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     PL_ASSERT_LOCKED;
 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     PL_ASSERT_LOCKED;
 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 /** Accessor for status item and status nodes.
 281  */
 282 playlist_item_t * get_current_status_item( playlist_t * p_playlist )
 283 {
 284     PL_ASSERT_LOCKED;
 285
 286     return p_playlist->status.p_item;
 287 }
 288
 289 playlist_item_t * get_current_status_node( playlist_t * p_playlist )
 290 {
 291     PL_ASSERT_LOCKED;
 292
 293     return p_playlist->status.p_node;
 294 }
 295
 296 void set_current_status_item( playlist_t * p_playlist,
 297     playlist_item_t * p_item )
 298 {
 299     PL_ASSERT_LOCKED;
 300
 301     if( p_playlist->status.p_item &&
 302         p_playlist->status.p_item->i_flags & PLAYLIST_REMOVE_FLAG &&
 303         p_playlist->status.p_item != p_item )
 304     {
 305          PL_DEBUG( "%s was marked for deletion, deleting",
 306                          PLI_NAME( p_playlist->status.p_item  ) );
 307          playlist_ItemDelete( p_playlist->status.p_item );
 308     }
 309     p_playlist->status.p_item = p_item;
 310 }
 311
 312 void set_current_status_node( playlist_t * p_playlist,
 313     playlist_item_t * p_node )
 314 {
 315     PL_ASSERT_LOCKED;
 316
 317     if( p_playlist->status.p_node &&
 318         p_playlist->status.p_node->i_flags & PLAYLIST_REMOVE_FLAG &&
 319         p_playlist->status.p_node != p_node )
 320     {
 321          PL_DEBUG( "%s was marked for deletion, deleting",
 322                          PLI_NAME( p_playlist->status.p_node  ) );
 323          playlist_ItemDelete( p_playlist->status.p_node );
 324     }
 325     p_playlist->status.p_node = p_node;
 326 }
 327
 328 /**
 329  * Main loop
 330  *
 331  * Main loop for the playlist
 332  * \param p_playlist the playlist object
 333  * \return nothing
 334  */
 335 void playlist_MainLoop( playlist_t *p_playlist )
 336 {
 337     playlist_item_t *p_item = NULL;
 338     bool b_playexit = var_GetBool( p_playlist, "play-and-exit" );
 339     PL_LOCK;
 340
 341     if( p_playlist->b_reset_currently_playing &&
 342         mdate() - p_playlist->last_rebuild_date > 30000 ) // 30 ms
 343     {
 344         ResetCurrentlyPlaying( p_playlist, var_GetBool( p_playlist, "random" ),
 345                                get_current_status_item( p_playlist ) );
 346         p_playlist->last_rebuild_date = mdate();
 347     }
 348
 349 check_input:
 350     /* If there is an input, check that it doesn't need to die. */
 351     if( p_playlist->p_input )
 352     {
 353         if( p_playlist->request.b_request && !p_playlist->p_input->b_die )
 354         {
 355             PL_DEBUG( "incoming request - stopping current input" );
 356             input_StopThread( p_playlist->p_input );
 357         }
 358
 359         /* This input is dead. Remove it ! */
 360         if( p_playlist->p_input->b_dead )
 361         {
 362             int i_activity;
 363             input_thread_t *p_input;
 364             sout_instance_t **pp_sout =
 365                 &libvlc_priv(p_playlist->p_libvlc)->p_sout;
 366
 367             PL_DEBUG( "dead input" );
 368
 369             p_input = p_playlist->p_input;
 370
 371             assert( *pp_sout == NULL );
 372             if( var_CreateGetBool( p_input, "sout-keep" ) )
 373                 *pp_sout = input_DetachSout( p_input );
 374
 375             /* Destroy input */
 376             playlist_release_current_input( p_playlist );
 377
 378             p_playlist->gc_date = mdate();
 379             p_playlist->b_cant_sleep = true;
 380
 381             set_current_status_item( p_playlist, NULL );
 382
 383             i_activity= var_GetInteger( p_playlist, "activity" );
 384             var_SetInteger( p_playlist, "activity", i_activity -
 385                             DEFAULT_INPUT_ACTIVITY );
 386
 387             goto check_input;
 388         }
 389         /* This input is dying, let it do */
 390         else if( p_playlist->p_input->b_die )
 391         {
 392             PL_DEBUG( "dying input" );
 393             PL_UNLOCK;
 394             msleep( INTF_IDLE_SLEEP );
 395             PL_LOCK;
 396             goto check_input;
 397         }
 398         /* This input has finished, ask it to die ! */
 399         else if( p_playlist->p_input->b_error
 400                   || p_playlist->p_input->b_eof )
 401         {
 402             PL_DEBUG( "finished input" );
 403             input_StopThread( p_playlist->p_input );
 404             /* No need to wait here, we'll wait in the p_input->b_die case */
 405             goto check_input;
 406         }
 407         else if( p_playlist->p_input->i_state != INIT_S )
 408         {
 409             PL_UNLOCK;
 410             ObjectGarbageCollector( p_playlist, false );
 411             PL_LOCK;
 412         }
 413     }
 414     else
 415     {
 416         /* No input. Several cases
 417          *  - No request, running status -> start new item
 418          *  - No request, stopped status -> collect garbage
 419          *  - Request, running requested -> start new item
 420          *  - Request, stopped requested -> collect garbage
 421         */
 422         int i_status = p_playlist->request.b_request ?
