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 /**
 471  * Returns the readable end of a pipe that becomes readable whenever
 472  * an object is signaled. This can be used to wait for VLC object events
 473  * inside select(), poll() loops or frameworks providing an event loop.
 474  *
 475  * Note that the pipe will remain the same for the lifetime of the object.
 476  * DO NOT close it yourself. Ever.
 477  *
 478  * DO NOT try to read from the pipe either: call vlc_object_wait() instead.
 479  * Assuming the pipe is readable, vlc_object_wait() will not block.
 480  * Also note that, as with vlc_object_wait(), there may be spurious wakeups.
 481  *
 482  * @param obj object that would be signaled (object lock MUST hold)
 483  * @return a readable pipe descriptor, or -1 on error.
 484  */
 485 int vlc_object_waitpipe( vlc_object_t *obj )
 486 {
 487     int *pipes = obj->p_internals->pipes;
 488     vlc_assert_locked( &obj->object_lock );
 489
 490     if( pipes[1] == -1 )
 491     {
 492         /* This can only ever happen if someone killed us without locking */
 493         assert( pipes[0] == -1 );
 494
 495 #ifndef WIN32
 496         if( pipe( pipes ) )
 497 #else
 498         errno = ENOSYS;
 499 #endif
 500             return -1;
 501     }
 502
 503     return pipes[0];
 504 }
 505
 506
 507 /**
 508  * Waits for the object to be signaled (using vlc_object_signal()).
 509  * If the object already has a signal pending, this function will return
 510  * immediately. It is asserted that the caller holds the object lock.
 511  *
 512  * @return true if the object is dying and should terminate.
 513  */
 514 vlc_bool_t __vlc_object_wait( vlc_object_t *obj )
 515 {
 516     vlc_assert_locked( &obj->object_lock );
 517
 518     int fd = obj->p_internals->pipes[0];
 519     if( fd != -1 )
 520     {
 521         if( read( fd, &(char){ 0 }, 1 ) == 0 )
 522         {
 523             close( fd );
 524             obj->p_internals->pipes[1] = -1;
 525         }
 526         return obj->b_die;
 527     }
 528
 529     vlc_cond_wait( &obj->object_wait, &obj->object_lock );
 530     return obj->b_die;
 531 }
 532
 533
 534 /**
 535  * Waits for the object to be signaled (using vlc_object_signal()), or for
 536  * a timer to expire.
 537  * If the object already has a signal pending, this function will return
 538  * immediately. It is asserted that the caller holds the object lock.
 539  *
 540  * @return negative if the object is dying and should terminate,
 541  * positive if the the object has been signaled but is not dying,
 542  * 0 if timeout has been reached.
 543  */
 544 int __vlc_object_timedwait( vlc_object_t *obj, mtime_t deadline )
 545 {
 546     int v;
 547
 548     vlc_assert_locked( &obj->object_lock );
 549     v = vlc_cond_timedwait( &obj->object_wait, &obj->object_lock, deadline );
 550     if( v == 0 ) /* signaled */
 551         return obj->b_die ? -1 : 1;
 552     return 0;
 553 }
 554
 555
 556 /**
 557  * Checks whether an object has been "killed".
 558  * The object lock must be held.
 559  *
 560  * Typical code for an object thread could be:
 561  *
 562    vlc_object_lock (self);
 563    ...initialization...
 564    while (vlc_object_alive (self))
 565    {
 566        ...preprocessing...
 567
 568        if (vlc_object_wait (self))
 569            continue;
 570
 571        ...postprocessing...
 572    }
 573    ...deinitialization...
 574    vlc_object_unlock (self);
 575  *
 576  *
 577  * @return true iff the object has not been killed yet
 578  */
 579 vlc_bool_t __vlc_object_alive( vlc_object_t *obj )
 580 {
 581     vlc_assert_locked( &obj->object_lock );
 582     return !obj->b_die;
 583 }
 584
 585
 586 /**
 587  * Signals an object for which the lock is held.
 588  */
 589 void __vlc_object_signal_unlocked( vlc_object_t *obj )
 590 {
 591     vlc_assert_locked( &obj->object_lock );
 592
 593     int fd = obj->p_internals->pipes[1];
 594     if( fd != -1 )
 595         while( write( fd, &(char){ 0 }, 1 ) < 0 );
 596
 597     vlc_cond_signal( &obj->object_wait );
 598 }
 599
 600
 601 /**
 602  * Requests termination of an object.
 603  * If the object is LibVLC, also request to terminate all its children.
