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

   1 /*****************************************************************************
   2  * objects.c: vlc_object_t handling
   3  *****************************************************************************
   4  * Copyright (C) 2004-2007 the VideoLAN team
   5  * $Id$
   6  *
   7  * Authors: Samuel Hocevar <sam@zoy.org>
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; either version 2 of the License, or
  12  * (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, write to the Free Software
  21  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
  22  *****************************************************************************/
  23
  24 /**
  25  * \file
  26  * This file contains the functions to handle the vlc_object_t type
  27  */
  28
  29
  30 /*****************************************************************************
  31  * Preamble
  32  *****************************************************************************/
  33 #include <vlc/vlc.h>
  34
  35 #include "../libvlc.h"
  36 #include <vlc_vout.h>
  37 #include <vlc_aout.h>
  38 #include "audio_output/aout_internal.h"
  39
  40 #include <vlc_access.h>
  41 #include <vlc_demux.h>
  42 #include <vlc_stream.h>
  43
  44 #include <vlc_sout.h>
  45 #include "stream_output/stream_output.h"
  46
  47 #include "vlc_playlist.h"
  48 #include "vlc_interface.h"
  49 #include "vlc_codec.h"
  50 #include "vlc_filter.h"
  51
  52 #include "vlc_httpd.h"
  53 #include "vlc_vlm.h"
  54 #include "input/vlm_internal.h"
  55 #include "vlc_vod.h"
  56 #include "vlc_tls.h"
  57 #include "vlc_xml.h"
  58 #include "vlc_osd.h"
  59 #include "vlc_meta.h"
  60
  61 #include "variables.h"
  62 #ifndef WIN32
  63 # include <unistd.h>
  64 #else
  65 # include <io.h>
  66 # include <fcntl.h>
  67 #endif
  68
  69 /*****************************************************************************
  70  * Local prototypes
  71  *****************************************************************************/
  72 static int  DumpCommand( vlc_object_t *, char const *,
  73                          vlc_value_t, vlc_value_t, void * );
  74
  75 static vlc_object_t * FindObject    ( vlc_object_t *, int, int );
  76 static vlc_object_t * FindObjectName( vlc_object_t *, const char *, int );
  77 static void           DetachObject  ( vlc_object_t * );
  78 static void           PrintObject   ( vlc_object_t *, const char * );
  79 static void           DumpStructure ( vlc_object_t *, int, char * );
  80 static int            FindIndex     ( vlc_object_t *, vlc_object_t **, int );
  81 static void           SetAttachment ( vlc_object_t *, vlc_bool_t );
  82
  83 static vlc_list_t   * NewList       ( int );
  84 static void           ListReplace   ( vlc_list_t *, vlc_object_t *, int );
  85 /*static void           ListAppend    ( vlc_list_t *, vlc_object_t * );*/
  86 static int            CountChildren ( vlc_object_t *, int );
  87 static void           ListChildren  ( vlc_list_t *, vlc_object_t *, int );
  88
  89 /*****************************************************************************
  90  * Local structure lock
  91  *****************************************************************************/
  92 static vlc_mutex_t    structure_lock;
  93 static vlc_object_internals_t global_internals;
  94
  95 vlc_object_t *vlc_custom_create( vlc_object_t *p_this, size_t i_size,
  96                                  int i_type, const char *psz_type )
  97 {
  98     vlc_object_t *p_new;
  99     vlc_object_internals_t *p_priv;
 100
 101     if( i_type == VLC_OBJECT_GLOBAL )
 102     {
 103         p_new = p_this;
 104         p_priv = &global_internals;
 105         memset( p_priv, 0, sizeof( *p_priv ) );
 106     }
 107     else
 108     {
 109         p_priv = calloc( 1, sizeof( *p_priv ) + i_size );
 110         if( p_priv == NULL )
 111             return NULL;
 112
 113         p_new = (vlc_object_t *)(p_priv + 1);
 114     }
 115
 116     p_new->p_internals = p_priv;
 117     p_new->i_object_type = i_type;
 118     p_new->psz_object_type = psz_type;
 119
 120     p_new->psz_object_name = NULL;
 121
 122     p_new->b_die = VLC_FALSE;
 123     p_new->b_error = VLC_FALSE;
 124     p_new->b_dead = VLC_FALSE;
 125     p_priv->b_attached = VLC_FALSE;
 126     p_new->b_force = VLC_FALSE;
 127
 128     p_new->psz_header = NULL;
 129
 130     if( p_this->i_flags & OBJECT_FLAGS_NODBG )
 131         p_new->i_flags |= OBJECT_FLAGS_NODBG;
 132     if( p_this->i_flags & OBJECT_FLAGS_QUIET )
 133         p_new->i_flags |= OBJECT_FLAGS_QUIET;
 134     if( p_this->i_flags & OBJECT_FLAGS_NOINTERACT )
 135         p_new->i_flags |= OBJECT_FLAGS_NOINTERACT;
 136
 137     p_priv->p_vars = calloc( sizeof( variable_t ), 16 );
 138
 139     if( !p_priv->p_vars )
 140     {
 141         if( i_type != VLC_OBJECT_GLOBAL )
 142             free( p_priv );
 143         return NULL;
 144     }
 145
 146     if( i_type == VLC_OBJECT_GLOBAL )
 147     {
 148         /* If i_type is global, then p_new is actually p_libvlc_global */
 149         libvlc_global_data_t *p_libvlc_global = (libvlc_global_data_t *)p_new;
 150         p_new->p_libvlc = NULL;
 151
 152         p_libvlc_global->i_counter = 0;
 153         p_new->i_object_id = 0;
 154
 155         p_libvlc_global->i_objects = 1;
 156         p_libvlc_global->pp_objects = malloc( sizeof(vlc_object_t *) );
 157         p_libvlc_global->pp_objects[0] = p_new;
 158         p_priv->b_attached = VLC_TRUE;
 159     }
 160     else
 161     {
 162         libvlc_global_data_t *p_libvlc_global = vlc_global();
 163         if( i_type == VLC_OBJECT_LIBVLC )
 164         {
 165             p_new->p_libvlc = (libvlc_int_t*)p_new;
 166             p_priv->b_attached = VLC_TRUE;
 167         }
 168         else
 169         {
 170             p_new->p_libvlc = p_this->p_libvlc;
 171         }
 172
 173         vlc_mutex_lock( &structure_lock );
 174
 175         p_libvlc_global->i_counter++;
 176         p_new->i_object_id = p_libvlc_global->i_counter;
 177
 178         /* Wooohaa! If *this* fails, we're in serious trouble! Anyway it's
 179          * useless to try and recover anything if pp_objects gets smashed. */
 180         TAB_APPEND( p_libvlc_global->i_objects, p_libvlc_global->pp_objects,
 181                     p_new );
 182
 183         vlc_mutex_unlock( &structure_lock );
 184     }
 185
 186     p_priv->i_refcount = 0;
 187     p_new->p_parent = NULL;
 188     p_new->pp_children = NULL;
 189     p_new->i_children = 0;
 190
 191     p_new->p_private = NULL;
 192
 193     /* Initialize mutexes and condvars */
 194     vlc_mutex_init( p_new, &p_new->object_lock );
 195     vlc_cond_init( p_new, &p_new->object_wait );
 196     vlc_mutex_init( p_new, &p_priv->var_lock );
 197     p_priv->pipes[0] = p_priv->pipes[1] = -1;
 198
 199     if( i_type == VLC_OBJECT_GLOBAL )
 200     {
 201         vlc_mutex_init( p_new, &structure_lock );
 202     }
 203
 204     if( i_type == VLC_OBJECT_LIBVLC )
 205     {
 206         var_Create( p_new, "list", VLC_VAR_STRING | VLC_VAR_ISCOMMAND );
 207         var_AddCallback( p_new, "list", DumpCommand, NULL );
 208         var_Create( p_new, "tree", VLC_VAR_STRING | VLC_VAR_ISCOMMAND );
 209         var_AddCallback( p_new, "tree", DumpCommand, NULL );
 210         var_Create( p_new, "vars", VLC_VAR_STRING | VLC_VAR_ISCOMMAND );
 211         var_AddCallback( p_new, "vars", DumpCommand, NULL );
 212     }
 213
 214     return p_new;
 215 }
 216
 217
 218 /**
 219  * Allocates and initializes a vlc object.
