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
  42 static int RandomCallback( vlc_object_t *p_this, char const *psz_cmd,
  43                            vlc_value_t oldval, vlc_value_t newval, void *a )
  44 {
  45     (void)psz_cmd; (void)oldval; (void)newval; (void)a;
  46
  47     ((playlist_t*)p_this)->b_reset_currently_playing = true;
  48     playlist_Signal( ((playlist_t*)p_this) );
  49     return VLC_SUCCESS;
  50 }
  51
  52 /**
  53  * Create playlist
  54  *
  55  * Create a playlist structure.
  56  * \param p_parent the vlc object that is to be the parent of this playlist
  57  * \return a pointer to the created playlist, or NULL on error
  58  */
  59 playlist_t * playlist_Create( vlc_object_t *p_parent )
  60 {
  61     static const char playlist_name[] = "playlist";
  62     playlist_t *p_playlist;
  63     bool b_save;
  64
  65     /* Allocate structure */
  66     p_playlist = vlc_custom_create( p_parent, sizeof( *p_playlist ),
  67                                     VLC_OBJECT_GENERIC, playlist_name );
  68     if( !p_playlist )
  69         return NULL;
  70
  71     TAB_INIT( p_playlist->i_sds, p_playlist->pp_sds );
  72     MALLOC_NULL( p_playlist->p, playlist_private_t );
  73     memset( p_playlist->p, 0, sizeof( playlist_private_t ) );
  74
  75     libvlc_priv(p_parent->p_libvlc)->p_playlist = p_playlist;
  76
  77     VariablesInit( p_playlist );
  78
  79     /* Initialise data structures */
  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     PL_LOCK; /* playlist_NodeCreate will check for it */
 103     p_playlist->p_root_category = playlist_NodeCreate( p_playlist, NULL, NULL,
 104                                     0, NULL );
 105     p_playlist->p_root_onelevel = playlist_NodeCreate( p_playlist, NULL, NULL,
 106                                     0, p_playlist->p_root_category->p_input );
 107     PL_UNLOCK;
 108
 109     if( !p_playlist->p_root_category || !p_playlist->p_root_onelevel )
 110         return NULL;
 111
 112     /* Create playlist and media library */
 113     PL_LOCK; /* playlist_NodesPairCreate will check for it */
 114     playlist_NodesPairCreate( p_playlist, _( "Playlist" ),
 115                             &p_playlist->p_local_category,
 116                             &p_playlist->p_local_onelevel, false );
 117     PL_UNLOCK;
 118
 119     p_playlist->p_local_category->i_flags |= PLAYLIST_RO_FLAG;
 120     p_playlist->p_local_onelevel->i_flags |= PLAYLIST_RO_FLAG;
 121
 122     if( !p_playlist->p_local_category || !p_playlist->p_local_onelevel ||
 123         !p_playlist->p_local_category->p_input ||
 124         !p_playlist->p_local_onelevel->p_input )
 125         return NULL;
 126
 127     if( config_GetInt( p_playlist, "media-library") )
 128     {
 129         PL_LOCK; /* playlist_NodesPairCreate will check for it */
 130         playlist_NodesPairCreate( p_playlist, _( "Media Library" ),
 131                             &p_playlist->p_ml_category,
 132                             &p_playlist->p_ml_onelevel, false );
 133         PL_UNLOCK;
 134
 135         if(!p_playlist->p_ml_category || !p_playlist->p_ml_onelevel)
 136             return NULL;
 137
 138         p_playlist->p_ml_category->i_flags |= PLAYLIST_RO_FLAG;
 139         p_playlist->p_ml_onelevel->i_flags |= PLAYLIST_RO_FLAG;
 140     }
 141     else
 142     {
 143         p_playlist->p_ml_category = p_playlist->p_ml_onelevel = NULL;
 144     }
 145
 146     /* Initial status */
 147     p_playlist->status.p_item = NULL;
 148     p_playlist->status.p_node = p_playlist->p_local_onelevel;
 149     p_playlist->request.b_request = false;
 150     p_playlist->status.i_status = PLAYLIST_STOPPED;
 151
 152     p_playlist->i_sort = SORT_ID;
 153     p_playlist->i_order = ORDER_NORMAL;
 154
 155
 156     b_save = p_playlist->b_auto_preparse;
 157     p_playlist->b_auto_preparse = false;
 158     playlist_MLLoad( p_playlist );
 159     p_playlist->b_auto_preparse = true;
 160
 161     vlc_object_set_destructor( p_playlist, playlist_Destructor );
 162
 163     return p_playlist;
 164 }
 165
 166 /**
 167  * Destroy playlist
 168  *
 169  * Destroy a playlist structure.
