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     {
 520         if( read( fd, &(char){ 0 }, 1 ) == 0 )
 521         {
 522             close( fd );
 523             obj->p_internals->pipes[1] = -1;
 524         }
 525         return obj->b_die;
 526     }
 527
 528     vlc_cond_wait( &obj->object_wait, &obj->object_lock );
 529     return obj->b_die;
 530 }
 531
 532
 533 /**
 534  * Waits for the object to be signaled (using vlc_object_signal()), or for
 535  * a timer to expire.
 536  * If the object already has a signal pending, this function will return
 537  * immediately. It is asserted that the caller holds the object lock.
 538  *
 539  * @return negative if the object is dying and should terminate,
 540  * positive if the the object has been signaled but is not dying,
 541  * 0 if timeout has been reached.
 542  */
 543 int __vlc_object_timedwait( vlc_object_t *obj, mtime_t deadline )
 544 {
 545     int v;
 546
 547     vlc_assert_locked( &obj->object_lock );
 548     v = vlc_cond_timedwait( &obj->object_wait, &obj->object_lock, deadline );
 549     if( v == 0 ) /* signaled */
 550         return obj->b_die ? -1 : 1;
 551     return 0;
 552 }
 553
 554
 555 /**
 556  * Checks whether an object has been "killed".
 557  * The object lock must be held.
 558  *
 559  * Typical code for an object thread could be:
 560  *
 561    vlc_object_lock (self);
 562    ...initialization...
 563    while (vlc_object_alive (self))
 564    {
 565        ...preprocessing...
 566
 567        if (vlc_object_wait (self))
 568            continue;
 569
 570        ...postprocessing...
 571    }
 572    ...deinitialization...
 573    vlc_object_unlock (self);
 574  *
 575  *
 576  * @return true iff the object has not been killed yet
 577  */
 578 vlc_bool_t __vlc_object_alive( vlc_object_t *obj )
 579 {
 580     vlc_assert_locked( &obj->object_lock );
 581     return !obj->b_die;
 582 }
 583
 584
 585 /**
 586  * Signals an object for which the lock is held.
 587  */
 588 void __vlc_object_signal_unlocked( vlc_object_t *obj )
 589 {
 590     vlc_assert_locked( &obj->object_lock );
 591
 592     int fd = obj->p_internals->pipes[1];
 593     if( fd != -1 )
 594         while( write( fd, &(char){ 0 }, 1 ) < 0 );
 595
 596     vlc_cond_signal( &obj->object_wait );
 597 }
 598
 599
 600 /**
 601  * Requests termination of an object.
 602  * If the object is LibVLC, also request to terminate all its children.
 603  */
 604 void __vlc_object_kill( vlc_object_t *p_this )
 605 {
 606     vlc_mutex_lock( &p_this->object_lock );
 607     p_this->b_die = VLC_TRUE;
 608
 609     if( p_this->i_object_type == VLC_OBJECT_LIBVLC )
 610         for( int i = 0; i < p_this->i_children ; i++ )
 611             vlc_object_kill( p_this->pp_children[i] );
 612
 613     int fd = p_this->p_internals->pipes[1];
 614     if( fd != -1 )
 615     {
 616         close( fd ); /* closing a pipe makes it readable too */
 617         p_this->p_internals->pipes[1] = -1;
 618     }
 619
 620     vlc_object_signal_unlocked( p_this );
 621     vlc_mutex_unlock( &p_this->object_lock );
 622 }
 623
 624
 625 /**
 626  * find an object given its ID
 627  *
 628  * This function looks for the object whose i_object_id field is i_id. We
 629  * use a dichotomy so that lookups are in log2(n).
