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

   1 /*****************************************************************************
   2  * objects.c: vlc_object_t handling
   3  *****************************************************************************
   4  * Copyright (C) 2002 VideoLAN
   5  * $Id: objects.c,v 1.22 2002/10/03 18:56:10 sam Exp $
   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., 59 Temple Place - Suite 330, Boston, MA  02111, USA.
  22  *****************************************************************************/
  23
  24 /*****************************************************************************
  25  * Preamble
  26  *****************************************************************************/
  27 #include <vlc/vlc.h>
  28
  29 #ifdef HAVE_STDLIB_H
  30 #   include <stdlib.h>                                          /* realloc() */
  31 #endif
  32
  33 #include "stream_control.h"
  34 #include "input_ext-intf.h"
  35 #include "input_ext-dec.h"
  36
  37 #include "video.h"
  38 #include "video_output.h"
  39
  40 #include "audio_output.h"
  41 #include "aout_internal.h"
  42
  43 #include "vlc_playlist.h"
  44 #include "interface.h"
  45
  46 /*****************************************************************************
  47  * Local prototypes
  48  *****************************************************************************/
  49 static vlc_object_t * FindObject    ( vlc_object_t *, int, int );
  50 static void           DetachObject  ( vlc_object_t * );
  51 static void           PrintObject   ( vlc_object_t *, const char * );
  52 static void           DumpStructure ( vlc_object_t *, int, char * );
  53 static int            FindIndex     ( vlc_object_t *, vlc_object_t **, int );
  54 static void           SetAttachment ( vlc_object_t *, vlc_bool_t );
  55
  56 static vlc_list_t *   NewList       ( void );
  57 static vlc_list_t *   ListAppend    ( vlc_list_t *, vlc_object_t * );
  58
  59 /*****************************************************************************
  60  * vlc_object_create: initialize a vlc object
  61  *****************************************************************************
  62  * This function allocates memory for a vlc object and initializes it. If
  63  * i_type is not a known value such as VLC_OBJECT_ROOT, VLC_OBJECT_VOUT and
  64  * so on, vlc_object_create will use its value for the object size.
  65  *****************************************************************************/
  66 void * __vlc_object_create( vlc_object_t *p_this, int i_type )
  67 {
  68     vlc_object_t * p_new;
  69     char *         psz_type;
  70     size_t         i_size;
  71
  72     switch( i_type )
  73     {
  74         case VLC_OBJECT_ROOT:
  75             i_size = sizeof(libvlc_t);
  76             psz_type = "root";
  77             break;
  78         case VLC_OBJECT_VLC:
  79             i_size = sizeof(vlc_t);
  80             psz_type = "vlc";
  81             break;
  82         case VLC_OBJECT_MODULE:
  83             i_size = sizeof(module_t);
  84             psz_type = "module";
  85             break;
  86         case VLC_OBJECT_INTF:
  87             i_size = sizeof(intf_thread_t);
  88             psz_type = "interface";
  89             break;
  90         case VLC_OBJECT_PLAYLIST:
  91             i_size = sizeof(playlist_t);
  92             psz_type = "playlist";
  93             break;
  94         case VLC_OBJECT_INPUT:
  95             i_size = sizeof(input_thread_t);
  96             psz_type = "input";
  97             break;
  98         case VLC_OBJECT_DECODER:
