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 #ifndef WIN32
  63 # include <unistd.h>
  64 #else
  65 # include <io.h>
  66 # include <fcntl.h>
  67 #endif
  68
  69 /*****************************************************************************
  70  * Local prototypes
  71  *****************************************************************************/
  72 static int  DumpCommand( vlc_object_t *, char const *,
  73                          vlc_value_t, vlc_value_t, void * );
  74
  75 static vlc_object_t * FindObject    ( vlc_object_t *, int, int );
  76 static vlc_object_t * FindObjectName( vlc_object_t *, const char *, int );
  77 static void           DetachObject  ( vlc_object_t * );
  78 static void           PrintObject   ( vlc_object_t *, const char * );
  79 static void           DumpStructure ( vlc_object_t *, int, char * );
  80 static int            FindIndex     ( vlc_object_t *, vlc_object_t **, int );
  81 static void           SetAttachment ( vlc_object_t *, vlc_bool_t );
  82
  83 static vlc_list_t   * NewList       ( int );
  84 static void           ListReplace   ( vlc_list_t *, vlc_object_t *, int );
  85 /*static void           ListAppend    ( vlc_list_t *, vlc_object_t * );*/
  86 static int            CountChildren ( vlc_object_t *, int );
  87 static void           ListChildren  ( vlc_list_t *, vlc_object_t *, int );
  88
  89 /*****************************************************************************
  90  * Local structure lock
  91  *****************************************************************************/
  92 static vlc_mutex_t    structure_lock;
  93 static vlc_object_internals_t global_internals;
  94
  95 vlc_object_t *vlc_custom_create( vlc_object_t *p_this, size_t i_size,
  96                                  int i_type, const char *psz_type )
  97 {
  98     vlc_object_t *p_new;
  99     vlc_object_internals_t *p_priv;
 100
 101     if( i_type == VLC_OBJECT_GLOBAL )
 102     {
 103         p_new = p_this;
 104         p_priv = &global_internals;
 105         memset( p_priv, 0, sizeof( *p_priv ) );
 106     }
 107     else
 108     {
 109         p_priv = calloc( 1, sizeof( *p_priv ) + i_size );
 110         if( p_priv == NULL )
 111             return NULL;
 112
 113         p_new = (vlc_object_t *)(p_priv + 1);
 114     }
 115
 116     p_new->p_internals = p_priv;
 117     p_new->i_object_type = i_type;
 118     p_new->psz_object_type = psz_type;
 119
 120     p_new->psz_object_name = NULL;
 121
 122     p_new->b_die = VLC_FALSE;
 123     p_new->b_error = VLC_FALSE;
 124     p_new->b_dead = VLC_FALSE;
 125     p_priv->b_attached = VLC_FALSE;
 126     p_new->b_force = VLC_FALSE;
 127
 128     p_new->psz_header = NULL;
 129
 130     if( p_this->i_flags & OBJECT_FLAGS_NODBG )
 131         p_new->i_flags |= OBJECT_FLAGS_NODBG;
 132     if( p_this->i_flags & OBJECT_FLAGS_QUIET )
 133         p_new->i_flags |= OBJECT_FLAGS_QUIET;
 134     if( p_this->i_flags & OBJECT_FLAGS_NOINTERACT )
 135         p_new->i_flags |= OBJECT_FLAGS_NOINTERACT;
 136
 137     p_priv->p_vars = calloc( sizeof( variable_t ), 16 );
 138
 139     if( !p_priv->p_vars )
 140     {
 141         if( i_type != VLC_OBJECT_GLOBAL )
 142             free( p_priv );
 143         return NULL;
 144     }
 145
 146     if( i_type == VLC_OBJECT_GLOBAL )
 147     {
 148         /* If i_type is global, then p_new is actually p_libvlc_global */
 149         libvlc_global_data_t *p_libvlc_global = (libvlc_global_data_t *)p_new;
 150         p_new->p_libvlc = NULL;
 151
 152         p_libvlc_global->i_counter = 0;
 153         p_new->i_object_id = 0;
 154
 155         p_libvlc_global->i_objects = 1;
 156         p_libvlc_global->pp_objects = malloc( sizeof(vlc_object_t *) );
 157         p_libvlc_global->pp_objects[0] = p_new;
 158         p_priv->b_attached = VLC_TRUE;
 159     }
 160     else
 161     {
 162         libvlc_global_data_t *p_libvlc_global = vlc_global();
 163         if( i_type == VLC_OBJECT_LIBVLC )
 164         {
 165             p_new->p_libvlc = (libvlc_int_t*)p_new;
 166             p_priv->b_attached = VLC_TRUE;
 167         }
 168         else
 169         {
 170             p_new->p_libvlc = p_this->p_libvlc;
 171         }
 172
 173         vlc_mutex_lock( &structure_lock );
 174
 175         p_libvlc_global->i_counter++;
 176         p_new->i_object_id = p_libvlc_global->i_counter;
 177
 178         /* Wooohaa! If *this* fails, we're in serious trouble! Anyway it's
 179          * useless to try and recover anything if pp_objects gets smashed. */
 180         TAB_APPEND( p_libvlc_global->i_objects, p_libvlc_global->pp_objects,
 181                     p_new );
 182
 183         vlc_mutex_unlock( &structure_lock );
 184     }
 185
 186     p_priv->i_refcount = 0;
 187     p_new->p_parent = NULL;
 188     p_new->pp_children = NULL;
 189     p_new->i_children = 0;
 190
 191     p_new->p_private = NULL;
 192
 193     /* Initialize mutexes and condvars */
 194     vlc_mutex_init( p_new, &p_new->object_lock );
 195     vlc_cond_init( p_new, &p_new->object_wait );
 196     vlc_mutex_init( p_new, &p_priv->var_lock );
 197     p_priv->pipes[0] = p_priv->pipes[1] = -1;
 198
 199     if( i_type == VLC_OBJECT_GLOBAL )
 200     {
 201         vlc_mutex_init( p_new, &structure_lock );
 202     }
 203
 204     if( i_type == VLC_OBJECT_LIBVLC )
 205     {
 206         var_Create( p_new, "list", VLC_VAR_STRING | VLC_VAR_ISCOMMAND );
 207         var_AddCallback( p_new, "list", DumpCommand, NULL );
 208         var_Create( p_new, "tree", VLC_VAR_STRING | VLC_VAR_ISCOMMAND );
 209         var_AddCallback( p_new, "tree", DumpCommand, NULL );
 210         var_Create( p_new, "vars", VLC_VAR_STRING | VLC_VAR_ISCOMMAND );
 211         var_AddCallback( p_new, "vars", DumpCommand, NULL );
 212     }
 213
 214     return p_new;
 215 }
 216
 217
 218 /**
 219  * Allocates and initializes a vlc object.