 630  *****************************************************************************/
 631 void * __vlc_object_get( vlc_object_t *p_this, int i_id )
 632 {
 633     int i_max, i_middle;
 634     vlc_object_t **pp_objects;
 635     libvlc_global_data_t *p_libvlc_global = vlc_global();
 636
 637     vlc_mutex_lock( &structure_lock );
 638
 639     pp_objects = p_libvlc_global->pp_objects;
 640
 641     /* Perform our dichotomy */
 642     for( i_max = p_libvlc_global->i_objects - 1 ; ; )
 643     {
 644         i_middle = i_max / 2;
 645
 646         if( pp_objects[i_middle]->i_object_id > i_id )
 647         {
 648             i_max = i_middle;
 649         }
 650         else if( pp_objects[i_middle]->i_object_id < i_id )
 651         {
 652             if( i_middle )
 653             {
 654                 pp_objects += i_middle;
 655                 i_max -= i_middle;
 656             }
 657             else
 658             {
 659                 /* This happens when there are only two remaining objects */
 660                 if( pp_objects[i_middle+1]->i_object_id == i_id )
 661                 {
 662                     vlc_mutex_unlock( &structure_lock );
 663                     pp_objects[i_middle+1]->p_internals->i_refcount++;
 664                     return pp_objects[i_middle+1];
 665                 }
 666                 break;
 667             }
 668         }
 669         else
 670         {
 671             vlc_mutex_unlock( &structure_lock );
 672             pp_objects[i_middle]->p_internals->i_refcount++;
 673             return pp_objects[i_middle];
 674         }
 675
 676         if( i_max == 0 )
 677         {
 678             /* this means that i_max == i_middle, and since we have already
 679              * tested pp_objects[i_middle]), p_found is properly set. */
 680             break;
 681         }
 682     }
 683
 684     vlc_mutex_unlock( &structure_lock );
 685     return NULL;
 686 }
 687
 688 /**
 689  ****************************************************************************
 690  * find a typed object and increment its refcount
 691  *****************************************************************************
 692  * This function recursively looks for a given object type. i_mode can be one
 693  * of FIND_PARENT, FIND_CHILD or FIND_ANYWHERE.
 694  *****************************************************************************/
 695 void * __vlc_object_find( vlc_object_t *p_this, int i_type, int i_mode )
 696 {
 697     vlc_object_t *p_found;
 698
 699     vlc_mutex_lock( &structure_lock );
 700
 701     /* If we are of the requested type ourselves, don't look further */
 702     if( !(i_mode & FIND_STRICT) && p_this->i_object_type == i_type )
 703     {
 704         p_this->p_internals->i_refcount++;
 705         vlc_mutex_unlock( &structure_lock );
 706         return p_this;
 707     }
 708
 709     /* Otherwise, recursively look for the object */
 710     if( (i_mode & 0x000f) == FIND_ANYWHERE )
 711     {
 712         vlc_object_t *p_root = p_this;
 713
 714         /* Find the root */
 715         while( p_root->p_parent != NULL &&
 716                p_root != VLC_OBJECT( p_this->p_libvlc ) )
 717         {
 718             p_root = p_root->p_parent;
 719         }
 720
 721         p_found = FindObject( p_root, i_type, (i_mode & ~0x000f)|FIND_CHILD );
 722         if( p_found == NULL && p_root != VLC_OBJECT( p_this->p_libvlc ) )
 723         {
 724             p_found = FindObject( VLC_OBJECT( p_this->p_libvlc ),
 725                                   i_type, (i_mode & ~0x000f)|FIND_CHILD );
 726         }
 727     }
 728     else
 729     {
 730         p_found = FindObject( p_this, i_type, i_mode );
 731     }
 732
 733     vlc_mutex_unlock( &structure_lock );
 734
 735     return p_found;
 736 }
 737
 738 /**
 739  ****************************************************************************
 740  * find a named object and increment its refcount
 741  *****************************************************************************
 742  * This function recursively looks for a given object name. i_mode can be one
 743  * of FIND_PARENT, FIND_CHILD or FIND_ANYWHERE.
