097dd0e688f2081c1f89657ee81459101713e61b
[vlc.git] / src / playlist / engine.c
1 /*****************************************************************************
2  * engine.c : Run the playlist and handle its control
3  *****************************************************************************
4  * Copyright (C) 1999-2007 the VideoLAN team
5  * $Id$
6  *
7  * Authors: Samuel Hocevar <sam@zoy.org>
8  *          ClĂ©ment Stenac <zorglub@videolan.org>
9  *
10  * This program is free software; you can redistribute it and/or modify
11  * it under the terms of the GNU General Public License as published by
12  * the Free Software Foundation; either version 2 of the License, or
13  * (at your option) any later version.
14  *
15  * This program is distributed in the hope that it will be useful,
16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
18  * GNU General Public License for more details.
19  *
20  * You should have received a copy of the GNU General Public License
21  * along with this program; if not, write to the Free Software
22  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
23  *****************************************************************************/
24
25 #include <vlc/vlc.h>
26 #include <vlc_vout.h>
27 #include <vlc_sout.h>
28 #include <vlc_playlist.h>
29 #include <vlc_interface.h>
30 #include "playlist_internal.h"
31 #include "stream_output/stream_output.h" /* sout_DeleteInstance */
32
33 /*****************************************************************************
34  * Local prototypes
35  *****************************************************************************/
36 static void VariablesInit( playlist_t *p_playlist );
37
38 static int RandomCallback( vlc_object_t *p_this, char const *psz_cmd,
39                            vlc_value_t oldval, vlc_value_t newval, void *a )
40 {
41     (void)psz_cmd; (void)oldval; (void)newval; (void)a;
42
43     ((playlist_t*)p_this)->b_reset_currently_playing = VLC_TRUE;
44     playlist_Signal( ((playlist_t*)p_this) );
45     return VLC_SUCCESS;
46 }
47
48 /**
49  * Create playlist
50  *
51  * Create a playlist structure.
52  * \param p_parent the vlc object that is to be the parent of this playlist
53  * \return a pointer to the created playlist, or NULL on error
54  */
55 playlist_t * playlist_Create( vlc_object_t *p_parent )
56 {
57     playlist_t *p_playlist;
58     vlc_bool_t b_save;
59     int i_tree;
60
61     /* Allocate structure */
62     p_playlist = vlc_object_create( p_parent, VLC_OBJECT_PLAYLIST );
63     if( !p_playlist )
64     {
65         msg_Err( p_parent, "out of memory" );
66         return NULL;
67     }
68
69     TAB_INIT( p_playlist->i_sds, p_playlist->pp_sds );
70
71     p_parent->p_libvlc->p_playlist = p_playlist;
72
73     VariablesInit( p_playlist );
74
75     /* Initialise data structures */
76     vlc_mutex_init( p_playlist, &p_playlist->gc_lock );
77     p_playlist->i_last_playlist_id = 0;
78     p_playlist->i_last_input_id = 0;
79     p_playlist->p_input = NULL;
80
81     p_playlist->gc_date = 0;
82     p_playlist->b_cant_sleep = VLC_FALSE;
83
84     ARRAY_INIT( p_playlist->items );
85     ARRAY_INIT( p_playlist->all_items );
86     ARRAY_INIT( p_playlist->input_items );
87     ARRAY_INIT( p_playlist->current );
88
89     p_playlist->i_current_index = 0;
90     p_playlist->b_reset_currently_playing = VLC_TRUE;
91     p_playlist->last_rebuild_date = 0;
92
93     i_tree = var_CreateGetBool( p_playlist, "playlist-tree" );
94     p_playlist->b_always_tree = (i_tree == 1);
95     p_playlist->b_never_tree = (i_tree == 2);
96
97     p_playlist->b_doing_ml = VLC_FALSE;
98
99     p_playlist->b_auto_preparse =
100                         var_CreateGetBool( p_playlist, "auto-preparse") ;
101
102     p_playlist->p_root_category = playlist_NodeCreate( p_playlist, NULL, NULL,