 220  *
 221  * @param i_type known object type (all of them are negative integer values),
 222  *               or object byte size (always positive).
 223  *
 224  * @return the new object, or NULL on error.
 225  */
 226 void * __vlc_object_create( vlc_object_t *p_this, int i_type )
 227 {
 228     const char   * psz_type;
 229     size_t         i_size;
 230
 231     switch( i_type )
 232     {
 233         case VLC_OBJECT_GLOBAL:
 234             i_size = sizeof(libvlc_global_data_t);
 235             psz_type = "global";
 236             break;
 237         case VLC_OBJECT_LIBVLC:
 238             i_size = sizeof(libvlc_int_t);
 239             psz_type = "libvlc";
 240             break;
 241         case VLC_OBJECT_INTF:
 242             i_size = sizeof(intf_thread_t);
 243             psz_type = "interface";
 244             break;
 245         case VLC_OBJECT_DIALOGS:
 246             i_size = sizeof(intf_thread_t);
 247             psz_type = "dialogs";
 248             break;
 249         case VLC_OBJECT_PLAYLIST:
 250             i_size = sizeof(playlist_t);
 251             psz_type = "playlist";
 252             break;
 253         case VLC_OBJECT_SD:
 254             i_size = sizeof(services_discovery_t);
 255             psz_type = "services discovery";
 256             break;
 257         case VLC_OBJECT_INPUT:
 258             i_size = sizeof(input_thread_t);
 259             psz_type = "input";
 260             break;
 261         case VLC_OBJECT_DEMUX:
 262             i_size = sizeof(demux_t);
 263             psz_type = "demux";
 264             break;
 265         case VLC_OBJECT_ACCESS:
 266             i_size = sizeof(access_t);
 267             psz_type = "access";
 268             break;
 269         case VLC_OBJECT_DECODER:
 270             i_size = sizeof(decoder_t);
 271             psz_type = "decoder";
 272             break;
 273         case VLC_OBJECT_PACKETIZER:
 274             i_size = sizeof(decoder_t);
 275             psz_type = "packetizer";
 276             break;
 277         case VLC_OBJECT_ENCODER:
 278             i_size = sizeof(encoder_t);
 279             psz_type = "encoder";
 280             break;
 281         case VLC_OBJECT_FILTER:
 282             i_size = sizeof(filter_t);
 283             psz_type = "filter";
 284             break;
 285         case VLC_OBJECT_VOUT:
 286             i_size = sizeof(vout_thread_t);
 287             psz_type = "video output";
 288             break;
 289         case VLC_OBJECT_SPU:
 290             i_size = sizeof(spu_t);
 291             psz_type = "subpicture";
 292             break;
 293         case VLC_OBJECT_AOUT:
 294             i_size = sizeof(aout_instance_t);
 295             psz_type = "audio output";
 296             break;
 297         case VLC_OBJECT_SOUT:
 298             i_size = sizeof(sout_instance_t);
 299             psz_type = "stream output";
 300             break;
 301         case VLC_OBJECT_VLM:
 302             i_size = sizeof( vlm_t );
 303             psz_type = "vlm dameon";
 304             break;
 305         case VLC_OBJECT_VOD:
 306             i_size = sizeof( vod_t );
 307             psz_type = "vod server";
 308             break;
 309         case VLC_OBJECT_XML:
 310             i_size = sizeof( xml_t );
 311             psz_type = "xml";
 312             break;
 313         case VLC_OBJECT_OPENGL:
 314             i_size = sizeof( vout_thread_t );
 315             psz_type = "opengl";
 316             break;
 317         case VLC_OBJECT_ANNOUNCE:
 318             i_size = sizeof( announce_handler_t );
 319             psz_type = "announce";
 320             break;
 321         case VLC_OBJECT_META_ENGINE:
 322             i_size = sizeof( meta_engine_t );
 323             psz_type = "meta engine";
 324             break;
 325         case VLC_OBJECT_OSDMENU:
 326             i_size = sizeof( osd_menu_t );
 327             psz_type = "osd menu";
 328             break;
 329         default:
 330             i_size = i_type > (int)sizeof(vlc_object_t)
 331                          ? i_type : (int)sizeof(vlc_object_t);
 332             i_type = VLC_OBJECT_GENERIC;
 333             psz_type = "generic";
 334             break;
 335     }
 336
 337     return vlc_custom_create( p_this, i_size, i_type, psz_type );
 338 }
 339
 340
 341 /**
 342  ****************************************************************************
 343  * Destroy a vlc object
 344  *
 345  * This function destroys an object that has been previously allocated with
 346  * vlc_object_create. The object's refcount must be zero and it must not be
 347  * attached to other objects in any way.
