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 # include <errno.h> /* ENOSYS */
  68 #endif
  69
  70 /*****************************************************************************
  71  * Local prototypes
  72  *****************************************************************************/
  73 static int  DumpCommand( vlc_object_t *, char const *,
  74                          vlc_value_t, vlc_value_t, void * );
  75
  76 static vlc_object_t * FindObject    ( vlc_object_t *, int, int );
  77 static vlc_object_t * FindObjectName( vlc_object_t *, const char *, int );
  78 static void           DetachObject  ( vlc_object_t * );
  79 static void           PrintObject   ( vlc_object_t *, const char * );
  80 static void           DumpStructure ( vlc_object_t *, int, char * );
  81 static int            FindIndex     ( vlc_object_t *, vlc_object_t **, int );
  82 static void           SetAttachment ( vlc_object_t *, vlc_bool_t );
  83
  84 static vlc_list_t   * NewList       ( int );
  85 static void           ListReplace   ( vlc_list_t *, vlc_object_t *, int );
  86 /*static void           ListAppend    ( vlc_list_t *, vlc_object_t * );*/
  87 static int            CountChildren ( vlc_object_t *, int );
  88 static void           ListChildren  ( vlc_list_t *, vlc_object_t *, int );
  89
  90 /*****************************************************************************
  91  * Local structure lock
  92  *****************************************************************************/
  93 static vlc_mutex_t    structure_lock;
  94 static vlc_object_internals_t global_internals;
  95
  96 vlc_object_t *vlc_custom_create( vlc_object_t *p_this, size_t i_size,
  97                                  int i_type, const char *psz_type )
  98 {
  99     vlc_object_t *p_new;
 100     vlc_object_internals_t *p_priv;
 101
 102     if( i_type == VLC_OBJECT_GLOBAL )
 103     {
 104         p_new = p_this;
 105         p_priv = &global_internals;
 106         memset( p_priv, 0, sizeof( *p_priv ) );
 107     }
 108     else
 109     {
 110         p_priv = calloc( 1, sizeof( *p_priv ) + i_size );
 111         if( p_priv == NULL )
 112             return NULL;
 113
 114         p_new = (vlc_object_t *)(p_priv + 1);
 115     }
 116
 117     p_new->p_internals = p_priv;
 118     p_new->i_object_type = i_type;
 119     p_new->psz_object_type = psz_type;
 120
 121     p_new->psz_object_name = NULL;
 122
 123     p_new->b_die = VLC_FALSE;
 124     p_new->b_error = VLC_FALSE;
 125     p_new->b_dead = VLC_FALSE;
 126     p_priv->b_attached = VLC_FALSE;
 127     p_new->b_force = VLC_FALSE;
 128
 129     p_new->psz_header = NULL;
 130
 131     if( p_this->i_flags & OBJECT_FLAGS_NODBG )
 132         p_new->i_flags |= OBJECT_FLAGS_NODBG;
 133     if( p_this->i_flags & OBJECT_FLAGS_QUIET )
 134         p_new->i_flags |= OBJECT_FLAGS_QUIET;
 135     if( p_this->i_flags & OBJECT_FLAGS_NOINTERACT )
 136         p_new->i_flags |= OBJECT_FLAGS_NOINTERACT;
 137
 138     p_priv->p_vars = calloc( sizeof( variable_t ), 16 );
 139
 140     if( !p_priv->p_vars )
 141     {
 142         if( i_type != VLC_OBJECT_GLOBAL )
 143             free( p_priv );
 144         return NULL;
 145     }
 146
 147     if( i_type == VLC_OBJECT_GLOBAL )
 148     {
 149         /* If i_type is global, then p_new is actually p_libvlc_global */
 150         libvlc_global_data_t *p_libvlc_global = (libvlc_global_data_t *)p_new;
 151         p_new->p_libvlc = NULL;
 152
 153         p_libvlc_global->i_counter = 0;
 154         p_new->i_object_id = 0;
 155
 156         p_libvlc_global->i_objects = 1;
 157         p_libvlc_global->pp_objects = malloc( sizeof(vlc_object_t *) );
 158         p_libvlc_global->pp_objects[0] = p_new;
 159         p_priv->b_attached = VLC_TRUE;
 160     }
 161     else
 162     {
 163         libvlc_global_data_t *p_libvlc_global = vlc_global();
 164         if( i_type == VLC_OBJECT_LIBVLC )
 165         {
 166             p_new->p_libvlc = (libvlc_int_t*)p_new;
 167             p_priv->b_attached = VLC_TRUE;
 168         }
 169         else
 170         {
 171             p_new->p_libvlc = p_this->p_libvlc;
 172         }
 173
 174         vlc_mutex_lock( &structure_lock );
 175
 176         p_libvlc_global->i_counter++;
 177         p_new->i_object_id = p_libvlc_global->i_counter;
 178
 179         /* Wooohaa! If *this* fails, we're in serious trouble! Anyway it's
 180          * useless to try and recover anything if pp_objects gets smashed. */
 181         TAB_APPEND( p_libvlc_global->i_objects, p_libvlc_global->pp_objects,
 182                     p_new );
 183
 184         vlc_mutex_unlock( &structure_lock );
 185     }
 186
 187     p_priv->i_refcount = 0;
 188     p_new->p_parent = NULL;
 189     p_new->pp_children = NULL;
 190     p_new->i_children = 0;
 191
 192     p_new->p_private = NULL;
 193
 194     /* Initialize mutexes and condvars */
 195     vlc_mutex_init( p_new, &p_new->object_lock );
 196     vlc_cond_init( p_new, &p_new->object_wait );
 197     vlc_mutex_init( p_new, &p_priv->var_lock );
 198     p_priv->pipes[0] = p_priv->pipes[1] = -1;
 199
 200     if( i_type == VLC_OBJECT_GLOBAL )
 201     {
 202         vlc_mutex_init( p_new, &structure_lock );
 203     }
 204
 205     if( i_type == VLC_OBJECT_LIBVLC )
 206     {
 207         var_Create( p_new, "list", VLC_VAR_STRING | VLC_VAR_ISCOMMAND );
 208         var_AddCallback( p_new, "list", DumpCommand, NULL );
 209         var_Create( p_new, "tree", VLC_VAR_STRING | VLC_VAR_ISCOMMAND );
 210         var_AddCallback( p_new, "tree", DumpCommand, NULL );
 211         var_Create( p_new, "vars", VLC_VAR_STRING | VLC_VAR_ISCOMMAND );
 212         var_AddCallback( p_new, "vars", DumpCommand, NULL );
 213     }
 214
 215     return p_new;
 216 }
 217
 218
 219 /**
 220  * Allocates and initializes a vlc object.