103                                                        0 );
104     p_playlist->p_root_onelevel = playlist_NodeCreate( p_playlist, NULL, NULL,
105                                                        0 );
106
107     if( !p_playlist->p_root_category || !p_playlist->p_root_onelevel )
108         return NULL;
109
110     /* Create playlist and media library */
111     p_playlist->p_local_category = playlist_NodeCreate( p_playlist,
112                               _( "Playlist" ),p_playlist->p_root_category, 0 );
113     p_playlist->p_local_onelevel =  playlist_NodeCreate( p_playlist,
114                               _( "Playlist" ), p_playlist->p_root_onelevel, 0 );
115     p_playlist->p_local_category->i_flags |= PLAYLIST_RO_FLAG;
116     p_playlist->p_local_onelevel->i_flags |= PLAYLIST_RO_FLAG;
117
118     if( !p_playlist->p_local_category || !p_playlist->p_local_onelevel ||
119         !p_playlist->p_local_category->p_input ||
120         !p_playlist->p_local_onelevel->p_input )
121         return NULL;
122
123     /* Link the nodes together. Todo: actually create them from the same input*/
124     p_playlist->p_local_onelevel->p_input->i_id =
125         p_playlist->p_local_category->p_input->i_id;
126
127     if( config_GetInt( p_playlist, "media-library") )
128     {
129         p_playlist->p_ml_category =   playlist_NodeCreate( p_playlist,
130                          _( "Media Library" ), p_playlist->p_root_category, 0 );
131         p_playlist->p_ml_onelevel =  playlist_NodeCreate( p_playlist,
132                          _( "Media Library" ), p_playlist->p_root_onelevel, 0 );
133
134         if(!p_playlist->p_ml_category || !p_playlist->p_ml_onelevel)
135             return NULL;
136
137         p_playlist->p_ml_category->i_flags |= PLAYLIST_RO_FLAG;
138         p_playlist->p_ml_onelevel->i_flags |= PLAYLIST_RO_FLAG;
139         p_playlist->p_ml_onelevel->p_input->i_id =
140              p_playlist->p_ml_category->p_input->i_id;
141
142     }
143     else
144     {
145         p_playlist->p_ml_category = p_playlist->p_ml_onelevel = NULL;
146     }
147
148     /* Initial status */
149     p_playlist->status.p_item = NULL;
150     p_playlist->status.p_node = p_playlist->p_local_onelevel;
151     p_playlist->request.b_request = VLC_FALSE;
152     p_playlist->status.i_status = PLAYLIST_STOPPED;
153
154     p_playlist->i_sort = SORT_ID;
155     p_playlist->i_order = ORDER_NORMAL;
156
157     b_save = p_playlist->b_auto_preparse;
158     p_playlist->b_auto_preparse = VLC_FALSE;
159     playlist_MLLoad( p_playlist );
160     p_playlist->b_auto_preparse = VLC_TRUE;
161     return p_playlist;
162 }
163
164 void playlist_Destroy( playlist_t *p_playlist )
165 {
166     var_Destroy( p_playlist, "intf-change" );
167     var_Destroy( p_playlist, "item-change" );
168     var_Destroy( p_playlist, "playlist-current" );
169     var_Destroy( p_playlist, "intf-popmenu" );
170     var_Destroy( p_playlist, "intf-show" );
171     var_Destroy( p_playlist, "play-and-stop" );
172     var_Destroy( p_playlist, "play-and-exit" );
173     var_Destroy( p_playlist, "random" );
174     var_Destroy( p_playlist, "repeat" );
175     var_Destroy( p_playlist, "loop" );
176     var_Destroy( p_playlist, "activity" );
177
178     vlc_mutex_destroy( &p_playlist->gc_lock );
179     vlc_object_detach( p_playlist );
180     vlc_object_destroy( p_playlist );
181 }
182
183 /* Destroy remaining objects */
184 static void ObjectGarbageCollector( playlist_t *p_playlist, vlc_bool_t b_force )
185 {
186     vlc_object_t *p_obj;
187
188     if( !b_force )
189     {
190         if( mdate() - p_playlist->gc_date < 1000000 )
191         {
192             p_playlist->b_cant_sleep = VLC_TRUE;
193             return;
194         }
195         else if( p_playlist->gc_date == 0 )
196             return;
197     }
198
199     vlc_mutex_lock( &p_playlist->gc_lock );
