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) 1999-2008 the VideoLAN team
   5  *
   6  * Authors: Samuel Hocevar <sam@zoy.org>
   7  *          Clément Stenac <zorglub@videolan.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 #ifdef HAVE_CONFIG_H
  25 # include "config.h"
  26 #endif
  27
  28 #include <stddef.h>
  29 #include <assert.h>
  30 #include <vlc_common.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 = 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     bool b_save;
  65
  66     /* Allocate structure */
  67     p_playlist = vlc_custom_create( p_parent, sizeof( *p_playlist ),
  68                                     VLC_OBJECT_GENERIC, playlist_name );
  69     if( !p_playlist )
  70         return NULL;
  71
  72     TAB_INIT( p_playlist->i_sds, p_playlist->pp_sds );
  73     MALLOC_NULL( p_playlist->p, playlist_private_t );
  74     memset( p_playlist->p, 0, sizeof( playlist_private_t ) );
  75
  76     libvlc_priv(p_parent->p_libvlc)->p_playlist = p_playlist;
  77
  78     VariablesInit( p_playlist );
  79
  80     /* Initialise data structures */
  81     p_playlist->p->p_playlist = p_playlist;
  82     p_playlist->i_last_playlist_id = 0;
  83     p_playlist->p_input = NULL;
  84
  85     p_playlist->gc_date = 0;
  86     p_playlist->b_cant_sleep = false;
  87
  88     ARRAY_INIT( p_playlist->items );
  89     ARRAY_INIT( p_playlist->all_items );
  90     ARRAY_INIT( p_playlist->items_to_delete );
  91     ARRAY_INIT( p_playlist->current );
  92
  93     p_playlist->i_current_index = 0;
  94     p_playlist->b_reset_currently_playing = true;
  95     p_playlist->last_rebuild_date = 0;
  96
  97     p_playlist->b_tree = var_CreateGetBool( p_playlist, "playlist-tree" );
  98
  99     p_playlist->b_doing_ml = false;
 100
 101     p_playlist->b_auto_preparse =
 102                         var_CreateGetBool( p_playlist, "auto-preparse" ) ;
 103
 104     PL_LOCK; /* playlist_NodeCreate will check for it */
 105     p_playlist->p_root_category = playlist_NodeCreate( p_playlist, NULL, NULL,
 106                                     0, NULL );
 107     p_playlist->p_root_onelevel = playlist_NodeCreate( p_playlist, NULL, NULL,
 108                                     0, p_playlist->p_root_category->p_input );
 109     PL_UNLOCK;
 110
 111     if( !p_playlist->p_root_category || !p_playlist->p_root_onelevel )
 112         return NULL;
 113
 114     /* Create playlist and media library */
 115     PL_LOCK; /* playlist_NodesPairCreate will check for it */
 116     playlist_NodesPairCreate( p_playlist, _( "Playlist" ),
 117                             &p_playlist->p_local_category,
 118                             &p_playlist->p_local_onelevel, false );
 119     PL_UNLOCK;
 120
 121     p_playlist->p_local_category->i_flags |= PLAYLIST_RO_FLAG;
 122     p_playlist->p_local_onelevel->i_flags |= PLAYLIST_RO_FLAG;
 123
 124     if( !p_playlist->p_local_category || !p_playlist->p_local_onelevel ||
 125         !p_playlist->p_local_category->p_input ||
 126         !p_playlist->p_local_onelevel->p_input )
 127         return NULL;
 128
 129     if( config_GetInt( p_playlist, "media-library") )
 130     {
 131         PL_LOCK; /* playlist_NodesPairCreate will check for it */
 132         playlist_NodesPairCreate( p_playlist, _( "Media Library" ),
 133                             &p_playlist->p_ml_category,
 134                             &p_playlist->p_ml_onelevel, false );
 135         PL_UNLOCK;
 136
 137         if(!p_playlist->p_ml_category || !p_playlist->p_ml_onelevel)
 138             return NULL;
 139
 140         p_playlist->p_ml_category->i_flags |= PLAYLIST_RO_FLAG;
 141         p_playlist->p_ml_onelevel->i_flags |= PLAYLIST_RO_FLAG;
 142     }
 143     else
 144     {
 145         p_playlist->p_ml_category = p_playlist->p_ml_onelevel = NULL;
 146     }
 147
 148     /* Initial status */
 149     p_playlist->status.p_item = NULL;
 150     p_playlist->status.p_node = p_playlist->p_local_onelevel;
 151     p_playlist->request.b_request = false;
 152     p_playlist->status.i_status = PLAYLIST_STOPPED;
 153
 154     p_playlist->i_sort = SORT_ID;
 155     p_playlist->i_order = ORDER_NORMAL;
 156
 157
 158     b_save = p_playlist->b_auto_preparse;
 159     p_playlist->b_auto_preparse = false;
 160     playlist_MLLoad( p_playlist );
 161     p_playlist->b_auto_preparse = true;
 162
 163     vlc_object_set_destructor( p_playlist, playlist_Destructor );
 164
 165     return p_playlist;
 166 }
 167
 168 /**
 169  * Destroy playlist
 170  *
 171  * Destroy a playlist structure.
