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

   1 /*****************************************************************************
   2  * objects.c: vlc_object_t handling
   3  *****************************************************************************
   4  * Copyright (C) 2004-2007 the VideoLAN team
   5  * $Id$
   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., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, 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 #include "../libvlc.h"
  36 #include <vlc_vout.h>
  37 #include <vlc_aout.h>
  38 #include "audio_output/aout_internal.h"
  39
  40 #include <vlc_access.h>
  41 #include <vlc_demux.h>
  42 #include <vlc_stream.h>
  43
  44 #include <vlc_sout.h>
  45 #include "stream_output/stream_output.h"
  46
  47 #include "vlc_playlist.h"
  48 #include "vlc_interface.h"
  49 #include "vlc_codec.h"
  50 #include "vlc_filter.h"
  51
  52 #include "vlc_httpd.h"
  53 #include "vlc_vlm.h"
  54 #include "input/vlm_internal.h"
  55 #include "vlc_vod.h"
  56 #include "vlc_tls.h"
  57 #include "vlc_xml.h"
  58 #include "vlc_osd.h"
  59 #include "vlc_meta.h"
  60
  61 #include "variables.h"
  62
  63 /*****************************************************************************
  64  * Local prototypes
  65  *****************************************************************************/
  66 static int  DumpCommand( vlc_object_t *, char const *,
  67                          vlc_value_t, vlc_value_t, void * );
  68
  69 static vlc_object_t * FindObject    ( vlc_object_t *, int, int );
  70 static vlc_object_t * FindObjectName( vlc_object_t *, const char *, int );
  71 static void           DetachObject  ( vlc_object_t * );
  72 static void           PrintObject   ( vlc_object_t *, const char * );
  73 static void           DumpStructure ( vlc_object_t *, int, char * );
  74 static int            FindIndex     ( vlc_object_t *, vlc_object_t **, int );
  75 static void           SetAttachment ( vlc_object_t *, vlc_bool_t );
  76
  77 static vlc_list_t   * NewList       ( int );
  78 static void           ListReplace   ( vlc_list_t *, vlc_object_t *, int );
  79 /*static void           ListAppend    ( vlc_list_t *, vlc_object_t * );*/
  80 static int            CountChildren ( vlc_object_t *, int );
  81 static void           ListChildren  ( vlc_list_t *, vlc_object_t *, int );
  82
  83 /*****************************************************************************
  84  * Local structure lock
  85  *****************************************************************************/
  86 static vlc_mutex_t    structure_lock;
  87 static vlc_object_internals_t global_internals;
  88
  89 vlc_object_t *vlc_custom_create( vlc_object_t *p_this, size_t i_size,
  90                                  int i_type, const char *psz_type )
  91 {
  92     vlc_object_t *p_new;
  93     vlc_object_internals_t *p_priv;
  94
  95     if( i_type == VLC_OBJECT_GLOBAL )
  96     {
  97         p_new = p_this;
  98         p_priv = &global_internals;
  99         memset( p_priv, 0, sizeof( *p_priv ) );
 100     }
 101     else
 102     {
 103         p_priv = calloc( 1, sizeof( *p_priv ) + i_size );
 104         if( p_priv == NULL )
 105             return NULL;
 106
 107         p_new = (vlc_object_t *)(p_priv + 1);
 108     }
 109
 110     p_new->p_internals = p_priv;
 111     p_new->i_object_type = i_type;
 112     p_new->psz_object_type = psz_type;
 113
 114     p_new->psz_object_name = NULL;
 115
 116     p_new->b_die = VLC_FALSE;
 117     p_new->b_error = VLC_FALSE;
 118     p_new->b_dead = VLC_FALSE;
 119     p_priv->b_attached = VLC_FALSE;
 120     p_new->b_force = VLC_FALSE;
 121
 122     p_new->psz_header = NULL;
 123
 124     if( p_this->i_flags & OBJECT_FLAGS_NODBG )
 125         p_new->i_flags |= OBJECT_FLAGS_NODBG;
 126     if( p_this->i_flags & OBJECT_FLAGS_QUIET )
 127         p_new->i_flags |= OBJECT_FLAGS_QUIET;
 128     if( p_this->i_flags & OBJECT_FLAGS_NOINTERACT )
 129         p_new->i_flags |= OBJECT_FLAGS_NOINTERACT;
 130
 131     p_priv->p_vars = calloc( sizeof( variable_t ), 16 );
 132
 133     if( !p_priv->p_vars )
 134     {
 135         if( i_type != VLC_OBJECT_GLOBAL )
 136             free( p_priv );
 137         return NULL;
 138     }
 139
 140     if( i_type == VLC_OBJECT_GLOBAL )
 141     {
 142         /* If i_type is global, then p_new is actually p_libvlc_global */
 143         libvlc_global_data_t *p_libvlc_global = (libvlc_global_data_t *)p_new;
 144         p_new->p_libvlc = NULL;
 145
 146         p_libvlc_global->i_counter = 0;
 147         p_new->i_object_id = 0;
 148
 149         p_libvlc_global->i_objects = 1;
 150         p_libvlc_global->pp_objects = malloc( sizeof(vlc_object_t *) );
 151         p_libvlc_global->pp_objects[0] = p_new;
 152         p_priv->b_attached = VLC_TRUE;
 153     }
 154     else
 155     {
 156         libvlc_global_data_t *p_libvlc_global = vlc_global();
 157         if( i_type == VLC_OBJECT_LIBVLC )
 158         {
 159             p_new->p_libvlc = (libvlc_int_t*)p_new;
 160             p_priv->b_attached = VLC_TRUE;
 161         }
 162         else
 163         {
 164             p_new->p_libvlc = p_this->p_libvlc;
 165         }
 166
 167         vlc_mutex_lock( &structure_lock );
 168
 169         p_libvlc_global->i_counter++;
 170         p_new->i_object_id = p_libvlc_global->i_counter;
 171
 172         /* Wooohaa! If *this* fails, we're in serious trouble! Anyway it's
 173          * useless to try and recover anything if pp_objects gets smashed. */
 174         TAB_APPEND( p_libvlc_global->i_objects, p_libvlc_global->pp_objects,
 175                     p_new );
 176
 177         vlc_mutex_unlock( &structure_lock );
 178     }
 179
 180     p_new->i_refcount = 0;
 181     p_new->p_parent = NULL;
 182     p_new->pp_children = NULL;
 183     p_new->i_children = 0;
 184
 185     p_new->p_private = NULL;
 186
 187     /* Initialize mutexes and condvars */
 188     vlc_mutex_init( p_new, &p_new->object_lock );
 189     vlc_cond_init( p_new, &p_new->object_wait );
 190     vlc_mutex_init( p_new, &p_priv->var_lock );
 191
 192     if( i_type == VLC_OBJECT_GLOBAL )
 193     {
 194         vlc_mutex_init( p_new, &structure_lock );
 195     }
 196
 197     if( i_type == VLC_OBJECT_LIBVLC )
 198     {
 199         var_Create( p_new, "list", VLC_VAR_STRING | VLC_VAR_ISCOMMAND );
 200         var_AddCallback( p_new, "list", DumpCommand, NULL );
 201         var_Create( p_new, "tree", VLC_VAR_STRING | VLC_VAR_ISCOMMAND );
 202         var_AddCallback( p_new, "tree", DumpCommand, NULL );
 203         var_Create( p_new, "vars", VLC_VAR_STRING | VLC_VAR_ISCOMMAND );
 204         var_AddCallback( p_new, "vars", DumpCommand, NULL );
 205     }
 206
 207     return p_new;
 208 }
 209
 210
 211 /**
 212  * Allocates and initializes a vlc object.