200     while( ( p_obj = vlc_object_find( p_playlist, VLC_OBJECT_VOUT,
201                                                   FIND_CHILD ) ) )
202     {
203         if( p_obj->p_parent != VLC_OBJECT(p_playlist) )
204         {
205             vlc_object_release( p_obj );
206             break;
207         }
208         msg_Dbg( p_playlist, "garbage collector destroying 1 vout" );
209         vlc_object_detach( p_obj );
210         vlc_object_release( p_obj );
211         vout_Destroy( (vout_thread_t *)p_obj );
212     }
213     while( ( p_obj = vlc_object_find( p_playlist, VLC_OBJECT_SOUT,
214                                                   FIND_CHILD ) ) )
215     {
216         if( p_obj->p_parent != VLC_OBJECT(p_playlist) )
217         {
218             vlc_object_release( p_obj );
219             break;
220         }
221         msg_Dbg( p_playlist, "garbage collector destroying 1 sout" );
222         vlc_object_detach( p_obj );
223         vlc_object_release( p_obj );
224         sout_DeleteInstance( (sout_instance_t*)p_obj );
225     }
226     p_playlist->b_cant_sleep = VLC_FALSE;
227     vlc_mutex_unlock( &p_playlist->gc_lock );
228 }
229
230 /** Main loop for the playlist */
231 void playlist_MainLoop( playlist_t *p_playlist )
232 {
233     playlist_item_t *p_item = NULL;
234     vlc_bool_t b_playexit = var_GetBool( p_playlist, "play-and-exit" );
235     PL_LOCK;
236
237     if( p_playlist->b_reset_currently_playing &&
238         mdate() - p_playlist->last_rebuild_date > 30000 ) // 30 ms
239     {
240         ResetCurrentlyPlaying( p_playlist, var_GetBool( p_playlist, "random"),
241                              p_playlist->status.p_item );
242         p_playlist->last_rebuild_date = mdate();
243     }
244
245 check_input:
246     /* If there is an input, check that it doesn't need to die. */
247     if( p_playlist->p_input )
248     {
249         if( p_playlist->request.b_request && !p_playlist->p_input->b_die )
250         {
251             PL_DEBUG( "incoming request - stopping current input" );
252             input_StopThread( p_playlist->p_input );
253         }
254
255         /* This input is dead. Remove it ! */
256         if( p_playlist->p_input->b_dead )
257         {
258             int i_activity;
259             input_thread_t *p_input;
260             PL_DEBUG( "dead input" );
261
262             p_input = p_playlist->p_input;
263             p_playlist->p_input = NULL;
264
265             /* Release the playlist lock, because we may get stuck
266              * in input_DestroyThread() for some time. */
267             PL_UNLOCK
268
269             /* Destroy input */
270             input_DestroyThread( p_input );
271
272             PL_LOCK;
273
274             p_playlist->gc_date = mdate();
275             p_playlist->b_cant_sleep = VLC_TRUE;
276
277             if( p_playlist->status.p_item->i_flags
278                 & PLAYLIST_REMOVE_FLAG )
279             {
280                  PL_DEBUG( "%s was marked for deletion, deleting",
281                                  PLI_NAME( p_playlist->status.p_item  ) );
282                  playlist_ItemDelete( p_playlist->status.p_item );
283                  if( p_playlist->request.p_item == p_playlist->status.p_item )
284                      p_playlist->request.p_item = NULL;
285                  p_playlist->status.p_item = NULL;
286             }
287
288             i_activity= var_GetInteger( p_playlist, "activity") ;
289             var_SetInteger( p_playlist, "activity", i_activity -
290                             DEFAULT_INPUT_ACTIVITY );
291             goto check_input;
292         }
293         /* This input is dying, let it do */
294         else if( p_playlist->p_input->b_die )
295         {
296             PL_DEBUG( "dying input" );
297             PL_UNLOCK;