 604  */
 605 void __vlc_object_kill( vlc_object_t *p_this )
 606 {
 607     vlc_mutex_lock( &p_this->object_lock );
 608     p_this->b_die = VLC_TRUE;
 609
 610     if( p_this->i_object_type == VLC_OBJECT_LIBVLC )
 611         for( int i = 0; i < p_this->i_children ; i++ )
 612             vlc_object_kill( p_this->pp_children[i] );
 613
 614     int fd = p_this->p_internals->pipes[1];
 615     if( fd != -1 )
 616     {
 617         close( fd ); /* closing a pipe makes it readable too */
 618         p_this->p_internals->pipes[1] = -1;
 619     }
 620
 621     vlc_object_signal_unlocked( p_this );
 622     vlc_mutex_unlock( &p_this->object_lock );
 623 }
 624
 625
 626 /**
 627  * find an object given its ID
 628  *
 629  * This function looks for the object whose i_object_id field is i_id. We
 630  * use a dichotomy so that lookups are in log2(n).
 631  *****************************************************************************/
 632 void * __vlc_object_get( vlc_object_t *p_this, int i_id )
 633 {
 634     int i_max, i_middle;
 635     vlc_object_t **pp_objects;
 636     libvlc_global_data_t *p_libvlc_global = vlc_global();
 637
 638     vlc_mutex_lock( &structure_lock );
 639
 640     pp_objects = p_libvlc_global->pp_objects;
 641
 642     /* Perform our dichotomy */
 643     for( i_max = p_libvlc_global->i_objects - 1 ; ; )
 644     {
 645         i_middle = i_max / 2;
 646
 647         if( pp_objects[i_middle]->i_object_id > i_id )
 648         {
 649             i_max = i_middle;
 650         }
 651         else if( pp_objects[i_middle]->i_object_id < i_id )
 652         {
 653             if( i_middle )
 654             {
 655                 pp_objects += i_middle;
 656                 i_max -= i_middle;
 657             }
 658             else
 659             {
 660                 /* This happens when there are only two remaining objects */
 661                 if( pp_objects[i_middle+1]->i_object_id == i_id )
 662                 {
 663                     vlc_mutex_unlock( &structure_lock );
 664                     pp_objects[i_middle+1]->p_internals->i_refcount++;
 665                     return pp_objects[i_middle+1];
 666                 }
 667                 break;
 668             }
 669         }
 670         else
 671         {
 672             vlc_mutex_unlock( &structure_lock );
 673             pp_objects[i_middle]->p_internals->i_refcount++;
 674             return pp_objects[i_middle];
 675         }
 676
 677         if( i_max == 0 )
 678         {
 679             /* this means that i_max == i_middle, and since we have already
 680              * tested pp_objects[i_middle]), p_found is properly set. */
 681             break;
 682         }
 683     }
 684
 685     vlc_mutex_unlock( &structure_lock );
 686     return NULL;
 687 }
 688
 689 /**
 690  ****************************************************************************
 691  * find a typed object and increment its refcount
 692  *****************************************************************************
 693  * This function recursively looks for a given object type. i_mode can be one
 694  * of FIND_PARENT, FIND_CHILD or FIND_ANYWHERE.
 695  *****************************************************************************/
 696 void * __vlc_object_find( vlc_object_t *p_this, int i_type, int i_mode )
 697 {
 698     vlc_object_t *p_found;
 699
 700     vlc_mutex_lock( &structure_lock );
 701
 702     /* If we are of the requested type ourselves, don't look further */
 703     if( !(i_mode & FIND_STRICT) && p_this->i_object_type == i_type )
 704     {
 705         p_this->p_internals->i_refcount++;
 706         vlc_mutex_unlock( &structure_lock );
 707         return p_this;
 708     }
 709
 710     /* Otherwise, recursively look for the object */
 711     if( (i_mode & 0x000f) == FIND_ANYWHERE )
 712     {
 713         vlc_object_t *p_root = p_this;
 714
 715         /* Find the root */
 716         while( p_root->p_parent != NULL &&
 717                p_root != VLC_OBJECT( p_this->p_libvlc ) )
 718         {
 719             p_root = p_root->p_parent;
 720         }
 721
 722         p_found = FindObject( p_root, i_type, (i_mode & ~0x000f)|FIND_CHILD );
 723         if( p_found == NULL && p_root != VLC_OBJECT( p_this->p_libvlc ) )
 724         {
 725             p_found = FindObject( VLC_OBJECT( p_this->p_libvlc ),
 726                                   i_type, (i_mode & ~0x000f)|FIND_CHILD );
 727         }
 728     }
 729     else
 730     {
 731         p_found = FindObject( p_this, i_type, i_mode );
 732     }
 733
 734     vlc_mutex_unlock( &structure_lock );
 735
 736     return p_found;
 737 }
 738
 739 /**
 740  ****************************************************************************
 741  * find a named object and increment its refcount
 742  *****************************************************************************
 743  * This function recursively looks for a given object name. i_mode can be one
 744  * of FIND_PARENT, FIND_CHILD or FIND_ANYWHERE.
