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 <assert.h>
  29 #include <vlc_common.h>
  30 #include <vlc_sout.h>
  31 #include <vlc_playlist.h>
  32 #include <vlc_interface.h>
  33 #include "playlist_internal.h"
  34 #include "stream_output/stream_output.h" /* sout_DeleteInstance */
  35
  36 /*****************************************************************************
  37  * Local prototypes
  38  *****************************************************************************/
  39 static void VariablesInit( playlist_t *p_playlist );
  40 static void playlist_Destructor( vlc_object_t * p_this );
  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
  74     libvlc_priv(p_parent->p_libvlc)->p_playlist = p_playlist;
  75
  76     VariablesInit( p_playlist );
  77
  78     /* Initialise data structures */
  79     p_playlist->i_last_playlist_id = 0;
  80     p_playlist->p_input = NULL;
  81
  82     p_playlist->gc_date = 0;
  83     p_playlist->b_cant_sleep = false;
  84
  85     ARRAY_INIT( p_playlist->items );
  86     ARRAY_INIT( p_playlist->all_items );
  87     ARRAY_INIT( p_playlist->items_to_delete );
  88     ARRAY_INIT( p_playlist->current );
  89
  90     p_playlist->i_current_index = 0;
  91     p_playlist->b_reset_currently_playing = true;
  92     p_playlist->last_rebuild_date = 0;
  93
  94     p_playlist->b_tree = var_CreateGetBool( p_playlist, "playlist-tree" );
  95
  96     p_playlist->b_doing_ml = false;
  97
  98     p_playlist->b_auto_preparse =
  99                         var_CreateGetBool( p_playlist, "auto-preparse" ) ;
 100
 101     p_playlist->p_root_category = playlist_NodeCreate( p_playlist, NULL, NULL,
 102                                     0, NULL );
 103     p_playlist->p_root_onelevel = playlist_NodeCreate( p_playlist, NULL, NULL,
 104                                     0, p_playlist->p_root_category->p_input );
 105
 106     if( !p_playlist->p_root_category || !p_playlist->p_root_onelevel )
 107         return NULL;
 108
 109     /* Create playlist and media library */
 110     PL_LOCK; /* playlist_NodesPairCreate will check for it */
 111     playlist_NodesPairCreate( p_playlist, _( "Playlist" ),
 112                             &p_playlist->p_local_category,
 113                             &p_playlist->p_local_onelevel, false );
 114     PL_UNLOCK;
 115
 116     p_playlist->p_local_category->i_flags |= PLAYLIST_RO_FLAG;
 117     p_playlist->p_local_onelevel->i_flags |= PLAYLIST_RO_FLAG;
 118
 119     if( !p_playlist->p_local_category || !p_playlist->p_local_onelevel ||
 120         !p_playlist->p_local_category->p_input ||
 121         !p_playlist->p_local_onelevel->p_input )
 122         return NULL;
 123
 124     if( config_GetInt( p_playlist, "media-library") )
 125     {
 126         PL_LOCK; /* playlist_NodesPairCreate will check for it */
 127         playlist_NodesPairCreate( p_playlist, _( "Media Library" ),
 128                             &p_playlist->p_ml_category,
 129                             &p_playlist->p_ml_onelevel, false );
 130         PL_UNLOCK;
 131
 132         if(!p_playlist->p_ml_category || !p_playlist->p_ml_onelevel)
 133             return NULL;
 134
 135         p_playlist->p_ml_category->i_flags |= PLAYLIST_RO_FLAG;
 136         p_playlist->p_ml_onelevel->i_flags |= PLAYLIST_RO_FLAG;
 137     }
 138     else
 139     {
 140         p_playlist->p_ml_category = p_playlist->p_ml_onelevel = NULL;
 141     }
 142
 143     /* Initial status */
 144     p_playlist->status.p_item = NULL;
 145     p_playlist->status.p_node = p_playlist->p_local_onelevel;
 146     p_playlist->request.b_request = false;
 147     p_playlist->status.i_status = PLAYLIST_STOPPED;
 148
 149     p_playlist->i_sort = SORT_ID;
 150     p_playlist->i_order = ORDER_NORMAL;
 151
 152
 153     b_save = p_playlist->b_auto_preparse;
 154     p_playlist->b_auto_preparse = false;
 155     playlist_MLLoad( p_playlist );
 156     p_playlist->b_auto_preparse = true;
 157
 158     vlc_object_set_destructor( p_playlist, playlist_Destructor );
 159
 160     return p_playlist;
 161 }
 162
 163 /**
 164  * Destroy playlist
 165  *
 166  * Destroy a playlist structure.
