1 /*****************************************************************************
2 * variables.c: routines for object variables handling
3 *****************************************************************************
4 * Copyright (C) 2002-2006 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 "variables.h"
36 #include "vlc_interface.h"
38 /*****************************************************************************
40 *****************************************************************************/
41 struct callback_entry_t
43 vlc_callback_t pf_callback;
47 /*****************************************************************************
48 * Local comparison functions, returns 0 if v == w, < 0 if v < w, > 0 if v > w
49 *****************************************************************************/
50 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; }
51 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; }
52 static int CmpTime( vlc_value_t v, vlc_value_t w )
54 return v.i_time == w.i_time ? 0 : v.i_time > w.i_time ? 1 : -1;
56 static int CmpString( vlc_value_t v, vlc_value_t w )
59 return !w.psz_string ? 0 : -1;
61 return !w.psz_string ? 1 : strcmp( v.psz_string, w.psz_string );
63 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; }
64 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; }
66 /*****************************************************************************
67 * Local duplication functions, and local deallocation functions
68 *****************************************************************************/
69 static void DupDummy( vlc_value_t *p_val ) { (void)p_val; /* unused */ }
70 static void DupString( vlc_value_t *p_val ) { if( p_val->psz_string ) p_val->psz_string = strdup( p_val->psz_string ); }
72 static void DupList( vlc_value_t *p_val )
75 vlc_list_t *p_list = malloc( sizeof(vlc_list_t) );
77 p_list->i_count = p_val->p_list->i_count;
78 if( p_val->p_list->i_count )
80 p_list->p_values = malloc( p_list->i_count * sizeof(vlc_value_t) );
81 p_list->pi_types = malloc( p_list->i_count * sizeof(int) );
85 p_list->p_values = NULL;
86 p_list->pi_types = NULL;
89 for( i = 0; i < p_list->i_count; i++ )
91 p_list->p_values[i] = p_val->p_list->p_values[i];
92 p_list->pi_types[i] = p_val->p_list->pi_types[i];
93 switch( p_val->p_list->pi_types[i] & VLC_VAR_TYPE )
97 DupString( &p_list->p_values[i] );
104 p_val->p_list = p_list;
107 static void FreeDummy( vlc_value_t *p_val ) { (void)p_val; /* unused */ }
108 static void FreeString( vlc_value_t *p_val ) { free( p_val->psz_string ); }
109 static void FreeMutex( vlc_value_t *p_val ) { vlc_mutex_destroy( (vlc_mutex_t*)p_val->p_address ); free( p_val->p_address ); }
111 static void FreeList( vlc_value_t *p_val )
114 for( i = 0; i < p_val->p_list->i_count; i++ )
116 switch( p_val->p_list->pi_types[i] & VLC_VAR_TYPE )
119 FreeString( &p_val->p_list->p_values[i] );
122 FreeMutex( &p_val->p_list->p_values[i] );
129 if( p_val->p_list->i_count )
131 free( p_val->p_list->p_values );
132 free( p_val->p_list->pi_types );
134 free( p_val->p_list );
137 /*****************************************************************************
139 *****************************************************************************/
140 static int GetUnused ( vlc_object_t *, const char * );
141 static uint32_t HashString ( const char * );
142 static int Insert ( variable_t *, int, const char * );
143 static int InsertInner ( variable_t *, int, uint32_t );
144 static int Lookup ( variable_t *, int, const char * );
145 static int LookupInner ( variable_t *, int, uint32_t );
147 static void CheckValue ( variable_t *, vlc_value_t * );
149 static int InheritValue( vlc_object_t *, const char *, vlc_value_t *,
153 * Initialize a vlc variable
155 * We hash the given string and insert it into the sorted list. The insertion
156 * may require slow memory copies, but think about what we gain in the log(n)
157 * lookup phase when setting/getting the variable value!