 220  *
 221  * @param i_type known object type (all of them are negative integer values),
 222  *               or object byte size (always positive).
 223  *
 224  * @return the new object, or NULL on error.
 225  */
 226 void * __vlc_object_create( vlc_object_t *p_this, int i_type )
 227 {
 228     const char   * psz_type;
 229     size_t         i_size;
 230
 231     switch( i_type )
 232     {
 233         case VLC_OBJECT_GLOBAL:
 234             i_size = sizeof(libvlc_global_data_t);
 235             psz_type = "global";
 236             break;
 237         case VLC_OBJECT_LIBVLC:
 238             i_size = sizeof(libvlc_int_t);
 239             psz_type = "libvlc";
 240             break;
 241         case VLC_OBJECT_INTF:
 242             i_size = sizeof(intf_thread_t);
 243             psz_type = "interface";
 244             break;
 245         case VLC_OBJECT_DIALOGS:
 246             i_size = sizeof(intf_thread_t);
 247             psz_type = "dialogs";
 248             break;
 249         case VLC_OBJECT_PLAYLIST:
 250             i_size = sizeof(playlist_t);
 251             psz_type = "playlist";
 252             break;
 253         case VLC_OBJECT_SD:
 254             i_size = sizeof(services_discovery_t);
 255             psz_type = "services discovery";
 256             break;
 257         case VLC_OBJECT_INPUT:
 258             i_size = sizeof(input_thread_t);
 259             psz_type = "input";
 260             break;
 261         case VLC_OBJECT_DEMUX:
 262             i_size = sizeof(demux_t);
 263             psz_type = "demux";
 264             break;
 265         case VLC_OBJECT_ACCESS:
 266             i_size = sizeof(access_t);
 267             psz_type = "access";
 268             break;
 269         case VLC_OBJECT_DECODER:
 270             i_size = sizeof(decoder_t);
 271             psz_type = "decoder";
 272             break;
 273         case VLC_OBJECT_PACKETIZER:
 274             i_size = sizeof(decoder_t);
 275             psz_type = "packetizer";
 276             break;
 277         case VLC_OBJECT_ENCODER:
 278             i_size = sizeof(encoder_t);
 279             psz_type = "encoder";
 280             break;
 281         case VLC_OBJECT_FILTER:
 282             i_size = sizeof(filter_t);
 283             psz_type = "filter";
 284             break;
 285         case VLC_OBJECT_VOUT:
 286             i_size = sizeof(vout_thread_t);
 287             psz_type = "video output";
 288             break;
 289         case VLC_OBJECT_SPU:
 290             i_size = sizeof(spu_t);
 291             psz_type = "subpicture";
 292             break;
 293         case VLC_OBJECT_AOUT:
 294             i_size = sizeof(aout_instance_t);
 295             psz_type = "audio output";
 296             break;
 297         case VLC_OBJECT_SOUT:
 298             i_size = sizeof(sout_instance_t);
 299             psz_type = "stream output";
 300             break;
 301         case VLC_OBJECT_VLM:
 302             i_size = sizeof( vlm_t );
 303             psz_type = "vlm dameon";
 304             break;
 305         case VLC_OBJECT_VOD:
 306             i_size = sizeof( vod_t );
 307             psz_type = "vod server";
 308             break;
 309         case VLC_OBJECT_XML:
 310             i_size = sizeof( xml_t );
 311             psz_type = "xml";
 312             break;
 313         case VLC_OBJECT_OPENGL:
 314             i_size = sizeof( vout_thread_t );
 315             psz_type = "opengl";
 316             break;
 317         case VLC_OBJECT_ANNOUNCE:
 318             i_size = sizeof( announce_handler_t );
 319             psz_type = "announce";
 320             break;
 321         case VLC_OBJECT_META_ENGINE:
 322             i_size = sizeof( meta_engine_t );
 323             psz_type = "meta engine";
 324             break;
 325         case VLC_OBJECT_OSDMENU:
 326             i_size = sizeof( osd_menu_t );
 327             psz_type = "osd menu";
 328             break;
 329         default:
 330             i_size = i_type > (int)sizeof(vlc_object_t)
 331                          ? i_type : (int)sizeof(vlc_object_t);
 332             i_type = VLC_OBJECT_GENERIC;
 333             psz_type = "generic";
 334             break;
 335     }
 336
 337     return vlc_custom_create( p_this, i_size, i_type, psz_type );
 338 }
 339
 340
 341 /**
 342  ****************************************************************************
 343  * Destroy a vlc object
 344  *
 345  * This function destroys an object that has been previously allocated with
 346  * vlc_object_create. The object's refcount must be zero and it must not be
 347  * attached to other objects in any way.
