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 "variables.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 )
72 p_val->psz_string = strdup( p_val->psz_string ? p_val->psz_string : "" );
75 static void DupList( vlc_value_t *p_val )
78 vlc_list_t *p_list = malloc( sizeof(vlc_list_t) );
80 p_list->i_count = p_val->p_list->i_count;
81 if( p_val->p_list->i_count )
83 p_list->p_values = malloc( p_list->i_count * sizeof(vlc_value_t) );
84 p_list->pi_types = malloc( p_list->i_count * sizeof(int) );
88 p_list->p_values = NULL;
89 p_list->pi_types = NULL;
92 for( i = 0; i < p_list->i_count; i++ )
94 p_list->p_values[i] = p_val->p_list->p_values[i];
95 p_list->pi_types[i] = p_val->p_list->pi_types[i];
96 switch( p_val->p_list->pi_types[i] & VLC_VAR_CLASS )
100 DupString( &p_list->p_values[i] );
107 p_val->p_list = p_list;
110 static void FreeDummy( vlc_value_t *p_val ) { (void)p_val; /* unused */ }
111 static void FreeString( vlc_value_t *p_val ) { free( p_val->psz_string ); }
112 static void FreeMutex( vlc_value_t *p_val ) { vlc_mutex_destroy( (vlc_mutex_t*)p_val->p_address ); free( p_val->p_address ); }
114 static void FreeList( vlc_value_t *p_val )
117 for( i = 0; i < p_val->p_list->i_count; i++ )
119 switch( p_val->p_list->pi_types[i] & VLC_VAR_CLASS )
122 FreeString( &p_val->p_list->p_values[i] );
125 FreeMutex( &p_val->p_list->p_values[i] );
132 if( p_val->p_list->i_count )
134 free( p_val->p_list->p_values );
135 free( p_val->p_list->pi_types );
137 free( p_val->p_list );
140 static const struct variable_ops_t
141 void_ops = { NULL, DupDummy, FreeDummy, },
142 addr_ops = { CmpAddress, DupDummy, FreeDummy, },
143 bool_ops = { CmpBool, DupDummy, FreeDummy, },
144 float_ops = { CmpFloat, DupDummy, FreeDummy, },
145 int_ops = { CmpInt, DupDummy, FreeDummy, },
146 list_ops = { CmpAddress, DupList, FreeList, },
147 mutex_ops = { CmpAddress, DupDummy, FreeMutex, },
148 string_ops = { CmpString, DupString, FreeString, },
149 time_ops = { CmpTime, DupDummy, FreeDummy, };
151 /*****************************************************************************
153 *****************************************************************************/
154 static int GetUnused ( vlc_object_t *, const char * );
155 static uint32_t HashString ( const char * );
156 static int Insert ( variable_t *, int, const char * );
157 static int InsertInner ( variable_t *, int, uint32_t );
158 static int Lookup ( variable_t *, size_t, const char * );
160 static void CheckValue ( variable_t *, vlc_value_t * );
162 static int InheritValue( vlc_object_t *, const char *, vlc_value_t *,
164 static int TriggerCallback( vlc_object_t *, variable_t **, const char *,
168 * Initialize a vlc variable
170 * We hash the given string and insert it into the sorted list. The insertion
171 * may require slow memory copies, but think about what we gain in the log(n)
172 * lookup phase when setting/getting the variable value!
