1 /*****************************************************************************
2 * variables.c: routines for object variables handling
3 *****************************************************************************
4 * Copyright (C) 2002-2009 the VideoLAN team
7 * Authors: Samuel Hocevar <sam@zoy.org>
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 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 General Public License for more details.
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
22 *****************************************************************************/
24 /*****************************************************************************
26 *****************************************************************************/
31 #include <vlc_common.h>
32 #include <vlc_charset.h>
33 #include "variables.h"
39 /*****************************************************************************
41 *****************************************************************************/
42 struct callback_entry_t
44 vlc_callback_t pf_callback;
48 /*****************************************************************************
49 * Local comparison functions, returns 0 if v == w, < 0 if v < w, > 0 if v > w
50 *****************************************************************************/
51 static int CmpBool( vlc_value_t v, vlc_value_t w ) { return v.b_bool ? w.b_bool ? 0 : 1 : w.b_bool ? -1 : 0; }
52 static int CmpInt( vlc_value_t v, vlc_value_t w ) { return v.i_int == w.i_int ? 0 : v.i_int > w.i_int ? 1 : -1; }
53 static int CmpTime( vlc_value_t v, vlc_value_t w )
55 return v.i_time == w.i_time ? 0 : v.i_time > w.i_time ? 1 : -1;
57 static int CmpString( vlc_value_t v, vlc_value_t w )
60 return !w.psz_string ? 0 : -1;
62 return !w.psz_string ? 1 : strcmp( v.psz_string, w.psz_string );
64 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; }
65 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; }
67 /*****************************************************************************
68 * Local duplication functions, and local deallocation functions
69 *****************************************************************************/
70 static void DupDummy( vlc_value_t *p_val ) { (void)p_val; /* unused */ }
71 static void DupString( vlc_value_t *p_val )
73 p_val->psz_string = strdup( p_val->psz_string ? p_val->psz_string : "" );
76 static void DupList( vlc_value_t *p_val )
79 vlc_list_t *p_list = malloc( sizeof(vlc_list_t) );
81 p_list->i_count = p_val->p_list->i_count;
82 if( p_val->p_list->i_count )
84 p_list->p_values = malloc( p_list->i_count * sizeof(vlc_value_t) );
85 p_list->pi_types = malloc( p_list->i_count * sizeof(int) );
89 p_list->p_values = NULL;
90 p_list->pi_types = NULL;
93 for( i = 0; i < p_list->i_count; i++ )
95 p_list->p_values[i] = p_val->p_list->p_values[i];
96 p_list->pi_types[i] = p_val->p_list->pi_types[i];
97 switch( p_val->p_list->pi_types[i] & VLC_VAR_CLASS )
101 DupString( &p_list->p_values[i] );
108 p_val->p_list = p_list;
111 static void FreeDummy( vlc_value_t *p_val ) { (void)p_val; /* unused */ }
112 static void FreeString( vlc_value_t *p_val ) { free( p_val->psz_string ); }
113 static void FreeMutex( vlc_value_t *p_val ) { vlc_mutex_destroy( (vlc_mutex_t*)p_val->p_address ); free( p_val->p_address ); }
115 static void FreeList( vlc_value_t *p_val )
118 for( i = 0; i < p_val->p_list->i_count; i++ )
120 switch( p_val->p_list->pi_types[i] & VLC_VAR_CLASS )
123 FreeString( &p_val->p_list->p_values[i] );
126 FreeMutex( &p_val->p_list->p_values[i] );
133 if( p_val->p_list->i_count )
135 free( p_val->p_list->p_values );
136 free( p_val->p_list->pi_types );
138 free( p_val->p_list );
141 static const struct variable_ops_t
142 void_ops = { NULL, DupDummy, FreeDummy, },
143 addr_ops = { CmpAddress, DupDummy, FreeDummy, },
144 bool_ops = { CmpBool, DupDummy, FreeDummy, },
145 float_ops = { CmpFloat, DupDummy, FreeDummy, },
146 int_ops = { CmpInt, DupDummy, FreeDummy, },
147 list_ops = { CmpAddress, DupList, FreeList, },
148 mutex_ops = { CmpAddress, DupDummy, FreeMutex, },
149 string_ops = { CmpString, DupString, FreeString, },
150 time_ops = { CmpTime, DupDummy, FreeDummy, };
152 /*****************************************************************************
154 *****************************************************************************/
155 static int GetUnused ( vlc_object_t *, const char * );
156 static uint32_t HashString ( const char * );
157 static int Insert ( variable_t *, int, const char * );
158 static int InsertInner ( variable_t *, int, uint32_t );
159 static int Lookup ( variable_t *, size_t, const char * );
161 static void CheckValue ( variable_t *, vlc_value_t * );
163 static int InheritValue( vlc_object_t *, const char *, vlc_value_t *,
165 static int TriggerCallback( vlc_object_t *, variable_t **, const char *,
169 * Initialize a vlc variable
171 * We hash the given string and insert it into the sorted list. The insertion
172 * may require slow memory copies, but think about what we gain in the log(n)
173 * lookup phase when setting/getting the variable value!