 172  * \param p_playlist the playlist object
 173  * \return nothing
 174  */
 175
 176 static void playlist_Destructor( vlc_object_t * p_this )
 177 {
 178     playlist_t * p_playlist = (playlist_t *)p_this;
 179     playlist_preparse_t *p_preparse = &p_playlist->p->preparse;
 180
 181     /* Destroy the item preparser */
 182     if (p_preparse->up)
 183     {
 184         vlc_cancel (p_preparse->thread);
 185         vlc_join (p_preparse->thread, NULL);
 186     }
 187     while (p_preparse->i_waiting > 0)
 188     {   /* Any left-over unparsed item? */
 189         vlc_gc_decref (p_preparse->pp_waiting[0]);
 190         REMOVE_ELEM (p_preparse->pp_waiting, p_preparse->i_waiting, 0);
 191     }
 192     vlc_cond_destroy (&p_preparse->wait);
 193     vlc_mutex_destroy (&p_preparse->lock);
 194
 195     /* Destroy the item meta-infos fetcher */
 196     if( p_playlist->p->p_fetcher )
 197     {
 198         vlc_object_release( p_playlist->p->p_fetcher );
 199     }
 200     msg_Dbg( p_this, "Destroyed" );
 201 }
 202
 203 /* Destroy remaining objects */
 204 static void ObjectGarbageCollector( playlist_t *p_playlist, bool b_force )
 205 {
 206     if( !b_force )
 207     {
 208         if( mdate() - p_playlist->gc_date < 1000000 )
 209         {
 210             p_playlist->b_cant_sleep = true;
 211             return;
 212         }
 213         else if( p_playlist->gc_date == 0 )
 214             return;
 215     }
 216
 217     p_playlist->b_cant_sleep = false;
 218 }
 219
 220 /* Input Callback */
 221 static void input_state_changed( const vlc_event_t * event, void * data )
 222 {
 223     (void)event;
 224     playlist_t * p_playlist = data;
 225     playlist_Signal( p_playlist );
 226 }
 227
 228 /* Input Callback */
 229 static void input_selected_stream_changed( const vlc_event_t * event, void * data )
 230 {
 231     (void)event;
 232     playlist_t * p_playlist = data;
 233     PL_LOCK;
 234     p_playlist->gc_date = mdate();
 235     vlc_object_signal_unlocked( p_playlist );
 236     PL_UNLOCK;
 237 }
 238
 239 /* Internals */
 240 void playlist_release_current_input( playlist_t * p_playlist )
 241 {
 242     PL_ASSERT_LOCKED;
 243
 244     if( !p_playlist->p_input ) return;
 245
 246     input_thread_t * p_input = p_playlist->p_input;
 247     vlc_event_manager_t * p_em = input_get_event_manager( p_input );
 248
 249     vlc_event_detach( p_em, vlc_InputStateChanged,
 250                       input_state_changed, p_playlist );
 251     vlc_event_detach( p_em, vlc_InputSelectedStreamChanged,
 252                       input_selected_stream_changed, p_playlist );
 253     p_playlist->p_input = NULL;
 254
 255     /* Release the playlist lock, because we may get stuck
 256      * in vlc_object_release() for some time. */
 257     PL_UNLOCK;
 258     vlc_thread_join( p_input );
 259     vlc_object_release( p_input );
 260     PL_LOCK;
 261 }
 262
 263 void playlist_set_current_input(
 264     playlist_t * p_playlist, input_thread_t * p_input )
 265 {
 266     PL_ASSERT_LOCKED;
 267
 268     playlist_release_current_input( p_playlist );
 269
 270     if( p_input )
 271     {
 272         vlc_object_yield( p_input );
 273         p_playlist->p_input = p_input;
 274         vlc_event_manager_t * p_em = input_get_event_manager( p_input );
 275         vlc_event_attach( p_em, vlc_InputStateChanged,
 276                           input_state_changed, p_playlist );
 277         vlc_event_attach( p_em, vlc_InputSelectedStreamChanged,
 278                           input_selected_stream_changed, p_playlist );
 279     }
 280 }
 281
 282 /** Get current playing input.
