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 1.20 2002/08/24 17:04:36 gbazin 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(vlc_t);
  76             psz_type = "root";
  77             break;
  78         case VLC_OBJECT_MODULE:
  79             i_size = sizeof(module_t);
  80             psz_type = "module";
  81             break;
  82         case VLC_OBJECT_INTF:
  83             i_size = sizeof(intf_thread_t);
  84             psz_type = "interface";
  85             break;
  86         case VLC_OBJECT_PLAYLIST:
  87             i_size = sizeof(playlist_t);
  88             psz_type = "playlist";
  89             break;
  90         case VLC_OBJECT_INPUT:
  91             i_size = sizeof(input_thread_t);
  92             psz_type = "input";
  93             break;
  94         case VLC_OBJECT_DECODER:
  95             i_size = sizeof(decoder_fifo_t);
  96             psz_type = "decoder";
  97             break;
  98         case VLC_OBJECT_VOUT:
  99             i_size = sizeof(vout_thread_t);
 100             psz_type = "video output";
 101             break;
 102         case VLC_OBJECT_AOUT:
 103             i_size = sizeof(aout_instance_t);
 104             psz_type = "audio output";
 105             break;
 106         default:
 107             i_size = i_type > sizeof(vlc_object_t)
 108                    ? i_type : sizeof(vlc_object_t);
 109             i_type = VLC_OBJECT_GENERIC;
 110             psz_type = "generic";
 111             break;
 112     }
 113
 114     p_new = malloc( i_size );
 115
 116     if( !p_new )
 117     {
 118         return NULL;
 119     }
 120
 121     memset( p_new, 0, i_size );
 122
 123     p_new->i_object_type = i_type;
 124     p_new->psz_object_type = psz_type;
 125
 126     p_new->psz_object_name = NULL;
 127
 128     p_new->i_refcount = 0;
 129     p_new->b_die = VLC_FALSE;
 130     p_new->b_error = VLC_FALSE;
 131     p_new->b_dead = VLC_FALSE;
 132     p_new->b_attached = VLC_FALSE;
 133
 134     /* If i_type is root, then p_new is our own p_vlc */
 135     if( i_type == VLC_OBJECT_ROOT )
 136     {
 137         /* We are the first object ... no need to lock. */
 138         p_new->p_vlc = (vlc_t*)p_new;
 139
 140         p_new->p_vlc->i_counter = 0;
 141         p_new->i_object_id = 0;
 142
 143         p_new->p_vlc->i_objects = 1;
 144         p_new->p_vlc->pp_objects = malloc( sizeof(vlc_object_t *) );
 145         p_new->p_vlc->pp_objects[0] = p_new;
 146         p_new->b_attached = VLC_TRUE;
 147     }
 148     else
 149     {
 150         p_new->p_vlc = p_this->p_vlc;
 151
 152         vlc_mutex_lock( &p_this->p_vlc->structure_lock );
 153
 154         p_new->p_vlc->i_counter++;
 155         p_new->i_object_id = p_new->p_vlc->i_counter;
 156
 157         /* Wooohaa! If *this* fails, we're in serious trouble! Anyway it's
 158          * useless to try and recover anything if pp_objects gets smashed. */
 159         p_new->p_vlc->i_objects++;
 160         p_new->p_vlc->pp_objects =
 161                   realloc( p_new->p_vlc->pp_objects,
 162                            p_new->p_vlc->i_objects * sizeof(vlc_object_t *) );
 163         p_new->p_vlc->pp_objects[ p_new->p_vlc->i_objects - 1 ] = p_new;
 164
 165         vlc_mutex_unlock( &p_this->p_vlc->structure_lock );
 166     }
 167
 168     p_new->p_parent = NULL;
 169     p_new->pp_children = NULL;
 170     p_new->i_children = 0;
 171
 172     p_new->p_private = NULL;
 173
 174     vlc_mutex_init( p_new, &p_new->object_lock );
 175     vlc_cond_init( p_new, &p_new->object_wait );
 176
 177     return p_new;
 178 }
 179
 180 /*****************************************************************************
 181  * vlc_object_destroy: destroy a vlc object
 182  *****************************************************************************
 183  * This function destroys an object that has been previously allocated with
 184  * vlc_object_create. The object's refcount must be zero and it must not be
 185  * attached to other objects in any way.