175 * \param p_this The object in which to create the variable
176 * \param psz_name The name of the variable
177 * \param i_type The variables type. Must be one of \ref var_type combined with
178 * zero or more \ref var_flags
180 int __var_Create( vlc_object_t *p_this, const char *psz_name, int i_type )
184 static vlc_list_t dummy_null_list = {0, NULL, NULL};
188 vlc_object_internals_t *p_priv = vlc_internals( p_this );
190 vlc_mutex_lock( &p_priv->var_lock );
192 /* FIXME: if the variable already exists, we don't duplicate it. But we
193 * duplicate the lookups. It's not that serious, but if anyone finds some
194 * time to rework Insert() so that only one lookup has to be done, feel
196 i_new = Lookup( p_priv->p_vars, p_priv->i_vars, psz_name );
200 /* If the types differ, variable creation failed. */
201 if( (i_type & VLC_VAR_CLASS) != (p_priv->p_vars[i_new].i_type & VLC_VAR_CLASS) )
203 msg_Err( p_this, "Variable '%s' (0x%04x) already exist but with a different type (0x%04x)",
204 psz_name, p_priv->p_vars[i_new].i_type, i_type );
205 vlc_mutex_unlock( &p_priv->var_lock );
209 p_priv->p_vars[i_new].i_usage++;
210 p_priv->p_vars[i_new].i_type |= ( i_type & VLC_VAR_ISCOMMAND );
211 p_priv->p_vars[i_new].i_type |= ( i_type & VLC_VAR_HASCHOICE );
212 vlc_mutex_unlock( &p_priv->var_lock );
216 i_new = Insert( p_priv->p_vars, p_priv->i_vars, psz_name );
218 if( (p_priv->i_vars & 15) == 15 )
220 p_priv->p_vars = realloc( p_priv->p_vars,
221 (p_priv->i_vars+17) * sizeof(variable_t) );
224 memmove( p_priv->p_vars + i_new + 1,
225 p_priv->p_vars + i_new,
226 (p_priv->i_vars - i_new) * sizeof(variable_t) );
230 p_var = &p_priv->p_vars[i_new];
231 memset( p_var, 0, sizeof(*p_var) );
233 p_var->i_hash = HashString( psz_name );
234 p_var->psz_name = strdup( psz_name );
235 p_var->psz_text = NULL;
237 p_var->i_type = i_type & ~VLC_VAR_DOINHERIT;
241 p_var->i_default = -1;
242 p_var->choices.i_count = 0;
243 p_var->choices.p_values = NULL;
244 p_var->choices_text.i_count = 0;
245 p_var->choices_text.p_values = NULL;
247 p_var->b_incallback = false;
248 p_var->i_entries = 0;
249 p_var->p_entries = NULL;
251 /* Always initialize the variable, even if it is a list variable; this
252 * will lead to errors if the variable is not initialized, but it will
253 * not cause crashes in the variable handling. */
254 switch( i_type & VLC_VAR_CLASS )
257 p_var->ops = &bool_ops;
258 p_var->val.b_bool = false;
260 case VLC_VAR_INTEGER:
261 p_var->ops = &int_ops;
262 p_var->val.i_int = 0;
265 p_var->ops = &string_ops;
266 p_var->val.psz_string = NULL;
269 p_var->ops = &float_ops;
270 p_var->val.f_float = 0.0;
273 p_var->ops = &time_ops;
274 p_var->val.i_time = 0;
276 case VLC_VAR_ADDRESS:
277 p_var->ops = &addr_ops;
278 p_var->val.p_address = NULL;
281 p_var->ops = &mutex_ops;
282 p_var->val.p_address = malloc( sizeof(vlc_mutex_t) );
283 vlc_mutex_init( (vlc_mutex_t*)p_var->val.p_address );
286 p_var->ops = &list_ops;
287 p_var->val.p_list = &dummy_null_list;
290 p_var->ops = &void_ops;
294 /* Duplicate the default data we stored. */
295 p_var->ops->pf_dup( &p_var->val );
297 if( i_type & VLC_VAR_DOINHERIT )
301 if( InheritValue( p_this, psz_name, &val, p_var->i_type )
304 /* Free data if needed */
305 p_var->ops->pf_free( &p_var->val );
306 /* Set the variable */
309 if( i_type & VLC_VAR_HASCHOICE )
311 /* We must add the inherited value to our choice list */
312 p_var->i_default = 0;
314 INSERT_ELEM( p_var->choices.p_values, p_var->choices.i_count,
316 INSERT_ELEM( p_var->choices_text.p_values,
317 p_var->choices_text.i_count, 0, val );
318 p_var->ops->pf_dup( &p_var->choices.p_values[0] );
319 p_var->choices_text.p_values[0].psz_string = NULL;
324 vlc_mutex_unlock( &p_priv->var_lock );
330 * Destroy a vlc variable
332 * Look for the variable and destroy it if it is found. As in var_Create we
333 * do a call to memmove() but we have performance counterparts elsewhere.
