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 1.39 2003/09/18 17:54:02 zorglub 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  * \file
  26  * This file contains the functions to handle the vlc_object_t type
  27  */
  28
  29
  30 /*****************************************************************************
  31  * Preamble
  32  *****************************************************************************/
  33 #include <vlc/vlc.h>
  34
  35 #ifdef HAVE_STDLIB_H
  36 #   include <stdlib.h>                                          /* realloc() */
  37 #endif
  38
  39 #include "stream_control.h"
  40 #include "input_ext-intf.h"
  41 #include "input_ext-dec.h"
  42
  43 #include "vlc_video.h"
  44 #include "video_output.h"
  45
  46 #include "audio_output.h"
  47 #include "aout_internal.h"
  48 #include "stream_output.h"
  49
  50 #include "vlc_playlist.h"
  51 #include "vlc_interface.h"
  52
  53 #include "httpd.h"
  54 /*****************************************************************************
  55  * Local prototypes
  56  *****************************************************************************/
  57 static int  DumpCommand( vlc_object_t *, char const *,
  58                          vlc_value_t, vlc_value_t, void * );
  59
  60 static vlc_object_t * FindObject    ( vlc_object_t *, int, int );
  61 static void           DetachObject  ( vlc_object_t * );
  62 static void           PrintObject   ( vlc_object_t *, const char * );
  63 static void           DumpStructure ( vlc_object_t *, int, char * );
  64 static int            FindIndex     ( vlc_object_t *, vlc_object_t **, int );
  65 static void           SetAttachment ( vlc_object_t *, vlc_bool_t );
  66
  67 static vlc_list_t   * NewList       ( int );
  68 static void           ListReplace   ( vlc_list_t *, vlc_object_t *, int );
  69 static void           ListAppend    ( vlc_list_t *, vlc_object_t * );
  70 static int            CountChildren ( vlc_object_t *, int );
  71 static void           ListChildren  ( vlc_list_t *, vlc_object_t *, int );
  72
  73 /*****************************************************************************
  74  * Local structure lock
  75  *****************************************************************************/
  76 static vlc_mutex_t    structure_lock;
  77
  78 /*****************************************************************************
  79  * vlc_object_create: initialize a vlc object
  80  *****************************************************************************
  81  * This function allocates memory for a vlc object and initializes it. If
  82  * i_type is not a known value such as VLC_OBJECT_ROOT, VLC_OBJECT_VOUT and
  83  * so on, vlc_object_create will use its value for the object size.
  84  *****************************************************************************/
  85
  86 /**
  87  * Initialize a vlc object
  88  *
  89  * This function allocates memory for a vlc object and initializes it. If
  90  * i_type is not a known value such as VLC_OBJECT_ROOT, VLC_OBJECT_VOUT and
  91  * so on, vlc_object_create will use its value for the object size.
  92  */
  93 void * __vlc_object_create( vlc_object_t *p_this, int i_type )
  94 {
  95     vlc_object_t * p_new;
  96     char *         psz_type;
  97     size_t         i_size;
  98
  99     switch( i_type )
 100     {
 101         case VLC_OBJECT_ROOT:
 102             i_size = sizeof(libvlc_t);
 103             psz_type = "root";
 104             break;
 105         case VLC_OBJECT_VLC:
 106             i_size = sizeof(vlc_t);
 107             psz_type = "vlc";
 108             break;
 109         case VLC_OBJECT_MODULE:
 110             i_size = sizeof(module_t);
 111             psz_type = "module";
 112             break;
 113         case VLC_OBJECT_INTF:
 114             i_size = sizeof(intf_thread_t);
 115             psz_type = "interface";
 116             break;
 117         case VLC_OBJECT_PLAYLIST:
 118             i_size = sizeof(playlist_t);
 119             psz_type = "playlist";
 120             break;
 121         case VLC_OBJECT_INPUT:
 122             i_size = sizeof(input_thread_t);
 123             psz_type = "input";
 124             break;
 125         case VLC_OBJECT_DECODER:
 126             i_size = sizeof(decoder_t);
 127             psz_type = "decoder";
 128             break;
 129         case VLC_OBJECT_DECODER_FIFO: /* tmp for backward compat */