 744  *****************************************************************************/
 745 void * __vlc_object_find_name( vlc_object_t *p_this, const char *psz_name,
 746                                int i_mode )
 747 {
 748     vlc_object_t *p_found;
 749
 750     vlc_mutex_lock( &structure_lock );
 751
 752     /* If have the requested name ourselves, don't look further */
 753     if( !(i_mode & FIND_STRICT)
 754         && p_this->psz_object_name
 755         && !strcmp( p_this->psz_object_name, psz_name ) )
 756     {
 757         p_this->p_internals->i_refcount++;
 758         vlc_mutex_unlock( &structure_lock );
 759         return p_this;
 760     }
 761
 762     /* Otherwise, recursively look for the object */
 763     if( (i_mode & 0x000f) == FIND_ANYWHERE )
 764     {
 765         vlc_object_t *p_root = p_this;
 766
 767         /* Find the root */
 768         while( p_root->p_parent != NULL &&
 769                p_root != VLC_OBJECT( p_this->p_libvlc ) )
 770         {
 771             p_root = p_root->p_parent;
 772         }
 773
 774         p_found = FindObjectName( p_root, psz_name,
 775                                  (i_mode & ~0x000f)|FIND_CHILD );
 776         if( p_found == NULL && p_root != VLC_OBJECT( p_this->p_libvlc ) )
 777         {
 778             p_found = FindObjectName( VLC_OBJECT( p_this->p_libvlc ),
 779                                       psz_name, (i_mode & ~0x000f)|FIND_CHILD );
 780         }
 781     }
 782     else
 783     {
 784         p_found = FindObjectName( p_this, psz_name, i_mode );
 785     }
 786
 787     vlc_mutex_unlock( &structure_lock );
 788
 789     return p_found;
 790 }
 791
 792 /**
 793  ****************************************************************************
 794  * increment an object refcount
 795  *****************************************************************************/
 796 void __vlc_object_yield( vlc_object_t *p_this )
 797 {
 798     vlc_mutex_lock( &structure_lock );
 799     p_this->p_internals->i_refcount++;
 800     vlc_mutex_unlock( &structure_lock );
 801 }
 802
 803 static inline void Release( vlc_object_t *obj )
 804 {
 805     assert( obj->p_internals->i_refcount > 0 );
 806     obj->p_internals->i_refcount--;
 807 }
 808
 809 /*****************************************************************************
 810  * decrement an object refcount
 811  *****************************************************************************/
 812 void __vlc_object_release( vlc_object_t *p_this )
 813 {
 814     vlc_mutex_lock( &structure_lock );
 815     Release( p_this );
 816     vlc_mutex_unlock( &structure_lock );
 817 }
 818
 819 /**
 820  ****************************************************************************
 821  * attach object to a parent object
 822  *****************************************************************************
 823  * This function sets p_this as a child of p_parent, and p_parent as a parent
 824  * of p_this. This link can be undone using vlc_object_detach.
 825  *****************************************************************************/
 826 void __vlc_object_attach( vlc_object_t *p_this, vlc_object_t *p_parent )
 827 {
 828     if( !p_this ) return;
 829
 830     vlc_mutex_lock( &structure_lock );
 831
 832     /* Attach the parent to its child */
 833     p_this->p_parent = p_parent;
 834
 835     /* Attach the child to its parent */
 836     INSERT_ELEM( p_parent->pp_children, p_parent->i_children,
 837                  p_parent->i_children, p_this );
 838
 839     /* Climb up the tree to see whether we are connected with the root */
 840     if( p_parent->p_internals->b_attached )
 841     {
 842         SetAttachment( p_this, VLC_TRUE );
 843     }
 844
 845     vlc_mutex_unlock( &structure_lock );
 846 }
 847
 848 /**
 849  ****************************************************************************
 850  * detach object from its parent
 851  *****************************************************************************
 852  * This function removes all links between an object and its parent.
 853  *****************************************************************************/
 854 void __vlc_object_detach( vlc_object_t *p_this )
 855 {
 856     if( !p_this ) return;
 857
 858     vlc_mutex_lock( &structure_lock );
 859     if( !p_this->p_parent )
 860     {
 861         msg_Err( p_this, "object is not attached" );
 862         vlc_mutex_unlock( &structure_lock );
 863         return;
 864     }
 865
 866     /* Climb up the tree to see whether we are connected with the root */
 867     if( p_this->p_parent->p_internals->b_attached )
 868     {
 869         SetAttachment( p_this, VLC_FALSE );
 870     }
 871
 872     DetachObject( p_this );
 873     vlc_mutex_unlock( &structure_lock );
 874     p_this = NULL;
 875 }
 876
 877 /**
 878  ****************************************************************************
 879  * find a list typed objects and increment their refcount
 880  *****************************************************************************
 881  * This function recursively looks for a given object type. i_mode can be one
 882  * of FIND_PARENT, FIND_CHILD or FIND_ANYWHERE.