 221  *
 222  * @param i_type known object type (all of them are negative integer values),
 223  *               or object byte size (always positive).
 224  *
 225  * @return the new object, or NULL on error.
 226  */
 227 void * __vlc_object_create( vlc_object_t *p_this, int i_type )
 228 {
 229     const char   * psz_type;
 230     size_t         i_size;
 231
 232     switch( i_type )
 233     {
 234         case VLC_OBJECT_GLOBAL:
 235             i_size = sizeof(libvlc_global_data_t);
 236             psz_type = "global";
 237             break;
 238         case VLC_OBJECT_LIBVLC:
 239             i_size = sizeof(libvlc_int_t);
 240             psz_type = "libvlc";
 241             break;
 242         case VLC_OBJECT_INTF:
 243             i_size = sizeof(intf_thread_t);
 244             psz_type = "interface";
 245             break;
 246         case VLC_OBJECT_DIALOGS:
 247             i_size = sizeof(intf_thread_t);
 248             psz_type = "dialogs";
 249             break;
 250         case VLC_OBJECT_PLAYLIST:
 251             i_size = sizeof(playlist_t);
 252             psz_type = "playlist";
 253             break;
 254         case VLC_OBJECT_SD:
 255             i_size = sizeof(services_discovery_t);
 256             psz_type = "services discovery";
 257             break;
 258         case VLC_OBJECT_INPUT:
 259             i_size = sizeof(input_thread_t);
 260             psz_type = "input";
 261             break;
 262         case VLC_OBJECT_DEMUX:
 263             i_size = sizeof(demux_t);
 264             psz_type = "demux";
 265             break;
 266         case VLC_OBJECT_ACCESS:
 267             i_size = sizeof(access_t);
 268             psz_type = "access";
 269             break;
 270         case VLC_OBJECT_DECODER:
 271             i_size = sizeof(decoder_t);
 272             psz_type = "decoder";
 273             break;
 274         case VLC_OBJECT_PACKETIZER:
 275             i_size = sizeof(decoder_t);
 276             psz_type = "packetizer";
 277             break;
 278         case VLC_OBJECT_ENCODER:
 279             i_size = sizeof(encoder_t);
 280             psz_type = "encoder";
 281             break;
 282         case VLC_OBJECT_FILTER:
 283             i_size = sizeof(filter_t);
 284             psz_type = "filter";
 285             break;
 286         case VLC_OBJECT_VOUT:
 287             i_size = sizeof(vout_thread_t);
 288             psz_type = "video output";
 289             break;
 290         case VLC_OBJECT_SPU:
 291             i_size = sizeof(spu_t);
 292             psz_type = "subpicture";
 293             break;
 294         case VLC_OBJECT_AOUT:
 295             i_size = sizeof(aout_instance_t);
 296             psz_type = "audio output";
 297             break;
 298         case VLC_OBJECT_SOUT:
 299             i_size = sizeof(sout_instance_t);
 300             psz_type = "stream output";
 301             break;
 302         case VLC_OBJECT_VLM:
 303             i_size = sizeof( vlm_t );
 304             psz_type = "vlm dameon";
 305             break;
 306         case VLC_OBJECT_VOD:
 307             i_size = sizeof( vod_t );
 308             psz_type = "vod server";
 309             break;
 310         case VLC_OBJECT_XML:
 311             i_size = sizeof( xml_t );
 312             psz_type = "xml";
 313             break;
 314         case VLC_OBJECT_OPENGL:
 315             i_size = sizeof( vout_thread_t );
 316             psz_type = "opengl";
 317             break;
 318         case VLC_OBJECT_ANNOUNCE:
 319             i_size = sizeof( announce_handler_t );
 320             psz_type = "announce";
 321             break;
 322         case VLC_OBJECT_META_ENGINE:
 323             i_size = sizeof( meta_engine_t );
 324             psz_type = "meta engine";
 325             break;
 326         case VLC_OBJECT_OSDMENU:
 327             i_size = sizeof( osd_menu_t );
 328             psz_type = "osd menu";
 329             break;
 330         default:
 331             i_size = i_type > (int)sizeof(vlc_object_t)
 332                          ? i_type : (int)sizeof(vlc_object_t);
 333             i_type = VLC_OBJECT_GENERIC;
 334             psz_type = "generic";
 335             break;
 336     }
 337
 338     return vlc_custom_create( p_this, i_size, i_type, psz_type );
 339 }
 340
 341
 342 /**
 343  ****************************************************************************
 344  * Destroy a vlc object
 345  *
 346  * This function destroys an object that has been previously allocated with
 347  * vlc_object_create. The object's refcount must be zero and it must not be
 348  * attached to other objects in any way.
 349  *****************************************************************************/
 350 void __vlc_object_destroy( vlc_object_t *p_this )
 351 {
 352     vlc_object_internals_t *p_priv = vlc_internals( p_this );
 353     int i_delay = 0;
 354
 355     if( p_this->i_children )
 356     {
 357         msg_Err( p_this, "cannot delete object (%i, %s) with children" ,
 358                  p_this->i_object_id, p_this->psz_object_name );
 359         return;
 360     }
 361
 362     if( p_this->p_parent )
 363     {
 364         msg_Err( p_this, "cannot delete object (%i, %s) with a parent",
 365                  p_this->i_object_id, p_this->psz_object_name );
 366         return;
 367     }
 368
 369     while( p_priv->i_refcount > 0 )
 370     {
 371         i_delay++;
 372
 373         /* Don't warn immediately ... 100ms seems OK */
 374         if( i_delay == 2 )
 375         {
 376             msg_Warn( p_this,
 377                   "refcount is %u, delaying before deletion (id=%d,type=%d)",
 378                   p_priv->i_refcount, p_this->i_object_id,
 379                   p_this->i_object_type );
 380         }
 381         else if( i_delay == 10 )
 382         {
 383             msg_Err( p_this,
 384                   "refcount is %u, delaying again (id=%d,type=%d)",
 385                   p_priv->i_refcount, p_this->i_object_id,
 386                   p_this->i_object_type );
 387         }
 388         else if( i_delay == 20 )
 389         {
 390             msg_Err( p_this,
 391                   "waited too long, cancelling destruction (id=%d,type=%d)",
