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 #ifdef HAVE_CONFIG_H
  34 # include "config.h"
  35 #endif
  36
  37 #include <vlc/vlc.h>
  38
  39 #include "../libvlc.h"
  40 #include <vlc_vout.h>
  41 #include <vlc_aout.h>
  42 #include "audio_output/aout_internal.h"
  43
  44 #include <vlc_access.h>
  45 #include <vlc_demux.h>
  46 #include <vlc_stream.h>
  47
  48 #include <vlc_sout.h>
  49 #include "stream_output/stream_output.h"
  50
  51 #include "vlc_playlist.h"
  52 #include "vlc_interface.h"
  53 #include "vlc_codec.h"
  54 #include "vlc_filter.h"
  55
  56 #include "vlc_httpd.h"
  57 #include "vlc_vlm.h"
  58 #include "input/vlm_internal.h"
  59 #include "vlc_vod.h"
  60 #include "vlc_tls.h"
  61 #include "vlc_xml.h"
  62 #include "vlc_osd.h"
  63 #include "vlc_meta.h"
  64
  65 #include "variables.h"
  66 #ifndef WIN32
  67 # include <unistd.h>
  68 #else
  69 # include <io.h>
  70 # include <fcntl.h>
  71 # include <errno.h> /* ENOSYS */
  72 #endif
  73 #include <assert.h>
  74
  75 /*****************************************************************************
  76  * Local prototypes
  77  *****************************************************************************/
  78 static int  DumpCommand( vlc_object_t *, char const *,
  79                          vlc_value_t, vlc_value_t, void * );
  80
  81 static vlc_object_t * FindObject    ( vlc_object_t *, int, int );
  82 static vlc_object_t * FindObjectName( vlc_object_t *, const char *, int );
  83 static void           DetachObject  ( vlc_object_t * );
  84 static void           PrintObject   ( vlc_object_t *, const char * );
  85 static void           DumpStructure ( vlc_object_t *, int, char * );
  86 static int            FindIndex     ( vlc_object_t *, vlc_object_t **, int );
  87 static void           SetAttachment ( vlc_object_t *, vlc_bool_t );
  88
  89 static vlc_list_t   * NewList       ( int );
  90 static void           ListReplace   ( vlc_list_t *, vlc_object_t *, int );
  91 /*static void           ListAppend    ( vlc_list_t *, vlc_object_t * );*/
  92 static int            CountChildren ( vlc_object_t *, int );
  93 static void           ListChildren  ( vlc_list_t *, vlc_object_t *, int );
  94
  95 static void vlc_object_destroy( vlc_object_t *p_this );
  96
  97 /*****************************************************************************
  98  * Local structure lock
  99  *****************************************************************************/
 100 static vlc_mutex_t    structure_lock;
 101 static vlc_object_internals_t global_internals;
 102
 103 vlc_object_t *vlc_custom_create( vlc_object_t *p_this, size_t i_size,
 104                                  int i_type, const char *psz_type )
 105 {
 106     vlc_object_t *p_new;
 107     vlc_object_internals_t *p_priv;
 108
 109     if( i_type == VLC_OBJECT_GLOBAL )
 110     {
 111         p_new = p_this;
 112         p_priv = &global_internals;
 113         memset( p_priv, 0, sizeof( *p_priv ) );
 114     }
 115     else
 116     {
 117         p_priv = calloc( 1, sizeof( *p_priv ) + i_size );
 118         if( p_priv == NULL )
 119             return NULL;
 120
 121         p_new = (vlc_object_t *)(p_priv + 1);
 122     }
 123
 124     p_new->p_internals = p_priv;
 125     p_new->i_object_type = i_type;
 126     p_new->psz_object_type = psz_type;
 127
 128     p_new->psz_object_name = NULL;
 129
 130     p_new->b_die = VLC_FALSE;
 131     p_new->b_error = VLC_FALSE;
 132     p_new->b_dead = VLC_FALSE;
 133     p_priv->b_attached = VLC_FALSE;
 134     p_new->b_force = VLC_FALSE;
 135
 136     p_new->psz_header = NULL;
 137
 138     if( p_this->i_flags & OBJECT_FLAGS_NODBG )
 139         p_new->i_flags |= OBJECT_FLAGS_NODBG;
 140     if( p_this->i_flags & OBJECT_FLAGS_QUIET )
 141         p_new->i_flags |= OBJECT_FLAGS_QUIET;
 142     if( p_this->i_flags & OBJECT_FLAGS_NOINTERACT )
 143         p_new->i_flags |= OBJECT_FLAGS_NOINTERACT;
 144
 145     p_priv->p_vars = calloc( sizeof( variable_t ), 16 );
 146
 147     if( !p_priv->p_vars )
 148     {
 149         if( i_type != VLC_OBJECT_GLOBAL )
 150             free( p_priv );
 151         return NULL;
 152     }
 153
 154     if( i_type == VLC_OBJECT_GLOBAL )
 155     {
 156         /* If i_type is global, then p_new is actually p_libvlc_global */
 157         libvlc_global_data_t *p_libvlc_global = (libvlc_global_data_t *)p_new;
 158         p_new->p_libvlc = NULL;
 159
 160         p_libvlc_global->i_counter = 0;
 161         p_new->i_object_id = 0;
 162
 163         p_libvlc_global->i_objects = 1;
 164         p_libvlc_global->pp_objects = malloc( sizeof(vlc_object_t *) );
 165         p_libvlc_global->pp_objects[0] = p_new;
 166         p_priv->b_attached = VLC_TRUE;
 167     }
 168     else
 169     {
 170         libvlc_global_data_t *p_libvlc_global = vlc_global();
 171         if( i_type == VLC_OBJECT_LIBVLC )
 172         {
 173             p_new->p_libvlc = (libvlc_int_t*)p_new;
 174             p_priv->b_attached = VLC_TRUE;
 175         }
 176         else
 177         {
 178             p_new->p_libvlc = p_this->p_libvlc;
 179         }
 180
 181         vlc_mutex_lock( &structure_lock );
 182
 183         p_libvlc_global->i_counter++;
 184         p_new->i_object_id = p_libvlc_global->i_counter;
 185
 186         /* Wooohaa! If *this* fails, we're in serious trouble! Anyway it's
 187          * useless to try and recover anything if pp_objects gets smashed. */
 188         TAB_APPEND( p_libvlc_global->i_objects, p_libvlc_global->pp_objects,
 189                     p_new );
 190
 191         vlc_mutex_unlock( &structure_lock );
 192     }
 193
 194     p_priv->i_refcount = 1;
 195     p_new->p_parent = NULL;
 196     p_new->pp_children = NULL;
 197     p_new->i_children = 0;
 198
 199     p_new->p_private = NULL;
 200
 201     /* Initialize mutexes and condvars */
 202     vlc_mutex_init( p_new, &p_new->object_lock );
 203     vlc_cond_init( p_new, &p_new->object_wait );
 204     vlc_mutex_init( p_new, &p_priv->var_lock );
 205     vlc_spin_init( &p_priv->spin );
 206     p_priv->pipes[0] = p_priv->pipes[1] = -1;
 207
 208     if( i_type == VLC_OBJECT_GLOBAL )
 209     {
 210         vlc_mutex_init( p_new, &structure_lock );
 211     }
 212
 213     if( i_type == VLC_OBJECT_LIBVLC )
 214     {
 215         var_Create( p_new, "list", VLC_VAR_STRING | VLC_VAR_ISCOMMAND );
 216         var_AddCallback( p_new, "list", DumpCommand, NULL );
 217         var_Create( p_new, "tree", VLC_VAR_STRING | VLC_VAR_ISCOMMAND );
 218         var_AddCallback( p_new, "tree", DumpCommand, NULL );
 219         var_Create( p_new, "vars", VLC_VAR_STRING | VLC_VAR_ISCOMMAND );
 220         var_AddCallback( p_new, "vars", DumpCommand, NULL );
 221     }
 222
 223     return p_new;
 224 }
 225
 226
 227 /**
 228  * Allocates and initializes a vlc object.