 186  *****************************************************************************/
 187 void __vlc_object_destroy( vlc_object_t *p_this )
 188 {
 189     int i_delay = 0;
 190
 191     if( p_this->i_children )
 192     {
 193         msg_Err( p_this, "cannot delete object with children" );
 194         vlc_dumpstructure( p_this );
 195         return;
 196     }
 197
 198     if( p_this->p_parent )
 199     {
 200         msg_Err( p_this, "cannot delete object with a parent" );
 201         vlc_dumpstructure( p_this );
 202         return;
 203     }
 204
 205     while( p_this->i_refcount )
 206     {
 207         i_delay++;
 208
 209         /* Don't warn immediately ... 100ms seems OK */
 210         if( i_delay == 2 )
 211         {
 212             msg_Warn( p_this, "refcount is %i, delaying before deletion",
 213                               p_this->i_refcount );
 214         }
 215         else if( i_delay == 12 )
 216         {
 217             msg_Err( p_this, "refcount is %i, I have a bad feeling about this",
 218                              p_this->i_refcount );
 219         }
 220         else if( i_delay == 42 )
 221         {
 222             msg_Err( p_this, "we waited too long, cancelling destruction" );
 223             return;
 224         }
 225
 226         msleep( 100000 );
 227     }
 228
 229     /* Wooohaa! If *this* fails, we're in serious trouble! Anyway it's
 230      * useless to try and recover anything if pp_objects gets smashed. */
 231     if( p_this->i_object_type != VLC_OBJECT_ROOT )
 232     {
 233         int i_index;
 234
 235         vlc_mutex_lock( &p_this->p_vlc->structure_lock );
 236
 237         i_index = FindIndex( p_this, p_this->p_vlc->pp_objects,
 238                              p_this->p_vlc->i_objects );
 239         memmove( p_this->p_vlc->pp_objects + i_index,
 240                  p_this->p_vlc->pp_objects + i_index + 1,
 241                  (p_this->p_vlc->i_objects - i_index - 1)
 242                    * sizeof( vlc_object_t *) );
 243
 244         p_this->p_vlc->pp_objects =
 245             realloc( p_this->p_vlc->pp_objects,
 246                      (p_this->p_vlc->i_objects - 1) * sizeof(vlc_object_t *) );
 247
 248         vlc_mutex_unlock( &p_this->p_vlc->structure_lock );
 249     }
 250     else
 251     {
 252         /* We are the root object ... no need to lock. */
 253         free( p_this->p_vlc->pp_objects );
 254         p_this->p_vlc->pp_objects = NULL;
 255     }
 256
 257     p_this->p_vlc->i_objects--;
 258
 259     vlc_mutex_destroy( &p_this->object_lock );
 260     vlc_cond_destroy( &p_this->object_wait );
 261
 262     free( p_this );
 263 }
 264
 265 /*****************************************************************************
 266  * vlc_object_find: find a typed object and increment its refcount
 267  *****************************************************************************
 268  * This function recursively looks for a given object type. i_mode can be one
 269  * of FIND_PARENT, FIND_CHILD or FIND_ANYWHERE.
