git.sesse.net Git - vlc/blob - src/playlist/engine.c

   1 /*****************************************************************************
   2  * engine.c : Run the playlist and handle its control
   3  *****************************************************************************
   4  * Copyright (C) 1999-2007 the VideoLAN team
   5  * $Id$
   6  *
   7  * Authors: Samuel Hocevar <sam@zoy.org>
   8  *          Clément Stenac <zorglub@videolan.org>
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License as published by
  12  * the Free Software Foundation; either version 2 of the License, or
  13  * (at your option) any later version.
  14  *
  15  * This program is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18  * GNU General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU General Public License
  21  * along with this program; if not, write to the Free Software
  22  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
  23  *****************************************************************************/
  24
  25 #ifdef HAVE_CONFIG_H
  26 # include "config.h"
  27 #endif
  28
  29 #include <vlc/vlc.h>
  30 #include <vlc_vout.h>
  31 #include <vlc_sout.h>
  32 #include <vlc_playlist.h>
  33 #include <vlc_interface.h>
  34 #include "playlist_internal.h"
  35 #include "stream_output/stream_output.h" /* sout_DeleteInstance */
  36
  37 /*****************************************************************************
  38  * Local prototypes
  39  *****************************************************************************/
  40 static void VariablesInit( playlist_t *p_playlist );
  41 static void playlist_Destructor( vlc_object_t * p_this );
  42
  43 static int RandomCallback( vlc_object_t *p_this, char const *psz_cmd,
  44                            vlc_value_t oldval, vlc_value_t newval, void *a )
  45 {
  46     (void)psz_cmd; (void)oldval; (void)newval; (void)a;
  47
  48     ((playlist_t*)p_this)->b_reset_currently_playing = VLC_TRUE;
  49     playlist_Signal( ((playlist_t*)p_this) );
  50     return VLC_SUCCESS;
  51 }
  52
  53 /**
  54  * Create playlist
  55  *
  56  * Create a playlist structure.
  57  * \param p_parent the vlc object that is to be the parent of this playlist
  58  * \return a pointer to the created playlist, or NULL on error
  59  */
  60 playlist_t * playlist_Create( vlc_object_t *p_parent )
  61 {
  62     static const char playlist_name[] = "playlist";
  63     playlist_t *p_playlist;
  64     vlc_bool_t b_save;
  65     int i_tree;
  66
  67     /* Allocate structure */
  68     p_playlist = vlc_custom_create( p_parent, sizeof( *p_playlist ),
  69                                     VLC_OBJECT_PLAYLIST, playlist_name );
  70     if( !p_playlist )
  71     {
  72         msg_Err( p_parent, "out of memory" );
  73         return NULL;
  74     }
  75
  76     TAB_INIT( p_playlist->i_sds, p_playlist->pp_sds );
  77
  78     p_parent->p_libvlc->p_playlist = p_playlist;
  79
  80     VariablesInit( p_playlist );
  81
  82     /* Initialise data structures */
  83     vlc_mutex_init( p_playlist, &p_playlist->gc_lock );
  84     p_playlist->i_last_playlist_id = 0;