 167  * \param p_playlist the playlist object
 168  * \return nothing
 169  */
 170
 171 static void playlist_Destructor( vlc_object_t * p_this )
 172 {
 173     playlist_t * p_playlist = (playlist_t *)p_this;
 174
 175     if( p_playlist->p_preparse )
 176     {
 177         vlc_object_release( p_playlist->p_preparse );
 178     }
 179
 180     if( p_playlist->p_fetcher )
 181     {
 182         vlc_object_release( p_playlist->p_fetcher );
 183     }
 184     msg_Dbg( p_this, "Destroyed" );
 185 }
 186
 187 /* Destroy remaining objects */
 188 static void ObjectGarbageCollector( playlist_t *p_playlist, bool b_force )
 189 {
 190     if( !b_force )
 191     {
 192         if( mdate() - p_playlist->gc_date < 1000000 )
 193         {
 194             p_playlist->b_cant_sleep = true;
 195             return;
 196         }
 197         else if( p_playlist->gc_date == 0 )
 198             return;
 199     }
 200
 201     p_playlist->b_cant_sleep = false;
 202 }
 203
 204 /* Input Callback */
 205 static void input_state_changed( const vlc_event_t * event, void * data )
 206 {
 207     (void)event;
 208     playlist_t * p_playlist = data;
 209     playlist_Signal( p_playlist );
 210 }
 211
 212 /* Input Callback */
 213 static void input_selected_stream_changed( const vlc_event_t * event, void * data )
 214 {
 215     (void)event;
 216     playlist_t * p_playlist = data;
 217     PL_LOCK;
 218     p_playlist->gc_date = mdate();
 219     vlc_object_signal_unlocked( p_playlist );
 220     PL_UNLOCK;
 221 }
 222
 223 /* Internals */
 224 void playlist_release_current_input( playlist_t * p_playlist )
 225 {
 226     PL_ASSERT_LOCKED;
 227
 228     if( !p_playlist->p_input ) return;
 229
 230     input_thread_t * p_input = p_playlist->p_input;
 231     vlc_event_manager_t * p_em = input_get_event_manager( p_input );
 232
 233     vlc_event_detach( p_em, vlc_InputStateChanged,
 234                       input_state_changed, p_playlist );
 235     vlc_event_detach( p_em, vlc_InputSelectedStreamChanged,
 236                       input_selected_stream_changed, p_playlist );
 237     p_playlist->p_input = NULL;
 238
 239     /* Release the playlist lock, because we may get stuck
 240      * in vlc_object_release() for some time. */
 241     PL_UNLOCK;
 242     vlc_object_release( p_input );
 243     PL_LOCK;
 244 }
 245
 246 void playlist_set_current_input(
 247     playlist_t * p_playlist, input_thread_t * p_input )
 248 {
 249     PL_ASSERT_LOCKED;
 250
 251     playlist_release_current_input( p_playlist );
 252
 253     if( p_input )
 254     {
 255         vlc_object_yield( p_input );
 256         p_playlist->p_input = p_input;
 257         vlc_event_manager_t * p_em = input_get_event_manager( p_input );
 258         vlc_event_attach( p_em, vlc_InputStateChanged,
 259                           input_state_changed, p_playlist );
 260         vlc_event_attach( p_em, vlc_InputSelectedStreamChanged,
 261                           input_selected_stream_changed, p_playlist );
 262     }
 263 }
 264
 265 /** Get current playing input.