 348  *****************************************************************************/
 349 void __vlc_object_destroy( vlc_object_t *p_this )
 350 {
 351     vlc_object_internals_t *p_priv = vlc_internals( p_this );
 352     int i_delay = 0;
 353
 354     if( p_this->i_children )
 355     {
 356         msg_Err( p_this, "cannot delete object (%i, %s) with children" ,
 357                  p_this->i_object_id, p_this->psz_object_name );
 358         return;
 359     }
 360
 361     if( p_this->p_parent )
 362     {
 363         msg_Err( p_this, "cannot delete object (%i, %s) with a parent",
 364                  p_this->i_object_id, p_this->psz_object_name );
 365         return;
 366     }
 367
 368     while( p_priv->i_refcount > 0 )
 369     {
 370         i_delay++;
 371
 372         /* Don't warn immediately ... 100ms seems OK */
 373         if( i_delay == 2 )
 374         {
 375             msg_Warn( p_this,
 376                   "refcount is %u, delaying before deletion (id=%d,type=%d)",
 377                   p_priv->i_refcount, p_this->i_object_id,
 378                   p_this->i_object_type );
 379         }
 380         else if( i_delay == 10 )
 381         {
 382             msg_Err( p_this,
 383                   "refcount is %u, delaying again (id=%d,type=%d)",
 384                   p_priv->i_refcount, p_this->i_object_id,
 385                   p_this->i_object_type );
 386         }
 387         else if( i_delay == 20 )
 388         {
 389             msg_Err( p_this,
 390                   "waited too long, cancelling destruction (id=%d,type=%d)",
 391                   p_this->i_object_id, p_this->i_object_type );
 392             return;
 393         }
 394
 395         msleep( 100000 );
 396     }
 397
 398     /* Destroy the associated variables, starting from the end so that
 399      * no memmove calls have to be done. */
 400     while( p_priv->i_vars )
 401     {
 402         var_Destroy( p_this, p_priv->p_vars[p_priv->i_vars - 1].psz_name );
 403     }
 404
 405     free( p_priv->p_vars );
 406     vlc_mutex_destroy( &p_priv->var_lock );
 407
 408     if( p_this->psz_header ) free( p_this->psz_header );
 409
 410     if( p_this->i_object_type == VLC_OBJECT_GLOBAL )
 411     {
 412         libvlc_global_data_t *p_global = (libvlc_global_data_t *)p_this;
 413         /* We are the global object ... no need to lock. */
 414         free( p_global->pp_objects );
 415         p_global->pp_objects = NULL;
 416         p_global->i_objects--;
 417
 418         vlc_mutex_destroy( &structure_lock );
 419     }
 420     else
 421     {
 422         libvlc_global_data_t *p_libvlc_global = vlc_global();
 423         int i_index;
 424
 425         vlc_mutex_lock( &structure_lock );
 426
 427         /* Wooohaa! If *this* fails, we're in serious trouble! Anyway it's
 428          * useless to try and recover anything if pp_objects gets smashed. */
 429         i_index = FindIndex( p_this, p_libvlc_global->pp_objects,
 430                              p_libvlc_global->i_objects );
 431         REMOVE_ELEM( p_libvlc_global->pp_objects,
 432                      p_libvlc_global->i_objects, i_index );
 433
 434         vlc_mutex_unlock( &structure_lock );
 435     }
 436
 437 #if defined(WIN32) || defined(UNDER_CE)
 438     /* if object has an associated thread, close it now */
 439     if( p_priv->thread_id.hThread )
 440        CloseHandle(p_priv->thread_id.hThread);
 441 #endif
 442
 443     vlc_mutex_destroy( &p_this->object_lock );
 444     vlc_cond_destroy( &p_this->object_wait );
 445     if( p_priv->pipes[0] != -1 )
 446         close( p_priv->pipes[0] );
 447     if( p_priv->pipes[1] != -1 )
 448         close( p_priv->pipes[1] );
 449
 450     /* global is not dynamically allocated by vlc_object_create */
 451     if( p_this->i_object_type != VLC_OBJECT_GLOBAL )
 452         free( p_priv );
 453 }
 454
 455
 456 /** Inter-object signaling */
 457
 458 void __vlc_object_lock( vlc_object_t *obj )
 459 {
 460     vlc_mutex_lock( &obj->object_lock );
 461 }
 462
 463 void __vlc_object_unlock( vlc_object_t *obj )
 464 {
 465     vlc_assert_locked( &obj->object_lock );
 466     vlc_mutex_unlock( &obj->object_lock );
 467 }
 468
 469 /**
 470  * Returns the readable end of a pipe that becomes readable whenever
 471  * an object is signaled. This can be used to wait for VLC object events
 472  * inside select(), poll() loops or frameworks providing an event loop.
 473  *
 474  * Note that the pipe will remain the same for the lifetime of the object.
 475  * DO NOT close it yourself. Ever.
 476  *
 477  * DO NOT try to read from the pipe either: call vlc_object_wait() instead.
 478  * Assuming the pipe is readable, vlc_object_wait() will not block.
 479  * Also note that, as with vlc_object_wait(), there may be spurious wakeups.
 480  *
 481  * @param obj object that would be signaled (object lock MUST hold)
 482  * @return a readable pipe descriptor, or -1 on error.
 483  */
 484 int vlc_object_waitpipe( vlc_object_t *obj )
 485 {
 486     int *pipes = obj->p_internals->pipes;
 487     vlc_assert_locked( &obj->object_lock );
 488
 489     if( pipes[1] == -1 )
 490     {
 491         /* This can only ever happen if someone killed us without locking */
 492         assert( pipes[0] == -1 );
 493
 494 #ifndef WIN32
 495         if( pipe( pipes ) )
 496 #else
 497         if( _pipe( pipes, 1, _O_BINARY ) )
 498 #endif
 499             return -1;
 500     }
 501
 502     return pipes[0];
 503 }
 504
 505
 506 /**
 507  * Waits for the object to be signaled (using vlc_object_signal()).
 508  * If the object already has a signal pending, this function will return
 509  * immediately. It is asserted that the caller holds the object lock.
 510  *
 511  * @return true if the object is dying and should terminate.
 512  */
 513 vlc_bool_t __vlc_object_wait( vlc_object_t *obj )
 514 {
 515     vlc_assert_locked( &obj->object_lock );
 516
 517     int fd = obj->p_internals->pipes[0];
 518     if( ( fd != -1 )
 519      && ( read( fd, &(char){ 0 }, 1 ) == 0 ) )
 520     {
 521         close( fd );
 522         obj->p_internals->pipes[1] = -1;
 523     }
 524
 525     vlc_cond_wait( &obj->object_wait, &obj->object_lock );
 526     return obj->b_die;
 527 }
 528
 529
 530 /**
 531  * Waits for the object to be signaled (using vlc_object_signal()), or for
 532  * a timer to expire.
 533  * If the object already has a signal pending, this function will return
 534  * immediately. It is asserted that the caller holds the object lock.
 535  *
 536  * @return negative if the object is dying and should terminate,
 537  * positive if the the object has been signaled but is not dying,
 538  * 0 if timeout has been reached.
 539  */
 540 int __vlc_object_timedwait( vlc_object_t *obj, mtime_t deadline )
 541 {
 542     int v;
 543
 544     vlc_assert_locked( &obj->object_lock );
 545     v = vlc_cond_timedwait( &obj->object_wait, &obj->object_lock, deadline );
 546     if( v == 0 ) /* signaled */
 547         return obj->b_die ? -1 : 1;
 548     return 0;
 549 }
 550
 551
 552 /**
 553  * Signals an object for which the lock is held.
 554  */
 555 void __vlc_object_signal_unlocked( vlc_object_t *obj )
 556 {
 557     vlc_assert_locked( &obj->object_lock );
 558
 559     int fd = obj->p_internals->pipes[1];
 560     if( fd != -1 )
 561         while( write( fd, &(char){ 0 }, 1 ) < 0 );
 562
 563     vlc_cond_signal( &obj->object_wait );
 564 }
 565
 566
 567 /**
 568  * Requests termination of an object.