 348  *****************************************************************************/
 349 void __vlc_object_destroy( vlc_object_t *p_this )
 350 {
 351     vlc_object_internals_t *p_priv = vlc_internals( p_this );
 352     int i_delay = 0;
 353
 354     if( p_this->i_children )
 355     {
 356         msg_Err( p_this, "cannot delete object (%i, %s) with children" ,
 357                  p_this->i_object_id, p_this->psz_object_name );
 358         return;
 359     }
 360
 361     if( p_this->p_parent )
 362     {
 363         msg_Err( p_this, "cannot delete object (%i, %s) with a parent",
 364                  p_this->i_object_id, p_this->psz_object_name );
 365         return;
 366     }
 367
 368     while( p_priv->i_refcount > 0 )
 369     {
 370         i_delay++;
 371
 372         /* Don't warn immediately ... 100ms seems OK */
 373         if( i_delay == 2 )
 374         {
 375             msg_Warn( p_this,
 376                   "refcount is %u, delaying before deletion (id=%d,type=%d)",
 377                   p_priv->i_refcount, p_this->i_object_id,
 378                   p_this->i_object_type );
 379         }
 380         else if( i_delay == 10 )
 381         {
 382             msg_Err( p_this,
 383                   "refcount is %u, delaying again (id=%d,type=%d)",
 384                   p_priv->i_refcount, p_this->i_object_id,
 385                   p_this->i_object_type );
 386         }
 387         else if( i_delay == 20 )
 388         {
 389             msg_Err( p_this,
 390                   "waited too long, cancelling destruction (id=%d,type=%d)",
 391                   p_this->i_object_id, p_this->i_object_type );
 392             return;
 393         }
 394
 395         msleep( 100000 );
 396     }
 397
 398     /* Destroy the associated variables, starting from the end so that
 399      * no memmove calls have to be done. */
 400     while( p_priv->i_vars )
 401     {
 402         var_Destroy( p_this, p_priv->p_vars[p_priv->i_vars - 1].psz_name );
 403     }
 404
 405     free( p_priv->p_vars );
 406     vlc_mutex_destroy( &p_priv->var_lock );
 407
 408     if( p_this->psz_header ) free( p_this->psz_header );
 409
 410     if( p_this->i_object_type == VLC_OBJECT_GLOBAL )
 411     {
 412         libvlc_global_data_t *p_global = (libvlc_global_data_t *)p_this;
 413         /* We are the global object ... no need to lock. */
 414         free( p_global->pp_objects );
 415         p_global->pp_objects = NULL;
 416         p_global->i_objects--;
 417
 418         vlc_mutex_destroy( &structure_lock );
 419     }
 420     else
 421     {
 422         libvlc_global_data_t *p_libvlc_global = vlc_global();
 423         int i_index;
 424
 425         vlc_mutex_lock( &structure_lock );
 426
 427         /* Wooohaa! If *this* fails, we're in serious trouble! Anyway it's
 428          * useless to try and recover anything if pp_objects gets smashed. */
 429         i_index = FindIndex( p_this, p_libvlc_global->pp_objects,
 430                              p_libvlc_global->i_objects );
 431         REMOVE_ELEM( p_libvlc_global->pp_objects,
 432                      p_libvlc_global->i_objects, i_index );
 433
 434         vlc_mutex_unlock( &structure_lock );
 435     }
 436
 437 #if defined(WIN32) || defined(UNDER_CE)
 438     /* if object has an associated thread, close it now */
 439     if( p_priv->thread_id.hThread )
 440        CloseHandle(p_priv->thread_id.hThread);
 441 #endif
 442
 443     vlc_mutex_destroy( &p_this->object_lock );
 444     vlc_cond_destroy( &p_this->object_wait );
 445     if( p_priv->pipes[0] != -1 )
 446         close( p_priv->pipes[0] );
 447     if( p_priv->pipes[1] != -1 )
 448         close( p_priv->pipes[1] );
 449
 450     /* global is not dynamically allocated by vlc_object_create */
 451     if( p_this->i_object_type != VLC_OBJECT_GLOBAL )
 452         free( p_priv );
 453 }
 454
 455
 456 /** Inter-object signaling */
 457
 458 void __vlc_object_lock( vlc_object_t *obj )
 459 {
 460     vlc_mutex_lock( &obj->object_lock );
 461 }
 462
 463 void __vlc_object_unlock( vlc_object_t *obj )
 464 {
 465     vlc_assert_locked( &obj->object_lock );
 466     vlc_mutex_unlock( &obj->object_lock );
 467 }
 468
 469 /**
 470  * Returns the readable end of a pipe that becomes readable whenever
 471  * an object is signaled. This can be used to wait for VLC object events
 472  * inside select(), poll() loops or frameworks providing an event loop.
 473  *
 474  * Note that the pipe will remain the same for the lifetime of the object.
 475  * DO NOT close it yourself. Ever.
 476  *
 477  * DO NOT try to read from the pipe either: call vlc_object_wait() instead.
 478  * Assuming the pipe is readable, vlc_object_wait() will not block.
 479  * Also note that, as with vlc_object_wait(), there may be spurious wakeups.
 480  *
 481  * @param obj object that would be signaled (object lock MUST hold)
 482  * @return a readable pipe descriptor, or -1 on error.
 483  */
 484 int vlc_object_waitpipe( vlc_object_t *obj )
 485 {
 486     int *pipes = obj->p_internals->pipes;
 487     vlc_assert_locked( &obj->object_lock );
 488
 489     if( pipes[1] == -1 )
 490     {
 491         /* This can only ever happen if someone killed us without locking */
 492         assert( pipes[0] == -1 );
 493
 494 #ifndef WIN32
 495         if( pipe( pipes ) )
 496 #endif
 497             return -1;
 498     }
 499
 500     return pipes[0];
 501 }
 502
 503
 504 /**
 505  * Waits for the object to be signaled (using vlc_object_signal()).
 506  * If the object already has a signal pending, this function will return
 507  * immediately. It is asserted that the caller holds the object lock.
 508  *
 509  * @return true if the object is dying and should terminate.
 510  */
 511 vlc_bool_t __vlc_object_wait( vlc_object_t *obj )
 512 {
 513     vlc_assert_locked( &obj->object_lock );
 514
 515     int fd = obj->p_internals->pipes[0];
 516     if( fd != -1 )
 517     {
 518         if( read( fd, &(char){ 0 }, 1 ) == 0 )
 519         {
 520             close( fd );
 521             obj->p_internals->pipes[1] = -1;
 522         }
 523         return obj->b_die;
 524     }
 525
 526     vlc_cond_wait( &obj->object_wait, &obj->object_lock );
 527     return obj->b_die;
 528 }
 529
 530
 531 /**
 532  * Waits for the object to be signaled (using vlc_object_signal()), or for
 533  * a timer to expire.
 534  * If the object already has a signal pending, this function will return
 535  * immediately. It is asserted that the caller holds the object lock.
 536  *
 537  * @return negative if the object is dying and should terminate,
 538  * positive if the the object has been signaled but is not dying,
 539  * 0 if timeout has been reached.