  85     p_playlist->p_input = NULL;
  86
  87     p_playlist->gc_date = 0;
  88     p_playlist->b_cant_sleep = VLC_FALSE;
  89
  90     ARRAY_INIT( p_playlist->items );
  91     ARRAY_INIT( p_playlist->all_items );
  92     ARRAY_INIT( p_playlist->current );
  93
  94     p_playlist->i_current_index = 0;
  95     p_playlist->b_reset_currently_playing = VLC_TRUE;
  96     p_playlist->last_rebuild_date = 0;
  97
  98     i_tree = var_CreateGetBool( p_playlist, "playlist-tree" );
  99     p_playlist->b_always_tree = (i_tree == 1);
 100     p_playlist->b_never_tree = (i_tree == 2);
 101
 102     p_playlist->b_doing_ml = VLC_FALSE;
 103
 104     p_playlist->b_auto_preparse =
 105                         var_CreateGetBool( p_playlist, "auto-preparse" ) ;
 106
 107     p_playlist->p_root_category = playlist_NodeCreate( p_playlist, NULL, NULL,
 108                                     0, NULL );
 109     p_playlist->p_root_onelevel = playlist_NodeCreate( p_playlist, NULL, NULL,
 110                                     0, p_playlist->p_root_category->p_input );
 111
 112     if( !p_playlist->p_root_category || !p_playlist->p_root_onelevel )
 113         return NULL;
 114
 115     /* Create playlist and media library */
 116     playlist_NodesPairCreate( p_playlist, _( "Playlist" ),
 117                             &p_playlist->p_local_category,
 118                             &p_playlist->p_local_onelevel, VLC_FALSE );
 119
 120     p_playlist->p_local_category->i_flags |= PLAYLIST_RO_FLAG;
 121     p_playlist->p_local_onelevel->i_flags |= PLAYLIST_RO_FLAG;
 122
 123     if( !p_playlist->p_local_category || !p_playlist->p_local_onelevel ||
 124         !p_playlist->p_local_category->p_input ||
 125         !p_playlist->p_local_onelevel->p_input )
 126         return NULL;
 127
 128     if( config_GetInt( p_playlist, "media-library") )
 129     {
 130         playlist_NodesPairCreate( p_playlist, _( "Media Library" ),
 131                             &p_playlist->p_ml_category,
 132                             &p_playlist->p_ml_onelevel, VLC_FALSE );
 133
 134         if(!p_playlist->p_ml_category || !p_playlist->p_ml_onelevel)
 135             return NULL;
 136
 137         p_playlist->p_ml_category->i_flags |= PLAYLIST_RO_FLAG;
 138         p_playlist->p_ml_onelevel->i_flags |= PLAYLIST_RO_FLAG;
 139     }
 140     else
 141     {
 142         p_playlist->p_ml_category = p_playlist->p_ml_onelevel = NULL;
 143     }
 144
 145     /* Initial status */
 146     p_playlist->status.p_item = NULL;
 147     p_playlist->status.p_node = p_playlist->p_local_onelevel;
 148     p_playlist->request.b_request = VLC_FALSE;
 149     p_playlist->status.i_status = PLAYLIST_STOPPED;
 150
 151     p_playlist->i_sort = SORT_ID;
 152     p_playlist->i_order = ORDER_NORMAL;
 153
 154
 155     b_save = p_playlist->b_auto_preparse;
 156     p_playlist->b_auto_preparse = VLC_FALSE;
 157     playlist_MLLoad( p_playlist );
 158     p_playlist->b_auto_preparse = VLC_TRUE;
 159
 160     vlc_object_set_destructor( p_playlist, playlist_Destructor );
 161
 162     return p_playlist;
 163 }
 164
 165 /**
 166  * Destroy playlist
 167  *
 168  * Destroy a playlist structure.