 170  * \param p_playlist the playlist object
 171  * \return nothing
 172  */
 173
 174 static void playlist_Destructor( vlc_object_t * p_this )
 175 {
 176     playlist_t * p_playlist = (playlist_t *)p_this;
 177
 178     if( p_playlist->p->p_preparse )
 179     {
 180         vlc_object_release( p_playlist->p->p_preparse );
 181     }
 182
 183     if( p_playlist->p->p_fetcher )
 184     {
 185         vlc_object_release( p_playlist->p->p_fetcher );
 186     }
 187     msg_Dbg( p_this, "Destroyed" );
 188 }
 189
 190 /* Destroy remaining objects */
 191 static void ObjectGarbageCollector( playlist_t *p_playlist, bool b_force )
 192 {
 193     if( !b_force )
 194     {
 195         if( mdate() - p_playlist->gc_date < 1000000 )
 196         {
 197             p_playlist->b_cant_sleep = true;
 198             return;
 199         }
 200         else if( p_playlist->gc_date == 0 )
 201             return;
 202     }
 203
 204     p_playlist->b_cant_sleep = false;
 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_thread_join( p_input );
 246     vlc_object_release( p_input );
 247     PL_LOCK;
 248 }
 249
 250 void playlist_set_current_input(
 251     playlist_t * p_playlist, input_thread_t * p_input )
 252 {
 253     PL_ASSERT_LOCKED;
 254
 255     playlist_release_current_input( p_playlist );
 256
 257     if( p_input )
 258     {
 259         vlc_object_yield( p_input );
 260         p_playlist->p_input = p_input;
 261         vlc_event_manager_t * p_em = input_get_event_manager( p_input );
 262         vlc_event_attach( p_em, vlc_InputStateChanged,
 263                           input_state_changed, p_playlist );
 264         vlc_event_attach( p_em, vlc_InputSelectedStreamChanged,
 265                           input_selected_stream_changed, p_playlist );
 266     }
 267 }
 268
 269 /** Get current playing input.
 270  */
 271 input_thread_t * playlist_CurrentInput( playlist_t * p_playlist )
 272 {
 273     input_thread_t * p_input;
 274     PL_LOCK;
 275     p_input = p_playlist->p_input;
 276     if( p_input ) vlc_object_yield( p_input );
 277     PL_UNLOCK;
 278     return p_input;
 279 }
 280
 281 /**
 282  * @}
 283  */
 284
 285 /** Accessor for status item and status nodes.
 286  */
 287 playlist_item_t * get_current_status_item( playlist_t * p_playlist )
 288 {
 289     PL_ASSERT_LOCKED;
 290
 291     return p_playlist->status.p_item;
 292 }
 293
 294 playlist_item_t * get_current_status_node( playlist_t * p_playlist )
 295 {
 296     PL_ASSERT_LOCKED;
 297
 298     return p_playlist->status.p_node;
 299 }
 300
 301 void set_current_status_item( playlist_t * p_playlist,
 302     playlist_item_t * p_item )
 303 {
 304     PL_ASSERT_LOCKED;
 305
 306     if( p_playlist->status.p_item &&
 307         p_playlist->status.p_item->i_flags & PLAYLIST_REMOVE_FLAG &&
 308         p_playlist->status.p_item != p_item )
 309     {
 310         /* It's unsafe given current design to delete a playlist item :(
 311         playlist_ItemDelete( p_playlist->status.p_item ); */
 312     }
 313     p_playlist->status.p_item = p_item;
 314 }
 315
 316 void set_current_status_node( playlist_t * p_playlist,
 317     playlist_item_t * p_node )
 318 {
 319     PL_ASSERT_LOCKED;
 320
 321     if( p_playlist->status.p_node &&
 322         p_playlist->status.p_node->i_flags & PLAYLIST_REMOVE_FLAG &&
 323         p_playlist->status.p_node != p_node )
 324     {
 325         /* It's unsafe given current design to delete a playlist item :(
 326         playlist_ItemDelete( p_playlist->status.p_node ); */
 327     }
 328     p_playlist->status.p_node = p_node;
 329 }
 330
 331 /**
 332  * Main loop
 333  *
 334  * Main loop for the playlist. It should be entered with the
 335  * playlist lock (otherwise input event may be lost)
 336  * \param p_playlist the playlist object
 337  * \return nothing
 338  */
 339 void playlist_MainLoop( playlist_t *p_playlist )
 340 {
 341     playlist_item_t *p_item = NULL;
 342     bool b_playexit = var_GetBool( p_playlist, "play-and-exit" );
 343
 344     PL_ASSERT_LOCKED;
 345
 346     if( p_playlist->b_reset_currently_playing &&