174 * \param p_this The object in which to create the variable
175 * \param psz_name The name of the variable
176 * \param i_type The variables type. Must be one of \ref var_type combined with
177 * zero or more \ref var_flags
179 int __var_Create( vlc_object_t *p_this, const char *psz_name, int i_type )
183 static vlc_list_t dummy_null_list = {0, NULL, NULL};
184 vlc_object_internals_t *p_priv = vlc_internals( p_this );
186 vlc_mutex_lock( &p_priv->var_lock );
188 /* FIXME: if the variable already exists, we don't duplicate it. But we
189 * duplicate the lookups. It's not that serious, but if anyone finds some
190 * time to rework Insert() so that only one lookup has to be done, feel
192 i_new = Lookup( p_priv->p_vars, p_priv->i_vars, psz_name );
196 /* If the types differ, variable creation failed. */
197 if( (i_type & VLC_VAR_CLASS) != (p_priv->p_vars[i_new].i_type & VLC_VAR_CLASS) )
199 msg_Err( p_this, "Variable '%s' (0x%04x) already exist but with a different type (0x%04x)",
200 psz_name, p_priv->p_vars[i_new].i_type, i_type );
201 vlc_mutex_unlock( &p_priv->var_lock );
205 p_priv->p_vars[i_new].i_usage++;
206 p_priv->p_vars[i_new].i_type |= ( i_type & VLC_VAR_ISCOMMAND );
207 p_priv->p_vars[i_new].i_type |= ( i_type & VLC_VAR_HASCHOICE );
208 vlc_mutex_unlock( &p_priv->var_lock );
212 i_new = Insert( p_priv->p_vars, p_priv->i_vars, psz_name );
214 if( (p_priv->i_vars & 15) == 15 )
216 p_priv->p_vars = realloc( p_priv->p_vars,
217 (p_priv->i_vars+17) * sizeof(variable_t) );
220 memmove( p_priv->p_vars + i_new + 1,
221 p_priv->p_vars + i_new,
222 (p_priv->i_vars - i_new) * sizeof(variable_t) );
226 p_var = &p_priv->p_vars[i_new];
227 memset( p_var, 0, sizeof(*p_var) );
229 p_var->i_hash = HashString( psz_name );
230 p_var->psz_name = strdup( psz_name );
231 p_var->psz_text = NULL;
233 p_var->i_type = i_type & ~VLC_VAR_DOINHERIT;
237 p_var->i_default = -1;
238 p_var->choices.i_count = 0;
239 p_var->choices.p_values = NULL;
240 p_var->choices_text.i_count = 0;
241 p_var->choices_text.p_values = NULL;
243 p_var->b_incallback = false;
244 p_var->i_entries = 0;
245 p_var->p_entries = NULL;
247 /* Always initialize the variable, even if it is a list variable; this
248 * will lead to errors if the variable is not initialized, but it will
249 * not cause crashes in the variable handling. */
250 switch( i_type & VLC_VAR_CLASS )
253 p_var->ops = &bool_ops;
254 p_var->val.b_bool = false;
256 case VLC_VAR_INTEGER:
257 p_var->ops = &int_ops;
258 p_var->val.i_int = 0;
261 p_var->ops = &string_ops;
262 p_var->val.psz_string = NULL;
265 p_var->ops = &float_ops;
266 p_var->val.f_float = 0.0;
269 p_var->ops = &time_ops;
270 p_var->val.i_time = 0;
272 case VLC_VAR_ADDRESS:
273 p_var->ops = &addr_ops;
274 p_var->val.p_address = NULL;
277 p_var->ops = &mutex_ops;
278 p_var->val.p_address = malloc( sizeof(vlc_mutex_t) );
279 vlc_mutex_init( (vlc_mutex_t*)p_var->val.p_address );
282 p_var->ops = &list_ops;
283 p_var->val.p_list = &dummy_null_list;
286 p_var->ops = &void_ops;
290 /* Duplicate the default data we stored. */
291 p_var->ops->pf_dup( &p_var->val );
293 if( i_type & VLC_VAR_DOINHERIT )
297 if( InheritValue( p_this, psz_name, &val, p_var->i_type )
300 /* Free data if needed */
301 p_var->ops->pf_free( &p_var->val );
302 /* Set the variable */
305 if( i_type & VLC_VAR_HASCHOICE )
307 /* We must add the inherited value to our choice list */
308 p_var->i_default = 0;
310 INSERT_ELEM( p_var->choices.p_values, p_var->choices.i_count,
312 INSERT_ELEM( p_var->choices_text.p_values,
313 p_var->choices_text.i_count, 0, val );
314 p_var->ops->pf_dup( &p_var->choices.p_values[0] );
315 p_var->choices_text.p_values[0].psz_string = NULL;
320 vlc_mutex_unlock( &p_priv->var_lock );
326 * Destroy a vlc variable
328 * Look for the variable and destroy it if it is found. As in var_Create we
329 * do a call to memmove() but we have performance counterparts elsewhere.