 169  * \param p_playlist the playlist object
 170  * \return nothing
 171  */
 172 void playlist_Destroy( playlist_t *p_playlist )
 173 {
 174     /* XXX: should go in the playlist destructor */
 175     var_Destroy( p_playlist, "intf-change" );
 176     var_Destroy( p_playlist, "item-change" );
 177     var_Destroy( p_playlist, "playlist-current" );
 178     var_Destroy( p_playlist, "intf-popupmenu" );
 179     var_Destroy( p_playlist, "intf-show" );
 180     var_Destroy( p_playlist, "play-and-stop" );
 181     var_Destroy( p_playlist, "play-and-exit" );
 182     var_Destroy( p_playlist, "random" );
 183     var_Destroy( p_playlist, "repeat" );
 184     var_Destroy( p_playlist, "loop" );
 185     var_Destroy( p_playlist, "activity" );
 186
 187     vlc_object_release( p_playlist );
 188 }
 189
 190 static void playlist_Destructor( vlc_object_t * p_this )
 191 {
 192     playlist_t * p_playlist = (playlist_t *)p_this;
 193
 194     // Kill preparser
 195     if( p_playlist->p_preparse )
 196     {
 197         vlc_object_release( p_playlist->p_preparse );
 198     }
 199
 200     // Kill meta fetcher
 201     if( p_playlist->p_fetcher )
 202     {
 203         vlc_object_release( p_playlist->p_fetcher );
 204     }
 205 }
 206
 207 /* Destroy remaining objects */
 208 static void ObjectGarbageCollector( playlist_t *p_playlist, vlc_bool_t b_force )
 209 {
 210     vlc_object_t *p_obj;
 211
 212     if( !b_force )
 213     {
 214         if( mdate() - p_playlist->gc_date < 1000000 )
 215         {
 216             p_playlist->b_cant_sleep = VLC_TRUE;
 217             return;
 218         }
 219         else if( p_playlist->gc_date == 0 )
 220             return;
 221     }
 222
 223     vlc_mutex_lock( &p_playlist->gc_lock );
 224     while( ( p_obj = vlc_object_find( p_playlist->p_libvlc, VLC_OBJECT_VOUT,
 225                                                   FIND_CHILD ) ) )
 226     {
 227         if( p_obj->p_parent != VLC_OBJECT(p_playlist->p_libvlc) )
 228         {
 229             vlc_object_release( p_obj );
 230             break;
 231         }
 232         msg_Dbg( p_playlist, "garbage collector destroying 1 vout" );
 233         vlc_object_detach( p_obj );
 234         vlc_object_release( p_obj );
 235         vout_Destroy( (vout_thread_t *)p_obj );
 236     }
 237     while( ( p_obj = vlc_object_find( p_playlist, VLC_OBJECT_SOUT,
 238                                                   FIND_CHILD ) ) )
 239     {
 240         if( p_obj->p_parent != VLC_OBJECT(p_playlist) )
 241         {
 242             vlc_object_release( p_obj );
 243             break;
 244         }
 245         msg_Dbg( p_playlist, "garbage collector destroying 1 sout" );
 246         vlc_object_detach( p_obj );
 247         vlc_object_release( p_obj );
 248         sout_DeleteInstance( (sout_instance_t*)p_obj );
 249     }
 250     p_playlist->b_cant_sleep = VLC_FALSE;
 251     vlc_mutex_unlock( &p_playlist->gc_lock );
 252 }
 253
 254 /**
 255  * Main loop
 256  *
 257  * Main loop for the playlist
 258  * \param p_playlist the playlist object
 259  * \return nothing
 260  */
 261 void playlist_MainLoop( playlist_t *p_playlist )
 262 {
 263     playlist_item_t *p_item = NULL;
 264     vlc_bool_t b_playexit = var_GetBool( p_playlist, "play-and-exit" );
 265     PL_LOCK;
 266
 267     if( p_playlist->b_reset_currently_playing &&
 268         mdate() - p_playlist->last_rebuild_date > 30000 ) // 30 ms
 269     {
 270         ResetCurrentlyPlaying( p_playlist, var_GetBool( p_playlist, "random" ),
 271                              p_playlist->status.p_item );
 272         p_playlist->last_rebuild_date = mdate();
 273     }
 274
 275 check_input:
 276     /* If there is an input, check that it doesn't need to die. */
 277     if( p_playlist->p_input )
 278     {