 229  *
 230  * @param i_type known object type (all of them are negative integer values),
 231  *               or object byte size (always positive).
 232  *
 233  * @return the new object, or NULL on error.
 234  */
 235 void * __vlc_object_create( vlc_object_t *p_this, int i_type )
 236 {
 237     const char   * psz_type;
 238     size_t         i_size;
 239
 240     switch( i_type )
 241     {
 242         case VLC_OBJECT_GLOBAL:
 243             i_size = sizeof(libvlc_global_data_t);
 244             psz_type = "global";
 245             break;
 246         case VLC_OBJECT_LIBVLC:
 247             i_size = sizeof(libvlc_int_t);
 248             psz_type = "libvlc";
 249             break;
 250         case VLC_OBJECT_INTF:
 251             i_size = sizeof(intf_thread_t);
 252             psz_type = "interface";
 253             break;
 254         case VLC_OBJECT_DIALOGS:
 255             i_size = sizeof(intf_thread_t);
 256             psz_type = "dialogs";
 257             break;
 258         case VLC_OBJECT_PLAYLIST:
 259             i_size = sizeof(playlist_t);
 260             psz_type = "playlist";
 261             break;
 262         case VLC_OBJECT_SD:
 263             i_size = sizeof(services_discovery_t);
 264             psz_type = "services discovery";
 265             break;
 266         case VLC_OBJECT_INPUT:
 267             i_size = sizeof(input_thread_t);
 268             psz_type = "input";
 269             break;
 270         case VLC_OBJECT_DEMUX:
 271             i_size = sizeof(demux_t);
 272             psz_type = "demux";
 273             break;
 274         case VLC_OBJECT_ACCESS:
 275             i_size = sizeof(access_t);
 276             psz_type = "access";
 277             break;
 278         case VLC_OBJECT_DECODER:
 279             i_size = sizeof(decoder_t);
 280             psz_type = "decoder";
 281             break;
 282         case VLC_OBJECT_PACKETIZER:
 283             i_size = sizeof(decoder_t);
 284             psz_type = "packetizer";
 285             break;
 286         case VLC_OBJECT_ENCODER:
 287             i_size = sizeof(encoder_t);
 288             psz_type = "encoder";
 289             break;
 290         case VLC_OBJECT_FILTER:
 291             i_size = sizeof(filter_t);
 292             psz_type = "filter";
 293             break;
 294         case VLC_OBJECT_VOUT:
 295             i_size = sizeof(vout_thread_t);
 296             psz_type = "video output";
 297             break;
 298         case VLC_OBJECT_SPU:
 299             i_size = sizeof(spu_t);
 300             psz_type = "subpicture";
 301             break;
 302         case VLC_OBJECT_AOUT:
 303             i_size = sizeof(aout_instance_t);
 304             psz_type = "audio output";
 305             break;
 306         case VLC_OBJECT_SOUT:
 307             i_size = sizeof(sout_instance_t);
 308             psz_type = "stream output";
 309             break;
 310         case VLC_OBJECT_VLM:
 311             i_size = sizeof( vlm_t );
 312             psz_type = "vlm dameon";
 313             break;
 314         case VLC_OBJECT_VOD:
 315             i_size = sizeof( vod_t );
 316             psz_type = "vod server";
 317             break;
 318         case VLC_OBJECT_XML:
 319             i_size = sizeof( xml_t );
 320             psz_type = "xml";
 321             break;
 322         case VLC_OBJECT_OPENGL:
 323             i_size = sizeof( vout_thread_t );
 324             psz_type = "opengl";
 325             break;
 326         case VLC_OBJECT_ANNOUNCE:
 327             i_size = sizeof( announce_handler_t );
 328             psz_type = "announce";
 329             break;
 330         case VLC_OBJECT_META_ENGINE:
 331             i_size = sizeof( meta_engine_t );
 332             psz_type = "meta engine";
 333             break;
 334         case VLC_OBJECT_OSDMENU:
 335             i_size = sizeof( osd_menu_t );
 336             psz_type = "osd menu";
 337             break;
 338         default:
 339             i_size = i_type > (int)sizeof(vlc_object_t)
 340                          ? i_type : (int)sizeof(vlc_object_t);
 341             i_type = VLC_OBJECT_GENERIC;
 342             psz_type = "generic";
 343             break;
 344     }
 345
 346     return vlc_custom_create( p_this, i_size, i_type, psz_type );
 347 }
 348
 349
 350 /**
 351  ****************************************************************************
 352  * Destroy a vlc object (Internal)
 353  *
 354  * This function destroys an object that has been previously allocated with
 355  * vlc_object_create. The object's refcount must be zero and it must not be
 356  * attached to other objects in any way.
