git.sesse.net Git - vlc/blob - src/misc/objects.c

   1 /*****************************************************************************
   2  * objects.c: vlc_object_t handling
   3  *****************************************************************************
   4  * Copyright (C) 2002 VideoLAN
   5  * $Id: objects.c,v 1.38 2003/09/02 20:19:26 gbazin 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 "vlc_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 "vlc_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_t);
 113             psz_type = "decoder";
 114             break;
 115         case VLC_OBJECT_DECODER_FIFO: /* tmp for backward compat */
 116             i_size = sizeof(decoder_fifo_t);
 117             psz_type = "decoder";
 118             break;
 119         case VLC_OBJECT_VOUT:
 120             i_size = sizeof(vout_thread_t);
 121             psz_type = "video output";
 122             break;
 123         case VLC_OBJECT_AOUT:
 124             i_size = sizeof(aout_instance_t);
 125             psz_type = "audio output";
 126             break;
 127         case VLC_OBJECT_SOUT:
 128             i_size = sizeof(sout_instance_t);
 129             psz_type = "stream output";
 130             break;
 131         case VLC_OBJECT_HTTPD:
 132             i_size = sizeof( httpd_t );
 133             psz_type = "http daemon";
 134             break;
 135         default:
 136             i_size = i_type > 0
 137                       ? i_type > (int)sizeof(vlc_object_t)
 138                          ? i_type : (int)sizeof(vlc_object_t)
 139                       : (int)sizeof(vlc_object_t);
 140             i_type = VLC_OBJECT_GENERIC;
 141             psz_type = "generic";
 142             break;
 143     }
 144
 145     if( i_type == VLC_OBJECT_ROOT )
 146     {
 147         p_new = p_this;
 148     }
 149     else
 150     {
 151         p_new = malloc( i_size );
 152
 153         if( !p_new )
 154         {
 155             return NULL;
 156         }
 157
 158         memset( p_new, 0, i_size );
 159     }
 160
 161     p_new->i_object_type = i_type;
 162     p_new->psz_object_type = psz_type;
 163
 164     p_new->psz_object_name = NULL;
 165
 166     p_new->b_die = VLC_FALSE;
 167     p_new->b_error = VLC_FALSE;
 168     p_new->b_dead = VLC_FALSE;
 169     p_new->b_attached = VLC_FALSE;
 170
 171     p_new->i_vars = 0;
 172     p_new->p_vars = (variable_t *)malloc( 16 * sizeof( variable_t ) );
 173
 174     if( !p_new->p_vars )
 175     {
 176         free( p_new );
 177         return NULL;
 178     }
 179
 180     if( i_type == VLC_OBJECT_ROOT )
 181     {
 182         /* If i_type is root, then p_new is actually p_libvlc */
 183         p_new->p_libvlc = (libvlc_t*)p_new;
 184         p_new->p_vlc = NULL;
 185
 186         p_new->p_libvlc->i_counter = 0;
 187         p_new->i_object_id = 0;
 188
 189         p_new->p_libvlc->i_objects = 1;
 190         p_new->p_libvlc->pp_objects = malloc( sizeof(vlc_object_t *) );
 191         p_new->p_libvlc->pp_objects[0] = p_new;
 192         p_new->b_attached = VLC_TRUE;
 193     }
 194     else
 195     {
 196         p_new->p_libvlc = p_this->p_libvlc;
 197         p_new->p_vlc = ( i_type == VLC_OBJECT_VLC ) ? (vlc_t*)p_new
 198                                                     : p_this->p_vlc;
 199
 200         vlc_mutex_lock( &structure_lock );
 201
 202         p_new->p_libvlc->i_counter++;
 203         p_new->i_object_id = p_new->p_libvlc->i_counter;
 204
 205         /* Wooohaa! If *this* fails, we're in serious trouble! Anyway it's
 206          * useless to try and recover anything if pp_objects gets smashed. */
 207         INSERT_ELEM( p_new->p_libvlc->pp_objects,
 208                      p_new->p_libvlc->i_objects,
 209                      p_new->p_libvlc->i_objects,
 210                      p_new );
 211
 212         vlc_mutex_unlock( &structure_lock );
 213     }
 214
 215     p_new->i_refcount = 0;
 216     p_new->p_parent = NULL;
 217     p_new->pp_children = NULL;
 218     p_new->i_children = 0;
 219
 220     p_new->p_private = NULL;
 221
 222     /* Initialize mutexes and condvars */
 223     vlc_mutex_init( p_new, &p_new->object_lock );
 224     vlc_cond_init( p_new, &p_new->object_wait );
 225     vlc_mutex_init( p_new, &p_new->var_lock );
 226
 227     if( i_type == VLC_OBJECT_ROOT )
 228     {
 229         vlc_mutex_init( p_new, &structure_lock );
 230
 231         var_Create( p_new, "list", VLC_VAR_STRING | VLC_VAR_ISCOMMAND );
 232         var_AddCallback( p_new, "list", DumpCommand, NULL );
 233         var_Create( p_new, "tree", VLC_VAR_STRING | VLC_VAR_ISCOMMAND );
 234         var_AddCallback( p_new, "tree", DumpCommand, NULL );
 235     }
 236
 237     return p_new;
 238 }
 239
 240 /*****************************************************************************
 241  * vlc_object_destroy: destroy a vlc object
 242  *****************************************************************************
 243  * This function destroys an object that has been previously allocated with
 244  * vlc_object_create. The object's refcount must be zero and it must not be
 245  * attached to other objects in any way.