 745  *****************************************************************************/
 746 void * __vlc_object_find_name( vlc_object_t *p_this, const char *psz_name,
 747                                int i_mode )
 748 {
 749     vlc_object_t *p_found;
 750
 751     vlc_mutex_lock( &structure_lock );
 752
 753     /* If have the requested name ourselves, don't look further */
 754     if( !(i_mode & FIND_STRICT)
 755         && p_this->psz_object_name
 756         && !strcmp( p_this->psz_object_name, psz_name ) )
 757     {
 758         p_this->p_internals->i_refcount++;
 759         vlc_mutex_unlock( &structure_lock );
 760         return p_this;
 761     }
 762
 763     /* Otherwise, recursively look for the object */
 764     if( (i_mode & 0x000f) == FIND_ANYWHERE )
 765     {
 766         vlc_object_t *p_root = p_this;
 767
 768         /* Find the root */
 769         while( p_root->p_parent != NULL &&
 770                p_root != VLC_OBJECT( p_this->p_libvlc ) )
 771         {
 772             p_root = p_root->p_parent;
 773         }
 774
 775         p_found = FindObjectName( p_root, psz_name,
 776                                  (i_mode & ~0x000f)|FIND_CHILD );
 777         if( p_found == NULL && p_root != VLC_OBJECT( p_this->p_libvlc ) )
 778         {
 779             p_found = FindObjectName( VLC_OBJECT( p_this->p_libvlc ),
 780                                       psz_name, (i_mode & ~0x000f)|FIND_CHILD );
 781         }
 782     }
 783     else
 784     {
 785         p_found = FindObjectName( p_this, psz_name, i_mode );
 786     }
 787
 788     vlc_mutex_unlock( &structure_lock );
 789
 790     return p_found;
 791 }
 792
 793 /**
 794  ****************************************************************************
 795  * increment an object refcount
 796  *****************************************************************************/
 797 void __vlc_object_yield( vlc_object_t *p_this )
 798 {
 799     vlc_mutex_lock( &structure_lock );
 800     p_this->p_internals->i_refcount++;
 801     vlc_mutex_unlock( &structure_lock );
 802 }
 803
 804 static inline void Release( vlc_object_t *obj )
 805 {
 806     assert( obj->p_internals->i_refcount > 0 );
 807     obj->p_internals->i_refcount--;
 808 }
 809
 810 /*****************************************************************************
 811  * decrement an object refcount
 812  *****************************************************************************/
 813 void __vlc_object_release( vlc_object_t *p_this )
 814 {
 815     vlc_mutex_lock( &structure_lock );
 816     Release( p_this );
 817     vlc_mutex_unlock( &structure_lock );
 818 }
 819
 820 /**
 821  ****************************************************************************
 822  * attach object to a parent object
 823  *****************************************************************************
 824  * This function sets p_this as a child of p_parent, and p_parent as a parent
 825  * of p_this. This link can be undone using vlc_object_detach.
 826  *****************************************************************************/
 827 void __vlc_object_attach( vlc_object_t *p_this, vlc_object_t *p_parent )
 828 {
 829     if( !p_this ) return;
 830
 831     vlc_mutex_lock( &structure_lock );
 832
 833     /* Attach the parent to its child */
 834     p_this->p_parent = p_parent;
 835
 836     /* Attach the child to its parent */
 837     INSERT_ELEM( p_parent->pp_children, p_parent->i_children,
 838                  p_parent->i_children, p_this );
 839
 840     /* Climb up the tree to see whether we are connected with the root */
 841     if( p_parent->p_internals->b_attached )
 842     {
 843         SetAttachment( p_this, VLC_TRUE );
 844     }
 845
 846     vlc_mutex_unlock( &structure_lock );
 847 }
 848
 849 /**
 850  ****************************************************************************
 851  * detach object from its parent
 852  *****************************************************************************
 853  * This function removes all links between an object and its parent.