 130             i_size = sizeof(decoder_fifo_t);
 131             psz_type = "decoder";
 132             break;
 133         case VLC_OBJECT_VOUT:
 134             i_size = sizeof(vout_thread_t);
 135             psz_type = "video output";
 136             break;
 137         case VLC_OBJECT_AOUT:
 138             i_size = sizeof(aout_instance_t);
 139             psz_type = "audio output";
 140             break;
 141         case VLC_OBJECT_SOUT:
 142             i_size = sizeof(sout_instance_t);
 143             psz_type = "stream output";
 144             break;
 145         case VLC_OBJECT_HTTPD:
 146             i_size = sizeof( httpd_t );
 147             psz_type = "http daemon";
 148             break;
 149         default:
 150             i_size = i_type > 0
 151                       ? i_type > (int)sizeof(vlc_object_t)
 152                          ? i_type : (int)sizeof(vlc_object_t)
 153                       : (int)sizeof(vlc_object_t);
 154             i_type = VLC_OBJECT_GENERIC;
 155             psz_type = "generic";
 156             break;
 157     }
 158
 159     if( i_type == VLC_OBJECT_ROOT )
 160     {
 161         p_new = p_this;
 162     }
 163     else
 164     {
 165         p_new = malloc( i_size );
 166
 167         if( !p_new )
 168         {
 169             return NULL;
 170         }
 171
 172         memset( p_new, 0, i_size );
 173     }
 174
 175     p_new->i_object_type = i_type;
 176     p_new->psz_object_type = psz_type;
 177
 178     p_new->psz_object_name = NULL;
 179
 180     p_new->b_die = VLC_FALSE;
 181     p_new->b_error = VLC_FALSE;
 182     p_new->b_dead = VLC_FALSE;
 183     p_new->b_attached = VLC_FALSE;
 184
 185     p_new->i_vars = 0;
 186     p_new->p_vars = (variable_t *)malloc( 16 * sizeof( variable_t ) );
 187
 188     if( !p_new->p_vars )
 189     {
 190         free( p_new );
 191         return NULL;
 192     }
 193
 194     if( i_type == VLC_OBJECT_ROOT )
 195     {
 196         /* If i_type is root, then p_new is actually p_libvlc */
 197         p_new->p_libvlc = (libvlc_t*)p_new;
 198         p_new->p_vlc = NULL;
 199
 200         p_new->p_libvlc->i_counter = 0;
 201         p_new->i_object_id = 0;
 202
 203         p_new->p_libvlc->i_objects = 1;
 204         p_new->p_libvlc->pp_objects = malloc( sizeof(vlc_object_t *) );
 205         p_new->p_libvlc->pp_objects[0] = p_new;
 206         p_new->b_attached = VLC_TRUE;
 207     }
 208     else
 209     {
 210         p_new->p_libvlc = p_this->p_libvlc;
 211         p_new->p_vlc = ( i_type == VLC_OBJECT_VLC ) ? (vlc_t*)p_new
 212                                                     : p_this->p_vlc;
 213
 214         vlc_mutex_lock( &structure_lock );
 215
 216         p_new->p_libvlc->i_counter++;
 217         p_new->i_object_id = p_new->p_libvlc->i_counter;
 218
 219         /* Wooohaa! If *this* fails, we're in serious trouble! Anyway it's
 220          * useless to try and recover anything if pp_objects gets smashed. */
 221         INSERT_ELEM( p_new->p_libvlc->pp_objects,
 222                      p_new->p_libvlc->i_objects,
 223                      p_new->p_libvlc->i_objects,
 224                      p_new );
 225
 226         vlc_mutex_unlock( &structure_lock );
 227     }
 228
 229     p_new->i_refcount = 0;
 230     p_new->p_parent = NULL;
 231     p_new->pp_children = NULL;
 232     p_new->i_children = 0;
 233
 234     p_new->p_private = NULL;
 235
 236     /* Initialize mutexes and condvars */
 237     vlc_mutex_init( p_new, &p_new->object_lock );
 238     vlc_cond_init( p_new, &p_new->object_wait );
 239     vlc_mutex_init( p_new, &p_new->var_lock );
 240
 241     if( i_type == VLC_OBJECT_ROOT )
 242     {
 243         vlc_mutex_init( p_new, &structure_lock );
 244
 245         var_Create( p_new, "list", VLC_VAR_STRING | VLC_VAR_ISCOMMAND );
 246         var_AddCallback( p_new, "list", DumpCommand, NULL );
 247         var_Create( p_new, "tree", VLC_VAR_STRING | VLC_VAR_ISCOMMAND );
 248         var_AddCallback( p_new, "tree", DumpCommand, NULL );
 249     }
 250
 251     return p_new;
 252 }
 253
 254 /**
 255  ****************************************************************************
 256  * Destroy a vlc object
 257  *
 258  * This function destroys an object that has been previously allocated with
 259  * vlc_object_create. The object's refcount must be zero and it must not be
 260  * attached to other objects in any way.
