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

   1 /*****************************************************************************
   2  * objects.c: vlc_object_t handling
   3  *****************************************************************************
   4  * Copyright (C) 2004-2008 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 #ifdef HAVE_CONFIG_H
  34 # include "config.h"
  35 #endif
  36
  37 #include <vlc/vlc.h>
  38
  39 #include "../libvlc.h"
  40 #include <vlc_vout.h>
  41 #include <vlc_aout.h>
  42 #include "audio_output/aout_internal.h"
  43
  44 #include <vlc_access.h>
  45 #include <vlc_demux.h>
  46 #include <vlc_stream.h>
  47
  48 #include <vlc_sout.h>
  49 #include "stream_output/stream_output.h"
  50
  51 #include "vlc_interface.h"
  52 #include "vlc_codec.h"
  53 #include "vlc_filter.h"
  54
  55 #include "variables.h"
  56 #ifndef WIN32
  57 # include <unistd.h>
  58 #else
  59 # include <io.h>
  60 # include <fcntl.h>
  61 # include <errno.h> /* ENOSYS */
  62 #endif
  63 #include <assert.h>
  64
  65 /*****************************************************************************
  66  * Constants
  67  *****************************************************************************/
  68
  69 const vlc_destructor_t kVLCDestructor = NULL;
  70
  71 /*****************************************************************************
  72  * Local prototypes
  73  *****************************************************************************/
  74 static int  DumpCommand( vlc_object_t *, char const *,
  75                          vlc_value_t, vlc_value_t, void * );
  76
  77 static vlc_object_t * FindObject    ( vlc_object_t *, int, int );
  78 static vlc_object_t * FindObjectName( vlc_object_t *, const char *, int );
  79 static void           DetachObject  ( vlc_object_t * );
  80 static void           PrintObject   ( vlc_object_t *, const char * );
  81 static void           DumpStructure ( vlc_object_t *, int, char * );
  82 static int            FindIndex     ( vlc_object_t *, vlc_object_t **, int );
  83 static void           SetAttachment ( vlc_object_t *, bool );
  84
  85 static vlc_list_t   * NewList       ( int );
  86 static void           ListReplace   ( vlc_list_t *, vlc_object_t *, int );
  87 /*static void           ListAppend    ( vlc_list_t *, vlc_object_t * );*/
  88 static int            CountChildren ( vlc_object_t *, int );
  89 static void           ListChildren  ( vlc_list_t *, vlc_object_t *, int );
  90
  91 static void vlc_object_destroy( vlc_object_t *p_this );
  92 static void vlc_object_yield_locked( vlc_object_t *p_this );
  93
  94 /*****************************************************************************
  95  * Local structure lock
  96  *****************************************************************************/
  97 static vlc_mutex_t    structure_lock;
  98
  99 void *vlc_custom_create( vlc_object_t *p_this, size_t i_size,
 100                          int i_type, const char *psz_type )
 101 {
 102     vlc_object_t *p_new;
 103     vlc_object_internals_t *p_priv;
 104
 105     /* NOTE:
 106      * VLC objects are laid out as follow:
 107      * - first the LibVLC-private per-object data,
 108      * - then VLC_COMMON members from vlc_object_t,
 109      * - finally, the type-specific data (if any).
 110      *
 111      * This function initializes the LibVLC and common data,
 112      * and zeroes the rest.
 113      */
 114     p_priv = calloc( 1, sizeof( *p_priv ) + i_size );
 115     if( p_priv == NULL )
 116         return NULL;
 117
 118     assert (i_size >= sizeof (vlc_object_t));
 119     p_new = (vlc_object_t *)(p_priv + 1);
 120
 121     p_new->i_object_type = i_type;
 122     p_new->psz_object_type = psz_type;
 123     p_new->psz_object_name = NULL;
 124
 125     p_new->b_die = false;
 126     p_new->b_error = false;
 127     p_new->b_dead = false;
 128     p_priv->b_attached = false;
 129     p_new->b_force = false;
 130
 131     p_new->psz_header = NULL;
 132
 133     if (p_this)
 134         p_new->i_flags = p_this->i_flags
 135             & (OBJECT_FLAGS_NODBG|OBJECT_FLAGS_QUIET|OBJECT_FLAGS_NOINTERACT);
 136
 137     p_priv->p_vars = calloc( sizeof( variable_t ), 16 );
 138
 139     if( !p_priv->p_vars )
 140     {
 141         free( p_priv );
 142         return NULL;
 143     }
 144
 145     libvlc_global_data_t *p_libvlc_global;
 146     if( i_type == VLC_OBJECT_GLOBAL )
 147     {
 148         /* If i_type is global, then p_new is actually p_libvlc_global */
 149         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_libvlc_global->i_objects = 0;
 154         p_libvlc_global->pp_objects = NULL;
 155         p_priv->b_attached = true;
 156         vlc_mutex_init( &structure_lock );
 157     }
 158     else
 159     {
 160         p_libvlc_global = vlc_global();
 161         if( i_type == VLC_OBJECT_LIBVLC )
 162         {
 163             p_new->p_libvlc = (libvlc_int_t*)p_new;
 164             p_priv->b_attached = true;
 165         }
 166         else
 167         {
 168             p_new->p_libvlc = p_this->p_libvlc;
 169         }
 170     }
 171
 172     vlc_mutex_lock( &structure_lock );
 173     p_new->i_object_id = p_libvlc_global->i_counter++;
 174
 175     /* Wooohaa! If *this* fails, we're in serious trouble! Anyway it's
 176      * useless to try and recover anything if pp_objects gets smashed. */
 177     TAB_APPEND( p_libvlc_global->i_objects, p_libvlc_global->pp_objects,
 178                 p_new );
 179     vlc_mutex_unlock( &structure_lock );
 180
 181     p_priv->i_refcount = 1;
 182     p_priv->pf_destructor = kVLCDestructor;
 183     p_priv->b_thread = false;
 184     p_new->p_parent = NULL;
 185     p_new->pp_children = NULL;
 186     p_new->i_children = 0;
 187
 188     p_new->p_private = NULL;
 189
 190     /* Initialize mutexes and condvars */
 191     vlc_mutex_init( &p_new->object_lock );
 192     vlc_cond_init( p_new, &p_new->object_wait );
 193     vlc_mutex_init( &p_priv->var_lock );
 194     vlc_spin_init( &p_priv->spin );
 195     p_priv->pipes[0] = p_priv->pipes[1] = -1;
 196
 197     if( i_type == VLC_OBJECT_LIBVLC )
 198     {
 199         var_Create( p_new, "list", VLC_VAR_STRING | VLC_VAR_ISCOMMAND );
 200         var_AddCallback( p_new, "list", DumpCommand, NULL );
 201         var_Create( p_new, "tree", VLC_VAR_STRING | VLC_VAR_ISCOMMAND );
 202         var_AddCallback( p_new, "tree", DumpCommand, NULL );
 203         var_Create( p_new, "vars", VLC_VAR_STRING | VLC_VAR_ISCOMMAND );
 204         var_AddCallback( p_new, "vars", DumpCommand, NULL );
 205     }
 206
 207     return p_new;
 208 }
 209
 210
 211 /**
 212  * Allocates and initializes a vlc object.