 213  *
 214  * @param i_type known object type (all of them are negative integer values),
 215  *               or object byte size (always positive).
 216  *
 217  * @return the new object, or NULL on error.
 218  */
 219 void * __vlc_object_create( vlc_object_t *p_this, int i_type )
 220 {
 221     const char   * psz_type;
 222     size_t         i_size;
 223
 224     switch( i_type )
 225     {
 226         case VLC_OBJECT_GLOBAL:
 227             i_size = sizeof(libvlc_global_data_t);
 228             psz_type = "global";
 229             break;
 230         case VLC_OBJECT_LIBVLC:
 231             i_size = sizeof(libvlc_int_t);
 232             psz_type = "libvlc";
 233             break;
 234         case VLC_OBJECT_INTF:
 235             i_size = sizeof(intf_thread_t);
 236             psz_type = "interface";
 237             break;
 238         case VLC_OBJECT_DIALOGS:
 239             i_size = sizeof(intf_thread_t);
 240             psz_type = "dialogs";
 241             break;
 242         case VLC_OBJECT_PLAYLIST:
 243             i_size = sizeof(playlist_t);
 244             psz_type = "playlist";
 245             break;
 246         case VLC_OBJECT_SD:
 247             i_size = sizeof(services_discovery_t);
 248             psz_type = "services discovery";
 249             break;
 250         case VLC_OBJECT_INPUT:
 251             i_size = sizeof(input_thread_t);
 252             psz_type = "input";
 253             break;
 254         case VLC_OBJECT_DEMUX:
 255             i_size = sizeof(demux_t);
 256             psz_type = "demux";
 257             break;
 258         case VLC_OBJECT_ACCESS:
 259             i_size = sizeof(access_t);
 260             psz_type = "access";
 261             break;
 262         case VLC_OBJECT_DECODER:
 263             i_size = sizeof(decoder_t);
 264             psz_type = "decoder";
 265             break;
 266         case VLC_OBJECT_PACKETIZER:
 267             i_size = sizeof(decoder_t);
 268             psz_type = "packetizer";
 269             break;
 270         case VLC_OBJECT_ENCODER:
 271             i_size = sizeof(encoder_t);
 272             psz_type = "encoder";
 273             break;
 274         case VLC_OBJECT_FILTER:
 275             i_size = sizeof(filter_t);
 276             psz_type = "filter";
 277             break;
 278         case VLC_OBJECT_VOUT:
 279             i_size = sizeof(vout_thread_t);
 280             psz_type = "video output";
 281             break;
 282         case VLC_OBJECT_SPU:
 283             i_size = sizeof(spu_t);
 284             psz_type = "subpicture";
 285             break;
 286         case VLC_OBJECT_AOUT:
 287             i_size = sizeof(aout_instance_t);
 288             psz_type = "audio output";
 289             break;
 290         case VLC_OBJECT_SOUT:
 291             i_size = sizeof(sout_instance_t);
 292             psz_type = "stream output";
 293             break;
 294         case VLC_OBJECT_VLM:
 295             i_size = sizeof( vlm_t );
 296             psz_type = "vlm dameon";
 297             break;
 298         case VLC_OBJECT_VOD:
 299             i_size = sizeof( vod_t );
 300             psz_type = "vod server";
 301             break;
 302         case VLC_OBJECT_TLS:
 303             i_size = sizeof( tls_t );
 304             psz_type = "tls";
 305             break;
 306         case VLC_OBJECT_XML:
 307             i_size = sizeof( xml_t );
 308             psz_type = "xml";
 309             break;
 310         case VLC_OBJECT_OPENGL:
 311             i_size = sizeof( vout_thread_t );
 312             psz_type = "opengl";
 313             break;
 314         case VLC_OBJECT_ANNOUNCE:
 315             i_size = sizeof( announce_handler_t );
 316             psz_type = "announce";
 317             break;
 318         case VLC_OBJECT_META_ENGINE:
 319             i_size = sizeof( meta_engine_t );
 320             psz_type = "meta engine";
 321             break;
 322         case VLC_OBJECT_OSDMENU:
 323             i_size = sizeof( osd_menu_t );
 324             psz_type = "osd menu";
 325             break;
 326         default:
 327             i_size = i_type > (int)sizeof(vlc_object_t)
 328                          ? i_type : (int)sizeof(vlc_object_t);
 329             i_type = VLC_OBJECT_GENERIC;
 330             psz_type = "generic";
 331             break;
 332     }
 333
 334     return vlc_custom_create( p_this, i_size, i_type, psz_type );
 335 }
 336
 337
 338 /**
 339  ****************************************************************************
 340  * Destroy a vlc object
 341  *
 342  * This function destroys an object that has been previously allocated with
 343  * vlc_object_create. The object's refcount must be zero and it must not be
 344  * attached to other objects in any way.
