback in a variable
843 * We store a function pointer that will be called upon variable
846 * \param p_this The object that holds the variable
847 * \param psz_name The name of the variable
848 * \param pf_callback The function pointer
849 * \param p_data A generic pointer that will be passed as the last
850 * argument to the callback function.
852 * \warning The callback function is run in the thread that calls var_Set on
853 * the variable. Use proper locking. This thread may not have much
854 * time to spare, so keep callback functions short.
856 int var_AddCallback( vlc_object_t *p_this, const char *psz_name,
857 vlc_callback_t pf_callback, void *p_data )
859 callback_entry_t entry;
860 entry.pf_callback = pf_callback;
861 entry.p_data = p_data;
863 return AddCallback(p_this, psz_name, entry);
866 static int DelCallback( vlc_object_t *p_this, const char *psz_name,
867 callback_entry_t entry )
872 bool b_found_similar = false;
877 vlc_object_internals_t *p_priv = vlc_internals( p_this );
879 vlc_mutex_lock( &p_priv->var_lock );
881 p_var = Lookup( p_this, psz_name );
884 vlc_mutex_unlock( &p_priv->var_lock );
888 WaitUnused( p_this, p_var );
890 callback_table_t *p_table = &p_var->value_callbacks;
891 for( i_entry = p_table->i_entries ; i_entry-- ; )
893 if( p_table->p_entries[i_entry].pf_callback == entry.pf_callback
894 && p_table->p_entries[i_entry].p_data == entry.p_data )
899 else if( p_table->p_entries[i_entry].pf_callback == entry.pf_callback )
900 b_found_similar = true;
907 if( b_found_similar )
908 fprintf( stderr, "Calling var_DelCallback for '%s' with the same "
909 "function but not the same data.", psz_name );
912 vlc_mutex_unlock( &p_priv->var_lock );
916 REMOVE_ELEM( p_table->p_entries, p_table->i_entries, i_entry );
918 vlc_mutex_unlock( &p_priv->var_lock );
923 #undef var_DelCallback
925 * Remove a callback from a variable
927 * pf_callback and p_data have to be given again, because different objects
928 * might have registered the same callback function.
930 int var_DelCallback( vlc_object_t *p_this, const char *psz_name,
931 vlc_callback_t pf_callback, void *p_data )
933 callback_entry_t entry;
934 entry.pf_callback = pf_callback;
935 entry.p_data = p_data;
937 return DelCallback(p_this, psz_name, entry);
940 #undef var_TriggerCallback
942 * Trigger callback on a variable
944 * \param p_this The object that hold the variable
945 * \param psz_name The name of the variable
947 int var_TriggerCallback( vlc_object_t *p_this, const char *psz_name )
954 vlc_object_internals_t *p_priv = vlc_internals( p_this );
956 vlc_mutex_lock( &p_priv->var_lock );
958 p_var = Lookup( p_this, psz_name );
961 vlc_mutex_unlock( &p_priv->var_lock );
965 WaitUnused( p_this, p_var );
967 /* Deal with callbacks. Tell we're in a callback, release the lock,
968 * call stored functions, retake the lock. */
969 i_ret = TriggerCallback( p_this, p_var, psz_name, p_var->val );
971 vlc_mutex_unlock( &p_priv->var_lock );
975 /** Parse a stringified option
976 * This function parse a string option and create the associated object
978 * The option must be of the form "[no[-]]foo[=bar]" where foo is the
979 * option name and bar is the value of the option.
980 * \param p_obj the object in which the variable must be created
981 * \param psz_option the option to parse
982 * \param trusted whether the option is set by a trusted input or not
985 void var_OptionParse( vlc_object_t *p_obj, const char *psz_option,
988 char *psz_name, *psz_value;
993 val.psz_string = NULL;
995 /* It's too much of a hassle to remove the ':' when we parse
997 if( psz_option[0] == ':' )
1000 if( !psz_option[0] )
1003 psz_name = strdup( psz_option );
1004 if( psz_name == NULL )
1007 psz_value = strchr( psz_name, '=' );
1008 if( psz_value != NULL )
1009 *psz_value++ = '\0';
1011 i_type = config_GetType( p_obj, psz_name );
1012 if( !i_type && !psz_value )
1014 /* check for "no-foo" or "nofoo" */
1015 if( !strncmp( psz_name, "no-", 3 ) )
1017 memmove( psz_name, psz_name + 3, strlen(psz_name) + 1 - 3 );
1019 else if( !strncmp( psz_name, "no", 2 ) )
1021 memmove( psz_name, psz_name + 2, strlen(psz_name) + 1 - 2 );
1023 else goto cleanup; /* Option doesn't exist */
1026 i_type = config_GetType( p_obj, psz_name );
1028 if( !i_type ) goto cleanup; /* Option doesn't exist */
1030 if( ( i_type != VLC_VAR_BOOL ) &&
1031 ( !psz_value || !*psz_value ) ) goto cleanup; /* Invalid value */
1033 /* check if option is unsafe */
1034 if( !trusted && !config_IsSafe( psz_name ) )
1036 msg_Err( p_obj, "unsafe option \"%s\" has been ignored for "
1037 "security reasons", psz_name );
1042 /* Create the variable in the input object.