 246  *****************************************************************************/
 247 void __vlc_object_destroy( vlc_object_t *p_this )
 248 {
 249     int i_delay = 0;
 250
 251     if( p_this->i_children )
 252     {
 253         msg_Err( p_this, "cannot delete object with children" );
 254         return;
 255     }
 256
 257     if( p_this->p_parent )
 258     {
 259         msg_Err( p_this, "cannot delete object with a parent" );
 260         return;
 261     }
 262
 263     while( p_this->i_refcount )
 264     {
 265         i_delay++;
 266
 267         /* Don't warn immediately ... 100ms seems OK */
 268         if( i_delay == 2 )
 269         {
 270             msg_Warn( p_this, "refcount is %i, delaying before deletion",
 271                               p_this->i_refcount );
 272         }
 273         else if( i_delay == 12 )
 274         {
 275             msg_Err( p_this, "refcount is %i, I have a bad feeling about this",
 276                              p_this->i_refcount );
 277         }
 278         else if( i_delay == 42 )
 279         {
 280             msg_Err( p_this, "we waited too long, cancelling destruction" );
 281             return;
 282         }
 283
 284         msleep( 100000 );
 285     }
 286
 287     /* Destroy the associated variables, starting from the end so that
 288      * no memmove calls have to be done. */
 289     while( p_this->i_vars )
 290     {
 291         var_Destroy( p_this, p_this->p_vars[p_this->i_vars - 1].psz_name );
 292     }
 293
 294     free( p_this->p_vars );
 295     vlc_mutex_destroy( &p_this->var_lock );
 296
 297     if( p_this->i_object_type == VLC_OBJECT_ROOT )
 298     {
 299         /* We are the root object ... no need to lock. */
 300         free( p_this->p_libvlc->pp_objects );
 301         p_this->p_libvlc->pp_objects = NULL;
 302         p_this->p_libvlc->i_objects--;
 303
 304         vlc_mutex_destroy( &structure_lock );
 305     }
 306     else
 307     {
 308         int i_index;
 309
 310         vlc_mutex_lock( &structure_lock );
 311
 312         /* Wooohaa! If *this* fails, we're in serious trouble! Anyway it's
 313          * useless to try and recover anything if pp_objects gets smashed. */
 314         i_index = FindIndex( p_this, p_this->p_libvlc->pp_objects,
 315                              p_this->p_libvlc->i_objects );
 316         REMOVE_ELEM( p_this->p_libvlc->pp_objects,
 317                      p_this->p_libvlc->i_objects, i_index );
 318
 319         vlc_mutex_unlock( &structure_lock );
 320     }
 321
 322     vlc_mutex_destroy( &p_this->object_lock );
 323     vlc_cond_destroy( &p_this->object_wait );
 324
 325     free( p_this );
 326 }
 327
 328 /*****************************************************************************
 329  * vlc_object_get: find an object given its ID
 330  *****************************************************************************
 331  * This function looks for the object whose i_object_id field is i_id. We
 332  * use a dichotomy so that lookups are in log2(n).
