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 /** Accessor for status item and status nodes.
 280  */
 281 playlist_item_t * get_current_status_item( playlist_t * p_playlist )
 282 {
 283     PL_ASSERT_LOCKED;
 284
 285     return p_playlist->status.p_item;
 286 }
 287
 288 playlist_item_t * get_current_status_node( playlist_t * p_playlist )
 289 {
 290     PL_ASSERT_LOCKED;
 291
 292     return p_playlist->status.p_node;
 293 }
 294
 295 void set_current_status_item( playlist_t * p_playlist,
 296     playlist_item_t * p_item )
 297 {
 298     PL_ASSERT_LOCKED;
 299
 300     if( p_playlist->status.p_item &&
 301         p_playlist->status.p_item->i_flags & PLAYLIST_REMOVE_FLAG &&
 302         p_playlist->status.p_item != p_item )
 303     {
 304          PL_DEBUG( "%s was marked for deletion, deleting",
 305                          PLI_NAME( p_playlist->status.p_item  ) );
 306          playlist_ItemDelete( p_playlist->status.p_item );
 307     }
 308     p_playlist->status.p_item = p_item;
 309 }
 310
 311 void set_current_status_node( playlist_t * p_playlist,
 312     playlist_item_t * p_node )
 313 {
 314     PL_ASSERT_LOCKED;
 315
 316     if( p_playlist->status.p_node &&
 317         p_playlist->status.p_node->i_flags & PLAYLIST_REMOVE_FLAG &&
 318         p_playlist->status.p_node != p_node )
 319     {
 320          PL_DEBUG( "%s was marked for deletion, deleting",
 321                          PLI_NAME( p_playlist->status.p_node  ) );
 322          playlist_ItemDelete( p_playlist->status.p_node );
 323     }
 324     p_playlist->status.p_node = p_node;
 325 }
 326
 327 /**
 328  * Main loop
 329  *
 330  * Main loop for the playlist
 331  * \param p_playlist the playlist object
 332  * \return nothing
 333  */
 334 void playlist_MainLoop( playlist_t *p_playlist )
 335 {
 336     playlist_item_t *p_item = NULL;
 337     bool b_playexit = var_GetBool( p_playlist, "play-and-exit" );
 338     PL_LOCK;
 339
 340     if( p_playlist->b_reset_currently_playing &&
 341         mdate() - p_playlist->last_rebuild_date > 30000 ) // 30 ms
 342     {
 343         ResetCurrentlyPlaying( p_playlist, var_GetBool( p_playlist, "random" ),
 344                                get_current_status_item( p_playlist ) );
 345         p_playlist->last_rebuild_date = mdate();
 346     }
 347
 348 check_input:
 349     /* If there is an input, check that it doesn't need to die. */
 350     if( p_playlist->p_input )
 351     {
 352         if( p_playlist->request.b_request && !p_playlist->p_input->b_die )
 353         {
 354             PL_DEBUG( "incoming request - stopping current input" );
 355             input_StopThread( p_playlist->p_input );
 356         }
 357
 358         /* This input is dead. Remove it ! */
 359         if( p_playlist->p_input->b_dead )
 360         {
 361             int i_activity;
 362             input_thread_t *p_input;
 363             sout_instance_t **pp_sout =
 364                 &libvlc_priv(p_playlist->p_libvlc)->p_sout;
 365
 366             PL_DEBUG( "dead input" );
 367
 368             p_input = p_playlist->p_input;
 369
 370             assert( *pp_sout == NULL );
 371             if( var_CreateGetBool( p_input, "sout-keep" ) )
 372                 *pp_sout = input_DetachSout( p_input );
 373
 374             /* Destroy input */
 375             playlist_release_current_input( p_playlist );
 376
 377             p_playlist->gc_date = mdate();
 378             p_playlist->b_cant_sleep = true;
 379
 380             set_current_status_item( p_playlist, NULL );
 381
 382             i_activity= var_GetInteger( p_playlist, "activity" );
 383             var_SetInteger( p_playlist, "activity", i_activity -
 384                             DEFAULT_INPUT_ACTIVITY );
 385
 386             goto check_input;
 387         }
 388         /* This input is dying, let it do */
 389         else if( p_playlist->p_input->b_die )
 390         {
 391             PL_DEBUG( "dying input" );
 392             PL_UNLOCK;
 393             msleep( INTF_IDLE_SLEEP );
 394             PL_LOCK;
 395             goto check_input;
 396         }
 397         /* This input has finished, ask it to die ! */
 398         else if( p_playlist->p_input->b_error
 399                   || p_playlist->p_input->b_eof )
 400         {
 401             PL_DEBUG( "finished input" );
 402             input_StopThread( p_playlist->p_input );
 403             /* No need to wait here, we'll wait in the p_input->b_die case */
 404             goto check_input;
 405         }
 406         else if( p_playlist->p_input->i_state != INIT_S )
 407         {
 408             PL_UNLOCK;
 409             ObjectGarbageCollector( p_playlist, false );
 410             PL_LOCK;
 411         }
 412     }
 413     else
 414     {
 415         /* No input. Several cases
 416          *  - No request, running status -> start new item
 417          *  - No request, stopped status -> collect garbage
 418          *  - Request, running requested -> start new item
 419          *  - Request, stopped requested -> collect garbage
 420         */
 421         int i_status = p_playlist->request.b_request ?