 423             p_playlist->request.i_status : p_playlist->status.i_status;
 424         if( i_status != PLAYLIST_STOPPED )
 425         {
 426             msg_Dbg( p_playlist, "starting new item" );
 427             p_item = playlist_NextItem( p_playlist );
 428
 429             if( p_item == NULL )
 430             {
 431                 msg_Dbg( p_playlist, "nothing to play" );
 432                 p_playlist->status.i_status = PLAYLIST_STOPPED;
 433                 PL_UNLOCK;
 434
 435                 if( b_playexit == true )
 436                 {
 437                     msg_Info( p_playlist, "end of playlist, exiting" );
 438                     vlc_object_kill( p_playlist->p_libvlc );
 439                 }
 440                 ObjectGarbageCollector( p_playlist, true );
 441                 return;
 442              }
 443              playlist_PlayItem( p_playlist, p_item );
 444          }
 445          else
 446          {
 447             const bool b_gc_forced = p_playlist->status.i_status != PLAYLIST_STOPPED;
 448
 449             p_playlist->status.i_status = PLAYLIST_STOPPED;
 450             set_current_status_item( p_playlist, NULL );
 451
 452             /* Collect garbage */
 453             PL_UNLOCK;
 454             ObjectGarbageCollector( p_playlist, b_gc_forced );
 455             PL_LOCK;
 456         }
 457     }
 458     PL_UNLOCK;
 459 }
 460
 461 /**
 462  * Last loop
 463  *
 464  * The playlist is dying so do the last loop
 465  * \param p_playlist the playlist object
 466  * \return nothing
 467 */
 468 void playlist_LastLoop( playlist_t *p_playlist )
 469 {
 470     /* If there is an input, kill it */
 471     while( 1 )
 472     {
 473         PL_LOCK;
 474         if( p_playlist->p_input == NULL )
 475         {
 476             PL_UNLOCK;
 477             break;
 478         }
 479
 480         if( p_playlist->p_input->b_dead )
 481         {
 482             /* remove input */
 483             playlist_release_current_input( p_playlist );
 484
 485             /* sout-keep: no need to anything here.
 486              * The last input will destroy its sout, if any, by itself */
 487
 488             PL_UNLOCK;
 489             continue;
 490         }
 491         else if( p_playlist->p_input->b_die )
 492         {
 493             /* This input is dying, leave it alone */
 494             ;
 495         }
 496         else if( p_playlist->p_input->b_error || p_playlist->p_input->b_eof )
 497         {
 498             input_StopThread( p_playlist->p_input );
 499             PL_UNLOCK;
 500             continue;
 501         }
 502         else
 503         {
 504             p_playlist->p_input->b_eof = 1;
 505         }
 506         PL_UNLOCK;
 507
 508         msleep( INTF_IDLE_SLEEP );
 509     }
 510
 511 #ifdef ENABLE_SOUT
 512     /* close the remaining sout-keep (if there was no input atm) */
 513     sout_instance_t *p_sout = libvlc_priv (p_playlist->p_libvlc)->p_sout;
 514     if (p_sout)
 515         sout_DeleteInstance( p_sout );
 516 #endif
 517
 518     /* Core should have terminated all SDs before the playlist */
 519     /* TODO: It fails to do so when not playing anything -- Courmisch */
 520     playlist_ServicesDiscoveryKillAll( p_playlist );
 521     playlist_MLDump( p_playlist );
 522
 523     vlc_object_kill( p_playlist->p_preparse );
 524     vlc_thread_join( p_playlist->p_preparse );
 525     vlc_object_kill( p_playlist->p_fetcher );
 526     vlc_thread_join( p_playlist->p_fetcher );
 527
 528     PL_LOCK;
 529
 530     /* Release the current node */
 531     set_current_status_node( p_playlist, NULL );
 532
 533     /* Release the current item */
 534     set_current_status_item( p_playlist, NULL );
 535
 536     FOREACH_ARRAY( playlist_item_t *p_del, p_playlist->all_items )
 537         free( p_del->pp_children );
 538         vlc_gc_decref( p_del->p_input );
 539         free( p_del );
 540     FOREACH_END();
 541     ARRAY_RESET( p_playlist->all_items );
 542
 543     ARRAY_RESET( p_playlist->items );
 544     ARRAY_RESET( p_playlist->current );
 545
 546     PL_UNLOCK;
 547 }
 548
 549 /**
 550  * Preparse loop
 551  *
 552  * Main loop for preparser queue
 553  * \param p_obj items to preparse
 554  * \return nothing