 333  *****************************************************************************/
 334 void * __vlc_object_get( vlc_object_t *p_this, int i_id )
 335 {
 336     int i_max, i_middle;
 337     vlc_object_t **pp_objects;
 338
 339     vlc_mutex_lock( &structure_lock );
 340
 341     pp_objects = p_this->p_libvlc->pp_objects;
 342
 343     /* Perform our dichotomy */
 344     for( i_max = p_this->p_libvlc->i_objects - 1 ; ; )
 345     {
 346         i_middle = i_max / 2;
 347
 348         if( pp_objects[i_middle]->i_object_id > i_id )
 349         {
 350             i_max = i_middle;
 351         }
 352         else if( pp_objects[i_middle]->i_object_id < i_id )
 353         {
 354             if( i_middle )
 355             {
 356                 pp_objects += i_middle;
 357                 i_max -= i_middle;
 358             }
 359             else
 360             {
 361                 /* This happens when there are only two remaining objects */
 362                 if( pp_objects[i_middle+1]->i_object_id == i_id )
 363                 {
 364                     vlc_mutex_unlock( &structure_lock );
 365                     pp_objects[i_middle+1]->i_refcount++;
 366                     return pp_objects[i_middle+1];
 367                 }
 368                 break;
 369             }
 370         }
 371         else
 372         {
 373             vlc_mutex_unlock( &structure_lock );
 374             pp_objects[i_middle]->i_refcount++;
 375             return pp_objects[i_middle];
 376         }
 377
 378         if( i_max == 0 )
 379         {
 380             /* this means that i_max == i_middle, and since we have already
 381              * tested pp_objects[i_middle]), p_found is properly set. */
 382             break;
 383         }
 384     }
 385
 386     vlc_mutex_unlock( &structure_lock );
 387     return NULL;
 388 }
 389
 390 /*****************************************************************************
 391  * vlc_object_find: find a typed object and increment its refcount
 392  *****************************************************************************
 393  * This function recursively looks for a given object type. i_mode can be one
 394  * of FIND_PARENT, FIND_CHILD or FIND_ANYWHERE.
 395  *****************************************************************************/
 396 void * __vlc_object_find( vlc_object_t *p_this, int i_type, int i_mode )
 397 {
 398     vlc_object_t *p_found;
 399
 400     vlc_mutex_lock( &structure_lock );
 401
 402     /* If we are of the requested type ourselves, don't look further */
 403     if( !(i_mode & FIND_STRICT) && p_this->i_object_type == i_type )
 404     {
 405         p_this->i_refcount++;
 406         vlc_mutex_unlock( &structure_lock );
 407         return p_this;
 408     }
 409
 410     /* Otherwise, recursively look for the object */
 411     if( (i_mode & 0x000f) == FIND_ANYWHERE )
 412     {
 413         p_found = FindObject( VLC_OBJECT(p_this->p_vlc), i_type,
 414                               (i_mode & ~0x000f) | FIND_CHILD );
 415     }
 416     else
 417     {
 418         p_found = FindObject( p_this, i_type, i_mode );
 419     }
 420
 421     vlc_mutex_unlock( &structure_lock );
 422
 423     return p_found;
 424 }
 425
 426 /*****************************************************************************
 427  * vlc_object_yield: increment an object refcount
 428  *****************************************************************************/
 429 void __vlc_object_yield( vlc_object_t *p_this )
 430 {
 431     vlc_mutex_lock( &structure_lock );
 432     p_this->i_refcount++;
 433     vlc_mutex_unlock( &structure_lock );
 434 }
 435
 436 /*****************************************************************************
 437  * vlc_object_release: decrement an object refcount
 438  *****************************************************************************/
 439 void __vlc_object_release( vlc_object_t *p_this )
 440 {
 441     vlc_mutex_lock( &structure_lock );
 442     p_this->i_refcount--;
 443     vlc_mutex_unlock( &structure_lock );
 444 }
 445
 446 /*****************************************************************************
 447  * vlc_object_attach: attach object to a parent object
 448  *****************************************************************************
 449  * This function sets p_this as a child of p_parent, and p_parent as a parent
 450  * of p_this. This link can be undone using vlc_object_detach.