335 * \param p_this The object that holds the variable
336 * \param psz_name The name of the variable
338 int __var_Destroy( vlc_object_t *p_this, const char *psz_name )
345 vlc_object_internals_t *p_priv = vlc_internals( p_this );
347 vlc_mutex_lock( &p_priv->var_lock );
349 i_var = GetUnused( p_this, psz_name );
352 vlc_mutex_unlock( &p_priv->var_lock );
356 p_var = &p_priv->p_vars[i_var];
358 if( p_var->i_usage > 1 )
361 vlc_mutex_unlock( &p_priv->var_lock );
365 /* Free value if needed */
366 p_var->ops->pf_free( &p_var->val );
368 /* Free choice list if needed */
369 if( p_var->choices.i_count )
371 for( i = 0 ; i < p_var->choices.i_count ; i++ )
373 p_var->ops->pf_free( &p_var->choices.p_values[i] );
374 free( p_var->choices_text.p_values[i].psz_string );
376 free( p_var->choices.p_values );
377 free( p_var->choices_text.p_values );
380 /* Free callbacks if needed */
381 free( p_var->p_entries );
383 free( p_var->psz_name );
384 free( p_var->psz_text );
386 memmove( p_priv->p_vars + i_var,
387 p_priv->p_vars + i_var + 1,
388 (p_priv->i_vars - i_var - 1) * sizeof(variable_t) );
390 if( (p_priv->i_vars & 15) == 0 )
392 p_priv->p_vars = realloc( p_priv->p_vars,
393 (p_priv->i_vars) * sizeof( variable_t ) );
398 vlc_mutex_unlock( &p_priv->var_lock );
404 * Perform an action on a variable
406 * \param p_this The object that holds the variable
407 * \param psz_name The name of the variable
408 * \param i_action The action to perform. Must be one of \ref var_action
409 * \param p_val First action parameter
410 * \param p_val2 Second action parameter
412 int __var_Change( vlc_object_t *p_this, const char *psz_name,
413 int i_action, vlc_value_t *p_val, vlc_value_t *p_val2 )
421 vlc_object_internals_t *p_priv = vlc_internals( p_this );
423 vlc_mutex_lock( &p_priv->var_lock );
425 i_var = Lookup( p_priv->p_vars, p_priv->i_vars, psz_name );
429 vlc_mutex_unlock( &p_priv->var_lock );
433 p_var = &p_priv->p_vars[i_var];
438 if( p_var->i_type & VLC_VAR_HASMIN )
440 p_var->ops->pf_free( &p_var->min );
442 p_var->i_type |= VLC_VAR_HASMIN;
444 p_var->ops->pf_dup( &p_var->min );
445 CheckValue( p_var, &p_var->val );
448 if( p_var->i_type & VLC_VAR_HASMIN )
454 if( p_var->i_type & VLC_VAR_HASMAX )
456 p_var->ops->pf_free( &p_var->max );
458 p_var->i_type |= VLC_VAR_HASMAX;
460 p_var->ops->pf_dup( &p_var->max );
461 CheckValue( p_var, &p_var->val );
464 if( p_var->i_type & VLC_VAR_HASMAX )
469 case VLC_VAR_SETSTEP:
470 if( p_var->i_type & VLC_VAR_HASSTEP )
472 p_var->ops->pf_free( &p_var->step );
474 p_var->i_type |= VLC_VAR_HASSTEP;
475 p_var->step = *p_val;
476 p_var->ops->pf_dup( &p_var->step );
477 CheckValue( p_var, &p_var->val );
479 case VLC_VAR_GETSTEP:
480 if( p_var->i_type & VLC_VAR_HASSTEP )
482 *p_val = p_var->step;
485 case VLC_VAR_ADDCHOICE:
486 i = p_var->choices.i_count;
488 INSERT_ELEM( p_var->choices.p_values, p_var->choices.i_count,
490 INSERT_ELEM( p_var->choices_text.p_values,
491 p_var->choices_text.i_count, i, *p_val );
492 p_var->ops->pf_dup( &p_var->choices.p_values[i] );
493 p_var->choices_text.p_values[i].psz_string =
494 ( p_val2 && p_val2->psz_string ) ?
495 strdup( p_val2->psz_string ) : NULL;
497 CheckValue( p_var, &p_var->val );
499 case VLC_VAR_DELCHOICE:
500 for( i = 0 ; i < p_var->choices.i_count ; i++ )
502 if( p_var->ops->pf_cmp( p_var->choices.p_values[i], *p_val ) == 0 )
508 if( i == p_var->choices.i_count )
511 vlc_mutex_unlock( &p_priv->var_lock );
515 if( p_var->i_default > i )
519 else if( p_var->i_default == i )
521 p_var->i_default = -1;
524 p_var->ops->pf_free( &p_var->choices.p_values[i] );
525 free( p_var->choices_text.p_values[i].psz_string );
526 REMOVE_ELEM( p_var->choices.p_values, p_var->choices.i_count, i );
527 REMOVE_ELEM( p_var->choices_text.p_values,
528 p_var->choices_text.i_count, i );
530 CheckValue( p_var, &p_var->val );
532 case VLC_VAR_CHOICESCOUNT:
533 p_val->i_int = p_var->choices.i_count;
535 case VLC_VAR_CLEARCHOICES:
536 for( i = 0 ; i < p_var->choices.i_count ; i++ )
538 p_var->ops->pf_free( &p_var->choices.p_values[i] );
540 for( i = 0 ; i < p_var->choices_text.i_count ; i++ )
541 free( p_var->choices_text.p_values[i].psz_string );
543 if( p_var->choices.i_count ) free( p_var->choices.p_values );
544 if( p_var->choices_text.i_count ) free( p_var->choices_text.p_values );
546 p_var->choices.i_count = 0;
547 p_var->choices.p_values = NULL;
548 p_var->choices_text.i_count = 0;
549 p_var->choices_text.p_values = NULL;
550 p_var->i_default = -1;
552 case VLC_VAR_SETDEFAULT:
553 /* FIXME: the list is sorted, dude. Use something cleverer. */
554 for( i = 0 ; i < p_var->choices.i_count ; i++ )
556 if( p_var->ops->pf_cmp( p_var->choices.p_values[i], *p_val ) == 0 )
562 if( i == p_var->choices.i_count )
568 p_var->i_default = i;
569 CheckValue( p_var, &p_var->val );
571 case VLC_VAR_SETVALUE:
572 /* Duplicate data if needed */
573 p_var->ops->pf_dup( p_val );
574 /* Backup needed stuff */
576 /* Check boundaries and list */
577 CheckValue( p_var, p_val );
578 /* Set the variable */
580 /* Free data if needed */
581 p_var->ops->pf_free( &oldval );
583 case VLC_VAR_GETCHOICES:
584 case VLC_VAR_GETLIST:
585 p_val->p_list = malloc( sizeof(vlc_list_t) );
586 if( p_val2 ) p_val2->p_list = malloc( sizeof(vlc_list_t) );
587 if( p_var->choices.i_count )
589 p_val->p_list->p_values = malloc( p_var->choices.i_count
590 * sizeof(vlc_value_t) );
591 p_val->p_list->pi_types = malloc( p_var->choices.i_count
595 p_val2->p_list->p_values =
596 malloc( p_var->choices.i_count * sizeof(vlc_value_t) );
597 p_val2->p_list->pi_types =
598 malloc( p_var->choices.i_count * sizeof(int) );
601 p_val->p_list->i_count = p_var->choices.i_count;
602 if( p_val2 ) p_val2->p_list->i_count = p_var->choices.i_count;
603 for( i = 0 ; i < p_var->choices.i_count ; i++ )
605 p_val->p_list->p_values[i] = p_var->choices.p_values[i];
606 p_val->p_list->pi_types[i] = p_var->i_type;
607 p_var->ops->pf_dup( &p_val->p_list->p_values[i] );
610 p_val2->p_list->p_values[i].psz_string =
611 p_var->choices_text.p_values[i].psz_string ?