 422             p_playlist->request.i_status : p_playlist->status.i_status;
 423         if( i_status != PLAYLIST_STOPPED )
 424         {
 425             msg_Dbg( p_playlist, "starting new item" );
 426             p_item = playlist_NextItem( p_playlist );
 427
 428             if( p_item == NULL )
 429             {
 430                 msg_Dbg( p_playlist, "nothing to play" );
 431                 p_playlist->status.i_status = PLAYLIST_STOPPED;
 432                 PL_UNLOCK;
 433
 434                 if( b_playexit == true )
 435                 {
 436                     msg_Info( p_playlist, "end of playlist, exiting" );
 437                     vlc_object_kill( p_playlist->p_libvlc );
 438                 }
 439                 ObjectGarbageCollector( p_playlist, true );
 440                 return;
 441              }
 442              playlist_PlayItem( p_playlist, p_item );
 443          }
 444          else
 445          {
 446             const bool b_gc_forced = p_playlist->status.i_status != PLAYLIST_STOPPED;
 447
 448             p_playlist->status.i_status = PLAYLIST_STOPPED;
 449             set_current_status_item( p_playlist, NULL );
 450
 451             /* Collect garbage */
 452             PL_UNLOCK;
 453             ObjectGarbageCollector( p_playlist, b_gc_forced );
 454             PL_LOCK;
 455         }
 456     }
 457     PL_UNLOCK;
 458 }
 459
 460 /**
 461  * Last loop
 462  *
 463  * The playlist is dying so do the last loop
 464  * \param p_playlist the playlist object
 465  * \return nothing
 466 */
 467 void playlist_LastLoop( playlist_t *p_playlist )
 468 {
 469     /* If there is an input, kill it */
 470     while( 1 )
 471     {
 472         PL_LOCK;
 473         if( p_playlist->p_input == NULL )
 474         {
 475             PL_UNLOCK;
 476             break;
 477         }
 478
 479         if( p_playlist->p_input->b_dead )
 480         {
 481             /* remove input */
 482             playlist_release_current_input( p_playlist );
 483
 484             /* sout-keep: no need to anything here.
 485              * The last input will destroy its sout, if any, by itself */
 486
 487             PL_UNLOCK;
 488             continue;
 489         }
 490         else if( p_playlist->p_input->b_die )
 491         {
 492             /* This input is dying, leave it alone */
 493             ;
 494         }
 495         else if( p_playlist->p_input->b_error || p_playlist->p_input->b_eof )
 496         {
 497             input_StopThread( p_playlist->p_input );
 498             PL_UNLOCK;
 499             continue;
 500         }
 501         else
 502         {
 503             p_playlist->p_input->b_eof = 1;
 504         }
 505         PL_UNLOCK;
 506
 507         msleep( INTF_IDLE_SLEEP );
 508     }
 509
 510 #ifdef ENABLE_SOUT
 511     /* close the remaining sout-keep (if there was no input atm) */
 512     sout_instance_t *p_sout = libvlc_priv (p_playlist->p_libvlc)->p_sout;
 513     if (p_sout)
 514         sout_DeleteInstance( p_sout );
 515 #endif
 516
 517     /* Core should have terminated all SDs before the playlist */
 518     /* TODO: It fails to do so when not playing anything -- Courmisch */
 519     playlist_ServicesDiscoveryKillAll( p_playlist );
 520     playlist_MLDump( p_playlist );
 521
 522     vlc_object_kill( p_playlist->p_preparse );
 523     vlc_thread_join( p_playlist->p_preparse );
 524     vlc_object_kill( p_playlist->p_fetcher );
 525     vlc_thread_join( p_playlist->p_fetcher );
 526
 527     PL_LOCK;
 528
 529     /* Release the current node */
 530     set_current_status_node( p_playlist, NULL );
 531
 532     /* Release the current item */
 533     set_current_status_item( p_playlist, NULL );
 534
 535     FOREACH_ARRAY( playlist_item_t *p_del, p_playlist->all_items )
 536         free( p_del->pp_children );
 537         vlc_gc_decref( p_del->p_input );
 538         free( p_del );
 539     FOREACH_END();
 540     ARRAY_RESET( p_playlist->all_items );
 541
 542     ARRAY_RESET( p_playlist->items );
 543     ARRAY_RESET( p_playlist->current );
 544
 545     PL_UNLOCK;
 546 }
 547
 548 /**
 549  * Preparse loop
 550  *
 551  * Main loop for preparser queue
 552  * \param p_obj items to preparse
 553  * \return nothing