 345  *****************************************************************************/
 346 void __vlc_object_destroy( vlc_object_t *p_this )
 347 {
 348     vlc_object_internals_t *p_priv = vlc_internals( p_this );
 349     int i_delay = 0;
 350
 351     if( p_this->i_children )
 352     {
 353         msg_Err( p_this, "cannot delete object (%i, %s) with children" ,
 354                  p_this->i_object_id, p_this->psz_object_name );
 355         return;
 356     }
 357
 358     if( p_this->p_parent )
 359     {
 360         msg_Err( p_this, "cannot delete object (%i, %s) with a parent",
 361                  p_this->i_object_id, p_this->psz_object_name );
 362         return;
 363     }
 364
 365     while( p_this->i_refcount )
 366     {
 367         i_delay++;
 368
 369         /* Don't warn immediately ... 100ms seems OK */
 370         if( i_delay == 2 )
 371         {
 372             msg_Warn( p_this,
 373                   "refcount is %i, delaying before deletion (id=%d,type=%d)",
 374                   p_this->i_refcount, p_this->i_object_id,
 375                   p_this->i_object_type );
 376         }
 377         else if( i_delay == 10 )
 378         {
 379             msg_Err( p_this,
 380                   "refcount is %i, delaying again (id=%d,type=%d)",
 381                   p_this->i_refcount, p_this->i_object_id,
 382                   p_this->i_object_type );
 383         }
 384         else if( i_delay == 20 )
 385         {
 386             msg_Err( p_this,
 387                   "waited too long, cancelling destruction (id=%d,type=%d)",
 388                   p_this->i_object_id, p_this->i_object_type );
 389             return;
 390         }
 391
 392         msleep( 100000 );
 393     }
 394
 395     /* Destroy the associated variables, starting from the end so that
 396      * no memmove calls have to be done. */
 397     while( p_priv->i_vars )
 398     {
 399         var_Destroy( p_this, p_priv->p_vars[p_priv->i_vars - 1].psz_name );
 400     }
 401
 402     free( p_priv->p_vars );
 403     vlc_mutex_destroy( &p_priv->var_lock );
 404
 405     if( p_this->psz_header ) free( p_this->psz_header );
 406
 407     if( p_this->i_object_type == VLC_OBJECT_GLOBAL )
 408     {
 409         libvlc_global_data_t *p_global = (libvlc_global_data_t *)p_this;
 410         /* We are the global object ... no need to lock. */
 411         free( p_global->pp_objects );
 412         p_global->pp_objects = NULL;
 413         p_global->i_objects--;
 414
 415         vlc_mutex_destroy( &structure_lock );
 416     }
 417     else
 418     {
 419         libvlc_global_data_t *p_libvlc_global = vlc_global();
 420         int i_index;
 421
 422         vlc_mutex_lock( &structure_lock );
 423
 424         /* Wooohaa! If *this* fails, we're in serious trouble! Anyway it's
 425          * useless to try and recover anything if pp_objects gets smashed. */
 426         i_index = FindIndex( p_this, p_libvlc_global->pp_objects,
 427                              p_libvlc_global->i_objects );
 428         REMOVE_ELEM( p_libvlc_global->pp_objects,
 429                      p_libvlc_global->i_objects, i_index );
 430
 431         vlc_mutex_unlock( &structure_lock );
 432     }
 433
 434 #if defined(WIN32) || defined(UNDER_CE)
 435     /* if object has an associated thread, close it now */
 436     if( p_priv->thread_id.hThread )
 437        CloseHandle(p_priv->thread_id.hThread);
 438 #endif
 439
 440     vlc_mutex_destroy( &p_this->object_lock );
 441     vlc_cond_destroy( &p_this->object_wait );
 442
 443     /* global is not dynamically allocated by vlc_object_create */
 444     if( p_this->i_object_type != VLC_OBJECT_GLOBAL )
 445         free( p_priv );
 446 }
 447
 448
 449 /** Inter-object signaling */
 450
 451 void __vlc_object_lock( vlc_object_t *obj )
 452 {
 453     vlc_mutex_lock( &obj->object_lock );
 454 }
 455
 456 void __vlc_object_unlock( vlc_object_t *obj )
 457 {
 458     vlc_assert_locked( &p_this->object_lock );
 459     vlc_mutex_unlock( &obj->object_lock );
 460 }
 461
 462 /**
 463  * Waits for the object to be signaled (using vlc_object_signal()).
 464  * If the object already has a signal pending, this function will return
 465  * immediately. It is asserted that the caller holds the object lock.
 466  *
 467  * @return true if the object is dying and should terminate.
 468  */
 469 vlc_bool_t __vlc_object_wait( vlc_object_t *obj )
 470 {
 471     vlc_assert_locked( &obj->object_lock );
 472     vlc_cond_wait( &obj->object_wait, &obj->object_lock );
 473     return obj->b_die;
 474 }
 475
 476
 477 /**
 478  * Waits for the object to be signaled (using vlc_object_signal()), or for
 479  * a timer to expire.
 480  * If the object already has a signal pending, this function will return
 481  * immediately. It is asserted that the caller holds the object lock.
 482  *
 483  * @return negative if the object is dying and should terminate,
 484  * positive if the the object has been signaled but is not dying,
 485  * 0 if timeout has been reached.
 486  */
 487 int __vlc_object_timedwait( vlc_object_t *obj, mtime_t deadline )
 488 {
 489     int v;
 490
 491     vlc_assert_locked( &obj->object_lock );
 492     v = vlc_cond_timedwait( &obj->object_wait, &obj->object_lock, deadline );
 493     if( v == 0 ) /* signaled */
 494         return obj->b_die ? -1 : 1;
 495     return 0;
 496 }
 497
 498
 499 /**
 500  * Signals an object for which the lock is held.
 501  */
 502 void __vlc_object_signal_unlocked( vlc_object_t *obj )
 503 {
 504     vlc_assert_locked( &obj->object_lock );
 505     vlc_cond_signal( &obj->object_wait );
 506 }
 507
 508
 509 /**
 510  * Signals an object for which the lock is NOT held.
 511  */
 512 void __vlc_object_signal( vlc_object_t *obj )
 513 {
 514     vlc_mutex_lock( &obj->object_lock );
 515     vlc_object_signal_unlocked( obj );
 516     vlc_mutex_unlock( &obj->object_lock );
 517 }
 518
 519
 520 /**
 521  * Requests termination of an object.