 266  */
 267 input_thread_t * playlist_CurrentInput( playlist_t * p_playlist )
 268 {
 269     input_thread_t * p_input;
 270     PL_LOCK;
 271     p_input = p_playlist->p_input;
 272     if( p_input ) vlc_object_yield( p_input );
 273     PL_UNLOCK;
 274     return p_input;
 275 }
 276
 277 /**
 278  * @}
 279  */
 280
 281 /** Accessor for status item and status nodes.
 282  */
 283 playlist_item_t * get_current_status_item( playlist_t * p_playlist )
 284 {
 285     PL_ASSERT_LOCKED;
 286
 287     return p_playlist->status.p_item;
 288 }
 289
 290 playlist_item_t * get_current_status_node( playlist_t * p_playlist )
 291 {
 292     PL_ASSERT_LOCKED;
 293
 294     return p_playlist->status.p_node;
 295 }
 296
 297 void set_current_status_item( playlist_t * p_playlist,
 298     playlist_item_t * p_item )
 299 {
 300     PL_ASSERT_LOCKED;
 301
 302     if( p_playlist->status.p_item &&
 303         p_playlist->status.p_item->i_flags & PLAYLIST_REMOVE_FLAG &&
 304         p_playlist->status.p_item != p_item )
 305     {
 306         /* It's unsafe given current design to delete a playlist item :(
 307         playlist_ItemDelete( p_playlist->status.p_item ); */
 308     }
 309     p_playlist->status.p_item = p_item;
 310 }
 311
 312 void set_current_status_node( playlist_t * p_playlist,
 313     playlist_item_t * p_node )
 314 {
 315     PL_ASSERT_LOCKED;
 316
 317     if( p_playlist->status.p_node &&
 318         p_playlist->status.p_node->i_flags & PLAYLIST_REMOVE_FLAG &&
 319         p_playlist->status.p_node != p_node )
 320     {
 321         /* It's unsafe given current design to delete a playlist item :(
 322         playlist_ItemDelete( p_playlist->status.p_node ); */
 323     }
 324     p_playlist->status.p_node = p_node;
 325 }
 326
 327 /**
 328  * Main loop
 329  *
 330  * Main loop for the playlist. It should be entered with the
 331  * playlist lock (otherwise input event may be lost)
 332  * \param p_playlist the playlist object
 333  * \return nothing
 334  */
 335 void playlist_MainLoop( playlist_t *p_playlist )
 336 {
 337     playlist_item_t *p_item = NULL;
 338     bool b_playexit = var_GetBool( p_playlist, "play-and-exit" );
 339
 340     PL_ASSERT_LOCKED;
 341
 342     if( p_playlist->b_reset_currently_playing &&
 343         mdate() - p_playlist->last_rebuild_date > 30000 ) // 30 ms
 344     {
 345         ResetCurrentlyPlaying( p_playlist, var_GetBool( p_playlist, "random" ),
 346                                get_current_status_item( p_playlist ) );
 347         p_playlist->last_rebuild_date = mdate();
 348     }
 349
 350 check_input:
 351     /* If there is an input, check that it doesn't need to die. */
 352     if( p_playlist->p_input )
 353     {
 354         if( p_playlist->request.b_request && !p_playlist->p_input->b_die )
 355         {
 356             PL_DEBUG( "incoming request - stopping current input" );
 357             input_StopThread( p_playlist->p_input );
 358         }
 359
 360         /* This input is dead. Remove it ! */
 361         if( p_playlist->p_input->b_dead )
 362         {
 363             int i_activity;
 364             input_thread_t *p_input;
 365             sout_instance_t **pp_sout =
 366                 &libvlc_priv(p_playlist->p_libvlc)->p_sout;
 367
 368             PL_DEBUG( "dead input" );
 369
 370             p_input = p_playlist->p_input;
 371
 372             assert( *pp_sout == NULL );
 373             if( var_CreateGetBool( p_input, "sout-keep" ) )
 374                 *pp_sout = input_DetachSout( p_input );
 375
 376             /* Destroy input */
 377             playlist_release_current_input( p_playlist );
 378