331 * \param p_this The object that holds the variable
332 * \param psz_name The name of the variable
334 int __var_Destroy( vlc_object_t *p_this, const char *psz_name )
338 vlc_object_internals_t *p_priv = vlc_internals( p_this );
340 vlc_mutex_lock( &p_priv->var_lock );
342 i_var = GetUnused( p_this, psz_name );
345 vlc_mutex_unlock( &p_priv->var_lock );
349 p_var = &p_priv->p_vars[i_var];
351 if( p_var->i_usage > 1 )
354 vlc_mutex_unlock( &p_priv->var_lock );
358 /* Free value if needed */
359 p_var->ops->pf_free( &p_var->val );
361 /* Free choice list if needed */
362 if( p_var->choices.i_count )
364 for( i = 0 ; i < p_var->choices.i_count ; i++ )
366 p_var->ops->pf_free( &p_var->choices.p_values[i] );
367 free( p_var->choices_text.p_values[i].psz_string );
369 free( p_var->choices.p_values );
370 free( p_var->choices_text.p_values );
373 /* Free callbacks if needed */
374 free( p_var->p_entries );
376 free( p_var->psz_name );
377 free( p_var->psz_text );
379 memmove( p_priv->p_vars + i_var,
380 p_priv->p_vars + i_var + 1,
381 (p_priv->i_vars - i_var - 1) * sizeof(variable_t) );
383 if( (p_priv->i_vars & 15) == 0 )
385 p_priv->p_vars = realloc( p_priv->p_vars,
386 (p_priv->i_vars) * sizeof( variable_t ) );
391 vlc_mutex_unlock( &p_priv->var_lock );
397 * Perform an action on a variable
399 * \param p_this The object that holds the variable
400 * \param psz_name The name of the variable
401 * \param i_action The action to perform. Must be one of \ref var_action
402 * \param p_val First action parameter
403 * \param p_val2 Second action parameter
405 int __var_Change( vlc_object_t *p_this, const char *psz_name,
406 int i_action, vlc_value_t *p_val, vlc_value_t *p_val2 )
411 vlc_object_internals_t *p_priv = vlc_internals( 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->ops->pf_free( &p_var->min );
432 p_var->i_type |= VLC_VAR_HASMIN;
434 p_var->ops->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->ops->pf_free( &p_var->max );
448 p_var->i_type |= VLC_VAR_HASMAX;
450 p_var->ops->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->ops->pf_free( &p_var->step );
464 p_var->i_type |= VLC_VAR_HASSTEP;
465 p_var->step = *p_val;
466 p_var->ops->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->ops->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->ops->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->ops->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->ops->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->ops->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->ops->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->ops->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->ops->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_SETTEXT:
608 free( p_var->psz_text );
609 if( p_val && p_val->psz_string )
610 p_var->psz_text = strdup( p_val->psz_string );
612 p_var->psz_text = NULL;
614 case VLC_VAR_GETTEXT:
615 p_val->psz_string = NULL;
616 if( p_var->psz_text )
618 p_val->psz_string = strdup( p_var->psz_text );
621 case VLC_VAR_INHERITVALUE:
625 if( InheritValue( p_this,
626 p_val2 ? p_val2->psz_string : psz_name,
627 &val, p_var->i_type )
630 /* Duplicate already done */
632 /* Backup needed stuff */
634 /* Check boundaries and list */
635 CheckValue( p_var, &val );
636 /* Set the variable */
638 /* Free data if needed */
639 p_var->ops->pf_free( &oldval );
645 p_var->ops->pf_dup( p_val );
650 case VLC_VAR_SETISCOMMAND:
651 p_var->i_type |= VLC_VAR_ISCOMMAND;
658 vlc_mutex_unlock( &p_priv->var_lock );
665 * Perform a Get and Set on a variable
667 * \param p_this: The object that hold the variable
668 * \param psz_name: the name of the variable
669 * \param i_action: the action to perform
670 * \param p_val: The action parameter
671 * \return vlc error codes
673 int __var_GetAndSet( vlc_object_t *p_this, const char *psz_name, int i_action,
677 int i_ret = VLC_SUCCESS;
680 vlc_object_internals_t *p_priv = vlc_internals( p_this );
682 vlc_mutex_lock( &p_priv->var_lock );
683 i_var = GetUnused( p_this, psz_name );
686 vlc_mutex_unlock( &p_priv->var_lock );
690 p_var = &p_priv->p_vars[i_var];
692 /* Duplicated data if needed */
693 //p_var->ops->pf_dup( &val );
695 /* Backup needed stuff */
698 /* depending of the action requiered */
701 case VLC_VAR_TOGGLE_BOOL:
702 assert( ( p_var->i_type & VLC_VAR_BOOL ) == VLC_VAR_BOOL );
703 p_var->val.b_bool = !p_var->val.b_bool;
705 case VLC_VAR_INTEGER_INCDEC:
706 assert( ( p_var->i_type & VLC_VAR_INTEGER ) == VLC_VAR_INTEGER );
707 p_var->val.i_int += val.i_int;
710 vlc_mutex_unlock( &p_priv->var_lock );
714 /* Check boundaries */
715 CheckValue( p_var, &p_var->val );
717 /* Deal with callbacks.*/
718 if( p_var->i_entries )
719 i_ret = TriggerCallback( p_this, &p_var, psz_name, oldval );
721 vlc_mutex_unlock( &p_priv->var_lock );
728 * Request a variable's type
730 * \return The variable type if it exists, or 0 if the
731 * variable could not be found.