159 * \param p_this The object in which to create the variable
160 * \param psz_name The name of the variable
161 * \param i_type The variables type. Must be one of \ref var_type combined with
162 * zero or more \ref var_flags
164 int __var_Create( vlc_object_t *p_this, const char *psz_name, int i_type )
168 static vlc_list_t dummy_null_list = {0, NULL, NULL};
169 vlc_object_internals_t *p_priv = vlc_internals( p_this );
171 vlc_refcheck( p_this );
172 vlc_mutex_lock( &p_priv->var_lock );
174 /* FIXME: if the variable already exists, we don't duplicate it. But we
175 * duplicate the lookups. It's not that serious, but if anyone finds some
176 * time to rework Insert() so that only one lookup has to be done, feel
178 i_new = Lookup( p_priv->p_vars, p_priv->i_vars, psz_name );
182 /* If the types differ, variable creation failed. */
183 if( (i_type & ~(VLC_VAR_DOINHERIT|VLC_VAR_ISCOMMAND)) != p_priv->p_vars[i_new].i_type )
185 vlc_mutex_unlock( &p_priv->var_lock );
189 p_priv->p_vars[i_new].i_usage++;
190 if( i_type & VLC_VAR_ISCOMMAND )
191 p_priv->p_vars[i_new].i_type |= VLC_VAR_ISCOMMAND;
192 vlc_mutex_unlock( &p_priv->var_lock );
196 i_new = Insert( p_priv->p_vars, p_priv->i_vars, psz_name );
198 if( (p_priv->i_vars & 15) == 15 )
200 p_priv->p_vars = realloc( p_priv->p_vars,
201 (p_priv->i_vars+17) * sizeof(variable_t) );
204 memmove( p_priv->p_vars + i_new + 1,
205 p_priv->p_vars + i_new,
206 (p_priv->i_vars - i_new) * sizeof(variable_t) );
210 p_var = &p_priv->p_vars[i_new];
211 memset( p_var, 0, sizeof(*p_var) );
213 p_var->i_hash = HashString( psz_name );
214 p_var->psz_name = strdup( psz_name );
215 p_var->psz_text = NULL;
217 p_var->i_type = i_type & ~VLC_VAR_DOINHERIT;
218 memset( &p_var->val, 0, sizeof(vlc_value_t) );
220 p_var->pf_dup = DupDummy;
221 p_var->pf_free = FreeDummy;
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->i_entries = 0;
233 p_var->p_entries = NULL;
235 /* Always initialize the variable, even if it is a list variable; this
236 * will lead to errors if the variable is not initialized, but it will
237 * not cause crashes in the variable handling. */
238 switch( i_type & VLC_VAR_TYPE )
241 p_var->pf_cmp = CmpBool;
242 p_var->val.b_bool = false;
244 case VLC_VAR_INTEGER:
246 p_var->pf_cmp = CmpInt;
247 p_var->val.i_int = 0;
252 case VLC_VAR_DIRECTORY:
253 case VLC_VAR_VARIABLE:
254 p_var->pf_cmp = CmpString;
255 p_var->pf_dup = DupString;
256 p_var->pf_free = FreeString;
257 p_var->val.psz_string = NULL;
260 p_var->pf_cmp = CmpFloat;
261 p_var->val.f_float = 0.0;
264 p_var->pf_cmp = CmpTime;
265 p_var->val.i_time = 0;
267 case VLC_VAR_ADDRESS:
268 p_var->pf_cmp = CmpAddress;
269 p_var->val.p_address = NULL;
272 p_var->pf_cmp = CmpAddress;
273 p_var->pf_free = FreeMutex;
274 p_var->val.p_address = malloc( sizeof(vlc_mutex_t) );
275 vlc_mutex_init( (vlc_mutex_t*)p_var->val.p_address );
278 p_var->pf_cmp = CmpAddress;
279 p_var->pf_dup = DupList;
280 p_var->pf_free = FreeList;
281 p_var->val.p_list = &dummy_null_list;
285 /* Duplicate the default data we stored. */
286 p_var->pf_dup( &p_var->val );
288 if( i_type & VLC_VAR_DOINHERIT )
292 if( InheritValue( p_this, psz_name, &val, p_var->i_type )
295 /* Free data if needed */
296 p_var->pf_free( &p_var->val );
297 /* Set the variable */
300 if( i_type & VLC_VAR_HASCHOICE )
302 /* We must add the inherited value to our choice list */
303 p_var->i_default = 0;
305 INSERT_ELEM( p_var->choices.p_values, p_var->choices.i_count,
307 INSERT_ELEM( p_var->choices_text.p_values,
308 p_var->choices_text.i_count, 0, val );
309 p_var->pf_dup( &p_var->choices.p_values[0] );
310 p_var->choices_text.p_values[0].psz_string = NULL;
315 vlc_mutex_unlock( &p_priv->var_lock );
321 * Destroy a vlc variable
323 * Look for the variable and destroy it if it is found. As in var_Create we
324 * do a call to memmove() but we have performance counterparts elsewhere.
326 * \param p_this The object that holds the variable
327 * \param psz_name The name of the variable
329 int __var_Destroy( vlc_object_t *p_this, const char *psz_name )
333 vlc_object_internals_t *p_priv = vlc_internals( p_this );
335 vlc_refcheck( p_this );
336 vlc_mutex_lock( &p_priv->var_lock );
338 i_var = GetUnused( p_this, psz_name );
341 vlc_mutex_unlock( &p_priv->var_lock );
345 p_var = &p_priv->p_vars[i_var];
347 if( p_var->i_usage > 1 )
350 vlc_mutex_unlock( &p_priv->var_lock );
354 /* Free value if needed */
355 p_var->pf_free( &p_var->val );
357 /* Free choice list if needed */
358 if( p_var->choices.i_count )
360 for( i = 0 ; i < p_var->choices.i_count ; i++ )
362 p_var->pf_free( &p_var->choices.p_values[i] );
363 free( p_var->choices_text.p_values[i].psz_string );
365 free( p_var->choices.p_values );
366 free( p_var->choices_text.p_values );
369 /* Free callbacks if needed */
370 if( p_var->p_entries )
372 free( p_var->p_entries );
375 free( p_var->psz_name );
376 free( p_var->psz_text );
378 memmove( p_priv->p_vars + i_var,
379 p_priv->p_vars + i_var + 1,