  99             i_size = sizeof(decoder_fifo_t);
 100             psz_type = "decoder";
 101             break;
 102         case VLC_OBJECT_VOUT:
 103             i_size = sizeof(vout_thread_t);
 104             psz_type = "video output";
 105             break;
 106         case VLC_OBJECT_AOUT:
 107             i_size = sizeof(aout_instance_t);
 108             psz_type = "audio output";
 109             break;
 110         default:
 111             i_size = i_type > sizeof(vlc_object_t)
 112                    ? i_type : sizeof(vlc_object_t);
 113             i_type = VLC_OBJECT_GENERIC;
 114             psz_type = "generic";
 115             break;
 116     }
 117
 118     if( i_type == VLC_OBJECT_ROOT )
 119     {
 120         p_new = p_this;
 121     }
 122     else
 123     {
 124         p_new = malloc( i_size );
 125
 126         if( !p_new )
 127         {
 128             return NULL;
 129         }
 130
 131         memset( p_new, 0, i_size );
 132     }
 133
 134     p_new->i_object_type = i_type;
 135     p_new->psz_object_type = psz_type;
 136
 137     p_new->psz_object_name = NULL;
 138
 139     p_new->i_refcount = 0;
 140     p_new->b_die = VLC_FALSE;
 141     p_new->b_error = VLC_FALSE;
 142     p_new->b_dead = VLC_FALSE;
 143     p_new->b_attached = VLC_FALSE;
 144
 145     /* If i_type is root, then p_new is our own p_libvlc */
 146     if( i_type == VLC_OBJECT_ROOT )
 147     {
 148         /* We are the first object ... no need to lock. */
 149         p_new->p_libvlc = (libvlc_t*)p_new;
 150         p_new->p_vlc = NULL;
 151
 152         p_new->p_libvlc->i_counter = 0;
 153         p_new->i_object_id = 0;
 154
 155         p_new->p_libvlc->i_objects = 1;
 156         p_new->p_libvlc->pp_objects = malloc( sizeof(vlc_object_t *) );
 157         p_new->p_libvlc->pp_objects[0] = p_new;
 158         p_new->b_attached = VLC_TRUE;
 159     }
 160     else
 161     {
 162         p_new->p_libvlc = p_this->p_libvlc;
 163         p_new->p_vlc = ( i_type == VLC_OBJECT_VLC ) ? (vlc_t*)p_new
 164                                                     : p_this->p_vlc;
 165
 166         vlc_mutex_lock( &p_this->p_libvlc->structure_lock );
 167
 168         p_new->p_libvlc->i_counter++;
 169         p_new->i_object_id = p_new->p_libvlc->i_counter;
 170
 171         /* Wooohaa! If *this* fails, we're in serious trouble! Anyway it's
 172          * useless to try and recover anything if pp_objects gets smashed. */
 173         p_new->p_libvlc->i_objects++;
 174         p_new->p_libvlc->pp_objects =
 175                 realloc( p_new->p_libvlc->pp_objects,
 176                          p_new->p_libvlc->i_objects * sizeof(vlc_object_t *) );
 177         p_new->p_libvlc->pp_objects[ p_new->p_libvlc->i_objects - 1 ] = p_new;
 178
 179         vlc_mutex_unlock( &p_this->p_libvlc->structure_lock );
 180     }
 181
 182     p_new->p_parent = NULL;
 183     p_new->pp_children = NULL;
 184     p_new->i_children = 0;
 185
 186     p_new->p_private = NULL;
 187
 188     vlc_mutex_init( p_new, &p_new->object_lock );
 189     vlc_cond_init( p_new, &p_new->object_wait );
 190
 191     return p_new;
 192 }
 193
 194 /*****************************************************************************
 195  * vlc_object_destroy: destroy a vlc object
 196  *****************************************************************************
 197  * This function destroys an object that has been previously allocated with
 198  * vlc_object_create. The object's refcount must be zero and it must not be
 199  * attached to other objects in any way.