734 int __var_Type( vlc_object_t *p_this, const char *psz_name )
737 vlc_object_internals_t *p_priv = vlc_internals( p_this );
739 vlc_mutex_lock( &p_priv->var_lock );
741 i_var = Lookup( p_priv->p_vars, p_priv->i_vars, psz_name );
745 vlc_mutex_unlock( &p_priv->var_lock );
749 i_type = p_priv->p_vars[i_var].i_type;
751 vlc_mutex_unlock( &p_priv->var_lock );
756 int var_SetChecked( vlc_object_t *p_this, const char *psz_name,
757 int expected_type, vlc_value_t val )
760 int i_ret = VLC_SUCCESS;
763 vlc_object_internals_t *p_priv = vlc_internals( p_this );
765 vlc_mutex_lock( &p_priv->var_lock );
767 i_var = GetUnused( p_this, psz_name );
770 vlc_mutex_unlock( &p_priv->var_lock );
774 p_var = &p_priv->p_vars[i_var];
775 assert( expected_type == 0 ||
776 (p_var->i_type & VLC_VAR_CLASS) == expected_type );
778 /* Duplicate data if needed */
779 p_var->ops->pf_dup( &val );
781 /* Backup needed stuff */
784 /* Check boundaries and list */
785 CheckValue( p_var, &val );
787 /* Set the variable */
790 /* Deal with callbacks */
791 if( p_var->i_entries )
792 i_ret = TriggerCallback( p_this, &p_var, psz_name, oldval );
794 /* Free data if needed */
795 p_var->ops->pf_free( &oldval );
797 vlc_mutex_unlock( &p_priv->var_lock );
804 * Set a variable's value
806 * \param p_this The object that hold the variable
807 * \param psz_name The name of the variable
808 * \param val the value to set
810 int __var_Set( vlc_object_t *p_this, const char *psz_name, vlc_value_t val )
812 return var_SetChecked( p_this, psz_name, 0, val );
815 int var_GetChecked( vlc_object_t *p_this, const char *psz_name,
816 int expected_type, vlc_value_t *p_val )
818 vlc_object_internals_t *p_priv = vlc_internals( p_this );
819 int i_var, err = VLC_SUCCESS;
821 vlc_mutex_lock( &p_priv->var_lock );
823 i_var = Lookup( p_priv->p_vars, p_priv->i_vars, psz_name );
826 variable_t *p_var = &p_priv->p_vars[i_var];
828 assert( expected_type == 0 ||
829 (p_var->i_type & VLC_VAR_CLASS) == expected_type );
831 /* Really get the variable */
835 /* Alert if the type is VLC_VAR_VOID */
836 if( ( p_var->i_type & VLC_VAR_TYPE ) == VLC_VAR_VOID )
837 msg_Warn( p_this, "Calling var_GetVoid on the void variable '%s' (0x%04x)", psz_name, p_var->i_type );
840 /* Duplicate value if needed */
841 p_var->ops->pf_dup( p_val );
846 vlc_mutex_unlock( &p_priv->var_lock );
851 * Get a variable's value
853 * \param p_this The object that holds the variable
854 * \param psz_name The name of the variable
855 * \param p_val Pointer to a vlc_value_t that will hold the variable's value
856 * after the function is finished
858 int __var_Get( vlc_object_t *p_this, const char *psz_name, vlc_value_t *p_val )
860 return var_GetChecked( p_this, psz_name, 0, p_val );
864 * Register a callback in a variable
866 * We store a function pointer that will be called upon variable
869 * \param p_this The object that holds the variable
870 * \param psz_name The name of the variable
871 * \param pf_callback The function pointer
872 * \param p_data A generic pointer that will be passed as the last
873 * argument to the callback function.
875 * \warning The callback function is run in the thread that calls var_Set on
876 * the variable. Use proper locking. This thread may not have much
877 * time to spare, so keep callback functions short.
879 int __var_AddCallback( vlc_object_t *p_this, const char *psz_name,
880 vlc_callback_t pf_callback, void *p_data )
884 callback_entry_t entry;
885 vlc_object_internals_t *p_priv = vlc_internals( p_this );
887 entry.pf_callback = pf_callback;
888 entry.p_data = p_data;
890 vlc_mutex_lock( &p_priv->var_lock );
892 i_var = GetUnused( p_this, psz_name );
895 vlc_mutex_unlock( &p_priv->var_lock );
899 p_var = &p_priv->p_vars[i_var];
901 INSERT_ELEM( p_var->p_entries,
906 vlc_mutex_unlock( &p_priv->var_lock );
912 * Remove a callback from a variable
914 * pf_callback and p_data have to be given again, because different objects
915 * might have registered the same callback function.