 261  *****************************************************************************/
 262 void __vlc_object_destroy( vlc_object_t *p_this )
 263 {
 264     int i_delay = 0;
 265
 266     if( p_this->i_children )
 267     {
 268         msg_Err( p_this, "cannot delete object with children" );
 269         return;
 270     }
 271
 272     if( p_this->p_parent )
 273     {
 274         msg_Err( p_this, "cannot delete object with a parent" );
 275         return;
 276     }
 277
 278     while( p_this->i_refcount )
 279     {
 280         i_delay++;
 281
 282         /* Don't warn immediately ... 100ms seems OK */
 283         if( i_delay == 2 )
 284         {
 285             msg_Warn( p_this, "refcount is %i, delaying before deletion",
 286                               p_this->i_refcount );
 287         }
 288         else if( i_delay == 12 )
 289         {
 290             msg_Err( p_this, "refcount is %i, I have a bad feeling about this",
 291                              p_this->i_refcount );
 292         }
 293         else if( i_delay == 42 )
 294         {
 295             msg_Err( p_this, "we waited too long, cancelling destruction" );
 296             return;
 297         }
 298
 299         msleep( 100000 );
 300     }
 301
 302     /* Destroy the associated variables, starting from the end so that
 303      * no memmove calls have to be done. */
 304     while( p_this->i_vars )
 305     {
 306         var_Destroy( p_this, p_this->p_vars[p_this->i_vars - 1].psz_name );
 307     }
 308
 309     free( p_this->p_vars );
 310     vlc_mutex_destroy( &p_this->var_lock );
 311
 312     if( p_this->i_object_type == VLC_OBJECT_ROOT )
 313     {
 314         /* We are the root object ... no need to lock. */
 315         free( p_this->p_libvlc->pp_objects );
 316         p_this->p_libvlc->pp_objects = NULL;
 317         p_this->p_libvlc->i_objects--;
 318
 319         vlc_mutex_destroy( &structure_lock );
 320     }
 321     else
 322     {
 323         int i_index;
 324
 325         vlc_mutex_lock( &structure_lock );
 326
 327         /* Wooohaa! If *this* fails, we're in serious trouble! Anyway it's
 328          * useless to try and recover anything if pp_objects gets smashed. */
 329         i_index = FindIndex( p_this, p_this->p_libvlc->pp_objects,
 330                              p_this->p_libvlc->i_objects );
 331         REMOVE_ELEM( p_this->p_libvlc->pp_objects,
 332                      p_this->p_libvlc->i_objects, i_index );
 333
 334         vlc_mutex_unlock( &structure_lock );
 335     }
 336
 337     vlc_mutex_destroy( &p_this->object_lock );
 338     vlc_cond_destroy( &p_this->object_wait );
 339
 340     free( p_this );
 341 }
 342
 343 /**
 344  * find an object given its ID
 345  *
 346  * This function looks for the object whose i_object_id field is i_id. We
 347  * use a dichotomy so that lookups are in log2(n).