380 (p_priv->i_vars - i_var - 1) * sizeof(variable_t) );
382 if( (p_priv->i_vars & 15) == 0 )
384 p_priv->p_vars = realloc( p_priv->p_vars,
385 (p_priv->i_vars) * sizeof( variable_t ) );
390 vlc_mutex_unlock( &p_priv->var_lock );
396 * Perform an action on a variable
398 * \param p_this The object that holds the variable
399 * \param psz_name The name of the variable
400 * \param i_action The action to perform. Must be one of \ref var_action
401 * \param p_val First action parameter
402 * \param p_val2 Second action parameter
404 int __var_Change( vlc_object_t *p_this, const char *psz_name,
405 int i_action, vlc_value_t *p_val, vlc_value_t *p_val2 )
410 vlc_object_internals_t *p_priv = vlc_internals( p_this );
412 vlc_refcheck( p_this );
413 vlc_mutex_lock( &p_priv->var_lock );
415 i_var = Lookup( p_priv->p_vars, p_priv->i_vars, psz_name );
419 vlc_mutex_unlock( &p_priv->var_lock );
423 p_var = &p_priv->p_vars[i_var];
428 if( p_var->i_type & VLC_VAR_HASMIN )
430 p_var->pf_free( &p_var->min );
432 p_var->i_type |= VLC_VAR_HASMIN;
434 p_var->pf_dup( &p_var->min );
435 CheckValue( p_var, &p_var->val );
438 if( p_var->i_type & VLC_VAR_HASMIN )
444 if( p_var->i_type & VLC_VAR_HASMAX )
446 p_var->pf_free( &p_var->max );
448 p_var->i_type |= VLC_VAR_HASMAX;
450 p_var->pf_dup( &p_var->max );
451 CheckValue( p_var, &p_var->val );
454 if( p_var->i_type & VLC_VAR_HASMAX )
459 case VLC_VAR_SETSTEP:
460 if( p_var->i_type & VLC_VAR_HASSTEP )
462 p_var->pf_free( &p_var->step );
464 p_var->i_type |= VLC_VAR_HASSTEP;
465 p_var->step = *p_val;
466 p_var->pf_dup( &p_var->step );
467 CheckValue( p_var, &p_var->val );
469 case VLC_VAR_GETSTEP:
470 if( p_var->i_type & VLC_VAR_HASSTEP )
472 *p_val = p_var->step;
475 case VLC_VAR_ADDCHOICE:
476 i = p_var->choices.i_count;
478 INSERT_ELEM( p_var->choices.p_values, p_var->choices.i_count,
480 INSERT_ELEM( p_var->choices_text.p_values,
481 p_var->choices_text.i_count, i, *p_val );
482 p_var->pf_dup( &p_var->choices.p_values[i] );
483 p_var->choices_text.p_values[i].psz_string =
484 ( p_val2 && p_val2->psz_string ) ?
485 strdup( p_val2->psz_string ) : NULL;
487 CheckValue( p_var, &p_var->val );
489 case VLC_VAR_DELCHOICE:
490 for( i = 0 ; i < p_var->choices.i_count ; i++ )
492 if( p_var->pf_cmp( p_var->choices.p_values[i], *p_val ) == 0 )
498 if( i == p_var->choices.i_count )
501 vlc_mutex_unlock( &p_priv->var_lock );
505 if( p_var->i_default > i )
509 else if( p_var->i_default == i )
511 p_var->i_default = -1;
514 p_var->pf_free( &p_var->choices.p_values[i] );
515 free( p_var->choices_text.p_values[i].psz_string );
516 REMOVE_ELEM( p_var->choices.p_values, p_var->choices.i_count, i );
517 REMOVE_ELEM( p_var->choices_text.p_values,
518 p_var->choices_text.i_count, i );
520 CheckValue( p_var, &p_var->val );
522 case VLC_VAR_CHOICESCOUNT:
523 p_val->i_int = p_var->choices.i_count;
525 case VLC_VAR_CLEARCHOICES:
526 for( i = 0 ; i < p_var->choices.i_count ; i++ )
528 p_var->pf_free( &p_var->choices.p_values[i] );
530 for( i = 0 ; i < p_var->choices_text.i_count ; i++ )
531 free( p_var->choices_text.p_values[i].psz_string );
533 if( p_var->choices.i_count ) free( p_var->choices.p_values );
534 if( p_var->choices_text.i_count ) free( p_var->choices_text.p_values );
536 p_var->choices.i_count = 0;
537 p_var->choices.p_values = NULL;
538 p_var->choices_text.i_count = 0;
539 p_var->choices_text.p_values = NULL;
540 p_var->i_default = -1;
542 case VLC_VAR_SETDEFAULT:
543 /* FIXME: the list is sorted, dude. Use something cleverer. */
544 for( i = 0 ; i < p_var->choices.i_count ; i++ )
546 if( p_var->pf_cmp( p_var->choices.p_values[i], *p_val ) == 0 )
552 if( i == p_var->choices.i_count )
558 p_var->i_default = i;
559 CheckValue( p_var, &p_var->val );
561 case VLC_VAR_SETVALUE:
562 /* Duplicate data if needed */
563 p_var->pf_dup( p_val );
564 /* Backup needed stuff */
566 /* Check boundaries and list */
567 CheckValue( p_var, p_val );
568 /* Set the variable */
570 /* Free data if needed */
571 p_var->pf_free( &oldval );
573 case VLC_VAR_GETCHOICES:
574 case VLC_VAR_GETLIST:
575 p_val->p_list = malloc( sizeof(vlc_list_t) );
576 if( p_val2 ) p_val2->p_list = malloc( sizeof(vlc_list_t) );
577 if( p_var->choices.i_count )
579 p_val->p_list->p_values = malloc( p_var->choices.i_count
580 * sizeof(vlc_value_t) );
581 p_val->p_list->pi_types = malloc( p_var->choices.i_count
585 p_val2->p_list->p_values =
586 malloc( p_var->choices.i_count * sizeof(vlc_value_t) );
587 p_val2->p_list->pi_types =
588 malloc( p_var->choices.i_count * sizeof(int) );
591 p_val->p_list->i_count = p_var->choices.i_count;
592 if( p_val2 ) p_val2->p_list->i_count = p_var->choices.i_count;
593 for( i = 0 ; i < p_var->choices.i_count ; i++ )
595 p_val->p_list->p_values[i] = p_var->choices.p_values[i];
596 p_val->p_list->pi_types[i] = p_var->i_type;
597 p_var->pf_dup( &p_val->p_list->p_values[i] );
600 p_val2->p_list->p_values[i].psz_string =
601 p_var->choices_text.p_values[i].psz_string ?