 451  *****************************************************************************/
 452 void __vlc_object_attach( vlc_object_t *p_this, vlc_object_t *p_parent )
 453 {
 454     vlc_mutex_lock( &structure_lock );
 455
 456     /* Attach the parent to its child */
 457     p_this->p_parent = p_parent;
 458
 459     /* Attach the child to its parent */
 460     INSERT_ELEM( p_parent->pp_children, p_parent->i_children,
 461                  p_parent->i_children, p_this );
 462
 463     /* Climb up the tree to see whether we are connected with the root */
 464     if( p_parent->b_attached )
 465     {
 466         SetAttachment( p_this, VLC_TRUE );
 467     }
 468
 469     vlc_mutex_unlock( &structure_lock );
 470 }
 471
 472 /*****************************************************************************
 473  * vlc_object_detach: detach object from its parent
 474  *****************************************************************************
 475  * This function removes all links between an object and its parent.
 476  *****************************************************************************/
 477 void __vlc_object_detach( vlc_object_t *p_this )
 478 {
 479     vlc_mutex_lock( &structure_lock );
 480     if( !p_this->p_parent )
 481     {
 482         msg_Err( p_this, "object is not attached" );
 483         vlc_mutex_unlock( &structure_lock );
 484         return;
 485     }
 486
 487     /* Climb up the tree to see whether we are connected with the root */
 488     if( p_this->p_parent->b_attached )
 489     {
 490         SetAttachment( p_this, VLC_FALSE );
 491     }
 492
 493     DetachObject( p_this );
 494     vlc_mutex_unlock( &structure_lock );
 495 }
 496
 497 /*****************************************************************************
 498  * vlc_list_find: find a list typed objects and increment their refcount
 499  *****************************************************************************
 500  * This function recursively looks for a given object type. i_mode can be one
 501  * of FIND_PARENT, FIND_CHILD or FIND_ANYWHERE.
 502  *****************************************************************************/
 503 vlc_list_t * __vlc_list_find( vlc_object_t *p_this, int i_type, int i_mode )
 504 {
 505     vlc_list_t *p_list;
 506     vlc_object_t **pp_current, **pp_end;
 507     int i_count = 0, i_index = 0;
 508
 509     vlc_mutex_lock( &structure_lock );
 510
 511     /* Look for the objects */
 512     switch( i_mode & 0x000f )
 513     {
 514     case FIND_ANYWHERE:
 515         pp_current = p_this->p_libvlc->pp_objects;
 516         pp_end = pp_current + p_this->p_libvlc->i_objects;
 517
 518         for( ; pp_current < pp_end ; pp_current++ )
 519         {
 520             if( (*pp_current)->b_attached
 521                  && (*pp_current)->i_object_type == i_type )
 522             {
 523                 i_count++;
 524             }
 525         }
 526
 527         p_list = NewList( i_count );
 528         pp_current = p_this->p_libvlc->pp_objects;
 529
 530         for( ; pp_current < pp_end ; pp_current++ )
 531         {
 532             if( (*pp_current)->b_attached
 533                  && (*pp_current)->i_object_type == i_type )
 534             {
 535                 ListReplace( p_list, *pp_current, i_index );
 536                 if( i_index < i_count ) i_index++;
 537             }
 538         }
 539     break;
 540
 541     case FIND_CHILD:
 542         i_count = CountChildren( p_this, i_type );
 543         p_list = NewList( i_count );
 544
 545         /* Check allocation was successful */
 546         if( p_list->i_count != i_count )
 547         {
 548             msg_Err( p_this, "list allocation failed!" );
 549             p_list->i_count = 0;
 550             break;
 551         }
 552
 553         p_list->i_count = 0;
 554         ListChildren( p_list, p_this, i_type );
 555         break;
 556
 557     default:
 558         msg_Err( p_this, "unimplemented!" );
 559         p_list = NewList( 0 );
 560         break;
 561     }
 562
 563     vlc_mutex_unlock( &structure_lock );
 564
 565     return p_list;
 566 }
 567
 568 /*****************************************************************************
 569  * DumpCommand: print the current vlc structure
 570  *****************************************************************************
 571  * This function prints either an ASCII tree showing the connections between
 572  * vlc objects, and additional information such as their refcount, thread ID,
 573  * etc. (command "tree"), or the same data as a simple list (command "list").