 540  */
 541 int __vlc_object_timedwait( vlc_object_t *obj, mtime_t deadline )
 542 {
 543     int v;
 544
 545     vlc_assert_locked( &obj->object_lock );
 546     v = vlc_cond_timedwait( &obj->object_wait, &obj->object_lock, deadline );
 547     if( v == 0 ) /* signaled */
 548         return obj->b_die ? -1 : 1;
 549     return 0;
 550 }
 551
 552
 553 /**
 554  * Checks whether an object has been "killed".
 555  * The object lock must be held.
 556  *
 557  * Typical code for an object thread could be:
 558  *
 559    vlc_object_lock (self);
 560    ...initialization...
 561    while (vlc_object_alive (self))
 562    {
 563        ...preprocessing...
 564
 565        if (vlc_object_wait (self))
 566            continue;
 567
 568        ...postprocessing...
 569    }
 570    ...deinitialization...
 571    vlc_object_unlock (self);
 572  *
 573  *
 574  * @return true iff the object has not been killed yet
 575  */
 576 vlc_bool_t __vlc_object_alive( vlc_object_t *obj )
 577 {
 578     vlc_assert_locked( &obj->object_lock );
 579     return !obj->b_die;
 580 }
 581
 582
 583 /**
 584  * Signals an object for which the lock is held.
 585  */
 586 void __vlc_object_signal_unlocked( vlc_object_t *obj )
 587 {
 588     vlc_assert_locked( &obj->object_lock );
 589
 590     int fd = obj->p_internals->pipes[1];
 591     if( fd != -1 )
 592         while( write( fd, &(char){ 0 }, 1 ) < 0 );
 593
 594     vlc_cond_signal( &obj->object_wait );
 595 }
 596
 597
 598 /**
 599  * Requests termination of an object.
 600  * If the object is LibVLC, also request to terminate all its children.
 601  */
 602 void __vlc_object_kill( vlc_object_t *p_this )
 603 {
 604     vlc_mutex_lock( &p_this->object_lock );
 605     p_this->b_die = VLC_TRUE;
 606
 607     if( p_this->i_object_type == VLC_OBJECT_LIBVLC )
 608         for( int i = 0; i < p_this->i_children ; i++ )
 609             vlc_object_kill( p_this->pp_children[i] );
 610
 611     int fd = p_this->p_internals->pipes[1];
 612     if( fd != -1 )
 613     {
 614         close( fd ); /* closing a pipe makes it readable too */
 615         p_this->p_internals->pipes[1] = -1;
 616     }
 617
 618     vlc_object_signal_unlocked( p_this );
 619     vlc_mutex_unlock( &p_this->object_lock );
 620 }
 621
 622
 623 /**
 624  * find an object given its ID
 625  *
 626  * This function looks for the object whose i_object_id field is i_id. We
 627  * use a dichotomy so that lookups are in log2(n).
 628  *****************************************************************************/
 629 void * __vlc_object_get( vlc_object_t *p_this, int i_id )
 630 {
 631     int i_max, i_middle;
 632     vlc_object_t **pp_objects;
 633     libvlc_global_data_t *p_libvlc_global = vlc_global();
 634
 635     vlc_mutex_lock( &structure_lock );
 636
 637     pp_objects = p_libvlc_global->pp_objects;
 638
 639     /* Perform our dichotomy */
 640     for( i_max = p_libvlc_global->i_objects - 1 ; ; )
 641     {
 642         i_middle = i_max / 2;
 643
 644         if( pp_objects[i_middle]->i_object_id > i_id )
 645         {
 646             i_max = i_middle;
 647         }
 648         else if( pp_objects[i_middle]->i_object_id < i_id )
 649         {
 650             if( i_middle )
 651             {
 652                 pp_objects += i_middle;
 653                 i_max -= i_middle;
 654             }
 655             else
 656             {
 657                 /* This happens when there are only two remaining objects */
 658                 if( pp_objects[i_middle+1]->i_object_id == i_id )
 659                 {
 660                     vlc_mutex_unlock( &structure_lock );
 661                     pp_objects[i_middle+1]->p_internals->i_refcount++;
 662                     return pp_objects[i_middle+1];
 663                 }
 664                 break;
 665             }
 666         }
 667         else
 668         {
 669             vlc_mutex_unlock( &structure_lock );
 670             pp_objects[i_middle]->p_internals->i_refcount++;
 671             return pp_objects[i_middle];
 672         }
 673
 674         if( i_max == 0 )
 675         {
 676             /* this means that i_max == i_middle, and since we have already
 677              * tested pp_objects[i_middle]), p_found is properly set. */
 678             break;
 679         }
 680     }
 681
 682     vlc_mutex_unlock( &structure_lock );
 683     return NULL;
 684 }
 685
 686 /**
 687  ****************************************************************************
 688  * find a typed object and increment its refcount
 689  *****************************************************************************
 690  * This function recursively looks for a given object type. i_mode can be one
 691  * of FIND_PARENT, FIND_CHILD or FIND_ANYWHERE.
 692  *****************************************************************************/
 693 void * __vlc_object_find( vlc_object_t *p_this, int i_type, int i_mode )
 694 {
 695     vlc_object_t *p_found;
 696
 697     vlc_mutex_lock( &structure_lock );
 698
 699     /* If we are of the requested type ourselves, don't look further */
 700     if( !(i_mode & FIND_STRICT) && p_this->i_object_type == i_type )
 701     {
 702         p_this->p_internals->i_refcount++;
 703         vlc_mutex_unlock( &structure_lock );
 704         return p_this;
 705     }
 706
 707     /* Otherwise, recursively look for the object */
 708     if( (i_mode & 0x000f) == FIND_ANYWHERE )
 709     {
 710         vlc_object_t *p_root = p_this;
 711
 712         /* Find the root */
 713         while( p_root->p_parent != NULL &&
 714                p_root != VLC_OBJECT( p_this->p_libvlc ) )
 715         {
 716             p_root = p_root->p_parent;
 717         }
 718
 719         p_found = FindObject( p_root, i_type, (i_mode & ~0x000f)|FIND_CHILD );
 720         if( p_found == NULL && p_root != VLC_OBJECT( p_this->p_libvlc ) )
 721         {
 722             p_found = FindObject( VLC_OBJECT( p_this->p_libvlc ),
 723                                   i_type, (i_mode & ~0x000f)|FIND_CHILD );
 724         }
 725     }
 726     else
 727     {
 728         p_found = FindObject( p_this, i_type, i_mode );
 729     }
 730
 731     vlc_mutex_unlock( &structure_lock );
 732
 733     return p_found;
 734 }
 735
 736 /**
 737  ****************************************************************************
 738  * find a named object and increment its refcount
 739  *****************************************************************************
 740  * This function recursively looks for a given object name. i_mode can be one
 741  * of FIND_PARENT, FIND_CHILD or FIND_ANYWHERE.