 379             p_playlist->gc_date = mdate();
 380             p_playlist->b_cant_sleep = true;
 381
 382             i_activity= var_GetInteger( p_playlist, "activity" );
 383             var_SetInteger( p_playlist, "activity", i_activity -
 384                             DEFAULT_INPUT_ACTIVITY );
 385
 386             goto check_input;
 387         }
 388         /* This input is dying, let it do */
 389         else if( p_playlist->p_input->b_die )
 390         {
 391             PL_DEBUG( "dying input" );
 392             PL_UNLOCK;
 393             msleep( INTF_IDLE_SLEEP );
 394             PL_LOCK;
 395             goto check_input;
 396         }
 397         /* This input has finished, ask it to die ! */
 398         else if( p_playlist->p_input->b_error
 399                   || p_playlist->p_input->b_eof )
 400         {
 401             PL_DEBUG( "finished input" );
 402             input_StopThread( p_playlist->p_input );
 403             /* No need to wait here, we'll wait in the p_input->b_die case */
 404             goto check_input;
 405         }
 406         else if( p_playlist->p_input->i_state != INIT_S )
 407         {
 408             ObjectGarbageCollector( p_playlist, false );
 409         }
 410     }
 411     else
 412     {
 413         /* No input. Several cases
 414          *  - No request, running status -> start new item
 415          *  - No request, stopped status -> collect garbage
 416          *  - Request, running requested -> start new item
 417          *  - Request, stopped requested -> collect garbage
 418         */
 419         int i_status = p_playlist->request.b_request ?
 420             p_playlist->request.i_status : p_playlist->status.i_status;
 421         if( i_status != PLAYLIST_STOPPED )
 422         {
 423             msg_Dbg( p_playlist, "starting new item" );
 424             p_item = playlist_NextItem( p_playlist );
 425
 426             if( p_item == NULL )
 427             {
 428                 msg_Dbg( p_playlist, "nothing to play" );
 429                 p_playlist->status.i_status = PLAYLIST_STOPPED;
 430
 431                 if( b_playexit == true )
 432                 {
 433                     msg_Info( p_playlist, "end of playlist, exiting" );
 434                     vlc_object_kill( p_playlist->p_libvlc );
 435                 }
 436                 ObjectGarbageCollector( p_playlist, true );
 437                 return;
 438             }
 439             playlist_PlayItem( p_playlist, p_item );
 440             /* playlist_PlayItem loose input event, we need to recheck */
 441             goto check_input;
 442         }
 443         else
 444         {
 445             const bool b_gc_forced = p_playlist->status.i_status != PLAYLIST_STOPPED;
 446
 447             p_playlist->status.i_status = PLAYLIST_STOPPED;
 448
 449             /* Collect garbage */
 450             ObjectGarbageCollector( p_playlist, b_gc_forced );
 451         }
 452     }
 453 }
 454
 455 /**
 456  * Last loop
 457  *
 458  * The playlist is dying so do the last loop
 459  * \param p_playlist the playlist object
 460  * \return nothing
 461 */
 462 void playlist_LastLoop( playlist_t *p_playlist )
 463 {
 464     /* If there is an input, kill it */
 465     while( 1 )
 466     {
 467         PL_LOCK;
 468         if( p_playlist->p_input == NULL )
 469         {
 470             PL_UNLOCK;
 471             break;
 472         }
 473
 474         if( p_playlist->p_input->b_dead )
 475         {
 476             /* remove input */
 477             playlist_release_current_input( p_playlist );
 478
 479             /* sout-keep: no need to anything here.