 569  * If the object is LibVLC, also request to terminate all its children.
 570  */
 571 void __vlc_object_kill( vlc_object_t *p_this )
 572 {
 573     vlc_mutex_lock( &p_this->object_lock );
 574     p_this->b_die = VLC_TRUE;
 575
 576     if( p_this->i_object_type == VLC_OBJECT_LIBVLC )
 577         for( int i = 0; i < p_this->i_children ; i++ )
 578             vlc_object_kill( p_this->pp_children[i] );
 579
 580     int fd = p_this->p_internals->pipes[1];
 581     if( fd != -1 )
 582     {
 583         close( fd ); /* closing a pipe makes it readable too */
 584         p_this->p_internals->pipes[1] = -1;
 585     }
 586
 587     vlc_object_signal_unlocked( p_this );
 588     vlc_mutex_unlock( &p_this->object_lock );
 589 }
 590
 591
 592 /**
 593  * find an object given its ID
 594  *
 595  * This function looks for the object whose i_object_id field is i_id. We
 596  * use a dichotomy so that lookups are in log2(n).
 597  *****************************************************************************/
 598 void * __vlc_object_get( vlc_object_t *p_this, int i_id )
 599 {
 600     int i_max, i_middle;
 601     vlc_object_t **pp_objects;
 602     libvlc_global_data_t *p_libvlc_global = vlc_global();
 603
 604     vlc_mutex_lock( &structure_lock );
 605
 606     pp_objects = p_libvlc_global->pp_objects;
 607
 608     /* Perform our dichotomy */
 609     for( i_max = p_libvlc_global->i_objects - 1 ; ; )
 610     {
 611         i_middle = i_max / 2;
 612
 613         if( pp_objects[i_middle]->i_object_id > i_id )
 614         {
 615             i_max = i_middle;
 616         }
 617         else if( pp_objects[i_middle]->i_object_id < i_id )
 618         {
 619             if( i_middle )
 620             {
 621                 pp_objects += i_middle;
 622                 i_max -= i_middle;
 623             }
 624             else
 625             {
 626                 /* This happens when there are only two remaining objects */
 627                 if( pp_objects[i_middle+1]->i_object_id == i_id )
 628                 {
 629                     vlc_mutex_unlock( &structure_lock );
 630                     pp_objects[i_middle+1]->p_internals->i_refcount++;
 631                     return pp_objects[i_middle+1];
 632                 }
 633                 break;
 634             }
 635         }
 636         else
 637         {
 638             vlc_mutex_unlock( &structure_lock );
 639             pp_objects[i_middle]->p_internals->i_refcount++;
 640             return pp_objects[i_middle];
 641         }
 642
 643         if( i_max == 0 )
 644         {
 645             /* this means that i_max == i_middle, and since we have already
 646              * tested pp_objects[i_middle]), p_found is properly set. */
 647             break;
 648         }
 649     }
 650
 651     vlc_mutex_unlock( &structure_lock );
 652     return NULL;
 653 }
 654
 655 /**
 656  ****************************************************************************
 657  * find a typed object and increment its refcount
 658  *****************************************************************************
 659  * This function recursively looks for a given object type. i_mode can be one
 660  * of FIND_PARENT, FIND_CHILD or FIND_ANYWHERE.
 661  *****************************************************************************/
 662 void * __vlc_object_find( vlc_object_t *p_this, int i_type, int i_mode )
 663 {
 664     vlc_object_t *p_found;
 665
 666     vlc_mutex_lock( &structure_lock );
 667
 668     /* If we are of the requested type ourselves, don't look further */
 669     if( !(i_mode & FIND_STRICT) && p_this->i_object_type == i_type )
 670     {
 671         p_this->p_internals->i_refcount++;
 672         vlc_mutex_unlock( &structure_lock );
 673         return p_this;
 674     }
 675
 676     /* Otherwise, recursively look for the object */
 677     if( (i_mode & 0x000f) == FIND_ANYWHERE )
 678     {
 679         vlc_object_t *p_root = p_this;
 680
 681         /* Find the root */
 682         while( p_root->p_parent != NULL &&
 683                p_root != VLC_OBJECT( p_this->p_libvlc ) )
 684         {
 685             p_root = p_root->p_parent;
 686         }
 687
 688         p_found = FindObject( p_root, i_type, (i_mode & ~0x000f)|FIND_CHILD );
 689         if( p_found == NULL && p_root != VLC_OBJECT( p_this->p_libvlc ) )
 690         {
 691             p_found = FindObject( VLC_OBJECT( p_this->p_libvlc ),
 692                                   i_type, (i_mode & ~0x000f)|FIND_CHILD );
 693         }
 694     }
 695     else
 696     {
 697         p_found = FindObject( p_this, i_type, i_mode );
 698     }
 699
 700     vlc_mutex_unlock( &structure_lock );
 701
 702     return p_found;
 703 }
 704
 705 /**
 706  ****************************************************************************
 707  * find a named object and increment its refcount
 708  *****************************************************************************
 709  * This function recursively looks for a given object name. i_mode can be one
 710  * of FIND_PARENT, FIND_CHILD or FIND_ANYWHERE.
