* all : declaration of http and httpd.
[vlc.git] / src / misc / objects.c
1 /*****************************************************************************
2  * objects.c: vlc_object_t handling
3  *****************************************************************************
4  * Copyright (C) 2002 VideoLAN
5  * $Id: objects.c,v 1.35 2003/02/23 19:07:02 fenrir Exp $
6  *
7  * Authors: Samuel Hocevar <sam@zoy.org>
8  *
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.
13  *
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.
18  *
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., 59 Temple Place - Suite 330, Boston, MA  02111, USA.
22  *****************************************************************************/
23
24 /*****************************************************************************
25  * Preamble
26  *****************************************************************************/
27 #include <vlc/vlc.h>
28
29 #ifdef HAVE_STDLIB_H
30 #   include <stdlib.h>                                          /* realloc() */
31 #endif
32
33 #include "stream_control.h"
34 #include "input_ext-intf.h"
35 #include "input_ext-dec.h"
36
37 #include "video.h"
38 #include "video_output.h"
39
40 #include "audio_output.h"
41 #include "aout_internal.h"
42 #include "stream_output.h"
43
44 #include "vlc_playlist.h"
45 #include "interface.h"
46
47 #include "httpd.h"
48 /*****************************************************************************
49  * Local prototypes
50  *****************************************************************************/
51 static int  DumpCommand( vlc_object_t *, char const *,
52                          vlc_value_t, vlc_value_t, void * );
53
54 static vlc_object_t * FindObject    ( vlc_object_t *, int, int );
55 static void           DetachObject  ( vlc_object_t * );
56 static void           PrintObject   ( vlc_object_t *, const char * );
57 static void           DumpStructure ( vlc_object_t *, int, char * );
58 static int            FindIndex     ( vlc_object_t *, vlc_object_t **, int );
59 static void           SetAttachment ( vlc_object_t *, vlc_bool_t );
60
61 static vlc_list_t   * NewList       ( int );
62 static void           ListReplace   ( vlc_list_t *, vlc_object_t *, int );
63 static void           ListAppend    ( vlc_list_t *, vlc_object_t * );
64 static int            CountChildren ( vlc_object_t *, int );
65 static void           ListChildren  ( vlc_list_t *, vlc_object_t *, int );
66
67 /*****************************************************************************
68  * Local structure lock
69  *****************************************************************************/
70 static vlc_mutex_t    structure_lock;
71
72 /*****************************************************************************
73  * vlc_object_create: initialize a vlc object
74  *****************************************************************************
75  * This function allocates memory for a vlc object and initializes it. If
76  * i_type is not a known value such as VLC_OBJECT_ROOT, VLC_OBJECT_VOUT and
77  * so on, vlc_object_create will use its value for the object size.
78  *****************************************************************************/
79 void * __vlc_object_create( vlc_object_t *p_this, int i_type )
80 {
81     vlc_object_t * p_new;
82     char *         psz_type;
83     size_t         i_size;
84
85     switch( i_type )
86     {
87         case VLC_OBJECT_ROOT:
88             i_size = sizeof(libvlc_t);
89             psz_type = "root";
90             break;
91         case VLC_OBJECT_VLC:
92             i_size = sizeof(vlc_t);
93             psz_type = "vlc";
94             break;
95         case VLC_OBJECT_MODULE:
96             i_size = sizeof(module_t);
97             psz_type = "module";
98             break;
99         case VLC_OBJECT_INTF:
100             i_size = sizeof(intf_thread_t);
101             psz_type = "interface";
102             break;
103         case VLC_OBJECT_PLAYLIST:
104             i_size = sizeof(playlist_t);
105             psz_type = "playlist";
106             break;
107         case VLC_OBJECT_INPUT:
108             i_size = sizeof(input_thread_t);
109             psz_type = "input";
110             break;
111         case VLC_OBJECT_DECODER:
112             i_size = sizeof(decoder_fifo_t);