 348  *****************************************************************************/
 349 void * __vlc_object_get( vlc_object_t *p_this, int i_id )
 350 {
 351     int i_max, i_middle;
 352     vlc_object_t **pp_objects;
 353
 354     vlc_mutex_lock( &structure_lock );
 355
 356     pp_objects = p_this->p_libvlc->pp_objects;
 357
 358     /* Perform our dichotomy */
 359     for( i_max = p_this->p_libvlc->i_objects - 1 ; ; )
 360     {
 361         i_middle = i_max / 2;
 362
 363         if( pp_objects[i_middle]->i_object_id > i_id )
 364         {
 365             i_max = i_middle;
 366         }
 367         else if( pp_objects[i_middle]->i_object_id < i_id )
 368         {
 369             if( i_middle )
 370             {
 371                 pp_objects += i_middle;
 372                 i_max -= i_middle;
 373             }
 374             else
 375             {
 376                 /* This happens when there are only two remaining objects */
 377                 if( pp_objects[i_middle+1]->i_object_id == i_id )
 378                 {
 379                     vlc_mutex_unlock( &structure_lock );
 380                     pp_objects[i_middle+1]->i_refcount++;
 381                     return pp_objects[i_middle+1];
 382                 }
 383                 break;
 384             }
 385         }
 386         else
 387         {
 388             vlc_mutex_unlock( &structure_lock );
 389             pp_objects[i_middle]->i_refcount++;
 390             return pp_objects[i_middle];
 391         }
 392
 393         if( i_max == 0 )
 394         {
 395             /* this means that i_max == i_middle, and since we have already
 396              * tested pp_objects[i_middle]), p_found is properly set. */
 397             break;
 398         }
 399     }
 400
 401     vlc_mutex_unlock( &structure_lock );
 402     return NULL;
 403 }
 404
 405 /**
 406  ****************************************************************************
 407  * find a typed object and increment its refcount
 408  *****************************************************************************
 409  * This function recursively looks for a given object type. i_mode can be one
 410  * of FIND_PARENT, FIND_CHILD or FIND_ANYWHERE.
 411  *****************************************************************************/
 412 void * __vlc_object_find( vlc_object_t *p_this, int i_type, int i_mode )
 413 {
 414     vlc_object_t *p_found;
 415
 416     vlc_mutex_lock( &structure_lock );
 417
 418     /* If we are of the requested type ourselves, don't look further */
 419     if( !(i_mode & FIND_STRICT) && p_this->i_object_type == i_type )
 420     {
 421         p_this->i_refcount++;
 422         vlc_mutex_unlock( &structure_lock );
 423         return p_this;
 424     }
 425
 426     /* Otherwise, recursively look for the object */
 427     if( (i_mode & 0x000f) == FIND_ANYWHERE )
 428     {
 429         p_found = FindObject( VLC_OBJECT(p_this->p_vlc), i_type,
 430                               (i_mode & ~0x000f) | FIND_CHILD );
 431     }
 432     else
 433     {
 434         p_found = FindObject( p_this, i_type, i_mode );
 435     }
 436
 437     vlc_mutex_unlock( &structure_lock );
 438
 439     return p_found;
 440 }
 441
 442 /**
 443  ****************************************************************************
 444  * increment an object refcount
 445  *****************************************************************************/
 446 void __vlc_object_yield( vlc_object_t *p_this )
 447 {
 448     vlc_mutex_lock( &structure_lock );
 449     p_this->i_refcount++;
 450     vlc_mutex_unlock( &structure_lock );
 451 }
 452
 453 /**
 454  ****************************************************************************
 455  * decrement an object refcount
 456  *****************************************************************************/
 457 void __vlc_object_release( vlc_object_t *p_this )
 458 {
 459     vlc_mutex_lock( &structure_lock );
 460     p_this->i_refcount--;
 461     vlc_mutex_unlock( &structure_lock );
 462 }
 463
 464 /**
 465  ****************************************************************************
 466  * attach object to a parent object
 467  *****************************************************************************
 468  * This function sets p_this as a child of p_parent, and p_parent as a parent
 469  * of p_this. This link can be undone using vlc_object_detach.
 470  *****************************************************************************/
 471 void __vlc_object_attach( vlc_object_t *p_this, vlc_object_t *p_parent )
 472 {
 473     vlc_mutex_lock( &structure_lock );
 474
 475     /* Attach the parent to its child */
 476     p_this->p_parent = p_parent;
 477
 478     /* Attach the child to its parent */
 479     INSERT_ELEM( p_parent->pp_children, p_parent->i_children,
 480                  p_parent->i_children, p_this );
 481
 482     /* Climb up the tree to see whether we are connected with the root */
 483     if( p_parent->b_attached )
 484     {
 485         SetAttachment( p_this, VLC_TRUE );
 486     }
 487
 488     vlc_mutex_unlock( &structure_lock );
 489 }
 490
 491 /**
 492  ****************************************************************************
 493  * detach object from its parent
 494  *****************************************************************************
 495  * This function removes all links between an object and its parent.