 283  */
 284 input_thread_t * playlist_CurrentInput( playlist_t * p_playlist )
 285 {
 286     input_thread_t * p_input;
 287     PL_LOCK;
 288     p_input = p_playlist->p_input;
 289     if( p_input ) vlc_object_yield( p_input );
 290     PL_UNLOCK;
 291     return p_input;
 292 }
 293
 294 /**
 295  * @}
 296  */
 297
 298 /** Accessor for status item and status nodes.
 299  */
 300 playlist_item_t * get_current_status_item( playlist_t * p_playlist )
 301 {
 302     PL_ASSERT_LOCKED;
 303
 304     return p_playlist->status.p_item;
 305 }
 306
 307 playlist_item_t * get_current_status_node( playlist_t * p_playlist )
 308 {
 309     PL_ASSERT_LOCKED;
 310
 311     return p_playlist->status.p_node;
 312 }
 313
 314 void set_current_status_item( playlist_t * p_playlist,
 315     playlist_item_t * p_item )
 316 {
 317     PL_ASSERT_LOCKED;
 318
 319     if( p_playlist->status.p_item &&
 320         p_playlist->status.p_item->i_flags & PLAYLIST_REMOVE_FLAG &&
 321         p_playlist->status.p_item != p_item )
 322     {
 323         /* It's unsafe given current design to delete a playlist item :(
 324         playlist_ItemDelete( p_playlist->status.p_item ); */
 325     }
 326     p_playlist->status.p_item = p_item;
 327 }
 328
 329 void set_current_status_node( playlist_t * p_playlist,
 330     playlist_item_t * p_node )
 331 {
 332     PL_ASSERT_LOCKED;
 333
 334     if( p_playlist->status.p_node &&
 335         p_playlist->status.p_node->i_flags & PLAYLIST_REMOVE_FLAG &&
 336         p_playlist->status.p_node != p_node )
 337     {
 338         /* It's unsafe given current design to delete a playlist item :(
 339         playlist_ItemDelete( p_playlist->status.p_node ); */
 340     }
 341     p_playlist->status.p_node = p_node;
 342 }
 343
 344 /**
 345  * Main loop
 346  *
 347  * Main loop for the playlist. It should be entered with the
 348  * playlist lock (otherwise input event may be lost)
 349  * \param p_playlist the playlist object
 350  * \return nothing
 351  */
 352 void playlist_MainLoop( playlist_t *p_playlist )
 353 {
 354     playlist_item_t *p_item = NULL;
 355     bool b_playexit = var_GetBool( p_playlist, "play-and-exit" );
 356
 357     PL_ASSERT_LOCKED;
 358
 359     if( p_playlist->b_reset_currently_playing &&
 360         mdate() - p_playlist->last_rebuild_date > 30000 ) // 30 ms
 361     {
 362         ResetCurrentlyPlaying( p_playlist, var_GetBool( p_playlist, "random" ),
 363                                get_current_status_item( p_playlist ) );
 364         p_playlist->last_rebuild_date = mdate();
 365     }
 366
 367 check_input:
 368     /* If there is an input, check that it doesn't need to die. */
 369     if( p_playlist->p_input )
 370     {
 371         if( p_playlist->request.b_request && !p_playlist->p_input->b_die )
 372         {
 373             PL_DEBUG( "incoming request - stopping current input" );
 374             input_StopThread( p_playlist->p_input );
 375         }
 376
 377         /* This input is dead. Remove it ! */
 378         if( p_playlist->p_input->b_dead )
 379         {
 380             int i_activity;
 381             input_thread_t *p_input;
 382             sout_instance_t **pp_sout = &p_playlist->p->p_sout;
 383
 384             PL_DEBUG( "dead input" );
 385
 386             p_input = p_playlist->p_input;
 387
 388             assert( *pp_sout == NULL );
 389             if( var_CreateGetBool( p_input, "sout-keep" ) )
 390                 *pp_sout = input_DetachSout( p_input );
 391
 392             /* Destroy input */
 393             playlist_release_current_input( p_playlist );
 394
 395             p_playlist->gc_date = mdate();