 347         mdate() - p_playlist->last_rebuild_date > 30000 ) // 30 ms
 348     {
 349         ResetCurrentlyPlaying( p_playlist, var_GetBool( p_playlist, "random" ),
 350                                get_current_status_item( p_playlist ) );
 351         p_playlist->last_rebuild_date = mdate();
 352     }
 353
 354 check_input:
 355     /* If there is an input, check that it doesn't need to die. */
 356     if( p_playlist->p_input )
 357     {
 358         if( p_playlist->request.b_request && !p_playlist->p_input->b_die )
 359         {
 360             PL_DEBUG( "incoming request - stopping current input" );
 361             input_StopThread( p_playlist->p_input );
 362         }
 363
 364         /* This input is dead. Remove it ! */
 365         if( p_playlist->p_input->b_dead )
 366         {
 367             int i_activity;
 368             input_thread_t *p_input;
 369             sout_instance_t **pp_sout = &p_playlist->p->p_sout;
 370
 371             PL_DEBUG( "dead input" );
 372
 373             p_input = p_playlist->p_input;
 374
 375             assert( *pp_sout == NULL );
 376             if( var_CreateGetBool( p_input, "sout-keep" ) )
 377                 *pp_sout = input_DetachSout( p_input );
 378
 379             /* Destroy input */
 380             playlist_release_current_input( p_playlist );
 381
 382             p_playlist->gc_date = mdate();
 383             p_playlist->b_cant_sleep = true;
 384
 385             i_activity= var_GetInteger( p_playlist, "activity" );
 386             var_SetInteger( p_playlist, "activity", i_activity -
 387                             DEFAULT_INPUT_ACTIVITY );
 388
 389             goto check_input;
 390         }
 391         /* This input is dying, let it do */
 392         else if( p_playlist->p_input->b_die )
 393         {
 394             PL_DEBUG( "dying input" );
 395             PL_UNLOCK;
 396             msleep( INTF_IDLE_SLEEP );
 397             PL_LOCK;
 398             goto check_input;
 399         }
 400         /* This input has finished, ask it to die ! */
 401         else if( p_playlist->p_input->b_error
 402                   || p_playlist->p_input->b_eof )
 403         {
 404             PL_DEBUG( "finished input" );
 405             input_StopThread( p_playlist->p_input );
 406             /* No need to wait here, we'll wait in the p_input->b_die case */
 407             goto check_input;
 408         }
 409         else if( p_playlist->p_input->i_state != INIT_S )
 410         {
 411             ObjectGarbageCollector( p_playlist, false );
 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
 434                 if( b_playexit == true )
 435                 {
 436                     msg_Info( p_playlist, "end of playlist, exiting" );
 437                     vlc_object_kill( p_playlist->p_libvlc );
 438                 }
 439                 ObjectGarbageCollector( p_playlist, true );
 440                 return;
 441             }
 442             playlist_PlayItem( p_playlist, p_item );
 443             /* playlist_PlayItem loose input event, we need to recheck */
 444             goto check_input;
 445         }
 446         else
 447         {
 448             const bool b_gc_forced = p_playlist->status.i_status != PLAYLIST_STOPPED;
 449
 450             p_playlist->status.i_status = PLAYLIST_STOPPED;
 451
 452             /* Collect garbage */
 453             ObjectGarbageCollector( p_playlist, b_gc_forced );
 454         }
 455     }
 456 }
 457
 458 /**
 459  * Last loop
 460  *
 461  * The playlist is dying so do the last loop
 462  * \param p_playlist the playlist object
 463  * \return nothing
 464 */
 465 void playlist_LastLoop( playlist_t *p_playlist )
 466 {
 467     /* If there is an input, kill it */
 468     while( 1 )
 469     {
 470         PL_LOCK;
 471         if( p_playlist->p_input == NULL )
 472         {
 473             PL_UNLOCK;
 474             break;
 475         }
 476
 477         if( p_playlist->p_input->b_dead )
 478         {
 479             /* remove input */
 480             playlist_release_current_input( p_playlist );
 481
 482             /* sout-keep: no need to anything here.