 883  *****************************************************************************/
 884 vlc_list_t * __vlc_list_find( vlc_object_t *p_this, int i_type, int i_mode )
 885 {
 886     vlc_list_t *p_list;
 887     vlc_object_t **pp_current, **pp_end;
 888     int i_count = 0, i_index = 0;
 889     libvlc_global_data_t *p_libvlc_global = vlc_global();
 890
 891     vlc_mutex_lock( &structure_lock );
 892
 893     /* Look for the objects */
 894     switch( i_mode & 0x000f )
 895     {
 896     case FIND_ANYWHERE:
 897         pp_current = p_libvlc_global->pp_objects;
 898         pp_end = pp_current + p_libvlc_global->i_objects;
 899
 900         for( ; pp_current < pp_end ; pp_current++ )
 901         {
 902             if( (*pp_current)->p_internals->b_attached
 903                  && (*pp_current)->i_object_type == i_type )
 904             {
 905                 i_count++;
 906             }
 907         }
 908
 909         p_list = NewList( i_count );
 910         pp_current = p_libvlc_global->pp_objects;
 911
 912         for( ; pp_current < pp_end ; pp_current++ )
 913         {
 914             if( (*pp_current)->p_internals->b_attached
 915                  && (*pp_current)->i_object_type == i_type )
 916             {
 917                 ListReplace( p_list, *pp_current, i_index );
 918                 if( i_index < i_count ) i_index++;
 919             }
 920         }
 921     break;
 922
 923     case FIND_CHILD:
 924         i_count = CountChildren( p_this, i_type );
 925         p_list = NewList( i_count );
 926
 927         /* Check allocation was successful */
 928         if( p_list->i_count != i_count )
 929         {
 930             msg_Err( p_this, "list allocation failed!" );
 931             p_list->i_count = 0;
 932             break;
 933         }
 934
 935         p_list->i_count = 0;
 936         ListChildren( p_list, p_this, i_type );
 937         break;
 938
 939     default:
 940         msg_Err( p_this, "unimplemented!" );
 941         p_list = NewList( 0 );
 942         break;
 943     }
 944
 945     vlc_mutex_unlock( &structure_lock );
 946
 947     return p_list;
 948 }
 949
 950 /*****************************************************************************
 951  * DumpCommand: print the current vlc structure
 952  *****************************************************************************
 953  * This function prints either an ASCII tree showing the connections between
 954  * vlc objects, and additional information such as their refcount, thread ID,
 955  * etc. (command "tree"), or the same data as a simple list (command "list").
 956  *****************************************************************************/
 957 static int DumpCommand( vlc_object_t *p_this, char const *psz_cmd,
 958                         vlc_value_t oldval, vlc_value_t newval, void *p_data )
 959 {
 960     libvlc_global_data_t *p_libvlc_global = vlc_global();
 961
 962     (void)oldval; (void)p_data;
 963     if( *psz_cmd == 'l' )
 964     {
 965         vlc_mutex_lock( &structure_lock );
 966
 967         vlc_object_t **pp_current, **pp_end;
 968
 969         pp_current = p_libvlc_global->pp_objects;
 970         pp_end = pp_current + p_libvlc_global->i_objects;
 971
 972         for( ; pp_current < pp_end ; pp_current++ )
 973         {
 974             if( (*pp_current)->p_internals->b_attached )
 975             {
 976                 PrintObject( *pp_current, "" );
 977             }
 978             else
 979             {
 980                 printf( " o %.8i %s (not attached)\n",
 981                         (*pp_current)->i_object_id,
 982                         (*pp_current)->psz_object_type );
 983             }
 984         }
 985
 986         vlc_mutex_unlock( &structure_lock );
 987     }
 988     else
 989     {
 990         vlc_object_t *p_object = NULL;
 991
 992         if( *newval.psz_string )
 993         {
 994             char *end;
 995             int i_id = strtol( newval.psz_string, &end, 0 );
 996             if( end != newval.psz_string )
 997                 p_object = vlc_object_get( p_this, i_id );
 998             else
 999             {
1000                 /* try using the object's name to find it */
1001                 vlc_object_t *p_libvlc = vlc_object_get( p_this, 1 );
1002                 if( p_libvlc )
1003                 {
1004                     /* Look in p_libvlc's children tree */
1005                     p_object = vlc_object_find_name( p_libvlc,
1006                                                      newval.psz_string,
1007                                                      FIND_CHILD );
1008                     vlc_object_release( p_libvlc );
1009                 }
1010                 if( !p_object )
1011                 {
1012                     /* If it's not in libvlc, look in libvlc_global (== p_this) */