 200  *****************************************************************************/
 201 void __vlc_object_destroy( vlc_object_t *p_this )
 202 {
 203     int i_delay = 0;
 204
 205     if( p_this->i_children )
 206     {
 207         msg_Err( p_this, "cannot delete object with children" );
 208         vlc_dumpstructure( p_this );
 209         return;
 210     }
 211
 212     if( p_this->p_parent )
 213     {
 214         msg_Err( p_this, "cannot delete object with a parent" );
 215         vlc_dumpstructure( p_this );
 216         return;
 217     }
 218
 219     while( p_this->i_refcount )
 220     {
 221         i_delay++;
 222
 223         /* Don't warn immediately ... 100ms seems OK */
 224         if( i_delay == 2 )
 225         {
 226             msg_Warn( p_this, "refcount is %i, delaying before deletion",
 227                               p_this->i_refcount );
 228         }
 229         else if( i_delay == 12 )
 230         {
 231             msg_Err( p_this, "refcount is %i, I have a bad feeling about this",
 232                              p_this->i_refcount );
 233         }
 234         else if( i_delay == 42 )
 235         {
 236             msg_Err( p_this, "we waited too long, cancelling destruction" );
 237             return;
 238         }
 239
 240         msleep( 100000 );
 241     }
 242
 243     /* Wooohaa! If *this* fails, we're in serious trouble! Anyway it's
 244      * useless to try and recover anything if pp_objects gets smashed. */
 245     if( p_this->i_object_type != VLC_OBJECT_ROOT )
 246     {
 247         int i_index;
 248
 249         vlc_mutex_lock( &p_this->p_libvlc->structure_lock );
 250
 251         i_index = FindIndex( p_this, p_this->p_libvlc->pp_objects,
 252                              p_this->p_libvlc->i_objects );
 253         memmove( p_this->p_libvlc->pp_objects + i_index,
 254                  p_this->p_libvlc->pp_objects + i_index + 1,
 255                  (p_this->p_libvlc->i_objects - i_index - 1)
 256                    * sizeof( vlc_object_t *) );
 257
 258         p_this->p_libvlc->pp_objects =
 259             realloc( p_this->p_libvlc->pp_objects,
 260                  (p_this->p_libvlc->i_objects - 1) * sizeof(vlc_object_t *) );
 261
 262         vlc_mutex_unlock( &p_this->p_libvlc->structure_lock );
 263     }
 264     else
 265     {
 266         /* We are the root object ... no need to lock. */
 267         free( p_this->p_libvlc->pp_objects );
 268         p_this->p_libvlc->pp_objects = NULL;
 269     }
 270
 271     p_this->p_libvlc->i_objects--;
 272
 273     vlc_mutex_destroy( &p_this->object_lock );
 274     vlc_cond_destroy( &p_this->object_wait );
 275
 276     free( p_this );
 277 }
 278
 279 /*****************************************************************************
 280  * vlc_object_find: find a typed object and increment its refcount
 281  *****************************************************************************
 282  * This function recursively looks for a given object type. i_mode can be one
 283  * of FIND_PARENT, FIND_CHILD or FIND_ANYWHERE.
 284  *****************************************************************************/
 285 void * __vlc_object_find( vlc_object_t *p_this, int i_type, int i_mode )
 286 {
 287     vlc_object_t *p_found;
 288
 289     vlc_mutex_lock( &p_this->p_libvlc->structure_lock );
 290
 291     /* If we are of the requested type ourselves, don't look further */
 292     if( !(i_mode & FIND_STRICT) && p_this->i_object_type == i_type )
 293     {
 294         p_this->i_refcount++;
 295         vlc_mutex_unlock( &p_this->p_libvlc->structure_lock );
 296         return p_this;
 297     }
 298
 299     /* Otherwise, recursively look for the object */
 300     if( (i_mode & 0x000f) == FIND_ANYWHERE )
 301     {
 302         p_found = FindObject( VLC_OBJECT(p_this->p_vlc), i_type,
 303                               (i_mode & ~0x000f) | FIND_CHILD );
 304     }
 305     else
 306     {
 307         p_found = FindObject( p_this, i_type, i_mode );
 308     }
 309
 310     vlc_mutex_unlock( &p_this->p_libvlc->structure_lock );
 311
 312     return p_found;
 313 }
 314
 315 /*****************************************************************************
 316  * vlc_object_yield: increment an object refcount
 317  *****************************************************************************/
 318 void __vlc_object_yield( vlc_object_t *p_this )
 319 {
 320     vlc_mutex_lock( &p_this->p_libvlc->structure_lock );
 321     p_this->i_refcount++;
 322     vlc_mutex_unlock( &p_this->p_libvlc->structure_lock );
 323 }
 324
 325 /*****************************************************************************
 326  * vlc_object_release: decrement an object refcount
 327  *****************************************************************************/
 328 void __vlc_object_release( vlc_object_t *p_this )
 329 {
 330     vlc_mutex_lock( &p_this->p_libvlc->structure_lock );
 331     p_this->i_refcount--;
 332     vlc_mutex_unlock( &p_this->p_libvlc->structure_lock );
 333 }
 334
 335 /*****************************************************************************
 336  * vlc_object_attach: attach object to a parent object
 337  *****************************************************************************
 338  * This function sets p_this as a child of p_parent, and p_parent as a parent
 339  * of p_this. This link can be undone using vlc_object_detach.