602 strdup(p_var->choices_text.p_values[i].psz_string) : NULL;
603 p_val2->p_list->pi_types[i] = VLC_VAR_STRING;
607 case VLC_VAR_FREELIST:
609 if( p_val2 && p_val2->p_list )
611 for( i = 0; i < p_val2->p_list->i_count; i++ )
612 free( p_val2->p_list->p_values[i].psz_string );
613 if( p_val2->p_list->i_count )
615 free( p_val2->p_list->p_values );
616 free( p_val2->p_list->pi_types );
618 free( p_val2->p_list );
621 case VLC_VAR_SETTEXT:
622 free( p_var->psz_text );
623 if( p_val && p_val->psz_string )
624 p_var->psz_text = strdup( p_val->psz_string );
626 case VLC_VAR_GETTEXT:
627 p_val->psz_string = NULL;
628 if( p_var->psz_text )
630 p_val->psz_string = strdup( p_var->psz_text );
633 case VLC_VAR_INHERITVALUE:
637 if( InheritValue( p_this,
638 p_val2 ? p_val2->psz_string : psz_name,
639 &val, p_var->i_type )
642 /* Duplicate already done */
644 /* Backup needed stuff */
646 /* Check boundaries and list */
647 CheckValue( p_var, &val );
648 /* Set the variable */
650 /* Free data if needed */
651 p_var->pf_free( &oldval );
657 p_var->pf_dup( p_val );
661 case VLC_VAR_TRIGGER_CALLBACKS:
663 /* Deal with callbacks. Tell we're in a callback, release the lock,
664 * call stored functions, retake the lock. */
665 if( p_var->i_entries )
668 int i_entries = p_var->i_entries;
669 callback_entry_t *p_entries = p_var->p_entries;
671 p_var->b_incallback = true;
672 vlc_mutex_unlock( &p_priv->var_lock );
675 for( ; i_entries-- ; )
677 p_entries[i_entries].pf_callback( p_this, psz_name, p_var->val, p_var->val,
678 p_entries[i_entries].p_data );
681 vlc_mutex_lock( &p_priv->var_lock );
683 i_var = Lookup( p_priv->p_vars, p_priv->i_vars, psz_name );
686 msg_Err( p_this, "variable %s has disappeared", psz_name );
687 vlc_mutex_unlock( &p_priv->var_lock );
691 p_var = &p_priv->p_vars[i_var];
692 p_var->b_incallback = false;
697 case VLC_VAR_SETISCOMMAND:
698 p_var->i_type |= VLC_VAR_ISCOMMAND;
705 vlc_mutex_unlock( &p_priv->var_lock );
711 * Request a variable's type
713 * \return The variable type if it exists, or 0 if the
714 * variable could not be found.
717 int __var_Type( vlc_object_t *p_this, const char *psz_name )
720 vlc_object_internals_t *p_priv = vlc_internals( p_this );
722 vlc_mutex_lock( &p_priv->var_lock );
724 i_var = Lookup( p_priv->p_vars, p_priv->i_vars, psz_name );
728 vlc_mutex_unlock( &p_priv->var_lock );
732 i_type = p_priv->p_vars[i_var].i_type;
734 vlc_mutex_unlock( &p_priv->var_lock );
740 * Set a variable's value
742 * \param p_this The object that hold the variable
743 * \param psz_name The name of the variable
744 * \param val the value to set
746 int __var_Set( vlc_object_t *p_this, const char *psz_name, vlc_value_t val )
751 vlc_object_internals_t *p_priv = vlc_internals( p_this );
753 vlc_refcheck( p_this );
754 vlc_mutex_lock( &p_priv->var_lock );
756 i_var = GetUnused( p_this, psz_name );
759 vlc_mutex_unlock( &p_priv->var_lock );
763 p_var = &p_priv->p_vars[i_var];
765 /* Duplicate data if needed */
766 p_var->pf_dup( &val );
768 /* Backup needed stuff */
771 /* Check boundaries and list */
772 CheckValue( p_var, &val );
774 /* Set the variable */
777 /* Deal with callbacks. Tell we're in a callback, release the lock,
778 * call stored functions, retake the lock. */
779 if( p_var->i_entries )
782 int i_entries = p_var->i_entries;
783 callback_entry_t *p_entries = p_var->p_entries;
785 p_var->b_incallback = true;
786 vlc_mutex_unlock( &p_priv->var_lock );
789 for( ; i_entries-- ; )
791 p_entries[i_entries].pf_callback( p_this, psz_name, oldval, val,
792 p_entries[i_entries].p_data );
795 vlc_mutex_lock( &p_priv->var_lock );
797 i_var = Lookup( p_priv->p_vars, p_priv->i_vars, psz_name );
800 msg_Err( p_this, "variable %s has disappeared", psz_name );
801 vlc_mutex_unlock( &p_priv->var_lock );
805 p_var = &p_priv->p_vars[i_var];
806 p_var->b_incallback = false;
809 /* Free data if needed */
810 p_var->pf_free( &oldval );
812 vlc_mutex_unlock( &p_priv->var_lock );
818 * Get a variable's value
820 * \param p_this The object that holds the variable
821 * \param psz_name The name of the variable
822 * \param p_val Pointer to a vlc_value_t that will hold the variable's value
823 * after the function is finished
825 int __var_Get( vlc_object_t *p_this, const char *psz_name, vlc_value_t *p_val )