612 strdup(p_var->choices_text.p_values[i].psz_string) : NULL;
613 p_val2->p_list->pi_types[i] = VLC_VAR_STRING;
617 case VLC_VAR_SETTEXT:
618 free( p_var->psz_text );
619 if( p_val && p_val->psz_string )
620 p_var->psz_text = strdup( p_val->psz_string );
622 p_var->psz_text = NULL;
624 case VLC_VAR_GETTEXT:
625 p_val->psz_string = p_var->psz_text ? strdup( p_var->psz_text )
628 case VLC_VAR_INHERITVALUE:
632 if( InheritValue( p_this,
633 p_val2 ? p_val2->psz_string : psz_name,
634 &val, p_var->i_type )
637 /* Duplicate already done */
639 /* Backup needed stuff */
641 /* Check boundaries and list */
642 CheckValue( p_var, &val );
643 /* Set the variable */
645 /* Free data if needed */
646 p_var->ops->pf_free( &oldval );
652 p_var->ops->pf_dup( p_val );
657 case VLC_VAR_SETISCOMMAND:
658 p_var->i_type |= VLC_VAR_ISCOMMAND;
665 vlc_mutex_unlock( &p_priv->var_lock );
672 * Perform a Get and Set on a variable
674 * \param p_this: The object that hold the variable
675 * \param psz_name: the name of the variable
676 * \param i_action: the action to perform
677 * \param p_val: The action parameter
678 * \return vlc error codes
680 int __var_GetAndSet( vlc_object_t *p_this, const char *psz_name, int i_action,
684 int i_ret = VLC_SUCCESS;
690 vlc_object_internals_t *p_priv = vlc_internals( p_this );
692 vlc_mutex_lock( &p_priv->var_lock );
693 i_var = GetUnused( p_this, psz_name );
696 vlc_mutex_unlock( &p_priv->var_lock );
700 p_var = &p_priv->p_vars[i_var];
702 /* Duplicated data if needed */
703 //p_var->ops->pf_dup( &val );
705 /* Backup needed stuff */
708 /* depending of the action requiered */
711 case VLC_VAR_TOGGLE_BOOL:
712 assert( ( p_var->i_type & VLC_VAR_BOOL ) == VLC_VAR_BOOL );
713 p_var->val.b_bool = !p_var->val.b_bool;
715 case VLC_VAR_INTEGER_INCDEC:
716 assert( ( p_var->i_type & VLC_VAR_INTEGER ) == VLC_VAR_INTEGER );
717 p_var->val.i_int += val.i_int;
720 vlc_mutex_unlock( &p_priv->var_lock );
724 /* Check boundaries */
725 CheckValue( p_var, &p_var->val );
727 /* Deal with callbacks.*/
728 if( p_var->i_entries )
729 i_ret = TriggerCallback( p_this, &p_var, psz_name, oldval );
731 vlc_mutex_unlock( &p_priv->var_lock );
738 * Request a variable's type
740 * \return The variable type if it exists, or 0 if the
741 * variable could not be found.
