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