 396             p_playlist->b_cant_sleep = true;
 397
 398             i_activity= var_GetInteger( p_playlist, "activity" );
 399             var_SetInteger( p_playlist, "activity", i_activity -
 400                             DEFAULT_INPUT_ACTIVITY );
 401
 402             goto check_input;
 403         }
 404         /* This input is dying, let it do */
 405         else if( p_playlist->p_input->b_die )
 406         {
 407             PL_DEBUG( "dying input" );
 408             PL_UNLOCK;
 409             msleep( INTF_IDLE_SLEEP );
 410             PL_LOCK;
 411             goto check_input;
 412         }
 413         /* This input has finished, ask it to die ! */
 414         else if( p_playlist->p_input->b_error
 415                   || p_playlist->p_input->b_eof )
 416         {
 417             PL_DEBUG( "finished input" );
 418             input_StopThread( p_playlist->p_input );
 419             /* No need to wait here, we'll wait in the p_input->b_die case */
 420             goto check_input;
 421         }
 422         else if( p_playlist->p_input->i_state != INIT_S )
 423         {
 424             ObjectGarbageCollector( p_playlist, false );
 425         }
 426     }
 427     else
 428     {
 429         /* No input. Several cases
 430          *  - No request, running status -> start new item
 431          *  - No request, stopped status -> collect garbage
 432          *  - Request, running requested -> start new item
 433          *  - Request, stopped requested -> collect garbage
 434         */
 435         int i_status = p_playlist->request.b_request ?
 436             p_playlist->request.i_status : p_playlist->status.i_status;
 437         if( i_status != PLAYLIST_STOPPED )
 438         {
 439             msg_Dbg( p_playlist, "starting new item" );
 440             p_item = playlist_NextItem( p_playlist );
 441
 442             if( p_item == NULL )
 443             {
 444                 msg_Dbg( p_playlist, "nothing to play" );
 445                 p_playlist->status.i_status = PLAYLIST_STOPPED;
 446
 447                 if( b_playexit == true )
 448                 {
 449                     msg_Info( p_playlist, "end of playlist, exiting" );
 450                     vlc_object_kill( p_playlist->p_libvlc );
 451                 }
 452                 ObjectGarbageCollector( p_playlist, true );
 453                 return;
 454             }
 455             playlist_PlayItem( p_playlist, p_item );
 456             /* playlist_PlayItem loose input event, we need to recheck */
 457             goto check_input;
 458         }
 459         else
 460         {
 461             const bool b_gc_forced = p_playlist->status.i_status != PLAYLIST_STOPPED;
 462
 463             p_playlist->status.i_status = PLAYLIST_STOPPED;
 464
 465             /* Collect garbage */
 466             ObjectGarbageCollector( p_playlist, b_gc_forced );
 467         }
 468     }
 469 }
 470
 471 /**
 472  * Last loop
 473  *
 474  * The playlist is dying so do the last loop
 475  * \param p_playlist the playlist object
 476  * \return nothing
 477 */
 478 void playlist_LastLoop( playlist_t *p_playlist )
 479 {
 480     /* If there is an input, kill it */
 481     while( 1 )
 482     {
 483         PL_LOCK;
 484         if( p_playlist->p_input == NULL )
 485         {
 486             PL_UNLOCK;
 487             break;
 488         }
 489
 490         if( p_playlist->p_input->b_dead )
 491         {
 492             /* remove input */
 493             playlist_release_current_input( p_playlist );
 494
 495             /* sout-keep: no need to anything here.