917 int __var_DelCallback( vlc_object_t *p_this, const char *psz_name,
918 vlc_callback_t pf_callback, void *p_data )
922 vlc_object_internals_t *p_priv = vlc_internals( p_this );
924 vlc_mutex_lock( &p_priv->var_lock );
926 i_var = GetUnused( p_this, psz_name );
929 vlc_mutex_unlock( &p_priv->var_lock );
933 p_var = &p_priv->p_vars[i_var];
935 for( i_entry = p_var->i_entries ; i_entry-- ; )
937 if( p_var->p_entries[i_entry].pf_callback == pf_callback
938 && p_var->p_entries[i_entry].p_data == p_data )
943 else if( p_var->p_entries[i_entry].pf_callback == pf_callback )
945 msg_Warn( p_this, "Calling var_DelCallback for '%s' with the same "
946 "function but not the same data.", psz_name );
953 vlc_mutex_unlock( &p_priv->var_lock );
957 REMOVE_ELEM( p_var->p_entries, p_var->i_entries, i_entry );
959 vlc_mutex_unlock( &p_priv->var_lock );
965 * Trigger callback on a variable
967 * \param p_this The object that hold the variable
968 * \param psz_name The name of the variable
970 int __var_TriggerCallback( vlc_object_t *p_this, const char *psz_name )
973 int i_ret = VLC_SUCCESS;
975 vlc_object_internals_t *p_priv = vlc_internals( p_this );
977 vlc_mutex_lock( &p_priv->var_lock );
979 i_var = GetUnused( p_this, psz_name );
982 vlc_mutex_unlock( &p_priv->var_lock );
986 p_var = &p_priv->p_vars[i_var];
988 /* Deal with callbacks. Tell we're in a callback, release the lock,
989 * call stored functions, retake the lock. */
990 if( p_var->i_entries )
991 i_ret = TriggerCallback( p_this, &p_var, psz_name, p_var->val );
993 vlc_mutex_unlock( &p_priv->var_lock );
997 /** Parse a stringified option
998 * This function parse a string option and create the associated object
1000 * The option must be of the form "[no[-]]foo[=bar]" where foo is the
1001 * option name and bar is the value of the option.
1002 * \param p_obj the object in which the variable must be created
1003 * \param psz_option the option to parse
1004 * \param trusted whether the option is set by a trusted input or not
1007 void var_OptionParse( vlc_object_t *p_obj, const char *psz_option,
1010 char *psz_name, *psz_value;
1012 bool b_isno = false;
1015 val.psz_string = NULL;
1017 /* It's too much of a hassle to remove the ':' when we parse
1018 * the cmd line :) */
1019 if( psz_option[0] == ':' )
1022 if( !psz_option[0] )
1025 psz_name = strdup( psz_option );
1026 if( psz_name == NULL )
1029 psz_value = strchr( psz_name, '=' );
1030 if( psz_value != NULL )
1031 *psz_value++ = '\0';
1033 /* FIXME: :programs should be handled generically */
1034 if( !strcmp( psz_name, "programs" ) )
1035 i_type = VLC_VAR_LIST;
1037 i_type = config_GetType( p_obj, psz_name );
1039 if( !i_type && !psz_value )
1041 /* check for "no-foo" or "nofoo" */
1042 if( !strncmp( psz_name, "no-", 3 ) )
1044 memmove( psz_name, psz_name + 3, strlen(psz_name) + 1 - 3 );
1046 else if( !strncmp( psz_name, "no", 2 ) )
1048 memmove( psz_name, psz_name + 2, strlen(psz_name) + 1 - 2 );
1050 else goto cleanup; /* Option doesn't exist */
1053 i_type = config_GetType( p_obj, psz_name );
1055 if( !i_type ) goto cleanup; /* Option doesn't exist */
1057 if( ( i_type != VLC_VAR_BOOL ) &&
1058 ( !psz_value || !*psz_value ) ) goto cleanup; /* Invalid value */
1060 /* check if option is unsafe */
1063 module_config_t *p_config = config_FindConfig( p_obj, psz_name );
1064 if( !p_config || !p_config->b_safe )
1066 msg_Err( p_obj, "unsafe option \"%s\" has been ignored for "
1067 "security reasons", psz_name );
1073 /* Create the variable in the input object.