829 vlc_object_internals_t *p_priv = vlc_internals( p_this );
831 vlc_refcheck( p_this );
832 vlc_mutex_lock( &p_priv->var_lock );
834 i_var = Lookup( p_priv->p_vars, p_priv->i_vars, psz_name );
838 vlc_mutex_unlock( &p_priv->var_lock );
842 p_var = &p_priv->p_vars[i_var];
844 /* Really get the variable */
847 /* Duplicate value if needed */
848 p_var->pf_dup( p_val );
850 vlc_mutex_unlock( &p_priv->var_lock );
857 * Finds a process-wide mutex, creates it if needed, and locks it.
858 * Unlock with vlc_mutex_unlock().
860 vlc_mutex_t *var_AcquireMutex( const char *name )
862 libvlc_global_data_t *p_global = vlc_global();
865 if( var_Create( p_global, name, VLC_VAR_MUTEX ) )
868 var_Get( p_global, name, &val );
869 vlc_mutex_lock( val.p_address );
870 return val.p_address;
875 * Register a callback in a variable
877 * We store a function pointer that will be called upon variable
880 * \param p_this The object that holds the variable
881 * \param psz_name The name of the variable
882 * \param pf_callback The function pointer
883 * \param p_data A generic pointer that will be passed as the last
884 * argument to the callback function.
886 * \warning The callback function is run in the thread that calls var_Set on
887 * the variable. Use proper locking. This thread may not have much
888 * time to spare, so keep callback functions short.
890 int __var_AddCallback( vlc_object_t *p_this, const char *psz_name,
891 vlc_callback_t pf_callback, void *p_data )
895 callback_entry_t entry;
896 vlc_object_internals_t *p_priv = vlc_internals( p_this );
898 vlc_refcheck( p_this );
899 entry.pf_callback = pf_callback;
900 entry.p_data = p_data;
902 vlc_mutex_lock( &p_priv->var_lock );
904 i_var = GetUnused( p_this, psz_name );
907 vlc_mutex_unlock( &p_priv->var_lock );
911 p_var = &p_priv->p_vars[i_var];
913 INSERT_ELEM( p_var->p_entries,
918 vlc_mutex_unlock( &p_priv->var_lock );
924 * Remove a callback from a variable
926 * pf_callback and p_data have to be given again, because different objects
927 * might have registered the same callback function.
929 int __var_DelCallback( vlc_object_t *p_this, const char *psz_name,
930 vlc_callback_t pf_callback, void *p_data )
934 vlc_object_internals_t *p_priv = vlc_internals( p_this );
936 vlc_refcheck( p_this );
937 vlc_mutex_lock( &p_priv->var_lock );
939 i_var = GetUnused( p_this, psz_name );
942 vlc_mutex_unlock( &p_priv->var_lock );
946 p_var = &p_priv->p_vars[i_var];
948 for( i_entry = p_var->i_entries ; i_entry-- ; )
950 if( p_var->p_entries[i_entry].pf_callback == pf_callback
951 && p_var->p_entries[i_entry].p_data == p_data )
959 vlc_mutex_unlock( &p_priv->var_lock );
963 REMOVE_ELEM( p_var->p_entries, p_var->i_entries, i_entry );
965 vlc_mutex_unlock( &p_priv->var_lock );
971 * Trigger callback on a variable
973 * \param p_this The object that hold the variable
974 * \param psz_name The name of the variable
976 int __var_TriggerCallback( vlc_object_t *p_this, const char *psz_name )
981 vlc_object_internals_t *p_priv = vlc_internals( p_this );
983 vlc_mutex_lock( &p_priv->var_lock );
985 i_var = GetUnused( p_this, psz_name );
988 vlc_mutex_unlock( &p_priv->var_lock );
992 p_var = &p_priv->p_vars[i_var];
994 /* Backup needed stuff */
997 /* Deal with callbacks. Tell we're in a callback, release the lock,
998 * call stored functions, retake the lock. */
999 if( p_var->i_entries )
1002 int i_entries = p_var->i_entries;
1003 callback_entry_t *p_entries = p_var->p_entries;
1005 p_var->b_incallback = true;
1006 vlc_mutex_unlock( &p_priv->var_lock );
1008 /* The real calls */
1009 for( ; i_entries-- ; )
1011 p_entries[i_entries].pf_callback( p_this, psz_name, oldval, oldval,
1012 p_entries[i_entries].p_data );
1015 vlc_mutex_lock( &p_priv->var_lock );
1017 i_var = Lookup( p_priv->p_vars, p_priv->i_vars, psz_name );
1020 msg_Err( p_this, "variable %s has disappeared", psz_name );
1021 vlc_mutex_unlock( &p_priv->var_lock );
1025 p_var = &p_priv->p_vars[i_var];
1026 p_var->b_incallback = false;
1029 vlc_mutex_unlock( &p_priv->var_lock );
1033 /** Parse a stringified option
1034 * This function parse a string option and create the associated object
1036 * The option must be of the form "[no[-]]foo[=bar]" where foo is the
1037 * option name and bar is the value of the option.