 357  *****************************************************************************/
 358 static void vlc_object_destroy( vlc_object_t *p_this )
 359 {
 360     vlc_object_internals_t *p_priv = vlc_internals( p_this );
 361
 362     /* FIXME: ugly hack - we cannot use the message queue after
 363          * msg_Destroy(). */
 364     vlc_object_t *logger = p_this;
 365     if( p_this->p_libvlc == p_this )
 366         logger = NULL;
 367
 368     if( p_this->i_children )
 369     {
 370         fprintf( stderr,
 371                   "ERROR: cannot delete object (%i, %s) with children\n",
 372                   p_this->i_object_id, p_this->psz_object_name );
 373         fflush(stderr);
 374         abort();
 375     }
 376
 377     if( p_this->p_parent )
 378     {
 379         fprintf( stderr,
 380                   "ERROR: cannot delete object (%i, %s) with a parent\n",
 381                   p_this->i_object_id, p_this->psz_object_name );
 382         fflush(stderr);
 383         abort();
 384     }
 385
 386     /* Destroy the associated variables, starting from the end so that
 387      * no memmove calls have to be done. */
 388     while( p_priv->i_vars )
 389     {
 390         var_Destroy( p_this, p_priv->p_vars[p_priv->i_vars - 1].psz_name );
 391     }
 392
 393     free( p_priv->p_vars );
 394     vlc_mutex_destroy( &p_priv->var_lock );
 395
 396     if( p_this->psz_header ) free( p_this->psz_header );
 397
 398     if( p_this->i_object_type == VLC_OBJECT_GLOBAL )
 399     {
 400         libvlc_global_data_t *p_global = (libvlc_global_data_t *)p_this;
 401
 402         /* Remove ourselves */
 403         int i_index = FindIndex( p_this, p_global->pp_objects,
 404                              p_global->i_objects );
 405         REMOVE_ELEM( p_global->pp_objects,
 406                      p_global->i_objects, i_index );
 407
 408         /* Test for leaks */
 409         if( p_global->i_objects > 0 )
 410         {
 411             int i;
 412             for( i = 0; i < p_global->i_objects; i++ )
 413             {
 414                 /* We are leaking this object */
 415                 fprintf( stderr,
 416                       "ERROR: We are leaking object (id:%i, type:%s, name:%s)\n",
 417                       p_global->pp_objects[i]->i_object_id,
 418                       p_global->pp_objects[i]->psz_object_type,
 419                       p_global->pp_objects[i]->psz_object_name );
 420                 fflush(stderr);
 421             }
 422             /* Strongly abort, cause we want these to be fixed */
 423             abort();
 424         }
 425
 426         /* We are the global object ... no need to lock. */
 427         free( p_global->pp_objects );
 428         p_global->pp_objects = NULL;
 429
 430         vlc_mutex_destroy( &structure_lock );
 431     }
 432     else
 433     {
 434         libvlc_global_data_t *p_libvlc_global = vlc_global();
 435         int i_index;
 436
 437         vlc_mutex_lock( &structure_lock );
 438
 439         /* Wooohaa! If *this* fails, we're in serious trouble! Anyway it's
 440          * useless to try and recover anything if pp_objects gets smashed. */
 441         i_index = FindIndex( p_this, p_libvlc_global->pp_objects,
 442                              p_libvlc_global->i_objects );
 443         REMOVE_ELEM( p_libvlc_global->pp_objects,
 444                      p_libvlc_global->i_objects, i_index );
 445
 446         vlc_mutex_unlock( &structure_lock );
 447     }
 448
 449 #if defined(WIN32) || defined(UNDER_CE)
 450     /* if object has an associated thread, close it now */
 451     if( p_priv->thread_id.hThread )
 452        CloseHandle(p_priv->thread_id.hThread);
 453 #endif
 454
 455     vlc_mutex_destroy( &p_this->object_lock );
 456     vlc_cond_destroy( &p_this->object_wait );
 457     vlc_spin_destroy( &p_priv->spin );
 458     if( p_priv->pipes[1] != -1 )
 459         close( p_priv->pipes[1] );
 460     if( p_priv->pipes[0] != -1 )
 461         close( p_priv->pipes[0] );
 462
 463     /* global is not dynamically allocated by vlc_object_create */
 464     if( p_this->i_object_type != VLC_OBJECT_GLOBAL )
 465         free( p_priv );
 466 }
 467
 468
 469 /** Inter-object signaling */
 470
 471 void __vlc_object_lock( vlc_object_t *obj )
 472 {
 473     vlc_mutex_lock( &obj->object_lock );
 474 }
 475
 476 void __vlc_object_unlock( vlc_object_t *obj )
 477 {
 478     vlc_assert_locked( &obj->object_lock );
 479     vlc_mutex_unlock( &obj->object_lock );
 480 }
 481
 482 #ifdef WIN32
 483 # include <winsock2.h>
 484 # include <ws2tcpip.h>
 485
 486 /**
 487  * select()-able pipes emulated using Winsock
 488  */
 489 static int pipe (int fd[2])
 490 {
 491     SOCKADDR_IN addr;
 492     int addrlen = sizeof (addr);
 493
 494     SOCKET l = socket (PF_INET, SOCK_STREAM, IPPROTO_TCP), a,
 495            c = socket (PF_INET, SOCK_STREAM, IPPROTO_TCP);
 496     if ((l == INVALID_SOCKET) || (c == INVALID_SOCKET))
 497         goto error;
 498
 499     memset (&addr, 0, sizeof (addr));
 500     addr.sin_family = AF_INET;
 501     addr.sin_addr.s_addr = htonl (INADDR_LOOPBACK);
 502     if (bind (l, (PSOCKADDR)&addr, sizeof (addr))
 503      || getsockname (l, (PSOCKADDR)&addr, &addrlen)
 504      || listen (l, 1)
 505      || connect (c, (PSOCKADDR)&addr, addrlen))
 506         goto error;
 507
 508     a = accept (l, NULL, NULL);
 509     if (a == INVALID_SOCKET)
 510         goto error;
 511
 512     closesocket (l);
 513     //shutdown (a, 0);
 514     //shutdown (c, 1);
 515     fd[0] = c;
 516     fd[1] = a;
 517     return 0;
 518
 519 error:
 520     if (l != INVALID_SOCKET)
 521         closesocket (l);
 522     if (c != INVALID_SOCKET)
 523         closesocket (c);
 524     return -1;
 525 }
 526
 527 #undef  read
 528 #define read( a, b, c )  recv (a, b, c, 0)
 529 #undef  write
 530 #define write( a, b, c ) send (a, b, c, 0)
 531 #undef  close
 532 #define close( a )       closesocket (a)
 533 #endif /* WIN32 */
 534
 535 /**
 536  * Returns the readable end of a pipe that becomes readable once termination
 537  * of the object is requested (vlc_object_kill()).
 538  * This can be used to wake-up out of a select() or poll() event loop, such
 539  * typically when doing network I/O.
 540  *
 541  * Note that the pipe will remain the same for the lifetime of the object.
 542  * DO NOT read the pipe nor close it yourself. Ever.
 543  *
 544  * @param obj object that would be "killed"
 545  * @return a readable pipe descriptor, or -1 on error.
 546  */
 547 int __vlc_object_waitpipe( vlc_object_t *obj )
 548 {
 549     int pfd[2] = { -1, -1 };
 550     struct vlc_object_internals_t *internals = obj->p_internals;
 551     vlc_bool_t killed = VLC_FALSE;
 552
 553     vlc_spin_lock (&internals->spin);
 554     if (internals->pipes[0] == -1)
 555     {
 556         /* This can only ever happen if someone killed us without locking: */
 557         assert (internals->pipes[1] == -1);
 558         vlc_spin_unlock (&internals->spin);
 559
 560         if (pipe (pfd))
 561             return -1;
 562
 563         vlc_spin_lock (&internals->spin);
 564         if (internals->pipes[0] == -1)
 565         {
 566             internals->pipes[0] = pfd[0];
 567             internals->pipes[1] = pfd[1];
 568             pfd[0] = pfd[1] = -1;
 569         }
 570         killed = obj->b_die;
 571     }
 572     vlc_spin_unlock (&internals->spin);
 573
 574     if (killed)
 575     {
 576         /* Race condition: vlc_object_kill() already invoked! */
 577         int fd;
 578
 579         vlc_spin_lock (&internals->spin);
 580         fd = internals->pipes[1];
 581         internals->pipes[1] = -1;
 582         vlc_spin_unlock (&internals->spin);
 583
 584         msg_Dbg (obj, "waitpipe: object already dying");
 585         if (fd != -1)
 586             close (fd);
 587     }
 588
 589     /* Race condition: two threads call pipe() - unlikely */
 590     if (pfd[0] != -1)
 591         close (pfd[0]);
 592     if (pfd[1] != -1)
 593         close (pfd[1]);
 594
 595     return internals->pipes[0];
 596 }
 597
 598
 599 /**
 600  * Waits for the object to be signaled (using vlc_object_signal()).