298             msleep( 25000 ); // 25 ms
299             PL_LOCK;
300             goto check_input;
301         }
302         /* This input has finished, ask it to die ! */
303         else if( p_playlist->p_input->b_error
304                   || p_playlist->p_input->b_eof )
305         {
306             PL_DEBUG( "finished input" );
307             input_StopThread( p_playlist->p_input );
308             /* No need to wait here, we'll wait in the p_input->b_die case */
309             goto check_input;
310         }
311         else if( p_playlist->p_input->i_state != INIT_S )
312         {
313             PL_UNLOCK;
314             ObjectGarbageCollector( p_playlist, VLC_FALSE );
315             PL_LOCK;
316         }
317     }
318     else
319     {
320         /* No input. Several cases
321          *  - No request, running status -> start new item
322          *  - No request, stopped status -> collect garbage
323          *  - Request, running requested -> start new item
324          *  - Request, stopped requested -> collect garbage
325          */
326          if( (!p_playlist->request.b_request &&
327               p_playlist->status.i_status != PLAYLIST_STOPPED) ||
328               ( p_playlist->request.b_request &&
329                 p_playlist->request.i_status != PLAYLIST_STOPPED ) )
330          {
331              msg_Dbg( p_playlist, "starting new item" );
332              p_item = playlist_NextItem( p_playlist );
333
334              if( p_item == NULL )
335              {
336                 msg_Dbg( p_playlist, "nothing to play" );
337                 p_playlist->status.i_status = PLAYLIST_STOPPED;
338                 PL_UNLOCK
339
340                 if( b_playexit == VLC_TRUE )
341                 {
342                     msg_Info( p_playlist, "end of playlist, exiting" );
343                     vlc_object_kill( p_playlist->p_libvlc );
344                 }
345                 ObjectGarbageCollector( p_playlist, VLC_TRUE );
346                 return;
347              }
348              playlist_PlayItem( p_playlist, p_item );
349          }
350          else
351          {
352             const vlc_bool_t b_gc_forced = p_playlist->status.i_status != PLAYLIST_STOPPED;
353
354             p_playlist->status.i_status = PLAYLIST_STOPPED;
355             if( p_playlist->status.p_item &&
356                 p_playlist->status.p_item->i_flags & PLAYLIST_REMOVE_FLAG )
357             {
358                 PL_DEBUG( "deleting item marked for deletion" );
359                 playlist_ItemDelete( p_playlist->status.p_item );
360                 p_playlist->status.p_item = NULL;
361             }
362
363             /* Collect garbage */
364             PL_UNLOCK;
365             ObjectGarbageCollector( p_playlist, b_gc_forced );
366             PL_LOCK;
367         }
368     }
369     PL_UNLOCK
370 }
371
372 /** Playlist dying last loop */
373 void playlist_LastLoop( playlist_t *p_playlist )
374 {
375     vlc_object_t *p_obj;
376
377     /* If there is an input, kill it */
378     while( 1 )
379     {
380         PL_LOCK
381
382         if( p_playlist->p_input == NULL )
383         {
384             PL_UNLOCK
385             break;
386         }
387
388         if( p_playlist->p_input->b_dead )
389         {
390             input_thread_t *p_input;
391
392             /* Unlink current input */
393             p_input = p_playlist->p_input;
394             p_playlist->p_input = NULL;
395             PL_UNLOCK
396
397             /* Destroy input */
398             input_DestroyThread( p_input );
399             continue;
400         }
401         else if( p_playlist->p_input->b_die )
402         {
403             /* This input is dying, leave it alone */
404             ;
405         }
406         else if( p_playlist->p_input->b_error || p_playlist->p_input->b_eof )
407         {