 711  *****************************************************************************/
 712 void * __vlc_object_find_name( vlc_object_t *p_this, const char *psz_name,
 713                                int i_mode )
 714 {
 715     vlc_object_t *p_found;
 716
 717     vlc_mutex_lock( &structure_lock );
 718
 719     /* If have the requested name ourselves, don't look further */
 720     if( !(i_mode & FIND_STRICT)
 721         && p_this->psz_object_name
 722         && !strcmp( p_this->psz_object_name, psz_name ) )
 723     {
 724         p_this->p_internals->i_refcount++;
 725         vlc_mutex_unlock( &structure_lock );
 726         return p_this;
 727     }
 728
 729     /* Otherwise, recursively look for the object */
 730     if( (i_mode & 0x000f) == FIND_ANYWHERE )
 731     {
 732         vlc_object_t *p_root = p_this;
 733
 734         /* Find the root */
 735         while( p_root->p_parent != NULL &&
 736                p_root != VLC_OBJECT( p_this->p_libvlc ) )
 737         {
 738             p_root = p_root->p_parent;
 739         }
 740
 741         p_found = FindObjectName( p_root, psz_name,
 742                                  (i_mode & ~0x000f)|FIND_CHILD );
 743         if( p_found == NULL && p_root != VLC_OBJECT( p_this->p_libvlc ) )
 744         {
 745             p_found = FindObjectName( VLC_OBJECT( p_this->p_libvlc ),
 746                                       psz_name, (i_mode & ~0x000f)|FIND_CHILD );
 747         }
 748     }
 749     else
 750     {
 751         p_found = FindObjectName( p_this, psz_name, i_mode );
 752     }
 753
 754     vlc_mutex_unlock( &structure_lock );
 755
 756     return p_found;
 757 }
 758
 759 /**
 760  ****************************************************************************
 761  * increment an object refcount
 762  *****************************************************************************/
 763 void __vlc_object_yield( vlc_object_t *p_this )
 764 {
 765     vlc_mutex_lock( &structure_lock );
 766     p_this->p_internals->i_refcount++;
 767     vlc_mutex_unlock( &structure_lock );
 768 }
 769
 770 static inline void Release( vlc_object_t *obj )
 771 {
 772     assert( obj->p_internals->i_refcount > 0 );
 773     obj->p_internals->i_refcount--;
 774 }
 775
 776 /*****************************************************************************
 777  * decrement an object refcount
 778  *****************************************************************************/
 779 void __vlc_object_release( vlc_object_t *p_this )
 780 {
 781     vlc_mutex_lock( &structure_lock );
 782     Release( p_this );
 783     vlc_mutex_unlock( &structure_lock );
 784 }
 785
 786 /**
 787  ****************************************************************************
 788  * attach object to a parent object
 789  *****************************************************************************
 790  * This function sets p_this as a child of p_parent, and p_parent as a parent
 791  * of p_this. This link can be undone using vlc_object_detach.
 792  *****************************************************************************/
 793 void __vlc_object_attach( vlc_object_t *p_this, vlc_object_t *p_parent )
 794 {
 795     if( !p_this ) return;
 796
 797     vlc_mutex_lock( &structure_lock );
 798
 799     /* Attach the parent to its child */
 800     p_this->p_parent = p_parent;
 801
 802     /* Attach the child to its parent */
 803     INSERT_ELEM( p_parent->pp_children, p_parent->i_children,
 804                  p_parent->i_children, p_this );
 805
 806     /* Climb up the tree to see whether we are connected with the root */
 807     if( p_parent->p_internals->b_attached )
 808     {
 809         SetAttachment( p_this, VLC_TRUE );
 810     }
 811
 812     vlc_mutex_unlock( &structure_lock );
 813 }
 814
 815 /**
 816  ****************************************************************************
 817  * detach object from its parent
 818  *****************************************************************************
 819  * This function removes all links between an object and its parent.
 820  *****************************************************************************/
 821 void __vlc_object_detach( vlc_object_t *p_this )
 822 {
 823     if( !p_this ) return;
 824
 825     vlc_mutex_lock( &structure_lock );
 826     if( !p_this->p_parent )
 827     {
 828         msg_Err( p_this, "object is not attached" );
 829         vlc_mutex_unlock( &structure_lock );
 830         return;
 831     }
 832
 833     /* Climb up the tree to see whether we are connected with the root */
 834     if( p_this->p_parent->p_internals->b_attached )
 835     {
 836         SetAttachment( p_this, VLC_FALSE );
 837     }
 838
 839     DetachObject( p_this );
 840     vlc_mutex_unlock( &structure_lock );
 841     p_this = NULL;
 842 }
 843
 844 /**
 845  ****************************************************************************
 846  * find a list typed objects and increment their refcount
 847  *****************************************************************************
 848  * This function recursively looks for a given object type. i_mode can be one
 849  * of FIND_PARENT, FIND_CHILD or FIND_ANYWHERE.
 850  *****************************************************************************/
 851 vlc_list_t * __vlc_list_find( vlc_object_t *p_this, int i_type, int i_mode )
 852 {
 853     vlc_list_t *p_list;
 854     vlc_object_t **pp_current, **pp_end;
 855     int i_count = 0, i_index = 0;
 856     libvlc_global_data_t *p_libvlc_global = vlc_global();
 857
 858     vlc_mutex_lock( &structure_lock );
 859
 860     /* Look for the objects */
 861     switch( i_mode & 0x000f )
 862     {
 863     case FIND_ANYWHERE:
 864         pp_current = p_libvlc_global->pp_objects;
 865         pp_end = pp_current + p_libvlc_global->i_objects;
 866
 867         for( ; pp_current < pp_end ; pp_current++ )
 868         {
 869             if( (*pp_current)->p_internals->b_attached
 870                  && (*pp_current)->i_object_type == i_type )
 871             {
 872                 i_count++;
 873             }
 874         }
 875
 876         p_list = NewList( i_count );
 877         pp_current = p_libvlc_global->pp_objects;
 878
 879         for( ; pp_current < pp_end ; pp_current++ )
 880         {
 881             if( (*pp_current)->p_internals->b_attached
 882                  && (*pp_current)->i_object_type == i_type )
 883             {
 884                 ListReplace( p_list, *pp_current, i_index );
 885                 if( i_index < i_count ) i_index++;
 886             }
 887         }
 888     break;
 889
 890     case FIND_CHILD:
 891         i_count = CountChildren( p_this, i_type );
 892         p_list = NewList( i_count );
 893
 894         /* Check allocation was successful */
 895         if( p_list->i_count != i_count )
 896         {
 897             msg_Err( p_this, "list allocation failed!" );
 898             p_list->i_count = 0;
 899             break;
 900         }
 901
 902         p_list->i_count = 0;
 903         ListChildren( p_list, p_this, i_type );
 904         break;
 905
 906     default:
 907         msg_Err( p_this, "unimplemented!" );
 908         p_list = NewList( 0 );
 909         break;
 910     }
 911
 912     vlc_mutex_unlock( &structure_lock );
 913
 914     return p_list;
 915 }
 916
 917 /*****************************************************************************
 918  * DumpCommand: print the current vlc structure
 919  *****************************************************************************
 920  * This function prints either an ASCII tree showing the connections between
 921  * vlc objects, and additional information such as their refcount, thread ID,
 922  * etc. (command "tree"), or the same data as a simple list (command "list").