1038 * \param p_obj the object in which the variable must be created
1039 * \param psz_option the option to parse
1040 * \param trusted whether the option is set by a trusted input or not
1043 void var_OptionParse( vlc_object_t *p_obj, const char *psz_option,
1046 char *psz_name, *psz_value;
1048 bool b_isno = false;
1051 val.psz_string = NULL;
1053 /* It's too much of a hassle to remove the ':' when we parse
1054 * the cmd line :) */
1055 if( psz_option[0] == ':' )
1058 if( !psz_option[0] )
1061 psz_name = strdup( psz_option );
1062 if( psz_name == NULL )
1065 psz_value = strchr( psz_name, '=' );
1066 if( psz_value != NULL )
1067 *psz_value++ = '\0';
1069 /* FIXME: :programs should be handled generically */
1070 if( !strcmp( psz_name, "programs" ) )
1071 i_type = VLC_VAR_LIST;
1073 i_type = config_GetType( p_obj, psz_name );
1075 if( !i_type && !psz_value )
1077 /* check for "no-foo" or "nofoo" */
1078 if( !strncmp( psz_name, "no-", 3 ) )
1080 memmove( psz_name, psz_name + 3, strlen(psz_name) + 1 - 3 );
1082 else if( !strncmp( psz_name, "no", 2 ) )
1084 memmove( psz_name, psz_name + 2, strlen(psz_name) + 1 - 2 );
1086 else goto cleanup; /* Option doesn't exist */
1089 i_type = config_GetType( p_obj, psz_name );
1091 if( !i_type ) goto cleanup; /* Option doesn't exist */
1093 if( ( i_type != VLC_VAR_BOOL ) &&
1094 ( !psz_value || !*psz_value ) ) goto cleanup; /* Invalid value */
1096 /* check if option is unsafe */
1099 module_config_t *p_config = config_FindConfig( p_obj, psz_name );
1100 if( !p_config->b_safe )
1102 msg_Err( p_obj, "unsafe option \"%s\" has been ignored for "
1103 "security reasons", psz_name );
1108 /* Create the variable in the input object.
1109 * Children of the input object will be able to retreive this value
1110 * thanks to the inheritance property of the object variables. */
1111 var_Create( p_obj, psz_name, i_type );
1116 val.b_bool = !b_isno;
1119 case VLC_VAR_INTEGER:
1120 val.i_int = strtol( psz_value, NULL, 0 );
1124 val.f_float = atof( psz_value );
1127 case VLC_VAR_STRING:
1128 case VLC_VAR_MODULE:
1130 case VLC_VAR_DIRECTORY:
1131 val.psz_string = psz_value;
1136 char *psz_orig, *psz_var;
1137 vlc_list_t *p_list = malloc(sizeof(vlc_list_t));
1138 val.p_list = p_list;
1139 p_list->i_count = 0;
1141 psz_var = psz_orig = strdup(psz_value);
1142 while( psz_var && *psz_var )
1144 char *psz_item = psz_var;
1146 while( *psz_var && *psz_var != ',' ) psz_var++;
1147 if( *psz_var == ',' )
1152 val2.i_int = strtol( psz_item, NULL, 0 );
1153 INSERT_ELEM( p_list->p_values, p_list->i_count,
1154 p_list->i_count, val2 );
1155 /* p_list->i_count is incremented twice by INSERT_ELEM */
1157 INSERT_ELEM( p_list->pi_types, p_list->i_count,
1158 p_list->i_count, VLC_VAR_INTEGER );
1168 var_Set( p_obj, psz_name, val );
1175 /* Following functions are local */
1177 /*****************************************************************************
1178 * GetUnused: find an unused variable from its name
1179 *****************************************************************************
1180 * We do i_tries tries before giving up, just in case the variable is being
1181 * modified and called from a callback.
1182 *****************************************************************************/
1183 static int GetUnused( vlc_object_t *p_this, const char *psz_name )
1185 int i_var, i_tries = 0;
1186 vlc_object_internals_t *p_priv = vlc_internals( p_this );
1190 i_var = Lookup( p_priv->p_vars, p_priv->i_vars, psz_name );
1196 if( ! p_priv->p_vars[i_var].b_incallback )
1201 if( i_tries++ > 100 )
1203 msg_Err( p_this, "caught in a callback deadlock?" );
1204 return VLC_ETIMEOUT;
1207 vlc_mutex_unlock( &p_priv->var_lock );
1208 msleep( THREAD_SLEEP );
1209 vlc_mutex_lock( &p_priv->var_lock );
1213 /*****************************************************************************
1214 * HashString: our cool hash function
1215 *****************************************************************************
1216 * This function is not intended to be crypto-secure, we only want it to be
1217 * fast and not suck too much. This one is pretty fast and did 0 collisions
1218 * in wenglish's dictionary.