 392                   p_this->i_object_id, p_this->i_object_type );
 393             return;
 394         }
 395
 396         msleep( 100000 );
 397     }
 398
 399     /* Destroy the associated variables, starting from the end so that
 400      * no memmove calls have to be done. */
 401     while( p_priv->i_vars )
 402     {
 403         var_Destroy( p_this, p_priv->p_vars[p_priv->i_vars - 1].psz_name );
 404     }
 405
 406     free( p_priv->p_vars );
 407     vlc_mutex_destroy( &p_priv->var_lock );
 408
 409     if( p_this->psz_header ) free( p_this->psz_header );
 410
 411     if( p_this->i_object_type == VLC_OBJECT_GLOBAL )
 412     {
 413         libvlc_global_data_t *p_global = (libvlc_global_data_t *)p_this;
 414         /* We are the global object ... no need to lock. */
 415         free( p_global->pp_objects );
 416         p_global->pp_objects = NULL;
 417         p_global->i_objects--;
 418
 419         vlc_mutex_destroy( &structure_lock );
 420     }
 421     else
 422     {
 423         libvlc_global_data_t *p_libvlc_global = vlc_global();
 424         int i_index;
 425
 426         vlc_mutex_lock( &structure_lock );
 427
 428         /* Wooohaa! If *this* fails, we're in serious trouble! Anyway it's
 429          * useless to try and recover anything if pp_objects gets smashed. */
 430         i_index = FindIndex( p_this, p_libvlc_global->pp_objects,
 431                              p_libvlc_global->i_objects );
 432         REMOVE_ELEM( p_libvlc_global->pp_objects,
 433                      p_libvlc_global->i_objects, i_index );
 434
 435         vlc_mutex_unlock( &structure_lock );
 436     }
 437
 438 #if defined(WIN32) || defined(UNDER_CE)
 439     /* if object has an associated thread, close it now */
 440     if( p_priv->thread_id.hThread )
 441        CloseHandle(p_priv->thread_id.hThread);
 442 #endif
 443
 444     vlc_mutex_destroy( &p_this->object_lock );
 445     vlc_cond_destroy( &p_this->object_wait );
 446     if( p_priv->pipes[0] != -1 )
 447         close( p_priv->pipes[0] );
 448     if( p_priv->pipes[1] != -1 )
 449         close( p_priv->pipes[1] );
 450
 451     /* global is not dynamically allocated by vlc_object_create */
 452     if( p_this->i_object_type != VLC_OBJECT_GLOBAL )
 453         free( p_priv );
 454 }
 455
 456
 457 /** Inter-object signaling */
 458
 459 void __vlc_object_lock( vlc_object_t *obj )
 460 {
 461     vlc_mutex_lock( &obj->object_lock );
 462 }
 463
 464 void __vlc_object_unlock( vlc_object_t *obj )
 465 {
 466     vlc_assert_locked( &obj->object_lock );
 467     vlc_mutex_unlock( &obj->object_lock );
 468 }
 469
 470 #ifdef WIN32
 471 # include <winsock2.h>
 472 # include <ws2tcpip.h>
 473
 474 /**
 475  * select()-able pipes emulated using Winsock
 476  */
 477 static int pipe (int fd[2])
 478 {
 479     SOCKADDR_IN addr;
 480     int addrlen = sizeof (addr);
 481
 482     SOCKET l = socket (PF_INET, SOCK_STREAM, IPPROTO_TCP), a,
 483            c = socket (PF_INET, SOCK_STREAM, IPPROTO_TCP);
 484     if ((l == INVALID_SOCKET) || (c == INVALID_SOCKET))
 485         goto error;
 486
 487     memset (&addr, 0, sizeof (addr));
 488     addr.sin_family = AF_INET;
 489     addr.sin_addr.s_addr = htonl (INADDR_LOOPBACK);
 490     if (bind (l, (PSOCKADDR)&addr, sizeof (addr))
 491      || getsockname (l, (PSOCKADDR)&addr, &addrlen)
 492      || listen (l, 1)
 493      || connect (c, (PSOCKADDR)&addr, addrlen))
 494         goto error;
 495
 496     a = accept (l, NULL, NULL);
 497     if (a == INVALID_SOCKET)
 498         goto error;
 499
 500     closesocket (l);
 501     shutdown (a, 0);
 502     shutdown (c, 1);
 503     fd[0] = c;
 504     fd[1] = a;
 505     return 0;
 506
 507 error:
 508     if (l != INVALID_SOCKET)
 509         closesocket (l);
 510     if (c != INVALID_SOCKET)
 511         closesocket (c);
 512     return -1;
 513 }
 514
 515 #undef  read
 516 #define read( a, b, c )  recv (a, b, c, 0)
 517 #undef  write
 518 #define write( a, b, c ) send (a, b, c, 0)
 519 #undef  close
 520 #define close( a )       closesocket (a)
 521 #endif /* WIN32 */
 522
 523 /**
 524  * Returns the readable end of a pipe that becomes readable whenever
 525  * an object is signaled. This can be used to wait for VLC object events
 526  * inside select(), poll() loops or frameworks providing an event loop.
 527  *
 528  * Note that the pipe will remain the same for the lifetime of the object.
 529  * DO NOT close it yourself. Ever.
 530  *
 531  * DO NOT try to read from the pipe either: call vlc_object_wait() instead.
 532  * Assuming the pipe is readable, vlc_object_wait() will not block.
 533  * Also note that, as with vlc_object_wait(), there may be spurious wakeups.
 534  *
 535  * @param obj object that would be signaled (object lock MUST hold)
 536  * @return a readable pipe descriptor, or -1 on error.
 537  */
 538 int __vlc_object_waitpipe( vlc_object_t *obj )
 539 {
 540     int *pipes = obj->p_internals->pipes;
 541     vlc_assert_locked( &obj->object_lock );
 542
 543     if( pipes[1] == -1 )
 544     {
 545         /* This can only ever happen if someone killed us without locking */
 546         assert( pipes[0] == -1 );
 547
 548         if( pipe( pipes ) )
 549             return -1;
 550     }
 551
 552     return pipes[0];
 553 }
 554
 555
 556 /**
 557  * Waits for the object to be signaled (using vlc_object_signal()).
 558  * If the object already has a signal pending, this function will return
 559  * immediately. It is asserted that the caller holds the object lock.
 560  *
 561  * @return true if the object is dying and should terminate.
 562  */
 563 vlc_bool_t __vlc_object_wait( vlc_object_t *obj )
 564 {
 565     vlc_assert_locked( &obj->object_lock );
 566
 567     int fd = obj->p_internals->pipes[0];
 568     if( fd != -1 )
 569     {
 570         while (read (fd, &(char){ 0 }, 1  < 0));
 571         return obj->b_die;
 572     }
 573
 574     vlc_cond_wait( &obj->object_wait, &obj->object_lock );
 575     return obj->b_die;
 576 }
 577
 578
 579 /**
 580  * Waits for the object to be signaled (using vlc_object_signal()), or for
 581  * a timer to expire.
 582  * If the object already has a signal pending, this function will return
 583  * immediately. It is asserted that the caller holds the object lock.