 340  *****************************************************************************/
 341 void __vlc_object_attach( vlc_object_t *p_this, vlc_object_t *p_parent )
 342 {
 343     vlc_mutex_lock( &p_this->p_libvlc->structure_lock );
 344
 345     /* Attach the parent to its child */
 346     p_this->p_parent = p_parent;
 347
 348     /* Attach the child to its parent */
 349     p_parent->i_children++;
 350     p_parent->pp_children = (vlc_object_t **)realloc( p_parent->pp_children,
 351                                p_parent->i_children * sizeof(vlc_object_t *) );
 352     p_parent->pp_children[p_parent->i_children - 1] = p_this;
 353
 354     /* Climb up the tree to see whether we are connected with the root */
 355     if( p_parent->b_attached )
 356     {
 357         SetAttachment( p_this, VLC_TRUE );
 358     }
 359
 360     vlc_mutex_unlock( &p_this->p_libvlc->structure_lock );
 361 }
 362
 363 /*****************************************************************************
 364  * vlc_object_detach: detach object from its parent
 365  *****************************************************************************
 366  * This function removes all links between an object and its parent.
 367  *****************************************************************************/
 368 void __vlc_object_detach( vlc_object_t *p_this )
 369 {
 370     vlc_mutex_lock( &p_this->p_libvlc->structure_lock );
 371     if( !p_this->p_parent )
 372     {
 373         msg_Err( p_this, "object is not attached" );
 374         vlc_mutex_unlock( &p_this->p_libvlc->structure_lock );
 375         return;
 376     }
 377
 378     /* Climb up the tree to see whether we are connected with the root */
 379     if( p_this->p_parent->b_attached )
 380     {
 381         SetAttachment( p_this, VLC_FALSE );
 382     }
 383
 384     DetachObject( p_this );
 385     vlc_mutex_unlock( &p_this->p_libvlc->structure_lock );
 386 }
 387
 388 /*****************************************************************************
 389  * vlc_list_find: find a list typed objects and increment their refcount
 390  *****************************************************************************
 391  * This function recursively looks for a given object type. i_mode can be one
 392  * of FIND_PARENT, FIND_CHILD or FIND_ANYWHERE.
 393  *****************************************************************************/
 394 vlc_list_t * __vlc_list_find( vlc_object_t *p_this, int i_type, int i_mode )
 395 {
 396     vlc_list_t *p_list = NewList();
 397
 398     vlc_mutex_lock( &p_this->p_libvlc->structure_lock );
 399
 400     /* Look for the objects */
 401     if( (i_mode & 0x000f) == FIND_ANYWHERE )
 402     {
 403         vlc_object_t **pp_current, **pp_end;
 404
 405         pp_current = p_this->p_libvlc->pp_objects;
 406         pp_end = pp_current + p_this->p_libvlc->i_objects;
 407
 408         for( ; pp_current < pp_end ; pp_current++ )
 409         {
 410             if( (*pp_current)->b_attached
 411                  && (*pp_current)->i_object_type == i_type )
 412             {
 413                 p_list = ListAppend( p_list, *pp_current );
 414             }
 415         }
 416     }
 417     else
 418     {
 419         msg_Err( p_this, "unimplemented!" );
 420     }
 421
 422     vlc_mutex_unlock( &p_this->p_libvlc->structure_lock );
 423
 424     return p_list;
 425 }
 426
 427 /*****************************************************************************
 428  * vlc_liststructure: print the current vlc objects
 429  *****************************************************************************
 430  * This function prints alist of vlc objects, and additional information such
 431  * as their refcount, thread ID, etc.