 742  *****************************************************************************/
 743 void * __vlc_object_find_name( vlc_object_t *p_this, const char *psz_name,
 744                                int i_mode )
 745 {
 746     vlc_object_t *p_found;
 747
 748     vlc_mutex_lock( &structure_lock );
 749
 750     /* If have the requested name ourselves, don't look further */
 751     if( !(i_mode & FIND_STRICT)
 752         && p_this->psz_object_name
 753         && !strcmp( p_this->psz_object_name, psz_name ) )
 754     {
 755         p_this->p_internals->i_refcount++;
 756         vlc_mutex_unlock( &structure_lock );
 757         return p_this;
 758     }
 759
 760     /* Otherwise, recursively look for the object */
 761     if( (i_mode & 0x000f) == FIND_ANYWHERE )
 762     {
 763         vlc_object_t *p_root = p_this;
 764
 765         /* Find the root */
 766         while( p_root->p_parent != NULL &&
 767                p_root != VLC_OBJECT( p_this->p_libvlc ) )
 768         {
 769             p_root = p_root->p_parent;
 770         }
 771
 772         p_found = FindObjectName( p_root, psz_name,
 773                                  (i_mode & ~0x000f)|FIND_CHILD );
 774         if( p_found == NULL && p_root != VLC_OBJECT( p_this->p_libvlc ) )
 775         {
 776             p_found = FindObjectName( VLC_OBJECT( p_this->p_libvlc ),
 777                                       psz_name, (i_mode & ~0x000f)|FIND_CHILD );
 778         }
 779     }
 780     else
 781     {
 782         p_found = FindObjectName( p_this, psz_name, i_mode );
 783     }
 784
 785     vlc_mutex_unlock( &structure_lock );
 786
 787     return p_found;
 788 }
 789
 790 /**
 791  ****************************************************************************
 792  * increment an object refcount
 793  *****************************************************************************/
 794 void __vlc_object_yield( vlc_object_t *p_this )
 795 {
 796     vlc_mutex_lock( &structure_lock );
 797     p_this->p_internals->i_refcount++;
 798     vlc_mutex_unlock( &structure_lock );
 799 }
 800
 801 static inline void Release( vlc_object_t *obj )
 802 {
 803     assert( obj->p_internals->i_refcount > 0 );
 804     obj->p_internals->i_refcount--;
 805 }
 806
 807 /*****************************************************************************
 808  * decrement an object refcount
 809  *****************************************************************************/
 810 void __vlc_object_release( vlc_object_t *p_this )
 811 {
 812     vlc_mutex_lock( &structure_lock );
 813     Release( p_this );
 814     vlc_mutex_unlock( &structure_lock );
 815 }
 816
 817 /**
 818  ****************************************************************************
 819  * attach object to a parent object
 820  *****************************************************************************
 821  * This function sets p_this as a child of p_parent, and p_parent as a parent
 822  * of p_this. This link can be undone using vlc_object_detach.
 823  *****************************************************************************/
 824 void __vlc_object_attach( vlc_object_t *p_this, vlc_object_t *p_parent )
 825 {
 826     if( !p_this ) return;
 827
 828     vlc_mutex_lock( &structure_lock );
 829
 830     /* Attach the parent to its child */
 831     p_this->p_parent = p_parent;
 832
 833     /* Attach the child to its parent */
 834     INSERT_ELEM( p_parent->pp_children, p_parent->i_children,
 835                  p_parent->i_children, p_this );
 836
 837     /* Climb up the tree to see whether we are connected with the root */
 838     if( p_parent->p_internals->b_attached )
 839     {
 840         SetAttachment( p_this, VLC_TRUE );
 841     }
 842
 843     vlc_mutex_unlock( &structure_lock );
 844 }
 845
 846 /**
 847  ****************************************************************************
 848  * detach object from its parent
 849  *****************************************************************************
 850  * This function removes all links between an object and its parent.
 851  *****************************************************************************/
 852 void __vlc_object_detach( vlc_object_t *p_this )
 853 {
 854     if( !p_this ) return;
 855
 856     vlc_mutex_lock( &structure_lock );
 857     if( !p_this->p_parent )
 858     {
 859         msg_Err( p_this, "object is not attached" );
 860         vlc_mutex_unlock( &structure_lock );
 861         return;
 862     }
 863
 864     /* Climb up the tree to see whether we are connected with the root */
 865     if( p_this->p_parent->p_internals->b_attached )
 866     {
 867         SetAttachment( p_this, VLC_FALSE );
 868     }
 869
 870     DetachObject( p_this );
 871     vlc_mutex_unlock( &structure_lock );
 872     p_this = NULL;
 873 }
 874
 875 /**
 876  ****************************************************************************
 877  * find a list typed objects and increment their refcount
 878  *****************************************************************************
 879  * This function recursively looks for a given object type. i_mode can be one
 880  * of FIND_PARENT, FIND_CHILD or FIND_ANYWHERE.
 881  *****************************************************************************/
 882 vlc_list_t * __vlc_list_find( vlc_object_t *p_this, int i_type, int i_mode )
 883 {
 884     vlc_list_t *p_list;
 885     vlc_object_t **pp_current, **pp_end;
 886     int i_count = 0, i_index = 0;
 887     libvlc_global_data_t *p_libvlc_global = vlc_global();
 888
 889     vlc_mutex_lock( &structure_lock );
 890
 891     /* Look for the objects */
 892     switch( i_mode & 0x000f )
 893     {
 894     case FIND_ANYWHERE:
 895         pp_current = p_libvlc_global->pp_objects;
 896         pp_end = pp_current + p_libvlc_global->i_objects;
 897
 898         for( ; pp_current < pp_end ; pp_current++ )
 899         {
 900             if( (*pp_current)->p_internals->b_attached
 901                  && (*pp_current)->i_object_type == i_type )
 902             {
 903                 i_count++;
 904             }
 905         }
 906
 907         p_list = NewList( i_count );
 908         pp_current = p_libvlc_global->pp_objects;
 909
 910         for( ; pp_current < pp_end ; pp_current++ )
 911         {
 912             if( (*pp_current)->p_internals->b_attached
 913                  && (*pp_current)->i_object_type == i_type )
 914             {
 915                 ListReplace( p_list, *pp_current, i_index );
 916                 if( i_index < i_count ) i_index++;
 917             }
 918         }
 919     break;
 920
 921     case FIND_CHILD:
 922         i_count = CountChildren( p_this, i_type );
 923         p_list = NewList( i_count );
 924
 925         /* Check allocation was successful */
 926         if( p_list->i_count != i_count )
 927         {
 928             msg_Err( p_this, "list allocation failed!" );
 929             p_list->i_count = 0;
 930             break;
 931         }
 932
 933         p_list->i_count = 0;
 934         ListChildren( p_list, p_this, i_type );
 935         break;
 936
 937     default:
 938         msg_Err( p_this, "unimplemented!" );
 939         p_list = NewList( 0 );
 940         break;
 941     }
 942
 943     vlc_mutex_unlock( &structure_lock );
 944
 945     return p_list;
 946 }
 947
 948 /*****************************************************************************
 949  * DumpCommand: print the current vlc structure
 950  *****************************************************************************
 951  * This function prints either an ASCII tree showing the connections between
 952  * vlc objects, and additional information such as their refcount, thread ID,
 953  * etc. (command "tree"), or the same data as a simple list (command "list").