1219 *****************************************************************************/
1220 static uint32_t HashString( const char *psz_string )
1222 uint32_t i_hash = 0;
1224 while( *psz_string )
1226 i_hash += *psz_string++;
1227 i_hash += i_hash << 10;
1228 i_hash ^= i_hash >> 8;
1234 /*****************************************************************************
1235 * Insert: find an empty slot to insert a new variable
1236 *****************************************************************************
1237 * We use a recursive inner function indexed on the hash. This function does
1238 * nothing in the rare cases where a collision may occur, see Lookup()
1239 * to see how we handle them.
1240 * XXX: does this really need to be written recursively?
1241 *****************************************************************************/
1242 static int Insert( variable_t *p_vars, int i_count, const char *psz_name )
1249 return InsertInner( p_vars, i_count, HashString( psz_name ) );
1252 static int InsertInner( variable_t *p_vars, int i_count, uint32_t i_hash )
1256 if( i_hash <= p_vars[0].i_hash )
1261 if( i_hash >= p_vars[i_count - 1].i_hash )
1266 i_middle = i_count / 2;
1268 /* We know that 0 < i_middle */
1269 if( i_hash < p_vars[i_middle].i_hash )
1271 return InsertInner( p_vars, i_middle, i_hash );
1274 /* We know that i_middle + 1 < i_count */
1275 if( i_hash > p_vars[i_middle + 1].i_hash )
1277 return i_middle + 1 + InsertInner( p_vars + i_middle + 1,
1278 i_count - i_middle - 1,
1282 return i_middle + 1;
1285 /*****************************************************************************
1286 * Lookup: find an existing variable given its name
1287 *****************************************************************************
1288 * We use a recursive inner function indexed on the hash. Care is taken of
1289 * possible hash collisions.
1290 * XXX: does this really need to be written recursively?
1291 *****************************************************************************/
1292 static int Lookup( variable_t *p_vars, int i_count, const char *psz_name )
1302 i_hash = HashString( psz_name );
1304 i_pos = LookupInner( p_vars, i_count, i_hash );
1306 /* Hash not found */
1307 if( i_hash != p_vars[i_pos].i_hash )
1312 /* Hash found, entry found */
1313 if( !strcmp( psz_name, p_vars[i_pos].psz_name ) )
1318 /* Hash collision! This should be very rare, but we cannot guarantee
1319 * it will never happen. Just do an exhaustive search amongst all
1320 * entries with the same hash. */
1321 for( i = i_pos - 1 ; i > 0 && i_hash == p_vars[i].i_hash ; i-- )
1323 if( !strcmp( psz_name, p_vars[i].psz_name ) )
1329 for( i = i_pos + 1 ; i < i_count && i_hash == p_vars[i].i_hash ; i++ )
1331 if( !strcmp( psz_name, p_vars[i].psz_name ) )
1337 /* Hash found, but entry not found */
1341 static int LookupInner( variable_t *p_vars, int i_count, uint32_t i_hash )
1345 if( i_hash <= p_vars[0].i_hash )
1350 if( i_hash >= p_vars[i_count-1].i_hash )
1355 i_middle = i_count / 2;
1357 /* We know that 0 < i_middle */
1358 if( i_hash < p_vars[i_middle].i_hash )
1360 return LookupInner( p_vars, i_middle, i_hash );
1363 /* We know that i_middle + 1 < i_count */
1364 if( i_hash > p_vars[i_middle].i_hash )
1366 return i_middle + LookupInner( p_vars + i_middle,
1374 /*****************************************************************************
1375 * CheckValue: check that a value is valid wrt. a variable
1376 *****************************************************************************
1377 * This function checks p_val's value against p_var's limitations such as
1378 * minimal and maximal value, step, in-list position, and modifies p_val if
1380 ****************************************************************************/
1381 static void CheckValue ( variable_t *p_var, vlc_value_t *p_val )
1383 /* Check that our variable is in the list */
1384 if( p_var->i_type & VLC_VAR_HASCHOICE && p_var->choices.i_count )
1388 /* FIXME: the list is sorted, dude. Use something cleverer. */
1389 for( i = p_var->choices.i_count ; i-- ; )
1391 if( p_var->pf_cmp( *p_val, p_var->choices.p_values[i] ) == 0 )
1397 /* If not found, change it to anything vaguely valid */
1400 /* Free the old variable, get the new one, dup it */
1401 p_var->pf_free( p_val );
1402 *p_val = p_var->choices.p_values[p_var->i_default >= 0
1403 ? p_var->i_default : 0 ];
1404 p_var->pf_dup( p_val );
1408 /* Check that our variable is within the bounds */
1409 switch( p_var->i_type & VLC_VAR_TYPE )
1411 case VLC_VAR_INTEGER:
1412 if( p_var->i_type & VLC_VAR_HASSTEP && p_var->step.i_int
1413 && (p_val->i_int % p_var->step.i_int) )
1415 p_val->i_int = (p_val->i_int + (p_var->step.i_int / 2))
1416 / p_var->step.i_int * p_var->step.i_int;
1418 if( p_var->i_type & VLC_VAR_HASMIN
1419 && p_val->i_int < p_var->min.i_int )
1421 p_val->i_int = p_var->min.i_int;
1423 if( p_var->i_type & VLC_VAR_HASMAX
1424 && p_val->i_int > p_var->max.i_int )
1426 p_val->i_int = p_var->max.i_int;
1430 if( p_var->i_type & VLC_VAR_HASSTEP && p_var->step.f_float )
1432 float f_round = p_var->step.f_float * (float)(int)( 0.5 +
1433 p_val->f_float / p_var->step.f_float );
1434 if( p_val->f_float != f_round )
1436 p_val->f_float = f_round;
1439 if( p_var->i_type & VLC_VAR_HASMIN
1440 && p_val->f_float < p_var->min.f_float )
1442 p_val->f_float = p_var->min.f_float;
1444 if( p_var->i_type & VLC_VAR_HASMAX
1445 && p_val->f_float > p_var->max.f_float )
1447 p_val->f_float = p_var->max.f_float;
1456 /*****************************************************************************
1457 * InheritValue: try to inherit the value of this variable from the same one
1458 * in our closest parent.