1013                     p_object = vlc_object_find_name( p_this,
1014                                                      newval.psz_string,
1015                                                      FIND_CHILD );
1016                 }
1017             }
1018
1019             if( !p_object )
1020             {
1021                 return VLC_ENOOBJ;
1022             }
1023         }
1024
1025         vlc_mutex_lock( &structure_lock );
1026
1027         if( *psz_cmd == 't' )
1028         {
1029             char psz_foo[2 * MAX_DUMPSTRUCTURE_DEPTH + 1];
1030
1031             if( !p_object )
1032                 p_object = p_this->p_libvlc ? VLC_OBJECT(p_this->p_libvlc) : p_this;
1033
1034             psz_foo[0] = '|';
1035             DumpStructure( p_object, 0, psz_foo );
1036         }
1037         else if( *psz_cmd == 'v' )
1038         {
1039             int i;
1040
1041             if( !p_object )
1042                 p_object = p_this->p_libvlc ? VLC_OBJECT(p_this->p_libvlc) : p_this;
1043
1044             PrintObject( p_object, "" );
1045
1046             if( !p_object->p_internals->i_vars )
1047                 printf( " `-o No variables\n" );
1048             for( i = 0; i < p_object->p_internals->i_vars; i++ )
1049             {
1050                 variable_t *p_var = p_object->p_internals->p_vars + i;
1051
1052                 const char *psz_type = "unknown";
1053                 switch( p_var->i_type & VLC_VAR_TYPE )
1054                 {
1055 #define MYCASE( type, nice )                \
1056                     case VLC_VAR_ ## type:  \
1057                         psz_type = nice;    \
1058                         break;
1059                     MYCASE( VOID, "void" );
1060                     MYCASE( BOOL, "bool" );
1061                     MYCASE( INTEGER, "integer" );
1062                     MYCASE( HOTKEY, "hotkey" );
1063                     MYCASE( STRING, "string" );
1064                     MYCASE( MODULE, "module" );
1065                     MYCASE( FILE, "file" );
1066                     MYCASE( DIRECTORY, "directory" );
1067                     MYCASE( VARIABLE, "variable" );
1068                     MYCASE( FLOAT, "float" );
1069                     MYCASE( TIME, "time" );
1070                     MYCASE( ADDRESS, "address" );
1071                     MYCASE( MUTEX, "mutex" );
1072                     MYCASE( LIST, "list" );
1073 #undef MYCASE
1074                 }
1075                 printf( " %c-o \"%s\" (%s",
1076                         i + 1 == p_object->p_internals->i_vars ? '`' : '|',
1077                         p_var->psz_name, psz_type );
1078                 if( p_var->psz_text )
1079                     printf( ", %s", p_var->psz_text );
1080                 printf( ")" );
1081                 if( p_var->i_type & VLC_VAR_ISCOMMAND )
1082                     printf( ", command" );
1083                 if( p_var->i_entries )
1084                     printf( ", %d callbacks", p_var->i_entries );
1085                 switch( p_var->i_type & 0x00f0 )
1086                 {
1087                     case VLC_VAR_VOID:
1088                     case VLC_VAR_MUTEX:
1089                         break;
1090                     case VLC_VAR_BOOL:
1091                         printf( ": %s", p_var->val.b_bool ? "true" : "false" );
1092                         break;
1093                     case VLC_VAR_INTEGER:
1094                         printf( ": %d", p_var->val.i_int );
1095                         break;
1096                     case VLC_VAR_STRING:
1097                         printf( ": \"%s\"", p_var->val.psz_string );
1098                         break;
1099                     case VLC_VAR_FLOAT:
1100                         printf( ": %f", p_var->val.f_float );
1101                         break;
1102                     case VLC_VAR_TIME:
1103                         printf( ": " I64Fi, (int64_t)p_var->val.i_time );
1104                         break;
1105                     case VLC_VAR_ADDRESS:
1106                         printf( ": %p", p_var->val.p_address );
1107                         break;
1108                     case VLC_VAR_LIST:
1109                         printf( ": TODO" );
1110                         break;
1111                 }
1112                 printf( "\n" );
1113             }
1114         }
1115
1116         vlc_mutex_unlock( &structure_lock );
1117
1118         if( *newval.psz_string )
1119         {
1120             vlc_object_release( p_object );
1121         }
1122     }
1123
1124     return VLC_SUCCESS;
1125 }
1126
1127 /*****************************************************************************
1128  * vlc_list_release: free a list previously allocated by vlc_list_find
1129  *****************************************************************************
1130  * This function decreases the refcount of all objects in the list and
1131  * frees the list.