 954  *****************************************************************************/
 955 static int DumpCommand( vlc_object_t *p_this, char const *psz_cmd,
 956                         vlc_value_t oldval, vlc_value_t newval, void *p_data )
 957 {
 958     libvlc_global_data_t *p_libvlc_global = vlc_global();
 959
 960     (void)oldval; (void)p_data;
 961     if( *psz_cmd == 'l' )
 962     {
 963         vlc_mutex_lock( &structure_lock );
 964
 965         vlc_object_t **pp_current, **pp_end;
 966
 967         pp_current = p_libvlc_global->pp_objects;
 968         pp_end = pp_current + p_libvlc_global->i_objects;
 969
 970         for( ; pp_current < pp_end ; pp_current++ )
 971         {
 972             if( (*pp_current)->p_internals->b_attached )
 973             {
 974                 PrintObject( *pp_current, "" );
 975             }
 976             else
 977             {
 978                 printf( " o %.8i %s (not attached)\n",
 979                         (*pp_current)->i_object_id,
 980                         (*pp_current)->psz_object_type );
 981             }
 982         }
 983
 984         vlc_mutex_unlock( &structure_lock );
 985     }
 986     else
 987     {
 988         vlc_object_t *p_object = NULL;
 989
 990         if( *newval.psz_string )
 991         {
 992             char *end;
 993             int i_id = strtol( newval.psz_string, &end, 0 );
 994             if( end != newval.psz_string )
 995                 p_object = vlc_object_get( p_this, i_id );
 996             else
 997             {
 998                 /* try using the object's name to find it */
 999                 vlc_object_t *p_libvlc = vlc_object_get( p_this, 1 );
1000                 if( p_libvlc )
1001                 {
1002                     /* Look in p_libvlc's children tree */
1003                     p_object = vlc_object_find_name( p_libvlc,
1004                                                      newval.psz_string,
1005                                                      FIND_CHILD );
1006                     vlc_object_release( p_libvlc );
1007                 }
1008                 if( !p_object )
1009                 {
1010                     /* If it's not in libvlc, look in libvlc_global (== p_this) */
1011                     p_object = vlc_object_find_name( p_this,
1012                                                      newval.psz_string,
1013                                                      FIND_CHILD );
1014                 }
1015             }
1016
1017             if( !p_object )
1018             {
1019                 return VLC_ENOOBJ;
1020             }
1021         }
1022
1023         vlc_mutex_lock( &structure_lock );
1024
1025         if( *psz_cmd == 't' )
1026         {
1027             char psz_foo[2 * MAX_DUMPSTRUCTURE_DEPTH + 1];
1028
1029             if( !p_object )
1030                 p_object = p_this->p_libvlc ? VLC_OBJECT(p_this->p_libvlc) : p_this;
1031
1032             psz_foo[0] = '|';
1033             DumpStructure( p_object, 0, psz_foo );
1034         }
1035         else if( *psz_cmd == 'v' )
1036         {
1037             int i;
1038
1039             if( !p_object )
1040                 p_object = p_this->p_libvlc ? VLC_OBJECT(p_this->p_libvlc) : p_this;
1041
1042             PrintObject( p_object, "" );
1043
1044             if( !p_object->p_internals->i_vars )
1045                 printf( " `-o No variables\n" );
1046             for( i = 0; i < p_object->p_internals->i_vars; i++ )
1047             {
1048                 variable_t *p_var = p_object->p_internals->p_vars + i;
1049
1050                 const char *psz_type = "unknown";
1051                 switch( p_var->i_type & VLC_VAR_TYPE )
1052                 {
1053 #define MYCASE( type, nice )                \
1054                     case VLC_VAR_ ## type:  \
1055                         psz_type = nice;    \
1056                         break;
1057                     MYCASE( VOID, "void" );
1058                     MYCASE( BOOL, "bool" );
1059                     MYCASE( INTEGER, "integer" );
1060                     MYCASE( HOTKEY, "hotkey" );
1061                     MYCASE( STRING, "string" );
1062                     MYCASE( MODULE, "module" );
1063                     MYCASE( FILE, "file" );
1064                     MYCASE( DIRECTORY, "directory" );
1065                     MYCASE( VARIABLE, "variable" );
1066                     MYCASE( FLOAT, "float" );
1067                     MYCASE( TIME, "time" );
1068                     MYCASE( ADDRESS, "address" );
1069                     MYCASE( MUTEX, "mutex" );
1070                     MYCASE( LIST, "list" );
1071 #undef MYCASE
1072                 }
1073                 printf( " %c-o \"%s\" (%s",
1074                         i + 1 == p_object->p_internals->i_vars ? '`' : '|',
1075                         p_var->psz_name, psz_type );
1076                 if( p_var->psz_text )
1077                     printf( ", %s", p_var->psz_text );
1078                 printf( ")" );
1079                 if( p_var->i_type & VLC_VAR_ISCOMMAND )
1080                     printf( ", command" );
1081                 if( p_var->i_entries )
1082                     printf( ", %d callbacks", p_var->i_entries );
1083                 switch( p_var->i_type & 0x00f0 )
1084                 {
1085                     case VLC_VAR_VOID:
1086                     case VLC_VAR_MUTEX:
1087                         break;
1088                     case VLC_VAR_BOOL:
1089                         printf( ": %s", p_var->val.b_bool ? "true" : "false" );
1090                         break;
1091                     case VLC_VAR_INTEGER:
1092                         printf( ": %d", p_var->val.i_int );
1093                         break;
1094                     case VLC_VAR_STRING:
1095                         printf( ": \"%s\"", p_var->val.psz_string );
1096                         break;
1097                     case VLC_VAR_FLOAT:
1098                         printf( ": %f", p_var->val.f_float );
1099                         break;
1100                     case VLC_VAR_TIME:
1101                         printf( ": " I64Fi, (int64_t)p_var->val.i_time );
1102                         break;
1103                     case VLC_VAR_ADDRESS:
1104                         printf( ": %p", p_var->val.p_address );
1105                         break;
1106                     case VLC_VAR_LIST:
1107                         printf( ": TODO" );
1108                         break;
1109                 }
1110                 printf( "\n" );
1111             }
1112         }
1113
1114         vlc_mutex_unlock( &structure_lock );
1115
1116         if( *newval.psz_string )
1117         {
1118             vlc_object_release( p_object );
1119         }
1120     }
1121
1122     return VLC_SUCCESS;
1123 }
1124
1125 /*****************************************************************************
1126  * vlc_list_release: free a list previously allocated by vlc_list_find
1127  *****************************************************************************
1128  * This function decreases the refcount of all objects in the list and
1129  * frees the list.