113             psz_type = "decoder";
114             break;
115         case VLC_OBJECT_VOUT:
116             i_size = sizeof(vout_thread_t);
117             psz_type = "video output";
118             break;
119         case VLC_OBJECT_AOUT:
120             i_size = sizeof(aout_instance_t);
121             psz_type = "audio output";
122             break;
123         case VLC_OBJECT_SOUT:
124             i_size = sizeof(sout_instance_t);
125             psz_type = "stream output";
126             break;
127         case VLC_OBJECT_HTTPD:
128             i_size = sizeof( httpd_t );
129             psz_type = "http daemon";
130             break;
131         default:
132             i_size = i_type > 0
133                       ? i_type > (int)sizeof(vlc_object_t)
134                          ? i_type : (int)sizeof(vlc_object_t)
135                       : (int)sizeof(vlc_object_t);
136             i_type = VLC_OBJECT_GENERIC;
137             psz_type = "generic";
138             break;
139     }
140
141     if( i_type == VLC_OBJECT_ROOT )
142     {
143         p_new = p_this;
144     }
145     else
146     {
147         p_new = malloc( i_size );
148
149         if( !p_new )
150         {
151             return NULL;
152         }
153
154         memset( p_new, 0, i_size );
155     }
156
157     p_new->i_object_type = i_type;
158     p_new->psz_object_type = psz_type;
159
160     p_new->psz_object_name = NULL;
161
162     p_new->b_die = VLC_FALSE;
163     p_new->b_error = VLC_FALSE;
164     p_new->b_dead = VLC_FALSE;
165     p_new->b_attached = VLC_FALSE;
166
167     p_new->i_vars = 0;
168     p_new->p_vars = (variable_t *)malloc( 16 * sizeof( variable_t ) );
169
170     if( !p_new->p_vars )
171     {
172         free( p_new );
173         return NULL;
174     }
175
176     if( i_type == VLC_OBJECT_ROOT )
177     {
178         /* If i_type is root, then p_new is actually p_libvlc */
179         p_new->p_libvlc = (libvlc_t*)p_new;
180         p_new->p_vlc = NULL;
181
182         p_new->p_libvlc->i_counter = 0;
183         p_new->i_object_id = 0;
184
185         p_new->p_libvlc->i_objects = 1;
186         p_new->p_libvlc->pp_objects = malloc( sizeof(vlc_object_t *) );
187         p_new->p_libvlc->pp_objects[0] = p_new;
188         p_new->b_attached = VLC_TRUE;
189     }
190     else
191     {
192         p_new->p_libvlc = p_this->p_libvlc;
193         p_new->p_vlc = ( i_type == VLC_OBJECT_VLC ) ? (vlc_t*)p_new
194                                                     : p_this->p_vlc;
195
196         vlc_mutex_lock( &structure_lock );
197
198         p_new->p_libvlc->i_counter++;
199         p_new->i_object_id = p_new->p_libvlc->i_counter;
200
201         /* Wooohaa! If *this* fails, we're in serious trouble! Anyway it's
202          * useless to try and recover anything if pp_objects gets smashed. */
203         INSERT_ELEM( p_new->p_libvlc->pp_objects,
204                      p_new->p_libvlc->i_objects,
205                      p_new->p_libvlc->i_objects,
206                      p_new );
207
208         vlc_mutex_unlock( &structure_lock );
209     }
210
211     p_new->i_refcount = 0;
212     p_new->p_parent = NULL;
213     p_new->pp_children = NULL;
214     p_new->i_children = 0;
215
216     p_new->p_private = NULL;
217
218     /* Initialize mutexes and condvars */
219     vlc_mutex_init( p_new, &p_new->object_lock );
220     vlc_cond_init( p_new, &p_new->object_wait );
221     vlc_mutex_init( p_new, &p_new->var_lock );
222
223     if( i_type == VLC_OBJECT_ROOT )
224     {
225         vlc_mutex_init( p_new, &structure_lock );
226
227         var_Create( p_new, "list", VLC_VAR_STRING | VLC_VAR_ISCOMMAND );
228         var_AddCallback( p_new, "list", DumpCommand, NULL );
229         var_Create( p_new, "tree", VLC_VAR_STRING | VLC_VAR_ISCOMMAND );
230         var_AddCallback( p_new, "tree", DumpCommand, NULL );
231     }
232
233     return p_new;
234 }
235
236 /*****************************************************************************
237  * vlc_object_destroy: destroy a vlc object
238  *****************************************************************************
239  * This function destroys an object that has been previously allocated with
240  * vlc_object_create. The object's refcount must be zero and it must not be
241  * attached to other objects in any way.