 923  *****************************************************************************/
 924 static int DumpCommand( vlc_object_t *p_this, char const *psz_cmd,
 925                         vlc_value_t oldval, vlc_value_t newval, void *p_data )
 926 {
 927     libvlc_global_data_t *p_libvlc_global = vlc_global();
 928
 929     (void)oldval; (void)p_data;
 930     if( *psz_cmd == 'l' )
 931     {
 932         vlc_mutex_lock( &structure_lock );
 933
 934         vlc_object_t **pp_current, **pp_end;
 935
 936         pp_current = p_libvlc_global->pp_objects;
 937         pp_end = pp_current + p_libvlc_global->i_objects;
 938
 939         for( ; pp_current < pp_end ; pp_current++ )
 940         {
 941             if( (*pp_current)->p_internals->b_attached )
 942             {
 943                 PrintObject( *pp_current, "" );
 944             }
 945             else
 946             {
 947                 printf( " o %.8i %s (not attached)\n",
 948                         (*pp_current)->i_object_id,
 949                         (*pp_current)->psz_object_type );
 950             }
 951         }
 952
 953         vlc_mutex_unlock( &structure_lock );
 954     }
 955     else
 956     {
 957         vlc_object_t *p_object = NULL;
 958
 959         if( *newval.psz_string )
 960         {
 961             char *end;
 962             int i_id = strtol( newval.psz_string, &end, 0 );
 963             if( end != newval.psz_string )
 964                 p_object = vlc_object_get( p_this, i_id );
 965             else
 966             {
 967                 /* try using the object's name to find it */
 968                 vlc_object_t *p_libvlc = vlc_object_get( p_this, 1 );
 969                 if( p_libvlc )
 970                 {
 971                     /* Look in p_libvlc's children tree */
 972                     p_object = vlc_object_find_name( p_libvlc,
 973                                                      newval.psz_string,
 974                                                      FIND_CHILD );
 975                     vlc_object_release( p_libvlc );
 976                 }
 977                 if( !p_object )
 978                 {
 979                     /* If it's not in libvlc, look in libvlc_global (== p_this) */
 980                     p_object = vlc_object_find_name( p_this,
 981                                                      newval.psz_string,
 982                                                      FIND_CHILD );
 983                 }
 984             }
 985
 986             if( !p_object )
 987             {
 988                 return VLC_ENOOBJ;
 989             }
 990         }
 991
 992         vlc_mutex_lock( &structure_lock );
 993
 994         if( *psz_cmd == 't' )
 995         {
 996             char psz_foo[2 * MAX_DUMPSTRUCTURE_DEPTH + 1];
 997
 998             if( !p_object )
 999                 p_object = p_this->p_libvlc ? VLC_OBJECT(p_this->p_libvlc) : p_this;
1000
1001             psz_foo[0] = '|';
1002             DumpStructure( p_object, 0, psz_foo );
1003         }
1004         else if( *psz_cmd == 'v' )
1005         {
1006             int i;
1007
1008             if( !p_object )
1009                 p_object = p_this->p_libvlc ? VLC_OBJECT(p_this->p_libvlc) : p_this;
1010
1011             PrintObject( p_object, "" );
1012
1013             if( !p_object->p_internals->i_vars )
1014                 printf( " `-o No variables\n" );
1015             for( i = 0; i < p_object->p_internals->i_vars; i++ )
1016             {
1017                 variable_t *p_var = p_object->p_internals->p_vars + i;
1018
1019                 const char *psz_type = "unknown";
1020                 switch( p_var->i_type & VLC_VAR_TYPE )
1021                 {
1022 #define MYCASE( type, nice )                \
1023                     case VLC_VAR_ ## type:  \
1024                         psz_type = nice;    \
1025                         break;
1026                     MYCASE( VOID, "void" );
1027                     MYCASE( BOOL, "bool" );
1028                     MYCASE( INTEGER, "integer" );
1029                     MYCASE( HOTKEY, "hotkey" );
1030                     MYCASE( STRING, "string" );
1031                     MYCASE( MODULE, "module" );
1032                     MYCASE( FILE, "file" );
1033                     MYCASE( DIRECTORY, "directory" );
1034                     MYCASE( VARIABLE, "variable" );
1035                     MYCASE( FLOAT, "float" );
1036                     MYCASE( TIME, "time" );
1037                     MYCASE( ADDRESS, "address" );
1038                     MYCASE( MUTEX, "mutex" );
1039                     MYCASE( LIST, "list" );
1040 #undef MYCASE
1041                 }
1042                 printf( " %c-o \"%s\" (%s",
1043                         i + 1 == p_object->p_internals->i_vars ? '`' : '|',
1044                         p_var->psz_name, psz_type );
1045                 if( p_var->psz_text )
1046                     printf( ", %s", p_var->psz_text );
1047                 printf( ")" );
1048                 if( p_var->i_type & VLC_VAR_ISCOMMAND )
1049                     printf( ", command" );
1050                 if( p_var->i_entries )
1051                     printf( ", %d callbacks", p_var->i_entries );
1052                 switch( p_var->i_type & 0x00f0 )
1053                 {
1054                     case VLC_VAR_VOID:
1055                     case VLC_VAR_MUTEX:
1056                         break;
1057                     case VLC_VAR_BOOL:
1058                         printf( ": %s", p_var->val.b_bool ? "true" : "false" );
1059                         break;
1060                     case VLC_VAR_INTEGER:
1061                         printf( ": %d", p_var->val.i_int );
1062                         break;
1063                     case VLC_VAR_STRING:
1064                         printf( ": \"%s\"", p_var->val.psz_string );
1065                         break;
1066                     case VLC_VAR_FLOAT:
1067                         printf( ": %f", p_var->val.f_float );
1068                         break;
1069                     case VLC_VAR_TIME:
1070                         printf( ": " I64Fi, (int64_t)p_var->val.i_time );
1071                         break;
1072                     case VLC_VAR_ADDRESS:
1073                         printf( ": %p", p_var->val.p_address );
1074                         break;
1075                     case VLC_VAR_LIST:
1076                         printf( ": TODO" );
1077                         break;
1078                 }
1079                 printf( "\n" );
1080             }
1081         }
1082
1083         vlc_mutex_unlock( &structure_lock );
1084
1085         if( *newval.psz_string )
1086         {
1087             vlc_object_release( p_object );
1088         }
1089     }
1090
1091     return VLC_SUCCESS;
1092 }
1093
1094 /*****************************************************************************
1095  * vlc_list_release: free a list previously allocated by vlc_list_find
1096  *****************************************************************************
1097  * This function decreases the refcount of all objects in the list and
1098  * frees the list.