1043 * Children of the input object will be able to retreive this value
1044 * thanks to the inheritance property of the object variables. */
1045 var_Create( p_obj, psz_name, i_type );
1050 val.b_bool = !b_isno;
1053 case VLC_VAR_INTEGER:
1054 val.i_int = strtoll( psz_value, NULL, 0 );
1058 val.f_float = us_atof( psz_value );
1061 case VLC_VAR_STRING:
1062 val.psz_string = psz_value;
1069 var_Set( p_obj, psz_name, val );
1075 #undef var_LocationParse
1077 * Parses a set of colon-separated or semicolon-separated
1078 * <variable name>=<value> pairs.
1079 * Some access (or access_demux) plugins uses this scheme
1080 * in media resource location.
1081 * @note Only trusted/safe variables are allowed. This is intended.
1083 * @warning Only use this for plugins implementing VLC-specific resource
1084 * location schemes. This would not make any sense for standardized ones.
1086 * @param obj VLC object on which to set variables (and emit error messages)
1087 * @param mrl string to parse
1088 * @param pref prefix to prepend to option names in the string
1090 * @return VLC_ENOMEM on error, VLC_SUCCESS on success.
1092 int var_LocationParse (vlc_object_t *obj, const char *mrl, const char *pref)
1094 int ret = VLC_SUCCESS;
1095 size_t preflen = strlen (pref) + 1;
1097 assert(mrl != NULL);
1098 while (*mrl != '\0')
1100 mrl += strspn (mrl, ":;"); /* skip leading colon(s) */
1102 size_t len = strcspn (mrl, ":;");
1103 char *buf = malloc (preflen + len);
1105 if (likely(buf != NULL))
1107 /* NOTE: this does not support the "no-<varname>" bool syntax. */
1108 /* DO NOT use asprintf() here; it won't work! Think again. */
1109 snprintf (buf, preflen + len, "%s%s", pref, mrl);
1110 var_OptionParse (obj, buf, false);
1122 * Waits until the variable is inactive (i.e. not executing a callback)
1124 static void WaitUnused( vlc_object_t *p_this, variable_t *p_var )
1126 vlc_object_internals_t *p_priv = vlc_internals( p_this );
1128 mutex_cleanup_push( &p_priv->var_lock );
1129 while( p_var->b_incallback )
1130 vlc_cond_wait( &p_priv->var_wait, &p_priv->var_lock );
1134 /*****************************************************************************
1135 * CheckValue: check that a value is valid wrt. a variable
1136 *****************************************************************************
1137 * This function checks p_val's value against p_var's limitations such as
1138 * minimal and maximal value, step, in-list position, and modifies p_val if
1140 ****************************************************************************/
1141 static void CheckValue ( variable_t *p_var, vlc_value_t *p_val )
1143 /* Check that our variable is in the list */
1144 if( p_var->i_type & VLC_VAR_HASCHOICE && p_var->choices.i_count )
1148 /* This list is not sorted so go throug it (this is a small list) */
1149 for( i = p_var->choices.i_count ; i-- ; )
1151 if( p_var->ops->pf_cmp( *p_val, p_var->choices.p_values[i] ) == 0 )
1157 /* If not found, change it to anything vaguely valid */
1160 /* Free the old variable, get the new one, dup it */
1161 p_var->ops->pf_free( p_val );
1162 *p_val = p_var->choices.p_values[p_var->i_default >= 0
1163 ? p_var->i_default : 0 ];
1164 p_var->ops->pf_dup( p_val );
1168 /* Check that our variable is within the bounds */
1169 switch( p_var->i_type & VLC_VAR_TYPE )
1171 case VLC_VAR_INTEGER:
1172 if( p_var->i_type & VLC_VAR_HASSTEP && p_var->step.i_int
1173 && (p_val->i_int % p_var->step.i_int) )
1175 p_val->i_int = (p_val->i_int + (p_var->step.i_int / 2))
1176 / p_var->step.i_int * p_var->step.i_int;
1178 if( p_var->i_type & VLC_VAR_HASMIN
1179 && p_val->i_int < p_var->min.i_int )
1181 p_val->i_int = p_var->min.i_int;
1183 if( p_var->i_type & VLC_VAR_HASMAX