 213  *
 214  * @param i_type known object type (all of them are negative integer values),
 215  *               or object byte size (always positive).
 216  *
 217  * @return the new object, or NULL on error.
 218  */
 219 void * __vlc_object_create( vlc_object_t *p_this, int i_type )
 220 {
 221     const char   * psz_type;
 222     size_t         i_size;
 223
 224     switch( i_type )
 225     {
 226         case VLC_OBJECT_LIBVLC:
 227             i_size = sizeof(libvlc_int_t);
 228             psz_type = "libvlc";
 229             break;
 230         case VLC_OBJECT_INTF:
 231             i_size = sizeof(intf_thread_t);
 232             psz_type = "interface";
 233             break;
 234         case VLC_OBJECT_DIALOGS:
 235             i_size = sizeof(intf_thread_t);
 236             psz_type = "dialogs";
 237             break;
 238         case VLC_OBJECT_DEMUX:
 239             i_size = sizeof(demux_t);
 240             psz_type = "demux";
 241             break;
 242         case VLC_OBJECT_ACCESS:
 243             i_size = sizeof(access_t);
 244             psz_type = "access";
 245             break;
 246         case VLC_OBJECT_DECODER:
 247             i_size = sizeof(decoder_t);
 248             psz_type = "decoder";
 249             break;
 250         case VLC_OBJECT_PACKETIZER:
 251             i_size = sizeof(decoder_t);
 252             psz_type = "packetizer";
 253             break;
 254         case VLC_OBJECT_ENCODER:
 255             i_size = sizeof(encoder_t);
 256             psz_type = "encoder";
 257             break;
 258         case VLC_OBJECT_FILTER:
 259             i_size = sizeof(filter_t);
 260             psz_type = "filter";
 261             break;
 262         case VLC_OBJECT_VOUT:
 263             i_size = sizeof(vout_thread_t);
 264             psz_type = "video output";
 265             break;
 266         case VLC_OBJECT_AOUT:
 267             i_size = sizeof(aout_instance_t);
 268             psz_type = "audio output";
 269             break;
 270         case VLC_OBJECT_SOUT:
 271             i_size = sizeof(sout_instance_t);
 272             psz_type = "stream output";
 273             break;
 274         case VLC_OBJECT_OPENGL:
 275             i_size = sizeof( vout_thread_t );
 276             psz_type = "opengl";
 277             break;
 278         case VLC_OBJECT_ANNOUNCE:
 279             i_size = sizeof( announce_handler_t );
 280             psz_type = "announce";
 281             break;
 282         case VLC_OBJECT_INTERACTION:
 283             i_size = sizeof( interaction_t );
 284             psz_type = "interaction";
 285             break;
 286         default:
 287             i_size = i_type > (int)sizeof(vlc_object_t)
 288                          ? i_type : (int)sizeof(vlc_object_t);
 289             i_type = VLC_OBJECT_GENERIC;
 290             psz_type = "generic";
 291             break;
 292     }
 293
 294     return vlc_custom_create( p_this, i_size, i_type, psz_type );
 295 }
 296
 297
 298 /**
 299  ****************************************************************************
 300  * Set the destructor of a vlc object
 301  *
 302  * This function sets the destructor of the vlc object. It will be called
 303  * when the object is destroyed when the its refcount reaches 0.
 304  * (It is called by the internal function vlc_object_destroy())
 305  *****************************************************************************/
 306 void __vlc_object_set_destructor( vlc_object_t *p_this,
 307                                   vlc_destructor_t pf_destructor )
 308 {
 309     vlc_object_internals_t *p_priv = vlc_internals(p_this );
 310
 311     vlc_mutex_lock( &structure_lock );
 312     p_priv->pf_destructor = pf_destructor;
 313     vlc_mutex_unlock( &structure_lock );
 314 }
 315
 316 /**
 317  ****************************************************************************
 318  * Destroy a vlc object (Internal)
 319  *
 320  * This function destroys an object that has been previously allocated with
 321  * vlc_object_create. The object's refcount must be zero and it must not be
 322  * attached to other objects in any way.
 323  *****************************************************************************/
 324 static void vlc_object_destroy( vlc_object_t *p_this )
 325 {
 326     vlc_object_internals_t *p_priv = vlc_internals( p_this );
 327
 328     /* Automatically detach the object from its parents */
 329     if( p_this->p_parent ) vlc_object_detach( p_this );
 330
 331
 332     /* Send a kill to the object's thread if applicable */
 333     vlc_object_kill( p_this );
 334
 335     /* If we are running on a thread, wait until it ends */
 336     if( p_priv->b_thread )
 337         vlc_thread_join( p_this );
 338
 339     /* Call the custom "subclass" destructor */
 340     if( p_priv->pf_destructor )
 341         p_priv->pf_destructor( p_this );
 342
 343     /* Sanity checks */
 344     if( p_this->i_children )
 345     {
 346         int i;
 347
 348         fprintf( stderr,
 349                  "ERROR: cannot delete object (%i, %s) with %d children\n",
 350                  p_this->i_object_id, p_this->psz_object_name,
 351                  p_this->i_children );
 352
 353         for( i = 0; i < p_this->i_children; i++ )
 354         {
 355             fprintf( stderr,
 356                      "ERROR: Remaining children object "
 357                      "(id:%i, type:%s, name:%s)\n",
 358                      p_this->pp_children[i]->i_object_id,
 359                      p_this->pp_children[i]->psz_object_type,
 360                      p_this->pp_children[i]->psz_object_name );
 361         }
 362         fflush(stderr);
 363
 364         /* Dump libvlc object to ease debugging */
 365         vlc_object_dump( p_this->p_libvlc );
 366
 367         abort();
 368     }
 369
 370     /* Destroy the associated variables, starting from the end so that
 371      * no memmove calls have to be done. */
 372     while( p_priv->i_vars )
 373     {
 374         var_Destroy( p_this, p_priv->p_vars[p_priv->i_vars - 1].psz_name );
 375     }
 376
 377     free( p_priv->p_vars );
 378     vlc_mutex_destroy( &p_priv->var_lock );
 379
 380     free( p_this->psz_header );
 381
 382     if( p_this->i_object_type == VLC_OBJECT_GLOBAL )
 383     {
 384         libvlc_global_data_t *p_global = (libvlc_global_data_t *)p_this;
 385
 386         /* Test for leaks */
 387         if( p_global->i_objects > 0 )
 388         {
 389             int i;
 390             for( i = 0; i < p_global->i_objects; i++ )
 391             {
 392                 /* We are leaking this object */
 393                 fprintf( stderr,
 394                          "ERROR: leaking object (id:%i, type:%s, name:%s)\n",