 555  */
 556 void playlist_PreparseLoop( playlist_preparse_t *p_obj )
 557 {
 558     playlist_t *p_playlist = (playlist_t *)p_obj->p_parent;
 559     input_item_t *p_current;
 560     int i_activity;
 561
 562     vlc_object_lock( p_obj );
 563
 564     while( vlc_object_alive( p_obj ) )
 565     {
 566         if( p_obj->i_waiting == 0 )
 567         {
 568             vlc_object_wait( p_obj );
 569             continue;
 570         }
 571
 572         p_current = p_obj->pp_waiting[0];
 573         REMOVE_ELEM( p_obj->pp_waiting, p_obj->i_waiting, 0 );
 574         vlc_object_unlock( p_obj );
 575
 576         PL_LOCK;
 577         if( p_current )
 578         {
 579             if( p_current->i_type == ITEM_TYPE_FILE )
 580             {
 581                 stats_TimerStart( p_playlist, "Preparse run",
 582                                   STATS_TIMER_PREPARSE );
 583                 /* Do not preparse if it is already done (like by playing it) */
 584                 if( !input_item_IsPreparsed( p_current ) )
 585                 {
 586                     PL_UNLOCK;
 587                     input_Preparse( p_playlist, p_current );
 588                     PL_LOCK;
 589                 }
 590                 stats_TimerStop( p_playlist, STATS_TIMER_PREPARSE );
 591                 PL_UNLOCK;
 592                 input_item_SetPreparsed( p_current, true );
 593                 var_SetInteger( p_playlist, "item-change", p_current->i_id );
 594                 PL_LOCK;
 595             }
 596             /* If we haven't retrieved enough meta, add to secondary queue
 597              * which will run the "meta fetchers".
 598              * This only checks for meta, not for art
 599              * \todo don't do this for things we won't get meta for, like vids
 600              */
 601             char *psz_arturl = input_item_GetArtURL( p_current );
 602             char *psz_name = input_item_GetName( p_current );
 603             if( p_playlist->p_fetcher->i_art_policy == ALBUM_ART_ALL &&
 604                         ( !psz_arturl || strncmp( psz_arturl, "file://", 7 ) ) )
 605             {
 606                 PL_DEBUG("meta ok for %s, need to fetch art", psz_name );
 607                 vlc_object_lock( p_playlist->p_fetcher );
 608                 if( vlc_object_alive( p_playlist->p_fetcher ) )
 609                 {
 610                     INSERT_ELEM( p_playlist->p_fetcher->pp_waiting,
 611                         p_playlist->p_fetcher->i_waiting,
 612                         p_playlist->p_fetcher->i_waiting, p_current);
 613                     vlc_object_signal_unlocked( p_playlist->p_fetcher );
 614                 }
 615                 else
 616                     vlc_gc_decref( p_current );
 617                 vlc_object_unlock( p_playlist->p_fetcher );
 618             }
 619             else
 620             {
 621                 PL_DEBUG( "no fetch required for %s (art currently %s)",
 622                           psz_name, psz_arturl );
 623                 vlc_gc_decref( p_current );
 624             }
 625             free( psz_name );
 626             free( psz_arturl );
 627             PL_UNLOCK;
 628         }
 629         else
 630             PL_UNLOCK;
 631
 632         vlc_object_lock( p_obj );
 633         i_activity = var_GetInteger( p_playlist, "activity" );
 634         if( i_activity < 0 ) i_activity = 0;
 635         vlc_object_unlock( p_obj );
 636         /* Sleep at least 1ms */
 637         msleep( (i_activity+1) * 1000 );
 638         vlc_object_lock( p_obj );
 639     }
 640
 641     while( p_obj->i_waiting > 0 )
 642     {
 643         vlc_gc_decref( p_obj->pp_waiting[0] );
 644         REMOVE_ELEM( p_obj->pp_waiting, p_obj->i_waiting, 0 );
 645     }
 646
 647     vlc_object_unlock( p_obj );
 648 }
 649
 650 /**
 651  * Fetcher loop
 652  *
 653  * Main loop for secondary preparser queue
 654  * \param p_obj items to preparse
 655  * \return nothing
 656  */
 657 void playlist_FetcherLoop( playlist_fetcher_t *p_obj )
 658 {
 659     playlist_t *p_playlist = (playlist_t *)p_obj->p_parent;
 660     input_item_t *p_item;
 661     int i_activity;
 662
 663     vlc_object_lock( p_obj );
 664
 665     while( vlc_object_alive( p_obj ) )
 666     {