1132  *****************************************************************************/
1133 void vlc_list_release( vlc_list_t *p_list )
1134 {
1135     int i_index;
1136
1137     vlc_mutex_lock( &structure_lock );
1138     for( i_index = 0; i_index < p_list->i_count; i_index++ )
1139     {
1140         Release( p_list->p_values[i_index].p_object );
1141     }
1142     vlc_mutex_unlock( &structure_lock );
1143
1144     free( p_list->p_values );
1145     free( p_list );
1146 }
1147
1148 /* Following functions are local */
1149
1150 /*****************************************************************************
1151  * FindIndex: find the index of an object in an array of objects
1152  *****************************************************************************
1153  * This function assumes that p_this can be found in pp_objects. It will not
1154  * crash if p_this cannot be found, but will return a wrong value. It is your
1155  * duty to check the return value if you are not certain that the object could
1156  * be found for sure.
1157  *****************************************************************************/
1158 static int FindIndex( vlc_object_t *p_this,
1159                       vlc_object_t **pp_objects, int i_count )
1160 {
1161     int i_middle = i_count / 2;
1162
1163     if( i_count == 0 )
1164     {
1165         return 0;
1166     }
1167
1168     if( pp_objects[i_middle] == p_this )
1169     {
1170         return i_middle;
1171     }
1172
1173     if( i_count == 1 )
1174     {
1175         return 0;
1176     }
1177
1178     /* We take advantage of the sorted array */
1179     if( pp_objects[i_middle]->i_object_id < p_this->i_object_id )
1180     {
1181         return i_middle + FindIndex( p_this, pp_objects + i_middle,
1182                                              i_count - i_middle );
1183     }
1184     else
1185     {
1186         return FindIndex( p_this, pp_objects, i_middle );
1187     }
1188 }
1189
1190 static vlc_object_t * FindObject( vlc_object_t *p_this, int i_type, int i_mode )
1191 {
1192     int i;
1193     vlc_object_t *p_tmp;
1194
1195     switch( i_mode & 0x000f )
1196     {
1197     case FIND_PARENT:
1198         p_tmp = p_this->p_parent;
1199         if( p_tmp )
1200         {
1201             if( p_tmp->i_object_type == i_type )
1202             {
1203                 p_tmp->p_internals->i_refcount++;
1204                 return p_tmp;
1205             }
1206             else
1207             {
1208                 return FindObject( p_tmp, i_type, i_mode );
1209             }
1210         }
1211         break;
1212
1213     case FIND_CHILD:
1214         for( i = p_this->i_children; i--; )
1215         {
1216             p_tmp = p_this->pp_children[i];
1217             if( p_tmp->i_object_type == i_type )
1218             {
1219                 p_tmp->p_internals->i_refcount++;
1220                 return p_tmp;
1221             }
1222             else if( p_tmp->i_children )
1223             {
1224                 p_tmp = FindObject( p_tmp, i_type, i_mode );
1225                 if( p_tmp )
1226                 {
1227                     return p_tmp;
1228                 }
1229             }
1230         }
1231         break;
1232
1233     case FIND_ANYWHERE:
1234         /* Handled in vlc_object_find */
1235         break;
1236     }
1237
1238     return NULL;
1239 }
1240
1241 static vlc_object_t * FindObjectName( vlc_object_t *p_this,
1242                                       const char *psz_name,
1243                                       int i_mode )
1244 {
1245     int i;
1246     vlc_object_t *p_tmp;
1247
1248     switch( i_mode & 0x000f )
1249     {
1250     case FIND_PARENT:
1251         p_tmp = p_this->p_parent;
1252         if( p_tmp )
1253         {
1254             if( p_tmp->psz_object_name
1255                 && !strcmp( p_tmp->psz_object_name, psz_name ) )
1256             {
1257                 p_tmp->p_internals->i_refcount++;
1258                 return p_tmp;
1259             }
1260             else
1261             {
1262                 return FindObjectName( p_tmp, psz_name, i_mode );
1263             }