 584  *
 585  * @return negative if the object is dying and should terminate,
 586  * positive if the the object has been signaled but is not dying,
 587  * 0 if timeout has been reached.
 588  */
 589 int __vlc_object_timedwait( vlc_object_t *obj, mtime_t deadline )
 590 {
 591     int v;
 592
 593     vlc_assert_locked( &obj->object_lock );
 594     v = vlc_cond_timedwait( &obj->object_wait, &obj->object_lock, deadline );
 595     if( v == 0 ) /* signaled */
 596         return obj->b_die ? -1 : 1;
 597     return 0;
 598 }
 599
 600
 601 /**
 602  * Checks whether an object has been "killed".
 603  * The object lock must be held.
 604  *
 605  * Typical code for an object thread could be:
 606  *
 607    vlc_object_lock (self);
 608    ...initialization...
 609    while (vlc_object_alive (self))
 610    {
 611        ...preprocessing...
 612
 613        if (vlc_object_wait (self))
 614            continue;
 615
 616        ...postprocessing...
 617    }
 618    ...deinitialization...
 619    vlc_object_unlock (self);
 620  *
 621  *
 622  * @return true iff the object has not been killed yet
 623  */
 624 vlc_bool_t __vlc_object_alive( vlc_object_t *obj )
 625 {
 626     vlc_assert_locked( &obj->object_lock );
 627     return !obj->b_die;
 628 }
 629
 630
 631 /**
 632  * Signals an object for which the lock is held.
 633  */
 634 void __vlc_object_signal_unlocked( vlc_object_t *obj )
 635 {
 636     vlc_assert_locked( &obj->object_lock );
 637
 638     int fd = obj->p_internals->pipes[1];
 639     if( fd != -1 )
 640         while( write( fd, &(char){ 0 }, 1 ) < 0 );
 641
 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_mutex_lock( &p_this->object_lock );
 653     p_this->b_die = VLC_TRUE;
 654
 655     if( p_this->i_object_type == VLC_OBJECT_LIBVLC )
 656         for( int i = 0; i < p_this->i_children ; i++ )
 657             vlc_object_kill( p_this->pp_children[i] );
 658
 659     vlc_object_signal_unlocked( p_this );
 660     vlc_mutex_unlock( &p_this->object_lock );
 661 }
 662
 663
 664 /**
 665  * find an object given its ID
 666  *
 667  * This function looks for the object whose i_object_id field is i_id. We
 668  * use a dichotomy so that lookups are in log2(n).
 669  *****************************************************************************/
 670 void * __vlc_object_get( vlc_object_t *p_this, int i_id )
 671 {
 672     int i_max, i_middle;
 673     vlc_object_t **pp_objects;
 674     libvlc_global_data_t *p_libvlc_global = vlc_global();
 675
 676     vlc_mutex_lock( &structure_lock );
 677
 678     pp_objects = p_libvlc_global->pp_objects;
 679
 680     /* Perform our dichotomy */
 681     for( i_max = p_libvlc_global->i_objects - 1 ; ; )
 682     {
 683         i_middle = i_max / 2;
 684
 685         if( pp_objects[i_middle]->i_object_id > i_id )
 686         {
 687             i_max = i_middle;
 688         }
 689         else if( pp_objects[i_middle]->i_object_id < i_id )
 690         {
 691             if( i_middle )
 692             {
 693                 pp_objects += i_middle;
 694                 i_max -= i_middle;
 695             }
 696             else
 697             {
 698                 /* This happens when there are only two remaining objects */
 699                 if( pp_objects[i_middle+1]->i_object_id == i_id )
 700                 {
 701                     vlc_mutex_unlock( &structure_lock );
 702                     pp_objects[i_middle+1]->p_internals->i_refcount++;
 703                     return pp_objects[i_middle+1];
 704                 }
 705                 break;
 706             }
 707         }
 708         else
 709         {
 710             vlc_mutex_unlock( &structure_lock );
 711             pp_objects[i_middle]->p_internals->i_refcount++;
 712             return pp_objects[i_middle];
 713         }
 714
 715         if( i_max == 0 )
 716         {
 717             /* this means that i_max == i_middle, and since we have already
 718              * tested pp_objects[i_middle]), p_found is properly set. */
 719             break;
 720         }
 721     }
 722
 723     vlc_mutex_unlock( &structure_lock );
 724     return NULL;
 725 }
 726
 727 /**
 728  ****************************************************************************
 729  * find a typed object and increment its refcount
 730  *****************************************************************************
 731  * This function recursively looks for a given object type. i_mode can be one
 732  * of FIND_PARENT, FIND_CHILD or FIND_ANYWHERE.
 733  *****************************************************************************/
 734 void * __vlc_object_find( vlc_object_t *p_this, int i_type, int i_mode )
 735 {
 736     vlc_object_t *p_found;
 737
 738     vlc_mutex_lock( &structure_lock );
 739
 740     /* If we are of the requested type ourselves, don't look further */
 741     if( !(i_mode & FIND_STRICT) && p_this->i_object_type == i_type )
 742     {
 743         p_this->p_internals->i_refcount++;
 744         vlc_mutex_unlock( &structure_lock );
 745         return p_this;
 746     }
 747
 748     /* Otherwise, recursively look for the object */
 749     if( (i_mode & 0x000f) == FIND_ANYWHERE )
 750     {
 751         vlc_object_t *p_root = p_this;
 752
 753         /* Find the root */
 754         while( p_root->p_parent != NULL &&
 755                p_root != VLC_OBJECT( p_this->p_libvlc ) )
 756         {
 757             p_root = p_root->p_parent;
 758         }
 759
 760         p_found = FindObject( p_root, i_type, (i_mode & ~0x000f)|FIND_CHILD );
 761         if( p_found == NULL && p_root != VLC_OBJECT( p_this->p_libvlc ) )
 762         {
 763             p_found = FindObject( VLC_OBJECT( p_this->p_libvlc ),
 764                                   i_type, (i_mode & ~0x000f)|FIND_CHILD );
 765         }
 766     }
 767     else
 768     {
 769         p_found = FindObject( p_this, i_type, i_mode );
 770     }
 771
 772     vlc_mutex_unlock( &structure_lock );
 773
 774     return p_found;
 775 }
 776
 777 /**
 778  ****************************************************************************
 779  * find a named object and increment its refcount
 780  *****************************************************************************
 781  * This function recursively looks for a given object name. i_mode can be one
 782  * of FIND_PARENT, FIND_CHILD or FIND_ANYWHERE.