 522  * If the object is LibVLC, also request to terminate all its children.
 523  */
 524 void __vlc_object_kill( vlc_object_t *p_this )
 525 {
 526     vlc_mutex_lock( &p_this->object_lock );
 527
 528     if( p_this->i_object_type == VLC_OBJECT_LIBVLC )
 529         for( int i = 0; i < p_this->i_children ; i++ )
 530             vlc_object_kill( p_this->pp_children[i] );
 531
 532     p_this->b_die = VLC_TRUE;
 533     vlc_object_signal_unlocked( p_this );
 534     vlc_mutex_unlock( &p_this->object_lock );
 535 }
 536
 537
 538 /**
 539  * find an object given its ID
 540  *
 541  * This function looks for the object whose i_object_id field is i_id. We
 542  * use a dichotomy so that lookups are in log2(n).
 543  *****************************************************************************/
 544 void * __vlc_object_get( vlc_object_t *p_this, int i_id )
 545 {
 546     int i_max, i_middle;
 547     vlc_object_t **pp_objects;
 548     libvlc_global_data_t *p_libvlc_global = vlc_global();
 549
 550     vlc_mutex_lock( &structure_lock );
 551
 552     pp_objects = p_libvlc_global->pp_objects;
 553
 554     /* Perform our dichotomy */
 555     for( i_max = p_libvlc_global->i_objects - 1 ; ; )
 556     {
 557         i_middle = i_max / 2;
 558
 559         if( pp_objects[i_middle]->i_object_id > i_id )
 560         {
 561             i_max = i_middle;
 562         }
 563         else if( pp_objects[i_middle]->i_object_id < i_id )
 564         {
 565             if( i_middle )
 566             {
 567                 pp_objects += i_middle;
 568                 i_max -= i_middle;
 569             }
 570             else
 571             {
 572                 /* This happens when there are only two remaining objects */
 573                 if( pp_objects[i_middle+1]->i_object_id == i_id )
 574                 {
 575                     vlc_mutex_unlock( &structure_lock );
 576                     pp_objects[i_middle+1]->i_refcount++;
 577                     return pp_objects[i_middle+1];
 578                 }
 579                 break;
 580             }
 581         }
 582         else
 583         {
 584             vlc_mutex_unlock( &structure_lock );
 585             pp_objects[i_middle]->i_refcount++;
 586             return pp_objects[i_middle];
 587         }
 588
 589         if( i_max == 0 )
 590         {
 591             /* this means that i_max == i_middle, and since we have already
 592              * tested pp_objects[i_middle]), p_found is properly set. */
 593             break;
 594         }
 595     }
 596
 597     vlc_mutex_unlock( &structure_lock );
 598     return NULL;
 599 }
 600
 601 /**
 602  ****************************************************************************
 603  * find a typed object and increment its refcount
 604  *****************************************************************************
 605  * This function recursively looks for a given object type. i_mode can be one
 606  * of FIND_PARENT, FIND_CHILD or FIND_ANYWHERE.
 607  *****************************************************************************/
 608 void * __vlc_object_find( vlc_object_t *p_this, int i_type, int i_mode )
 609 {
 610     vlc_object_t *p_found;
 611
 612     vlc_mutex_lock( &structure_lock );
 613
 614     /* If we are of the requested type ourselves, don't look further */
 615     if( !(i_mode & FIND_STRICT) && p_this->i_object_type == i_type )
 616     {
 617         p_this->i_refcount++;
 618         vlc_mutex_unlock( &structure_lock );
 619         return p_this;
 620     }
 621
 622     /* Otherwise, recursively look for the object */
 623     if( (i_mode & 0x000f) == FIND_ANYWHERE )
 624     {
 625         vlc_object_t *p_root = p_this;
 626
 627         /* Find the root */
 628         while( p_root->p_parent != NULL &&
 629                p_root != VLC_OBJECT( p_this->p_libvlc ) )
 630         {
 631             p_root = p_root->p_parent;
 632         }
 633
 634         p_found = FindObject( p_root, i_type, (i_mode & ~0x000f)|FIND_CHILD );
 635         if( p_found == NULL && p_root != VLC_OBJECT( p_this->p_libvlc ) )
 636         {
 637             p_found = FindObject( VLC_OBJECT( p_this->p_libvlc ),
 638                                   i_type, (i_mode & ~0x000f)|FIND_CHILD );
 639         }
 640     }
 641     else
 642     {
 643         p_found = FindObject( p_this, i_type, i_mode );
 644     }
 645
 646     vlc_mutex_unlock( &structure_lock );
 647
 648     return p_found;
 649 }
 650
 651 /**
 652  ****************************************************************************
 653  * find a named object and increment its refcount
 654  *****************************************************************************
 655  * This function recursively looks for a given object name. i_mode can be one
 656  * of FIND_PARENT, FIND_CHILD or FIND_ANYWHERE.
 657  *****************************************************************************/
 658 void * __vlc_object_find_name( vlc_object_t *p_this, const char *psz_name,
 659                                int i_mode )
 660 {
 661     vlc_object_t *p_found;
 662
 663     vlc_mutex_lock( &structure_lock );
 664
 665     /* If have the requested name ourselves, don't look further */
 666     if( !(i_mode & FIND_STRICT)
 667         && p_this->psz_object_name
 668         && !strcmp( p_this->psz_object_name, psz_name ) )
 669     {
 670         p_this->i_refcount++;
 671         vlc_mutex_unlock( &structure_lock );
 672         return p_this;
 673     }
 674
 675     /* Otherwise, recursively look for the object */
 676     if( (i_mode & 0x000f) == FIND_ANYWHERE )
 677     {
 678         vlc_object_t *p_root = p_this;
 679
 680         /* Find the root */
 681         while( p_root->p_parent != NULL &&
 682                p_root != VLC_OBJECT( p_this->p_libvlc ) )
 683         {
 684             p_root = p_root->p_parent;
 685         }
 686
 687         p_found = FindObjectName( p_root, psz_name,
 688                                  (i_mode & ~0x000f)|FIND_CHILD );
 689         if( p_found == NULL && p_root != VLC_OBJECT( p_this->p_libvlc ) )
 690         {
 691             p_found = FindObjectName( VLC_OBJECT( p_this->p_libvlc ),
 692                                       psz_name, (i_mode & ~0x000f)|FIND_CHILD );
 693         }
 694     }
 695     else
 696     {
 697         p_found = FindObjectName( p_this, psz_name, i_mode );
 698     }
 699
 700     vlc_mutex_unlock( &structure_lock );
 701
 702     return p_found;
 703 }
 704
 705 /**
 706  ****************************************************************************
 707  * increment an object refcount
 708  *****************************************************************************/
 709 void __vlc_object_yield( vlc_object_t *p_this )
 710 {
 711     vlc_mutex_lock( &structure_lock );
 712     p_this->i_refcount++;
 713     vlc_mutex_unlock( &structure_lock );
 714 }
 715
 716 /**
 717  ****************************************************************************
 718  * decrement an object refcount
 719  *****************************************************************************/
 720 void __vlc_object_release( vlc_object_t *p_this )
 721 {
 722     vlc_mutex_lock( &structure_lock );
 723     p_this->i_refcount--;
 724     vlc_mutex_unlock( &structure_lock );
 725 }
 726
 727 /**
 728  ****************************************************************************
 729  * attach object to a parent object
 730  *****************************************************************************
 731  * This function sets p_this as a child of p_parent, and p_parent as a parent
 732  * of p_this. This link can be undone using vlc_object_detach.