 854  *****************************************************************************/
 855 void __vlc_object_detach( vlc_object_t *p_this )
 856 {
 857     if( !p_this ) return;
 858
 859     vlc_mutex_lock( &structure_lock );
 860     if( !p_this->p_parent )
 861     {
 862         msg_Err( p_this, "object is not attached" );
 863         vlc_mutex_unlock( &structure_lock );
 864         return;
 865     }
 866
 867     /* Climb up the tree to see whether we are connected with the root */
 868     if( p_this->p_parent->p_internals->b_attached )
 869     {
 870         SetAttachment( p_this, VLC_FALSE );
 871     }
 872
 873     DetachObject( p_this );
 874     vlc_mutex_unlock( &structure_lock );
 875     p_this = NULL;
 876 }
 877
 878 /**
 879  ****************************************************************************
 880  * find a list typed objects and increment their refcount
 881  *****************************************************************************
 882  * This function recursively looks for a given object type. i_mode can be one
 883  * of FIND_PARENT, FIND_CHILD or FIND_ANYWHERE.
 884  *****************************************************************************/
 885 vlc_list_t * __vlc_list_find( vlc_object_t *p_this, int i_type, int i_mode )
 886 {
 887     vlc_list_t *p_list;
 888     vlc_object_t **pp_current, **pp_end;
 889     int i_count = 0, i_index = 0;
 890     libvlc_global_data_t *p_libvlc_global = vlc_global();
 891
 892     vlc_mutex_lock( &structure_lock );
 893
 894     /* Look for the objects */
 895     switch( i_mode & 0x000f )
 896     {
 897     case FIND_ANYWHERE:
 898         pp_current = p_libvlc_global->pp_objects;
 899         pp_end = pp_current + p_libvlc_global->i_objects;
 900
 901         for( ; pp_current < pp_end ; pp_current++ )
 902         {
 903             if( (*pp_current)->p_internals->b_attached
 904                  && (*pp_current)->i_object_type == i_type )
 905             {
 906                 i_count++;
 907             }
 908         }
 909
 910         p_list = NewList( i_count );
 911         pp_current = p_libvlc_global->pp_objects;
 912
 913         for( ; pp_current < pp_end ; pp_current++ )
 914         {
 915             if( (*pp_current)->p_internals->b_attached
 916                  && (*pp_current)->i_object_type == i_type )
 917             {
 918                 ListReplace( p_list, *pp_current, i_index );
 919                 if( i_index < i_count ) i_index++;
 920             }
 921         }
 922     break;
 923
 924     case FIND_CHILD:
 925         i_count = CountChildren( p_this, i_type );
 926         p_list = NewList( i_count );
 927
 928         /* Check allocation was successful */
 929         if( p_list->i_count != i_count )
 930         {
 931             msg_Err( p_this, "list allocation failed!" );
 932             p_list->i_count = 0;
 933             break;
 934         }
 935
 936         p_list->i_count = 0;
 937         ListChildren( p_list, p_this, i_type );
 938         break;
 939
 940     default:
 941         msg_Err( p_this, "unimplemented!" );
 942         p_list = NewList( 0 );
 943         break;
 944     }
 945
 946     vlc_mutex_unlock( &structure_lock );
 947
 948     return p_list;
 949 }
 950
 951 /*****************************************************************************
 952  * DumpCommand: print the current vlc structure
 953  *****************************************************************************
 954  * This function prints either an ASCII tree showing the connections between
 955  * vlc objects, and additional information such as their refcount, thread ID,
 956  * etc. (command "tree"), or the same data as a simple list (command "list").