 395                          p_global->pp_objects[i]->i_object_id,
 396                          p_global->pp_objects[i]->psz_object_type,
 397                          p_global->pp_objects[i]->psz_object_name );
 398
 399                 /* Dump libvlc object to ease debugging */
 400                 vlc_object_dump( p_global->pp_objects[i] );
 401
 402                 fflush(stderr);
 403             }
 404
 405             /* Dump libvlc object to ease debugging */
 406             vlc_object_dump( p_this );
 407
 408             /* Strongly abort, cause we want these to be fixed */
 409             abort();
 410         }
 411
 412         /* We are the global object ... no need to lock. */
 413         free( p_global->pp_objects );
 414         p_global->pp_objects = NULL;
 415
 416         vlc_mutex_destroy( &structure_lock );
 417     }
 418
 419     FREENULL( p_this->psz_object_name );
 420
 421 #if defined(WIN32) || defined(UNDER_CE)
 422     /* if object has an associated thread, close it now */
 423     if( p_priv->thread_id.hThread )
 424        CloseHandle(p_priv->thread_id.hThread);
 425 #endif
 426
 427     vlc_mutex_destroy( &p_this->object_lock );
 428     vlc_cond_destroy( &p_this->object_wait );
 429     vlc_spin_destroy( &p_priv->spin );
 430     if( p_priv->pipes[1] != -1 )
 431         close( p_priv->pipes[1] );
 432     if( p_priv->pipes[0] != -1 )
 433         close( p_priv->pipes[0] );
 434
 435     free( p_priv );
 436 }
 437
 438
 439 /** Inter-object signaling */
 440
 441 void __vlc_object_lock( vlc_object_t *obj )
 442 {
 443     vlc_mutex_lock( &obj->object_lock );
 444 }
 445
 446 void __vlc_object_unlock( vlc_object_t *obj )
 447 {
 448     vlc_assert_locked( &obj->object_lock );
 449     vlc_mutex_unlock( &obj->object_lock );
 450 }
 451
 452 #ifdef WIN32
 453 # include <winsock2.h>
 454 # include <ws2tcpip.h>
 455
 456 /**
 457  * select()-able pipes emulated using Winsock
 458  */
 459 static int pipe (int fd[2])
 460 {
 461     SOCKADDR_IN addr;
 462     int addrlen = sizeof (addr);
 463
 464     SOCKET l = socket (PF_INET, SOCK_STREAM, IPPROTO_TCP), a,
 465            c = socket (PF_INET, SOCK_STREAM, IPPROTO_TCP);
 466     if ((l == INVALID_SOCKET) || (c == INVALID_SOCKET))
 467         goto error;
 468
 469     memset (&addr, 0, sizeof (addr));
 470     addr.sin_family = AF_INET;
 471     addr.sin_addr.s_addr = htonl (INADDR_LOOPBACK);
 472     if (bind (l, (PSOCKADDR)&addr, sizeof (addr))
 473      || getsockname (l, (PSOCKADDR)&addr, &addrlen)
 474      || listen (l, 1)
 475      || connect (c, (PSOCKADDR)&addr, addrlen))
 476         goto error;
 477
 478     a = accept (l, NULL, NULL);
 479     if (a == INVALID_SOCKET)
 480         goto error;
 481
 482     closesocket (l);
 483     //shutdown (a, 0);
 484     //shutdown (c, 1);
 485     fd[0] = c;
 486     fd[1] = a;
 487     return 0;
 488
 489 error:
 490     if (l != INVALID_SOCKET)
 491         closesocket (l);
 492     if (c != INVALID_SOCKET)
 493         closesocket (c);
 494     return -1;
 495 }
 496
 497 #undef  read
 498 #define read( a, b, c )  recv (a, b, c, 0)
 499 #undef  write
 500 #define write( a, b, c ) send (a, b, c, 0)
 501 #undef  close
 502 #define close( a )       closesocket (a)
 503 #endif /* WIN32 */
 504
 505 /**
 506  * Returns the readable end of a pipe that becomes readable once termination
 507  * of the object is requested (vlc_object_kill()).
 508  * This can be used to wake-up out of a select() or poll() event loop, such
 509  * typically when doing network I/O.
 510  *
 511  * Note that the pipe will remain the same for the lifetime of the object.
 512  * DO NOT read the pipe nor close it yourself. Ever.
 513  *
 514  * @param obj object that would be "killed"
 515  * @return a readable pipe descriptor, or -1 on error.
 516  */
 517 int __vlc_object_waitpipe( vlc_object_t *obj )
 518 {
 519     int pfd[2] = { -1, -1 };
 520     vlc_object_internals_t *internals = vlc_internals( obj );
 521     bool killed = false;
 522
 523     vlc_spin_lock (&internals->spin);
 524     if (internals->pipes[0] == -1)
 525     {
 526         /* This can only ever happen if someone killed us without locking: */
 527         assert (internals->pipes[1] == -1);
 528         vlc_spin_unlock (&internals->spin);
 529
 530         if (pipe (pfd))
 531             return -1;
 532
 533         vlc_spin_lock (&internals->spin);
 534         if (internals->pipes[0] == -1)
 535         {
 536             internals->pipes[0] = pfd[0];
 537             internals->pipes[1] = pfd[1];
 538             pfd[0] = pfd[1] = -1;
 539         }
 540         killed = obj->b_die;
 541     }
 542     vlc_spin_unlock (&internals->spin);
 543
 544     if (killed)
 545     {
 546         /* Race condition: vlc_object_kill() already invoked! */
 547         int fd;
 548
 549         vlc_spin_lock (&internals->spin);
 550         fd = internals->pipes[1];
 551         internals->pipes[1] = -1;
 552         vlc_spin_unlock (&internals->spin);
 553
 554         msg_Dbg (obj, "waitpipe: object already dying");
 555         if (fd != -1)
 556             close (fd);
 557     }
 558
 559     /* Race condition: two threads call pipe() - unlikely */
 560     if (pfd[0] != -1)
 561         close (pfd[0]);
 562     if (pfd[1] != -1)
 563         close (pfd[1]);
 564
 565     return internals->pipes[0];
 566 }
 567
 568
 569 /**
 570  * Waits for the object to be signaled (using vlc_object_signal()).
 571  * If the object already has a signal pending, this function will return
 572  * immediately. It is asserted that the caller holds the object lock.
 573  *
 574  * @return true if the object is dying and should terminate.
 575  */
 576 bool __vlc_object_wait( vlc_object_t *obj )
 577 {
 578     vlc_assert_locked( &obj->object_lock );
 579     vlc_cond_wait( &obj->object_wait, &obj->object_lock );
 580     return obj->b_die;
 581 }
 582
 583
 584 /**
 585  * Waits for the object to be signaled (using vlc_object_signal()), or for
 586  * a timer to expire.
 587  * If the object already has a signal pending, this function will return
 588  * immediately. It is asserted that the caller holds the object lock.
 589  *
 590  * @return negative if the object is dying and should terminate,
 591  * positive if the the object has been signaled but is not dying,
 592  * 0 if timeout has been reached.
 593  */
 594 int __vlc_object_timedwait( vlc_object_t *obj, mtime_t deadline )
 595 {
 596     int v;
 597
 598     vlc_assert_locked( &obj->object_lock );
 599     v = vlc_cond_timedwait( &obj->object_wait, &obj->object_lock, deadline );
 600     if( v == 0 ) /* signaled */
 601         return obj->b_die ? -1 : 1;
 602     return 0;
 603 }
 604
 605
 606 /**
 607  * Checks whether an object has been "killed".
 608  * The object lock must be held.