 279         if( p_playlist->request.b_request && !p_playlist->p_input->b_die )
 280         {
 281             PL_DEBUG( "incoming request - stopping current input" );
 282             input_StopThread( p_playlist->p_input );
 283         }
 284
 285         /* This input is dead. Remove it ! */
 286         if( p_playlist->p_input->b_dead )
 287         {
 288             int i_activity;
 289             input_thread_t *p_input;
 290             PL_DEBUG( "dead input" );
 291
 292             p_input = p_playlist->p_input;
 293             p_playlist->p_input = NULL;
 294
 295             /* Release the playlist lock, because we may get stuck
 296              * in vlc_object_release() for some time. */
 297             PL_UNLOCK;
 298
 299             /* Destroy input */
 300             vlc_object_release( p_input );
 301
 302             PL_LOCK;
 303
 304             p_playlist->gc_date = mdate();
 305             p_playlist->b_cant_sleep = VLC_TRUE;
 306
 307             if( p_playlist->status.p_item->i_flags
 308                 & PLAYLIST_REMOVE_FLAG )
 309             {
 310                  PL_DEBUG( "%s was marked for deletion, deleting",
 311                                  PLI_NAME( p_playlist->status.p_item  ) );
 312                  playlist_ItemDelete( p_playlist->status.p_item );
 313                  if( p_playlist->request.p_item == p_playlist->status.p_item )
 314                      p_playlist->request.p_item = NULL;
 315                  p_playlist->status.p_item = NULL;
 316             }
 317
 318             i_activity= var_GetInteger( p_playlist, "activity" );
 319             var_SetInteger( p_playlist, "activity", i_activity -
 320                             DEFAULT_INPUT_ACTIVITY );
 321             goto check_input;
 322         }
 323         /* This input is dying, let it do */
 324         else if( p_playlist->p_input->b_die )
 325         {
 326             PL_DEBUG( "dying input" );
 327             PL_UNLOCK;
 328             msleep( INTF_IDLE_SLEEP );
 329             PL_LOCK;
 330             goto check_input;
 331         }
 332         /* This input has finished, ask it to die ! */
 333         else if( p_playlist->p_input->b_error
 334                   || p_playlist->p_input->b_eof )
 335         {
 336             PL_DEBUG( "finished input" );
 337             input_StopThread( p_playlist->p_input );
 338             /* No need to wait here, we'll wait in the p_input->b_die case */
 339             goto check_input;
 340         }
 341         else if( p_playlist->p_input->i_state != INIT_S )
 342         {
 343             PL_UNLOCK;
 344             ObjectGarbageCollector( p_playlist, VLC_FALSE );
 345             PL_LOCK;
 346         }
 347     }
 348     else
 349     {
 350         /* No input. Several cases
 351          *  - No request, running status -> start new item
 352          *  - No request, stopped status -> collect garbage
 353          *  - Request, running requested -> start new item
 354          *  - Request, stopped requested -> collect garbage
 355         */
 356         if( p_playlist->request.i_status != PLAYLIST_STOPPED )
 357         {
 358             msg_Dbg( p_playlist, "starting new item" );
 359             p_item = playlist_NextItem( p_playlist );
 360
 361             if( p_item == NULL )
 362             {
 363                 msg_Dbg( p_playlist, "nothing to play" );
 364                 p_playlist->status.i_status = PLAYLIST_STOPPED;
 365                 PL_UNLOCK;
 366
 367                 if( b_playexit == VLC_TRUE )
 368                 {
 369                     msg_Info( p_playlist, "end of playlist, exiting" );
 370                     vlc_object_kill( p_playlist->p_libvlc );
 371                 }
 372                 ObjectGarbageCollector( p_playlist, VLC_TRUE );