 957  *****************************************************************************/
 958 static int DumpCommand( vlc_object_t *p_this, char const *psz_cmd,
 959                         vlc_value_t oldval, vlc_value_t newval, void *p_data )
 960 {
 961     libvlc_global_data_t *p_libvlc_global = vlc_global();
 962
 963     (void)oldval; (void)p_data;
 964     if( *psz_cmd == 'l' )
 965     {
 966         vlc_mutex_lock( &structure_lock );
 967
 968         vlc_object_t **pp_current, **pp_end;
 969
 970         pp_current = p_libvlc_global->pp_objects;
 971         pp_end = pp_current + p_libvlc_global->i_objects;
 972
 973         for( ; pp_current < pp_end ; pp_current++ )
 974         {
 975             if( (*pp_current)->p_internals->b_attached )
 976             {
 977                 PrintObject( *pp_current, "" );
 978             }
 979             else
 980             {
 981                 printf( " o %.8i %s (not attached)\n",
 982                         (*pp_current)->i_object_id,
 983                         (*pp_current)->psz_object_type );
 984             }
 985         }
 986
 987         vlc_mutex_unlock( &structure_lock );
 988     }
 989     else
 990     {
 991         vlc_object_t *p_object = NULL;
 992
 993         if( *newval.psz_string )
 994         {
 995             char *end;
 996             int i_id = strtol( newval.psz_string, &end, 0 );
 997             if( end != newval.psz_string )
 998                 p_object = vlc_object_get( p_this, i_id );
 999             else
1000             {
1001                 /* try using the object's name to find it */
1002                 vlc_object_t *p_libvlc = vlc_object_get( p_this, 1 );
1003                 if( p_libvlc )
1004                 {
1005                     /* Look in p_libvlc's children tree */
1006                     p_object = vlc_object_find_name( p_libvlc,
1007                                                      newval.psz_string,
1008                                                      FIND_CHILD );
1009                     vlc_object_release( p_libvlc );
1010                 }
1011                 if( !p_object )
1012                 {
1013                     /* If it's not in libvlc, look in libvlc_global (== p_this) */
1014                     p_object = vlc_object_find_name( p_this,
1015                                                      newval.psz_string,
1016                                                      FIND_CHILD );
1017                 }
1018             }
1019
1020             if( !p_object )
1021             {
1022                 return VLC_ENOOBJ;
1023             }
1024         }
1025
1026         vlc_mutex_lock( &structure_lock );
1027
1028         if( *psz_cmd == 't' )
1029         {
1030             char psz_foo[2 * MAX_DUMPSTRUCTURE_DEPTH + 1];
1031
1032             if( !p_object )
1033                 p_object = p_this->p_libvlc ? VLC_OBJECT(p_this->p_libvlc) : p_this;
1034
1035             psz_foo[0] = '|';
1036             DumpStructure( p_object, 0, psz_foo );
1037         }
1038         else if( *psz_cmd == 'v' )
1039         {
1040             int i;
1041
1042             if( !p_object )
1043                 p_object = p_this->p_libvlc ? VLC_OBJECT(p_this->p_libvlc) : p_this;
1044
1045             PrintObject( p_object, "" );
1046
1047             if( !p_object->p_internals->i_vars )
1048                 printf( " `-o No variables\n" );
1049             for( i = 0; i < p_object->p_internals->i_vars; i++ )
1050             {
1051                 variable_t *p_var = p_object->p_internals->p_vars + i;
1052
1053                 const char *psz_type = "unknown";
1054                 switch( p_var->i_type & VLC_VAR_TYPE )
1055                 {
1056 #define MYCASE( type, nice )                \
1057                     case VLC_VAR_ ## type:  \
1058                         psz_type = nice;    \
1059                         break;
1060                     MYCASE( VOID, "void" );
1061                     MYCASE( BOOL, "bool" );
1062                     MYCASE( INTEGER, "integer" );
1063                     MYCASE( HOTKEY, "hotkey" );
1064                     MYCASE( STRING, "string" );
1065                     MYCASE( MODULE, "module" );
1066                     MYCASE( FILE, "file" );
1067                     MYCASE( DIRECTORY, "directory" );
1068                     MYCASE( VARIABLE, "variable" );
1069                     MYCASE( FLOAT, "float" );
1070                     MYCASE( TIME, "time" );
1071                     MYCASE( ADDRESS, "address" );
1072                     MYCASE( MUTEX, "mutex" );
1073                     MYCASE( LIST, "list" );
1074 #undef MYCASE
1075                 }
1076                 printf( " %c-o \"%s\" (%s",
1077                         i + 1 == p_object->p_internals->i_vars ? '`' : '|',
1078                         p_var->psz_name, psz_type );
1079                 if( p_var->psz_text )
1080                     printf( ", %s", p_var->psz_text );
1081                 printf( ")" );
1082                 if( p_var->i_type & VLC_VAR_ISCOMMAND )
1083                     printf( ", command" );
1084                 if( p_var->i_entries )
1085                     printf( ", %d callbacks", p_var->i_entries );
1086                 switch( p_var->i_type & 0x00f0 )
1087                 {
1088                     case VLC_VAR_VOID:
1089                     case VLC_VAR_MUTEX:
1090                         break;
1091                     case VLC_VAR_BOOL:
1092                         printf( ": %s", p_var->val.b_bool ? "true" : "false" );
1093                         break;
1094                     case VLC_VAR_INTEGER:
1095                         printf( ": %d", p_var->val.i_int );
1096                         break;
1097                     case VLC_VAR_STRING:
1098                         printf( ": \"%s\"", p_var->val.psz_string );
1099                         break;
1100                     case VLC_VAR_FLOAT:
1101                         printf( ": %f", p_var->val.f_float );
1102                         break;
1103                     case VLC_VAR_TIME:
1104                         printf( ": " I64Fi, (int64_t)p_var->val.i_time );
1105                         break;
1106                     case VLC_VAR_ADDRESS:
1107                         printf( ": %p", p_var->val.p_address );
1108                         break;
1109                     case VLC_VAR_LIST:
1110                         printf( ": TODO" );
1111                         break;
1112                 }
1113                 printf( "\n" );
1114             }
1115         }
1116
1117         vlc_mutex_unlock( &structure_lock );
1118
1119         if( *newval.psz_string )
1120         {
1121             vlc_object_release( p_object );
1122         }
1123     }
1124
1125     return VLC_SUCCESS;
1126 }
1127
1128 /*****************************************************************************
1129  * vlc_list_release: free a list previously allocated by vlc_list_find
1130  *****************************************************************************
1131  * This function decreases the refcount of all objects in the list and
1132  * frees the list.