744 int __var_Type( vlc_object_t *p_this, const char *psz_name )
750 vlc_object_internals_t *p_priv = vlc_internals( p_this );
752 vlc_mutex_lock( &p_priv->var_lock );
754 i_var = Lookup( p_priv->p_vars, p_priv->i_vars, psz_name );
758 vlc_mutex_unlock( &p_priv->var_lock );
762 i_type = p_priv->p_vars[i_var].i_type;
764 vlc_mutex_unlock( &p_priv->var_lock );
769 int var_SetChecked( vlc_object_t *p_this, const char *psz_name,
770 int expected_type, vlc_value_t val )
773 int i_ret = VLC_SUCCESS;
779 vlc_object_internals_t *p_priv = vlc_internals( p_this );
781 vlc_mutex_lock( &p_priv->var_lock );
783 i_var = GetUnused( p_this, psz_name );
786 vlc_mutex_unlock( &p_priv->var_lock );
790 p_var = &p_priv->p_vars[i_var];
791 assert( expected_type == 0 ||
792 (p_var->i_type & VLC_VAR_CLASS) == expected_type );
794 /* Duplicate data if needed */
795 p_var->ops->pf_dup( &val );
797 /* Backup needed stuff */
800 /* Check boundaries and list */
801 CheckValue( p_var, &val );
803 /* Set the variable */
806 /* Deal with callbacks */
807 if( p_var->i_entries )
808 i_ret = TriggerCallback( p_this, &p_var, psz_name, oldval );
810 /* Free data if needed */
811 p_var->ops->pf_free( &oldval );
813 vlc_mutex_unlock( &p_priv->var_lock );
820 * Set a variable's value
822 * \param p_this The object that hold the variable
823 * \param psz_name The name of the variable
824 * \param val the value to set
826 int __var_Set( vlc_object_t *p_this, const char *psz_name, vlc_value_t val )
828 return var_SetChecked( p_this, psz_name, 0, val );
831 int var_GetChecked( vlc_object_t *p_this, const char *psz_name,
832 int expected_type, vlc_value_t *p_val )
836 vlc_object_internals_t *p_priv = vlc_internals( p_this );
837 int i_var, err = VLC_SUCCESS;
839 vlc_mutex_lock( &p_priv->var_lock );
841 i_var = Lookup( p_priv->p_vars, p_priv->i_vars, psz_name );
844 variable_t *p_var = &p_priv->p_vars[i_var];
846 assert( expected_type == 0 ||
847 (p_var->i_type & VLC_VAR_CLASS) == expected_type );
849 /* Really get the variable */
853 /* Alert if the type is VLC_VAR_VOID */
854 if( ( p_var->i_type & VLC_VAR_TYPE ) == VLC_VAR_VOID )
855 msg_Warn( p_this, "Calling var_GetVoid on the void variable '%s' (0x%04x)", psz_name, p_var->i_type );
858 /* Duplicate value if needed */
859 p_var->ops->pf_dup( p_val );
864 vlc_mutex_unlock( &p_priv->var_lock );
869 * Get a variable's value
871 * \param p_this The object that holds the variable
872 * \param psz_name The name of the variable
873 * \param p_val Pointer to a vlc_value_t that will hold the variable's value
874 * after the function is finished
876 int __var_Get( vlc_object_t *p_this, const char *psz_name, vlc_value_t *p_val )
878 return var_GetChecked( p_this, psz_name, 0, p_val );
882 * Register a callback in a variable
884 * We store a function pointer that will be called upon variable
887 * \param p_this The object that holds the variable
888 * \param psz_name The name of the variable
889 * \param pf_callback The function pointer
890 * \param p_data A generic pointer that will be passed as the last
891 * argument to the callback function.
893 * \warning The callback function is run in the thread that calls var_Set on
894 * the variable. Use proper locking. This thread may not have much
895 * time to spare, so keep callback functions short.
897 int __var_AddCallback( vlc_object_t *p_this, const char *psz_name,
898 vlc_callback_t pf_callback, void *p_data )
902 callback_entry_t entry;
906 vlc_object_internals_t *p_priv = vlc_internals( p_this );
908 entry.pf_callback = pf_callback;
909 entry.p_data = p_data;
911 vlc_mutex_lock( &p_priv->var_lock );
913 i_var = GetUnused( p_this, psz_name );
917 msg_Warn( p_this, "Failed to add a callback to the non-existing "
918 "variable '%s'", psz_name );
920 vlc_mutex_unlock( &p_priv->var_lock );
924 p_var = &p_priv->p_vars[i_var];
926 INSERT_ELEM( p_var->p_entries,
931 vlc_mutex_unlock( &p_priv->var_lock );
937 * Remove a callback from a variable
939 * pf_callback and p_data have to be given again, because different objects
940 * might have registered the same callback function.
942 int __var_DelCallback( vlc_object_t *p_this, const char *psz_name,
943 vlc_callback_t pf_callback, void *p_data )
948 bool b_found_similar = false;
953 vlc_object_internals_t *p_priv = vlc_internals( p_this );
955 vlc_mutex_lock( &p_priv->var_lock );
957 i_var = GetUnused( p_this, psz_name );
960 vlc_mutex_unlock( &p_priv->var_lock );
964 p_var = &p_priv->p_vars[i_var];
966 for( i_entry = p_var->i_entries ; i_entry-- ; )
968 if( p_var->p_entries[i_entry].pf_callback == pf_callback
969 && p_var->p_entries[i_entry].p_data == p_data )
974 else if( p_var->p_entries[i_entry].pf_callback == pf_callback )
975 b_found_similar = true;
982 if( b_found_similar )
983 fprintf( stderr, "Calling var_DelCallback for '%s' with the same "
984 "function but not the same data.", psz_name );
987 vlc_mutex_unlock( &p_priv->var_lock );
991 REMOVE_ELEM( p_var->p_entries, p_var->i_entries, i_entry );
993 vlc_mutex_unlock( &p_priv->var_lock );
999 * Trigger callback on a variable
1001 * \param p_this The object that hold the variable
1002 * \param psz_name The name of the variable
1004 int __var_TriggerCallback( vlc_object_t *p_this, const char *psz_name )
1007 int i_ret = VLC_SUCCESS;
1012 vlc_object_internals_t *p_priv = vlc_internals( p_this );
1014 vlc_mutex_lock( &p_priv->var_lock );
1016 i_var = GetUnused( p_this, psz_name );
1019 vlc_mutex_unlock( &p_priv->var_lock );
1023 p_var = &p_priv->p_vars[i_var];
1025 /* Deal with callbacks. Tell we're in a callback, release the lock,
1026 * call stored functions, retake the lock. */
1027 if( p_var->i_entries )
1028 i_ret = TriggerCallback( p_this, &p_var, psz_name, p_var->val );
1030 vlc_mutex_unlock( &p_priv->var_lock );
1034 /** Parse a stringified option
1035 * This function parse a string option and create the associated object
1037 * The option must be of the form "[no[-]]foo[=bar]" where foo is the
1038 * option name and bar is the value of the option.