 601  * If the object already has a signal pending, this function will return
 602  * immediately. It is asserted that the caller holds the object lock.
 603  *
 604  * @return true if the object is dying and should terminate.
 605  */
 606 vlc_bool_t __vlc_object_wait( vlc_object_t *obj )
 607 {
 608     vlc_assert_locked( &obj->object_lock );
 609     vlc_cond_wait( &obj->object_wait, &obj->object_lock );
 610     return obj->b_die;
 611 }
 612
 613
 614 /**
 615  * Waits for the object to be signaled (using vlc_object_signal()), or for
 616  * a timer to expire.
 617  * If the object already has a signal pending, this function will return
 618  * immediately. It is asserted that the caller holds the object lock.
 619  *
 620  * @return negative if the object is dying and should terminate,
 621  * positive if the the object has been signaled but is not dying,
 622  * 0 if timeout has been reached.
 623  */
 624 int __vlc_object_timedwait( vlc_object_t *obj, mtime_t deadline )
 625 {
 626     int v;
 627
 628     vlc_assert_locked( &obj->object_lock );
 629     v = vlc_cond_timedwait( &obj->object_wait, &obj->object_lock, deadline );
 630     if( v == 0 ) /* signaled */
 631         return obj->b_die ? -1 : 1;
 632     return 0;
 633 }
 634
 635
 636 /**
 637  * Checks whether an object has been "killed".
 638  * The object lock must be held.
 639  *
 640  * Typical code for an object thread could be:
 641  *
 642    vlc_object_lock (self);
 643    ...initialization...
 644    while (vlc_object_alive (self))
 645    {
 646        ...preprocessing...
 647
 648        if (vlc_object_wait (self))
 649            continue;
 650
 651        ...postprocessing...
 652    }
 653    ...deinitialization...
 654    vlc_object_unlock (self);
 655  *
 656  *
 657  * @return true iff the object has not been killed yet
 658  */
 659 vlc_bool_t __vlc_object_alive( vlc_object_t *obj )
 660 {
 661     vlc_assert_locked( &obj->object_lock );
 662     return !obj->b_die;
 663 }
 664
 665
 666 /**
 667  * Signals an object for which the lock is held.
 668  */
 669 void __vlc_object_signal_unlocked( vlc_object_t *obj )
 670 {
 671     vlc_assert_locked (&obj->object_lock);
 672     vlc_cond_signal( &obj->object_wait );
 673 }
 674
 675
 676 /**
 677  * Requests termination of an object.
 678  * If the object is LibVLC, also request to terminate all its children.
 679  */
 680 void __vlc_object_kill( vlc_object_t *p_this )
 681 {
 682     struct vlc_object_internals_t *internals = p_this->p_internals;
 683     int fd;
 684
 685     vlc_mutex_lock( &p_this->object_lock );
 686     p_this->b_die = VLC_TRUE;
 687
 688     vlc_spin_lock (&internals->spin);
 689     fd = internals->pipes[1];
 690     internals->pipes[1] = -1;
 691     vlc_spin_unlock (&internals->spin);
 692
 693     if( fd != -1 )
 694     {
 695         msg_Dbg (p_this, "waitpipe: object killed");
 696         close (fd);
 697     }
 698
 699     if( p_this->i_object_type == VLC_OBJECT_LIBVLC )
 700         for( int i = 0; i < p_this->i_children ; i++ )
 701             vlc_object_kill( p_this->pp_children[i] );
 702
 703     vlc_object_signal_unlocked( p_this );
 704     vlc_mutex_unlock( &p_this->object_lock );
 705 }
 706
 707
 708 /**
 709  * find an object given its ID
 710  *
 711  * This function looks for the object whose i_object_id field is i_id. We
 712  * use a dichotomy so that lookups are in log2(n).
 713  *****************************************************************************/
 714 void * vlc_object_get( int i_id )
 715 {
 716     int i_max, i_middle;
 717     vlc_object_t **pp_objects;
 718     libvlc_global_data_t *p_libvlc_global = vlc_global();
 719
 720     vlc_mutex_lock( &structure_lock );
 721
 722     pp_objects = p_libvlc_global->pp_objects;
 723
 724     /* Perform our dichotomy */
 725     for( i_max = p_libvlc_global->i_objects - 1 ; ; )
 726     {
 727         i_middle = i_max / 2;
 728
 729         if( pp_objects[i_middle]->i_object_id > i_id )
 730         {
 731             i_max = i_middle;
 732         }
 733         else if( pp_objects[i_middle]->i_object_id < i_id )
 734         {
 735             if( i_middle )
 736             {
 737                 pp_objects += i_middle;
 738                 i_max -= i_middle;
 739             }
 740             else
 741             {
 742                 /* This happens when there are only two remaining objects */
 743                 if( pp_objects[i_middle+1]->i_object_id == i_id )
 744                 {
 745                     vlc_mutex_unlock( &structure_lock );
 746                     pp_objects[i_middle+1]->p_internals->i_refcount++;
 747                     return pp_objects[i_middle+1];
 748                 }
 749                 break;
 750             }
 751         }
 752         else
 753         {
 754             vlc_mutex_unlock( &structure_lock );
 755             pp_objects[i_middle]->p_internals->i_refcount++;
 756             return pp_objects[i_middle];
 757         }
 758
 759         if( i_max == 0 )
 760         {
 761             /* this means that i_max == i_middle, and since we have already
 762              * tested pp_objects[i_middle]), p_found is properly set. */
 763             break;
 764         }
 765     }
 766
 767     vlc_mutex_unlock( &structure_lock );
 768     return NULL;
 769 }
 770
 771 /**
 772  ****************************************************************************
 773  * find a typed object and increment its refcount
 774  *****************************************************************************
 775  * This function recursively looks for a given object type. i_mode can be one
 776  * of FIND_PARENT, FIND_CHILD or FIND_ANYWHERE.