 783  *****************************************************************************/
 784 void * __vlc_object_find_name( vlc_object_t *p_this, const char *psz_name,
 785                                int i_mode )
 786 {
 787     vlc_object_t *p_found;
 788
 789     vlc_mutex_lock( &structure_lock );
 790
 791     /* If have the requested name ourselves, don't look further */
 792     if( !(i_mode & FIND_STRICT)
 793         && p_this->psz_object_name
 794         && !strcmp( p_this->psz_object_name, psz_name ) )
 795     {
 796         p_this->p_internals->i_refcount++;
 797         vlc_mutex_unlock( &structure_lock );
 798         return p_this;
 799     }
 800
 801     /* Otherwise, recursively look for the object */
 802     if( (i_mode & 0x000f) == FIND_ANYWHERE )
 803     {
 804         vlc_object_t *p_root = p_this;
 805
 806         /* Find the root */
 807         while( p_root->p_parent != NULL &&
 808                p_root != VLC_OBJECT( p_this->p_libvlc ) )
 809         {
 810             p_root = p_root->p_parent;
 811         }
 812
 813         p_found = FindObjectName( p_root, psz_name,
 814                                  (i_mode & ~0x000f)|FIND_CHILD );
 815         if( p_found == NULL && p_root != VLC_OBJECT( p_this->p_libvlc ) )
 816         {
 817             p_found = FindObjectName( VLC_OBJECT( p_this->p_libvlc ),
 818                                       psz_name, (i_mode & ~0x000f)|FIND_CHILD );
 819         }
 820     }
 821     else
 822     {
 823         p_found = FindObjectName( p_this, psz_name, i_mode );
 824     }
 825
 826     vlc_mutex_unlock( &structure_lock );
 827
 828     return p_found;
 829 }
 830
 831 /**
 832  ****************************************************************************
 833  * increment an object refcount
 834  *****************************************************************************/
 835 void __vlc_object_yield( vlc_object_t *p_this )
 836 {
 837     vlc_mutex_lock( &structure_lock );
 838     p_this->p_internals->i_refcount++;
 839     vlc_mutex_unlock( &structure_lock );
 840 }
 841
 842 static inline void Release( vlc_object_t *obj )
 843 {
 844     assert( obj->p_internals->i_refcount > 0 );
 845     obj->p_internals->i_refcount--;
 846 }
 847
 848 /*****************************************************************************
 849  * decrement an object refcount
 850  *****************************************************************************/
 851 void __vlc_object_release( vlc_object_t *p_this )
 852 {
 853     vlc_mutex_lock( &structure_lock );
 854     Release( p_this );
 855     vlc_mutex_unlock( &structure_lock );
 856 }
 857
 858 /**
 859  ****************************************************************************
 860  * attach object to a parent object
 861  *****************************************************************************
 862  * This function sets p_this as a child of p_parent, and p_parent as a parent
 863  * of p_this. This link can be undone using vlc_object_detach.
 864  *****************************************************************************/
 865 void __vlc_object_attach( vlc_object_t *p_this, vlc_object_t *p_parent )
 866 {
 867     if( !p_this ) return;
 868
 869     vlc_mutex_lock( &structure_lock );
 870
 871     /* Attach the parent to its child */
 872     p_this->p_parent = p_parent;
 873
 874     /* Attach the child to its parent */
 875     INSERT_ELEM( p_parent->pp_children, p_parent->i_children,
 876                  p_parent->i_children, p_this );
 877
 878     /* Climb up the tree to see whether we are connected with the root */
 879     if( p_parent->p_internals->b_attached )
 880     {
 881         SetAttachment( p_this, VLC_TRUE );
 882     }
 883
 884     vlc_mutex_unlock( &structure_lock );
 885 }
 886
 887 /**
 888  ****************************************************************************
 889  * detach object from its parent
 890  *****************************************************************************
 891  * This function removes all links between an object and its parent.
 892  *****************************************************************************/
 893 void __vlc_object_detach( vlc_object_t *p_this )
 894 {
 895     if( !p_this ) return;
 896
 897     vlc_mutex_lock( &structure_lock );
 898     if( !p_this->p_parent )
 899     {
 900         msg_Err( p_this, "object is not attached" );
 901         vlc_mutex_unlock( &structure_lock );
 902         return;
 903     }
 904
 905     /* Climb up the tree to see whether we are connected with the root */
 906     if( p_this->p_parent->p_internals->b_attached )
 907     {
 908         SetAttachment( p_this, VLC_FALSE );
 909     }
 910
 911     DetachObject( p_this );
 912     vlc_mutex_unlock( &structure_lock );
 913     p_this = NULL;
 914 }
 915
 916 /**
 917  ****************************************************************************
 918  * find a list typed objects and increment their refcount
 919  *****************************************************************************
 920  * This function recursively looks for a given object type. i_mode can be one
 921  * of FIND_PARENT, FIND_CHILD or FIND_ANYWHERE.
 922  *****************************************************************************/
 923 vlc_list_t * __vlc_list_find( vlc_object_t *p_this, int i_type, int i_mode )
 924 {
 925     vlc_list_t *p_list;
 926     vlc_object_t **pp_current, **pp_end;
 927     int i_count = 0, i_index = 0;
 928     libvlc_global_data_t *p_libvlc_global = vlc_global();
 929
 930     vlc_mutex_lock( &structure_lock );
 931
 932     /* Look for the objects */
 933     switch( i_mode & 0x000f )
 934     {
 935     case FIND_ANYWHERE:
 936         pp_current = p_libvlc_global->pp_objects;
 937         pp_end = pp_current + p_libvlc_global->i_objects;
 938
 939         for( ; pp_current < pp_end ; pp_current++ )
 940         {
 941             if( (*pp_current)->p_internals->b_attached
 942                  && (*pp_current)->i_object_type == i_type )
 943             {
 944                 i_count++;
 945             }
 946         }
 947
 948         p_list = NewList( i_count );
 949         pp_current = p_libvlc_global->pp_objects;
 950
 951         for( ; pp_current < pp_end ; pp_current++ )
 952         {
 953             if( (*pp_current)->p_internals->b_attached
 954                  && (*pp_current)->i_object_type == i_type )
 955             {
 956                 ListReplace( p_list, *pp_current, i_index );
 957                 if( i_index < i_count ) i_index++;
 958             }
 959         }
 960     break;
 961
 962     case FIND_CHILD:
 963         i_count = CountChildren( p_this, i_type );
 964         p_list = NewList( i_count );
 965
 966         /* Check allocation was successful */
 967         if( p_list->i_count != i_count )
 968         {
 969             msg_Err( p_this, "list allocation failed!" );
 970             p_list->i_count = 0;
 971             break;
 972         }
 973
 974         p_list->i_count = 0;
 975         ListChildren( p_list, p_this, i_type );
 976         break;
 977
 978     default:
 979         msg_Err( p_this, "unimplemented!" );
 980         p_list = NewList( 0 );
 981         break;
 982     }
 983
 984     vlc_mutex_unlock( &structure_lock );
 985
 986     return p_list;
 987 }
 988
 989 /*****************************************************************************
 990  * DumpCommand: print the current vlc structure
 991  *****************************************************************************
 992  * This function prints either an ASCII tree showing the connections between
 993  * vlc objects, and additional information such as their refcount, thread ID,
 994  * etc. (command "tree"), or the same data as a simple list (command "list").