1099  *****************************************************************************/
1100 void vlc_list_release( vlc_list_t *p_list )
1101 {
1102     int i_index;
1103
1104     vlc_mutex_lock( &structure_lock );
1105     for( i_index = 0; i_index < p_list->i_count; i_index++ )
1106     {
1107         Release( p_list->p_values[i_index].p_object );
1108     }
1109     vlc_mutex_unlock( &structure_lock );
1110
1111     free( p_list->p_values );
1112     free( p_list );
1113 }
1114
1115 /* Following functions are local */
1116
1117 /*****************************************************************************
1118  * FindIndex: find the index of an object in an array of objects
1119  *****************************************************************************
1120  * This function assumes that p_this can be found in pp_objects. It will not
1121  * crash if p_this cannot be found, but will return a wrong value. It is your
1122  * duty to check the return value if you are not certain that the object could
1123  * be found for sure.
1124  *****************************************************************************/
1125 static int FindIndex( vlc_object_t *p_this,
1126                       vlc_object_t **pp_objects, int i_count )
1127 {
1128     int i_middle = i_count / 2;
1129
1130     if( i_count == 0 )
1131     {
1132         return 0;
1133     }
1134
1135     if( pp_objects[i_middle] == p_this )
1136     {
1137         return i_middle;
1138     }
1139
1140     if( i_count == 1 )
1141     {
1142         return 0;
1143     }
1144
1145     /* We take advantage of the sorted array */
1146     if( pp_objects[i_middle]->i_object_id < p_this->i_object_id )
1147     {
1148         return i_middle + FindIndex( p_this, pp_objects + i_middle,
1149                                              i_count - i_middle );
1150     }
1151     else
1152     {
1153         return FindIndex( p_this, pp_objects, i_middle );
1154     }
1155 }
1156
1157 static vlc_object_t * FindObject( vlc_object_t *p_this, int i_type, int i_mode )
1158 {
1159     int i;
1160     vlc_object_t *p_tmp;
1161
1162     switch( i_mode & 0x000f )
1163     {
1164     case FIND_PARENT:
1165         p_tmp = p_this->p_parent;
1166         if( p_tmp )
1167         {
1168             if( p_tmp->i_object_type == i_type )
1169             {
1170                 p_tmp->p_internals->i_refcount++;
1171                 return p_tmp;
1172             }
1173             else
1174             {
1175                 return FindObject( p_tmp, i_type, i_mode );
1176             }
1177         }
1178         break;
1179
1180     case FIND_CHILD:
1181         for( i = p_this->i_children; i--; )
1182         {
1183             p_tmp = p_this->pp_children[i];
1184             if( p_tmp->i_object_type == i_type )
1185             {
1186                 p_tmp->p_internals->i_refcount++;
1187                 return p_tmp;
1188             }
1189             else if( p_tmp->i_children )
1190             {
1191                 p_tmp = FindObject( p_tmp, i_type, i_mode );
1192                 if( p_tmp )
1193                 {
1194                     return p_tmp;
1195                 }
1196             }
1197         }
1198         break;
1199
1200     case FIND_ANYWHERE:
1201         /* Handled in vlc_object_find */
1202         break;
1203     }
1204
1205     return NULL;
1206 }
1207
1208 static vlc_object_t * FindObjectName( vlc_object_t *p_this,
1209                                       const char *psz_name,
1210                                       int i_mode )
1211 {
1212     int i;
1213     vlc_object_t *p_tmp;
1214
1215     switch( i_mode & 0x000f )
1216     {
1217     case FIND_PARENT:
1218         p_tmp = p_this->p_parent;
1219         if( p_tmp )
1220         {
1221             if( p_tmp->psz_object_name
1222                 && !strcmp( p_tmp->psz_object_name, psz_name ) )
1223             {
1224                 p_tmp->p_internals->i_refcount++;
1225                 return p_tmp;
1226             }
1227             else
1228             {
1229                 return FindObjectName( p_tmp, psz_name, i_mode );
1230             }
1231         }
1232         break;
1233
1234     case FIND_CHILD:
1235         for( i = p_this->i_children; i--; )
1236         {
1237             p_tmp = p_this->pp_children[i];
1238             if( p_tmp->psz_object_name
1239                 && !strcmp( p_tmp->psz_object_name, psz_name ) )
1240             {
1241                 p_tmp->p_internals->i_refcount++;
1242                 return p_tmp;
1243             }
1244             else if( p_tmp->i_children )
1245             {
1246                 p_tmp = FindObjectName( p_tmp, psz_name, i_mode );
1247                 if( p_tmp )
1248                 {
1249                     return p_tmp;
1250                 }
1251             }
1252         }
1253         break;
1254
1255     case FIND_ANYWHERE:
1256         /* Handled in vlc_object_find */
1257         break;
1258     }
1259
1260     return NULL;
1261 }
1262
1263 static void DetachObject( vlc_object_t *p_this )
1264 {
1265     vlc_object_t *p_parent = p_this->p_parent;
1266     int i_index, i;
1267
1268     /* Remove p_this's parent */
1269     p_this->p_parent = NULL;
1270
1271     /* Remove all of p_parent's children which are p_this */
1272     for( i_index = p_parent->i_children ; i_index-- ; )
1273     {
1274         if( p_parent->pp_children[i_index] == p_this )
1275         {
1276             p_parent->i_children--;
1277             for( i = i_index ; i < p_parent->i_children ; i++ )
1278             {
1279                 p_parent->pp_children[i] = p_parent->pp_children[i+1];
1280             }
1281         }
1282     }
1283
1284     if( p_parent->i_children )
1285     {
1286         p_parent->pp_children = (vlc_object_t **)realloc( p_parent->pp_children,
1287                                p_parent->i_children * sizeof(vlc_object_t *) );
1288     }
1289     else
1290     {
1291         free( p_parent->pp_children );
1292         p_parent->pp_children = NULL;
1293     }
1294 }
1295
1296 /*****************************************************************************
1297  * SetAttachment: recursively set the b_attached flag of a subtree.
1298  *****************************************************************************
1299  * This function is used by the attach and detach functions to propagate
1300  * the b_attached flag in a subtree.