1264         }
1265         break;
1266
1267     case FIND_CHILD:
1268         for( i = p_this->i_children; i--; )
1269         {
1270             p_tmp = p_this->pp_children[i];
1271             if( p_tmp->psz_object_name
1272                 && !strcmp( p_tmp->psz_object_name, psz_name ) )
1273             {
1274                 p_tmp->p_internals->i_refcount++;
1275                 return p_tmp;
1276             }
1277             else if( p_tmp->i_children )
1278             {
1279                 p_tmp = FindObjectName( p_tmp, psz_name, i_mode );
1280                 if( p_tmp )
1281                 {
1282                     return p_tmp;
1283                 }
1284             }
1285         }
1286         break;
1287
1288     case FIND_ANYWHERE:
1289         /* Handled in vlc_object_find */
1290         break;
1291     }
1292
1293     return NULL;
1294 }
1295
1296 static void DetachObject( vlc_object_t *p_this )
1297 {
1298     vlc_object_t *p_parent = p_this->p_parent;
1299     int i_index, i;
1300
1301     /* Remove p_this's parent */
1302     p_this->p_parent = NULL;
1303
1304     /* Remove all of p_parent's children which are p_this */
1305     for( i_index = p_parent->i_children ; i_index-- ; )
1306     {
1307         if( p_parent->pp_children[i_index] == p_this )
1308         {
1309             p_parent->i_children--;
1310             for( i = i_index ; i < p_parent->i_children ; i++ )
1311             {
1312                 p_parent->pp_children[i] = p_parent->pp_children[i+1];
1313             }
1314         }
1315     }
1316
1317     if( p_parent->i_children )
1318     {
1319         p_parent->pp_children = (vlc_object_t **)realloc( p_parent->pp_children,
1320                                p_parent->i_children * sizeof(vlc_object_t *) );
1321     }
1322     else
1323     {
1324         free( p_parent->pp_children );
1325         p_parent->pp_children = NULL;
1326     }
1327 }
1328
1329 /*****************************************************************************
1330  * SetAttachment: recursively set the b_attached flag of a subtree.
1331  *****************************************************************************
1332  * This function is used by the attach and detach functions to propagate
1333  * the b_attached flag in a subtree.
1334  *****************************************************************************/
1335 static void SetAttachment( vlc_object_t *p_this, vlc_bool_t b_attached )
1336 {
1337     int i_index;
1338
1339     for( i_index = p_this->i_children ; i_index-- ; )
1340     {
1341         SetAttachment( p_this->pp_children[i_index], b_attached );
1342     }
1343
1344     p_this->p_internals->b_attached = b_attached;
1345 }
1346
1347 static void PrintObject( vlc_object_t *p_this, const char *psz_prefix )
1348 {
1349     char psz_children[20], psz_refcount[20], psz_thread[30], psz_name[50],
1350          psz_parent[20];
1351
1352     psz_name[0] = '\0';
1353     if( p_this->psz_object_name )
1354     {
1355         snprintf( psz_name, 49, " \"%s\"", p_this->psz_object_name );
1356         if( psz_name[48] )
1357             psz_name[48] = '\"';
1358     }
1359
1360     psz_children[0] = '\0';
1361     switch( p_this->i_children )
1362     {
1363         case 0:
1364             break;
1365         case 1:
1366             strcpy( psz_children, ", 1 child" );
1367             break;
1368         default:
1369             snprintf( psz_children, 19, ", %i children", p_this->i_children );
1370             break;
1371     }
1372
1373     psz_refcount[0] = '\0';
1374     if( p_this->p_internals->i_refcount > 0 )
1375         snprintf( psz_refcount, 19, ", refcount %u",
1376                   p_this->p_internals->i_refcount );
1377
1378     psz_thread[0] = '\0';
1379     if( p_this->p_internals->b_thread )
1380         snprintf( psz_thread, 29, " (thread %u)",
1381 #if defined(WIN32) || defined(UNDER_CE)
1382                   (unsigned)p_this->p_internals->thread_id.id );
1383 #else
1384                   (unsigned)p_this->p_internals->thread_id );
1385 #endif
1386
1387     psz_parent[0] = '\0';
1388     if( p_this->p_parent )