 373                 return;
 374              }
 375              playlist_PlayItem( p_playlist, p_item );
 376          }
 377          else
 378          {
 379             const vlc_bool_t b_gc_forced = p_playlist->status.i_status != PLAYLIST_STOPPED;
 380
 381             p_playlist->status.i_status = PLAYLIST_STOPPED;
 382             if( p_playlist->status.p_item &&
 383                 p_playlist->status.p_item->i_flags & PLAYLIST_REMOVE_FLAG )
 384             {
 385                 PL_DEBUG( "deleting item marked for deletion" );
 386                 playlist_ItemDelete( p_playlist->status.p_item );
 387                 p_playlist->status.p_item = NULL;
 388             }
 389
 390             /* Collect garbage */
 391             PL_UNLOCK;
 392             ObjectGarbageCollector( p_playlist, b_gc_forced );
 393             PL_LOCK;
 394         }
 395     }
 396     PL_UNLOCK;
 397 }
 398
 399 static void ML_Decref( playlist_item_t *p_node )
 400 {
 401     vlc_gc_decref( p_node->p_input );
 402
 403     int i;
 404     if( p_node->i_children > 0 )
 405         for( i = 0 ; i < p_node->i_children ; i++ )
 406             ML_Decref( p_node->pp_children[i] );
 407 }
 408
 409 /**
 410  * Last loop
 411  *
 412  * The playlist is dying so do the last loop
 413  * \param p_playlist the playlist object
 414  * \return nothing
 415 */
 416 void playlist_LastLoop( playlist_t *p_playlist )
 417 {
 418     vlc_object_t *p_obj;
 419
 420     /* If there is an input, kill it */
 421     while( 1 )
 422     {
 423         PL_LOCK;
 424         if( p_playlist->p_input == NULL )
 425         {
 426             PL_UNLOCK;
 427             break;
 428         }
 429
 430         if( p_playlist->p_input->b_dead )
 431         {
 432             input_thread_t *p_input;
 433
 434             /* Unlink current input */
 435             p_input = p_playlist->p_input;
 436             p_playlist->p_input = NULL;
 437             PL_UNLOCK;
 438
 439             /* Destroy input */
 440             vlc_object_release( p_input );
 441             continue;
 442         }
 443         else if( p_playlist->p_input->b_die )
 444         {
 445             /* This input is dying, leave it alone */
 446             ;
 447         }
 448         else if( p_playlist->p_input->b_error || p_playlist->p_input->b_eof )
 449         {
 450             input_StopThread( p_playlist->p_input );
 451             PL_UNLOCK;
 452             continue;
 453         }
 454         else
 455         {
 456             p_playlist->p_input->b_eof = 1;
 457         }
 458         PL_UNLOCK;
 459
 460         msleep( INTF_IDLE_SLEEP );
 461     }
 462
 463     /* close all remaining sout */
 464     while( ( p_obj = vlc_object_find( p_playlist,
 465                                       VLC_OBJECT_SOUT, FIND_CHILD ) ) )
 466     {
 467         vlc_object_detach( p_obj );
 468         vlc_object_release( p_obj );
 469         sout_DeleteInstance( (sout_instance_t*)p_obj );
 470     }
 471
 472     /* close all remaining vout */
 473     while( ( p_obj = vlc_object_find( p_playlist,
 474                                       VLC_OBJECT_VOUT, FIND_CHILD ) ) )
 475     {
 476         vlc_object_detach( p_obj );
 477         vlc_object_release( p_obj );
 478         vout_Destroy( (vout_thread_t *)p_obj );
 479     }
 480
 481     while( p_playlist->i_sds )
 482     {
 483         playlist_ServicesDiscoveryRemove( p_playlist,
 484                                           p_playlist->pp_sds[0]->p_sd->psz_module );
 485     }
 486
 487     vlc_gc_incref( p_playlist->p_ml_category->p_input );
 488     playlist_MLDump( p_playlist );
 489     /* We don't need the media library anymore */
 490     ML_Decref( p_playlist->p_ml_category );
 491
 492     PL_LOCK;