 609  *
 610  * Typical code for an object thread could be:
 611  *
 612    vlc_object_lock (self);
 613    ...initialization...
 614    while (vlc_object_alive (self))
 615    {
 616        ...preprocessing...
 617
 618        if (vlc_object_wait (self))
 619            continue;
 620
 621        ...postprocessing...
 622    }
 623    ...deinitialization...
 624    vlc_object_unlock (self);
 625  *
 626  *
 627  * @return true iff the object has not been killed yet
 628  */
 629 bool __vlc_object_alive( vlc_object_t *obj )
 630 {
 631     vlc_assert_locked( &obj->object_lock );
 632     return !obj->b_die;
 633 }
 634
 635
 636 /**
 637  * Signals an object for which the lock is held.
 638  */
 639 void __vlc_object_signal_unlocked( vlc_object_t *obj )
 640 {
 641     vlc_assert_locked (&obj->object_lock);
 642     vlc_cond_signal( &obj->object_wait );
 643 }
 644
 645
 646 /**
 647  * Requests termination of an object.
 648  * If the object is LibVLC, also request to terminate all its children.
 649  */
 650 void __vlc_object_kill( vlc_object_t *p_this )
 651 {
 652     vlc_object_internals_t *internals = vlc_internals( p_this );
 653     int fd;
 654
 655     vlc_mutex_lock( &p_this->object_lock );
 656     p_this->b_die = true;
 657
 658     vlc_spin_lock (&internals->spin);
 659     fd = internals->pipes[1];
 660     internals->pipes[1] = -1;
 661     vlc_spin_unlock (&internals->spin);
 662
 663     if( fd != -1 )
 664     {
 665         msg_Dbg (p_this, "waitpipe: object killed");
 666         close (fd);
 667     }
 668
 669     if( p_this->i_object_type == VLC_OBJECT_LIBVLC )
 670         for( int i = 0; i < p_this->i_children ; i++ )
 671             vlc_object_kill( p_this->pp_children[i] );
 672
 673     vlc_object_signal_unlocked( p_this );
 674     vlc_mutex_unlock( &p_this->object_lock );
 675 }
 676
 677
 678 /**
 679  * find an object given its ID
 680  *
 681  * This function looks for the object whose i_object_id field is i_id. We
 682  * use a dichotomy so that lookups are in log2(n).
 683  *****************************************************************************/
 684 void * vlc_object_get( int i_id )
 685 {
 686     int i_max, i_middle;
 687     vlc_object_t **pp_objects;
 688     libvlc_global_data_t *p_libvlc_global = vlc_global();
 689
 690     vlc_mutex_lock( &structure_lock );
 691
 692     pp_objects = p_libvlc_global->pp_objects;
 693
 694     /* Perform our dichotomy */
 695     for( i_max = p_libvlc_global->i_objects - 1 ; ; )
 696     {
 697         i_middle = i_max / 2;
 698
 699         if( pp_objects[i_middle]->i_object_id > i_id )
 700         {
 701             i_max = i_middle;
 702         }
 703         else if( pp_objects[i_middle]->i_object_id < i_id )
 704         {
 705             if( i_middle )
 706             {
 707                 pp_objects += i_middle;
 708                 i_max -= i_middle;
 709             }
 710             else
 711             {
 712                 /* This happens when there are only two remaining objects */
 713                 if( pp_objects[i_middle+1]->i_object_id == i_id
 714                     && vlc_internals( pp_objects[i_middle+1] )->i_refcount > 0 )
 715                 {
 716                     vlc_object_yield_locked( pp_objects[i_middle+1] );
 717                     vlc_mutex_unlock( &structure_lock );
 718                     return pp_objects[i_middle+1];
 719                 }
 720                 break;
 721             }
 722         }
 723         else if( vlc_internals( pp_objects[i_middle] )->i_refcount > 0 )
 724         {
 725             vlc_object_yield_locked( pp_objects[i_middle] );
 726             vlc_mutex_unlock( &structure_lock );
 727             return pp_objects[i_middle];
 728         }
 729
 730         if( i_max == 0 )
 731         {
 732             /* this means that i_max == i_middle, and since we have already
 733              * tested pp_objects[i_middle]), p_found is properly set. */
 734             break;
 735         }
 736     }
 737
 738     vlc_mutex_unlock( &structure_lock );
 739     return NULL;
 740 }
 741
 742 /**
 743  ****************************************************************************
 744  * find a typed object and increment its refcount
 745  *****************************************************************************
 746  * This function recursively looks for a given object type. i_mode can be one
 747  * of FIND_PARENT, FIND_CHILD or FIND_ANYWHERE.
 748  *****************************************************************************/
 749 void * __vlc_object_find( vlc_object_t *p_this, int i_type, int i_mode )
 750 {
 751     vlc_object_t *p_found;
 752
 753     vlc_mutex_lock( &structure_lock );
 754
 755     /* If we are of the requested type ourselves, don't look further */
 756     if( !(i_mode & FIND_STRICT) && p_this->i_object_type == i_type
 757         && vlc_internals( p_this )->i_refcount > 0 )
 758     {
 759         vlc_object_yield_locked( p_this );
 760         vlc_mutex_unlock( &structure_lock );
 761         return p_this;
 762     }
 763
 764     /* Otherwise, recursively look for the object */
 765     if( (i_mode & 0x000f) == FIND_ANYWHERE )
 766     {
 767         vlc_object_t *p_root = p_this;
 768
 769         /* Find the root */
 770         while( p_root->p_parent != NULL &&
 771                p_root != VLC_OBJECT( p_this->p_libvlc ) )
 772         {
 773             p_root = p_root->p_parent;
 774         }
 775
 776         p_found = FindObject( p_root, i_type, (i_mode & ~0x000f)|FIND_CHILD );
 777         if( p_found == NULL && p_root != VLC_OBJECT( p_this->p_libvlc ) )
 778         {
 779             p_found = FindObject( VLC_OBJECT( p_this->p_libvlc ),
 780                                   i_type, (i_mode & ~0x000f)|FIND_CHILD );
 781         }
 782     }
 783     else
 784     {
 785         p_found = FindObject( p_this, i_type, i_mode );
 786     }
 787
 788     vlc_mutex_unlock( &structure_lock );
 789
 790     return p_found;
 791 }
 792
 793 /**
 794  ****************************************************************************
 795  * find a named object and increment its refcount
 796  *****************************************************************************
 797  * This function recursively looks for a given object name. i_mode can be one
 798  * of FIND_PARENT, FIND_CHILD or FIND_ANYWHERE.