1133  *****************************************************************************/
1134 void vlc_list_release( vlc_list_t *p_list )
1135 {
1136     int i_index;
1137
1138     vlc_mutex_lock( &structure_lock );
1139     for( i_index = 0; i_index < p_list->i_count; i_index++ )
1140     {
1141         Release( p_list->p_values[i_index].p_object );
1142     }
1143     vlc_mutex_unlock( &structure_lock );
1144
1145     free( p_list->p_values );
1146     free( p_list );
1147 }
1148
1149 /* Following functions are local */
1150
1151 /*****************************************************************************
1152  * FindIndex: find the index of an object in an array of objects
1153  *****************************************************************************
1154  * This function assumes that p_this can be found in pp_objects. It will not
1155  * crash if p_this cannot be found, but will return a wrong value. It is your
1156  * duty to check the return value if you are not certain that the object could
1157  * be found for sure.
1158  *****************************************************************************/
1159 static int FindIndex( vlc_object_t *p_this,
1160                       vlc_object_t **pp_objects, int i_count )
1161 {
1162     int i_middle = i_count / 2;
1163
1164     if( i_count == 0 )
1165     {
1166         return 0;
1167     }
1168
1169     if( pp_objects[i_middle] == p_this )
1170     {
1171         return i_middle;
1172     }
1173
1174     if( i_count == 1 )
1175     {
1176         return 0;
1177     }
1178
1179     /* We take advantage of the sorted array */
1180     if( pp_objects[i_middle]->i_object_id < p_this->i_object_id )
1181     {
1182         return i_middle + FindIndex( p_this, pp_objects + i_middle,
1183                                              i_count - i_middle );
1184     }
1185     else
1186     {
1187         return FindIndex( p_this, pp_objects, i_middle );
1188     }
1189 }
1190
1191 static vlc_object_t * FindObject( vlc_object_t *p_this, int i_type, int i_mode )
1192 {
1193     int i;
1194     vlc_object_t *p_tmp;
1195
1196     switch( i_mode & 0x000f )
1197     {
1198     case FIND_PARENT:
1199         p_tmp = p_this->p_parent;
1200         if( p_tmp )
1201         {
1202             if( p_tmp->i_object_type == i_type )
1203             {
1204                 p_tmp->p_internals->i_refcount++;
1205                 return p_tmp;
1206             }
1207             else
1208             {
1209                 return FindObject( p_tmp, i_type, i_mode );
1210             }
1211         }
1212         break;
1213
1214     case FIND_CHILD:
1215         for( i = p_this->i_children; i--; )
1216         {
1217             p_tmp = p_this->pp_children[i];
1218             if( p_tmp->i_object_type == i_type )
1219             {
1220                 p_tmp->p_internals->i_refcount++;
1221                 return p_tmp;
1222             }
1223             else if( p_tmp->i_children )
1224             {
1225                 p_tmp = FindObject( p_tmp, i_type, i_mode );
1226                 if( p_tmp )
1227                 {
1228                     return p_tmp;
1229                 }
1230             }
1231         }
1232         break;
1233
1234     case FIND_ANYWHERE:
1235         /* Handled in vlc_object_find */
1236         break;
1237     }
1238
1239     return NULL;
1240 }
1241
1242 static vlc_object_t * FindObjectName( vlc_object_t *p_this,
1243                                       const char *psz_name,
1244                                       int i_mode )
1245 {
1246     int i;
1247     vlc_object_t *p_tmp;
1248
1249     switch( i_mode & 0x000f )
1250     {
1251     case FIND_PARENT:
1252         p_tmp = p_this->p_parent;
1253         if( p_tmp )
1254         {
1255             if( p_tmp->psz_object_name
1256                 && !strcmp( p_tmp->psz_object_name, psz_name ) )
1257             {
1258                 p_tmp->p_internals->i_refcount++;
1259                 return p_tmp;
1260             }
1261             else
1262             {
1263                 return FindObjectName( p_tmp, psz_name, i_mode );
1264             }