 493     FOREACH_ARRAY( playlist_item_t *p_del, p_playlist->all_items )
 494         free( p_del->pp_children );
 495         vlc_gc_decref( p_del->p_input );
 496         free( p_del );
 497     FOREACH_END();
 498     ARRAY_RESET( p_playlist->all_items );
 499
 500     ARRAY_RESET( p_playlist->items );
 501     ARRAY_RESET( p_playlist->current );
 502
 503     PL_UNLOCK;
 504 }
 505
 506 /**
 507  * Preparse loop
 508  *
 509  * Main loop for preparser queue
 510  * \param p_obj items to preparse
 511  * \return nothing
 512  */
 513 void playlist_PreparseLoop( playlist_preparse_t *p_obj )
 514 {
 515     playlist_t *p_playlist = (playlist_t *)p_obj->p_parent;
 516     input_item_t *p_current;
 517     int i_activity;
 518     uint32_t i_m, i_o;
 519
 520     while( !p_playlist->b_die )
 521     {
 522         vlc_object_lock( p_obj );
 523         while( p_obj->i_waiting == 0 )
 524         {
 525             if( vlc_object_wait( p_obj ) || p_playlist->b_die )
 526             {
 527                 vlc_object_unlock( p_obj );
 528                 return;
 529             }
 530         }
 531
 532         p_current = p_obj->pp_waiting[0];
 533         REMOVE_ELEM( p_obj->pp_waiting, p_obj->i_waiting, 0 );
 534         vlc_object_unlock( p_obj );
 535
 536         PL_LOCK;
 537         if( p_current )
 538         {
 539             if( p_current->i_type == ITEM_TYPE_FILE )
 540             {
 541                 stats_TimerStart( p_playlist, "Preparse run",
 542                                   STATS_TIMER_PREPARSE );
 543                 /* Do not preparse if it is already done (like by playing it) */
 544                 if( !input_item_IsPreparsed( p_current ) )
 545                 {
 546                     PL_UNLOCK;
 547                     input_Preparse( p_playlist, p_current );
 548                     PL_LOCK;
 549                 }
 550                 stats_TimerStop( p_playlist, STATS_TIMER_PREPARSE );
 551                 PL_UNLOCK;
 552                 input_item_SetPreparsed( p_current, VLC_TRUE );
 553                 var_SetInteger( p_playlist, "item-change", p_current->i_id );
 554                 PL_LOCK;
 555             }
 556             /* If we haven't retrieved enough meta, add to secondary queue
 557              * which will run the "meta fetchers".
 558              * This only checks for meta, not for art
 559              * \todo don't do this for things we won't get meta for, like vids
 560              */
 561             char *psz_arturl = input_item_GetArtURL( p_current );
 562             char *psz_name = input_item_GetName( p_current );
 563             if( !input_MetaSatisfied( p_playlist, p_current, &i_m, &i_o ) )
 564             {
 565                 preparse_item_t p;
 566                 PL_DEBUG( "need to fetch meta for %s", p_current->psz_name );
 567                 p.p_item = p_current;
 568                 p.b_fetch_art = VLC_FALSE;
 569                 vlc_object_lock( p_playlist->p_fetcher );
 570                 INSERT_ELEM( p_playlist->p_fetcher->p_waiting,
 571                              p_playlist->p_fetcher->i_waiting,
 572                              p_playlist->p_fetcher->i_waiting, p);
 573                 vlc_object_signal_unlocked( p_playlist->p_fetcher );
 574                 vlc_object_unlock( p_playlist->p_fetcher );
 575             }
 576             /* We already have all needed meta, but we need art right now */
 577             else if( p_playlist->p_fetcher->i_art_policy == ALBUM_ART_ALL &&
 578                         ( !psz_arturl || strncmp( psz_arturl, "file://", 7 ) ) )
 579             {
 580                 preparse_item_t p;
 581                 PL_DEBUG("meta ok for %s, need to fetch art", psz_name );
 582                 p.p_item = p_current;
 583                 p.b_fetch_art = VLC_TRUE;