 270  *****************************************************************************/
 271 void * __vlc_object_find( vlc_object_t *p_this, int i_type, int i_mode )
 272 {
 273     vlc_object_t *p_found;
 274
 275     vlc_mutex_lock( &p_this->p_vlc->structure_lock );
 276
 277     /* If we are of the requested type ourselves, don't look further */
 278     if( !(i_mode & FIND_STRICT) && p_this->i_object_type == i_type )
 279     {
 280         p_this->i_refcount++;
 281         vlc_mutex_unlock( &p_this->p_vlc->structure_lock );
 282         return p_this;
 283     }
 284
 285     /* Otherwise, recursively look for the object */
 286     if( (i_mode & 0x000f) == FIND_ANYWHERE )
 287     {
 288         p_found = FindObject( VLC_OBJECT(p_this->p_vlc), i_type,
 289                               (i_mode & ~0x000f) | FIND_CHILD );
 290     }
 291     else
 292     {
 293         p_found = FindObject( p_this, i_type, i_mode );
 294     }
 295
 296     vlc_mutex_unlock( &p_this->p_vlc->structure_lock );
 297
 298     return p_found;
 299 }
 300
 301 /*****************************************************************************
 302  * vlc_object_yield: increment an object refcount
 303  *****************************************************************************/
 304 void __vlc_object_yield( vlc_object_t *p_this )
 305 {
 306     vlc_mutex_lock( &p_this->p_vlc->structure_lock );
 307     p_this->i_refcount++;
 308     vlc_mutex_unlock( &p_this->p_vlc->structure_lock );
 309 }
 310
 311 /*****************************************************************************
 312  * vlc_object_release: decrement an object refcount
 313  *****************************************************************************/
 314 void __vlc_object_release( vlc_object_t *p_this )
 315 {
 316     vlc_mutex_lock( &p_this->p_vlc->structure_lock );
 317     p_this->i_refcount--;
 318     vlc_mutex_unlock( &p_this->p_vlc->structure_lock );
 319 }
 320
 321 /*****************************************************************************
 322  * vlc_object_attach: attach object to a parent object
 323  *****************************************************************************
 324  * This function sets p_this as a child of p_parent, and p_parent as a parent
 325  * of p_this. This link can be undone using vlc_object_detach.
 326  *****************************************************************************/
 327 void __vlc_object_attach( vlc_object_t *p_this, vlc_object_t *p_parent )
 328 {
 329     vlc_mutex_lock( &p_this->p_vlc->structure_lock );
 330
 331     /* Attach the parent to its child */
 332     p_this->p_parent = p_parent;
 333
 334     /* Attach the child to its parent */
 335     p_parent->i_children++;
 336     p_parent->pp_children = (vlc_object_t **)realloc( p_parent->pp_children,
 337                                p_parent->i_children * sizeof(vlc_object_t *) );
 338     p_parent->pp_children[p_parent->i_children - 1] = p_this;
 339
 340     /* Climb up the tree to see whether we are connected with the root */
 341     if( p_parent->b_attached )
 342     {
 343         SetAttachment( p_this, VLC_TRUE );
 344     }
 345
 346     vlc_mutex_unlock( &p_this->p_vlc->structure_lock );
 347 }
 348
 349 /*****************************************************************************
 350  * vlc_object_detach: detach object from its parent
 351  *****************************************************************************
 352  * This function removes all links between an object and its parent.
 353  *****************************************************************************/
 354 void __vlc_object_detach( vlc_object_t *p_this )
 355 {
 356     vlc_mutex_lock( &p_this->p_vlc->structure_lock );
 357     if( !p_this->p_parent )
 358     {
 359         msg_Err( p_this, "object is not attached" );
 360         vlc_mutex_unlock( &p_this->p_vlc->structure_lock );
 361         return;
 362     }
 363
 364     /* Climb up the tree to see whether we are connected with the root */
 365     if( p_this->p_parent->b_attached )
 366     {
 367         SetAttachment( p_this, VLC_FALSE );
 368     }
 369
 370     DetachObject( p_this );
 371     vlc_mutex_unlock( &p_this->p_vlc->structure_lock );
 372 }
 373
 374 /*****************************************************************************
 375  * vlc_list_find: find a list typed objects and increment their refcount
 376  *****************************************************************************
 377  * This function recursively looks for a given object type. i_mode can be one
 378  * of FIND_PARENT, FIND_CHILD or FIND_ANYWHERE.
 379  *****************************************************************************/
 380 vlc_list_t * __vlc_list_find( vlc_object_t *p_this, int i_type, int i_mode )
 381 {
 382     vlc_list_t *p_list = NewList();
 383
 384     vlc_mutex_lock( &p_this->p_vlc->structure_lock );
 385
 386     /* Look for the objects */
 387     if( (i_mode & 0x000f) == FIND_ANYWHERE )
 388     {
 389         vlc_object_t **pp_current, **pp_end;
 390
 391         pp_current = p_this->p_vlc->pp_objects;
 392         pp_end = pp_current + p_this->p_vlc->i_objects;
 393
 394         for( ; pp_current < pp_end ; pp_current++ )
 395         {
 396             if( (*pp_current)->b_attached
 397                  && (*pp_current)->i_object_type == i_type )
 398             {
 399                 p_list = ListAppend( p_list, *pp_current );
 400             }
 401         }
 402     }
 403     else
 404     {
 405         msg_Err( p_this, "unimplemented!" );
 406     }
 407
 408     vlc_mutex_unlock( &p_this->p_vlc->structure_lock );
 409
 410     return p_list;
 411 }
 412
 413 /*****************************************************************************
 414  * vlc_liststructure: print the current vlc objects
 415  *****************************************************************************
 416  * This function prints alist of vlc objects, and additional information such
 417  * as their refcount, thread ID, etc.