 574  *****************************************************************************/
 575 static int DumpCommand( vlc_object_t *p_this, char const *psz_cmd,
 576                         vlc_value_t oldval, vlc_value_t newval, void *p_data )
 577 {
 578     if( *psz_cmd == 't' )
 579     {
 580         char psz_foo[2 * MAX_DUMPSTRUCTURE_DEPTH + 1];
 581         vlc_object_t *p_object;
 582
 583         if( *newval.psz_string )
 584         {
 585             p_object = vlc_object_get( p_this, atoi(newval.psz_string) );
 586
 587             if( !p_object )
 588             {
 589                 return VLC_ENOOBJ;
 590             }
 591         }
 592         else
 593         {
 594             p_object = p_this->p_vlc ? VLC_OBJECT(p_this->p_vlc) : p_this;
 595         }
 596
 597         vlc_mutex_lock( &structure_lock );
 598
 599         psz_foo[0] = '|';
 600         DumpStructure( p_object, 0, psz_foo );
 601
 602         vlc_mutex_unlock( &structure_lock );
 603
 604         if( *newval.psz_string )
 605         {
 606             vlc_object_release( p_this );
 607         }
 608     }
 609     else if( *psz_cmd == 'l' )
 610     {
 611         vlc_object_t **pp_current, **pp_end;
 612
 613         vlc_mutex_lock( &structure_lock );
 614
 615         pp_current = p_this->p_libvlc->pp_objects;
 616         pp_end = pp_current + p_this->p_libvlc->i_objects;
 617
 618         for( ; pp_current < pp_end ; pp_current++ )
 619         {
 620             if( (*pp_current)->b_attached )
 621             {
 622                 PrintObject( *pp_current, "" );
 623             }
 624             else
 625             {
 626                 printf( " o %.8i %s (not attached)\n",
 627                         (*pp_current)->i_object_id,
 628                         (*pp_current)->psz_object_type );
 629             }
 630         }
 631
 632         vlc_mutex_unlock( &structure_lock );
 633     }
 634
 635     return VLC_SUCCESS;
 636 }
 637
 638 /*****************************************************************************
 639  * vlc_list_release: free a list previously allocated by vlc_list_find
 640  *****************************************************************************
 641  * This function decreases the refcount of all objects in the list and
 642  * frees the list.
 643  *****************************************************************************/
 644 void vlc_list_release( vlc_list_t *p_list )
 645 {
 646     int i_index;
 647
 648     for( i_index = 0; i_index < p_list->i_count; i_index++ )
 649     {
 650         vlc_mutex_lock( &structure_lock );
 651
 652         p_list->p_values[i_index].p_object->i_refcount--;
 653
 654         vlc_mutex_unlock( &structure_lock );
 655     }
 656
 657     free( p_list->p_values );
 658     free( p_list );
 659 }
 660
 661 /* Following functions are local */
 662
 663 /*****************************************************************************
 664  * FindIndex: find the index of an object in an array of objects
 665  *****************************************************************************
 666  * This function assumes that p_this can be found in pp_objects. It will not
 667  * crash if p_this cannot be found, but will return a wrong value. It is your
 668  * duty to check the return value if you are not certain that the object could
 669  * be found for sure.
 670  *****************************************************************************/
 671 static int FindIndex( vlc_object_t *p_this,
 672                       vlc_object_t **pp_objects, int i_count )
 673 {
 674     int i_middle = i_count / 2;
 675
 676     if( i_count == 0 )
 677     {
 678         return 0;
 679     }
 680
 681     if( pp_objects[i_middle] == p_this )
 682     {
 683         return i_middle;
 684     }
 685
 686     if( i_count == 1 )
 687     {
 688         return 0;
 689     }
 690
 691     /* We take advantage of the sorted array */
 692     if( pp_objects[i_middle]->i_object_id < p_this->i_object_id )
 693     {
 694         return i_middle + FindIndex( p_this, pp_objects + i_middle,
 695                                              i_count - i_middle );
 696     }
 697     else
 698     {
 699         return FindIndex( p_this, pp_objects, i_middle );