 584                 vlc_object_lock( p_playlist->p_fetcher );
 585                 INSERT_ELEM( p_playlist->p_fetcher->p_waiting,
 586                              p_playlist->p_fetcher->i_waiting,
 587                              p_playlist->p_fetcher->i_waiting, p);
 588                 vlc_object_signal_unlocked( p_playlist->p_fetcher );
 589                 vlc_object_unlock( p_playlist->p_fetcher );
 590             }
 591             else
 592             {
 593                 PL_DEBUG( "no fetch required for %s (art currently %s)",
 594                           psz_name, psz_arturl );
 595                 vlc_gc_decref( p_current );
 596             }
 597             free( psz_name );
 598             free( psz_arturl );
 599             PL_UNLOCK;
 600         }
 601         else
 602             PL_UNLOCK;
 603
 604         vlc_object_lock( p_obj );
 605         i_activity = var_GetInteger( p_playlist, "activity" );
 606         if( i_activity < 0 ) i_activity = 0;
 607         vlc_object_unlock( p_obj );
 608         /* Sleep at least 1ms */
 609         msleep( (i_activity+1) * 1000 );
 610     }
 611 }
 612
 613 /**
 614  * Fetcher loop
 615  *
 616  * Main loop for secondary preparser queue
 617  * \param p_obj items to preparse
 618  * \return nothing
 619  */
 620 void playlist_FetcherLoop( playlist_fetcher_t *p_obj )
 621 {
 622     playlist_t *p_playlist = (playlist_t *)p_obj->p_parent;
 623     vlc_bool_t b_fetch_art;
 624     input_item_t *p_item;
 625     int i_activity;
 626
 627     while( !p_playlist->b_die )
 628     {
 629         vlc_mutex_lock( &p_obj->object_lock );
 630         while( p_obj->i_waiting == 0 )
 631         {
 632             vlc_cond_wait( &p_obj->object_wait, &p_obj->object_lock );
 633             if( p_playlist->b_die )
 634             {
 635                 vlc_mutex_unlock( &p_obj->object_lock );
 636                 return;
 637             }
 638         }
 639
 640         b_fetch_art = p_obj->p_waiting->b_fetch_art;
 641         p_item = p_obj->p_waiting->p_item;
 642         REMOVE_ELEM( p_obj->p_waiting, p_obj->i_waiting, 0 );
 643         vlc_mutex_unlock( &p_obj->object_lock );
 644         if( p_item )
 645         {
 646             if( !b_fetch_art )
 647             {
 648                 /* If the user doesn't want us to fetch meta automatically
 649                  * abort here. */
 650                 if( p_playlist->p_fetcher->b_fetch_meta )
 651                 {
 652                     input_MetaFetch( p_playlist, p_item );
 653                     var_SetInteger( p_playlist, "item-change", p_item->i_id );
 654                 }
 655
 656                 /*  Fetch right now */
 657                 if( p_playlist->p_fetcher->i_art_policy == ALBUM_ART_ALL )
 658                 {
 659                     vlc_mutex_lock( &p_obj->object_lock );
 660                     preparse_item_t p;
 661                     p.p_item = p_item;
 662                     p.b_fetch_art = VLC_TRUE;
 663                     INSERT_ELEM( p_playlist->p_fetcher->p_waiting,
 664                                  p_playlist->p_fetcher->i_waiting,
 665                                  0, p );
 666                     PL_DEBUG( "meta fetched for %s, get art", p_item->psz_name );
 667                     vlc_mutex_unlock( &p_obj->object_lock );
 668                     continue;
 669                 }
 670                 else
 671                     vlc_gc_decref( p_item );
 672             }
 673             else
 674             {
 675                 int i_ret;
 676
 677                 /* Check if it is not yet preparsed and if so wait for it (at most 0.5s)
 678                  * (This can happen if we fetch art on play)
 679                  * FIXME this doesn't work if we need to fetch meta before art ... */