 733  *****************************************************************************/
 734 void __vlc_object_attach( vlc_object_t *p_this, vlc_object_t *p_parent )
 735 {
 736     if( !p_this ) return;
 737
 738     vlc_mutex_lock( &structure_lock );
 739
 740     /* Attach the parent to its child */
 741     p_this->p_parent = p_parent;
 742
 743     /* Attach the child to its parent */
 744     INSERT_ELEM( p_parent->pp_children, p_parent->i_children,
 745                  p_parent->i_children, p_this );
 746
 747     /* Climb up the tree to see whether we are connected with the root */
 748     if( p_parent->p_internals->b_attached )
 749     {
 750         SetAttachment( p_this, VLC_TRUE );
 751     }
 752
 753     vlc_mutex_unlock( &structure_lock );
 754 }
 755
 756 /**
 757  ****************************************************************************
 758  * detach object from its parent
 759  *****************************************************************************
 760  * This function removes all links between an object and its parent.
 761  *****************************************************************************/
 762 void __vlc_object_detach( vlc_object_t *p_this )
 763 {
 764     if( !p_this ) return;
 765
 766     vlc_mutex_lock( &structure_lock );
 767     if( !p_this->p_parent )
 768     {
 769         msg_Err( p_this, "object is not attached" );
 770         vlc_mutex_unlock( &structure_lock );
 771         return;
 772     }
 773
 774     /* Climb up the tree to see whether we are connected with the root */
 775     if( p_this->p_parent->p_internals->b_attached )
 776     {
 777         SetAttachment( p_this, VLC_FALSE );
 778     }
 779
 780     DetachObject( p_this );
 781     vlc_mutex_unlock( &structure_lock );
 782     p_this = NULL;
 783 }
 784
 785 /**
 786  ****************************************************************************
 787  * find a list typed objects and increment their refcount
 788  *****************************************************************************
 789  * This function recursively looks for a given object type. i_mode can be one
 790  * of FIND_PARENT, FIND_CHILD or FIND_ANYWHERE.
 791  *****************************************************************************/
 792 vlc_list_t * __vlc_list_find( vlc_object_t *p_this, int i_type, int i_mode )
 793 {
 794     vlc_list_t *p_list;
 795     vlc_object_t **pp_current, **pp_end;
 796     int i_count = 0, i_index = 0;
 797     libvlc_global_data_t *p_libvlc_global = vlc_global();
 798
 799     vlc_mutex_lock( &structure_lock );
 800
 801     /* Look for the objects */
 802     switch( i_mode & 0x000f )
 803     {
 804     case FIND_ANYWHERE:
 805         pp_current = p_libvlc_global->pp_objects;
 806         pp_end = pp_current + p_libvlc_global->i_objects;
 807
 808         for( ; pp_current < pp_end ; pp_current++ )
 809         {
 810             if( (*pp_current)->p_internals->b_attached
 811                  && (*pp_current)->i_object_type == i_type )
 812             {
 813                 i_count++;
 814             }
 815         }
 816
 817         p_list = NewList( i_count );
 818         pp_current = p_libvlc_global->pp_objects;
 819
 820         for( ; pp_current < pp_end ; pp_current++ )
 821         {
 822             if( (*pp_current)->p_internals->b_attached
 823                  && (*pp_current)->i_object_type == i_type )
 824             {
 825                 ListReplace( p_list, *pp_current, i_index );
 826                 if( i_index < i_count ) i_index++;
 827             }
 828         }
 829     break;
 830
 831     case FIND_CHILD:
 832         i_count = CountChildren( p_this, i_type );
 833         p_list = NewList( i_count );
 834
 835         /* Check allocation was successful */
 836         if( p_list->i_count != i_count )
 837         {
 838             msg_Err( p_this, "list allocation failed!" );
 839             p_list->i_count = 0;
 840             break;
 841         }
 842
 843         p_list->i_count = 0;
 844         ListChildren( p_list, p_this, i_type );
 845         break;
 846
 847     default:
 848         msg_Err( p_this, "unimplemented!" );
 849         p_list = NewList( 0 );
 850         break;
 851     }
 852
 853     vlc_mutex_unlock( &structure_lock );
 854
 855     return p_list;
 856 }
 857
 858 /*****************************************************************************
 859  * DumpCommand: print the current vlc structure
 860  *****************************************************************************
 861  * This function prints either an ASCII tree showing the connections between
 862  * vlc objects, and additional information such as their refcount, thread ID,
 863  * etc. (command "tree"), or the same data as a simple list (command "list").