 480              * The last input will destroy its sout, if any, by itself */
 481
 482             PL_UNLOCK;
 483             continue;
 484         }
 485         else if( p_playlist->p_input->b_die )
 486         {
 487             /* This input is dying, leave it alone */
 488             ;
 489         }
 490         else if( p_playlist->p_input->b_error || p_playlist->p_input->b_eof )
 491         {
 492             input_StopThread( p_playlist->p_input );
 493             PL_UNLOCK;
 494             continue;
 495         }
 496         else
 497         {
 498             p_playlist->p_input->b_eof = 1;
 499         }
 500         PL_UNLOCK;
 501
 502         msleep( INTF_IDLE_SLEEP );
 503     }
 504
 505 #ifdef ENABLE_SOUT
 506     /* close the remaining sout-keep (if there was no input atm) */
 507     sout_instance_t *p_sout = libvlc_priv (p_playlist->p_libvlc)->p_sout;
 508     if (p_sout)
 509         sout_DeleteInstance( p_sout );
 510 #endif
 511
 512     /* Core should have terminated all SDs before the playlist */
 513     /* TODO: It fails to do so when not playing anything -- Courmisch */
 514     playlist_ServicesDiscoveryKillAll( p_playlist );
 515     playlist_MLDump( p_playlist );
 516
 517     vlc_object_kill( p_playlist->p_preparse );
 518     vlc_thread_join( p_playlist->p_preparse );
 519     vlc_object_kill( p_playlist->p_fetcher );
 520     vlc_thread_join( p_playlist->p_fetcher );
 521
 522     PL_LOCK;
 523
 524     /* Release the current node */
 525     set_current_status_node( p_playlist, NULL );
 526
 527     /* Release the current item */
 528     set_current_status_item( p_playlist, NULL );
 529
 530     FOREACH_ARRAY( playlist_item_t *p_del, p_playlist->all_items )
 531         free( p_del->pp_children );
 532         vlc_gc_decref( p_del->p_input );
 533         free( p_del );
 534     FOREACH_END();
 535     ARRAY_RESET( p_playlist->all_items );
 536     FOREACH_ARRAY( playlist_item_t *p_del, p_playlist->items_to_delete )
 537         free( p_del->pp_children );
 538         vlc_gc_decref( p_del->p_input );
 539         free( p_del );
 540     FOREACH_END();
 541     ARRAY_RESET( p_playlist->items_to_delete );
 542
 543     ARRAY_RESET( p_playlist->items );
 544     ARRAY_RESET( p_playlist->current );
 545
 546     PL_UNLOCK;
 547 }
 548
 549 /**
 550  * Preparse loop
 551  *
 552  * Main loop for preparser queue
 553  * \param p_obj items to preparse
 554  * \return nothing
 555  */
 556 void playlist_PreparseLoop( playlist_preparse_t *p_obj )
 557 {
 558     playlist_t *p_playlist = (playlist_t *)p_obj->p_parent;
 559     input_item_t *p_current;
 560     int i_activity;
 561
 562     vlc_object_lock( p_obj );
 563
 564     while( vlc_object_alive( p_obj ) )
 565     {
 566         if( p_obj->i_waiting == 0 )
 567         {
 568             vlc_object_wait( p_obj );
 569             continue;
 570         }
 571
 572         p_current = p_obj->pp_waiting[0];
 573         REMOVE_ELEM( p_obj->pp_waiting, p_obj->i_waiting, 0 );
 574         vlc_object_unlock( p_obj );
 575
 576         PL_LOCK;
 577         if( p_current )
 578         {
 579             if( p_current->i_type == ITEM_TYPE_FILE )
 580             {
 581                 stats_TimerStart( p_playlist, "Preparse run",
 582                                   STATS_TIMER_PREPARSE );
 583                 /* Do not preparse if it is already done (like by playing it) */
 584                 if( !input_item_IsPreparsed( p_current ) )
 585                 {
 586                     PL_UNLOCK;
 587                     input_Preparse( p_playlist, p_current );
 588                     PL_LOCK;
 589                 }
 590                 stats_TimerStop( p_playlist, STATS_TIMER_PREPARSE );
 591                 PL_UNLOCK;
 592                 input_item_SetPreparsed( p_current, true );
 593                 var_SetInteger( p_playlist, "item-change", p_current->i_id );
 594                 PL_LOCK;
 595             }
 596             /* If we haven't retrieved enough meta, add to secondary queue
 597              * which will run the "meta fetchers".
