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

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