 496              * The last input will destroy its sout, if any, by itself */
 497
 498             PL_UNLOCK;
 499             continue;
 500         }
 501         else if( p_playlist->p_input->b_die )
 502         {
 503             /* This input is dying, leave it alone */
 504             ;
 505         }
 506         else if( p_playlist->p_input->b_error || p_playlist->p_input->b_eof )
 507         {
 508             input_StopThread( p_playlist->p_input );
 509             PL_UNLOCK;
 510             continue;
 511         }
 512         else
 513         {
 514             p_playlist->p_input->b_eof = 1;
 515         }
 516         PL_UNLOCK;
 517
 518         msleep( INTF_IDLE_SLEEP );
 519     }
 520
 521 #ifdef ENABLE_SOUT
 522     /* close the remaining sout-keep (if there was no input atm) */
 523     sout_instance_t *p_sout = p_playlist->p->p_sout;
 524     if (p_sout)
 525         sout_DeleteInstance( p_sout );
 526 #endif
 527
 528     /* Core should have terminated all SDs before the playlist */
 529     /* TODO: It fails to do so when not playing anything -- Courmisch */
 530     playlist_ServicesDiscoveryKillAll( p_playlist );
 531     playlist_MLDump( p_playlist );
 532
 533     vlc_object_kill( p_playlist->p->p_fetcher );
 534     vlc_thread_join( p_playlist->p->p_fetcher );
 535
 536     PL_LOCK;
 537
 538     /* Release the current node */
 539     set_current_status_node( p_playlist, NULL );
 540
 541     /* Release the current item */
 542     set_current_status_item( p_playlist, NULL );
 543
 544     FOREACH_ARRAY( playlist_item_t *p_del, p_playlist->all_items )
 545         free( p_del->pp_children );
 546         vlc_gc_decref( p_del->p_input );
 547         free( p_del );
 548     FOREACH_END();
 549     ARRAY_RESET( p_playlist->all_items );
 550     FOREACH_ARRAY( playlist_item_t *p_del, p_playlist->items_to_delete )
 551         free( p_del->pp_children );
 552         vlc_gc_decref( p_del->p_input );
 553         free( p_del );
 554     FOREACH_END();
 555     ARRAY_RESET( p_playlist->items_to_delete );
 556
 557     ARRAY_RESET( p_playlist->items );
 558     ARRAY_RESET( p_playlist->current );
 559
 560     PL_UNLOCK;
 561 }
 562
 563 /**
 564  * Preparse queue loop
 565  *
 566  * @param p_obj preparse structure
 567  * @return never
 568  */
 569 void *playlist_PreparseLoop( void *data )
 570 {
 571     playlist_preparse_t *p_preparse = data;
 572     playlist_t *p_playlist =  ((playlist_private_t *)(((char *)p_preparse)
 573              - offsetof(playlist_private_t, preparse)))->p_playlist;
 574     int i_activity;
 575
 576     for( ;; )
 577     {
 578         input_item_t *p_current;
 579
 580         vlc_mutex_lock( &p_preparse->lock );
 581         mutex_cleanup_push( &p_preparse->lock );
 582
 583         while( p_preparse->i_waiting == 0 )
 584             vlc_cond_wait( &p_preparse->wait, &p_preparse->lock );
 585
 586         p_current = p_preparse->pp_waiting[0];
 587         REMOVE_ELEM( p_preparse->pp_waiting, p_preparse->i_waiting, 0 );
 588         vlc_cleanup_run( );
 589
 590         if( p_current )
 591         {
 592             int canc = vlc_savecancel ();
 593             PL_LOCK;
 594             if( p_current->i_type == ITEM_TYPE_FILE )
 595             {
 596                 stats_TimerStart( p_playlist, "Preparse run",
 597                                   STATS_TIMER_PREPARSE );
 598                 /* Do not preparse if it is already done (like by playing it) */
 599                 if( !input_item_IsPreparsed( p_current ) )
 600                 {
 601                     PL_UNLOCK;
 602                     input_Preparse( p_playlist, p_current );
 603                     PL_LOCK;
 604                 }
 605                 stats_TimerStop( p_playlist, STATS_TIMER_PREPARSE );
 606                 PL_UNLOCK;
 607                 input_item_SetPreparsed( p_current, true );
 608                 var_SetInteger( p_playlist, "item-change", p_current->i_id );
 609                 PL_LOCK;
 610             }
 611             /* If we haven't retrieved enough meta, add to secondary queue
 612              * which will run the "meta fetchers".