1039 * \param p_obj the object in which the variable must be created
1040 * \param psz_option the option to parse
1041 * \param trusted whether the option is set by a trusted input or not
1044 void var_OptionParse( vlc_object_t *p_obj, const char *psz_option,
1047 char *psz_name, *psz_value;
1049 bool b_isno = false;
1052 val.psz_string = NULL;
1054 /* It's too much of a hassle to remove the ':' when we parse
1055 * the cmd line :) */
1056 if( psz_option[0] == ':' )
1059 if( !psz_option[0] )
1062 psz_name = strdup( psz_option );
1063 if( psz_name == NULL )
1066 psz_value = strchr( psz_name, '=' );
1067 if( psz_value != NULL )
1068 *psz_value++ = '\0';
1070 /* FIXME: :programs should be handled generically */
1071 if( !strcmp( psz_name, "programs" ) )
1072 i_type = VLC_VAR_LIST;
1074 i_type = config_GetType( p_obj, psz_name );
1076 if( !i_type && !psz_value )
1078 /* check for "no-foo" or "nofoo" */
1079 if( !strncmp( psz_name, "no-", 3 ) )
1081 memmove( psz_name, psz_name + 3, strlen(psz_name) + 1 - 3 );
1083 else if( !strncmp( psz_name, "no", 2 ) )
1085 memmove( psz_name, psz_name + 2, strlen(psz_name) + 1 - 2 );
1087 else goto cleanup; /* Option doesn't exist */
1090 i_type = config_GetType( p_obj, psz_name );
1092 if( !i_type ) goto cleanup; /* Option doesn't exist */
1094 if( ( i_type != VLC_VAR_BOOL ) &&
1095 ( !psz_value || !*psz_value ) ) goto cleanup; /* Invalid value */
1097 /* check if option is unsafe */
1100 module_config_t *p_config = config_FindConfig( p_obj, psz_name );
1101 if( !p_config || !p_config->b_safe )
1103 msg_Err( p_obj, "unsafe option \"%s\" has been ignored for "
1104 "security reasons", psz_name );
1110 /* Create the variable in the input object.
1111 * Children of the input object will be able to retreive this value
1112 * thanks to the inheritance property of the object variables. */
1113 __var_Create( p_obj, psz_name, i_type );
1118 val.b_bool = !b_isno;
1121 case VLC_VAR_INTEGER:
1122 val.i_int = strtol( psz_value, NULL, 0 );
1126 val.f_float = us_atof( psz_value );
1129 case VLC_VAR_STRING:
1130 case VLC_VAR_MODULE:
1132 case VLC_VAR_DIRECTORY:
1133 val.psz_string = psz_value;
1138 char *psz_orig, *psz_var;
1139 vlc_list_t *p_list = malloc(sizeof(vlc_list_t));
1140 val.p_list = p_list;
1141 p_list->i_count = 0;
1143 psz_var = psz_orig = strdup(psz_value);
1144 while( psz_var && *psz_var )
1146 char *psz_item = psz_var;
1148 while( *psz_var && *psz_var != ',' ) psz_var++;
1149 if( *psz_var == ',' )
1154 val2.i_int = strtol( psz_item, NULL, 0 );
1155 INSERT_ELEM( p_list->p_values, p_list->i_count,
1156 p_list->i_count, val2 );
1157 /* p_list->i_count is incremented twice by INSERT_ELEM */
1159 INSERT_ELEM( p_list->pi_types, p_list->i_count,
1160 p_list->i_count, VLC_VAR_INTEGER );
1170 __var_Set( p_obj, psz_name, val );
1172 /* If that's a list, remove all elements allocated */
1173 if( i_type == VLC_VAR_LIST )
1181 /* Following functions are local */
1183 /*****************************************************************************
1184 * GetUnused: find an unused (not in callback) variable from its name
1185 *****************************************************************************
1186 * We do i_tries tries before giving up, just in case the variable is being
1187 * modified and called from a callback.
1188 *****************************************************************************/
1189 static int GetUnused( vlc_object_t *p_this, const char *psz_name )
1193 vlc_object_internals_t *p_priv = vlc_internals( p_this );
1199 i_var = Lookup( p_priv->p_vars, p_priv->i_vars, psz_name );
1205 if( ! p_priv->p_vars[i_var].b_incallback )
1210 mutex_cleanup_push( &p_priv->var_lock );
1211 vlc_cond_wait( &p_priv->var_wait, &p_priv->var_lock );
1216 /*****************************************************************************
1217 * HashString: our cool hash function
1218 *****************************************************************************
1219 * This function is not intended to be crypto-secure, we only want it to be
1220 * fast and not suck too much. This one is pretty fast and did 0 collisions
1221 * in wenglish's dictionary.
1222 *****************************************************************************/
1223 static uint32_t HashString( const char *psz_string )
1225 uint32_t i_hash = 0;
1227 while( *psz_string )
1229 i_hash += *psz_string++;
1230 i_hash += i_hash << 10;
1231 i_hash ^= i_hash >> 8;
1237 /*****************************************************************************
1238 * Insert: find an empty slot to insert a new variable
1239 *****************************************************************************
1240 * We use a recursive inner function indexed on the hash. This function does
1241 * nothing in the rare cases where a collision may occur, see Lookup()
1242 * to see how we handle them.
1243 * XXX: does this really need to be written recursively?