 777  *****************************************************************************/
 778 void * __vlc_object_find( vlc_object_t *p_this, int i_type, int i_mode )
 779 {
 780     vlc_object_t *p_found;
 781
 782     vlc_mutex_lock( &structure_lock );
 783
 784     /* If we are of the requested type ourselves, don't look further */
 785     if( !(i_mode & FIND_STRICT) && p_this->i_object_type == i_type )
 786     {
 787         p_this->p_internals->i_refcount++;
 788         vlc_mutex_unlock( &structure_lock );
 789         return p_this;
 790     }
 791
 792     /* Otherwise, recursively look for the object */
 793     if( (i_mode & 0x000f) == FIND_ANYWHERE )
 794     {
 795         vlc_object_t *p_root = p_this;
 796
 797         /* Find the root */
 798         while( p_root->p_parent != NULL &&
 799                p_root != VLC_OBJECT( p_this->p_libvlc ) )
 800         {
 801             p_root = p_root->p_parent;
 802         }
 803
 804         p_found = FindObject( p_root, i_type, (i_mode & ~0x000f)|FIND_CHILD );
 805         if( p_found == NULL && p_root != VLC_OBJECT( p_this->p_libvlc ) )
 806         {
 807             p_found = FindObject( VLC_OBJECT( p_this->p_libvlc ),
 808                                   i_type, (i_mode & ~0x000f)|FIND_CHILD );
 809         }
 810     }
 811     else
 812     {
 813         p_found = FindObject( p_this, i_type, i_mode );
 814     }
 815
 816     vlc_mutex_unlock( &structure_lock );
 817
 818     return p_found;
 819 }
 820
 821 /**
 822  ****************************************************************************
 823  * find a named object and increment its refcount
 824  *****************************************************************************
 825  * This function recursively looks for a given object name. i_mode can be one
 826  * of FIND_PARENT, FIND_CHILD or FIND_ANYWHERE.
 827  *****************************************************************************/
 828 void * __vlc_object_find_name( vlc_object_t *p_this, const char *psz_name,
 829                                int i_mode )
 830 {
 831     vlc_object_t *p_found;
 832
 833     vlc_mutex_lock( &structure_lock );
 834
 835     /* If have the requested name ourselves, don't look further */
 836     if( !(i_mode & FIND_STRICT)
 837         && p_this->psz_object_name
 838         && !strcmp( p_this->psz_object_name, psz_name ) )
 839     {
 840         p_this->p_internals->i_refcount++;
 841         vlc_mutex_unlock( &structure_lock );
 842         return p_this;
 843     }
 844
 845     /* Otherwise, recursively look for the object */
 846     if( (i_mode & 0x000f) == FIND_ANYWHERE )
 847     {
 848         vlc_object_t *p_root = p_this;
 849
 850         /* Find the root */
 851         while( p_root->p_parent != NULL &&
 852                p_root != VLC_OBJECT( p_this->p_libvlc ) )
 853         {
 854             p_root = p_root->p_parent;
 855         }
 856
 857         p_found = FindObjectName( p_root, psz_name,
 858                                  (i_mode & ~0x000f)|FIND_CHILD );
 859         if( p_found == NULL && p_root != VLC_OBJECT( p_this->p_libvlc ) )
 860         {
 861             p_found = FindObjectName( VLC_OBJECT( p_this->p_libvlc ),
 862                                       psz_name, (i_mode & ~0x000f)|FIND_CHILD );
 863         }
 864     }
 865     else
 866     {
 867         p_found = FindObjectName( p_this, psz_name, i_mode );
 868     }
 869
 870     vlc_mutex_unlock( &structure_lock );
 871
 872     return p_found;
 873 }
 874
 875 /**
 876  ****************************************************************************
 877  * increment an object refcount
 878  *****************************************************************************/
 879 void __vlc_object_yield( vlc_object_t *p_this )
 880 {
 881     vlc_mutex_lock( &structure_lock );
 882     p_this->p_internals->i_refcount++;
 883     vlc_mutex_unlock( &structure_lock );
 884 }
 885
 886 /*****************************************************************************
 887  * decrement an object refcount
 888  * And destroy the object if its refcount reach zero.
 889  *****************************************************************************/
 890 void __vlc_object_release( vlc_object_t *p_this )
 891 {
 892     vlc_bool_t b_should_destroy;
 893
 894     vlc_mutex_lock( &structure_lock );
 895
 896     assert( p_this->p_internals->i_refcount > 0 );
 897     p_this->p_internals->i_refcount--;
 898     b_should_destroy = (p_this->p_internals->i_refcount == 0);
 899
 900     vlc_mutex_unlock( &structure_lock );
 901
 902     if( b_should_destroy )
 903         vlc_object_destroy( p_this );
 904 }
 905
 906 /* Version without the lock */
 907 static void vlc_object_release_locked( vlc_object_t *p_this )
 908 {
 909     vlc_bool_t b_should_destroy;
 910
 911     assert( p_this->p_internals->i_refcount > 0 );
 912     p_this->p_internals->i_refcount--;
 913     b_should_destroy = (p_this->p_internals->i_refcount == 0);
 914
 915     if( b_should_destroy )
 916         vlc_object_destroy( p_this );
 917 }
 918
 919 /**
 920  ****************************************************************************
 921  * attach object to a parent object
 922  *****************************************************************************
 923  * This function sets p_this as a child of p_parent, and p_parent as a parent
 924  * of p_this. This link can be undone using vlc_object_detach.
 925  *****************************************************************************/
 926 void __vlc_object_attach( vlc_object_t *p_this, vlc_object_t *p_parent )
 927 {
 928     if( !p_this ) return;
 929
 930     vlc_mutex_lock( &structure_lock );
 931
 932     /* Attach the parent to its child */
 933     p_this->p_parent = p_parent;
 934
 935     /* Attach the child to its parent */
 936     INSERT_ELEM( p_parent->pp_children, p_parent->i_children,
 937                  p_parent->i_children, p_this );
 938
 939     /* Climb up the tree to see whether we are connected with the root */
 940     if( p_parent->p_internals->b_attached )
 941     {
 942         SetAttachment( p_this, VLC_TRUE );
 943     }
 944
 945     vlc_mutex_unlock( &structure_lock );
 946 }
 947
 948 /**
 949  ****************************************************************************
 950  * detach object from its parent
 951  *****************************************************************************
 952  * This function removes all links between an object and its parent.
 953  *****************************************************************************/
 954 void __vlc_object_detach( vlc_object_t *p_this )
 955 {
 956     if( !p_this ) return;
 957
 958     vlc_mutex_lock( &structure_lock );
 959     if( !p_this->p_parent )
 960     {
 961         msg_Err( p_this, "object is not attached" );
 962         vlc_mutex_unlock( &structure_lock );
 963         return;
 964     }
 965
 966     /* Climb up the tree to see whether we are connected with the root */
 967     if( p_this->p_parent->p_internals->b_attached )
 968     {
 969         SetAttachment( p_this, VLC_FALSE );
 970     }
 971
 972     DetachObject( p_this );
 973     vlc_mutex_unlock( &structure_lock );
 974     p_this = NULL;
 975 }
 976
 977 /**
 978  ****************************************************************************
 979  * find a list typed objects and increment their refcount
 980  *****************************************************************************
 981  * This function recursively looks for a given object type. i_mode can be one
 982  * of FIND_PARENT, FIND_CHILD or FIND_ANYWHERE.