1184 && p_val->i_int > p_var->max.i_int )
1186 p_val->i_int = p_var->max.i_int;
1190 if( p_var->i_type & VLC_VAR_HASSTEP && p_var->step.f_float )
1192 float f_round = p_var->step.f_float * (float)(int)( 0.5 +
1193 p_val->f_float / p_var->step.f_float );
1194 if( p_val->f_float != f_round )
1196 p_val->f_float = f_round;
1199 if( p_var->i_type & VLC_VAR_HASMIN
1200 && p_val->f_float < p_var->min.f_float )
1202 p_val->f_float = p_var->min.f_float;
1204 if( p_var->i_type & VLC_VAR_HASMAX
1205 && p_val->f_float > p_var->max.f_float )
1207 p_val->f_float = p_var->max.f_float;
1217 * Finds the value of a variable. If the specified object does not hold a
1218 * variable with the specified name, try the parent object, and iterate until
1219 * the top of the tree. If no match is found, the value is read from the
1222 int var_Inherit( vlc_object_t *p_this, const char *psz_name, int i_type,
1223 vlc_value_t *p_val )
1225 i_type &= VLC_VAR_CLASS;
1226 for( vlc_object_t *obj = p_this; obj != NULL; obj = obj->p_parent )
1228 if( var_GetChecked( obj, psz_name, i_type, p_val ) == VLC_SUCCESS )
1232 /* else take value from config */
1233 switch( i_type & VLC_VAR_CLASS )
1235 case VLC_VAR_STRING:
1236 p_val->psz_string = config_GetPsz( p_this, psz_name );
1237 if( !p_val->psz_string ) p_val->psz_string = strdup("");
1240 p_val->f_float = config_GetFloat( p_this, psz_name );
1242 case VLC_VAR_INTEGER:
1243 p_val->i_int = config_GetInt( p_this, psz_name );
1246 p_val->b_bool = config_GetInt( p_this, psz_name );
1250 case VLC_VAR_ADDRESS:
1258 * It inherits a string as an unsigned rational number (it also accepts basic
1261 * It returns an error if the rational number cannot be parsed (0/0 is valid).
1262 * The rational is already reduced.
1264 int (var_InheritURational)(vlc_object_t *object,
1265 unsigned *num, unsigned *den,
1273 char *tmp = var_InheritString(object, var);
1278 unsigned n = strtol(tmp, &next, 0);
1279 unsigned d = strtol(*next ? &next[1] : "0", NULL, 0);
1282 /* Interpret as a float number */
1283 double r = us_atof(tmp);
1295 } else if ( *next == '\0' ) {
1296 /* plain integer given */
1302 vlc_ureduce(num, den, n, d, 0);
1309 return VLC_EGENERIC;
1312 /**********************************************************************
1313 * Trigger the callbacks.
1314 * Tell we're in a callback, release the lock, call stored functions,
1316 **********************************************************************/
1317 static int TriggerCallback( vlc_object_t *p_this, variable_t *p_var,
1318 const char *psz_name, vlc_value_t oldval )
1322 callback_table_t *p_table = &p_var->value_callbacks;
1323 int i_entries = p_table->i_entries;
1324 if( i_entries == 0 )
1327 callback_entry_t *p_entries = p_table->p_entries;
1328 vlc_object_internals_t *p_priv = vlc_internals( p_this );
1330 assert( !p_var->b_incallback );
1331 p_var->b_incallback = true;
1332 vlc_mutex_unlock( &p_priv->var_lock );
1334 /* The real calls */
1335 for( ; i_entries-- ; )
1337 p_entries[i_entries].pf_callback( p_this, psz_name, oldval, p_var->val,
1338 p_entries[i_entries].p_data );
1341 vlc_mutex_lock( &p_priv->var_lock );
1342 p_var->b_incallback = false;
1343 vlc_cond_broadcast( &p_priv->var_wait );
1349 * Free a list and the associated strings
1350 * @param p_val: the list variable
1351 * @param p_val2: the variable associated or NULL
1353 void var_FreeList( vlc_value_t *p_val, vlc_value_t *p_val2 )
1356 if( p_val2 && p_val2->p_list )
1358 for( int i = 0; i < p_val2->p_list->i_count; i++ )
1359 free( p_val2->p_list->p_values[i].psz_string );
1360 if( p_val2->p_list->i_count )
1362 free( p_val2->p_list->p_values );
1363 free( p_val2->p_list->pi_types );
1365 free( p_val2->p_list );