1074 * Children of the input object will be able to retreive this value
1075 * thanks to the inheritance property of the object variables. */
1076 __var_Create( p_obj, psz_name, i_type );
1081 val.b_bool = !b_isno;
1084 case VLC_VAR_INTEGER:
1085 val.i_int = strtol( psz_value, NULL, 0 );
1089 val.f_float = atof( psz_value );
1092 case VLC_VAR_STRING:
1093 case VLC_VAR_MODULE:
1095 case VLC_VAR_DIRECTORY:
1096 val.psz_string = psz_value;
1101 char *psz_orig, *psz_var;
1102 vlc_list_t *p_list = malloc(sizeof(vlc_list_t));
1103 val.p_list = p_list;
1104 p_list->i_count = 0;
1106 psz_var = psz_orig = strdup(psz_value);
1107 while( psz_var && *psz_var )
1109 char *psz_item = psz_var;
1111 while( *psz_var && *psz_var != ',' ) psz_var++;
1112 if( *psz_var == ',' )
1117 val2.i_int = strtol( psz_item, NULL, 0 );
1118 INSERT_ELEM( p_list->p_values, p_list->i_count,
1119 p_list->i_count, val2 );
1120 /* p_list->i_count is incremented twice by INSERT_ELEM */
1122 INSERT_ELEM( p_list->pi_types, p_list->i_count,
1123 p_list->i_count, VLC_VAR_INTEGER );
1133 __var_Set( p_obj, psz_name, val );
1135 /* If that's a list, remove all elements allocated */
1136 if( i_type == VLC_VAR_LIST )
1144 /* Following functions are local */
1146 /*****************************************************************************
1147 * GetUnused: find an unused (not in callback) variable from its name
1148 *****************************************************************************
1149 * We do i_tries tries before giving up, just in case the variable is being
1150 * modified and called from a callback.
1151 *****************************************************************************/
1152 static int GetUnused( vlc_object_t *p_this, const char *psz_name )
1154 vlc_object_internals_t *p_priv = vlc_internals( p_this );
1160 i_var = Lookup( p_priv->p_vars, p_priv->i_vars, psz_name );
1166 if( ! p_priv->p_vars[i_var].b_incallback )
1171 mutex_cleanup_push( &p_priv->var_lock );
1172 vlc_cond_wait( &p_priv->var_wait, &p_priv->var_lock );
1177 /*****************************************************************************
1178 * HashString: our cool hash function
1179 *****************************************************************************
1180 * This function is not intended to be crypto-secure, we only want it to be
1181 * fast and not suck too much. This one is pretty fast and did 0 collisions
1182 * in wenglish's dictionary.
1183 *****************************************************************************/
1184 static uint32_t HashString( const char *psz_string )
1186 uint32_t i_hash = 0;
1188 while( *psz_string )
1190 i_hash += *psz_string++;
1191 i_hash += i_hash << 10;
1192 i_hash ^= i_hash >> 8;
1198 /*****************************************************************************
1199 * Insert: find an empty slot to insert a new variable
1200 *****************************************************************************
1201 * We use a recursive inner function indexed on the hash. This function does
1202 * nothing in the rare cases where a collision may occur, see Lookup()
1203 * to see how we handle them.
1204 * XXX: does this really need to be written recursively?
1205 *****************************************************************************/
1206 static int Insert( variable_t *p_vars, int i_count, const char *psz_name )
1213 return InsertInner( p_vars, i_count, HashString( psz_name ) );
1216 static int InsertInner( variable_t *p_vars, int i_count, uint32_t i_hash )
1220 if( i_hash <= p_vars[0].i_hash )
1225 if( i_hash >= p_vars[i_count - 1].i_hash )
1230 i_middle = i_count / 2;
1232 /* We know that 0 < i_middle */
1233 if( i_hash < p_vars[i_middle].i_hash )
1235 return InsertInner( p_vars, i_middle, i_hash );
1238 /* We know that i_middle + 1 < i_count */
1239 if( i_hash > p_vars[i_middle + 1].i_hash )
1241 return i_middle + 1 + InsertInner( p_vars + i_middle + 1,
1242 i_count - i_middle - 1,
1246 return i_middle + 1;
1249 static int u32cmp( const void *key, const void *data )
1251 const variable_t *p_var = data;
1252 uint32_t hash = *(const uint32_t *)key ;
1254 if( hash > p_var->i_hash )
1256 if( hash < p_var->i_hash )
1261 /*****************************************************************************
1262 * Lookup: find an existing variable given its name
1263 *****************************************************************************
1264 * We use a recursive inner function indexed on the hash. Care is taken of
1265 * possible hash collisions.