408             input_StopThread( p_playlist->p_input );
409             PL_UNLOCK
410             continue;
411         }
412         else
413         {
414             p_playlist->p_input->b_eof = 1;
415         }
416
417         PL_UNLOCK
418
419         msleep( INTF_IDLE_SLEEP );
420     }
421
422     /* close all remaining sout */
423     while( ( p_obj = vlc_object_find( p_playlist,
424                                       VLC_OBJECT_SOUT, FIND_CHILD ) ) )
425     {
426         vlc_object_detach( p_obj );
427         vlc_object_release( p_obj );
428         sout_DeleteInstance( (sout_instance_t*)p_obj );
429     }
430
431     /* close all remaining vout */
432     while( ( p_obj = vlc_object_find( p_playlist,
433                                       VLC_OBJECT_VOUT, FIND_CHILD ) ) )
434     {
435         vlc_object_detach( p_obj );
436         vlc_object_release( p_obj );
437         vout_Destroy( (vout_thread_t *)p_obj );
438     }
439
440     while( p_playlist->i_sds )
441     {
442         playlist_ServicesDiscoveryRemove( p_playlist,
443                                           p_playlist->pp_sds[0]->p_sd->psz_module );
444     }
445
446     playlist_MLDump( p_playlist );
447
448     PL_LOCK;
449     /* Go through all items, and simply free everything without caring
450      * about the tree structure. Do not decref, it will be done by doing
451      * the same thing on the input items array */
452     FOREACH_ARRAY( playlist_item_t *p_del, p_playlist->all_items )
453         free( p_del->pp_children );
454         free( p_del );
455     FOREACH_END();
456     ARRAY_RESET( p_playlist->all_items );
457
458     FOREACH_ARRAY( input_item_t *p_del, p_playlist->input_items )
459         input_ItemClean( p_del );
460         free( p_del );
461     FOREACH_END();
462     ARRAY_RESET( p_playlist->input_items );
463
464     ARRAY_RESET( p_playlist->items );
465     ARRAY_RESET( p_playlist->current );
466
467     PL_UNLOCK;
468 }
469
470 /** Main loop for preparser queue */
471 void playlist_PreparseLoop( playlist_preparse_t *p_obj )
472 {
473     playlist_t *p_playlist = (playlist_t *)p_obj->p_parent;
474     input_item_t *p_current;
475     int i_activity;
476     uint32_t i_m, i_o;
477
478     while( !p_playlist->b_die )
479     {
480         vlc_mutex_lock( &p_obj->object_lock );
481         while( p_obj->i_waiting == 0 )
482         {
483             vlc_cond_wait( &p_obj->object_wait, &p_obj->object_lock );
484             if( p_playlist->b_die )
485             {
486                 vlc_mutex_unlock( &p_obj->object_lock );
487                 return;
488             }
489         }
490
491         p_current = p_obj->pp_waiting[0];
492         REMOVE_ELEM( p_obj->pp_waiting, p_obj->i_waiting, 0 );
493         vlc_mutex_unlock( &p_obj->object_lock );
494
495         PL_LOCK;
496         if( p_current )
497         {
498             if( !strncmp( p_current->psz_uri, "file:", 5 ) )
499             {
500                 stats_TimerStart( p_playlist, "Preparse run",
501                                   STATS_TIMER_PREPARSE );
502                 /* Do not preparse if it is already done (like by playing it) */
503                 if( !input_item_IsPreparsed( p_current ) )
504                 {
505                     PL_UNLOCK;
506                     input_Preparse( p_playlist, p_current );
507                     PL_LOCK;
508                 }
509                 stats_TimerStop( p_playlist, STATS_TIMER_PREPARSE );
510                 PL_UNLOCK;
511                 input_item_SetPreparsed( p_current, VLC_TRUE );
512                 var_SetInteger( p_playlist, "item-change", p_current->i_id );
513                 PL_LOCK;
514             }
515             /* If we haven't retrieved enough meta, add to secondary queue
516              * which will run the "meta fetchers".