 799  *****************************************************************************/
 800 void * __vlc_object_find_name( vlc_object_t *p_this, const char *psz_name,
 801                                int i_mode )
 802 {
 803     vlc_object_t *p_found;
 804
 805     vlc_mutex_lock( &structure_lock );
 806
 807     /* Avoid obvious freed object uses */
 808     assert( vlc_internals( p_this )->i_refcount > 0 );
 809
 810     /* If have the requested name ourselves, don't look further */
 811     if( !(i_mode & FIND_STRICT)
 812         && p_this->psz_object_name
 813         && !strcmp( p_this->psz_object_name, psz_name )
 814         && vlc_internals( p_this )->i_refcount > 0 )
 815     {
 816         vlc_object_yield_locked( p_this );
 817         vlc_mutex_unlock( &structure_lock );
 818         return p_this;
 819     }
 820
 821     /* Otherwise, recursively look for the object */
 822     if( (i_mode & 0x000f) == FIND_ANYWHERE )
 823     {
 824         vlc_object_t *p_root = p_this;
 825
 826         /* Find the root */
 827         while( p_root->p_parent != NULL &&
 828                p_root != VLC_OBJECT( p_this->p_libvlc ) )
 829         {
 830             p_root = p_root->p_parent;
 831         }
 832
 833         p_found = FindObjectName( p_root, psz_name,
 834                                  (i_mode & ~0x000f)|FIND_CHILD );
 835         if( p_found == NULL && p_root != VLC_OBJECT( p_this->p_libvlc ) )
 836         {
 837             p_found = FindObjectName( VLC_OBJECT( p_this->p_libvlc ),
 838                                       psz_name, (i_mode & ~0x000f)|FIND_CHILD );
 839         }
 840     }
 841     else
 842     {
 843         p_found = FindObjectName( p_this, psz_name, i_mode );
 844     }
 845
 846     vlc_mutex_unlock( &structure_lock );
 847
 848     return p_found;
 849 }
 850
 851 /**
 852  ****************************************************************************
 853  * increment an object refcount
 854  *****************************************************************************/
 855
 856 /* When the structure_lock is locked */
 857 static void vlc_object_yield_locked( vlc_object_t *p_this )
 858 {
 859     vlc_assert_locked (&structure_lock);
 860
 861     /* Avoid obvious freed object uses */
 862     assert( vlc_internals( p_this )->i_refcount > 0 );
 863
 864     /* Increment the counter */
 865     vlc_internals( p_this )->i_refcount++;
 866 }
 867
 868 /* Public function */
 869 void __vlc_object_yield( vlc_object_t *p_this )
 870 {
 871     vlc_mutex_lock( &structure_lock );
 872     vlc_object_yield_locked( p_this );
 873     vlc_mutex_unlock( &structure_lock );
 874 }
 875
 876
 877 /*****************************************************************************
 878  * decrement an object refcount
 879  * And destroy the object if its refcount reach zero.
 880  *****************************************************************************/
 881 void __vlc_object_release( vlc_object_t *p_this )
 882 {
 883     bool b_should_destroy;
 884
 885     vlc_mutex_lock( &structure_lock );
 886
 887     assert( vlc_internals( p_this )->i_refcount > 0 );
 888     vlc_internals( p_this )->i_refcount--;
 889     b_should_destroy = (vlc_internals( p_this )->i_refcount == 0);
 890
 891     if( b_should_destroy )
 892     {
 893         /* Make sure this object can't be obtained via vlc_find_object now that
 894          * it is freed */
 895         libvlc_global_data_t *p_libvlc_global = vlc_global();
 896         int i_index;
 897
 898         /* Wooohaa! If *this* fails, we're in serious trouble! Anyway it's
 899          * useless to try and recover anything if pp_objects gets smashed. */
 900         i_index = FindIndex( p_this, p_libvlc_global->pp_objects,
 901                              p_libvlc_global->i_objects );
 902         REMOVE_ELEM( p_libvlc_global->pp_objects,
 903                      p_libvlc_global->i_objects, i_index );
 904     }
 905
 906     vlc_mutex_unlock( &structure_lock );
 907
 908     if( b_should_destroy )
 909         vlc_object_destroy( p_this );
 910 }
 911
 912 /**
 913  ****************************************************************************
 914  * attach object to a parent object
 915  *****************************************************************************
 916  * This function sets p_this as a child of p_parent, and p_parent as a parent
 917  * of p_this. This link can be undone using vlc_object_detach.
 918  *****************************************************************************/
 919 void __vlc_object_attach( vlc_object_t *p_this, vlc_object_t *p_parent )
 920 {
 921     if( !p_this ) return;
 922
 923     vlc_mutex_lock( &structure_lock );
 924
 925     /* Avoid obvious freed object uses */
 926     assert( vlc_internals( p_this )->i_refcount > 0 );
 927
 928     /* Attach the parent to its child */
 929     p_this->p_parent = p_parent;
 930
 931     /* Attach the child to its parent */
 932     INSERT_ELEM( p_parent->pp_children, p_parent->i_children,
 933                  p_parent->i_children, p_this );
 934
 935     /* Climb up the tree to see whether we are connected with the root */
 936     if( vlc_internals( p_parent )->b_attached )
 937     {
 938         SetAttachment( p_this, true );
 939     }
 940
 941     vlc_mutex_unlock( &structure_lock );
 942 }
 943
 944 /**
 945  ****************************************************************************
 946  * detach object from its parent
 947  *****************************************************************************
 948  * This function removes all links between an object and its parent.
 949  *****************************************************************************/
 950 void __vlc_object_detach( vlc_object_t *p_this )
 951 {
 952     if( !p_this ) return;
 953
 954     vlc_mutex_lock( &structure_lock );
 955
 956     if( !p_this->p_parent )
 957     {
 958         msg_Err( p_this, "object is not attached" );
 959         vlc_mutex_unlock( &structure_lock );
 960         return;
 961     }
 962
 963     /* Climb up the tree to see whether we are connected with the root */
 964     if( vlc_internals( p_this->p_parent )->b_attached )
 965     {
 966         SetAttachment( p_this, false );
 967     }
 968
 969     DetachObject( p_this );
 970     vlc_mutex_unlock( &structure_lock );
 971     p_this = NULL;
 972 }
 973
 974 /**
 975  ****************************************************************************
 976  * find a list typed objects and increment their refcount
 977  *****************************************************************************
 978  * This function recursively looks for a given object type. i_mode can be one
 979  * of FIND_PARENT, FIND_CHILD or FIND_ANYWHERE.