 613              * This only checks for meta, not for art
 614              * \todo don't do this for things we won't get meta for, like vids
 615              */
 616             char *psz_arturl = input_item_GetArtURL( p_current );
 617             char *psz_name = input_item_GetName( p_current );
 618             if( p_playlist->p->p_fetcher->i_art_policy == ALBUM_ART_ALL &&
 619                         ( !psz_arturl || strncmp( psz_arturl, "file://", 7 ) ) )
 620             {
 621                 PL_DEBUG("meta ok for %s, need to fetch art", psz_name );
 622                 vlc_object_lock( p_playlist->p->p_fetcher );
 623                 if( vlc_object_alive( p_playlist->p->p_fetcher ) )
 624                 {
 625                     INSERT_ELEM( p_playlist->p->p_fetcher->pp_waiting,
 626                         p_playlist->p->p_fetcher->i_waiting,
 627                         p_playlist->p->p_fetcher->i_waiting, p_current);
 628                     vlc_object_signal_unlocked( p_playlist->p->p_fetcher );
 629                 }
 630                 else
 631                     vlc_gc_decref( p_current );
 632                 vlc_object_unlock( p_playlist->p->p_fetcher );
 633             }
 634             else
 635             {
 636                 PL_DEBUG( "no fetch required for %s (art currently %s)",
 637                           psz_name, psz_arturl );
 638                 vlc_gc_decref( p_current );
 639             }
 640             free( psz_name );
 641             free( psz_arturl );
 642             PL_UNLOCK;
 643             vlc_restorecancel( canc );
 644         }
 645
 646         i_activity = var_GetInteger( p_playlist, "activity" );
 647         if( i_activity < 0 ) i_activity = 0;
 648         /* Sleep at least 1ms */
 649         msleep( (i_activity+1) * 1000 );
 650     }
 651
 652     assert( 0 );
 653     return NULL;
 654 }
 655
 656 /**
 657  * Fetcher loop
 658  *
 659  * Main loop for secondary preparser queue
 660  * \param p_obj items to preparse
 661  * \return nothing
 662  */
 663 void playlist_FetcherLoop( playlist_fetcher_t *p_obj )
 664 {
 665     playlist_t *p_playlist = (playlist_t *)p_obj->p_parent;
 666     input_item_t *p_item;
 667     int i_activity;
 668
 669     vlc_object_lock( p_obj );
 670
 671     while( vlc_object_alive( p_obj ) )
 672     {
 673         if( p_obj->i_waiting == 0 )
 674         {
 675             vlc_object_wait( p_obj );
 676             continue;
 677         }
 678
 679         p_item = p_obj->pp_waiting[0];
 680         REMOVE_ELEM( p_obj->pp_waiting, p_obj->i_waiting, 0 );
 681         vlc_object_unlock( p_obj );
 682         if( p_item )
 683         {
 684             int i_ret;
 685
 686             /* Check if it is not yet preparsed and if so wait for it (at most 0.5s)
 687              * (This can happen if we fetch art on play)
 688              * FIXME this doesn't work if we need to fetch meta before art ... */
 689             for( i_ret = 0; i_ret < 10 && !input_item_IsPreparsed( p_item ); i_ret++ )
 690             {
 691                 bool b_break;
 692                 PL_LOCK;
 693                 b_break = ( !p_playlist->p_input || input_GetItem(p_playlist->p_input) != p_item  ||
 694                             p_playlist->p_input->b_die || p_playlist->p_input->b_eof || p_playlist->p_input->b_error );