1265         }
1266         break;
1267
1268     case FIND_CHILD:
1269         for( i = p_this->i_children; i--; )
1270         {
1271             p_tmp = p_this->pp_children[i];
1272             if( p_tmp->psz_object_name
1273                 && !strcmp( p_tmp->psz_object_name, psz_name ) )
1274             {
1275                 p_tmp->p_internals->i_refcount++;
1276                 return p_tmp;
1277             }
1278             else if( p_tmp->i_children )
1279             {
1280                 p_tmp = FindObjectName( p_tmp, psz_name, i_mode );
1281                 if( p_tmp )
1282                 {
1283                     return p_tmp;
1284                 }
1285             }
1286         }
1287         break;
1288
1289     case FIND_ANYWHERE:
1290         /* Handled in vlc_object_find */
1291         break;
1292     }
1293
1294     return NULL;
1295 }
1296
1297 static void DetachObject( vlc_object_t *p_this )
1298 {
1299     vlc_object_t *p_parent = p_this->p_parent;
1300     int i_index, i;
1301
1302     /* Remove p_this's parent */
1303     p_this->p_parent = NULL;
1304
1305     /* Remove all of p_parent's children which are p_this */
1306     for( i_index = p_parent->i_children ; i_index-- ; )
1307     {
1308         if( p_parent->pp_children[i_index] == p_this )
1309         {
1310             p_parent->i_children--;
1311             for( i = i_index ; i < p_parent->i_children ; i++ )
1312             {
1313                 p_parent->pp_children[i] = p_parent->pp_children[i+1];
1314             }
1315         }
1316     }
1317
1318     if( p_parent->i_children )
1319     {
1320         p_parent->pp_children = (vlc_object_t **)realloc( p_parent->pp_children,
1321                                p_parent->i_children * sizeof(vlc_object_t *) );
1322     }
1323     else
1324     {
1325         free( p_parent->pp_children );
1326         p_parent->pp_children = NULL;
1327     }
1328 }
1329
1330 /*****************************************************************************
1331  * SetAttachment: recursively set the b_attached flag of a subtree.
1332  *****************************************************************************
1333  * This function is used by the attach and detach functions to propagate
1334  * the b_attached flag in a subtree.
1335  *****************************************************************************/
1336 static void SetAttachment( vlc_object_t *p_this, vlc_bool_t b_attached )
1337 {
1338     int i_index;
1339
1340     for( i_index = p_this->i_children ; i_index-- ; )
1341     {
1342         SetAttachment( p_this->pp_children[i_index], b_attached );
1343     }
1344
1345     p_this->p_internals->b_attached = b_attached;
1346 }
1347
1348 static void PrintObject( vlc_object_t *p_this, const char *psz_prefix )
1349 {
1350     char psz_children[20], psz_refcount[20], psz_thread[30], psz_name[50],
1351          psz_parent[20];
1352
1353     psz_name[0] = '\0';
1354     if( p_this->psz_object_name )
1355     {
1356         snprintf( psz_name, 49, " \"%s\"", p_this->psz_object_name );
1357         if( psz_name[48] )
1358             psz_name[48] = '\"';
1359     }
1360
1361     psz_children[0] = '\0';
1362     switch( p_this->i_children )
1363     {
1364         case 0:
1365             break;
1366         case 1:
1367             strcpy( psz_children, ", 1 child" );
1368             break;
1369         default:
1370             snprintf( psz_children, 19, ", %i children", p_this->i_children );
1371             break;
1372     }
1373
1374     psz_refcount[0] = '\0';
1375     if( p_this->p_internals->i_refcount > 0 )
1376         snprintf( psz_refcount, 19, ", refcount %u",
1377                   p_this->p_internals->i_refcount );
1378
1379     psz_thread[0] = '\0';
1380     if( p_this->p_internals->b_thread )
1381         snprintf( psz_thread, 29, " (thread %u)",
1382 #if defined(WIN32) || defined(UNDER_CE)
1383                   (unsigned)p_this->p_internals->thread_id.id );
1384 #else
1385                   (unsigned)p_this->p_internals->thread_id );
1386 #endif
1387
1388     psz_parent[0] = '\0';
1389     if( p_this->p_parent )