1266 *****************************************************************************/
1267 static int Lookup( variable_t *p_vars, size_t i_count, const char *psz_name )
1272 i_hash = HashString( psz_name );
1273 p_var = bsearch( &i_hash, p_vars, i_count, sizeof( *p_var ), u32cmp );
1275 /* Hash not found */
1279 assert( i_count > 0 );
1281 /* Find the first entry with the right hash */
1282 while( (p_var > p_vars) && (i_hash == p_var[-1].i_hash) )
1285 assert( p_var->i_hash == i_hash );
1287 /* Hash collision should be very unlikely, but we cannot guarantee
1288 * it will never happen. So we do an exhaustive search amongst all
1289 * entries with the same hash. Typically, there is only one anyway. */
1290 for( variable_t *p_end = p_vars + i_count;
1291 (p_var < p_end) && (i_hash == p_var->i_hash);
1294 if( !strcmp( psz_name, p_var->psz_name ) )
1295 return p_var - p_vars;
1298 /* Hash found, but entry not found */
1302 /*****************************************************************************
1303 * CheckValue: check that a value is valid wrt. a variable
1304 *****************************************************************************
1305 * This function checks p_val's value against p_var's limitations such as
1306 * minimal and maximal value, step, in-list position, and modifies p_val if
1308 ****************************************************************************/
1309 static void CheckValue ( variable_t *p_var, vlc_value_t *p_val )
1311 /* Check that our variable is in the list */
1312 if( p_var->i_type & VLC_VAR_HASCHOICE && p_var->choices.i_count )
1316 /* This list is not sorted so go throug it (this is a small list) */
1317 for( i = p_var->choices.i_count ; i-- ; )
1319 if( p_var->ops->pf_cmp( *p_val, p_var->choices.p_values[i] ) == 0 )
1325 /* If not found, change it to anything vaguely valid */
1328 /* Free the old variable, get the new one, dup it */
1329 p_var->ops->pf_free( p_val );
1330 *p_val = p_var->choices.p_values[p_var->i_default >= 0
1331 ? p_var->i_default : 0 ];
1332 p_var->ops->pf_dup( p_val );
1336 /* Check that our variable is within the bounds */
1337 switch( p_var->i_type & VLC_VAR_TYPE )
1339 case VLC_VAR_INTEGER:
1340 if( p_var->i_type & VLC_VAR_HASSTEP && p_var->step.i_int
1341 && (p_val->i_int % p_var->step.i_int) )
1343 p_val->i_int = (p_val->i_int + (p_var->step.i_int / 2))
1344 / p_var->step.i_int * p_var->step.i_int;
1346 if( p_var->i_type & VLC_VAR_HASMIN
1347 && p_val->i_int < p_var->min.i_int )
1349 p_val->i_int = p_var->min.i_int;
1351 if( p_var->i_type & VLC_VAR_HASMAX
1352 && p_val->i_int > p_var->max.i_int )
1354 p_val->i_int = p_var->max.i_int;
1358 if( p_var->i_type & VLC_VAR_HASSTEP && p_var->step.f_float )
1360 float f_round = p_var->step.f_float * (float)(int)( 0.5 +
1361 p_val->f_float / p_var->step.f_float );
1362 if( p_val->f_float != f_round )
1364 p_val->f_float = f_round;
1367 if( p_var->i_type & VLC_VAR_HASMIN
1368 && p_val->f_float < p_var->min.f_float )
1370 p_val->f_float = p_var->min.f_float;
1372 if( p_var->i_type & VLC_VAR_HASMAX
1373 && p_val->f_float > p_var->max.f_float )
1375 p_val->f_float = p_var->max.f_float;
1384 /*****************************************************************************
1385 * InheritValue: try to inherit the value of this variable from the same one
1386 * in our closest parent, libvlc or ultimately from the configuration.
1387 * The function should always be entered with the object var_lock locked.
1388 *****************************************************************************/
1389 static int InheritValue( vlc_object_t *p_this, const char *psz_name,
1390 vlc_value_t *p_val, int i_type )
1395 if( p_this->p_parent || ( p_this->p_libvlc && p_this != (vlc_object_t*) p_this->p_libvlc ) )
1397 vlc_object_internals_t *p_priv;
1399 if( p_this->p_parent )
1400 p_priv = vlc_internals( p_this->p_parent );
1402 p_priv = vlc_internals( p_this->p_libvlc );
1404 i_var = Lookup( p_priv->p_vars, p_priv->i_vars, psz_name );
1409 p_var = &p_priv->p_vars[i_var];
1411 /* Really get the variable */
1412 *p_val = p_var->val;
1414 /* Duplicate value if needed */
1415 p_var->ops->pf_dup( p_val );
1417 /*msg_Dbg( p_this, "Inherited value for var %s from object %s",
1418 psz_name ? psz_name : "(null)",
1419 p_this->psz_object_name
1420 ? p_this->psz_object_name : "(Unknown)" );*/
1423 else if ( p_this->p_parent ) /* We are still not there */
1424 return InheritValue( p_this->p_parent, psz_name, p_val, i_type );
1426 /* else take value from config */
1430 switch( i_type & VLC_VAR_CLASS )
1432 case VLC_VAR_STRING:
1433 p_val->psz_string = config_GetPsz( p_this, psz_name );
1434 if( !p_val->psz_string ) p_val->psz_string = strdup("");
1437 p_val->f_float = config_GetFloat( p_this, psz_name );
1439 case VLC_VAR_INTEGER:
1440 p_val->i_int = config_GetInt( p_this, psz_name );
1443 p_val->b_bool = config_GetInt( p_this, psz_name );
1447 char *psz_orig, *psz_var;
1448 vlc_list_t *p_list = malloc(sizeof(vlc_list_t));
1449 p_val->p_list = p_list;
1450 p_list->i_count = 0;
1452 psz_var = psz_orig = config_GetPsz( p_this, psz_name );
1453 while( psz_var && *psz_var )
1455 char *psz_item = psz_var;
1457 while( *psz_var && *psz_var != ',' ) psz_var++;
1458 if( *psz_var == ',' )
1463 val.i_int = strtol( psz_item, NULL, 0 );
1464 INSERT_ELEM( p_list->p_values, p_list->i_count,
1465 p_list->i_count, val );
1466 /* p_list->i_count is incremented twice by INSERT_ELEM */
1468 INSERT_ELEM( p_list->pi_types, p_list->i_count,
1469 p_list->i_count, VLC_VAR_INTEGER );
1475 msg_Warn( p_this, "Could not inherit value for var %s "
1476 "from config. Invalid Type", psz_name );
1480 /*msg_Dbg( p_this, "Inherited value for var %s from config", psz_name );*/
1485 /**********************************************************************
1486 * Trigger the callbacks.