 483              * The last input will destroy its sout, if any, by itself */
 484
 485             PL_UNLOCK;
 486             continue;
 487         }
 488         else if( p_playlist->p_input->b_die )
 489         {
 490             /* This input is dying, leave it alone */
 491             ;
 492         }
 493         else if( p_playlist->p_input->b_error || p_playlist->p_input->b_eof )
 494         {
 495             input_StopThread( p_playlist->p_input );
 496             PL_UNLOCK;
 497             continue;
 498         }
 499         else
 500         {
 501             p_playlist->p_input->b_eof = 1;
 502         }
 503         PL_UNLOCK;
 504
 505         msleep( INTF_IDLE_SLEEP );
 506     }
 507
 508 #ifdef ENABLE_SOUT
 509     /* close the remaining sout-keep (if there was no input atm) */
 510     sout_instance_t *p_sout = p_playlist->p->p_sout;
 511     if (p_sout)
 512         sout_DeleteInstance( p_sout );
 513 #endif
 514
 515     /* Core should have terminated all SDs before the playlist */
 516     /* TODO: It fails to do so when not playing anything -- Courmisch */
 517     playlist_ServicesDiscoveryKillAll( p_playlist );
 518     playlist_MLDump( p_playlist );
 519
 520     vlc_object_kill( p_playlist->p->p_preparse );
 521     vlc_thread_join( p_playlist->p->p_preparse );
 522     vlc_object_kill( p_playlist->p->p_fetcher );
 523     vlc_thread_join( p_playlist->p->p_fetcher );
 524
 525     PL_LOCK;
 526
 527     /* Release the current node */
 528     set_current_status_node( p_playlist, NULL );
 529
 530     /* Release the current item */
 531     set_current_status_item( p_playlist, NULL );
 532
 533     FOREACH_ARRAY( playlist_item_t *p_del, p_playlist->all_items )
 534         free( p_del->pp_children );
 535         vlc_gc_decref( p_del->p_input );
 536         free( p_del );
 537     FOREACH_END();
 538     ARRAY_RESET( p_playlist->all_items );
 539     FOREACH_ARRAY( playlist_item_t *p_del, p_playlist->items_to_delete )
 540         free( p_del->pp_children );
 541         vlc_gc_decref( p_del->p_input );
 542         free( p_del );
 543     FOREACH_END();
 544     ARRAY_RESET( p_playlist->items_to_delete );
 545
 546     ARRAY_RESET( p_playlist->items );
 547     ARRAY_RESET( p_playlist->current );
 548
 549     PL_UNLOCK;
 550 }
 551
 552 /**
 553  * Preparse loop
 554  *
 555  * Main loop for preparser queue
 556  * \param p_obj items to preparse
 557  * \return nothing
 558  */
 559 void playlist_PreparseLoop( playlist_preparse_t *p_obj )
 560 {
 561     playlist_t *p_playlist = (playlist_t *)p_obj->p_parent;
 562     input_item_t *p_current;
 563     int i_activity;
 564
 565     vlc_object_lock( p_obj );
 566
 567     while( vlc_object_alive( p_obj ) )
 568     {
 569         if( p_obj->i_waiting == 0 )
 570         {
 571             vlc_object_wait( p_obj );
 572             continue;
 573         }
 574
 575         p_current = p_obj->pp_waiting[0];
 576         REMOVE_ELEM( p_obj->pp_waiting, p_obj->i_waiting, 0 );
 577         vlc_object_unlock( p_obj );
 578
 579         PL_LOCK;
 580         if( p_current )
 581         {
 582             if( p_current->i_type == ITEM_TYPE_FILE )
 583             {
 584                 stats_TimerStart( p_playlist, "Preparse run",
 585                                   STATS_TIMER_PREPARSE );
 586                 /* Do not preparse if it is already done (like by playing it) */
 587                 if( !input_item_IsPreparsed( p_current ) )
 588                 {
 589                     PL_UNLOCK;
 590                     input_Preparse( p_playlist, p_current );
 591                     PL_LOCK;
 592                 }
 593                 stats_TimerStop( p_playlist, STATS_TIMER_PREPARSE );
 594                 PL_UNLOCK;
 595                 input_item_SetPreparsed( p_current, true );
 596                 var_SetInteger( p_playlist, "item-change", p_current->i_id );
 597                 PL_LOCK;
 598             }
 599             /* If we haven't retrieved enough meta, add to secondary queue
 600              * which will run the "meta fetchers".