242  *****************************************************************************/
243 void __vlc_object_destroy( vlc_object_t *p_this )
244 {
245     int i_delay = 0;
246
247     if( p_this->i_children )
248     {
249         msg_Err( p_this, "cannot delete object with children" );
250         return;
251     }
252
253     if( p_this->p_parent )
254     {
255         msg_Err( p_this, "cannot delete object with a parent" );
256         return;
257     }
258
259     while( p_this->i_refcount )
260     {
261         i_delay++;
262
263         /* Don't warn immediately ... 100ms seems OK */
264         if( i_delay == 2 )
265         {
266             msg_Warn( p_this, "refcount is %i, delaying before deletion",
267                               p_this->i_refcount );
268         }
269         else if( i_delay == 12 )
270         {
271             msg_Err( p_this, "refcount is %i, I have a bad feeling about this",
272                              p_this->i_refcount );
273         }
274         else if( i_delay == 42 )
275         {
276             msg_Err( p_this, "we waited too long, cancelling destruction" );
277             return;
278         }
279
280         msleep( 100000 );
281     }
282
283     /* Destroy the associated variables, starting from the end so that
284      * no memmove calls have to be done. */
285     while( p_this->i_vars )
286     {
287         var_Destroy( p_this, p_this->p_vars[p_this->i_vars - 1].psz_name );
288     }
289
290     free( p_this->p_vars );
291     vlc_mutex_destroy( &p_this->var_lock );
292
293     if( p_this->i_object_type == VLC_OBJECT_ROOT )
294     {
295         /* We are the root object ... no need to lock. */
296         free( p_this->p_libvlc->pp_objects );
297         p_this->p_libvlc->pp_objects = NULL;
298         p_this->p_libvlc->i_objects--;
299
300         vlc_mutex_destroy( &structure_lock );
301     }
302     else
303     {
304         int i_index;
305
306         vlc_mutex_lock( &structure_lock );
307
308         /* Wooohaa! If *this* fails, we're in serious trouble! Anyway it's
309          * useless to try and recover anything if pp_objects gets smashed. */
310         i_index = FindIndex( p_this, p_this->p_libvlc->pp_objects,
311                              p_this->p_libvlc->i_objects );
312         REMOVE_ELEM( p_this->p_libvlc->pp_objects,
313                      p_this->p_libvlc->i_objects, i_index );
314
315         vlc_mutex_unlock( &structure_lock );
316     }
317
318     vlc_mutex_destroy( &p_this->object_lock );
319     vlc_cond_destroy( &p_this->object_wait );
320
321     free( p_this );
322 }
323
324 /*****************************************************************************
325  * vlc_object_get: find an object given its ID
326  *****************************************************************************
327  * This function looks for the object whose i_object_id field is i_id. We
328  * use a dichotomy so that lookups are in log2(n).