 995  *****************************************************************************/
 996 static int DumpCommand( vlc_object_t *p_this, char const *psz_cmd,
 997                         vlc_value_t oldval, vlc_value_t newval, void *p_data )
 998 {
 999     libvlc_global_data_t *p_libvlc_global = vlc_global();
1000
1001     (void)oldval; (void)p_data;
1002     if( *psz_cmd == 'l' )
1003     {
1004         vlc_mutex_lock( &structure_lock );
1005
1006         vlc_object_t **pp_current, **pp_end;
1007
1008         pp_current = p_libvlc_global->pp_objects;
1009         pp_end = pp_current + p_libvlc_global->i_objects;
1010
1011         for( ; pp_current < pp_end ; pp_current++ )
1012         {
1013             if( (*pp_current)->p_internals->b_attached )
1014             {
1015                 PrintObject( *pp_current, "" );
1016             }
1017             else
1018             {
1019                 printf( " o %.8i %s (not attached)\n",
1020                         (*pp_current)->i_object_id,
1021                         (*pp_current)->psz_object_type );
1022             }
1023         }
1024
1025         vlc_mutex_unlock( &structure_lock );
1026     }
1027     else
1028     {
1029         vlc_object_t *p_object = NULL;
1030
1031         if( *newval.psz_string )
1032         {
1033             char *end;
1034             int i_id = strtol( newval.psz_string, &end, 0 );
1035             if( end != newval.psz_string )
1036                 p_object = vlc_object_get( p_this, i_id );
1037             else
1038             {
1039                 /* try using the object's name to find it */
1040                 vlc_object_t *p_libvlc = vlc_object_get( p_this, 1 );
1041                 if( p_libvlc )
1042                 {
1043                     /* Look in p_libvlc's children tree */
1044                     p_object = vlc_object_find_name( p_libvlc,
1045                                                      newval.psz_string,
1046                                                      FIND_CHILD );
1047                     vlc_object_release( p_libvlc );
1048                 }
1049                 if( !p_object )
1050                 {
1051                     /* If it's not in libvlc, look in libvlc_global (== p_this) */
1052                     p_object = vlc_object_find_name( p_this,
1053                                                      newval.psz_string,
1054                                                      FIND_CHILD );
1055                 }
1056             }
1057
1058             if( !p_object )
1059             {
1060                 return VLC_ENOOBJ;
1061             }
1062         }
1063
1064         vlc_mutex_lock( &structure_lock );
1065
1066         if( *psz_cmd == 't' )
1067         {
1068             char psz_foo[2 * MAX_DUMPSTRUCTURE_DEPTH + 1];
1069
1070             if( !p_object )
1071                 p_object = p_this->p_libvlc ? VLC_OBJECT(p_this->p_libvlc) : p_this;
1072
1073             psz_foo[0] = '|';
1074             DumpStructure( p_object, 0, psz_foo );
1075         }
1076         else if( *psz_cmd == 'v' )
1077         {
1078             int i;
1079
1080             if( !p_object )
1081                 p_object = p_this->p_libvlc ? VLC_OBJECT(p_this->p_libvlc) : p_this;
1082
1083             PrintObject( p_object, "" );
1084
1085             if( !p_object->p_internals->i_vars )
1086                 printf( " `-o No variables\n" );
1087             for( i = 0; i < p_object->p_internals->i_vars; i++ )
1088             {
1089                 variable_t *p_var = p_object->p_internals->p_vars + i;
1090
1091                 const char *psz_type = "unknown";
1092                 switch( p_var->i_type & VLC_VAR_TYPE )
1093                 {
1094 #define MYCASE( type, nice )                \
1095                     case VLC_VAR_ ## type:  \
1096                         psz_type = nice;    \
1097                         break;
1098                     MYCASE( VOID, "void" );
1099                     MYCASE( BOOL, "bool" );
1100                     MYCASE( INTEGER, "integer" );
1101                     MYCASE( HOTKEY, "hotkey" );
1102                     MYCASE( STRING, "string" );
1103                     MYCASE( MODULE, "module" );
1104                     MYCASE( FILE, "file" );
1105                     MYCASE( DIRECTORY, "directory" );
1106                     MYCASE( VARIABLE, "variable" );
1107                     MYCASE( FLOAT, "float" );
1108                     MYCASE( TIME, "time" );
1109                     MYCASE( ADDRESS, "address" );
1110                     MYCASE( MUTEX, "mutex" );
1111                     MYCASE( LIST, "list" );
1112 #undef MYCASE
1113                 }
1114                 printf( " %c-o \"%s\" (%s",
1115                         i + 1 == p_object->p_internals->i_vars ? '`' : '|',
1116                         p_var->psz_name, psz_type );
1117                 if( p_var->psz_text )
1118                     printf( ", %s", p_var->psz_text );
1119                 printf( ")" );
1120                 if( p_var->i_type & VLC_VAR_ISCOMMAND )
1121                     printf( ", command" );
1122                 if( p_var->i_entries )
1123                     printf( ", %d callbacks", p_var->i_entries );
1124                 switch( p_var->i_type & 0x00f0 )
1125                 {
1126                     case VLC_VAR_VOID:
1127                     case VLC_VAR_MUTEX:
1128                         break;
1129                     case VLC_VAR_BOOL:
1130                         printf( ": %s", p_var->val.b_bool ? "true" : "false" );
1131                         break;
1132                     case VLC_VAR_INTEGER:
1133                         printf( ": %d", p_var->val.i_int );
1134                         break;
1135                     case VLC_VAR_STRING:
1136                         printf( ": \"%s\"", p_var->val.psz_string );
1137                         break;
1138                     case VLC_VAR_FLOAT:
1139                         printf( ": %f", p_var->val.f_float );
1140                         break;
1141                     case VLC_VAR_TIME:
1142                         printf( ": " I64Fi, (int64_t)p_var->val.i_time );
1143                         break;
1144                     case VLC_VAR_ADDRESS:
1145                         printf( ": %p", p_var->val.p_address );
1146                         break;
1147                     case VLC_VAR_LIST:
1148                         printf( ": TODO" );
1149                         break;
1150                 }
1151                 printf( "\n" );
1152             }
1153         }
1154
1155         vlc_mutex_unlock( &structure_lock );
1156
1157         if( *newval.psz_string )
1158         {
1159             vlc_object_release( p_object );
1160         }
1161     }
1162
1163     return VLC_SUCCESS;
1164 }
1165
1166 /*****************************************************************************
1167  * vlc_list_release: free a list previously allocated by vlc_list_find
1168  *****************************************************************************
1169  * This function decreases the refcount of all objects in the list and
1170  * frees the list.