 601              * This only checks for meta, not for art
 602              * \todo don't do this for things we won't get meta for, like vids
 603              */
 604             char *psz_arturl = input_item_GetArtURL( p_current );
 605             char *psz_name = input_item_GetName( p_current );
 606             if( p_playlist->p->p_fetcher->i_art_policy == ALBUM_ART_ALL &&
 607                         ( !psz_arturl || strncmp( psz_arturl, "file://", 7 ) ) )
 608             {
 609                 PL_DEBUG("meta ok for %s, need to fetch art", psz_name );
 610                 vlc_object_lock( p_playlist->p->p_fetcher );
 611                 if( vlc_object_alive( p_playlist->p->p_fetcher ) )
 612                 {
 613                     INSERT_ELEM( p_playlist->p->p_fetcher->pp_waiting,
 614                         p_playlist->p->p_fetcher->i_waiting,
 615                         p_playlist->p->p_fetcher->i_waiting, p_current);
 616                     vlc_object_signal_unlocked( p_playlist->p->p_fetcher );
 617                 }
 618                 else
 619                     vlc_gc_decref( p_current );
 620                 vlc_object_unlock( p_playlist->p->p_fetcher );
 621             }
 622             else
 623             {
 624                 PL_DEBUG( "no fetch required for %s (art currently %s)",
 625                           psz_name, psz_arturl );
 626                 vlc_gc_decref( p_current );
 627             }
 628             free( psz_name );
 629             free( psz_arturl );
 630             PL_UNLOCK;
 631         }
 632         else
 633             PL_UNLOCK;
 634
 635         vlc_object_lock( p_obj );
 636         i_activity = var_GetInteger( p_playlist, "activity" );
 637         if( i_activity < 0 ) i_activity = 0;
 638         vlc_object_unlock( p_obj );
 639         /* Sleep at least 1ms */
 640         msleep( (i_activity+1) * 1000 );
 641         vlc_object_lock( p_obj );
 642     }
 643
 644     while( p_obj->i_waiting > 0 )
 645     {
 646         vlc_gc_decref( p_obj->pp_waiting[0] );
 647         REMOVE_ELEM( p_obj->pp_waiting, p_obj->i_waiting, 0 );
 648     }
 649
 650     vlc_object_unlock( p_obj );
 651 }
 652
 653 /**
 654  * Fetcher loop
 655  *
 656  * Main loop for secondary preparser queue
 657  * \param p_obj items to preparse
 658  * \return nothing
 659  */
 660 void playlist_FetcherLoop( playlist_fetcher_t *p_obj )
 661 {
 662     playlist_t *p_playlist = (playlist_t *)p_obj->p_parent;
 663     input_item_t *p_item;
 664     int i_activity;
 665
 666     vlc_object_lock( p_obj );
 667
 668     while( vlc_object_alive( p_obj ) )
 669     {
 670         if( p_obj->i_waiting == 0 )
 671         {
 672             vlc_object_wait( p_obj );
 673             continue;
 674         }
 675
 676         p_item = p_obj->pp_waiting[0];
 677         REMOVE_ELEM( p_obj->pp_waiting, p_obj->i_waiting, 0 );
 678         vlc_object_unlock( p_obj );
 679         if( p_item )
 680         {
 681             int i_ret;
 682
 683             /* Check if it is not yet preparsed and if so wait for it (at most 0.5s)
 684              * (This can happen if we fetch art on play)
 685              * FIXME this doesn't work if we need to fetch meta before art ... */
 686             for( i_ret = 0; i_ret < 10 && !input_item_IsPreparsed( p_item ); i_ret++ )
 687             {
 688                 bool b_break;
 689                 PL_LOCK;