 418  *****************************************************************************/
 419 void __vlc_liststructure( vlc_object_t *p_this )
 420 {
 421     vlc_object_t **pp_current, **pp_end;
 422
 423     vlc_mutex_lock( &p_this->p_vlc->structure_lock );
 424
 425     pp_current = p_this->p_vlc->pp_objects;
 426     pp_end = pp_current + p_this->p_vlc->i_objects;
 427
 428     for( ; pp_current < pp_end ; pp_current++ )
 429     {
 430         if( (*pp_current)->b_attached )
 431         {
 432             PrintObject( *pp_current, "" );
 433         }
 434         else
 435         {
 436             msg_Info( p_this->p_vlc, "o %.6x %s (not attached)",
 437                       (*pp_current)->i_object_id,
 438                       (*pp_current)->psz_object_type );
 439         }
 440     }
 441
 442     vlc_mutex_unlock( &p_this->p_vlc->structure_lock );
 443 }
 444
 445 /*****************************************************************************
 446  * vlc_dumpstructure: print the current vlc structure
 447  *****************************************************************************
 448  * This function prints an ASCII tree showing the connections between vlc
 449  * objects, and additional information such as their refcount, thread ID, etc.
 450  *****************************************************************************/
 451 void __vlc_dumpstructure( vlc_object_t *p_this )
 452 {
 453     char psz_foo[2 * MAX_DUMPSTRUCTURE_DEPTH + 1];
 454
 455     vlc_mutex_lock( &p_this->p_vlc->structure_lock );
 456     psz_foo[0] = '|';
 457     DumpStructure( p_this, 0, psz_foo );
 458     vlc_mutex_unlock( &p_this->p_vlc->structure_lock );
 459 }
 460
 461 /*****************************************************************************
 462  * vlc_list_release: free a list previously allocated by vlc_list_find
 463  *****************************************************************************
 464  * This function decreases the refcount of all objects in the list and
 465  * frees the list.
 466  *****************************************************************************/
 467 void vlc_list_release( vlc_list_t *p_list )
 468 {
 469     if( p_list->i_count )
 470     {
 471         vlc_t *         p_vlc = p_list->pp_objects[0]->p_vlc;
 472         vlc_object_t ** pp_current = p_list->pp_objects;
 473
 474         vlc_mutex_lock( &p_vlc->structure_lock );
 475
 476         while( pp_current[0] )
 477         {
 478             pp_current[0]->i_refcount--;
 479             pp_current++;
 480         }
 481
 482         vlc_mutex_unlock( &p_vlc->structure_lock );
 483     }
 484
 485     free( p_list );
 486 }
 487
 488 /* Following functions are local */
 489
 490 /*****************************************************************************
 491  * FindIndex: find the index of an object in an array of objects
 492  *****************************************************************************
 493  * This function assumes that p_this can be found in pp_objects. It will not
 494  * crash if p_this cannot be found, but will return a wrong value. It is your
 495  * duty to check the return value if you are not certain that the object could
 496  * be found for sure.