329  *****************************************************************************/
330 void * __vlc_object_get( vlc_object_t *p_this, int i_id )
331 {
332     int i_max, i_middle;
333     vlc_object_t **pp_objects;
334
335     vlc_mutex_lock( &structure_lock );
336
337     pp_objects = p_this->p_libvlc->pp_objects;
338
339     /* Perform our dichotomy */
340     for( i_max = p_this->p_libvlc->i_objects - 1 ; ; )
341     {
342         i_middle = i_max / 2;
343
344         if( pp_objects[i_middle]->i_object_id > i_id )
345         {
346             i_max = i_middle;
347         }
348         else if( pp_objects[i_middle]->i_object_id < i_id )
349         {
350             if( i_middle )
351             {
352                 pp_objects += i_middle;
353                 i_max -= i_middle;
354             }
355             else
356             {
357                 /* This happens when there are only two remaining objects */
358                 if( pp_objects[i_middle+1]->i_object_id == i_id )
359                 {
360                     vlc_mutex_unlock( &structure_lock );
361                     pp_objects[i_middle+1]->i_refcount++;
362                     return pp_objects[i_middle+1];
363                 }
364                 break;
365             }
366         }
367         else
368         {
369             vlc_mutex_unlock( &structure_lock );
370             pp_objects[i_middle]->i_refcount++;
371             return pp_objects[i_middle];
372         }
373
374         if( i_max == 0 )
375         {
376             /* this means that i_max == i_middle, and since we have already
377              * tested pp_objects[i_middle]), p_found is properly set. */
378             break;
379         }
380     }
381
382     vlc_mutex_unlock( &structure_lock );
383     return NULL;
384 }
385
386 /*****************************************************************************
387  * vlc_object_find: find a typed object and increment its refcount
388  *****************************************************************************
389  * This function recursively looks for a given object type. i_mode can be one
390  * of FIND_PARENT, FIND_CHILD or FIND_ANYWHERE.
391  *****************************************************************************/
392 void * __vlc_object_find( vlc_object_t *p_this, int i_type, int i_mode )
393 {
394     vlc_object_t *p_found;
395
396     vlc_mutex_lock( &structure_lock );
397
398     /* If we are of the requested type ourselves, don't look further */
399     if( !(i_mode & FIND_STRICT) && p_this->i_object_type == i_type )
400     {
401         p_this->i_refcount++;
402         vlc_mutex_unlock( &structure_lock );
403         return p_this;
404     }
405
406     /* Otherwise, recursively look for the object */
407     if( (i_mode & 0x000f) == FIND_ANYWHERE )
408     {
409         p_found = FindObject( VLC_OBJECT(p_this->p_vlc), i_type,
410                               (i_mode & ~0x000f) | FIND_CHILD );
411     }
412     else
413     {
414         p_found = FindObject( p_this, i_type, i_mode );
415     }
416
417     vlc_mutex_unlock( &structure_lock );
418
419     return p_found;
420 }
421
422 /*****************************************************************************
423  * vlc_object_yield: increment an object refcount
424  *****************************************************************************/
425 void __vlc_object_yield( vlc_object_t *p_this )
426 {
427     vlc_mutex_lock( &structure_lock );
428     p_this->i_refcount++;
429     vlc_mutex_unlock( &structure_lock );
430 }
431
432 /*****************************************************************************
433  * vlc_object_release: decrement an object refcount
434  *****************************************************************************/
435 void __vlc_object_release( vlc_object_t *p_this )
436 {
437     vlc_mutex_lock( &structure_lock );
438     p_this->i_refcount--;
439     vlc_mutex_unlock( &structure_lock );
440 }
441
442 /*****************************************************************************
443  * vlc_object_attach: attach object to a parent object
444  *****************************************************************************
445  * This function sets p_this as a child of p_parent, and p_parent as a parent
446  * of p_this. This link can be undone using vlc_object_detach.
447  *****************************************************************************/
448 void __vlc_object_attach( vlc_object_t *p_this, vlc_object_t *p_parent )
449 {
450     vlc_mutex_lock( &structure_lock );
451
452     /* Attach the parent to its child */
453     p_this->p_parent = p_parent;
454
455     /* Attach the child to its parent */
456     INSERT_ELEM( p_parent->pp_children, p_parent->i_children,
457                  p_parent->i_children, p_this );
458
459     /* Climb up the tree to see whether we are connected with the root */
460     if( p_parent->b_attached )
461     {
462         SetAttachment( p_this, VLC_TRUE );
463     }
464
465     vlc_mutex_unlock( &structure_lock );
466 }
467
468 /*****************************************************************************
469  * vlc_object_detach: detach object from its parent
470  *****************************************************************************
471  * This function removes all links between an object and its parent.