 432  *****************************************************************************/
 433 void __vlc_liststructure( vlc_object_t *p_this )
 434 {
 435     vlc_object_t **pp_current, **pp_end;
 436
 437     vlc_mutex_lock( &p_this->p_libvlc->structure_lock );
 438
 439     pp_current = p_this->p_libvlc->pp_objects;
 440     pp_end = pp_current + p_this->p_libvlc->i_objects;
 441
 442     for( ; pp_current < pp_end ; pp_current++ )
 443     {
 444         if( (*pp_current)->b_attached )
 445         {
 446             PrintObject( *pp_current, "" );
 447         }
 448         else
 449         {
 450             printf( " o %.6x %s (not attached)\n",
 451                     (*pp_current)->i_object_id,
 452                     (*pp_current)->psz_object_type );
 453         }
 454     }
 455
 456     vlc_mutex_unlock( &p_this->p_libvlc->structure_lock );
 457 }
 458
 459 /*****************************************************************************
 460  * vlc_dumpstructure: print the current vlc structure
 461  *****************************************************************************
 462  * This function prints an ASCII tree showing the connections between vlc
 463  * objects, and additional information such as their refcount, thread ID, etc.
 464  *****************************************************************************/
 465 void __vlc_dumpstructure( vlc_object_t *p_this )
 466 {
 467     char psz_foo[2 * MAX_DUMPSTRUCTURE_DEPTH + 1];
 468
 469     vlc_mutex_lock( &p_this->p_libvlc->structure_lock );
 470     psz_foo[0] = '|';
 471     DumpStructure( p_this, 0, psz_foo );
 472     vlc_mutex_unlock( &p_this->p_libvlc->structure_lock );
 473 }
 474
 475 /*****************************************************************************
 476  * vlc_list_release: free a list previously allocated by vlc_list_find
 477  *****************************************************************************
 478  * This function decreases the refcount of all objects in the list and
 479  * frees the list.
 480  *****************************************************************************/
 481 void vlc_list_release( vlc_list_t *p_list )
 482 {
 483     if( p_list->i_count )
 484     {
 485         libvlc_t *      p_libvlc = p_list->pp_objects[0]->p_libvlc;
 486         vlc_object_t ** pp_current = p_list->pp_objects;
 487
 488         vlc_mutex_lock( &p_libvlc->structure_lock );
 489
 490         while( pp_current[0] )
 491         {
 492             pp_current[0]->i_refcount--;
 493             pp_current++;
 494         }
 495
 496         vlc_mutex_unlock( &p_libvlc->structure_lock );
 497     }
 498
 499     free( p_list );
 500 }
 501
 502 /* Following functions are local */
 503
 504 /*****************************************************************************
 505  * FindIndex: find the index of an object in an array of objects
 506  *****************************************************************************
 507  * This function assumes that p_this can be found in pp_objects. It will not
 508  * crash if p_this cannot be found, but will return a wrong value. It is your
 509  * duty to check the return value if you are not certain that the object could
 510  * be found for sure.