 496  *****************************************************************************/
 497 void __vlc_object_detach( vlc_object_t *p_this )
 498 {
 499     vlc_mutex_lock( &structure_lock );
 500     if( !p_this->p_parent )
 501     {
 502         msg_Err( p_this, "object is not attached" );
 503         vlc_mutex_unlock( &structure_lock );
 504         return;
 505     }
 506
 507     /* Climb up the tree to see whether we are connected with the root */
 508     if( p_this->p_parent->b_attached )
 509     {
 510         SetAttachment( p_this, VLC_FALSE );
 511     }
 512
 513     DetachObject( p_this );
 514     vlc_mutex_unlock( &structure_lock );
 515 }
 516
 517 /**
 518  ****************************************************************************
 519  * find a list typed objects and increment their refcount
 520  *****************************************************************************
 521  * This function recursively looks for a given object type. i_mode can be one
 522  * of FIND_PARENT, FIND_CHILD or FIND_ANYWHERE.
 523  *****************************************************************************/
 524 vlc_list_t * __vlc_list_find( vlc_object_t *p_this, int i_type, int i_mode )
 525 {
 526     vlc_list_t *p_list;
 527     vlc_object_t **pp_current, **pp_end;
 528     int i_count = 0, i_index = 0;
 529
 530     vlc_mutex_lock( &structure_lock );
 531
 532     /* Look for the objects */
 533     switch( i_mode & 0x000f )
 534     {
 535     case FIND_ANYWHERE:
 536         pp_current = p_this->p_libvlc->pp_objects;
 537         pp_end = pp_current + p_this->p_libvlc->i_objects;
 538
 539         for( ; pp_current < pp_end ; pp_current++ )
 540         {
 541             if( (*pp_current)->b_attached
 542                  && (*pp_current)->i_object_type == i_type )
 543             {
 544                 i_count++;
 545             }
 546         }
 547
 548         p_list = NewList( i_count );
 549         pp_current = p_this->p_libvlc->pp_objects;
 550
 551         for( ; pp_current < pp_end ; pp_current++ )
 552         {
 553             if( (*pp_current)->b_attached
 554                  && (*pp_current)->i_object_type == i_type )
 555             {
 556                 ListReplace( p_list, *pp_current, i_index );
 557                 if( i_index < i_count ) i_index++;
 558             }
 559         }
 560     break;
 561
 562     case FIND_CHILD:
 563         i_count = CountChildren( p_this, i_type );
 564         p_list = NewList( i_count );
 565
 566         /* Check allocation was successful */
 567         if( p_list->i_count != i_count )
 568         {
 569             msg_Err( p_this, "list allocation failed!" );
 570             p_list->i_count = 0;
 571             break;
 572         }
 573
 574         p_list->i_count = 0;
 575         ListChildren( p_list, p_this, i_type );
 576         break;
 577
 578     default:
 579         msg_Err( p_this, "unimplemented!" );
 580         p_list = NewList( 0 );
 581         break;
 582     }
 583
 584     vlc_mutex_unlock( &structure_lock );
 585
 586     return p_list;
 587 }
 588
 589 /*****************************************************************************
 590  * DumpCommand: print the current vlc structure
 591  *****************************************************************************
 592  * This function prints either an ASCII tree showing the connections between
 593  * vlc objects, and additional information such as their refcount, thread ID,
 594  * etc. (command "tree"), or the same data as a simple list (command "list").