 864  *****************************************************************************/
 865 static int DumpCommand( vlc_object_t *p_this, char const *psz_cmd,
 866                         vlc_value_t oldval, vlc_value_t newval, void *p_data )
 867 {
 868     libvlc_global_data_t *p_libvlc_global = vlc_global();
 869
 870     (void)oldval; (void)p_data;
 871     if( *psz_cmd == 'l' )
 872     {
 873         vlc_mutex_lock( &structure_lock );
 874
 875         vlc_object_t **pp_current, **pp_end;
 876
 877         pp_current = p_libvlc_global->pp_objects;
 878         pp_end = pp_current + p_libvlc_global->i_objects;
 879
 880         for( ; pp_current < pp_end ; pp_current++ )
 881         {
 882             if( (*pp_current)->p_internals->b_attached )
 883             {
 884                 PrintObject( *pp_current, "" );
 885             }
 886             else
 887             {
 888                 printf( " o %.8i %s (not attached)\n",
 889                         (*pp_current)->i_object_id,
 890                         (*pp_current)->psz_object_type );
 891             }
 892         }
 893
 894         vlc_mutex_unlock( &structure_lock );
 895     }
 896     else
 897     {
 898         vlc_object_t *p_object = NULL;
 899
 900         if( *newval.psz_string )
 901         {
 902             char *end;
 903             int i_id = strtol( newval.psz_string, &end, 0 );
 904             if( end != newval.psz_string )
 905                 p_object = vlc_object_get( p_this, i_id );
 906             else
 907             {
 908                 /* try using the object's name to find it */
 909                 vlc_object_t *p_libvlc = vlc_object_get( p_this, 1 );
 910                 if( p_libvlc )
 911                 {
 912                     /* Look in p_libvlc's children tree */
 913                     p_object = vlc_object_find_name( p_libvlc,
 914                                                      newval.psz_string,
 915                                                      FIND_CHILD );
 916                     vlc_object_release( p_libvlc );
 917                 }
 918                 if( !p_object )
 919                 {
 920                     /* If it's not in libvlc, look in libvlc_global (== p_this) */
 921                     p_object = vlc_object_find_name( p_this,
 922                                                      newval.psz_string,
 923                                                      FIND_CHILD );
 924                 }
 925             }
 926
 927             if( !p_object )
 928             {
 929                 return VLC_ENOOBJ;
 930             }
 931         }
 932
 933         vlc_mutex_lock( &structure_lock );
 934
 935         if( *psz_cmd == 't' )
 936         {
 937             char psz_foo[2 * MAX_DUMPSTRUCTURE_DEPTH + 1];
 938
 939             if( !p_object )
 940                 p_object = p_this->p_libvlc ? VLC_OBJECT(p_this->p_libvlc) : p_this;
 941
 942             psz_foo[0] = '|';
 943             DumpStructure( p_object, 0, psz_foo );
 944         }
 945         else if( *psz_cmd == 'v' )
 946         {
 947             int i;
 948
 949             if( !p_object )
 950                 p_object = p_this->p_libvlc ? VLC_OBJECT(p_this->p_libvlc) : p_this;
 951
 952             PrintObject( p_object, "" );
 953
 954             if( !p_object->p_internals->i_vars )
 955                 printf( " `-o No variables\n" );
 956             for( i = 0; i < p_object->p_internals->i_vars; i++ )
 957             {
 958                 variable_t *p_var = p_object->p_internals->p_vars + i;
 959
 960                 const char *psz_type = "unknown";
 961                 switch( p_var->i_type & VLC_VAR_TYPE )
 962                 {
 963 #define MYCASE( type, nice )                \
 964                     case VLC_VAR_ ## type:  \
 965                         psz_type = nice;    \
 966                         break;
 967                     MYCASE( VOID, "void" );
 968                     MYCASE( BOOL, "bool" );
 969                     MYCASE( INTEGER, "integer" );
 970                     MYCASE( HOTKEY, "hotkey" );
 971                     MYCASE( STRING, "string" );
 972                     MYCASE( MODULE, "module" );
 973                     MYCASE( FILE, "file" );
 974                     MYCASE( DIRECTORY, "directory" );
 975                     MYCASE( VARIABLE, "variable" );
 976                     MYCASE( FLOAT, "float" );
 977                     MYCASE( TIME, "time" );
 978                     MYCASE( ADDRESS, "address" );
 979                     MYCASE( MUTEX, "mutex" );
 980                     MYCASE( LIST, "list" );
 981 #undef MYCASE
 982                 }
 983                 printf( " %c-o \"%s\" (%s",
 984                         i + 1 == p_object->p_internals->i_vars ? '`' : '|',
 985                         p_var->psz_name, psz_type );
 986                 if( p_var->psz_text )
 987                     printf( ", %s", p_var->psz_text );
 988                 printf( ")" );
 989                 if( p_var->i_type & VLC_VAR_ISCOMMAND )
 990                     printf( ", command" );
 991                 if( p_var->i_entries )
 992                     printf( ", %d callbacks", p_var->i_entries );
 993                 switch( p_var->i_type & 0x00f0 )
 994                 {
 995                     case VLC_VAR_VOID:
 996                     case VLC_VAR_MUTEX:
 997                         break;
 998                     case VLC_VAR_BOOL:
 999                         printf( ": %s", p_var->val.b_bool ? "true" : "false" );
1000                         break;
1001                     case VLC_VAR_INTEGER:
1002                         printf( ": %d", p_var->val.i_int );
1003                         break;
1004                     case VLC_VAR_STRING:
1005                         printf( ": \"%s\"", p_var->val.psz_string );
1006                         break;
1007                     case VLC_VAR_FLOAT:
1008                         printf( ": %f", p_var->val.f_float );
1009                         break;
1010                     case VLC_VAR_TIME:
1011                         printf( ": " I64Fi, (int64_t)p_var->val.i_time );
1012                         break;
1013                     case VLC_VAR_ADDRESS:
1014                         printf( ": %p", p_var->val.p_address );
1015                         break;
1016                     case VLC_VAR_LIST:
1017                         printf( ": TODO" );
1018                         break;
1019                 }
1020                 printf( "\n" );
1021             }
1022         }
1023
1024         vlc_mutex_unlock( &structure_lock );
1025
1026         if( *newval.psz_string )
1027         {
1028             vlc_object_release( p_object );
1029         }
1030     }
1031
1032     return VLC_SUCCESS;
1033 }
1034
1035 /*****************************************************************************
1036  * vlc_list_release: free a list previously allocated by vlc_list_find
1037  *****************************************************************************
1038  * This function decreases the refcount of all objects in the list and
1039  * frees the list.