 700     }
 701 }
 702
 703 static vlc_object_t * FindObject( vlc_object_t *p_this, int i_type, int i_mode )
 704 {
 705     int i;
 706     vlc_object_t *p_tmp;
 707
 708     switch( i_mode & 0x000f )
 709     {
 710     case FIND_PARENT:
 711         p_tmp = p_this->p_parent;
 712         if( p_tmp )
 713         {
 714             if( p_tmp->i_object_type == i_type )
 715             {
 716                 p_tmp->i_refcount++;
 717                 return p_tmp;
 718             }
 719             else
 720             {
 721                 return FindObject( p_tmp, i_type, i_mode );
 722             }
 723         }
 724         break;
 725
 726     case FIND_CHILD:
 727         for( i = p_this->i_children; i--; )
 728         {
 729             p_tmp = p_this->pp_children[i];
 730             if( p_tmp->i_object_type == i_type )
 731             {
 732                 p_tmp->i_refcount++;
 733                 return p_tmp;
 734             }
 735             else if( p_tmp->i_children )
 736             {
 737                 p_tmp = FindObject( p_tmp, i_type, i_mode );
 738                 if( p_tmp )
 739                 {
 740                     return p_tmp;
 741                 }
 742             }
 743         }
 744         break;
 745
 746     case FIND_ANYWHERE:
 747         /* Handled in vlc_object_find */
 748         break;
 749     }
 750
 751     return NULL;
 752 }
 753
 754 static void DetachObject( vlc_object_t *p_this )
 755 {
 756     vlc_object_t *p_parent = p_this->p_parent;
 757     int i_index, i;
 758
 759     /* Remove p_this's parent */
 760     p_this->p_parent = NULL;
 761
 762     /* Remove all of p_parent's children which are p_this */
 763     for( i_index = p_parent->i_children ; i_index-- ; )
 764     {
 765         if( p_parent->pp_children[i_index] == p_this )
 766         {
 767             p_parent->i_children--;
 768             for( i = i_index ; i < p_parent->i_children ; i++ )
 769             {
 770                 p_parent->pp_children[i] = p_parent->pp_children[i+1];
 771             }
 772         }
 773     }
 774
 775     if( p_parent->i_children )
 776     {
 777         p_parent->pp_children = (vlc_object_t **)realloc( p_parent->pp_children,
 778                                p_parent->i_children * sizeof(vlc_object_t *) );
 779     }
 780     else
 781     {
 782         free( p_parent->pp_children );
 783         p_parent->pp_children = NULL;
 784     }
 785 }
 786
 787 /*****************************************************************************
 788  * SetAttachment: recursively set the b_attached flag of a subtree.
 789  *****************************************************************************
 790  * This function is used by the attach and detach functions to propagate
 791  * the b_attached flag in a subtree.
 792  *****************************************************************************/
 793 static void SetAttachment( vlc_object_t *p_this, vlc_bool_t b_attached )
 794 {
 795     int i_index;
 796
 797     for( i_index = p_this->i_children ; i_index-- ; )
 798     {
 799         SetAttachment( p_this->pp_children[i_index], b_attached );
 800     }
 801
 802     p_this->b_attached = b_attached;
 803 }
 804
 805 static void PrintObject( vlc_object_t *p_this, const char *psz_prefix )
 806 {
 807     char psz_children[20], psz_refcount[20], psz_thread[20], psz_name[50];
 808
 809     psz_name[0] = '\0';
 810     if( p_this->psz_object_name )
 811     {
 812         snprintf( psz_name, 50, " \"%s\"", p_this->psz_object_name );
 813         psz_name[48] = '\"';
 814         psz_name[49] = '\0';
 815     }
 816
 817     psz_children[0] = '\0';
 818     switch( p_this->i_children )
 819     {
 820         case 0:
 821             break;
 822         case 1:
 823             strcpy( psz_children, ", 1 child" );
 824             break;
 825         default:
 826             snprintf( psz_children, 20,
 827                       ", %i children", p_this->i_children );
 828             psz_children[19] = '\0';
 829             break;
 830     }
 831
 832     psz_refcount[0] = '\0';
 833     if( p_this->i_refcount )
 834     {
 835         snprintf( psz_refcount, 20, ", refcount %i", p_this->i_refcount );
