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