 983  *****************************************************************************/
 984 vlc_list_t * __vlc_list_find( vlc_object_t *p_this, int i_type, int i_mode )
 985 {
 986     vlc_list_t *p_list;
 987     vlc_object_t **pp_current, **pp_end;
 988     int i_count = 0, i_index = 0;
 989     libvlc_global_data_t *p_libvlc_global = vlc_global();
 990
 991     vlc_mutex_lock( &structure_lock );
 992
 993     /* Look for the objects */
 994     switch( i_mode & 0x000f )
 995     {
 996     case FIND_ANYWHERE:
 997         pp_current = p_libvlc_global->pp_objects;
 998         pp_end = pp_current + p_libvlc_global->i_objects;
 999
1000         for( ; pp_current < pp_end ; pp_current++ )
1001         {
1002             if( (*pp_current)->p_internals->b_attached
1003                  && (*pp_current)->i_object_type == i_type )
1004             {
1005                 i_count++;
1006             }
1007         }
1008
1009         p_list = NewList( i_count );
1010         pp_current = p_libvlc_global->pp_objects;
1011
1012         for( ; pp_current < pp_end ; pp_current++ )
1013         {
1014             if( (*pp_current)->p_internals->b_attached
1015                  && (*pp_current)->i_object_type == i_type )
1016             {
1017                 ListReplace( p_list, *pp_current, i_index );
1018                 if( i_index < i_count ) i_index++;
1019             }
1020         }
1021     break;
1022
1023     case FIND_CHILD:
1024         i_count = CountChildren( p_this, i_type );
1025         p_list = NewList( i_count );
1026
1027         /* Check allocation was successful */
1028         if( p_list->i_count != i_count )
1029         {
1030             msg_Err( p_this, "list allocation failed!" );
1031             p_list->i_count = 0;
1032             break;
1033         }
1034
1035         p_list->i_count = 0;
1036         ListChildren( p_list, p_this, i_type );
1037         break;
1038
1039     default:
1040         msg_Err( p_this, "unimplemented!" );
1041         p_list = NewList( 0 );
1042         break;
1043     }
1044
1045     vlc_mutex_unlock( &structure_lock );
1046
1047     return p_list;
1048 }
1049
1050 /*****************************************************************************
1051  * DumpCommand: print the current vlc structure
1052  *****************************************************************************
1053  * This function prints either an ASCII tree showing the connections between
1054  * vlc objects, and additional information such as their refcount, thread ID,
1055  * etc. (command "tree"), or the same data as a simple list (command "list").
1056  *****************************************************************************/
1057 static int DumpCommand( vlc_object_t *p_this, char const *psz_cmd,
1058                         vlc_value_t oldval, vlc_value_t newval, void *p_data )
1059 {
1060     libvlc_global_data_t *p_libvlc_global = vlc_global();
1061
1062     (void)oldval; (void)p_data;
1063     if( *psz_cmd == 'l' )
1064     {
1065         vlc_mutex_lock( &structure_lock );
1066
1067         vlc_object_t **pp_current, **pp_end;
1068
1069         pp_current = p_libvlc_global->pp_objects;
1070         pp_end = pp_current + p_libvlc_global->i_objects;
1071
1072         for( ; pp_current < pp_end ; pp_current++ )
1073         {
1074             if( (*pp_current)->p_internals->b_attached )
1075             {
1076                 PrintObject( *pp_current, "" );
1077             }
1078             else
1079             {
1080                 printf( " o %.8i %s (not attached)\n",
1081                         (*pp_current)->i_object_id,
1082                         (*pp_current)->psz_object_type );
1083             }
1084         }
1085
1086         vlc_mutex_unlock( &structure_lock );
1087     }
1088     else
1089     {
1090         vlc_object_t *p_object = NULL;
1091
1092         if( *newval.psz_string )
1093         {
1094             char *end;
1095             int i_id = strtol( newval.psz_string, &end, 0 );
1096             if( end != newval.psz_string )
1097                 p_object = vlc_object_get( i_id );
1098             else
1099             {
1100                 /* try using the object's name to find it */
1101                 vlc_object_t *p_libvlc = vlc_object_get( 1 );
1102                 if( p_libvlc )
1103                 {
1104                     /* Look in p_libvlc's children tree */
1105                     p_object = vlc_object_find_name( p_libvlc,
1106                                                      newval.psz_string,
1107                                                      FIND_CHILD );
1108                     vlc_object_release( p_libvlc );
1109                 }
1110                 if( !p_object )
1111                 {
1112                     /* If it's not in libvlc, look in libvlc_global (== p_this) */
1113                     p_object = vlc_object_find_name( p_this,
1114                                                      newval.psz_string,
1115                                                      FIND_CHILD );
1116                 }
1117             }
1118
1119             if( !p_object )
1120             {
1121                 return VLC_ENOOBJ;
1122             }
1123         }
1124
1125         vlc_mutex_lock( &structure_lock );
1126
1127         if( *psz_cmd == 't' )
1128         {
1129             char psz_foo[2 * MAX_DUMPSTRUCTURE_DEPTH + 1];
1130
1131             if( !p_object )
1132                 p_object = p_this->p_libvlc ? VLC_OBJECT(p_this->p_libvlc) : p_this;
1133
1134             psz_foo[0] = '|';
1135             DumpStructure( p_object, 0, psz_foo );
1136         }
1137         else if( *psz_cmd == 'v' )
1138         {
1139             int i;
1140
1141             if( !p_object )
1142                 p_object = p_this->p_libvlc ? VLC_OBJECT(p_this->p_libvlc) : p_this;
1143
1144             PrintObject( p_object, "" );
1145
1146             if( !p_object->p_internals->i_vars )
1147                 printf( " `-o No variables\n" );
1148             for( i = 0; i < p_object->p_internals->i_vars; i++ )
1149             {
1150                 variable_t *p_var = p_object->p_internals->p_vars + i;
1151
1152                 const char *psz_type = "unknown";
1153                 switch( p_var->i_type & VLC_VAR_TYPE )
1154                 {
1155 #define MYCASE( type, nice )                \
1156                     case VLC_VAR_ ## type:  \
1157                         psz_type = nice;    \
1158                         break;
1159                     MYCASE( VOID, "void" );
1160                     MYCASE( BOOL, "bool" );
1161                     MYCASE( INTEGER, "integer" );
1162                     MYCASE( HOTKEY, "hotkey" );
1163                     MYCASE( STRING, "string" );
1164                     MYCASE( MODULE, "module" );
1165                     MYCASE( FILE, "file" );
1166                     MYCASE( DIRECTORY, "directory" );
1167                     MYCASE( VARIABLE, "variable" );
1168                     MYCASE( FLOAT, "float" );
1169                     MYCASE( TIME, "time" );
1170                     MYCASE( ADDRESS, "address" );
1171                     MYCASE( MUTEX, "mutex" );
1172                     MYCASE( LIST, "list" );
1173 #undef MYCASE
1174                 }
1175                 printf( " %c-o \"%s\" (%s",
1176                         i + 1 == p_object->p_internals->i_vars ? '`' : '|',
1177                         p_var->psz_name, psz_type );
1178                 if( p_var->psz_text )
1179                     printf( ", %s", p_var->psz_text );
1180                 printf( ")" );
1181                 if( p_var->i_type & VLC_VAR_ISCOMMAND )
1182                     printf( ", command" );
1183                 if( p_var->i_entries )
1184                     printf( ", %d callbacks", p_var->i_entries );
1185                 switch( p_var->i_type & 0x00f0 )
1186                 {
1187                     case VLC_VAR_VOID:
1188                     case VLC_VAR_MUTEX:
1189                         break;
1190                     case VLC_VAR_BOOL:
1191                         printf( ": %s", p_var->val.b_bool ? "true" : "false" );
1192                         break;
1193                     case VLC_VAR_INTEGER:
1194                         printf( ": %d", p_var->val.i_int );
1195                         break;
1196                     case VLC_VAR_STRING:
1197                         printf( ": \"%s\"", p_var->val.psz_string );
1198                         break;
1199                     case VLC_VAR_FLOAT:
1200                         printf( ": %f", p_var->val.f_float );
1201                         break;
1202                     case VLC_VAR_TIME:
1203                         printf( ": " I64Fi, (int64_t)p_var->val.i_time );
1204                         break;
1205                     case VLC_VAR_ADDRESS:
1206                         printf( ": %p", p_var->val.p_address );
1207                         break;
1208                     case VLC_VAR_LIST:
1209                         printf( ": TODO" );
1210                         break;
1211                 }
1212                 printf( "\n" );
1213             }
1214         }
1215
1216         vlc_mutex_unlock( &structure_lock );
1217
1218         if( *newval.psz_string )
1219         {
1220             vlc_object_release( p_object );
1221         }
1222     }
1223
1224     return VLC_SUCCESS;
1225 }
1226
1227 /*****************************************************************************
1228  * vlc_list_release: free a list previously allocated by vlc_list_find
1229  *****************************************************************************
1230  * This function decreases the refcount of all objects in the list and
1231  * frees the list.