 497  *****************************************************************************/
 498 static int FindIndex( vlc_object_t *p_this,
 499                       vlc_object_t **pp_objects, int i_count )
 500 {
 501     int i_middle = i_count / 2;
 502
 503     if( i_count == 0 )
 504     {
 505         return 0;
 506     }
 507
 508     if( pp_objects[i_middle] == p_this )
 509     {
 510         return i_middle;
 511     }
 512
 513     if( i_count == 1 )
 514     {
 515         return 0;
 516     }
 517
 518     /* We take advantage of the sorted array */
 519     if( pp_objects[i_middle]->i_object_id < p_this->i_object_id )
 520     {
 521         return i_middle + FindIndex( p_this, pp_objects + i_middle,
 522                                              i_count - i_middle );
 523     }
 524     else
 525     {
 526         return FindIndex( p_this, pp_objects, i_middle );
 527     }
 528 }
 529
 530 static vlc_object_t * FindObject( vlc_object_t *p_this, int i_type, int i_mode )
 531 {
 532     int i;
 533     vlc_object_t *p_tmp;
 534
 535     switch( i_mode & 0x000f )
 536     {
 537     case FIND_PARENT:
 538         p_tmp = p_this->p_parent;
 539         if( p_tmp )
 540         {
 541             if( p_tmp->i_object_type == i_type )
 542             {
 543                 p_tmp->i_refcount++;
 544                 return p_tmp;
 545             }
 546             else
 547             {
 548                 return FindObject( p_tmp, i_type, i_mode );
 549             }
 550         }
 551         break;
 552
 553     case FIND_CHILD:
 554         for( i = p_this->i_children; i--; )
 555         {
 556             p_tmp = p_this->pp_children[i];
 557             if( p_tmp->i_object_type == i_type )
 558             {
 559                 p_tmp->i_refcount++;
 560                 return p_tmp;
 561             }
 562             else if( p_tmp->i_children )
 563             {
 564                 p_tmp = FindObject( p_tmp, i_type, i_mode );
 565                 if( p_tmp )
 566                 {
 567                     return p_tmp;
 568                 }
 569             }
 570         }
 571         break;
 572
 573     case FIND_ANYWHERE:
 574         /* Handled in vlc_object_find */
 575         break;
 576     }
 577
 578     return NULL;
 579 }
 580
 581 static void DetachObject( vlc_object_t *p_this )
 582 {
 583     vlc_object_t *p_parent = p_this->p_parent;
 584     int i_index, i;
 585
 586     /* Remove p_this's parent */
 587     p_this->p_parent = NULL;
 588
 589     /* Remove all of p_parent's children which are p_this */
 590     for( i_index = p_parent->i_children ; i_index-- ; )
 591     {
 592         if( p_parent->pp_children[i_index] == p_this )
 593         {
 594             p_parent->i_children--;
 595             for( i = i_index ; i < p_parent->i_children ; i++ )
 596             {
 597                 p_parent->pp_children[i] = p_parent->pp_children[i+1];
 598             }
 599         }
 600     }
 601
 602     if( p_parent->i_children )
 603     {
 604         p_parent->pp_children = (vlc_object_t **)realloc( p_parent->pp_children,
 605                                p_parent->i_children * sizeof(vlc_object_t *) );
 606     }
 607     else
 608     {
 609         free( p_parent->pp_children );
 610         p_parent->pp_children = NULL;
 611     }
 612 }
 613
 614 /*****************************************************************************
 615  * SetAttachment: recursively set the b_attached flag of a subtree.
 616  *****************************************************************************
 617  * This function is used by the attach and detach functions to propagate
 618  * the b_attached flag in a subtree.