 595  *****************************************************************************/
 596 static int DumpCommand( vlc_object_t *p_this, char const *psz_cmd,
 597                         vlc_value_t oldval, vlc_value_t newval, void *p_data )
 598 {
 599     if( *psz_cmd == 't' )
 600     {
 601         char psz_foo[2 * MAX_DUMPSTRUCTURE_DEPTH + 1];
 602         vlc_object_t *p_object;
 603
 604         if( *newval.psz_string )
 605         {
 606             p_object = vlc_object_get( p_this, atoi(newval.psz_string) );
 607
 608             if( !p_object )
 609             {
 610                 return VLC_ENOOBJ;
 611             }
 612         }
 613         else
 614         {
 615             p_object = p_this->p_vlc ? VLC_OBJECT(p_this->p_vlc) : p_this;
 616         }
 617
 618         vlc_mutex_lock( &structure_lock );
 619
 620         psz_foo[0] = '|';
 621         DumpStructure( p_object, 0, psz_foo );
 622
 623         vlc_mutex_unlock( &structure_lock );
 624
 625         if( *newval.psz_string )
 626         {
 627             vlc_object_release( p_this );
 628         }
 629     }
 630     else if( *psz_cmd == 'l' )
 631     {
 632         vlc_object_t **pp_current, **pp_end;
 633
 634         vlc_mutex_lock( &structure_lock );
 635
 636         pp_current = p_this->p_libvlc->pp_objects;
 637         pp_end = pp_current + p_this->p_libvlc->i_objects;
 638
 639         for( ; pp_current < pp_end ; pp_current++ )
 640         {
 641             if( (*pp_current)->b_attached )
 642             {
 643                 PrintObject( *pp_current, "" );
 644             }
 645             else
 646             {
 647                 printf( " o %.8i %s (not attached)\n",
 648                         (*pp_current)->i_object_id,
 649                         (*pp_current)->psz_object_type );
 650             }
 651         }
 652
 653         vlc_mutex_unlock( &structure_lock );
 654     }
 655
 656     return VLC_SUCCESS;
 657 }
 658
 659 /*****************************************************************************
 660  * vlc_list_release: free a list previously allocated by vlc_list_find
 661  *****************************************************************************
 662  * This function decreases the refcount of all objects in the list and
 663  * frees the list.
 664  *****************************************************************************/
 665 void vlc_list_release( vlc_list_t *p_list )
 666 {
 667     int i_index;
 668
 669     for( i_index = 0; i_index < p_list->i_count; i_index++ )
 670     {
 671         vlc_mutex_lock( &structure_lock );
 672
 673         p_list->p_values[i_index].p_object->i_refcount--;
 674
 675         vlc_mutex_unlock( &structure_lock );
 676     }
 677
 678     free( p_list->p_values );
 679     free( p_list );
 680 }
 681
 682 /* Following functions are local */
 683
 684 /*****************************************************************************
 685  * FindIndex: find the index of an object in an array of objects
 686  *****************************************************************************
 687  * This function assumes that p_this can be found in pp_objects. It will not
 688  * crash if p_this cannot be found, but will return a wrong value. It is your
 689  * duty to check the return value if you are not certain that the object could
 690  * be found for sure.
 691  *****************************************************************************/
 692 static int FindIndex( vlc_object_t *p_this,
 693                       vlc_object_t **pp_objects, int i_count )
 694 {
 695     int i_middle = i_count / 2;
 696
 697     if( i_count == 0 )
 698     {
 699         return 0;
 700     }
 701
 702     if( pp_objects[i_middle] == p_this )
 703     {
 704         return i_middle;
 705     }
 706
 707     if( i_count == 1 )
 708     {
 709         return 0;
 710     }
 711
 712     /* We take advantage of the sorted array */
 713     if( pp_objects[i_middle]->i_object_id < p_this->i_object_id )
 714     {
 715         return i_middle + FindIndex( p_this, pp_objects + i_middle,
 716                                              i_count - i_middle );
 717     }
 718     else
 719     {
 720         return FindIndex( p_this, pp_objects, i_middle );