1487 * Tell we're in a callback, release the lock, call stored functions,
1489 **********************************************************************/
1490 static int TriggerCallback( vlc_object_t *p_this, variable_t **pp_var,
1491 const char *psz_name, vlc_value_t oldval )
1494 int i_entries = (*pp_var)->i_entries;
1495 callback_entry_t *p_entries = (*pp_var)->p_entries;
1496 vlc_object_internals_t *p_priv = vlc_internals( p_this );
1498 (*pp_var)->b_incallback = true;
1499 vlc_mutex_unlock( &p_priv->var_lock );
1501 /* The real calls */
1502 for( ; i_entries-- ; )
1504 p_entries[i_entries].pf_callback( p_this, psz_name, oldval, (*pp_var)->val,
1505 p_entries[i_entries].p_data );
1508 vlc_mutex_lock( &p_priv->var_lock );
1510 i_var = Lookup( p_priv->p_vars, p_priv->i_vars, psz_name );
1513 msg_Err( p_this, "variable %s has disappeared", psz_name );
1517 *pp_var = &p_priv->p_vars[i_var];
1518 (*pp_var)->b_incallback = false;
1519 vlc_cond_broadcast( &p_priv->var_wait );
1525 /**********************************************************************
1526 * Execute a var command on an object identified by its name
1527 **********************************************************************/
1528 int __var_Command( vlc_object_t *p_this, const char *psz_name,
1529 const char *psz_cmd, const char *psz_arg, char **psz_msg )
1531 vlc_object_t *p_obj = vlc_object_find_name( p_this->p_libvlc,
1532 psz_name, FIND_CHILD );
1538 *psz_msg = strdup( "Unknown destination object." );
1542 i_type = var_Type( p_obj, psz_cmd );
1543 if( !( i_type&VLC_VAR_ISCOMMAND ) )
1545 vlc_object_release( p_obj );
1547 *psz_msg = strdup( "Variable doesn't exist or isn't a command." );
1548 return VLC_EGENERIC;
1551 i_type &= VLC_VAR_CLASS;
1554 case VLC_VAR_INTEGER:
1555 i_ret = var_SetInteger( p_obj, psz_cmd, atoi( psz_arg ) );
1558 i_ret = var_SetFloat( p_obj, psz_cmd, atof( psz_arg ) );
1560 case VLC_VAR_STRING:
1561 i_ret = var_SetString( p_obj, psz_cmd, psz_arg );
1564 i_ret = var_SetBool( p_obj, psz_cmd, atoi( psz_arg ) );
1567 i_ret = VLC_EGENERIC;
1571 vlc_object_release( p_obj );
1575 if( asprintf( psz_msg, "%s on object %s returned %i (%s)",
1576 psz_cmd, psz_name, i_ret, vlc_error( i_ret ) ) == -1)
1585 * Free a list and the associated strings
1586 * @param p_val: the list variable
1587 * @param p_val2: the variable associated or NULL
1589 void var_FreeList( vlc_value_t *p_val, vlc_value_t *p_val2 )
1592 if( p_val2 && p_val2->p_list )
1594 for( int i = 0; i < p_val2->p_list->i_count; i++ )
1595 free( p_val2->p_list->p_values[i].psz_string );
1596 if( p_val2->p_list->i_count )
1598 free( p_val2->p_list->p_values );
1599 free( p_val2->p_list->pi_types );
1601 free( p_val2->p_list );