 619  *****************************************************************************/
 620 static void SetAttachment( vlc_object_t *p_this, vlc_bool_t b_attached )
 621 {
 622     int i_index;
 623
 624     for( i_index = p_this->i_children ; i_index-- ; )
 625     {
 626         SetAttachment( p_this->pp_children[i_index], b_attached );
 627     }
 628
 629     p_this->b_attached = b_attached;
 630 }
 631
 632 static void PrintObject( vlc_object_t *p_this, const char *psz_prefix )
 633 {
 634     char psz_children[20], psz_refcount[20], psz_thread[20], psz_name[50];
 635
 636     psz_name[0] = '\0';
 637     if( p_this->psz_object_name )
 638     {
 639         snprintf( psz_name, 50, " \"%s\"", p_this->psz_object_name );
 640         psz_name[48] = '\"';
 641         psz_name[49] = '\0';
 642     }
 643
 644     psz_children[0] = '\0';
 645     switch( p_this->i_children )
 646     {
 647         case 0:
 648             break;
 649         case 1:
 650             strcpy( psz_children, ", 1 child" );
 651             break;
 652         default:
 653             snprintf( psz_children, 20,
 654                       ", %i children", p_this->i_children );
 655             psz_children[19] = '\0';
 656             break;
 657     }
 658
 659     psz_refcount[0] = '\0';
 660     if( p_this->i_refcount )
 661     {
 662         snprintf( psz_refcount, 20, ", refcount %i", p_this->i_refcount );
 663         psz_refcount[19] = '\0';
 664     }
 665
 666     psz_thread[0] = '\0';
 667     if( p_this->b_thread )
 668     {
 669         snprintf( psz_thread, 20, " (thread %d)", (int)p_this->thread_id );
 670         psz_thread[19] = '\0';
 671     }
 672
 673     msg_Info( p_this->p_vlc, "%so %.6x %s%s%s%s%s", psz_prefix,
 674               p_this->i_object_id, p_this->psz_object_type,
 675               psz_name, psz_thread, psz_refcount, psz_children );
 676 }
 677
 678 static void DumpStructure( vlc_object_t *p_this, int i_level, char *psz_foo )
 679 {
 680     int i;
 681     char i_back = psz_foo[i_level];
 682     psz_foo[i_level] = '\0';
 683
 684     PrintObject( p_this, psz_foo );
 685
 686     psz_foo[i_level] = i_back;
 687
 688     if( i_level / 2 >= MAX_DUMPSTRUCTURE_DEPTH )
 689     {
 690         msg_Warn( p_this, "structure tree is too deep" );
 691         return;
 692     }
 693
 694     for( i = 0 ; i < p_this->i_children ; i++ )
 695     {
 696         if( i_level )
 697         {
 698             psz_foo[i_level-1] = ' ';
 699
 700             if( psz_foo[i_level-2] == '`' )
 701             {
 702                 psz_foo[i_level-2] = ' ';
 703             }
 704         }
 705
 706         if( i == p_this->i_children - 1 )
 707         {
 708             psz_foo[i_level] = '`';
 709         }
 710         else
 711         {
 712             psz_foo[i_level] = '|';
 713         }
 714
 715         psz_foo[i_level+1] = '-';
 716         psz_foo[i_level+2] = '\0';
 717
 718         DumpStructure( p_this->pp_children[i], i_level + 2, psz_foo );
 719     }
 720 }
 721
 722 static vlc_list_t * NewList( void )
 723 {
 724     vlc_list_t *p_list = malloc( sizeof( vlc_list_t )
 725                                      + 3 * sizeof( vlc_object_t * ) );
 726
 727     if( p_list == NULL )
 728     {
 729         return NULL;
 730     }
 731
 732     p_list->i_count = 0;
 733     p_list->pp_objects = &p_list->_p_first;
 734
 735     /* We allocated space for NULL and for three extra objects */
 736     p_list->_i_extra = 3;
 737     p_list->_p_first = NULL;
 738
 739     return p_list;
 740 }
 741
 742 static vlc_list_t * ListAppend( vlc_list_t *p_list, vlc_object_t *p_object )
 743 {
 744     if( p_list == NULL )
 745     {
 746         return NULL;
 747     }
 748
 749     if( p_list->_i_extra == 0 )
 750     {
 751         /* If we had X objects it means the array has a size of X+1, we
 752          * make it size 2X+2, so we alloc 2X+1 because there is already
 753          * one allocated in the real structure */
 754         p_list = realloc( p_list, sizeof( vlc_list_t )
 755                                    + (p_list->i_count * 2 + 1)
 756                                        * sizeof( vlc_object_t * ) );
 757         if( p_list == NULL )
 758         {
 759             return NULL;
 760         }
 761
 762         /* We have X+1 extra slots */
 763         p_list->_i_extra = p_list->i_count + 1;
 764         p_list->pp_objects = &p_list->_p_first;
 765     }
 766
 767     p_object->i_refcount++;
 768
 769     p_list->pp_objects[p_list->i_count] = p_object;
 770     p_list->i_count++;
 771     p_list->pp_objects[p_list->i_count] = NULL;
 772     p_list->_i_extra--;
 773
 774     return p_list;
 775 }
 776