 695                 PL_UNLOCK;
 696                 if( b_break )
 697                     break;
 698                 msleep( 50000 );
 699             }
 700
 701             i_ret = input_ArtFind( p_playlist, p_item );
 702             if( i_ret == 1 )
 703             {
 704                 PL_DEBUG( "downloading art for %s", p_item->psz_name );
 705                 if( input_DownloadAndCacheArt( p_playlist, p_item ) )
 706                     input_item_SetArtNotFound( p_item, true );
 707                 else {
 708                     input_item_SetArtFetched( p_item, true );
 709                     var_SetInteger( p_playlist, "item-change",
 710                                     p_item->i_id );
 711                 }
 712             }
 713             else if( i_ret == 0 ) /* Was in cache */
 714             {
 715                 PL_DEBUG( "found art for %s in cache", p_item->psz_name );
 716                 input_item_SetArtFetched( p_item, true );
 717                 var_SetInteger( p_playlist, "item-change", p_item->i_id );
 718             }
 719             else
 720             {
 721                 PL_DEBUG( "art not found for %s", p_item->psz_name );
 722                 input_item_SetArtNotFound( p_item, true );
 723             }
 724             vlc_gc_decref( p_item );
 725         }
 726         vlc_object_lock( p_obj );
 727         i_activity = var_GetInteger( p_playlist, "activity" );
 728         if( i_activity < 0 ) i_activity = 0;
 729         vlc_object_unlock( p_obj );
 730         /* Sleep at least 1ms */
 731         msleep( (i_activity+1) * 1000 );
 732         vlc_object_lock( p_obj );
 733     }
 734
 735     while( p_obj->i_waiting > 0 )
 736     {
 737         vlc_gc_decref( p_obj->pp_waiting[0] );
 738         REMOVE_ELEM( p_obj->pp_waiting, p_obj->i_waiting, 0 );
 739     }
 740
 741     vlc_object_unlock( p_obj );
 742 }
 743
 744 static void VariablesInit( playlist_t *p_playlist )
 745 {
 746     vlc_value_t val;
 747     /* These variables control updates */
 748     var_Create( p_playlist, "intf-change", VLC_VAR_BOOL );
 749     val.b_bool = true;
 750     var_Set( p_playlist, "intf-change", val );
 751
 752     var_Create( p_playlist, "item-change", VLC_VAR_INTEGER );
 753     val.i_int = -1;
 754     var_Set( p_playlist, "item-change", val );
 755
 756     var_Create( p_playlist, "item-deleted", VLC_VAR_INTEGER );
 757     val.i_int = -1;
 758     var_Set( p_playlist, "item-deleted", val );
 759
 760     var_Create( p_playlist, "item-append", VLC_VAR_ADDRESS );
 761
 762     var_Create( p_playlist, "playlist-current", VLC_VAR_INTEGER );
 763     val.i_int = -1;
 764     var_Set( p_playlist, "playlist-current", val );
 765
 766     var_Create( p_playlist, "activity", VLC_VAR_INTEGER );
 767     var_SetInteger( p_playlist, "activity", 0 );
 768
 769     /* Variables to control playback */
 770     var_CreateGetBool( p_playlist, "play-and-stop" );
 771     var_CreateGetBool( p_playlist, "play-and-exit" );
 772     var_CreateGetBool( p_playlist, "random" );
 773     var_CreateGetBool( p_playlist, "repeat" );
 774     var_CreateGetBool( p_playlist, "loop" );
 775
 776     var_AddCallback( p_playlist, "random", RandomCallback, NULL );
 777 }