472  *****************************************************************************/
473 void __vlc_object_detach( vlc_object_t *p_this )
474 {
475     vlc_mutex_lock( &structure_lock );
476     if( !p_this->p_parent )
477     {
478         msg_Err( p_this, "object is not attached" );
479         vlc_mutex_unlock( &structure_lock );
480         return;
481     }
482
483     /* Climb up the tree to see whether we are connected with the root */
484     if( p_this->p_parent->b_attached )
485     {
486         SetAttachment( p_this, VLC_FALSE );
487     }
488
489     DetachObject( p_this );
490     vlc_mutex_unlock( &structure_lock );
491 }
492
493 /*****************************************************************************
494  * vlc_list_find: find a list typed objects and increment their refcount
495  *****************************************************************************
496  * This function recursively looks for a given object type. i_mode can be one
497  * of FIND_PARENT, FIND_CHILD or FIND_ANYWHERE.
498  *****************************************************************************/
499 vlc_list_t * __vlc_list_find( vlc_object_t *p_this, int i_type, int i_mode )
500 {
501     vlc_list_t *p_list;
502     vlc_object_t **pp_current, **pp_end;
503     int i_count = 0, i_index = 0;
504
505     vlc_mutex_lock( &structure_lock );
506
507     /* Look for the objects */
508     switch( i_mode & 0x000f )
509     {
510     case FIND_ANYWHERE:
511         pp_current = p_this->p_libvlc->pp_objects;
512         pp_end = pp_current + p_this->p_libvlc->i_objects;
513
514         for( ; pp_current < pp_end ; pp_current++ )
515         {
516             if( (*pp_current)->b_attached
517                  && (*pp_current)->i_object_type == i_type )
518             {
519                 i_count++;
520             }
521         }
522
523         p_list = NewList( i_count );
524         pp_current = p_this->p_libvlc->pp_objects;
525
526         for( ; pp_current < pp_end ; pp_current++ )
527         {
528             if( (*pp_current)->b_attached
529                  && (*pp_current)->i_object_type == i_type )
530             {
531                 ListReplace( p_list, *pp_current, i_index );
532                 if( i_index < i_count ) i_index++;
533             }
534         }
535     break;
536
537     case FIND_CHILD:
538         i_count = CountChildren( p_this, i_type );
539         p_list = NewList( i_count );
540
541         /* Check allocation was successful */
542         if( p_list->i_count != i_count )
543         {
544             msg_Err( p_this, "list allocation failed!" );
545             p_list->i_count = 0;
546             break;
547         }
548
549         p_list->i_count = 0;
550         ListChildren( p_list, p_this, i_type );
551         break;
552
553     default:
554         msg_Err( p_this, "unimplemented!" );
555         p_list = NewList( 0 );
556         break;
557     }
558
559     vlc_mutex_unlock( &structure_lock );
560
561     return p_list;
562 }
563
564 /*****************************************************************************
565  * DumpCommand: print the current vlc structure
566  *****************************************************************************
567  * This function prints either an ASCII tree showing the connections between
568  * vlc objects, and additional information such as their refcount, thread ID,
569  * etc. (command "tree"), or the same data as a simple list (command "list").