 598              * This only checks for meta, not for art
 599              * \todo don't do this for things we won't get meta for, like vids
 600              */
 601             char *psz_arturl = input_item_GetArtURL( p_current );
 602             char *psz_name = input_item_GetName( p_current );
 603             if( p_playlist->p_fetcher->i_art_policy == ALBUM_ART_ALL &&
 604                         ( !psz_arturl || strncmp( psz_arturl, "file://", 7 ) ) )
 605             {
 606                 PL_DEBUG("meta ok for %s, need to fetch art", psz_name );
 607                 vlc_object_lock( p_playlist->p_fetcher );
 608                 if( vlc_object_alive( p_playlist->p_fetcher ) )
 609                 {
 610                     INSERT_ELEM( p_playlist->p_fetcher->pp_waiting,
 611                         p_playlist->p_fetcher->i_waiting,
 612                         p_playlist->p_fetcher->i_waiting, p_current);
 613                     vlc_object_signal_unlocked( p_playlist->p_fetcher );
 614                 }
 615                 else
 616                     vlc_gc_decref( p_current );
 617                 vlc_object_unlock( p_playlist->p_fetcher );
 618             }
 619             else
 620             {
 621                 PL_DEBUG( "no fetch required for %s (art currently %s)",
 622                           psz_name, psz_arturl );
 623                 vlc_gc_decref( p_current );
 624             }
 625             free( psz_name );
 626             free( psz_arturl );
 627             PL_UNLOCK;
 628         }
 629         else
 630             PL_UNLOCK;
 631
 632         vlc_object_lock( p_obj );
 633         i_activity = var_GetInteger( p_playlist, "activity" );
 634         if( i_activity < 0 ) i_activity = 0;
 635         vlc_object_unlock( p_obj );
 636         /* Sleep at least 1ms */
 637         msleep( (i_activity+1) * 1000 );
 638         vlc_object_lock( p_obj );
 639     }
 640
 641     while( p_obj->i_waiting > 0 )
 642     {
 643         vlc_gc_decref( p_obj->pp_waiting[0] );
 644         REMOVE_ELEM( p_obj->pp_waiting, p_obj->i_waiting, 0 );
 645     }
 646
 647     vlc_object_unlock( p_obj );
 648 }
 649
 650 /**
 651  * Fetcher loop
 652  *
 653  * Main loop for secondary preparser queue
 654  * \param p_obj items to preparse
 655  * \return nothing
 656  */
 657 void playlist_FetcherLoop( playlist_fetcher_t *p_obj )
 658 {
 659     playlist_t *p_playlist = (playlist_t *)p_obj->p_parent;
 660     input_item_t *p_item;
 661     int i_activity;
 662
 663     vlc_object_lock( p_obj );
 664
 665     while( vlc_object_alive( p_obj ) )
 666     {
 667         if( p_obj->i_waiting == 0 )
 668         {
 669             vlc_object_wait( p_obj );
 670             continue;
 671         }
 672
 673         p_item = p_obj->pp_waiting[0];
 674         REMOVE_ELEM( p_obj->pp_waiting, p_obj->i_waiting, 0 );
 675         vlc_object_unlock( p_obj );
 676         if( p_item )
 677         {
 678             int i_ret;
 679
 680             /* Check if it is not yet preparsed and if so wait for it (at most 0.5s)
 681              * (This can happen if we fetch art on play)
 682              * FIXME this doesn't work if we need to fetch meta before art ... */
 683             for( i_ret = 0; i_ret < 10 && !input_item_IsPreparsed( p_item ); i_ret++ )
 684             {
 685                 bool b_break;
 686                 PL_LOCK;