 980  *****************************************************************************/
 981 vlc_list_t * __vlc_list_find( vlc_object_t *p_this, int i_type, int i_mode )
 982 {
 983     vlc_list_t *p_list;
 984     vlc_object_t **pp_current, **pp_end;
 985     int i_count = 0, i_index = 0;
 986     libvlc_global_data_t *p_libvlc_global = vlc_global();
 987
 988     vlc_mutex_lock( &structure_lock );
 989
 990     /* Look for the objects */
 991     switch( i_mode & 0x000f )
 992     {
 993     case FIND_ANYWHERE:
 994         pp_current = p_libvlc_global->pp_objects;
 995         pp_end = pp_current + p_libvlc_global->i_objects;
 996
 997         for( ; pp_current < pp_end ; pp_current++ )
 998         {
 999             if( vlc_internals(*pp_current)->b_attached
1000                  && (*pp_current)->i_object_type == i_type )
1001             {
1002                 i_count++;
1003             }
1004         }
1005
1006         p_list = NewList( i_count );
1007         pp_current = p_libvlc_global->pp_objects;
1008
1009         for( ; pp_current < pp_end ; pp_current++ )
1010         {
1011             if( vlc_internals(*pp_current)->b_attached
1012                  && (*pp_current)->i_object_type == i_type )
1013             {
1014                 ListReplace( p_list, *pp_current, i_index );
1015                 if( i_index < i_count ) i_index++;
1016             }
1017         }
1018     break;
1019
1020     case FIND_CHILD:
1021         i_count = CountChildren( p_this, i_type );
1022         p_list = NewList( i_count );
1023
1024         /* Check allocation was successful */
1025         if( p_list->i_count != i_count )
1026         {
1027             msg_Err( p_this, "list allocation failed!" );
1028             p_list->i_count = 0;
1029             break;
1030         }
1031
1032         p_list->i_count = 0;
1033         ListChildren( p_list, p_this, i_type );
1034         break;
1035
1036     default:
1037         msg_Err( p_this, "unimplemented!" );
1038         p_list = NewList( 0 );
1039         break;
1040     }
1041
1042     vlc_mutex_unlock( &structure_lock );
1043
1044     return p_list;
1045 }
1046
1047 /*****************************************************************************
1048  * DumpCommand: print the current vlc structure
1049  *****************************************************************************
1050  * This function prints either an ASCII tree showing the connections between
1051  * vlc objects, and additional information such as their refcount, thread ID,
1052  * etc. (command "tree"), or the same data as a simple list (command "list").
1053  *****************************************************************************/
1054 static int DumpCommand( vlc_object_t *p_this, char const *psz_cmd,
1055                         vlc_value_t oldval, vlc_value_t newval, void *p_data )
1056 {
1057     libvlc_global_data_t *p_libvlc_global = vlc_global();
1058
1059     (void)oldval; (void)p_data;
1060     if( *psz_cmd == 'l' )
1061     {
1062         vlc_mutex_lock( &structure_lock );
1063
1064         vlc_object_t **pp_current, **pp_end;
1065
1066         pp_current = p_libvlc_global->pp_objects;
1067         pp_end = pp_current + p_libvlc_global->i_objects;
1068
1069         for( ; pp_current < pp_end ; pp_current++ )
1070         {
1071             if( vlc_internals(*pp_current)->b_attached )
1072             {
1073                 PrintObject( *pp_current, "" );
1074             }
1075             else
1076             {
1077                 printf( " o %.8i %s (not attached)\n",
1078                         (*pp_current)->i_object_id,
1079                         (*pp_current)->psz_object_type );
1080             }
1081         }
1082
1083         vlc_mutex_unlock( &structure_lock );
1084     }
1085     else
1086     {
1087         vlc_object_t *p_object = NULL;
1088
1089         if( *newval.psz_string )
1090         {
1091             char *end;
1092             int i_id = strtol( newval.psz_string, &end, 0 );
1093             if( end != newval.psz_string )
1094                 p_object = vlc_object_get( i_id );
1095             else
1096             {
1097                 /* try using the object's name to find it */
1098                 vlc_object_t *p_libvlc = vlc_object_get( 1 );
1099                 if( p_libvlc )
1100                 {
1101                     /* Look in p_libvlc's children tree */
1102                     p_object = vlc_object_find_name( p_libvlc,
1103                                                      newval.psz_string,
1104                                                      FIND_CHILD );
1105                     vlc_object_release( p_libvlc );
1106                 }
1107                 if( !p_object )
1108                 {
1109                     /* If it's not in libvlc, look in libvlc_global (== p_this) */
1110                     p_object = vlc_object_find_name( p_this,
1111                                                      newval.psz_string,
1112                                                      FIND_CHILD );
1113                 }
1114             }
1115
1116             if( !p_object )
1117             {
1118                 return VLC_ENOOBJ;
1119             }
1120         }
1121
1122         vlc_mutex_lock( &structure_lock );
1123
1124         if( *psz_cmd == 't' )
1125         {
1126             char psz_foo[2 * MAX_DUMPSTRUCTURE_DEPTH + 1];
1127
1128             if( !p_object )
1129                 p_object = p_this->p_libvlc ? VLC_OBJECT(p_this->p_libvlc) : p_this;
1130
1131             psz_foo[0] = '|';
1132             DumpStructure( p_object, 0, psz_foo );
1133         }
1134         else if( *psz_cmd == 'v' )
1135         {
1136             int i;
1137
1138             if( !p_object )
1139                 p_object = p_this->p_libvlc ? VLC_OBJECT(p_this->p_libvlc) : p_this;
1140
1141             PrintObject( p_object, "" );
1142
1143             if( !vlc_internals( p_object )->i_vars )
1144                 printf( " `-o No variables\n" );
1145             for( i = 0; i < vlc_internals( p_object )->i_vars; i++ )
1146             {
1147                 variable_t *p_var = vlc_internals( p_object )->p_vars + i;
1148
1149                 const char *psz_type = "unknown";
1150                 switch( p_var->i_type & VLC_VAR_TYPE )
1151                 {
1152 #define MYCASE( type, nice )                \
1153                     case VLC_VAR_ ## type:  \
1154                         psz_type = nice;    \
1155                         break;
1156                     MYCASE( VOID, "void" );
1157                     MYCASE( BOOL, "bool" );
1158                     MYCASE( INTEGER, "integer" );
1159                     MYCASE( HOTKEY, "hotkey" );
1160                     MYCASE( STRING, "string" );
1161                     MYCASE( MODULE, "module" );
1162                     MYCASE( FILE, "file" );
1163                     MYCASE( DIRECTORY, "directory" );
1164                     MYCASE( VARIABLE, "variable" );
1165                     MYCASE( FLOAT, "float" );
1166                     MYCASE( TIME, "time" );
1167                     MYCASE( ADDRESS, "address" );
1168                     MYCASE( MUTEX, "mutex" );
1169                     MYCASE( LIST, "list" );
1170 #undef MYCASE
1171                 }
1172                 printf( " %c-o \"%s\" (%s",
1173                         i + 1 == vlc_internals( p_object )->i_vars ? '`' : '|',
1174                         p_var->psz_name, psz_type );
1175                 if( p_var->psz_text )
1176                     printf( ", %s", p_var->psz_text );
1177                 printf( ")" );
1178                 if( p_var->i_type & VLC_VAR_ISCOMMAND )
1179                     printf( ", command" );
1180                 if( p_var->i_entries )
1181                     printf( ", %d callbacks", p_var->i_entries );
1182                 switch( p_var->i_type & 0x00f0 )
1183                 {
1184                     case VLC_VAR_VOID:
1185                     case VLC_VAR_MUTEX:
1186                         break;
1187                     case VLC_VAR_BOOL:
1188                         printf( ": %s", p_var->val.b_bool ? "true" : "false" );
1189                         break;
1190                     case VLC_VAR_INTEGER:
1191                         printf( ": %d", p_var->val.i_int );
1192                         break;
1193                     case VLC_VAR_STRING:
1194                         printf( ": \"%s\"", p_var->val.psz_string );
1195                         break;
1196                     case VLC_VAR_FLOAT:
1197                         printf( ": %f", p_var->val.f_float );
1198                         break;
1199                     case VLC_VAR_TIME:
1200                         printf( ": %"PRIi64, (int64_t)p_var->val.i_time );
1201                         break;
1202                     case VLC_VAR_ADDRESS:
1203                         printf( ": %p", p_var->val.p_address );
1204                         break;
1205                     case VLC_VAR_LIST:
1206                         printf( ": TODO" );
1207                         break;
1208                 }
1209                 printf( "\n" );
1210             }
1211         }
1212
1213         vlc_mutex_unlock( &structure_lock );
1214
1215         if( *newval.psz_string )
1216         {
1217             vlc_object_release( p_object );
1218         }
1219     }
1220
1221     return VLC_SUCCESS;
1222 }
1223
1224 /*****************************************************************************
1225  * vlc_list_release: free a list previously allocated by vlc_list_find
1226  *****************************************************************************
1227  * This function decreases the refcount of all objects in the list and
1228  * frees the list.