570  *****************************************************************************/
571 static int DumpCommand( vlc_object_t *p_this, char const *psz_cmd,
572                         vlc_value_t oldval, vlc_value_t newval, void *p_data )
573 {
574     if( *psz_cmd == 't' )
575     {
576         char psz_foo[2 * MAX_DUMPSTRUCTURE_DEPTH + 1];
577         vlc_object_t *p_object;
578
579         if( *newval.psz_string )
580         {
581             p_object = vlc_object_get( p_this, atoi(newval.psz_string) );
582
583             if( !p_object )
584             {
585                 return VLC_ENOOBJ;
586             }
587         }
588         else
589         {
590             p_object = p_this->p_vlc ? VLC_OBJECT(p_this->p_vlc) : p_this;
591         }
592
593         vlc_mutex_lock( &structure_lock );
594
595         psz_foo[0] = '|';
596         DumpStructure( p_object, 0, psz_foo );
597
598         vlc_mutex_unlock( &structure_lock );
599
600         if( *newval.psz_string )
601         {
602             vlc_object_release( p_this );
603         }
604     }
605     else if( *psz_cmd == 'l' )
606     {
607         vlc_object_t **pp_current, **pp_end;
608
609         vlc_mutex_lock( &structure_lock );
610
611         pp_current = p_this->p_libvlc->pp_objects;
612         pp_end = pp_current + p_this->p_libvlc->i_objects;
613
614         for( ; pp_current < pp_end ; pp_current++ )
615         {
616             if( (*pp_current)->b_attached )
617             {
618                 PrintObject( *pp_current, "" );
619             }
620             else
621             {
622                 printf( " o %.8i %s (not attached)\n",
623                         (*pp_current)->i_object_id,
624                         (*pp_current)->psz_object_type );
625             }
626         }
627
628         vlc_mutex_unlock( &structure_lock );
629     }
630
631     return VLC_SUCCESS;
632 }
633
634 /*****************************************************************************
635  * vlc_list_release: free a list previously allocated by vlc_list_find
636  *****************************************************************************
637  * This function decreases the refcount of all objects in the list and
638  * frees the list.
639  *****************************************************************************/
640 void vlc_list_release( vlc_list_t *p_list )
641 {
642     int i_index;
643
644     for( i_index = 0; i_index < p_list->i_count; i_index++ )
645     {
646         vlc_mutex_lock( &structure_lock );
647
648         p_list->p_values[i_index].p_object->i_refcount--;
649
650         vlc_mutex_unlock( &structure_lock );
651     }
652
653     free( p_list->p_values );
654     free( p_list );
655 }
656
657 /* Following functions are local */
658
659 /*****************************************************************************
660  * FindIndex: find the index of an object in an array of objects
661  *****************************************************************************
662  * This function assumes that p_this can be found in pp_objects. It will not
663  * crash if p_this cannot be found, but will return a wrong value. It is your
664  * duty to check the return value if you are not certain that the object could
665  * be found for sure.
666  *****************************************************************************/
667 static int FindIndex( vlc_object_t *p_this,
668                       vlc_object_t **pp_objects, int i_count )
669 {
670     int i_middle = i_count / 2;
671
672     if( i_count == 0 )
673     {
674         return 0;
675     }
676
677     if( pp_objects[i_middle] == p_this )
678     {
679         return i_middle;
680     }
681
682     if( i_count == 1 )
683     {
684         return 0;
685     }
686
687     /* We take advantage of the sorted array */
688     if( pp_objects[i_middle]->i_object_id < p_this->i_object_id )
689     {
690         return i_middle + FindIndex( p_this, pp_objects + i_middle,
691                                              i_count - i_middle );
692     }
693     else
694     {
695         return FindIndex( p_this, pp_objects, i_middle );