1130  *****************************************************************************/
1131 void vlc_list_release( vlc_list_t *p_list )
1132 {
1133     int i_index;
1134
1135     vlc_mutex_lock( &structure_lock );
1136     for( i_index = 0; i_index < p_list->i_count; i_index++ )
1137     {
1138         Release( p_list->p_values[i_index].p_object );
1139     }
1140     vlc_mutex_unlock( &structure_lock );
1141
1142     free( p_list->p_values );
1143     free( p_list );
1144 }
1145
1146 /* Following functions are local */
1147
1148 /*****************************************************************************
1149  * FindIndex: find the index of an object in an array of objects
1150  *****************************************************************************
1151  * This function assumes that p_this can be found in pp_objects. It will not
1152  * crash if p_this cannot be found, but will return a wrong value. It is your
1153  * duty to check the return value if you are not certain that the object could
1154  * be found for sure.
1155  *****************************************************************************/
1156 static int FindIndex( vlc_object_t *p_this,
1157                       vlc_object_t **pp_objects, int i_count )
1158 {
1159     int i_middle = i_count / 2;
1160
1161     if( i_count == 0 )
1162     {
1163         return 0;
1164     }
1165
1166     if( pp_objects[i_middle] == p_this )
1167     {
1168         return i_middle;
1169     }
1170
1171     if( i_count == 1 )
1172     {
1173         return 0;
1174     }
1175
1176     /* We take advantage of the sorted array */
1177     if( pp_objects[i_middle]->i_object_id < p_this->i_object_id )
1178     {
1179         return i_middle + FindIndex( p_this, pp_objects + i_middle,
1180                                              i_count - i_middle );
1181     }
1182     else
1183     {
1184         return FindIndex( p_this, pp_objects, i_middle );
1185     }
1186 }
1187
1188 static vlc_object_t * FindObject( vlc_object_t *p_this, int i_type, int i_mode )
1189 {
1190     int i;
1191     vlc_object_t *p_tmp;
1192
1193     switch( i_mode & 0x000f )
1194     {
1195     case FIND_PARENT:
1196         p_tmp = p_this->p_parent;
1197         if( p_tmp )
1198         {
1199             if( p_tmp->i_object_type == i_type )
1200             {
1201                 p_tmp->p_internals->i_refcount++;
1202                 return p_tmp;
1203             }
1204             else
1205             {
1206                 return FindObject( p_tmp, i_type, i_mode );
1207             }
1208         }
1209         break;
1210
1211     case FIND_CHILD:
1212         for( i = p_this->i_children; i--; )
1213         {
1214             p_tmp = p_this->pp_children[i];
1215             if( p_tmp->i_object_type == i_type )
1216             {
1217                 p_tmp->p_internals->i_refcount++;
1218                 return p_tmp;
1219             }
1220             else if( p_tmp->i_children )
1221             {
1222                 p_tmp = FindObject( p_tmp, i_type, i_mode );
1223                 if( p_tmp )
1224                 {
1225                     return p_tmp;
1226                 }
1227             }
1228         }
1229         break;
1230
1231     case FIND_ANYWHERE:
1232         /* Handled in vlc_object_find */
1233         break;
1234     }
1235
1236     return NULL;
1237 }
1238
1239 static vlc_object_t * FindObjectName( vlc_object_t *p_this,
1240                                       const char *psz_name,
1241                                       int i_mode )
1242 {
1243     int i;
1244     vlc_object_t *p_tmp;
1245
1246     switch( i_mode & 0x000f )
1247     {
1248     case FIND_PARENT:
1249         p_tmp = p_this->p_parent;
1250         if( p_tmp )
1251         {
1252             if( p_tmp->psz_object_name
1253                 && !strcmp( p_tmp->psz_object_name, psz_name ) )
1254             {
1255                 p_tmp->p_internals->i_refcount++;
1256                 return p_tmp;
1257             }
1258             else
1259             {
1260                 return FindObjectName( p_tmp, psz_name, i_mode );
1261             }
1262         }
1263         break;
1264
1265     case FIND_CHILD:
1266         for( i = p_this->i_children; i--; )
1267         {
1268             p_tmp = p_this->pp_children[i];
1269             if( p_tmp->psz_object_name
1270                 && !strcmp( p_tmp->psz_object_name, psz_name ) )
1271             {
1272                 p_tmp->p_internals->i_refcount++;
1273                 return p_tmp;
1274             }
1275             else if( p_tmp->i_children )
1276             {
1277                 p_tmp = FindObjectName( p_tmp, psz_name, i_mode );
1278                 if( p_tmp )
1279                 {
1280                     return p_tmp;
1281                 }
1282             }
1283         }
1284         break;
1285
1286     case FIND_ANYWHERE:
1287         /* Handled in vlc_object_find */
1288         break;
1289     }
1290
1291     return NULL;
1292 }
1293
1294 static void DetachObject( vlc_object_t *p_this )
1295 {
1296     vlc_object_t *p_parent = p_this->p_parent;
1297     int i_index, i;
1298
1299     /* Remove p_this's parent */
1300     p_this->p_parent = NULL;
1301
1302     /* Remove all of p_parent's children which are p_this */
1303     for( i_index = p_parent->i_children ; i_index-- ; )
1304     {
1305         if( p_parent->pp_children[i_index] == p_this )
1306         {
1307             p_parent->i_children--;
1308             for( i = i_index ; i < p_parent->i_children ; i++ )
1309             {
1310                 p_parent->pp_children[i] = p_parent->pp_children[i+1];
1311             }
1312         }
1313     }
1314
1315     if( p_parent->i_children )
1316     {
1317         p_parent->pp_children = (vlc_object_t **)realloc( p_parent->pp_children,
1318                                p_parent->i_children * sizeof(vlc_object_t *) );
1319     }
1320     else
1321     {
1322         free( p_parent->pp_children );
1323         p_parent->pp_children = NULL;
1324     }
1325 }
1326
1327 /*****************************************************************************
1328  * SetAttachment: recursively set the b_attached flag of a subtree.
1329  *****************************************************************************
1330  * This function is used by the attach and detach functions to propagate
1331  * the b_attached flag in a subtree.
