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             set_current_status_item( p_playlist, NULL );
 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             PL_UNLOCK;
 412             ObjectGarbageCollector( p_playlist, false );
 413             PL_LOCK;
 414         }
 415     }
 416     else
 417     {
 418         /* No input. Several cases
 419          *  - No request, running status -> start new item
 420          *  - No request, stopped status -> collect garbage
 421          *  - Request, running requested -> start new item
 422          *  - Request, stopped requested -> collect garbage
 423         */
 424         int i_status = p_playlist->request.b_request ?
 425             p_playlist->request.i_status : p_playlist->status.i_status;
 426         if( i_status != PLAYLIST_STOPPED )
 427         {
 428             msg_Dbg( p_playlist, "starting new item" );
 429             p_item = playlist_NextItem( p_playlist );
 430
 431             if( p_item == NULL )
 432             {
 433                 msg_Dbg( p_playlist, "nothing to play" );
 434                 p_playlist->status.i_status = PLAYLIST_STOPPED;
 435                 PL_UNLOCK;
 436
 437                 if( b_playexit == true )
 438                 {
 439                     msg_Info( p_playlist, "end of playlist, exiting" );
 440                     vlc_object_kill( p_playlist->p_libvlc );
 441                 }
 442                 ObjectGarbageCollector( p_playlist, true );
 443                 return;
 444             }
 445             playlist_PlayItem( p_playlist, p_item );
 446         }
 447         else
 448         {
 449             const bool b_gc_forced = p_playlist->status.i_status != PLAYLIST_STOPPED;
 450
 451             p_playlist->status.i_status = PLAYLIST_STOPPED;
 452             set_current_status_item( p_playlist, NULL );
 453
 454             /* Collect garbage */
 455             PL_UNLOCK;
 456             ObjectGarbageCollector( p_playlist, b_gc_forced );
 457             PL_LOCK;
 458         }
 459     }
 460     PL_UNLOCK;
 461 }
 462
 463 /**
 464  * Last loop
 465  *
 466  * The playlist is dying so do the last loop
 467  * \param p_playlist the playlist object
 468  * \return nothing
 469 */
 470 void playlist_LastLoop( playlist_t *p_playlist )
 471 {
 472     /* If there is an input, kill it */
 473     while( 1 )
 474     {
 475         PL_LOCK;
 476         if( p_playlist->p_input == NULL )
 477         {
 478             PL_UNLOCK;
 479             break;
 480         }
 481
 482         if( p_playlist->p_input->b_dead )
 483         {
 484             /* remove input */
 485             playlist_release_current_input( p_playlist );
 486
 487             /* sout-keep: no need to anything here.
 488              * The last input will destroy its sout, if any, by itself */
 489
 490             PL_UNLOCK;
 491             continue;
 492         }
 493         else if( p_playlist->p_input->b_die )
 494         {
 495             /* This input is dying, leave it alone */
 496             ;
 497         }
 498         else if( p_playlist->p_input->b_error || p_playlist->p_input->b_eof )
 499         {
 500             input_StopThread( p_playlist->p_input );
 501             PL_UNLOCK;
 502             continue;
 503         }
 504         else
 505         {
 506             p_playlist->p_input->b_eof = 1;
 507         }
 508         PL_UNLOCK;
 509
 510         msleep( INTF_IDLE_SLEEP );
 511     }
 512
 513 #ifdef ENABLE_SOUT
 514     /* close the remaining sout-keep (if there was no input atm) */
 515     sout_instance_t *p_sout = libvlc_priv (p_playlist->p_libvlc)->p_sout;
 516     if (p_sout)
 517         sout_DeleteInstance( p_sout );
 518 #endif
 519
 520     /* Core should have terminated all SDs before the playlist */
 521     /* TODO: It fails to do so when not playing anything -- Courmisch */
 522     playlist_ServicesDiscoveryKillAll( p_playlist );
 523     playlist_MLDump( p_playlist );
 524
 525     vlc_object_kill( p_playlist->p_preparse );
 526     vlc_thread_join( p_playlist->p_preparse );
 527     vlc_object_kill( p_playlist->p_fetcher );
 528     vlc_thread_join( p_playlist->p_fetcher );
 529
 530     PL_LOCK;
 531
 532     /* Release the current node */
 533     set_current_status_node( p_playlist, NULL );
 534
 535     /* Release the current item */
 536     set_current_status_item( p_playlist, NULL );
 537
 538     FOREACH_ARRAY( playlist_item_t *p_del, p_playlist->all_items )
 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->all_items );