696     }
697 }
698
699 static vlc_object_t * FindObject( vlc_object_t *p_this, int i_type, int i_mode )
700 {
701     int i;
702     vlc_object_t *p_tmp;
703
704     switch( i_mode & 0x000f )
705     {
706     case FIND_PARENT:
707         p_tmp = p_this->p_parent;
708         if( p_tmp )
709         {
710             if( p_tmp->i_object_type == i_type )
711             {
712                 p_tmp->i_refcount++;
713                 return p_tmp;
714             }
715             else
716             {
717                 return FindObject( p_tmp, i_type, i_mode );
718             }
719         }
720         break;
721
722     case FIND_CHILD:
723         for( i = p_this->i_children; i--; )
724         {
725             p_tmp = p_this->pp_children[i];
726             if( p_tmp->i_object_type == i_type )
727             {
728                 p_tmp->i_refcount++;
729                 return p_tmp;
730             }
731             else if( p_tmp->i_children )
732             {
733                 p_tmp = FindObject( p_tmp, i_type, i_mode );
734                 if( p_tmp )
735                 {
736                     return p_tmp;
737                 }
738             }
739         }
740         break;
741
742     case FIND_ANYWHERE:
743         /* Handled in vlc_object_find */
744         break;
745     }
746
747     return NULL;
748 }
749
750 static void DetachObject( vlc_object_t *p_this )
751 {
752     vlc_object_t *p_parent = p_this->p_parent;
753     int i_index, i;
754
755     /* Remove p_this's parent */
756     p_this->p_parent = NULL;
757
758     /* Remove all of p_parent's children which are p_this */
759     for( i_index = p_parent->i_children ; i_index-- ; )
760     {
761         if( p_parent->pp_children[i_index] == p_this )
762         {
763             p_parent->i_children--;
764             for( i = i_index ; i < p_parent->i_children ; i++ )
765             {
766                 p_parent->pp_children[i] = p_parent->pp_children[i+1];
767             }
768         }
769     }
770
771     if( p_parent->i_children )
772     {
773         p_parent->pp_children = (vlc_object_t **)realloc( p_parent->pp_children,
774                                p_parent->i_children * sizeof(vlc_object_t *) );
775     }
776     else
777     {
778         free( p_parent->pp_children );
779         p_parent->pp_children = NULL;
780     }
781 }
782
783 /*****************************************************************************
784  * SetAttachment: recursively set the b_attached flag of a subtree.
785  *****************************************************************************
786  * This function is used by the attach and detach functions to propagate
787  * the b_attached flag in a subtree.
788  *****************************************************************************/
789 static void SetAttachment( vlc_object_t *p_this, vlc_bool_t b_attached )
790 {
791     int i_index;
792
793     for( i_index = p_this->i_children ; i_index-- ; )
794     {
795         SetAttachment( p_this->pp_children[i_index], b_attached );
796     }
797
798     p_this->b_attached = b_attached;
799 }
800
801 static void PrintObject( vlc_object_t *p_this, const char *psz_prefix )
802 {
803     char psz_children[20], psz_refcount[20], psz_thread[20], psz_name[50];
804
805     psz_name[0] = '\0';
806     if( p_this->psz_object_name )
807     {
808         snprintf( psz_name, 50, " \"%s\"", p_this->psz_object_name );
809         psz_name[48] = '\"';
810         psz_name[49] = '\0';
811     }
812
813     psz_children[0] = '\0';
814     switch( p_this->i_children )
815     {
816         case 0:
817             break;
818         case 1:
819             strcpy( psz_children, ", 1 child" );
820             break;
821         default:
822             snprintf( psz_children, 20,
823                       ", %i children", p_this->i_children );
824             psz_children[19] = '\0';
825             break;
826     }
827
828     psz_refcount[0] = '\0';
829     if( p_this->i_refcount )
830     {
831         snprintf( psz_refcount, 20, ", refcount %i", p_this->i_refcount );