1332  *****************************************************************************/
1333 static void SetAttachment( vlc_object_t *p_this, vlc_bool_t b_attached )
1334 {
1335     int i_index;
1336
1337     for( i_index = p_this->i_children ; i_index-- ; )
1338     {
1339         SetAttachment( p_this->pp_children[i_index], b_attached );
1340     }
1341
1342     p_this->p_internals->b_attached = b_attached;
1343 }
1344
1345 static void PrintObject( vlc_object_t *p_this, const char *psz_prefix )
1346 {
1347     char psz_children[20], psz_refcount[20], psz_thread[30], psz_name[50],
1348          psz_parent[20];
1349
1350     psz_name[0] = '\0';
1351     if( p_this->psz_object_name )
1352     {
1353         snprintf( psz_name, 49, " \"%s\"", p_this->psz_object_name );
1354         if( psz_name[48] )
1355             psz_name[48] = '\"';
1356     }
1357
1358     psz_children[0] = '\0';
1359     switch( p_this->i_children )
1360     {
1361         case 0:
1362             break;
1363         case 1:
1364             strcpy( psz_children, ", 1 child" );
1365             break;
1366         default:
1367             snprintf( psz_children, 19, ", %i children", p_this->i_children );
1368             break;
1369     }
1370
1371     psz_refcount[0] = '\0';
1372     if( p_this->p_internals->i_refcount > 0 )
1373         snprintf( psz_refcount, 19, ", refcount %u",
1374                   p_this->p_internals->i_refcount );
1375
1376     psz_thread[0] = '\0';
1377     if( p_this->p_internals->b_thread )
1378         snprintf( psz_thread, 29, " (thread %u)",
1379 #if defined(WIN32) || defined(UNDER_CE)
1380                   (unsigned)p_this->p_internals->thread_id.id );
1381 #else
1382                   (unsigned)p_this->p_internals->thread_id );
1383 #endif
1384
1385     psz_parent[0] = '\0';
1386     if( p_this->p_parent )
1387         snprintf( psz_parent, 19, ", parent %i", p_this->p_parent->i_object_id );
1388
1389     printf( " %so %.8i %s%s%s%s%s%s\n", psz_prefix,
1390             p_this->i_object_id, p_this->psz_object_type,
1391             psz_name, psz_thread, psz_refcount, psz_children,
1392             psz_parent );
1393 }
1394
1395 static void DumpStructure( vlc_object_t *p_this, int i_level, char *psz_foo )
1396 {
1397     int i;
1398     char i_back = psz_foo[i_level];
1399     psz_foo[i_level] = '\0';
1400
1401     PrintObject( p_this, psz_foo );
1402
1403     psz_foo[i_level] = i_back;
1404
1405     if( i_level / 2 >= MAX_DUMPSTRUCTURE_DEPTH )
1406     {
1407         msg_Warn( p_this, "structure tree is too deep" );
1408         return;
1409     }
1410
1411     for( i = 0 ; i < p_this->i_children ; i++ )
1412     {
1413         if( i_level )
1414         {
1415             psz_foo[i_level-1] = ' ';
1416
1417             if( psz_foo[i_level-2] == '`' )
1418             {
1419                 psz_foo[i_level-2] = ' ';
1420             }
1421         }
1422
1423         if( i == p_this->i_children - 1 )
1424         {
1425             psz_foo[i_level] = '`';
1426         }
1427         else
1428         {
1429             psz_foo[i_level] = '|';
1430         }
1431
1432         psz_foo[i_level+1] = '-';
1433         psz_foo[i_level+2] = '\0';
1434
1435         DumpStructure( p_this->pp_children[i], i_level + 2, psz_foo );
1436     }
1437 }
1438
1439 static vlc_list_t * NewList( int i_count )
1440 {
1441     vlc_list_t * p_list = (vlc_list_t *)malloc( sizeof( vlc_list_t ) );
1442     if( p_list == NULL )
1443     {
1444         return NULL;
1445     }
1446
1447     p_list->i_count = i_count;
1448
1449     if( i_count == 0 )
1450     {
1451         p_list->p_values = NULL;
1452         return p_list;
1453     }
1454
1455     p_list->p_values = malloc( i_count * sizeof( vlc_value_t ) );
1456     if( p_list->p_values == NULL )
1457     {
1458         p_list->i_count = 0;
1459         return p_list;
1460     }
1461
1462     return p_list;
1463 }
1464
1465 static void ListReplace( vlc_list_t *p_list, vlc_object_t *p_object,
1466                          int i_index )
1467 {
1468     if( p_list == NULL || i_index >= p_list->i_count )
1469     {
1470         return;
1471     }
1472
1473     p_object->p_internals->i_refcount++;
1474
1475     p_list->p_values[i_index].p_object = p_object;
1476
1477     return;
1478 }
1479
1480 /*static void ListAppend( vlc_list_t *p_list, vlc_object_t *p_object )
1481 {
1482     if( p_list == NULL )
1483     {
1484         return;
1485     }
1486
1487     p_list->p_values = realloc( p_list->p_values, (p_list->i_count + 1)
1488                                 * sizeof( vlc_value_t ) );
1489     if( p_list->p_values == NULL )
1490     {
1491         p_list->i_count = 0;
1492         return;
1493     }
1494
1495     p_object->p_internals->i_refcount++;
1496
1497     p_list->p_values[p_list->i_count].p_object = p_object;
1498     p_list->i_count++;
1499
1500     return;
1501 }*/
1502
1503 static int CountChildren( vlc_object_t *p_this, int i_type )
1504 {
1505     vlc_object_t *p_tmp;
1506     int i, i_count = 0;
1507
1508     for( i = 0; i < p_this->i_children; i++ )
1509     {
1510         p_tmp = p_this->pp_children[i];
1511
1512         if( p_tmp->i_object_type == i_type )
1513         {
1514             i_count++;
1515         }
1516
1517         if( p_tmp->i_children )
1518         {
1519             i_count += CountChildren( p_tmp, i_type );
1520         }
1521     }
1522
1523     return i_count;
1524 }
1525
1526 static void ListChildren( vlc_list_t *p_list, vlc_object_t *p_this, int i_type )
1527 {
1528     vlc_object_t *p_tmp;
1529     int i;
1530
1531     for( i = 0; i < p_this->i_children; i++ )
1532     {
1533         p_tmp = p_this->pp_children[i];
1534
1535         if( p_tmp->i_object_type == i_type )
1536         {
1537             ListReplace( p_list, p_tmp, p_list->i_count++ );
1538         }
1539
1540         if( p_tmp->i_children )
1541         {
1542             ListChildren( p_list, p_tmp, i_type );
1543         }
1544     }
1545 }