1244 *****************************************************************************/
1245 static int Insert( variable_t *p_vars, int i_count, const char *psz_name )
1252 return InsertInner( p_vars, i_count, HashString( psz_name ) );
1255 static int InsertInner( variable_t *p_vars, int i_count, uint32_t i_hash )
1259 if( i_hash <= p_vars[0].i_hash )
1264 if( i_hash >= p_vars[i_count - 1].i_hash )
1269 i_middle = i_count / 2;
1271 /* We know that 0 < i_middle */
1272 if( i_hash < p_vars[i_middle].i_hash )
1274 return InsertInner( p_vars, i_middle, i_hash );
1277 /* We know that i_middle + 1 < i_count */
1278 if( i_hash > p_vars[i_middle + 1].i_hash )
1280 return i_middle + 1 + InsertInner( p_vars + i_middle + 1,
1281 i_count - i_middle - 1,
1285 return i_middle + 1;
1288 static int u32cmp( const void *key, const void *data )
1290 const variable_t *p_var = data;
1291 uint32_t hash = *(const uint32_t *)key ;
1293 if( hash > p_var->i_hash )
1295 if( hash < p_var->i_hash )
1300 /*****************************************************************************
1301 * Lookup: find an existing variable given its name
1302 *****************************************************************************
1303 * We use a recursive inner function indexed on the hash. Care is taken of
1304 * possible hash collisions.
1305 *****************************************************************************/
1306 static int Lookup( variable_t *p_vars, size_t i_count, const char *psz_name )
1311 i_hash = HashString( psz_name );
1312 p_var = bsearch( &i_hash, p_vars, i_count, sizeof( *p_var ), u32cmp );
1314 /* Hash not found */
1318 assert( i_count > 0 );
1320 /* Find the first entry with the right hash */
1321 while( (p_var > p_vars) && (i_hash == p_var[-1].i_hash) )
1324 assert( p_var->i_hash == i_hash );
1326 /* Hash collision should be very unlikely, but we cannot guarantee
1327 * it will never happen. So we do an exhaustive search amongst all
1328 * entries with the same hash. Typically, there is only one anyway. */
1329 for( variable_t *p_end = p_vars + i_count;
1330 (p_var < p_end) && (i_hash == p_var->i_hash);
1333 if( !strcmp( psz_name, p_var->psz_name ) )
1334 return p_var - p_vars;
1337 /* Hash found, but entry not found */
1341 /*****************************************************************************
1342 * CheckValue: check that a value is valid wrt. a variable
1343 *****************************************************************************
1344 * This function checks p_val's value against p_var's limitations such as
1345 * minimal and maximal value, step, in-list position, and modifies p_val if
1347 ****************************************************************************/
1348 static void CheckValue ( variable_t *p_var, vlc_value_t *p_val )
1350 /* Check that our variable is in the list */
1351 if( p_var->i_type & VLC_VAR_HASCHOICE && p_var->choices.i_count )
1355 /* This list is not sorted so go throug it (this is a small list) */
1356 for( i = p_var->choices.i_count ; i-- ; )
1358 if( p_var->ops->pf_cmp( *p_val, p_var->choices.p_values[i] ) == 0 )
1364 /* If not found, change it to anything vaguely valid */
1367 /* Free the old variable, get the new one, dup it */
1368 p_var->ops->pf_free( p_val );
1369 *p_val = p_var->choices.p_values[p_var->i_default >= 0
1370 ? p_var->i_default : 0 ];
1371 p_var->ops->pf_dup( p_val );
1375 /* Check that our variable is within the bounds */
1376 switch( p_var->i_type & VLC_VAR_TYPE )
1378 case VLC_VAR_INTEGER:
1379 if( p_var->i_type & VLC_VAR_HASSTEP && p_var->step.i_int
1380 && (p_val->i_int % p_var->step.i_int) )
1382 p_val->i_int = (p_val->i_int + (p_var->step.i_int / 2))
1383 / p_var->step.i_int * p_var->step.i_int;
1385 if( p_var->i_type & VLC_VAR_HASMIN
1386 && p_val->i_int < p_var->min.i_int )
1388 p_val->i_int = p_var->min.i_int;
1390 if( p_var->i_type & VLC_VAR_HASMAX
1391 && p_val->i_int > p_var->max.i_int )
1393 p_val->i_int = p_var->max.i_int;
1397 if( p_var->i_type & VLC_VAR_HASSTEP && p_var->step.f_float )
1399 float f_round = p_var->step.f_float * (float)(int)( 0.5 +
1400 p_val->f_float / p_var->step.f_float );
1401 if( p_val->f_float != f_round )
1403 p_val->f_float = f_round;
1406 if( p_var->i_type & VLC_VAR_HASMIN
1407 && p_val->f_float < p_var->min.f_float )
1409 p_val->f_float = p_var->min.f_float;
1411 if( p_var->i_type & VLC_VAR_HASMAX
1412 && p_val->f_float > p_var->max.f_float )
1414 p_val->f_float = p_var->max.f_float;
1423 /*****************************************************************************
1424 * InheritValue: try to inherit the value of this variable from the same one
1425 * in our closest parent, libvlc or ultimately from the configuration.
1426 * The function should always be entered with the object var_lock locked.