1040  *****************************************************************************/
1041 void vlc_list_release( vlc_list_t *p_list )
1042 {
1043     int i_index;
1044
1045     vlc_mutex_lock( &structure_lock );
1046     for( i_index = 0; i_index < p_list->i_count; i_index++ )
1047     {
1048         p_list->p_values[i_index].p_object->i_refcount--;
1049     }
1050     vlc_mutex_unlock( &structure_lock );
1051
1052     free( p_list->p_values );
1053     free( p_list );
1054 }
1055
1056 /* Following functions are local */
1057
1058 /*****************************************************************************
1059  * FindIndex: find the index of an object in an array of objects
1060  *****************************************************************************
1061  * This function assumes that p_this can be found in pp_objects. It will not
1062  * crash if p_this cannot be found, but will return a wrong value. It is your
1063  * duty to check the return value if you are not certain that the object could
1064  * be found for sure.
1065  *****************************************************************************/
1066 static int FindIndex( vlc_object_t *p_this,
1067                       vlc_object_t **pp_objects, int i_count )
1068 {
1069     int i_middle = i_count / 2;
1070
1071     if( i_count == 0 )
1072     {
1073         return 0;
1074     }
1075
1076     if( pp_objects[i_middle] == p_this )
1077     {
1078         return i_middle;
1079     }
1080
1081     if( i_count == 1 )
1082     {
1083         return 0;
1084     }
1085
1086     /* We take advantage of the sorted array */
1087     if( pp_objects[i_middle]->i_object_id < p_this->i_object_id )
1088     {
1089         return i_middle + FindIndex( p_this, pp_objects + i_middle,
1090                                              i_count - i_middle );
1091     }
1092     else
1093     {
1094         return FindIndex( p_this, pp_objects, i_middle );
1095     }
1096 }
1097
1098 static vlc_object_t * FindObject( vlc_object_t *p_this, int i_type, int i_mode )
1099 {
1100     int i;
1101     vlc_object_t *p_tmp;
1102
1103     switch( i_mode & 0x000f )
1104     {
1105     case FIND_PARENT:
1106         p_tmp = p_this->p_parent;
1107         if( p_tmp )
1108         {
1109             if( p_tmp->i_object_type == i_type )
1110             {
1111                 p_tmp->i_refcount++;
1112                 return p_tmp;
1113             }
1114             else
1115             {
1116                 return FindObject( p_tmp, i_type, i_mode );
1117             }
1118         }
1119         break;
1120
1121     case FIND_CHILD:
1122         for( i = p_this->i_children; i--; )
1123         {
1124             p_tmp = p_this->pp_children[i];
1125             if( p_tmp->i_object_type == i_type )
1126             {
1127                 p_tmp->i_refcount++;
1128                 return p_tmp;
1129             }
1130             else if( p_tmp->i_children )
1131             {
1132                 p_tmp = FindObject( p_tmp, i_type, i_mode );
1133                 if( p_tmp )
1134                 {
1135                     return p_tmp;
1136                 }
1137             }
1138         }
1139         break;
1140
1141     case FIND_ANYWHERE:
1142         /* Handled in vlc_object_find */
1143         break;
1144     }
1145
1146     return NULL;
1147 }
1148
1149 static vlc_object_t * FindObjectName( vlc_object_t *p_this,
1150                                       const char *psz_name,
1151                                       int i_mode )
1152 {
1153     int i;
1154     vlc_object_t *p_tmp;
1155
1156     switch( i_mode & 0x000f )
1157     {
1158     case FIND_PARENT:
1159         p_tmp = p_this->p_parent;
1160         if( p_tmp )
1161         {
1162             if( p_tmp->psz_object_name
1163                 && !strcmp( p_tmp->psz_object_name, psz_name ) )
1164             {
1165                 p_tmp->i_refcount++;
1166                 return p_tmp;
1167             }
1168             else
1169             {
1170                 return FindObjectName( p_tmp, psz_name, i_mode );
1171             }
1172         }
1173         break;
1174
1175     case FIND_CHILD:
1176         for( i = p_this->i_children; i--; )
1177         {
1178             p_tmp = p_this->pp_children[i];
1179             if( p_tmp->psz_object_name
1180                 && !strcmp( p_tmp->psz_object_name, psz_name ) )
1181             {
1182                 p_tmp->i_refcount++;
1183                 return p_tmp;
1184             }
1185             else if( p_tmp->i_children )
1186             {
1187                 p_tmp = FindObjectName( p_tmp, psz_name, i_mode );
1188                 if( p_tmp )
1189                 {
1190                     return p_tmp;
1191                 }
1192             }
1193         }
1194         break;
1195
1196     case FIND_ANYWHERE:
1197         /* Handled in vlc_object_find */
1198         break;
1199     }
1200
1201     return NULL;
1202 }
1203
1204 static void DetachObject( vlc_object_t *p_this )
1205 {
1206     vlc_object_t *p_parent = p_this->p_parent;
1207     int i_index, i;
1208
1209     /* Remove p_this's parent */
1210     p_this->p_parent = NULL;
1211
1212     /* Remove all of p_parent's children which are p_this */
1213     for( i_index = p_parent->i_children ; i_index-- ; )
1214     {
1215         if( p_parent->pp_children[i_index] == p_this )
1216         {
1217             p_parent->i_children--;
1218             for( i = i_index ; i < p_parent->i_children ; i++ )
1219             {
1220                 p_parent->pp_children[i] = p_parent->pp_children[i+1];
1221             }
1222         }
1223     }
1224
1225     if( p_parent->i_children )
1226     {
1227         p_parent->pp_children = (vlc_object_t **)realloc( p_parent->pp_children,
1228                                p_parent->i_children * sizeof(vlc_object_t *) );
1229     }
1230     else
1231     {
1232         free( p_parent->pp_children );
1233         p_parent->pp_children = NULL;
1234     }
1235 }
1236
1237 /*****************************************************************************
1238  * SetAttachment: recursively set the b_attached flag of a subtree.
1239  *****************************************************************************
1240  * This function is used by the attach and detach functions to propagate
1241  * the b_attached flag in a subtree.
