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

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