 511  *****************************************************************************/
 512 static int FindIndex( vlc_object_t *p_this,
 513                       vlc_object_t **pp_objects, int i_count )
 514 {
 515     int i_middle = i_count / 2;
 516
 517     if( i_count == 0 )
 518     {
 519         return 0;
 520     }
 521
 522     if( pp_objects[i_middle] == p_this )
 523     {
 524         return i_middle;
 525     }
 526
 527     if( i_count == 1 )
 528     {
 529         return 0;
 530     }
 531
 532     /* We take advantage of the sorted array */
 533     if( pp_objects[i_middle]->i_object_id < p_this->i_object_id )
 534     {
 535         return i_middle + FindIndex( p_this, pp_objects + i_middle,
 536                                              i_count - i_middle );
 537     }
 538     else
 539     {
 540         return FindIndex( p_this, pp_objects, i_middle );
 541     }
 542 }
 543
 544 static vlc_object_t * FindObject( vlc_object_t *p_this, int i_type, int i_mode )
 545 {
 546     int i;
 547     vlc_object_t *p_tmp;
 548
 549     switch( i_mode & 0x000f )
 550     {
 551     case FIND_PARENT:
 552         p_tmp = p_this->p_parent;
 553         if( p_tmp )
 554         {
 555             if( p_tmp->i_object_type == i_type )
 556             {
 557                 p_tmp->i_refcount++;
 558                 return p_tmp;
 559             }
 560             else
 561             {
 562                 return FindObject( p_tmp, i_type, i_mode );
 563             }
 564         }
 565         break;
 566
 567     case FIND_CHILD:
 568         for( i = p_this->i_children; i--; )
 569         {
 570             p_tmp = p_this->pp_children[i];
 571             if( p_tmp->i_object_type == i_type )
 572             {
 573                 p_tmp->i_refcount++;
 574                 return p_tmp;
 575             }
 576             else if( p_tmp->i_children )
 577             {
 578                 p_tmp = FindObject( p_tmp, i_type, i_mode );
 579                 if( p_tmp )
 580                 {
 581                     return p_tmp;
 582                 }
 583             }
 584         }
 585         break;
 586
 587     case FIND_ANYWHERE:
 588         /* Handled in vlc_object_find */
 589         break;
 590     }
 591
 592     return NULL;
 593 }
 594
 595 static void DetachObject( vlc_object_t *p_this )
 596 {
 597     vlc_object_t *p_parent = p_this->p_parent;
 598     int i_index, i;
 599
 600     /* Remove p_this's parent */
 601     p_this->p_parent = NULL;
 602
 603     /* Remove all of p_parent's children which are p_this */
 604     for( i_index = p_parent->i_children ; i_index-- ; )
 605     {
 606         if( p_parent->pp_children[i_index] == p_this )
 607         {
 608             p_parent->i_children--;
 609             for( i = i_index ; i < p_parent->i_children ; i++ )
 610             {
 611                 p_parent->pp_children[i] = p_parent->pp_children[i+1];
 612             }
 613         }
 614     }
 615
 616     if( p_parent->i_children )
 617     {
 618         p_parent->pp_children = (vlc_object_t **)realloc( p_parent->pp_children,
 619                                p_parent->i_children * sizeof(vlc_object_t *) );
 620     }
 621     else
 622     {
 623         free( p_parent->pp_children );
 624         p_parent->pp_children = NULL;
 625     }
 626 }
 627
 628 /*****************************************************************************
 629  * SetAttachment: recursively set the b_attached flag of a subtree.
 630  *****************************************************************************
 631  * This function is used by the attach and detach functions to propagate
 632  * the b_attached flag in a subtree.