1390         snprintf( psz_parent, 19, ", parent %i", p_this->p_parent->i_object_id );
1391
1392     printf( " %so %.8i %s%s%s%s%s%s\n", psz_prefix,
1393             p_this->i_object_id, p_this->psz_object_type,
1394             psz_name, psz_thread, psz_refcount, psz_children,
1395             psz_parent );
1396 }
1397
1398 static void DumpStructure( vlc_object_t *p_this, int i_level, char *psz_foo )
1399 {
1400     int i;
1401     char i_back = psz_foo[i_level];
1402     psz_foo[i_level] = '\0';
1403
1404     PrintObject( p_this, psz_foo );
1405
1406     psz_foo[i_level] = i_back;
1407
1408     if( i_level / 2 >= MAX_DUMPSTRUCTURE_DEPTH )
1409     {
1410         msg_Warn( p_this, "structure tree is too deep" );
1411         return;
1412     }
1413
1414     for( i = 0 ; i < p_this->i_children ; i++ )
1415     {
1416         if( i_level )
1417         {
1418             psz_foo[i_level-1] = ' ';
1419
1420             if( psz_foo[i_level-2] == '`' )
1421             {
1422                 psz_foo[i_level-2] = ' ';
1423             }
1424         }
1425
1426         if( i == p_this->i_children - 1 )
1427         {
1428             psz_foo[i_level] = '`';
1429         }
1430         else
1431         {
1432             psz_foo[i_level] = '|';
1433         }
1434
1435         psz_foo[i_level+1] = '-';
1436         psz_foo[i_level+2] = '\0';
1437
1438         DumpStructure( p_this->pp_children[i], i_level + 2, psz_foo );
1439     }
1440 }
1441
1442 static vlc_list_t * NewList( int i_count )
1443 {
1444     vlc_list_t * p_list = (vlc_list_t *)malloc( sizeof( vlc_list_t ) );
1445     if( p_list == NULL )
1446     {
1447         return NULL;
1448     }
1449
1450     p_list->i_count = i_count;
1451
1452     if( i_count == 0 )
1453     {
1454         p_list->p_values = NULL;
1455         return p_list;
1456     }
1457
1458     p_list->p_values = malloc( i_count * sizeof( vlc_value_t ) );
1459     if( p_list->p_values == NULL )
1460     {
1461         p_list->i_count = 0;
1462         return p_list;
1463     }
1464
1465     return p_list;
1466 }
1467
1468 static void ListReplace( vlc_list_t *p_list, vlc_object_t *p_object,
1469                          int i_index )
1470 {
1471     if( p_list == NULL || i_index >= p_list->i_count )
1472     {
1473         return;
1474     }
1475
1476     p_object->p_internals->i_refcount++;
1477
1478     p_list->p_values[i_index].p_object = p_object;
1479
1480     return;
1481 }
1482
1483 /*static void ListAppend( vlc_list_t *p_list, vlc_object_t *p_object )
1484 {
1485     if( p_list == NULL )
1486     {
1487         return;
1488     }
1489
1490     p_list->p_values = realloc( p_list->p_values, (p_list->i_count + 1)
1491                                 * sizeof( vlc_value_t ) );
1492     if( p_list->p_values == NULL )
1493     {
1494         p_list->i_count = 0;
1495         return;
1496     }
1497
1498     p_object->p_internals->i_refcount++;
1499
1500     p_list->p_values[p_list->i_count].p_object = p_object;
1501     p_list->i_count++;
1502
1503     return;
1504 }*/
1505
1506 static int CountChildren( vlc_object_t *p_this, int i_type )
1507 {
1508     vlc_object_t *p_tmp;
1509     int i, i_count = 0;
1510
1511     for( i = 0; i < p_this->i_children; i++ )
1512     {
1513         p_tmp = p_this->pp_children[i];
1514
1515         if( p_tmp->i_object_type == i_type )
1516         {
1517             i_count++;
1518         }
1519
1520         if( p_tmp->i_children )
1521         {
1522             i_count += CountChildren( p_tmp, i_type );
1523         }
1524     }
1525
1526     return i_count;
1527 }
1528
1529 static void ListChildren( vlc_list_t *p_list, vlc_object_t *p_this, int i_type )
1530 {
1531     vlc_object_t *p_tmp;
1532     int i;
1533
1534     for( i = 0; i < p_this->i_children; i++ )
1535     {
1536         p_tmp = p_this->pp_children[i];
1537
1538         if( p_tmp->i_object_type == i_type )
1539         {
1540             ListReplace( p_list, p_tmp, p_list->i_count++ );
1541         }
1542
1543         if( p_tmp->i_children )
1544         {
1545             ListChildren( p_list, p_tmp, i_type );
1546         }
1547     }
1548 }