 721     }
 722 }
 723
 724 static vlc_object_t * FindObject( vlc_object_t *p_this, int i_type, int i_mode )
 725 {
 726     int i;
 727     vlc_object_t *p_tmp;
 728
 729     switch( i_mode & 0x000f )
 730     {
 731     case FIND_PARENT:
 732         p_tmp = p_this->p_parent;
 733         if( p_tmp )
 734         {
 735             if( p_tmp->i_object_type == i_type )
 736             {
 737                 p_tmp->i_refcount++;
 738                 return p_tmp;
 739             }
 740             else
 741             {
 742                 return FindObject( p_tmp, i_type, i_mode );
 743             }
 744         }
 745         break;
 746
 747     case FIND_CHILD:
 748         for( i = p_this->i_children; i--; )
 749         {
 750             p_tmp = p_this->pp_children[i];
 751             if( p_tmp->i_object_type == i_type )
 752             {
 753                 p_tmp->i_refcount++;
 754                 return p_tmp;
 755             }
 756             else if( p_tmp->i_children )
 757             {
 758                 p_tmp = FindObject( p_tmp, i_type, i_mode );
 759                 if( p_tmp )
 760                 {
 761                     return p_tmp;
 762                 }
 763             }
 764         }
 765         break;
 766
 767     case FIND_ANYWHERE:
 768         /* Handled in vlc_object_find */
 769         break;
 770     }
 771
 772     return NULL;
 773 }
 774
 775 static void DetachObject( vlc_object_t *p_this )
 776 {
 777     vlc_object_t *p_parent = p_this->p_parent;
 778     int i_index, i;
 779
 780     /* Remove p_this's parent */
 781     p_this->p_parent = NULL;
 782
 783     /* Remove all of p_parent's children which are p_this */
 784     for( i_index = p_parent->i_children ; i_index-- ; )
 785     {
 786         if( p_parent->pp_children[i_index] == p_this )
 787         {
 788             p_parent->i_children--;
 789             for( i = i_index ; i < p_parent->i_children ; i++ )
 790             {
 791                 p_parent->pp_children[i] = p_parent->pp_children[i+1];
 792             }
 793         }
 794     }
 795
 796     if( p_parent->i_children )
 797     {
 798         p_parent->pp_children = (vlc_object_t **)realloc( p_parent->pp_children,
 799                                p_parent->i_children * sizeof(vlc_object_t *) );
 800     }
 801     else
 802     {
 803         free( p_parent->pp_children );
 804         p_parent->pp_children = NULL;
 805     }
 806 }
 807
 808 /*****************************************************************************
 809  * SetAttachment: recursively set the b_attached flag of a subtree.
 810  *****************************************************************************
 811  * This function is used by the attach and detach functions to propagate
 812  * the b_attached flag in a subtree.
 813  *****************************************************************************/
 814 static void SetAttachment( vlc_object_t *p_this, vlc_bool_t b_attached )
 815 {
 816     int i_index;
 817
 818     for( i_index = p_this->i_children ; i_index-- ; )
 819     {
 820         SetAttachment( p_this->pp_children[i_index], b_attached );
 821     }
 822
 823     p_this->b_attached = b_attached;
 824 }
 825
 826 static void PrintObject( vlc_object_t *p_this, const char *psz_prefix )
 827 {
 828     char psz_children[20], psz_refcount[20], psz_thread[20], psz_name[50];
 829
 830     psz_name[0] = '\0';
 831     if( p_this->psz_object_name )
 832     {
 833         snprintf( psz_name, 50, " \"%s\"", p_this->psz_object_name );
 834         psz_name[48] = '\"';
 835         psz_name[49] = '\0';
 836     }
 837
 838     psz_children[0] = '\0';
 839     switch( p_this->i_children )
 840     {
 841         case 0:
 842             break;
 843         case 1:
 844             strcpy( psz_children, ", 1 child" );
 845             break;
 846         default:
 847             snprintf( psz_children, 20,
 848                       ", %i children", p_this->i_children );
 849             psz_children[19] = '\0';
 850             break;
 851     }
 852
 853     psz_refcount[0] = '\0';
 854     if( p_this->i_refcount )
 855     {
 856         snprintf( psz_refcount, 20, ", refcount %i", p_this->i_refcount );