832         psz_refcount[19] = '\0';
833     }
834
835     psz_thread[0] = '\0';
836     if( p_this->b_thread )
837     {
838         snprintf( psz_thread, 20, " (thread %d)", (int)p_this->thread_id );
839         psz_thread[19] = '\0';
840     }
841
842     printf( " %so %.8i %s%s%s%s%s\n", psz_prefix,
843             p_this->i_object_id, p_this->psz_object_type,
844             psz_name, psz_thread, psz_refcount, psz_children );
845 }
846
847 static void DumpStructure( vlc_object_t *p_this, int i_level, char *psz_foo )
848 {
849     int i;
850     char i_back = psz_foo[i_level];
851     psz_foo[i_level] = '\0';
852
853     PrintObject( p_this, psz_foo );
854
855     psz_foo[i_level] = i_back;
856
857     if( i_level / 2 >= MAX_DUMPSTRUCTURE_DEPTH )
858     {
859         msg_Warn( p_this, "structure tree is too deep" );
860         return;
861     }
862
863     for( i = 0 ; i < p_this->i_children ; i++ )
864     {
865         if( i_level )
866         {
867             psz_foo[i_level-1] = ' ';
868
869             if( psz_foo[i_level-2] == '`' )
870             {
871                 psz_foo[i_level-2] = ' ';
872             }
873         }
874
875         if( i == p_this->i_children - 1 )
876         {
877             psz_foo[i_level] = '`';
878         }
879         else
880         {
881             psz_foo[i_level] = '|';
882         }
883
884         psz_foo[i_level+1] = '-';
885         psz_foo[i_level+2] = '\0';
886
887         DumpStructure( p_this->pp_children[i], i_level + 2, psz_foo );
888     }
889 }
890
891 static vlc_list_t * NewList( int i_count )
892 {
893     vlc_list_t * p_list = (vlc_list_t *)malloc( sizeof( vlc_list_t ) );
894     if( p_list == NULL )
895     {
896         return NULL;
897     }
898
899     p_list->i_count = i_count;
900
901     if( i_count == 0 )
902     {
903         p_list->p_values = NULL;
904         return p_list;
905     }
906
907     p_list->p_values = malloc( i_count * sizeof( vlc_value_t ) );
908     if( p_list->p_values == NULL )
909     {
910         p_list->i_count = 0;
911         return p_list;
912     }
913
914     return p_list;
915 }
916
917 static void ListReplace( vlc_list_t *p_list, vlc_object_t *p_object,
918                          int i_index )
919 {
920     if( p_list == NULL || i_index >= p_list->i_count )
921     {
922         return;
923     }
924
925     p_object->i_refcount++;
926
927     p_list->p_values[i_index].p_object = p_object;
928
929     return;
930 }
931
932 static void ListAppend( vlc_list_t *p_list, vlc_object_t *p_object )
933 {
934     if( p_list == NULL )
935     {
936         return;
937     }
938
939     p_list->p_values = realloc( p_list->p_values, (p_list->i_count + 1)
940                                 * sizeof( vlc_value_t ) );
941     if( p_list->p_values == NULL )
942     {
943         p_list->i_count = 0;
944         return;
945     }
946
947     p_object->i_refcount++;
948
949     p_list->p_values[p_list->i_count].p_object = p_object;
950     p_list->i_count++;
951
952     return;
953 }
954
955 static int CountChildren( vlc_object_t *p_this, int i_type )
956 {
957     vlc_object_t *p_tmp;
958     int i, i_count = 0;
959
960     for( i = 0; i < p_this->i_children; i++ )
961     {
962         p_tmp = p_this->pp_children[i];
963
964         if( p_tmp->i_object_type == i_type )
965         {
966             i_count++;
967         }
968
969         if( p_tmp->i_children )
970         {
971             i_count += CountChildren( p_tmp, i_type );
972         }
973     }
974
975     return i_count;
976 }
977
978 static void ListChildren( vlc_list_t *p_list, vlc_object_t *p_this, int i_type )
979 {
980     vlc_object_t *p_tmp;
981     int i;
982
983     for( i = 0; i < p_this->i_children; i++ )
984     {
985         p_tmp = p_this->pp_children[i];
986
987         if( p_tmp->i_object_type == i_type )
988         {
989             ListReplace( p_list, p_tmp, p_list->i_count++ );
990         }
991
992         if( p_tmp->i_children )
993         {
994             ListChildren( p_list, p_tmp, i_type );
995         }
996     }
997 }