1459 *****************************************************************************/
1460 static int InheritValue( vlc_object_t *p_this, const char *psz_name,
1461 vlc_value_t *p_val, int i_type )
1466 /* No need to take the structure lock,
1467 * we are only looking for our parents */
1469 if( !p_this->p_parent )
1471 switch( i_type & VLC_VAR_TYPE )
1474 case VLC_VAR_DIRECTORY:
1475 case VLC_VAR_STRING:
1476 case VLC_VAR_MODULE:
1477 p_val->psz_string = config_GetPsz( p_this, psz_name );
1478 if( !p_val->psz_string ) p_val->psz_string = strdup("");
1481 p_val->f_float = config_GetFloat( p_this, psz_name );
1483 case VLC_VAR_INTEGER:
1484 case VLC_VAR_HOTKEY:
1485 p_val->i_int = config_GetInt( p_this, psz_name );
1488 p_val->b_bool = config_GetInt( p_this, psz_name );
1492 char *psz_orig, *psz_var;
1493 vlc_list_t *p_list = malloc(sizeof(vlc_list_t));
1494 p_val->p_list = p_list;
1495 p_list->i_count = 0;
1497 psz_var = psz_orig = config_GetPsz( p_this, psz_name );
1498 while( psz_var && *psz_var )
1500 char *psz_item = psz_var;
1502 while( *psz_var && *psz_var != ',' ) psz_var++;
1503 if( *psz_var == ',' )
1508 val.i_int = strtol( psz_item, NULL, 0 );
1509 INSERT_ELEM( p_list->p_values, p_list->i_count,
1510 p_list->i_count, val );
1511 /* p_list->i_count is incremented twice by INSERT_ELEM */
1513 INSERT_ELEM( p_list->pi_types, p_list->i_count,
1514 p_list->i_count, VLC_VAR_INTEGER );
1527 vlc_object_internals_t *p_priv = vlc_internals( p_this->p_parent );
1529 /* Look for the variable */
1530 vlc_mutex_lock( &p_priv->var_lock );
1532 i_var = Lookup( p_priv->p_vars, p_priv->i_vars, psz_name );
1537 p_var = &p_priv->p_vars[i_var];
1539 /* Really get the variable */
1540 *p_val = p_var->val;
1542 /* Duplicate value if needed */
1543 p_var->pf_dup( p_val );
1545 vlc_mutex_unlock( &p_priv->var_lock );
1549 vlc_mutex_unlock( &p_priv->var_lock );
1551 /* We're still not there */
1553 return InheritValue( p_this->p_parent, psz_name, p_val, i_type );
1556 /**********************************************************************
1557 * Execute a var command on an object identified by its name
1558 **********************************************************************/
1559 int __var_Command( vlc_object_t *p_this, const char *psz_name,
1560 const char *psz_cmd, const char *psz_arg, char **psz_msg )
1562 vlc_object_t *p_obj = vlc_object_find_name( p_this->p_libvlc,
1563 psz_name, FIND_CHILD );
1569 *psz_msg = strdup( "Unknown destination object." );
1573 vlc_refcheck( p_this );
1574 i_type = var_Type( p_obj, psz_cmd );
1575 if( !( i_type&VLC_VAR_ISCOMMAND ) )
1577 vlc_object_release( p_obj );
1579 *psz_msg = strdup( "Variable doesn't exist or isn't a command." );
1580 return VLC_EGENERIC;
1586 case VLC_VAR_INTEGER:
1587 i_ret = var_SetInteger( p_obj, psz_cmd, atoi( psz_arg ) );
1590 i_ret = var_SetFloat( p_obj, psz_cmd, atof( psz_arg ) );
1592 case VLC_VAR_STRING:
1593 i_ret = var_SetString( p_obj, psz_cmd, psz_arg );
1596 i_ret = var_SetBool( p_obj, psz_cmd, atoi( psz_arg ) );
1599 i_ret = VLC_EGENERIC;
1603 vlc_object_release( p_obj );
1607 *psz_msg = (char*)malloc( 80 );
1608 sprintf( *psz_msg, "%s on object %s returned %i (%s)",
1609 psz_cmd, psz_name, i_ret, vlc_error( i_ret ) );