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