 544     FOREACH_ARRAY( playlist_item_t *p_del, p_playlist->items_to_delete )
 545         free( p_del->pp_children );
 546         vlc_gc_decref( p_del->p_input );
 547         free( p_del );
 548     FOREACH_END();
 549     ARRAY_RESET( p_playlist->items_to_delete );
 550
 551     ARRAY_RESET( p_playlist->items );
 552     ARRAY_RESET( p_playlist->current );
 553
 554     PL_UNLOCK;
 555 }
 556
 557 /**
 558  * Preparse loop
 559  *
 560  * Main loop for preparser queue
 561  * \param p_obj items to preparse
 562  * \return nothing
 563  */
 564 void playlist_PreparseLoop( playlist_preparse_t *p_obj )
 565 {
 566     playlist_t *p_playlist = (playlist_t *)p_obj->p_parent;
 567     input_item_t *p_current;
 568     int i_activity;
 569
 570     vlc_object_lock( p_obj );
 571
 572     while( vlc_object_alive( p_obj ) )
 573     {
 574         if( p_obj->i_waiting == 0 )
 575         {
 576             vlc_object_wait( p_obj );
 577             continue;
 578         }
 579
 580         p_current = p_obj->pp_waiting[0];
 581         REMOVE_ELEM( p_obj->pp_waiting, p_obj->i_waiting, 0 );
 582         vlc_object_unlock( p_obj );
 583
 584         PL_LOCK;
 585         if( p_current )
 586         {
 587             if( p_current->i_type == ITEM_TYPE_FILE )
 588             {
 589                 stats_TimerStart( p_playlist, "Preparse run",
 590                                   STATS_TIMER_PREPARSE );
 591                 /* Do not preparse if it is already done (like by playing it) */
 592                 if( !input_item_IsPreparsed( p_current ) )
 593                 {
 594                     PL_UNLOCK;
 595                     input_Preparse( p_playlist, p_current );
 596                     PL_LOCK;
 597                 }
 598                 stats_TimerStop( p_playlist, STATS_TIMER_PREPARSE );
 599                 PL_UNLOCK;
 600                 input_item_SetPreparsed( p_current, true );
 601                 var_SetInteger( p_playlist, "item-change", p_current->i_id );
 602                 PL_LOCK;
 603             }
 604             /* If we haven't retrieved enough meta, add to secondary queue
 605              * which will run the "meta fetchers".
 606              * This only checks for meta, not for art
 607              * \todo don't do this for things we won't get meta for, like vids
 608              */
 609             char *psz_arturl = input_item_GetArtURL( p_current );
 610             char *psz_name = input_item_GetName( p_current );
 611             if( p_playlist->p_fetcher->i_art_policy == ALBUM_ART_ALL &&
 612                         ( !psz_arturl || strncmp( psz_arturl, "file://", 7 ) ) )
 613             {
 614                 PL_DEBUG("meta ok for %s, need to fetch art", psz_name );
 615                 vlc_object_lock( p_playlist->p_fetcher );
 616                 if( vlc_object_alive( p_playlist->p_fetcher ) )
 617                 {
 618                     INSERT_ELEM( p_playlist->p_fetcher->pp_waiting,
 619                         p_playlist->p_fetcher->i_waiting,
 620                         p_playlist->p_fetcher->i_waiting, p_current);
 621                     vlc_object_signal_unlocked( p_playlist->p_fetcher );
 622                 }
 623                 else
 624                     vlc_gc_decref( p_current );
 625                 vlc_object_unlock( p_playlist->p_fetcher );
 626             }
 627             else
 628             {
 629                 PL_DEBUG( "no fetch required for %s (art currently %s)",
 630                           psz_name, psz_arturl );
 631                 vlc_gc_decref( p_current );
 632             }
 633             free( psz_name );
 634             free( psz_arturl );
 635             PL_UNLOCK;
 636         }
 637         else
 638             PL_UNLOCK;
 639
 640         vlc_object_lock( p_obj );
 641         i_activity = var_GetInteger( p_playlist, "activity" );
 642         if( i_activity < 0 ) i_activity = 0;
 643         vlc_object_unlock( p_obj );
 644         /* Sleep at least 1ms */
 645         msleep( (i_activity+1) * 1000 );
 646         vlc_object_lock( p_obj );
 647     }
 648
 649     while( p_obj->i_waiting > 0 )
 650     {
 651         vlc_gc_decref( p_obj->pp_waiting[0] );
 652         REMOVE_ELEM( p_obj->pp_waiting, p_obj->i_waiting, 0 );
 653     }
 654
 655     vlc_object_unlock( p_obj );
 656 }
 657
 658 /**
 659  * Fetcher loop
 660  *
 661  * Main loop for secondary preparser queue
 662  * \param p_obj items to preparse
 663  * \return nothing
 664  */