1301  *****************************************************************************/
1302 static void SetAttachment( vlc_object_t *p_this, vlc_bool_t b_attached )
1303 {
1304     int i_index;
1305
1306     for( i_index = p_this->i_children ; i_index-- ; )
1307     {
1308         SetAttachment( p_this->pp_children[i_index], b_attached );
1309     }
1310
1311     p_this->p_internals->b_attached = b_attached;
1312 }
1313
1314 static void PrintObject( vlc_object_t *p_this, const char *psz_prefix )
1315 {
1316     char psz_children[20], psz_refcount[20], psz_thread[30], psz_name[50],
1317          psz_parent[20];
1318
1319     psz_name[0] = '\0';
1320     if( p_this->psz_object_name )
1321     {
1322         snprintf( psz_name, 49, " \"%s\"", p_this->psz_object_name );
1323         if( psz_name[48] )
1324             psz_name[48] = '\"';
1325     }
1326
1327     psz_children[0] = '\0';
1328     switch( p_this->i_children )
1329     {
1330         case 0:
1331             break;
1332         case 1:
1333             strcpy( psz_children, ", 1 child" );
1334             break;
1335         default:
1336             snprintf( psz_children, 19, ", %i children", p_this->i_children );
1337             break;
1338     }
1339
1340     psz_refcount[0] = '\0';
1341     if( p_this->p_internals->i_refcount > 0 )
1342         snprintf( psz_refcount, 19, ", refcount %u",
1343                   p_this->p_internals->i_refcount );
1344
1345     psz_thread[0] = '\0';
1346     if( p_this->p_internals->b_thread )
1347         snprintf( psz_thread, 29, " (thread %u)",
1348 #if defined(WIN32) || defined(UNDER_CE)
1349                   (unsigned)p_this->p_internals->thread_id.id );
1350 #else
1351                   (unsigned)p_this->p_internals->thread_id );
1352 #endif
1353
1354     psz_parent[0] = '\0';
1355     if( p_this->p_parent )
1356         snprintf( psz_parent, 19, ", parent %i", p_this->p_parent->i_object_id );
1357
1358     printf( " %so %.8i %s%s%s%s%s%s\n", psz_prefix,
1359             p_this->i_object_id, p_this->psz_object_type,
1360             psz_name, psz_thread, psz_refcount, psz_children,
1361             psz_parent );
1362 }
1363
1364 static void DumpStructure( vlc_object_t *p_this, int i_level, char *psz_foo )
1365 {
1366     int i;
1367     char i_back = psz_foo[i_level];
1368     psz_foo[i_level] = '\0';
1369
1370     PrintObject( p_this, psz_foo );
1371
1372     psz_foo[i_level] = i_back;
1373
1374     if( i_level / 2 >= MAX_DUMPSTRUCTURE_DEPTH )
1375     {
1376         msg_Warn( p_this, "structure tree is too deep" );
1377         return;
1378     }
1379
1380     for( i = 0 ; i < p_this->i_children ; i++ )
1381     {
1382         if( i_level )
1383         {
1384             psz_foo[i_level-1] = ' ';
1385
1386             if( psz_foo[i_level-2] == '`' )
1387             {
1388                 psz_foo[i_level-2] = ' ';
1389             }
1390         }
1391
1392         if( i == p_this->i_children - 1 )
1393         {
1394             psz_foo[i_level] = '`';
1395         }
1396         else
1397         {
1398             psz_foo[i_level] = '|';
1399         }
1400
1401         psz_foo[i_level+1] = '-';
1402         psz_foo[i_level+2] = '\0';
1403
1404         DumpStructure( p_this->pp_children[i], i_level + 2, psz_foo );
1405     }
1406 }
1407
1408 static vlc_list_t * NewList( int i_count )
1409 {
1410     vlc_list_t * p_list = (vlc_list_t *)malloc( sizeof( vlc_list_t ) );
1411     if( p_list == NULL )
1412     {
1413         return NULL;
1414     }
1415
1416     p_list->i_count = i_count;
1417
1418     if( i_count == 0 )
1419     {
1420         p_list->p_values = NULL;
1421         return p_list;
1422     }
1423
1424     p_list->p_values = malloc( i_count * sizeof( vlc_value_t ) );
1425     if( p_list->p_values == NULL )
1426     {
1427         p_list->i_count = 0;
1428         return p_list;
1429     }
1430
1431     return p_list;
1432 }
1433
1434 static void ListReplace( vlc_list_t *p_list, vlc_object_t *p_object,
1435                          int i_index )
1436 {
1437     if( p_list == NULL || i_index >= p_list->i_count )
1438     {
1439         return;
1440     }
1441
1442     p_object->p_internals->i_refcount++;
1443
1444     p_list->p_values[i_index].p_object = p_object;
1445
1446     return;
1447 }
1448
1449 /*static void ListAppend( vlc_list_t *p_list, vlc_object_t *p_object )
1450 {
1451     if( p_list == NULL )
1452     {
1453         return;
1454     }
1455
1456     p_list->p_values = realloc( p_list->p_values, (p_list->i_count + 1)
1457                                 * sizeof( vlc_value_t ) );
1458     if( p_list->p_values == NULL )
1459     {
1460         p_list->i_count = 0;
1461         return;
1462     }
1463
1464     p_object->p_internals->i_refcount++;
1465
1466     p_list->p_values[p_list->i_count].p_object = p_object;
1467     p_list->i_count++;
1468
1469     return;
1470 }*/
1471
1472 static int CountChildren( vlc_object_t *p_this, int i_type )
1473 {
1474     vlc_object_t *p_tmp;
1475     int i, i_count = 0;
1476
1477     for( i = 0; i < p_this->i_children; i++ )
1478     {
1479         p_tmp = p_this->pp_children[i];
1480
1481         if( p_tmp->i_object_type == i_type )
1482         {
1483             i_count++;
1484         }
1485
1486         if( p_tmp->i_children )
1487         {
1488             i_count += CountChildren( p_tmp, i_type );
1489         }
1490     }
1491
1492     return i_count;
1493 }
1494
1495 static void ListChildren( vlc_list_t *p_list, vlc_object_t *p_this, int i_type )
1496 {
1497     vlc_object_t *p_tmp;
1498     int i;
1499
1500     for( i = 0; i < p_this->i_children; i++ )
1501     {
1502         p_tmp = p_this->pp_children[i];
1503
1504         if( p_tmp->i_object_type == i_type )
1505         {
1506             ListReplace( p_list, p_tmp, p_list->i_count++ );
1507         }
1508
1509         if( p_tmp->i_children )
1510         {
1511             ListChildren( p_list, p_tmp, i_type );
1512         }
1513     }
1514 }