 680                 for( i_ret = 0; i_ret < 10 && !input_item_IsPreparsed( p_item ); i_ret++ )
 681                 {
 682                     vlc_bool_t b_break;
 683                     PL_LOCK;
 684                     b_break = ( !p_playlist->p_input || input_GetItem(p_playlist->p_input) != p_item  ||
 685                                 p_playlist->p_input->b_die || p_playlist->p_input->b_eof || p_playlist->p_input->b_error );
 686                     PL_UNLOCK;
 687                     if( b_break )
 688                         break;
 689                     msleep( 50000 );
 690                 }
 691
 692                 i_ret = input_ArtFind( p_playlist, p_item );
 693                 if( i_ret == 1 )
 694                 {
 695                     PL_DEBUG( "downloading art for %s", p_item->psz_name );
 696                     if( input_DownloadAndCacheArt( p_playlist, p_item ) )
 697                         input_item_SetArtNotFound( p_item, VLC_TRUE );
 698                     else {
 699                         input_item_SetArtFetched( p_item, VLC_TRUE );
 700                         var_SetInteger( p_playlist, "item-change",
 701                                         p_item->i_id );
 702                     }
 703                 }
 704                 else if( i_ret == 0 ) /* Was in cache */
 705                 {
 706                     PL_DEBUG( "found art for %s in cache", p_item->psz_name );
 707                     input_item_SetArtFetched( p_item, VLC_TRUE );
 708                     var_SetInteger( p_playlist, "item-change", p_item->i_id );
 709                 }
 710                 else
 711                 {
 712                     PL_DEBUG( "art not found for %s", p_item->psz_name );
 713                     input_item_SetArtNotFound( p_item, VLC_TRUE );
 714                 }
 715                 vlc_gc_decref( p_item );
 716            }
 717         }
 718         vlc_object_lock( p_obj );
 719         i_activity = var_GetInteger( p_playlist, "activity" );
 720         if( i_activity < 0 ) i_activity = 0;
 721         vlc_object_unlock( p_obj );
 722         /* Sleep at least 1ms */
 723         msleep( (i_activity+1) * 1000 );
 724     }
 725 }
 726
 727 static void VariablesInit( playlist_t *p_playlist )
 728 {
 729     vlc_value_t val;
 730     /* These variables control updates */
 731     var_Create( p_playlist, "intf-change", VLC_VAR_BOOL );
 732     val.b_bool = VLC_TRUE;
 733     var_Set( p_playlist, "intf-change", val );
 734
 735     var_Create( p_playlist, "item-change", VLC_VAR_INTEGER );
 736     val.i_int = -1;
 737     var_Set( p_playlist, "item-change", val );
 738
 739     var_Create( p_playlist, "item-deleted", VLC_VAR_INTEGER );
 740     val.i_int = -1;
 741     var_Set( p_playlist, "item-deleted", val );
 742
 743     var_Create( p_playlist, "item-append", VLC_VAR_ADDRESS );
 744
 745     var_Create( p_playlist, "playlist-current", VLC_VAR_INTEGER );
 746     val.i_int = -1;
 747     var_Set( p_playlist, "playlist-current", val );
 748
 749     var_Create( p_playlist, "intf-popupmenu", VLC_VAR_BOOL );
 750
 751     var_Create( p_playlist, "intf-show", VLC_VAR_BOOL );
 752     val.b_bool = VLC_TRUE;
 753     var_Set( p_playlist, "intf-show", val );
 754
 755     var_Create( p_playlist, "activity", VLC_VAR_INTEGER );
 756     var_SetInteger( p_playlist, "activity", 0 );
 757
 758     /* Variables to control playback */
 759     var_CreateGetBool( p_playlist, "play-and-stop" );
 760     var_CreateGetBool( p_playlist, "play-and-exit" );
 761     var_CreateGetBool( p_playlist, "random" );
 762     var_CreateGetBool( p_playlist, "repeat" );
 763     var_CreateGetBool( p_playlist, "loop" );
 764
 765     var_AddCallback( p_playlist, "random", RandomCallback, NULL );
 766 }