 687                 b_break = ( !p_playlist->p_input || input_GetItem(p_playlist->p_input) != p_item  ||
 688                             p_playlist->p_input->b_die || p_playlist->p_input->b_eof || p_playlist->p_input->b_error );
 689                 PL_UNLOCK;
 690                 if( b_break )
 691                     break;
 692                 msleep( 50000 );
 693             }
 694
 695             i_ret = input_ArtFind( p_playlist, p_item );
 696             if( i_ret == 1 )
 697             {
 698                 PL_DEBUG( "downloading art for %s", p_item->psz_name );
 699                 if( input_DownloadAndCacheArt( p_playlist, p_item ) )
 700                     input_item_SetArtNotFound( p_item, true );
 701                 else {
 702                     input_item_SetArtFetched( p_item, true );
 703                     var_SetInteger( p_playlist, "item-change",
 704                                     p_item->i_id );
 705                 }
 706             }
 707             else if( i_ret == 0 ) /* Was in cache */
 708             {
 709                 PL_DEBUG( "found art for %s in cache", p_item->psz_name );
 710                 input_item_SetArtFetched( p_item, true );
 711                 var_SetInteger( p_playlist, "item-change", p_item->i_id );
 712             }
 713             else
 714             {
 715                 PL_DEBUG( "art not found for %s", p_item->psz_name );
 716                 input_item_SetArtNotFound( p_item, true );
 717             }
 718             vlc_gc_decref( p_item );
 719         }
 720         vlc_object_lock( p_obj );
 721         i_activity = var_GetInteger( p_playlist, "activity" );
 722         if( i_activity < 0 ) i_activity = 0;
 723         vlc_object_unlock( p_obj );
 724         /* Sleep at least 1ms */
 725         msleep( (i_activity+1) * 1000 );
 726         vlc_object_lock( p_obj );
 727     }
 728
 729     while( p_obj->i_waiting > 0 )
 730     {
 731         vlc_gc_decref( p_obj->pp_waiting[0] );
 732         REMOVE_ELEM( p_obj->pp_waiting, p_obj->i_waiting, 0 );
 733     }
 734
 735     vlc_object_unlock( p_obj );
 736 }
 737
 738 static void VariablesInit( playlist_t *p_playlist )
 739 {
 740     vlc_value_t val;
 741     /* These variables control updates */
 742     var_Create( p_playlist, "intf-change", VLC_VAR_BOOL );
 743     val.b_bool = true;
 744     var_Set( p_playlist, "intf-change", val );
 745
 746     var_Create( p_playlist, "item-change", VLC_VAR_INTEGER );
 747     val.i_int = -1;
 748     var_Set( p_playlist, "item-change", val );
 749
 750     var_Create( p_playlist, "item-deleted", VLC_VAR_INTEGER );
 751     val.i_int = -1;
 752     var_Set( p_playlist, "item-deleted", val );
 753
 754     var_Create( p_playlist, "item-append", VLC_VAR_ADDRESS );
 755
 756     var_Create( p_playlist, "playlist-current", VLC_VAR_INTEGER );
 757     val.i_int = -1;
 758     var_Set( p_playlist, "playlist-current", val );
 759
 760     var_Create( p_playlist, "activity", VLC_VAR_INTEGER );
 761     var_SetInteger( p_playlist, "activity", 0 );
 762
 763     /* Variables to control playback */
 764     var_CreateGetBool( p_playlist, "play-and-stop" );
 765     var_CreateGetBool( p_playlist, "play-and-exit" );
 766     var_CreateGetBool( p_playlist, "random" );
 767     var_CreateGetBool( p_playlist, "repeat" );
 768     var_CreateGetBool( p_playlist, "loop" );
 769
 770     var_AddCallback( p_playlist, "random", RandomCallback, NULL );
 771 }