 667         if( p_obj->i_waiting == 0 )
 668         {
 669             vlc_object_wait( p_obj );
 670             continue;
 671         }
 672
 673         p_item = p_obj->pp_waiting[0];
 674         REMOVE_ELEM( p_obj->pp_waiting, p_obj->i_waiting, 0 );
 675         vlc_object_unlock( p_obj );
 676         if( p_item )
 677         {
 678             int i_ret;
 679
 680             /* Check if it is not yet preparsed and if so wait for it (at most 0.5s)
 681              * (This can happen if we fetch art on play)
 682              * FIXME this doesn't work if we need to fetch meta before art ... */
 683             for( i_ret = 0; i_ret < 10 && !input_item_IsPreparsed( p_item ); i_ret++ )
 684             {
 685                 bool b_break;
 686                 PL_LOCK;
 687                 b_break = ( !p_playlist->p_input || input_GetItem(p_playlist->p_input) != p_item  ||
 688                             p_playlist->p_input->b_die || p_playlist->p_input->b_eof || p_playlist->p_input->b_error );
 689                 PL_UNLOCK;
 690                 if( b_break )
 691                     break;
 692                 msleep( 50000 );
 693             }
 694
 695             i_ret = input_ArtFind( p_playlist, p_item );
 696             if( i_ret == 1 )
 697             {
 698                 PL_DEBUG( "downloading art for %s", p_item->psz_name );
 699                 if( input_DownloadAndCacheArt( p_playlist, p_item ) )
 700                     input_item_SetArtNotFound( p_item, true );
 701                 else {
 702                     input_item_SetArtFetched( p_item, true );
 703                     var_SetInteger( p_playlist, "item-change",
 704                                     p_item->i_id );
 705                 }
 706             }
 707             else if( i_ret == 0 ) /* Was in cache */
 708             {
 709                 PL_DEBUG( "found art for %s in cache", p_item->psz_name );
 710                 input_item_SetArtFetched( p_item, true );
 711                 var_SetInteger( p_playlist, "item-change", p_item->i_id );
 712             }
 713             else
 714             {
 715                 PL_DEBUG( "art not found for %s", p_item->psz_name );
 716                 input_item_SetArtNotFound( p_item, true );
 717             }
 718             vlc_gc_decref( p_item );
 719         }
 720         vlc_object_lock( p_obj );
 721         i_activity = var_GetInteger( p_playlist, "activity" );
 722         if( i_activity < 0 ) i_activity = 0;
 723         vlc_object_unlock( p_obj );
 724         /* Sleep at least 1ms */
 725         msleep( (i_activity+1) * 1000 );
 726         vlc_object_lock( p_obj );
 727     }
 728
 729     while( p_obj->i_waiting > 0 )
 730     {
 731         vlc_gc_decref( p_obj->pp_waiting[0] );
 732         REMOVE_ELEM( p_obj->pp_waiting, p_obj->i_waiting, 0 );
 733     }
 734
 735     vlc_object_unlock( p_obj );
 736 }
 737
 738 static void VariablesInit( playlist_t *p_playlist )
 739 {
 740     vlc_value_t val;
 741     /* These variables control updates */
 742     var_Create( p_playlist, "intf-change", VLC_VAR_BOOL );
 743     val.b_bool = true;
 744     var_Set( p_playlist, "intf-change", val );
 745
 746     var_Create( p_playlist, "item-change", VLC_VAR_INTEGER );
 747     val.i_int = -1;
 748     var_Set( p_playlist, "item-change", val );
 749
 750     var_Create( p_playlist, "item-deleted", VLC_VAR_INTEGER );
 751     val.i_int = -1;
 752     var_Set( p_playlist, "item-deleted", val );
 753
 754     var_Create( p_playlist, "item-append", VLC_VAR_ADDRESS );
 755
 756     var_Create( p_playlist, "playlist-current", VLC_VAR_INTEGER );
 757     val.i_int = -1;
 758     var_Set( p_playlist, "playlist-current", val );
 759
 760     var_Create( p_playlist, "activity", VLC_VAR_INTEGER );
 761     var_SetInteger( p_playlist, "activity", 0 );
 762
 763     /* Variables to control playback */
 764     var_CreateGetBool( p_playlist, "play-and-stop" );
 765     var_CreateGetBool( p_playlist, "play-and-exit" );
 766     var_CreateGetBool( p_playlist, "random" );
 767     var_CreateGetBool( p_playlist, "repeat" );
 768     var_CreateGetBool( p_playlist, "loop" );
 769
 770     var_AddCallback( p_playlist, "random", RandomCallback, NULL );
 771 }