 857         psz_refcount[19] = '\0';
 858     }
 859
 860     psz_thread[0] = '\0';
 861     if( p_this->b_thread )
 862     {
 863         snprintf( psz_thread, 20, " (thread %d)", (int)p_this->thread_id );
 864         psz_thread[19] = '\0';
 865     }
 866
 867     printf( " %so %.8i %s%s%s%s%s\n", psz_prefix,
 868             p_this->i_object_id, p_this->psz_object_type,
 869             psz_name, psz_thread, psz_refcount, psz_children );
 870 }
 871
 872 static void DumpStructure( vlc_object_t *p_this, int i_level, char *psz_foo )
 873 {
 874     int i;
 875     char i_back = psz_foo[i_level];
 876     psz_foo[i_level] = '\0';
 877
 878     PrintObject( p_this, psz_foo );
 879
 880     psz_foo[i_level] = i_back;
 881
 882     if( i_level / 2 >= MAX_DUMPSTRUCTURE_DEPTH )
 883     {
 884         msg_Warn( p_this, "structure tree is too deep" );
 885         return;
 886     }
 887
 888     for( i = 0 ; i < p_this->i_children ; i++ )
 889     {
 890         if( i_level )
 891         {
 892             psz_foo[i_level-1] = ' ';
 893
 894             if( psz_foo[i_level-2] == '`' )
 895             {
 896                 psz_foo[i_level-2] = ' ';
 897             }
 898         }
 899
 900         if( i == p_this->i_children - 1 )
 901         {
 902             psz_foo[i_level] = '`';
 903         }
 904         else
 905         {
 906             psz_foo[i_level] = '|';
 907         }
 908
 909         psz_foo[i_level+1] = '-';
 910         psz_foo[i_level+2] = '\0';
 911
 912         DumpStructure( p_this->pp_children[i], i_level + 2, psz_foo );
 913     }
 914 }
 915
 916 static vlc_list_t * NewList( int i_count )
 917 {
 918     vlc_list_t * p_list = (vlc_list_t *)malloc( sizeof( vlc_list_t ) );
 919     if( p_list == NULL )
 920     {
 921         return NULL;
 922     }
 923
 924     p_list->i_count = i_count;
 925
 926     if( i_count == 0 )
 927     {
 928         p_list->p_values = NULL;
 929         return p_list;
 930     }
 931
 932     p_list->p_values = malloc( i_count * sizeof( vlc_value_t ) );
 933     if( p_list->p_values == NULL )
 934     {
 935         p_list->i_count = 0;
 936         return p_list;
 937     }
 938
 939     return p_list;
 940 }
 941
 942 static void ListReplace( vlc_list_t *p_list, vlc_object_t *p_object,
 943                          int i_index )
 944 {
 945     if( p_list == NULL || i_index >= p_list->i_count )
 946     {
 947         return;
 948     }
 949
 950     p_object->i_refcount++;
 951
 952     p_list->p_values[i_index].p_object = p_object;
 953
 954     return;
 955 }
 956
 957 static void ListAppend( vlc_list_t *p_list, vlc_object_t *p_object )
 958 {
 959     if( p_list == NULL )
 960     {
 961         return;
 962     }
 963
 964     p_list->p_values = realloc( p_list->p_values, (p_list->i_count + 1)
 965                                 * sizeof( vlc_value_t ) );
 966     if( p_list->p_values == NULL )
 967     {
 968         p_list->i_count = 0;
 969         return;
 970     }
 971
 972     p_object->i_refcount++;
 973
 974     p_list->p_values[p_list->i_count].p_object = p_object;
 975     p_list->i_count++;
 976
 977     return;
 978 }
 979
 980 static int CountChildren( vlc_object_t *p_this, int i_type )
 981 {
 982     vlc_object_t *p_tmp;
 983     int i, i_count = 0;
 984
 985     for( i = 0; i < p_this->i_children; i++ )
 986     {
 987         p_tmp = p_this->pp_children[i];
 988
 989         if( p_tmp->i_object_type == i_type )
 990         {
 991             i_count++;
 992         }
 993
 994         if( p_tmp->i_children )
 995         {
 996             i_count += CountChildren( p_tmp, i_type );
 997         }
 998     }
 999
1000     return i_count;
1001 }
1002
1003 static void ListChildren( vlc_list_t *p_list, vlc_object_t *p_this, int i_type )
1004 {
1005     vlc_object_t *p_tmp;
1006     int i;
1007
1008     for( i = 0; i < p_this->i_children; i++ )
1009     {
1010         p_tmp = p_this->pp_children[i];
1011
1012         if( p_tmp->i_object_type == i_type )
1013         {
1014             ListReplace( p_list, p_tmp, p_list->i_count++ );
1015         }
1016
1017         if( p_tmp->i_children )
1018         {
1019             ListChildren( p_list, p_tmp, i_type );
1020         }
1021     }
1022 }