 690                 b_break = ( !p_playlist->p_input || input_GetItem(p_playlist->p_input) != p_item  ||
 691                             p_playlist->p_input->b_die || p_playlist->p_input->b_eof || p_playlist->p_input->b_error );
 692                 PL_UNLOCK;
 693                 if( b_break )
 694                     break;
 695                 msleep( 50000 );
 696             }
 697
 698             i_ret = input_ArtFind( p_playlist, p_item );
 699             if( i_ret == 1 )
 700             {
 701                 PL_DEBUG( "downloading art for %s", p_item->psz_name );
 702                 if( input_DownloadAndCacheArt( p_playlist, p_item ) )
 703                     input_item_SetArtNotFound( p_item, true );
 704                 else {
 705                     input_item_SetArtFetched( p_item, true );
 706                     var_SetInteger( p_playlist, "item-change",
 707                                     p_item->i_id );
 708                 }
 709             }
 710             else if( i_ret == 0 ) /* Was in cache */
 711             {
 712                 PL_DEBUG( "found art for %s in cache", p_item->psz_name );
 713                 input_item_SetArtFetched( p_item, true );
 714                 var_SetInteger( p_playlist, "item-change", p_item->i_id );
 715             }
 716             else
 717             {
 718                 PL_DEBUG( "art not found for %s", p_item->psz_name );
 719                 input_item_SetArtNotFound( p_item, true );
 720             }
 721             vlc_gc_decref( p_item );
 722         }
 723         vlc_object_lock( p_obj );
 724         i_activity = var_GetInteger( p_playlist, "activity" );
 725         if( i_activity < 0 ) i_activity = 0;
 726         vlc_object_unlock( p_obj );
 727         /* Sleep at least 1ms */
 728         msleep( (i_activity+1) * 1000 );
 729         vlc_object_lock( p_obj );
 730     }
 731
 732     while( p_obj->i_waiting > 0 )
 733     {
 734         vlc_gc_decref( p_obj->pp_waiting[0] );
 735         REMOVE_ELEM( p_obj->pp_waiting, p_obj->i_waiting, 0 );
 736     }
 737
 738     vlc_object_unlock( p_obj );
 739 }
 740
 741 static void VariablesInit( playlist_t *p_playlist )
 742 {
 743     vlc_value_t val;
 744     /* These variables control updates */
 745     var_Create( p_playlist, "intf-change", VLC_VAR_BOOL );
 746     val.b_bool = true;
 747     var_Set( p_playlist, "intf-change", val );
 748
 749     var_Create( p_playlist, "item-change", VLC_VAR_INTEGER );
 750     val.i_int = -1;
 751     var_Set( p_playlist, "item-change", val );
 752
 753     var_Create( p_playlist, "item-deleted", VLC_VAR_INTEGER );
 754     val.i_int = -1;
 755     var_Set( p_playlist, "item-deleted", val );
 756
 757     var_Create( p_playlist, "item-append", VLC_VAR_ADDRESS );
 758
 759     var_Create( p_playlist, "playlist-current", VLC_VAR_INTEGER );
 760     val.i_int = -1;
 761     var_Set( p_playlist, "playlist-current", val );
 762
 763     var_Create( p_playlist, "activity", VLC_VAR_INTEGER );
 764     var_SetInteger( p_playlist, "activity", 0 );
 765
 766     /* Variables to control playback */
 767     var_CreateGetBool( p_playlist, "play-and-stop" );
 768     var_CreateGetBool( p_playlist, "play-and-exit" );
 769     var_CreateGetBool( p_playlist, "random" );
 770     var_CreateGetBool( p_playlist, "repeat" );
 771     var_CreateGetBool( p_playlist, "loop" );
 772
 773     var_AddCallback( p_playlist, "random", RandomCallback, NULL );
 774 }