 554  */
 555 void playlist_PreparseLoop( playlist_preparse_t *p_obj )
 556 {
 557     playlist_t *p_playlist = (playlist_t *)p_obj->p_parent;
 558     input_item_t *p_current;
 559     int i_activity;
 560
 561     vlc_object_lock( p_obj );
 562
 563     while( vlc_object_alive( p_obj ) )
 564     {
 565         if( p_obj->i_waiting == 0 )
 566         {
 567             vlc_object_wait( p_obj );
 568             continue;
 569         }
 570
 571         p_current = p_obj->pp_waiting[0];
 572         REMOVE_ELEM( p_obj->pp_waiting, p_obj->i_waiting, 0 );
 573         vlc_object_unlock( p_obj );
 574
 575         PL_LOCK;
 576         if( p_current )
 577         {
 578             if( p_current->i_type == ITEM_TYPE_FILE )
 579             {
 580                 stats_TimerStart( p_playlist, "Preparse run",
 581                                   STATS_TIMER_PREPARSE );
 582                 /* Do not preparse if it is already done (like by playing it) */
 583                 if( !input_item_IsPreparsed( p_current ) )
 584                 {
 585                     PL_UNLOCK;
 586                     input_Preparse( p_playlist, p_current );
 587                     PL_LOCK;
 588                 }
 589                 stats_TimerStop( p_playlist, STATS_TIMER_PREPARSE );
 590                 PL_UNLOCK;
 591                 input_item_SetPreparsed( p_current, true );
 592                 var_SetInteger( p_playlist, "item-change", p_current->i_id );
 593                 PL_LOCK;
 594             }
 595             /* If we haven't retrieved enough meta, add to secondary queue
 596              * which will run the "meta fetchers".
 597              * This only checks for meta, not for art
 598              * \todo don't do this for things we won't get meta for, like vids
 599              */
 600             char *psz_arturl = input_item_GetArtURL( p_current );
 601             char *psz_name = input_item_GetName( p_current );
 602             if( p_playlist->p_fetcher->i_art_policy == ALBUM_ART_ALL &&
 603                         ( !psz_arturl || strncmp( psz_arturl, "file://", 7 ) ) )
 604             {
 605                 PL_DEBUG("meta ok for %s, need to fetch art", psz_name );
 606                 vlc_object_lock( p_playlist->p_fetcher );
 607                 if( vlc_object_alive( p_playlist->p_fetcher ) )
 608                 {
 609                     INSERT_ELEM( p_playlist->p_fetcher->pp_waiting,
 610                         p_playlist->p_fetcher->i_waiting,
 611                         p_playlist->p_fetcher->i_waiting, p_current);
 612                     vlc_object_signal_unlocked( p_playlist->p_fetcher );
 613                 }
 614                 else
 615                     vlc_gc_decref( p_current );
 616                 vlc_object_unlock( p_playlist->p_fetcher );
 617             }
 618             else
 619             {
 620                 PL_DEBUG( "no fetch required for %s (art currently %s)",
 621                           psz_name, psz_arturl );
 622                 vlc_gc_decref( p_current );
 623             }
 624             free( psz_name );
 625             free( psz_arturl );
 626             PL_UNLOCK;
 627         }
 628         else
 629             PL_UNLOCK;
 630
 631         vlc_object_lock( p_obj );
 632         i_activity = var_GetInteger( p_playlist, "activity" );
 633         if( i_activity < 0 ) i_activity = 0;
 634         vlc_object_unlock( p_obj );
 635         /* Sleep at least 1ms */
 636         msleep( (i_activity+1) * 1000 );
 637         vlc_object_lock( p_obj );
 638     }
 639
 640     while( p_obj->i_waiting > 0 )
 641     {
 642         vlc_gc_decref( p_obj->pp_waiting[0] );
 643         REMOVE_ELEM( p_obj->pp_waiting, p_obj->i_waiting, 0 );
 644     }
 645
 646     vlc_object_unlock( p_obj );
 647 }
 648
 649 /**
 650  * Fetcher loop
 651  *
 652  * Main loop for secondary preparser queue
 653  * \param p_obj items to preparse
 654  * \return nothing
 655  */
 656 void playlist_FetcherLoop( playlist_fetcher_t *p_obj )
 657 {
 658     playlist_t *p_playlist = (playlist_t *)p_obj->p_parent;
 659     input_item_t *p_item;
 660     int i_activity;
 661
 662     vlc_object_lock( p_obj );
 663
 664     while( vlc_object_alive( p_obj ) )
 665     {