517              * This only checks for meta, not for art
518              * \todo don't do this for things we won't get meta for, like vids
519              */
520             char *psz_arturl = input_item_GetArtURL( p_current );
521             char *psz_name = input_item_GetName( p_current );
522             if( !input_MetaSatisfied( p_playlist, p_current, &i_m, &i_o ) )
523             {
524                 preparse_item_t p;
525                 PL_DEBUG("need to fetch meta for %s", p_current->psz_name );
526                 p.p_item = p_current;
527                 p.b_fetch_art = VLC_FALSE;
528                 vlc_mutex_lock( &p_playlist->p_fetcher->object_lock );
529                 INSERT_ELEM( p_playlist->p_fetcher->p_waiting,
530                              p_playlist->p_fetcher->i_waiting,
531                              p_playlist->p_fetcher->i_waiting, p);
532                 vlc_cond_signal( &p_playlist->p_fetcher->object_wait );
533                 vlc_mutex_unlock( &p_playlist->p_fetcher->object_lock );
534             }
535             /* We already have all needed meta, but we need art right now */
536             else if( p_playlist->p_fetcher->i_art_policy == ALBUM_ART_ALL &&
537                         ( !psz_arturl || strncmp( psz_arturl, "file://", 7 ) ) )
538             {
539                 preparse_item_t p;
540                 PL_DEBUG("meta ok for %s, need to fetch art", psz_name );
541                 p.p_item = p_current;
542                 p.b_fetch_art = VLC_TRUE;
543                 vlc_mutex_lock( &p_playlist->p_fetcher->object_lock );
544                 INSERT_ELEM( p_playlist->p_fetcher->p_waiting,
545                              p_playlist->p_fetcher->i_waiting,
546                              p_playlist->p_fetcher->i_waiting, p);
547                 vlc_cond_signal( &p_playlist->p_fetcher->object_wait );
548                 vlc_mutex_unlock( &p_playlist->p_fetcher->object_lock );
549             }
550             else
551             {
552                 PL_DEBUG( "no fetch required for %s (art currently %s)",
553                           psz_name, psz_arturl );
554                 vlc_gc_decref( p_current );
555             }
556             free( psz_name );
557             free( psz_arturl );
558             PL_UNLOCK;
559         }
560         else
561             PL_UNLOCK;
562
563         vlc_mutex_lock( &p_obj->object_lock );
564         i_activity = var_GetInteger( p_playlist, "activity" );
565         if( i_activity < 0 ) i_activity = 0;
566         vlc_mutex_unlock( &p_obj->object_lock );
567         /* Sleep at least 1ms */
568         msleep( (i_activity+1) * 1000 );
569     }
570 }
571
572 /** Main loop for secondary preparser queue */
573 void playlist_FetcherLoop( playlist_fetcher_t *p_obj )
574 {
575     playlist_t *p_playlist = (playlist_t *)p_obj->p_parent;
576     vlc_bool_t b_fetch_art;
577     input_item_t *p_item;
578     int i_activity;
579
580     while( !p_playlist->b_die )
581     {
582         vlc_mutex_lock( &p_obj->object_lock );
583         while( p_obj->i_waiting == 0 )
584         {
585             vlc_cond_wait( &p_obj->object_wait, &p_obj->object_lock );
586             if( p_playlist->b_die )
587             {
588                 vlc_mutex_unlock( &p_obj->object_lock );
589                 return;
590             }
591         }
592
593         b_fetch_art = p_obj->p_waiting->b_fetch_art;
594         p_item = p_obj->p_waiting->p_item;
595         REMOVE_ELEM( p_obj->p_waiting, p_obj->i_waiting, 0 );
596         vlc_mutex_unlock( &p_obj->object_lock );
597         if( p_item )
598         {
599             if( !b_fetch_art )
600             {
601                 input_MetaFetch( p_playlist, p_item );
602                 var_SetInteger( p_playlist, "item-change", p_item->i_id );
603                 /*  Fetch right now */
604                 if( p_playlist->p_fetcher->i_art_policy == ALBUM_ART_ALL )
605                 {
606                     vlc_mutex_lock( &p_obj->object_lock );
607                     preparse_item_t p;
608                     p.p_item = p_item;
609                     p.b_fetch_art = VLC_TRUE;
610                     INSERT_ELEM( p_playlist->p_fetcher->p_waiting,
611                                  p_playlist->p_fetcher->i_waiting,
612                                  0, p );