1427 *****************************************************************************/
1428 static int InheritValue( vlc_object_t *p_this, const char *psz_name,
1429 vlc_value_t *p_val, int i_type )
1434 if( p_this->p_parent || ( p_this->p_libvlc && p_this != (vlc_object_t*) p_this->p_libvlc ) )
1436 vlc_object_internals_t *p_priv;
1438 if( p_this->p_parent )
1439 p_priv = vlc_internals( p_this->p_parent );
1441 p_priv = vlc_internals( p_this->p_libvlc );
1443 i_var = Lookup( p_priv->p_vars, p_priv->i_vars, psz_name );
1448 p_var = &p_priv->p_vars[i_var];
1450 /* Really get the variable */
1451 *p_val = p_var->val;
1453 /* Duplicate value if needed */
1454 p_var->ops->pf_dup( p_val );
1456 /*msg_Dbg( p_this, "Inherited value for var %s from object %s",
1457 psz_name ? psz_name : "(null)",
1458 p_this->psz_object_name
1459 ? p_this->psz_object_name : "(Unknown)" );*/
1462 else if ( p_this->p_parent ) /* We are still not there */
1463 return InheritValue( p_this->p_parent, psz_name, p_val, i_type );
1465 /* else take value from config */
1469 switch( i_type & VLC_VAR_CLASS )
1471 case VLC_VAR_STRING:
1472 p_val->psz_string = config_GetPsz( p_this, psz_name );
1473 if( !p_val->psz_string ) p_val->psz_string = strdup("");
1476 p_val->f_float = config_GetFloat( p_this, psz_name );
1478 case VLC_VAR_INTEGER:
1479 p_val->i_int = config_GetInt( p_this, psz_name );
1482 p_val->b_bool = config_GetInt( p_this, psz_name );
1486 char *psz_orig, *psz_var;
1487 vlc_list_t *p_list = malloc(sizeof(vlc_list_t));
1488 p_val->p_list = p_list;
1489 p_list->i_count = 0;
1491 psz_var = psz_orig = config_GetPsz( p_this, psz_name );
1492 while( psz_var && *psz_var )
1494 char *psz_item = psz_var;
1496 while( *psz_var && *psz_var != ',' ) psz_var++;
1497 if( *psz_var == ',' )
1502 val.i_int = strtol( psz_item, NULL, 0 );
1503 INSERT_ELEM( p_list->p_values, p_list->i_count,
1504 p_list->i_count, val );
1505 /* p_list->i_count is incremented twice by INSERT_ELEM */
1507 INSERT_ELEM( p_list->pi_types, p_list->i_count,
1508 p_list->i_count, VLC_VAR_INTEGER );
1514 msg_Warn( p_this, "Could not inherit value for var %s "
1515 "from config. Invalid Type", psz_name );
1519 /*msg_Dbg( p_this, "Inherited value for var %s from config", psz_name );*/
1524 /**********************************************************************
1525 * Trigger the callbacks.
1526 * Tell we're in a callback, release the lock, call stored functions,
1528 **********************************************************************/
1529 static int TriggerCallback( vlc_object_t *p_this, variable_t **pp_var,
1530 const char *psz_name, vlc_value_t oldval )
1533 int i_entries = (*pp_var)->i_entries;
1534 callback_entry_t *p_entries = (*pp_var)->p_entries;
1538 vlc_object_internals_t *p_priv = vlc_internals( p_this );
1540 (*pp_var)->b_incallback = true;
1541 vlc_mutex_unlock( &p_priv->var_lock );
1543 /* The real calls */
1544 for( ; i_entries-- ; )
1546 p_entries[i_entries].pf_callback( p_this, psz_name, oldval, (*pp_var)->val,
1547 p_entries[i_entries].p_data );
1550 vlc_mutex_lock( &p_priv->var_lock );
1552 i_var = Lookup( p_priv->p_vars, p_priv->i_vars, psz_name );
1555 msg_Err( p_this, "variable %s has disappeared", psz_name );
1559 *pp_var = &p_priv->p_vars[i_var];
1560 (*pp_var)->b_incallback = false;
1561 vlc_cond_broadcast( &p_priv->var_wait );
1567 /**********************************************************************
1568 * Execute a var command on an object identified by its name
1569 **********************************************************************/
1570 int __var_Command( vlc_object_t *p_this, const char *psz_name,
1571 const char *psz_cmd, const char *psz_arg, char **psz_msg )
1573 vlc_object_t *p_obj = vlc_object_find_name( p_this->p_libvlc,
1574 psz_name, FIND_CHILD );
1580 *psz_msg = strdup( "Unknown destination object." );
1584 i_type = var_Type( p_obj, psz_cmd );
1585 if( !( i_type&VLC_VAR_ISCOMMAND ) )
1587 vlc_object_release( p_obj );
1589 *psz_msg = strdup( "Variable doesn't exist or isn't a command." );
1590 return VLC_EGENERIC;
1593 i_type &= VLC_VAR_CLASS;
1596 case VLC_VAR_INTEGER:
1597 i_ret = var_SetInteger( p_obj, psz_cmd, atoi( psz_arg ) );
1600 i_ret = var_SetFloat( p_obj, psz_cmd, us_atof( psz_arg ) );
1602 case VLC_VAR_STRING:
1603 i_ret = var_SetString( p_obj, psz_cmd, psz_arg );
1606 i_ret = var_SetBool( p_obj, psz_cmd, atoi( psz_arg ) );
1609 i_ret = VLC_EGENERIC;
1613 vlc_object_release( p_obj );
1617 if( asprintf( psz_msg, "%s on object %s returned %i (%s)",
1618 psz_cmd, psz_name, i_ret, vlc_error( i_ret ) ) == -1)
1627 * Free a list and the associated strings
1628 * @param p_val: the list variable
1629 * @param p_val2: the variable associated or NULL
1631 void var_FreeList( vlc_value_t *p_val, vlc_value_t *p_val2 )
1634 if( p_val2 && p_val2->p_list )
1636 for( int i = 0; i < p_val2->p_list->i_count; i++ )
1637 free( p_val2->p_list->p_values[i].psz_string );
1638 if( p_val2->p_list->i_count )
1640 free( p_val2->p_list->p_values );
1641 free( p_val2->p_list->pi_types );
1643 free( p_val2->p_list );