 665 void playlist_FetcherLoop( playlist_fetcher_t *p_obj )
 666 {
 667     playlist_t *p_playlist = (playlist_t *)p_obj->p_parent;
 668     input_item_t *p_item;
 669     int i_activity;
 670
 671     vlc_object_lock( p_obj );
 672
 673     while( vlc_object_alive( p_obj ) )
 674     {
 675         if( p_obj->i_waiting == 0 )
 676         {
 677             vlc_object_wait( p_obj );
 678             continue;
 679         }
 680
 681         p_item = p_obj->pp_waiting[0];
 682         REMOVE_ELEM( p_obj->pp_waiting, p_obj->i_waiting, 0 );
 683         vlc_object_unlock( p_obj );
 684         if( p_item )
 685         {
 686             int i_ret;
 687
 688             /* Check if it is not yet preparsed and if so wait for it (at most 0.5s)
 689              * (This can happen if we fetch art on play)
 690              * FIXME this doesn't work if we need to fetch meta before art ... */
 691             for( i_ret = 0; i_ret < 10 && !input_item_IsPreparsed( p_item ); i_ret++ )
 692             {
 693                 bool b_break;
 694                 PL_LOCK;
 695                 b_break = ( !p_playlist->p_input || input_GetItem(p_playlist->p_input) != p_item  ||
 696                             p_playlist->p_input->b_die || p_playlist->p_input->b_eof || p_playlist->p_input->b_error );
 697                 PL_UNLOCK;
 698                 if( b_break )
 699                     break;
 700                 msleep( 50000 );
 701             }
 702
 703             i_ret = input_ArtFind( p_playlist, p_item );
 704             if( i_ret == 1 )
 705             {
 706                 PL_DEBUG( "downloading art for %s", p_item->psz_name );
 707                 if( input_DownloadAndCacheArt( p_playlist, p_item ) )
 708                     input_item_SetArtNotFound( p_item, true );
 709                 else {
 710                     input_item_SetArtFetched( p_item, true );
 711                     var_SetInteger( p_playlist, "item-change",
 712                                     p_item->i_id );
 713                 }
 714             }
 715             else if( i_ret == 0 ) /* Was in cache */
 716             {
 717                 PL_DEBUG( "found art for %s in cache", p_item->psz_name );
 718                 input_item_SetArtFetched( p_item, true );
 719                 var_SetInteger( p_playlist, "item-change", p_item->i_id );
 720             }
 721             else
 722             {
 723                 PL_DEBUG( "art not found for %s", p_item->psz_name );
 724                 input_item_SetArtNotFound( p_item, true );
 725             }
 726             vlc_gc_decref( p_item );
 727         }
 728         vlc_object_lock( p_obj );
 729         i_activity = var_GetInteger( p_playlist, "activity" );
 730         if( i_activity < 0 ) i_activity = 0;
 731         vlc_object_unlock( p_obj );
 732         /* Sleep at least 1ms */
 733         msleep( (i_activity+1) * 1000 );
 734         vlc_object_lock( p_obj );
 735     }
 736
 737     while( p_obj->i_waiting > 0 )
 738     {
 739         vlc_gc_decref( p_obj->pp_waiting[0] );
 740         REMOVE_ELEM( p_obj->pp_waiting, p_obj->i_waiting, 0 );
 741     }
 742
 743     vlc_object_unlock( p_obj );
 744 }
 745
 746 static void VariablesInit( playlist_t *p_playlist )
 747 {
 748     vlc_value_t val;
 749     /* These variables control updates */
 750     var_Create( p_playlist, "intf-change", VLC_VAR_BOOL );
 751     val.b_bool = true;
 752     var_Set( p_playlist, "intf-change", val );
 753
 754     var_Create( p_playlist, "item-change", VLC_VAR_INTEGER );
 755     val.i_int = -1;
 756     var_Set( p_playlist, "item-change", val );
 757
 758     var_Create( p_playlist, "item-deleted", VLC_VAR_INTEGER );
 759     val.i_int = -1;
 760     var_Set( p_playlist, "item-deleted", val );
 761
 762     var_Create( p_playlist, "item-append", VLC_VAR_ADDRESS );
 763
 764     var_Create( p_playlist, "playlist-current", VLC_VAR_INTEGER );
 765     val.i_int = -1;
 766     var_Set( p_playlist, "playlist-current", val );
 767
 768     var_Create( p_playlist, "activity", VLC_VAR_INTEGER );
 769     var_SetInteger( p_playlist, "activity", 0 );
 770
 771     /* Variables to control playback */
 772     var_CreateGetBool( p_playlist, "play-and-stop" );
 773     var_CreateGetBool( p_playlist, "play-and-exit" );
 774     var_CreateGetBool( p_playlist, "random" );
 775     var_CreateGetBool( p_playlist, "repeat" );
 776     var_CreateGetBool( p_playlist, "loop" );
 777
 778     var_AddCallback( p_playlist, "random", RandomCallback, NULL );
 779 }