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->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     vlc_mutex_lock( &p_playlist->gc_lock );
 202     p_playlist->b_cant_sleep = false;
 203     vlc_mutex_unlock( &p_playlist->gc_lock );
 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          PL_DEBUG( "%s was marked for deletion, deleting",
 309                          PLI_NAME( p_playlist->status.p_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          PL_DEBUG( "%s was marked for deletion, deleting",
 325                          PLI_NAME( p_playlist->status.p_node  ) );
 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
 335  * \param p_playlist the playlist object
 336  * \return nothing
 337  */
 338 void playlist_MainLoop( playlist_t *p_playlist )
 339 {
 340     playlist_item_t *p_item = NULL;
 341     bool b_playexit = var_GetBool( p_playlist, "play-and-exit" );
 342     PL_LOCK;
 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             set_current_status_item( p_playlist, NULL );
 385
 386             i_activity= var_GetInteger( p_playlist, "activity" );
 387             var_SetInteger( p_playlist, "activity", i_activity -
 388                             DEFAULT_INPUT_ACTIVITY );
 389
 390             goto check_input;
 391         }
 392         /* This input is dying, let it do */
 393         else if( p_playlist->p_input->b_die )
 394         {
 395             PL_DEBUG( "dying input" );
 396             PL_UNLOCK;
 397             msleep( INTF_IDLE_SLEEP );
 398             PL_LOCK;
 399             goto check_input;
 400         }
 401         /* This input has finished, ask it to die ! */
 402         else if( p_playlist->p_input->b_error
 403                   || p_playlist->p_input->b_eof )
 404         {
 405             PL_DEBUG( "finished input" );
 406             input_StopThread( p_playlist->p_input );
 407             /* No need to wait here, we'll wait in the p_input->b_die case */
 408             goto check_input;
 409         }
 410         else if( p_playlist->p_input->i_state != INIT_S )
 411         {
 412             PL_UNLOCK;
 413             ObjectGarbageCollector( p_playlist, false );
 414             PL_LOCK;
 415         }
 416     }
 417     else
 418     {
 419         /* No input. Several cases
 420          *  - No request, running status -> start new item
 421          *  - No request, stopped status -> collect garbage
 422          *  - Request, running requested -> start new item
 423          *  - Request, stopped requested -> collect garbage
 424         */
 425         int i_status = p_playlist->request.b_request ?
 426             p_playlist->request.i_status : p_playlist->status.i_status;
 427         if( i_status != PLAYLIST_STOPPED )
 428         {
 429             msg_Dbg( p_playlist, "starting new item" );
 430             p_item = playlist_NextItem( p_playlist );
 431
 432             if( p_item == NULL )
 433             {
 434                 msg_Dbg( p_playlist, "nothing to play" );
 435                 p_playlist->status.i_status = PLAYLIST_STOPPED;
 436                 PL_UNLOCK;
 437
 438                 if( b_playexit == true )
 439                 {
 440                     msg_Info( p_playlist, "end of playlist, exiting" );
 441                     vlc_object_kill( p_playlist->p_libvlc );
 442                 }
 443                 ObjectGarbageCollector( p_playlist, true );
 444                 return;
 445              }
 446              playlist_PlayItem( p_playlist, p_item );
 447          }
 448          else
 449          {
 450             const bool b_gc_forced = p_playlist->status.i_status != PLAYLIST_STOPPED;
 451
 452             p_playlist->status.i_status = PLAYLIST_STOPPED;
 453             set_current_status_item( p_playlist, NULL );
 454
 455             /* Collect garbage */
 456             PL_UNLOCK;
 457             ObjectGarbageCollector( p_playlist, b_gc_forced );
 458             PL_LOCK;
 459         }
 460     }
 461     PL_UNLOCK;
 462 }
 463
 464 /**
 465  * Last loop
 466  *
 467  * The playlist is dying so do the last loop
 468  * \param p_playlist the playlist object
 469  * \return nothing
 470 */
 471 void playlist_LastLoop( playlist_t *p_playlist )
 472 {
 473     /* If there is an input, kill it */
 474     while( 1 )
 475     {
 476         PL_LOCK;
 477         if( p_playlist->p_input == NULL )
 478         {
 479             PL_UNLOCK;
 480             break;
 481         }
 482
 483         if( p_playlist->p_input->b_dead )
 484         {
 485             /* remove input */
 486             playlist_release_current_input( p_playlist );
 487
 488             /* sout-keep: no need to anything here.
 489              * The last input will destroy its sout, if any, by itself */
 490
 491             PL_UNLOCK;
 492             continue;
 493         }
 494         else if( p_playlist->p_input->b_die )
 495         {
 496             /* This input is dying, leave it alone */
 497             ;
 498         }
 499         else if( p_playlist->p_input->b_error || p_playlist->p_input->b_eof )
 500         {
 501             input_StopThread( p_playlist->p_input );
 502             PL_UNLOCK;
 503             continue;
 504         }
 505         else
 506         {
 507             p_playlist->p_input->b_eof = 1;
 508         }
 509         PL_UNLOCK;
 510
 511         msleep( INTF_IDLE_SLEEP );
 512     }
 513
 514 #ifdef ENABLE_SOUT
 515     /* close the remaining sout-keep (if there was no input atm) */
 516     sout_instance_t *p_sout = libvlc_priv (p_playlist->p_libvlc)->p_sout;
 517     if (p_sout)
 518         sout_DeleteInstance( p_sout );
 519 #endif
 520
 521     /* Core should have terminated all SDs before the playlist */
 522     /* TODO: It fails to do so when not playing anything -- Courmisch */
 523     playlist_ServicesDiscoveryKillAll( p_playlist );
 524     playlist_MLDump( p_playlist );
 525
 526     vlc_object_kill( p_playlist->p_preparse );
 527     vlc_thread_join( p_playlist->p_preparse );
 528     vlc_object_kill( p_playlist->p_fetcher );
 529     vlc_thread_join( p_playlist->p_fetcher );
 530
 531     PL_LOCK;
 532
 533     /* Release the current node */
 534     set_current_status_node( p_playlist, NULL );
 535
 536     /* Release the current item */
 537     set_current_status_item( p_playlist, NULL );
 538
 539     FOREACH_ARRAY( playlist_item_t *p_del, p_playlist->all_items )
 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->all_items );
 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_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_fetcher );
 611                 if( vlc_object_alive( p_playlist->p_fetcher ) )
 612                 {
 613                     INSERT_ELEM( p_playlist->p_fetcher->pp_waiting,
 614                         p_playlist->p_fetcher->i_waiting,
 615                         p_playlist->p_fetcher->i_waiting, p_current);
 616                     vlc_object_signal_unlocked( p_playlist->p_fetcher );
 617                 }
 618                 else
 619                     vlc_gc_decref( p_current );
 620                 vlc_object_unlock( p_playlist->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 }