1171  *****************************************************************************/
1172 void vlc_list_release( vlc_list_t *p_list )
1173 {
1174     int i_index;
1175
1176     vlc_mutex_lock( &structure_lock );
1177     for( i_index = 0; i_index < p_list->i_count; i_index++ )
1178     {
1179         Release( p_list->p_values[i_index].p_object );
1180     }
1181     vlc_mutex_unlock( &structure_lock );
1182
1183     free( p_list->p_values );
1184     free( p_list );
1185 }
1186
1187 /* Following functions are local */
1188
1189 /*****************************************************************************
1190  * FindIndex: find the index of an object in an array of objects
1191  *****************************************************************************
1192  * This function assumes that p_this can be found in pp_objects. It will not
1193  * crash if p_this cannot be found, but will return a wrong value. It is your
1194  * duty to check the return value if you are not certain that the object could
1195  * be found for sure.
1196  *****************************************************************************/
1197 static int FindIndex( vlc_object_t *p_this,
1198                       vlc_object_t **pp_objects, int i_count )
1199 {
1200     int i_middle = i_count / 2;
1201
1202     if( i_count == 0 )
1203     {
1204         return 0;
1205     }
1206
1207     if( pp_objects[i_middle] == p_this )
1208     {
1209         return i_middle;
1210     }
1211
1212     if( i_count == 1 )
1213     {
1214         return 0;
1215     }
1216
1217     /* We take advantage of the sorted array */
1218     if( pp_objects[i_middle]->i_object_id < p_this->i_object_id )
1219     {
1220         return i_middle + FindIndex( p_this, pp_objects + i_middle,
1221                                              i_count - i_middle );
1222     }
1223     else
1224     {
1225         return FindIndex( p_this, pp_objects, i_middle );
1226     }
1227 }
1228
1229 static vlc_object_t * FindObject( vlc_object_t *p_this, int i_type, int i_mode )
1230 {
1231     int i;
1232     vlc_object_t *p_tmp;
1233
1234     switch( i_mode & 0x000f )
1235     {
1236     case FIND_PARENT:
1237         p_tmp = p_this->p_parent;
1238         if( p_tmp )
1239         {
1240             if( p_tmp->i_object_type == i_type )
1241             {
1242                 p_tmp->p_internals->i_refcount++;
1243                 return p_tmp;
1244             }
1245             else
1246             {
1247                 return FindObject( p_tmp, i_type, i_mode );
1248             }
1249         }
1250         break;
1251
1252     case FIND_CHILD:
1253         for( i = p_this->i_children; i--; )
1254         {
1255             p_tmp = p_this->pp_children[i];
1256             if( p_tmp->i_object_type == i_type )
1257             {
1258                 p_tmp->p_internals->i_refcount++;
1259                 return p_tmp;
1260             }
1261             else if( p_tmp->i_children )
1262             {
1263                 p_tmp = FindObject( p_tmp, i_type, i_mode );
1264                 if( p_tmp )
1265                 {
1266                     return p_tmp;
1267                 }
1268             }
1269         }
1270         break;
1271
1272     case FIND_ANYWHERE:
1273         /* Handled in vlc_object_find */
1274         break;
1275     }
1276
1277     return NULL;
1278 }
1279
1280 static vlc_object_t * FindObjectName( vlc_object_t *p_this,
1281                                       const char *psz_name,
1282                                       int i_mode )
1283 {
1284     int i;
1285     vlc_object_t *p_tmp;
1286
1287     switch( i_mode & 0x000f )
1288     {
1289     case FIND_PARENT:
1290         p_tmp = p_this->p_parent;
1291         if( p_tmp )
1292         {
1293             if( p_tmp->psz_object_name
1294                 && !strcmp( p_tmp->psz_object_name, psz_name ) )
1295             {
1296                 p_tmp->p_internals->i_refcount++;
1297                 return p_tmp;
1298             }
1299             else
1300             {
1301                 return FindObjectName( p_tmp, psz_name, i_mode );
1302             }
1303         }
1304         break;
1305
1306     case FIND_CHILD:
1307         for( i = p_this->i_children; i--; )
1308         {
1309             p_tmp = p_this->pp_children[i];
1310             if( p_tmp->psz_object_name
1311                 && !strcmp( p_tmp->psz_object_name, psz_name ) )
1312             {
1313                 p_tmp->p_internals->i_refcount++;
1314                 return p_tmp;
1315             }
1316             else if( p_tmp->i_children )
1317             {
1318                 p_tmp = FindObjectName( p_tmp, psz_name, i_mode );
1319                 if( p_tmp )
1320                 {
1321                     return p_tmp;
1322                 }
1323             }
1324         }
1325         break;
1326
1327     case FIND_ANYWHERE:
1328         /* Handled in vlc_object_find */
1329         break;
1330     }
1331
1332     return NULL;
1333 }
1334
1335 static void DetachObject( vlc_object_t *p_this )
1336 {
1337     vlc_object_t *p_parent = p_this->p_parent;
1338     int i_index, i;
1339
1340     /* Remove p_this's parent */
1341     p_this->p_parent = NULL;
1342
1343     /* Remove all of p_parent's children which are p_this */
1344     for( i_index = p_parent->i_children ; i_index-- ; )
1345     {
1346         if( p_parent->pp_children[i_index] == p_this )
1347         {
1348             p_parent->i_children--;
1349             for( i = i_index ; i < p_parent->i_children ; i++ )
1350             {
1351                 p_parent->pp_children[i] = p_parent->pp_children[i+1];
1352             }
1353         }
1354     }
1355
1356     if( p_parent->i_children )
1357     {
1358         p_parent->pp_children = (vlc_object_t **)realloc( p_parent->pp_children,
1359                                p_parent->i_children * sizeof(vlc_object_t *) );
1360     }
1361     else
1362     {
1363         free( p_parent->pp_children );
1364         p_parent->pp_children = NULL;
1365     }
1366 }
1367
1368 /*****************************************************************************
1369  * SetAttachment: recursively set the b_attached flag of a subtree.
1370  *****************************************************************************
1371  * This function is used by the attach and detach functions to propagate
1372  * the b_attached flag in a subtree.