613                     PL_DEBUG("meta fetched for %s, get art", p_item->psz_name);
614                     vlc_mutex_unlock( &p_obj->object_lock );
615                     continue;
616                 }
617                 else
618                     vlc_gc_decref( p_item );
619             }
620             else
621             {
622                 int i_ret;
623
624                 /* Check if it is not yet preparsed and if so wait for it (at most 0.5s)
625                  * (This can happen if we fetch art on play)
626                  * FIXME this doesn't work if we need to fetch meta before art ... */
627                 for( i_ret = 0; i_ret < 10 && !input_item_IsPreparsed( p_item ); i_ret++ )
628                 {
629                     vlc_bool_t b_break;
630                     PL_LOCK;
631                     b_break = ( !p_playlist->p_input || input_GetItem(p_playlist->p_input) != p_item  ||
632                                 p_playlist->p_input->b_die || p_playlist->p_input->b_eof || p_playlist->p_input->b_error );
633                     PL_UNLOCK;
634                     if( b_break )
635                         break;
636                     msleep( 50000 );
637                 }
638
639                 i_ret = input_ArtFind( p_playlist, p_item );
640                 if( i_ret == 1 )
641                 {
642                     PL_DEBUG("downloading art for %s", p_item->psz_name );
643                     if( input_DownloadAndCacheArt( p_playlist, p_item ) )
644                         input_item_SetArtNotFound( p_item, VLC_TRUE );
645                     else {
646                         input_item_SetArtFetched( p_item, VLC_TRUE );
647                         var_SetInteger( p_playlist, "item-change",
648                                         p_item->i_id );
649                     }
650                 }
651                 else if( i_ret == 0 ) /* Was in cache */
652                 {
653                     PL_DEBUG("found art for %s in cache", p_item->psz_name );
654                     input_item_SetArtFetched( p_item, VLC_TRUE );
655                     var_SetInteger( p_playlist, "item-change", p_item->i_id );
656                 }
657                 else
658                 {
659                     PL_DEBUG("art not found for %s", p_item->psz_name );
660                     input_item_SetArtNotFound( p_item, VLC_TRUE );
661                 }
662                 vlc_gc_decref( p_item );
663            }
664         }
665         vlc_mutex_lock( &p_obj->object_lock );
666         i_activity = var_GetInteger( p_playlist, "activity" );
667         if( i_activity < 0 ) i_activity = 0;
668         vlc_mutex_unlock( &p_obj->object_lock );
669         /* Sleep at least 1ms */
670         msleep( (i_activity+1) * 1000 );
671     }
672 }
673
674 static void VariablesInit( playlist_t *p_playlist )
675 {
676     vlc_value_t val;
677     /* These variables control updates */
678     var_Create( p_playlist, "intf-change", VLC_VAR_BOOL );
679     val.b_bool = VLC_TRUE;
680     var_Set( p_playlist, "intf-change", val );
681
682     var_Create( p_playlist, "item-change", VLC_VAR_INTEGER );
683     val.i_int = -1;
684     var_Set( p_playlist, "item-change", val );
685
686     var_Create( p_playlist, "item-deleted", VLC_VAR_INTEGER );
687     val.i_int = -1;
688     var_Set( p_playlist, "item-deleted", val );
689
690     var_Create( p_playlist, "item-append", VLC_VAR_ADDRESS );
691
692     var_Create( p_playlist, "playlist-current", VLC_VAR_INTEGER );
693     val.i_int = -1;
694     var_Set( p_playlist, "playlist-current", val );
695
696     var_Create( p_playlist, "intf-popupmenu", VLC_VAR_BOOL );
697
698     var_Create( p_playlist, "intf-show", VLC_VAR_BOOL );
699     val.b_bool = VLC_TRUE;
700     var_Set( p_playlist, "intf-show", val );
701
702     var_Create( p_playlist, "activity", VLC_VAR_INTEGER );
703     var_SetInteger( p_playlist, "activity", 0 );
704
705     /* Variables to control playback */
706     var_CreateGetBool( p_playlist, "play-and-stop" );
707     var_CreateGetBool( p_playlist, "play-and-exit" );
708     var_CreateGetBool( p_playlist, "random" );
709     var_CreateGetBool( p_playlist, "repeat" );
710     var_CreateGetBool( p_playlist, "loop" );
711
712     var_AddCallback( p_playlist, "random", RandomCallback, NULL );
713 }