1232  *****************************************************************************/
1233 void vlc_list_release( vlc_list_t *p_list )
1234 {
1235     int i_index;
1236
1237     vlc_mutex_lock( &structure_lock );
1238     for( i_index = 0; i_index < p_list->i_count; i_index++ )
1239     {
1240         vlc_object_release_locked( p_list->p_values[i_index].p_object );
1241     }
1242     vlc_mutex_unlock( &structure_lock );
1243
1244     free( p_list->p_values );
1245     free( p_list );
1246 }
1247
1248 /* Following functions are local */
1249
1250 /*****************************************************************************
1251  * FindIndex: find the index of an object in an array of objects
1252  *****************************************************************************
1253  * This function assumes that p_this can be found in pp_objects. It will not
1254  * crash if p_this cannot be found, but will return a wrong value. It is your
1255  * duty to check the return value if you are not certain that the object could
1256  * be found for sure.
1257  *****************************************************************************/
1258 static int FindIndex( vlc_object_t *p_this,
1259                       vlc_object_t **pp_objects, int i_count )
1260 {
1261     int i_middle = i_count / 2;
1262
1263     if( i_count == 0 )
1264     {
1265         return 0;
1266     }
1267
1268     if( pp_objects[i_middle] == p_this )
1269     {
1270         return i_middle;
1271     }
1272
1273     if( i_count == 1 )
1274     {
1275         return 0;
1276     }
1277
1278     /* We take advantage of the sorted array */
1279     if( pp_objects[i_middle]->i_object_id < p_this->i_object_id )
1280     {
1281         return i_middle + FindIndex( p_this, pp_objects + i_middle,
1282                                              i_count - i_middle );
1283     }
1284     else
1285     {
1286         return FindIndex( p_this, pp_objects, i_middle );
1287     }
1288 }
1289
1290 static vlc_object_t * FindObject( vlc_object_t *p_this, int i_type, int i_mode )
1291 {
1292     int i;
1293     vlc_object_t *p_tmp;
1294
1295     switch( i_mode & 0x000f )
1296     {
1297     case FIND_PARENT:
1298         p_tmp = p_this->p_parent;
1299         if( p_tmp )
1300         {
1301             if( p_tmp->i_object_type == i_type )
1302             {
1303                 p_tmp->p_internals->i_refcount++;
1304                 return p_tmp;
1305             }
1306             else
1307             {
1308                 return FindObject( p_tmp, i_type, i_mode );
1309             }
1310         }
1311         break;
1312
1313     case FIND_CHILD:
1314         for( i = p_this->i_children; i--; )
1315         {
1316             p_tmp = p_this->pp_children[i];
1317             if( p_tmp->i_object_type == i_type )
1318             {
1319                 p_tmp->p_internals->i_refcount++;
1320                 return p_tmp;
1321             }
1322             else if( p_tmp->i_children )
1323             {
1324                 p_tmp = FindObject( p_tmp, i_type, i_mode );
1325                 if( p_tmp )
1326                 {
1327                     return p_tmp;
1328                 }
1329             }
1330         }
1331         break;
1332
1333     case FIND_ANYWHERE:
1334         /* Handled in vlc_object_find */
1335         break;
1336     }
1337
1338     return NULL;
1339 }
1340
1341 static vlc_object_t * FindObjectName( vlc_object_t *p_this,
1342                                       const char *psz_name,
1343                                       int i_mode )
1344 {
1345     int i;
1346     vlc_object_t *p_tmp;
1347
1348     switch( i_mode & 0x000f )
1349     {
1350     case FIND_PARENT:
1351         p_tmp = p_this->p_parent;
1352         if( p_tmp )
1353         {
1354             if( p_tmp->psz_object_name
1355                 && !strcmp( p_tmp->psz_object_name, psz_name ) )
1356             {
1357                 p_tmp->p_internals->i_refcount++;
1358                 return p_tmp;
1359             }
1360             else
1361             {
1362                 return FindObjectName( p_tmp, psz_name, i_mode );
1363             }
1364         }
1365         break;
1366
1367     case FIND_CHILD:
1368         for( i = p_this->i_children; i--; )
1369         {
1370             p_tmp = p_this->pp_children[i];
1371             if( p_tmp->psz_object_name
1372                 && !strcmp( p_tmp->psz_object_name, psz_name ) )
1373             {
1374                 p_tmp->p_internals->i_refcount++;
1375                 return p_tmp;
1376             }
1377             else if( p_tmp->i_children )
1378             {
1379                 p_tmp = FindObjectName( p_tmp, psz_name, i_mode );
1380                 if( p_tmp )
1381                 {
1382                     return p_tmp;
1383                 }
1384             }
1385         }
1386         break;
1387
1388     case FIND_ANYWHERE:
1389         /* Handled in vlc_object_find */
1390         break;
1391     }
1392
1393     return NULL;
1394 }
1395
1396 static void DetachObject( vlc_object_t *p_this )
1397 {
1398     vlc_object_t *p_parent = p_this->p_parent;
1399     int i_index, i;
1400
1401     /* Remove p_this's parent */
1402     p_this->p_parent = NULL;
1403
1404     /* Remove all of p_parent's children which are p_this */
1405     for( i_index = p_parent->i_children ; i_index-- ; )
1406     {
1407         if( p_parent->pp_children[i_index] == p_this )
1408         {
1409             p_parent->i_children--;
1410             for( i = i_index ; i < p_parent->i_children ; i++ )
1411             {
1412                 p_parent->pp_children[i] = p_parent->pp_children[i+1];
1413             }
1414         }
1415     }
1416
1417     if( p_parent->i_children )
1418     {
1419         p_parent->pp_children = (vlc_object_t **)realloc( p_parent->pp_children,
1420                                p_parent->i_children * sizeof(vlc_object_t *) );
1421     }
1422     else
1423     {
1424         free( p_parent->pp_children );
1425         p_parent->pp_children = NULL;
1426     }
1427 }
1428
1429 /*****************************************************************************
1430  * SetAttachment: recursively set the b_attached flag of a subtree.