1242  *****************************************************************************/
1243 static void SetAttachment( vlc_object_t *p_this, vlc_bool_t b_attached )
1244 {
1245     int i_index;
1246
1247     for( i_index = p_this->i_children ; i_index-- ; )
1248     {
1249         SetAttachment( p_this->pp_children[i_index], b_attached );
1250     }
1251
1252     p_this->p_internals->b_attached = b_attached;
1253 }
1254
1255 static void PrintObject( vlc_object_t *p_this, const char *psz_prefix )
1256 {
1257     char psz_children[20], psz_refcount[20], psz_thread[30], psz_name[50],
1258          psz_parent[20];
1259
1260     psz_name[0] = '\0';
1261     if( p_this->psz_object_name )
1262     {
1263         snprintf( psz_name, 49, " \"%s\"", p_this->psz_object_name );
1264         if( psz_name[48] )
1265             psz_name[48] = '\"';
1266     }
1267
1268     psz_children[0] = '\0';
1269     switch( p_this->i_children )
1270     {
1271         case 0:
1272             break;
1273         case 1:
1274             strcpy( psz_children, ", 1 child" );
1275             break;
1276         default:
1277             snprintf( psz_children, 19, ", %i children", p_this->i_children );
1278             break;
1279     }
1280
1281     psz_refcount[0] = '\0';
1282     if( p_this->i_refcount )
1283         snprintf( psz_refcount, 19, ", refcount %i", p_this->i_refcount );
1284
1285     psz_thread[0] = '\0';
1286     if( p_this->p_internals->b_thread )
1287         snprintf( psz_thread, 29, " (thread %u)",
1288 #if defined(WIN32) || defined(UNDER_CE)
1289                   (unsigned)p_this->p_internals->thread_id.id );
1290 #else
1291                   (unsigned)p_this->p_internals->thread_id );
1292 #endif
1293
1294     psz_parent[0] = '\0';
1295     if( p_this->p_parent )
1296         snprintf( psz_parent, 19, ", parent %i", p_this->p_parent->i_object_id );
1297
1298     printf( " %so %.8i %s%s%s%s%s%s\n", psz_prefix,
1299             p_this->i_object_id, p_this->psz_object_type,
1300             psz_name, psz_thread, psz_refcount, psz_children,
1301             psz_parent );
1302 }
1303
1304 static void DumpStructure( vlc_object_t *p_this, int i_level, char *psz_foo )
1305 {
1306     int i;
1307     char i_back = psz_foo[i_level];
1308     psz_foo[i_level] = '\0';
1309
1310     PrintObject( p_this, psz_foo );
1311
1312     psz_foo[i_level] = i_back;
1313
1314     if( i_level / 2 >= MAX_DUMPSTRUCTURE_DEPTH )
1315     {
1316         msg_Warn( p_this, "structure tree is too deep" );
1317         return;
1318     }
1319
1320     for( i = 0 ; i < p_this->i_children ; i++ )
1321     {
1322         if( i_level )
1323         {
1324             psz_foo[i_level-1] = ' ';
1325
1326             if( psz_foo[i_level-2] == '`' )
1327             {
1328                 psz_foo[i_level-2] = ' ';
1329             }
1330         }
1331
1332         if( i == p_this->i_children - 1 )
1333         {
1334             psz_foo[i_level] = '`';
1335         }
1336         else
1337         {
1338             psz_foo[i_level] = '|';
1339         }
1340
1341         psz_foo[i_level+1] = '-';
1342         psz_foo[i_level+2] = '\0';
1343
1344         DumpStructure( p_this->pp_children[i], i_level + 2, psz_foo );
1345     }
1346 }
1347
1348 static vlc_list_t * NewList( int i_count )
1349 {
1350     vlc_list_t * p_list = (vlc_list_t *)malloc( sizeof( vlc_list_t ) );
1351     if( p_list == NULL )
1352     {
1353         return NULL;
1354     }
1355
1356     p_list->i_count = i_count;
1357
1358     if( i_count == 0 )
1359     {
1360         p_list->p_values = NULL;
1361         return p_list;
1362     }
1363
1364     p_list->p_values = malloc( i_count * sizeof( vlc_value_t ) );
1365     if( p_list->p_values == NULL )
1366     {
1367         p_list->i_count = 0;
1368         return p_list;
1369     }
1370
1371     return p_list;
1372 }
1373
1374 static void ListReplace( vlc_list_t *p_list, vlc_object_t *p_object,
1375                          int i_index )
1376 {
1377     if( p_list == NULL || i_index >= p_list->i_count )
1378     {
1379         return;
1380     }
1381
1382     p_object->i_refcount++;
1383
1384     p_list->p_values[i_index].p_object = p_object;
1385
1386     return;
1387 }
1388
1389 /*static void ListAppend( vlc_list_t *p_list, vlc_object_t *p_object )
1390 {
1391     if( p_list == NULL )
1392     {
1393         return;
1394     }
1395
1396     p_list->p_values = realloc( p_list->p_values, (p_list->i_count + 1)
1397                                 * sizeof( vlc_value_t ) );
1398     if( p_list->p_values == NULL )
1399     {
1400         p_list->i_count = 0;
1401         return;
1402     }
1403
1404     p_object->i_refcount++;
1405
1406     p_list->p_values[p_list->i_count].p_object = p_object;
1407     p_list->i_count++;
1408
1409     return;
1410 }*/
1411
1412 static int CountChildren( vlc_object_t *p_this, int i_type )
1413 {
1414     vlc_object_t *p_tmp;
1415     int i, i_count = 0;
1416
1417     for( i = 0; i < p_this->i_children; i++ )
1418     {
1419         p_tmp = p_this->pp_children[i];
1420
1421         if( p_tmp->i_object_type == i_type )
1422         {
1423             i_count++;
1424         }
1425
1426         if( p_tmp->i_children )
1427         {
1428             i_count += CountChildren( p_tmp, i_type );
1429         }
1430     }
1431
1432     return i_count;
1433 }
1434
1435 static void ListChildren( vlc_list_t *p_list, vlc_object_t *p_this, int i_type )
1436 {
1437     vlc_object_t *p_tmp;
1438     int i;
1439
1440     for( i = 0; i < p_this->i_children; i++ )
1441     {
1442         p_tmp = p_this->pp_children[i];
1443
1444         if( p_tmp->i_object_type == i_type )
1445         {
1446             ListReplace( p_list, p_tmp, p_list->i_count++ );
1447         }
1448
1449         if( p_tmp->i_children )
1450         {
1451             ListChildren( p_list, p_tmp, i_type );
1452         }
1453     }
1454 }