1389         snprintf( psz_parent, 19, ", parent %i", p_this->p_parent->i_object_id );
1390
1391     printf( " %so %.8i %s%s%s%s%s%s\n", psz_prefix,
1392             p_this->i_object_id, p_this->psz_object_type,
1393             psz_name, psz_thread, psz_refcount, psz_children,
1394             psz_parent );
1395 }
1396
1397 static void DumpStructure( vlc_object_t *p_this, int i_level, char *psz_foo )
1398 {
1399     int i;
1400     char i_back = psz_foo[i_level];
1401     psz_foo[i_level] = '\0';
1402
1403     PrintObject( p_this, psz_foo );
1404
1405     psz_foo[i_level] = i_back;
1406
1407     if( i_level / 2 >= MAX_DUMPSTRUCTURE_DEPTH )
1408     {
1409         msg_Warn( p_this, "structure tree is too deep" );
1410         return;
1411     }
1412
1413     for( i = 0 ; i < p_this->i_children ; i++ )
1414     {
1415         if( i_level )
1416         {
1417             psz_foo[i_level-1] = ' ';
1418
1419             if( psz_foo[i_level-2] == '`' )
1420             {
1421                 psz_foo[i_level-2] = ' ';
1422             }
1423         }
1424
1425         if( i == p_this->i_children - 1 )
1426         {
1427             psz_foo[i_level] = '`';
1428         }
1429         else
1430         {
1431             psz_foo[i_level] = '|';
1432         }
1433
1434         psz_foo[i_level+1] = '-';
1435         psz_foo[i_level+2] = '\0';
1436
1437         DumpStructure( p_this->pp_children[i], i_level + 2, psz_foo );
1438     }
1439 }
1440
1441 static vlc_list_t * NewList( int i_count )
1442 {
1443     vlc_list_t * p_list = (vlc_list_t *)malloc( sizeof( vlc_list_t ) );
1444     if( p_list == NULL )
1445     {
1446         return NULL;
1447     }
1448
1449     p_list->i_count = i_count;
1450
1451     if( i_count == 0 )
1452     {
1453         p_list->p_values = NULL;
1454         return p_list;
1455     }
1456
1457     p_list->p_values = malloc( i_count * sizeof( vlc_value_t ) );
1458     if( p_list->p_values == NULL )
1459     {
1460         p_list->i_count = 0;
1461         return p_list;
1462     }
1463
1464     return p_list;
1465 }
1466
1467 static void ListReplace( vlc_list_t *p_list, vlc_object_t *p_object,
1468                          int i_index )
1469 {
1470     if( p_list == NULL || i_index >= p_list->i_count )
1471     {
1472         return;
1473     }
1474
1475     p_object->p_internals->i_refcount++;
1476
1477     p_list->p_values[i_index].p_object = p_object;
1478
1479     return;
1480 }
1481
1482 /*static void ListAppend( vlc_list_t *p_list, vlc_object_t *p_object )
1483 {
1484     if( p_list == NULL )
1485     {
1486         return;
1487     }
1488
1489     p_list->p_values = realloc( p_list->p_values, (p_list->i_count + 1)
1490                                 * sizeof( vlc_value_t ) );
1491     if( p_list->p_values == NULL )
1492     {
1493         p_list->i_count = 0;
1494         return;
1495     }
1496
1497     p_object->p_internals->i_refcount++;
1498
1499     p_list->p_values[p_list->i_count].p_object = p_object;
1500     p_list->i_count++;
1501
1502     return;
1503 }*/
1504
1505 static int CountChildren( vlc_object_t *p_this, int i_type )
1506 {
1507     vlc_object_t *p_tmp;
1508     int i, i_count = 0;
1509
1510     for( i = 0; i < p_this->i_children; i++ )
1511     {
1512         p_tmp = p_this->pp_children[i];
1513
1514         if( p_tmp->i_object_type == i_type )
1515         {
1516             i_count++;
1517         }
1518
1519         if( p_tmp->i_children )
1520         {
1521             i_count += CountChildren( p_tmp, i_type );
1522         }
1523     }
1524
1525     return i_count;
1526 }
1527
1528 static void ListChildren( vlc_list_t *p_list, vlc_object_t *p_this, int i_type )
1529 {
1530     vlc_object_t *p_tmp;
1531     int i;
1532
1533     for( i = 0; i < p_this->i_children; i++ )
1534     {
1535         p_tmp = p_this->pp_children[i];
1536
1537         if( p_tmp->i_object_type == i_type )
1538         {
1539             ListReplace( p_list, p_tmp, p_list->i_count++ );
1540         }
1541
1542         if( p_tmp->i_children )
1543         {
1544             ListChildren( p_list, p_tmp, i_type );
1545         }
1546     }
1547 }