1431  *****************************************************************************
1432  * This function is used by the attach and detach functions to propagate
1433  * the b_attached flag in a subtree.
1434  *****************************************************************************/
1435 static void SetAttachment( vlc_object_t *p_this, vlc_bool_t b_attached )
1436 {
1437     int i_index;
1438
1439     for( i_index = p_this->i_children ; i_index-- ; )
1440     {
1441         SetAttachment( p_this->pp_children[i_index], b_attached );
1442     }
1443
1444     p_this->p_internals->b_attached = b_attached;
1445 }
1446
1447 static void PrintObject( vlc_object_t *p_this, const char *psz_prefix )
1448 {
1449     char psz_children[20], psz_refcount[20], psz_thread[30], psz_name[50],
1450          psz_parent[20];
1451
1452     psz_name[0] = '\0';
1453     if( p_this->psz_object_name )
1454     {
1455         snprintf( psz_name, 49, " \"%s\"", p_this->psz_object_name );
1456         if( psz_name[48] )
1457             psz_name[48] = '\"';
1458     }
1459
1460     psz_children[0] = '\0';
1461     switch( p_this->i_children )
1462     {
1463         case 0:
1464             break;
1465         case 1:
1466             strcpy( psz_children, ", 1 child" );
1467             break;
1468         default:
1469             snprintf( psz_children, 19, ", %i children", p_this->i_children );
1470             break;
1471     }
1472
1473     psz_refcount[0] = '\0';
1474     if( p_this->p_internals->i_refcount > 0 )
1475         snprintf( psz_refcount, 19, ", refcount %u",
1476                   p_this->p_internals->i_refcount );
1477
1478     psz_thread[0] = '\0';
1479     if( p_this->p_internals->b_thread )
1480         snprintf( psz_thread, 29, " (thread %u)",
1481 #if defined(WIN32) || defined(UNDER_CE)
1482                   (unsigned)p_this->p_internals->thread_id.id );
1483 #else
1484                   (unsigned)p_this->p_internals->thread_id );
1485 #endif
1486
1487     psz_parent[0] = '\0';
1488     if( p_this->p_parent )
1489         snprintf( psz_parent, 19, ", parent %i", p_this->p_parent->i_object_id );
1490
1491     printf( " %so %.8i %s%s%s%s%s%s\n", psz_prefix,
1492             p_this->i_object_id, p_this->psz_object_type,
1493             psz_name, psz_thread, psz_refcount, psz_children,
1494             psz_parent );
1495 }
1496
1497 static void DumpStructure( vlc_object_t *p_this, int i_level, char *psz_foo )
1498 {
1499     int i;
1500     char i_back = psz_foo[i_level];
1501     psz_foo[i_level] = '\0';
1502
1503     PrintObject( p_this, psz_foo );
1504
1505     psz_foo[i_level] = i_back;
1506
1507     if( i_level / 2 >= MAX_DUMPSTRUCTURE_DEPTH )
1508     {
1509         msg_Warn( p_this, "structure tree is too deep" );
1510         return;
1511     }
1512
1513     for( i = 0 ; i < p_this->i_children ; i++ )
1514     {
1515         if( i_level )
1516         {
1517             psz_foo[i_level-1] = ' ';
1518
1519             if( psz_foo[i_level-2] == '`' )
1520             {
1521                 psz_foo[i_level-2] = ' ';
1522             }
1523         }
1524
1525         if( i == p_this->i_children - 1 )
1526         {
1527             psz_foo[i_level] = '`';
1528         }
1529         else
1530         {
1531             psz_foo[i_level] = '|';
1532         }
1533
1534         psz_foo[i_level+1] = '-';
1535         psz_foo[i_level+2] = '\0';
1536
1537         DumpStructure( p_this->pp_children[i], i_level + 2, psz_foo );
1538     }
1539 }
1540
1541 static vlc_list_t * NewList( int i_count )
1542 {
1543     vlc_list_t * p_list = (vlc_list_t *)malloc( sizeof( vlc_list_t ) );
1544     if( p_list == NULL )
1545     {
1546         return NULL;
1547     }
1548
1549     p_list->i_count = i_count;
1550
1551     if( i_count == 0 )
1552     {
1553         p_list->p_values = NULL;
1554         return p_list;
1555     }
1556
1557     p_list->p_values = malloc( i_count * sizeof( vlc_value_t ) );
1558     if( p_list->p_values == NULL )
1559     {
1560         p_list->i_count = 0;
1561         return p_list;
1562     }
1563
1564     return p_list;
1565 }
1566
1567 static void ListReplace( vlc_list_t *p_list, vlc_object_t *p_object,
1568                          int i_index )
1569 {
1570     if( p_list == NULL || i_index >= p_list->i_count )
1571     {
1572         return;
1573     }
1574
1575     p_object->p_internals->i_refcount++;
1576
1577     p_list->p_values[i_index].p_object = p_object;
1578
1579     return;
1580 }
1581
1582 /*static void ListAppend( vlc_list_t *p_list, vlc_object_t *p_object )
1583 {
1584     if( p_list == NULL )
1585     {
1586         return;
1587     }
1588
1589     p_list->p_values = realloc( p_list->p_values, (p_list->i_count + 1)
1590                                 * sizeof( vlc_value_t ) );
1591     if( p_list->p_values == NULL )
1592     {
1593         p_list->i_count = 0;
1594         return;
1595     }
1596
1597     p_object->p_internals->i_refcount++;
1598
1599     p_list->p_values[p_list->i_count].p_object = p_object;
1600     p_list->i_count++;
1601
1602     return;
1603 }*/
1604
1605 static int CountChildren( vlc_object_t *p_this, int i_type )
1606 {
1607     vlc_object_t *p_tmp;
1608     int i, i_count = 0;
1609
1610     for( i = 0; i < p_this->i_children; i++ )
1611     {
1612         p_tmp = p_this->pp_children[i];
1613
1614         if( p_tmp->i_object_type == i_type )
1615         {
1616             i_count++;
1617         }
1618
1619         if( p_tmp->i_children )
1620         {
1621             i_count += CountChildren( p_tmp, i_type );
1622         }
1623     }
1624
1625     return i_count;
1626 }
1627
1628 static void ListChildren( vlc_list_t *p_list, vlc_object_t *p_this, int i_type )
1629 {
1630     vlc_object_t *p_tmp;
1631     int i;
1632
1633     for( i = 0; i < p_this->i_children; i++ )
1634     {
1635         p_tmp = p_this->pp_children[i];
1636
1637         if( p_tmp->i_object_type == i_type )
1638         {
1639             ListReplace( p_list, p_tmp, p_list->i_count++ );
1640         }
1641
1642         if( p_tmp->i_children )
1643         {
1644             ListChildren( p_list, p_tmp, i_type );
1645         }
1646     }
1647 }