1373  *****************************************************************************/
1374 static void SetAttachment( vlc_object_t *p_this, vlc_bool_t b_attached )
1375 {
1376     int i_index;
1377
1378     for( i_index = p_this->i_children ; i_index-- ; )
1379     {
1380         SetAttachment( p_this->pp_children[i_index], b_attached );
1381     }
1382
1383     p_this->p_internals->b_attached = b_attached;
1384 }
1385
1386 static void PrintObject( vlc_object_t *p_this, const char *psz_prefix )
1387 {
1388     char psz_children[20], psz_refcount[20], psz_thread[30], psz_name[50],
1389          psz_parent[20];
1390
1391     psz_name[0] = '\0';
1392     if( p_this->psz_object_name )
1393     {
1394         snprintf( psz_name, 49, " \"%s\"", p_this->psz_object_name );
1395         if( psz_name[48] )
1396             psz_name[48] = '\"';
1397     }
1398
1399     psz_children[0] = '\0';
1400     switch( p_this->i_children )
1401     {
1402         case 0:
1403             break;
1404         case 1:
1405             strcpy( psz_children, ", 1 child" );
1406             break;
1407         default:
1408             snprintf( psz_children, 19, ", %i children", p_this->i_children );
1409             break;
1410     }
1411
1412     psz_refcount[0] = '\0';
1413     if( p_this->p_internals->i_refcount > 0 )
1414         snprintf( psz_refcount, 19, ", refcount %u",
1415                   p_this->p_internals->i_refcount );
1416
1417     psz_thread[0] = '\0';
1418     if( p_this->p_internals->b_thread )
1419         snprintf( psz_thread, 29, " (thread %u)",
1420 #if defined(WIN32) || defined(UNDER_CE)
1421                   (unsigned)p_this->p_internals->thread_id.id );
1422 #else
1423                   (unsigned)p_this->p_internals->thread_id );
1424 #endif
1425
1426     psz_parent[0] = '\0';
1427     if( p_this->p_parent )
1428         snprintf( psz_parent, 19, ", parent %i", p_this->p_parent->i_object_id );
1429
1430     printf( " %so %.8i %s%s%s%s%s%s\n", psz_prefix,
1431             p_this->i_object_id, p_this->psz_object_type,
1432             psz_name, psz_thread, psz_refcount, psz_children,
1433             psz_parent );
1434 }
1435
1436 static void DumpStructure( vlc_object_t *p_this, int i_level, char *psz_foo )
1437 {
1438     int i;
1439     char i_back = psz_foo[i_level];
1440     psz_foo[i_level] = '\0';
1441
1442     PrintObject( p_this, psz_foo );
1443
1444     psz_foo[i_level] = i_back;
1445
1446     if( i_level / 2 >= MAX_DUMPSTRUCTURE_DEPTH )
1447     {
1448         msg_Warn( p_this, "structure tree is too deep" );
1449         return;
1450     }
1451
1452     for( i = 0 ; i < p_this->i_children ; i++ )
1453     {
1454         if( i_level )
1455         {
1456             psz_foo[i_level-1] = ' ';
1457
1458             if( psz_foo[i_level-2] == '`' )
1459             {
1460                 psz_foo[i_level-2] = ' ';
1461             }
1462         }
1463
1464         if( i == p_this->i_children - 1 )
1465         {
1466             psz_foo[i_level] = '`';
1467         }
1468         else
1469         {
1470             psz_foo[i_level] = '|';
1471         }
1472
1473         psz_foo[i_level+1] = '-';
1474         psz_foo[i_level+2] = '\0';
1475
1476         DumpStructure( p_this->pp_children[i], i_level + 2, psz_foo );
1477     }
1478 }
1479
1480 static vlc_list_t * NewList( int i_count )
1481 {
1482     vlc_list_t * p_list = (vlc_list_t *)malloc( sizeof( vlc_list_t ) );
1483     if( p_list == NULL )
1484     {
1485         return NULL;
1486     }
1487
1488     p_list->i_count = i_count;
1489
1490     if( i_count == 0 )
1491     {
1492         p_list->p_values = NULL;
1493         return p_list;
1494     }
1495
1496     p_list->p_values = malloc( i_count * sizeof( vlc_value_t ) );
1497     if( p_list->p_values == NULL )
1498     {
1499         p_list->i_count = 0;
1500         return p_list;
1501     }
1502
1503     return p_list;
1504 }
1505
1506 static void ListReplace( vlc_list_t *p_list, vlc_object_t *p_object,
1507                          int i_index )
1508 {
1509     if( p_list == NULL || i_index >= p_list->i_count )
1510     {
1511         return;
1512     }
1513
1514     p_object->p_internals->i_refcount++;
1515
1516     p_list->p_values[i_index].p_object = p_object;
1517
1518     return;
1519 }
1520
1521 /*static void ListAppend( vlc_list_t *p_list, vlc_object_t *p_object )
1522 {
1523     if( p_list == NULL )
1524     {
1525         return;
1526     }
1527
1528     p_list->p_values = realloc( p_list->p_values, (p_list->i_count + 1)
1529                                 * sizeof( vlc_value_t ) );
1530     if( p_list->p_values == NULL )
1531     {
1532         p_list->i_count = 0;
1533         return;
1534     }
1535
1536     p_object->p_internals->i_refcount++;
1537
1538     p_list->p_values[p_list->i_count].p_object = p_object;
1539     p_list->i_count++;
1540
1541     return;
1542 }*/
1543
1544 static int CountChildren( vlc_object_t *p_this, int i_type )
1545 {
1546     vlc_object_t *p_tmp;
1547     int i, i_count = 0;
1548
1549     for( i = 0; i < p_this->i_children; i++ )
1550     {
1551         p_tmp = p_this->pp_children[i];
1552
1553         if( p_tmp->i_object_type == i_type )
1554         {
1555             i_count++;
1556         }
1557
1558         if( p_tmp->i_children )
1559         {
1560             i_count += CountChildren( p_tmp, i_type );
1561         }
1562     }
1563
1564     return i_count;
1565 }
1566
1567 static void ListChildren( vlc_list_t *p_list, vlc_object_t *p_this, int i_type )
1568 {
1569     vlc_object_t *p_tmp;
1570     int i;
1571
1572     for( i = 0; i < p_this->i_children; i++ )
1573     {
1574         p_tmp = p_this->pp_children[i];
1575
1576         if( p_tmp->i_object_type == i_type )
1577         {
1578             ListReplace( p_list, p_tmp, p_list->i_count++ );
1579         }
1580
1581         if( p_tmp->i_children )
1582         {
1583             ListChildren( p_list, p_tmp, i_type );
1584         }
1585     }
1586 }