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