 836         psz_refcount[19] = '\0';
 837     }
 838
 839     psz_thread[0] = '\0';
 840     if( p_this->b_thread )
 841     {
 842         snprintf( psz_thread, 20, " (thread %d)", (int)p_this->thread_id );
 843         psz_thread[19] = '\0';
 844     }
 845
 846     printf( " %so %.8i %s%s%s%s%s\n", psz_prefix,
 847             p_this->i_object_id, p_this->psz_object_type,
 848             psz_name, psz_thread, psz_refcount, psz_children );
 849 }
 850
 851 static void DumpStructure( vlc_object_t *p_this, int i_level, char *psz_foo )
 852 {
 853     int i;
 854     char i_back = psz_foo[i_level];
 855     psz_foo[i_level] = '\0';
 856
 857     PrintObject( p_this, psz_foo );
 858
 859     psz_foo[i_level] = i_back;
 860
 861     if( i_level / 2 >= MAX_DUMPSTRUCTURE_DEPTH )
 862     {
 863         msg_Warn( p_this, "structure tree is too deep" );
 864         return;
 865     }
 866
 867     for( i = 0 ; i < p_this->i_children ; i++ )
 868     {
 869         if( i_level )
 870         {
 871             psz_foo[i_level-1] = ' ';
 872
 873             if( psz_foo[i_level-2] == '`' )
 874             {
 875                 psz_foo[i_level-2] = ' ';
 876             }
 877         }
 878
 879         if( i == p_this->i_children - 1 )
 880         {
 881             psz_foo[i_level] = '`';
 882         }
 883         else
 884         {
 885             psz_foo[i_level] = '|';
 886         }
 887
 888         psz_foo[i_level+1] = '-';
 889         psz_foo[i_level+2] = '\0';
 890
 891         DumpStructure( p_this->pp_children[i], i_level + 2, psz_foo );
 892     }
 893 }
 894
 895 static vlc_list_t * NewList( int i_count )
 896 {
 897     vlc_list_t * p_list = (vlc_list_t *)malloc( sizeof( vlc_list_t ) );
 898     if( p_list == NULL )
 899     {
 900         return NULL;
 901     }
 902
 903     p_list->i_count = i_count;
 904
 905     if( i_count == 0 )
 906     {
 907         p_list->p_values = NULL;
 908         return p_list;
 909     }
 910
 911     p_list->p_values = malloc( i_count * sizeof( vlc_value_t ) );
 912     if( p_list->p_values == NULL )
 913     {
 914         p_list->i_count = 0;
 915         return p_list;
 916     }
 917
 918     return p_list;
 919 }
 920
 921 static void ListReplace( vlc_list_t *p_list, vlc_object_t *p_object,
 922                          int i_index )
 923 {
 924     if( p_list == NULL || i_index >= p_list->i_count )
 925     {
 926         return;
 927     }
 928
 929     p_object->i_refcount++;
 930
 931     p_list->p_values[i_index].p_object = p_object;
 932
 933     return;
 934 }
 935
 936 static void ListAppend( vlc_list_t *p_list, vlc_object_t *p_object )
 937 {
 938     if( p_list == NULL )
 939     {
 940         return;
 941     }
 942
 943     p_list->p_values = realloc( p_list->p_values, (p_list->i_count + 1)
 944                                 * sizeof( vlc_value_t ) );
 945     if( p_list->p_values == NULL )
 946     {
 947         p_list->i_count = 0;
 948         return;
 949     }
 950
 951     p_object->i_refcount++;
 952
 953     p_list->p_values[p_list->i_count].p_object = p_object;
 954     p_list->i_count++;
 955
 956     return;
 957 }
 958
 959 static int CountChildren( vlc_object_t *p_this, int i_type )
 960 {
 961     vlc_object_t *p_tmp;
 962     int i, i_count = 0;
 963
 964     for( i = 0; i < p_this->i_children; i++ )
 965     {
 966         p_tmp = p_this->pp_children[i];
 967
 968         if( p_tmp->i_object_type == i_type )
 969         {
 970             i_count++;
 971         }
 972
 973         if( p_tmp->i_children )
 974         {
 975             i_count += CountChildren( p_tmp, i_type );
 976         }
 977     }
 978
 979     return i_count;
 980 }
 981
 982 static void ListChildren( vlc_list_t *p_list, vlc_object_t *p_this, int i_type )
 983 {
 984     vlc_object_t *p_tmp;
 985     int i;
 986
 987     for( i = 0; i < p_this->i_children; i++ )
 988     {
 989         p_tmp = p_this->pp_children[i];
 990
 991         if( p_tmp->i_object_type == i_type )
 992         {
 993             ListReplace( p_list, p_tmp, p_list->i_count++ );
 994         }
 995
 996         if( p_tmp->i_children )
 997         {
 998             ListChildren( p_list, p_tmp, i_type );
 999         }
1000     }
1001 }