1229  *****************************************************************************/
1230 void vlc_list_release( vlc_list_t *p_list )
1231 {
1232     int i_index;
1233
1234     for( i_index = 0; i_index < p_list->i_count; i_index++ )
1235     {
1236         vlc_object_release( p_list->p_values[i_index].p_object );
1237     }
1238
1239     free( p_list->p_values );
1240     free( p_list );
1241 }
1242
1243 /*****************************************************************************
1244  * dump an object. (Debug function)
1245  *****************************************************************************/
1246 void __vlc_object_dump( vlc_object_t *p_this )
1247 {
1248     vlc_mutex_lock( &structure_lock );
1249     char psz_foo[2 * MAX_DUMPSTRUCTURE_DEPTH + 1];
1250     psz_foo[0] = '|';
1251     DumpStructure( p_this, 0, psz_foo );
1252     vlc_mutex_unlock( &structure_lock );
1253 }
1254
1255 /* Following functions are local */
1256
1257 /*****************************************************************************
1258  * FindIndex: find the index of an object in an array of objects
1259  *****************************************************************************
1260  * This function assumes that p_this can be found in pp_objects. It will not
1261  * crash if p_this cannot be found, but will return a wrong value. It is your
1262  * duty to check the return value if you are not certain that the object could
1263  * be found for sure.
1264  *****************************************************************************/
1265 static int FindIndex( vlc_object_t *p_this,
1266                       vlc_object_t **pp_objects, int i_count )
1267 {
1268     int i_middle = i_count / 2;
1269
1270     if( i_count == 0 )
1271     {
1272         return 0;
1273     }
1274
1275     if( pp_objects[i_middle] == p_this )
1276     {
1277         return i_middle;
1278     }
1279
1280     if( i_count == 1 )
1281     {
1282         return 0;
1283     }
1284
1285     /* We take advantage of the sorted array */
1286     if( pp_objects[i_middle]->i_object_id < p_this->i_object_id )
1287     {
1288         return i_middle + FindIndex( p_this, pp_objects + i_middle,
1289                                              i_count - i_middle );
1290     }
1291     else
1292     {
1293         return FindIndex( p_this, pp_objects, i_middle );
1294     }
1295 }
1296
1297 static vlc_object_t * FindObject( vlc_object_t *p_this, int i_type, int i_mode )
1298 {
1299     int i;
1300     vlc_object_t *p_tmp;
1301
1302     switch( i_mode & 0x000f )
1303     {
1304     case FIND_PARENT:
1305         p_tmp = p_this->p_parent;
1306         if( p_tmp )
1307         {
1308             if( p_tmp->i_object_type == i_type
1309                 && vlc_internals( p_tmp )->i_refcount > 0 )
1310             {
1311                 vlc_object_yield_locked( p_tmp );
1312                 return p_tmp;
1313             }
1314             else
1315             {
1316                 return FindObject( p_tmp, i_type, i_mode );
1317             }
1318         }
1319         break;
1320
1321     case FIND_CHILD:
1322         for( i = p_this->i_children; i--; )
1323         {
1324             p_tmp = p_this->pp_children[i];
1325             if( p_tmp->i_object_type == i_type
1326                 && vlc_internals( p_tmp )->i_refcount > 0 )
1327             {
1328                 vlc_object_yield_locked( p_tmp );
1329                 return p_tmp;
1330             }
1331             else if( p_tmp->i_children )
1332             {
1333                 p_tmp = FindObject( p_tmp, i_type, i_mode );
1334                 if( p_tmp )
1335                 {
1336                     return p_tmp;
1337                 }
1338             }
1339         }
1340         break;
1341
1342     case FIND_ANYWHERE:
1343         /* Handled in vlc_object_find */
1344         break;
1345     }
1346
1347     return NULL;
1348 }
1349
1350 static vlc_object_t * FindObjectName( vlc_object_t *p_this,
1351                                       const char *psz_name,
1352                                       int i_mode )
1353 {
1354     int i;
1355     vlc_object_t *p_tmp;
1356
1357     switch( i_mode & 0x000f )
1358     {
1359     case FIND_PARENT:
1360         p_tmp = p_this->p_parent;
1361         if( p_tmp )
1362         {
1363             if( p_tmp->psz_object_name
1364                 && !strcmp( p_tmp->psz_object_name, psz_name )
1365                 && vlc_internals( p_tmp )->i_refcount > 0 )
1366             {
1367                 vlc_object_yield_locked( p_tmp );
1368                 return p_tmp;
1369             }
1370             else
1371             {
1372                 return FindObjectName( p_tmp, psz_name, i_mode );
1373             }
1374         }
1375         break;
1376
1377     case FIND_CHILD:
1378         for( i = p_this->i_children; i--; )
1379         {
1380             p_tmp = p_this->pp_children[i];
1381             if( p_tmp->psz_object_name
1382                 && !strcmp( p_tmp->psz_object_name, psz_name )
1383                 && vlc_internals( p_tmp )->i_refcount > 0 )
1384             {
1385                 vlc_object_yield_locked( p_tmp );
1386                 return p_tmp;
1387             }
1388             else if( p_tmp->i_children )
1389             {
1390                 p_tmp = FindObjectName( p_tmp, psz_name, i_mode );
1391                 if( p_tmp )
1392                 {
1393                     return p_tmp;
1394                 }
1395             }
1396         }
1397         break;
1398
1399     case FIND_ANYWHERE:
1400         /* Handled in vlc_object_find */
1401         break;
1402     }
1403
1404     return NULL;
1405 }
1406
1407 static void DetachObject( vlc_object_t *p_this )
1408 {
1409     vlc_object_t *p_parent = p_this->p_parent;
1410     int i_index, i;
1411
1412     /* Remove p_this's parent */
1413     p_this->p_parent = NULL;
1414
1415     /* Remove all of p_parent's children which are p_this */
1416     for( i_index = p_parent->i_children ; i_index-- ; )
1417     {
1418         if( p_parent->pp_children[i_index] == p_this )
1419         {
1420             p_parent->i_children--;
1421             for( i = i_index ; i < p_parent->i_children ; i++ )
1422             {
1423                 p_parent->pp_children[i] = p_parent->pp_children[i+1];
1424             }
1425         }
1426     }
1427
1428     if( p_parent->i_children )
1429     {
1430         p_parent->pp_children = (vlc_object_t **)realloc( p_parent->pp_children,
1431                                p_parent->i_children * sizeof(vlc_object_t *) );
1432     }
1433     else
1434     {
1435         free( p_parent->pp_children );
1436         p_parent->pp_children = NULL;
1437     }
1438 }
1439
1440 /*****************************************************************************
1441  * SetAttachment: recursively set the b_attached flag of a subtree.