 633  *****************************************************************************/
 634 static void SetAttachment( vlc_object_t *p_this, vlc_bool_t b_attached )
 635 {
 636     int i_index;
 637
 638     for( i_index = p_this->i_children ; i_index-- ; )
 639     {
 640         SetAttachment( p_this->pp_children[i_index], b_attached );
 641     }
 642
 643     p_this->b_attached = b_attached;
 644 }
 645
 646 static void PrintObject( vlc_object_t *p_this, const char *psz_prefix )
 647 {
 648     char psz_children[20], psz_refcount[20], psz_thread[20], psz_name[50];
 649
 650     psz_name[0] = '\0';
 651     if( p_this->psz_object_name )
 652     {
 653         snprintf( psz_name, 50, " \"%s\"", p_this->psz_object_name );
 654         psz_name[48] = '\"';
 655         psz_name[49] = '\0';
 656     }
 657
 658     psz_children[0] = '\0';
 659     switch( p_this->i_children )
 660     {
 661         case 0:
 662             break;
 663         case 1:
 664             strcpy( psz_children, ", 1 child" );
 665             break;
 666         default:
 667             snprintf( psz_children, 20,
 668                       ", %i children", p_this->i_children );
 669             psz_children[19] = '\0';
 670             break;
 671     }
 672
 673     psz_refcount[0] = '\0';
 674     if( p_this->i_refcount )
 675     {
 676         snprintf( psz_refcount, 20, ", refcount %i", p_this->i_refcount );
 677         psz_refcount[19] = '\0';
 678     }
 679
 680     psz_thread[0] = '\0';
 681     if( p_this->b_thread )
 682     {
 683         snprintf( psz_thread, 20, " (thread %d)", (int)p_this->thread_id );
 684         psz_thread[19] = '\0';
 685     }
 686
 687     printf( " %so %.6x %s%s%s%s%s\n", psz_prefix,
 688             p_this->i_object_id, p_this->psz_object_type,
 689             psz_name, psz_thread, psz_refcount, psz_children );
 690 }
 691
 692 static void DumpStructure( vlc_object_t *p_this, int i_level, char *psz_foo )
 693 {
 694     int i;
 695     char i_back = psz_foo[i_level];
 696     psz_foo[i_level] = '\0';
 697
 698     PrintObject( p_this, psz_foo );
 699
 700     psz_foo[i_level] = i_back;
 701
 702     if( i_level / 2 >= MAX_DUMPSTRUCTURE_DEPTH )
 703     {
 704         msg_Warn( p_this, "structure tree is too deep" );
 705         return;
 706     }
 707
 708     for( i = 0 ; i < p_this->i_children ; i++ )
 709     {
 710         if( i_level )
 711         {
 712             psz_foo[i_level-1] = ' ';
 713
 714             if( psz_foo[i_level-2] == '`' )
 715             {
 716                 psz_foo[i_level-2] = ' ';
 717             }
 718         }
 719
 720         if( i == p_this->i_children - 1 )
 721         {
 722             psz_foo[i_level] = '`';
 723         }
 724         else
 725         {
 726             psz_foo[i_level] = '|';
 727         }
 728
 729         psz_foo[i_level+1] = '-';
 730         psz_foo[i_level+2] = '\0';
 731
 732         DumpStructure( p_this->pp_children[i], i_level + 2, psz_foo );
 733     }
 734 }
 735
 736 static vlc_list_t * NewList( void )
 737 {
 738     vlc_list_t *p_list = malloc( sizeof( vlc_list_t )
 739                                      + 3 * sizeof( vlc_object_t * ) );
 740
 741     if( p_list == NULL )
 742     {
 743         return NULL;
 744     }
 745
 746     p_list->i_count = 0;
 747     p_list->pp_objects = &p_list->_p_first;
 748
 749     /* We allocated space for NULL and for three extra objects */
 750     p_list->_i_extra = 3;
 751     p_list->_p_first = NULL;
 752
 753     return p_list;
 754 }
 755
 756 static vlc_list_t * ListAppend( vlc_list_t *p_list, vlc_object_t *p_object )
 757 {
 758     if( p_list == NULL )
 759     {
 760         return NULL;
 761     }
 762
 763     if( p_list->_i_extra == 0 )
 764     {
 765         /* If we had X objects it means the array has a size of X+1, we
 766          * make it size 2X+2, so we alloc 2X+1 because there is already
 767          * one allocated in the real structure */
 768         p_list = realloc( p_list, sizeof( vlc_list_t )
 769                                    + (p_list->i_count * 2 + 1)
 770                                        * sizeof( vlc_object_t * ) );
 771         if( p_list == NULL )
 772         {
 773             return NULL;
 774         }
 775
 776         /* We have X+1 extra slots */
 777         p_list->_i_extra = p_list->i_count + 1;
 778         p_list->pp_objects = &p_list->_p_first;
 779     }
 780
 781     p_object->i_refcount++;
 782
 783     p_list->pp_objects[p_list->i_count] = p_object;
 784     p_list->i_count++;
 785     p_list->pp_objects[p_list->i_count] = NULL;
 786     p_list->_i_extra--;
 787
 788     return p_list;
 789 }
 790