 666         if( p_obj->i_waiting == 0 )
 667         {
 668             vlc_object_wait( p_obj );
 669             continue;
 670         }
 671
 672         p_item = p_obj->pp_waiting[0];
 673         REMOVE_ELEM( p_obj->pp_waiting, p_obj->i_waiting, 0 );
 674         vlc_object_unlock( p_obj );
 675         if( p_item )
 676         {
 677             int i_ret;
 678
 679             /* Check if it is not yet preparsed and if so wait for it (at most 0.5s)
 680              * (This can happen if we fetch art on play)
 681              * FIXME this doesn't work if we need to fetch meta before art ... */
 682             for( i_ret = 0; i_ret < 10 && !input_item_IsPreparsed( p_item ); i_ret++ )
 683             {
 684                 bool b_break;
 685                 PL_LOCK;
 686                 b_break = ( !p_playlist->p_input || input_GetItem(p_playlist->p_input) != p_item  ||
 687                             p_playlist->p_input->b_die || p_playlist->p_input->b_eof || p_playlist->p_input->b_error );
 688                 PL_UNLOCK;
 689                 if( b_break )
 690                     break;
 691                 msleep( 50000 );
 692             }
 693
 694             i_ret = input_ArtFind( p_playlist, p_item );
 695             if( i_ret == 1 )
 696             {
 697                 PL_DEBUG( "downloading art for %s", p_item->psz_name );
 698                 if( input_DownloadAndCacheArt( p_playlist, p_item ) )
 699                     input_item_SetArtNotFound( p_item, true );
 700                 else {
 701                     input_item_SetArtFetched( p_item, true );
 702                     var_SetInteger( p_playlist, "item-change",
 703                                     p_item->i_id );
 704                 }
 705             }
 706             else if( i_ret == 0 ) /* Was in cache */
 707             {
 708                 PL_DEBUG( "found art for %s in cache", p_item->psz_name );
 709                 input_item_SetArtFetched( p_item, true );
 710                 var_SetInteger( p_playlist, "item-change", p_item->i_id );
 711             }
 712             else
 713             {
 714                 PL_DEBUG( "art not found for %s", p_item->psz_name );
 715                 input_item_SetArtNotFound( p_item, true );
 716             }
 717             vlc_gc_decref( p_item );
 718         }
 719         vlc_object_lock( p_obj );
 720         i_activity = var_GetInteger( p_playlist, "activity" );
 721         if( i_activity < 0 ) i_activity = 0;
 722         vlc_object_unlock( p_obj );
 723         /* Sleep at least 1ms */
 724         msleep( (i_activity+1) * 1000 );
 725         vlc_object_lock( p_obj );
 726     }
 727
 728     while( p_obj->i_waiting > 0 )
 729     {
 730         vlc_gc_decref( p_obj->pp_waiting[0] );
 731         REMOVE_ELEM( p_obj->pp_waiting, p_obj->i_waiting, 0 );
 732     }
 733
 734     vlc_object_unlock( p_obj );
 735 }
 736
 737 static void VariablesInit( playlist_t *p_playlist )
 738 {
 739     vlc_value_t val;
 740     /* These variables control updates */
 741     var_Create( p_playlist, "intf-change", VLC_VAR_BOOL );
 742     val.b_bool = true;
 743     var_Set( p_playlist, "intf-change", val );
 744
 745     var_Create( p_playlist, "item-change", VLC_VAR_INTEGER );
 746     val.i_int = -1;
 747     var_Set( p_playlist, "item-change", val );
 748
 749     var_Create( p_playlist, "item-deleted", VLC_VAR_INTEGER );
 750     val.i_int = -1;
 751     var_Set( p_playlist, "item-deleted", val );
 752
 753     var_Create( p_playlist, "item-append", VLC_VAR_ADDRESS );
 754
 755     var_Create( p_playlist, "playlist-current", VLC_VAR_INTEGER );
 756     val.i_int = -1;
 757     var_Set( p_playlist, "playlist-current", val );
 758
 759     var_Create( p_playlist, "activity", VLC_VAR_INTEGER );
 760     var_SetInteger( p_playlist, "activity", 0 );
 761
 762     /* Variables to control playback */
 763     var_CreateGetBool( p_playlist, "play-and-stop" );
 764     var_CreateGetBool( p_playlist, "play-and-exit" );
 765     var_CreateGetBool( p_playlist, "random" );
 766     var_CreateGetBool( p_playlist, "repeat" );
 767     var_CreateGetBool( p_playlist, "loop" );
 768
 769     var_AddCallback( p_playlist, "random", RandomCallback, NULL );
 770 }