1442  *****************************************************************************
1443  * This function is used by the attach and detach functions to propagate
1444  * the b_attached flag in a subtree.
1445  *****************************************************************************/
1446 static void SetAttachment( vlc_object_t *p_this, bool b_attached )
1447 {
1448     int i_index;
1449
1450     for( i_index = p_this->i_children ; i_index-- ; )
1451     {
1452         SetAttachment( p_this->pp_children[i_index], b_attached );
1453     }
1454
1455     vlc_internals( p_this )->b_attached = b_attached;
1456 }
1457
1458 static void PrintObject( vlc_object_t *p_this, const char *psz_prefix )
1459 {
1460     char psz_children[20], psz_refcount[20], psz_thread[30], psz_name[50],
1461          psz_parent[20];
1462
1463     memset( &psz_name, 0, sizeof(psz_name) );
1464     if( p_this->psz_object_name )
1465     {
1466         snprintf( psz_name, 49, " \"%s\"", p_this->psz_object_name );
1467         if( psz_name[48] )
1468             psz_name[48] = '\"';
1469     }
1470
1471     psz_children[0] = '\0';
1472     switch( p_this->i_children )
1473     {
1474         case 0:
1475             break;
1476         case 1:
1477             strcpy( psz_children, ", 1 child" );
1478             break;
1479         default:
1480             snprintf( psz_children, 19, ", %i children", p_this->i_children );
1481             break;
1482     }
1483
1484     psz_refcount[0] = '\0';
1485     if( vlc_internals( p_this )->i_refcount > 0 )
1486         snprintf( psz_refcount, 19, ", refcount %u",
1487                   vlc_internals( p_this )->i_refcount );
1488
1489     psz_thread[0] = '\0';
1490     if( vlc_internals( p_this )->b_thread )
1491         snprintf( psz_thread, 29, " (thread %u)",
1492 #if defined(WIN32) || defined(UNDER_CE)
1493                   (unsigned)vlc_internals( p_this )->thread_id.id );
1494 #else
1495                   (unsigned)vlc_internals( p_this )->thread_id );
1496 #endif
1497
1498     psz_parent[0] = '\0';
1499     if( p_this->p_parent )
1500         snprintf( psz_parent, 19, ", parent %i", p_this->p_parent->i_object_id );
1501
1502     printf( " %so %.8i %s%s%s%s%s%s\n", psz_prefix,
1503             p_this->i_object_id, p_this->psz_object_type,
1504             psz_name, psz_thread, psz_refcount, psz_children,
1505             psz_parent );
1506 }
1507
1508 static void DumpStructure( vlc_object_t *p_this, int i_level, char *psz_foo )
1509 {
1510     int i;
1511     char i_back = psz_foo[i_level];
1512     psz_foo[i_level] = '\0';
1513
1514     PrintObject( p_this, psz_foo );
1515
1516     psz_foo[i_level] = i_back;
1517
1518     if( i_level / 2 >= MAX_DUMPSTRUCTURE_DEPTH )
1519     {
1520         msg_Warn( p_this, "structure tree is too deep" );
1521         return;
1522     }
1523
1524     for( i = 0 ; i < p_this->i_children ; i++ )
1525     {
1526         if( i_level )
1527         {
1528             psz_foo[i_level-1] = ' ';
1529
1530             if( psz_foo[i_level-2] == '`' )
1531             {
1532                 psz_foo[i_level-2] = ' ';
1533             }
1534         }
1535
1536         if( i == p_this->i_children - 1 )
1537         {
1538             psz_foo[i_level] = '`';
1539         }
1540         else
1541         {
1542             psz_foo[i_level] = '|';
1543         }
1544
1545         psz_foo[i_level+1] = '-';
1546         psz_foo[i_level+2] = '\0';
1547
1548         DumpStructure( p_this->pp_children[i], i_level + 2, psz_foo );
1549     }
1550 }
1551
1552 static vlc_list_t * NewList( int i_count )
1553 {
1554     vlc_list_t * p_list = (vlc_list_t *)malloc( sizeof( vlc_list_t ) );
1555     if( p_list == NULL )
1556     {
1557         return NULL;
1558     }
1559
1560     p_list->i_count = i_count;
1561
1562     if( i_count == 0 )
1563     {
1564         p_list->p_values = NULL;
1565         return p_list;
1566     }
1567
1568     p_list->p_values = malloc( i_count * sizeof( vlc_value_t ) );
1569     if( p_list->p_values == NULL )
1570     {
1571         p_list->i_count = 0;
1572         return p_list;
1573     }
1574
1575     return p_list;
1576 }
1577
1578 static void ListReplace( vlc_list_t *p_list, vlc_object_t *p_object,
1579                          int i_index )
1580 {
1581     if( p_list == NULL || i_index >= p_list->i_count )
1582     {
1583         return;
1584     }
1585
1586     vlc_object_yield_locked( p_object );
1587
1588     p_list->p_values[i_index].p_object = p_object;
1589
1590     return;
1591 }
1592
1593 /*static void ListAppend( vlc_list_t *p_list, vlc_object_t *p_object )
1594 {
1595     if( p_list == NULL )
1596     {
1597         return;
1598     }
1599
1600     p_list->p_values = realloc( p_list->p_values, (p_list->i_count + 1)
1601                                 * sizeof( vlc_value_t ) );
1602     if( p_list->p_values == NULL )
1603     {
1604         p_list->i_count = 0;
1605         return;
1606     }
1607
1608     vlc_object_yield_locked( p_object );
1609
1610     p_list->p_values[p_list->i_count].p_object = p_object;
1611     p_list->i_count++;
1612
1613     return;
1614 }*/
1615
1616 static int CountChildren( vlc_object_t *p_this, int i_type )
1617 {
1618     vlc_object_t *p_tmp;
1619     int i, i_count = 0;
1620
1621     for( i = 0; i < p_this->i_children; i++ )
1622     {
1623         p_tmp = p_this->pp_children[i];
1624
1625         if( p_tmp->i_object_type == i_type )
1626         {
1627             i_count++;
1628         }
1629
1630         if( p_tmp->i_children )
1631         {
1632             i_count += CountChildren( p_tmp, i_type );
1633         }
1634     }
1635
1636     return i_count;
1637 }
1638
1639 static void ListChildren( vlc_list_t *p_list, vlc_object_t *p_this, int i_type )
1640 {
1641     vlc_object_t *p_tmp;
1642     int i;
1643
1644     for( i = 0; i < p_this->i_children; i++ )
1645     {
1646         p_tmp = p_this->pp_children[i];
1647
1648         if( p_tmp->i_object_type == i_type )
1649         {
1650             ListReplace( p_list, p_tmp, p_list->i_count++ );
1651         }
1652
1653         if( p_tmp->i_children )
1654         {
1655             ListChildren( p_list, p_tmp, i_type );
1656         }
1657     }
1658 }