c1b9b97e7eb32139a56e3f2485375b6b6a8cb9af
[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 #ifdef HAVE_CONFIG_H
26 # include "config.h"
27 #endif
28
29 #include <vlc/vlc.h>
30 #include <vlc_vout.h>
31 #include <vlc_sout.h>
32 #include <vlc_playlist.h>
33 #include <vlc_interface.h>
34 #include "playlist_internal.h"
35 #include "stream_output/stream_output.h" /* sout_DeleteInstance */
36
37 /*****************************************************************************
38  * Local prototypes
39  *****************************************************************************/
40 static void VariablesInit( playlist_t *p_playlist );
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 = VLC_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     playlist_t *p_playlist;
63     vlc_bool_t b_save;
64     int i_tree;
65
66     /* Allocate structure */
67     p_playlist = vlc_object_create( p_parent, VLC_OBJECT_PLAYLIST );
68     if( !p_playlist )
69     {
70         msg_Err( p_parent, "out of memory" );
71         return NULL;
72     }
73
74     TAB_INIT( p_playlist->i_sds, p_playlist->pp_sds );
75
76     p_parent->p_libvlc->p_playlist = p_playlist;
77
78     VariablesInit( p_playlist );
79
80     /* Initialise data structures */
81     vlc_mutex_init( p_playlist, &p_playlist->gc_lock );
82     p_playlist->i_last_playlist_id = 0;
83     p_playlist->i_last_input_id = 0;
84     p_playlist->p_input = NULL;
85
86     p_playlist->gc_date = 0;
87     p_playlist->b_cant_sleep = VLC_FALSE;
88
89     ARRAY_INIT( p_playlist->items );
90     ARRAY_INIT( p_playlist->all_items );
91     ARRAY_INIT( p_playlist->input_items );
92     ARRAY_INIT( p_playlist->current );
93
94     p_playlist->i_current_index = 0;
95     p_playlist->b_reset_currently_playing = VLC_TRUE;
96     p_playlist->last_rebuild_date = 0;
97
98     i_tree = var_CreateGetBool( p_playlist, "playlist-tree" );
99     p_playlist->b_always_tree = (i_tree == 1);
100     p_playlist->b_never_tree = (i_tree == 2);
101
102     p_playlist->b_doing_ml = VLC_FALSE;
103
104     p_playlist->b_auto_preparse =
105                         var_CreateGetBool( p_playlist, "auto-preparse" ) ;
106
107     p_playlist->p_root_category = playlist_NodeCreate( p_playlist, NULL, NULL,
108                                     0, NULL );
109     p_playlist->p_root_onelevel = playlist_NodeCreate( p_playlist, NULL, NULL,
110                                     0, p_playlist->p_root_category->p_input );
111
112     if( !p_playlist->p_root_category || !p_playlist->p_root_onelevel )
113         return NULL;
114
115     /* Create playlist and media library */
116     playlist_NodesPairCreate( p_playlist, _( "Playlist" ),
117                             &p_playlist->p_local_category,
118                             &p_playlist->p_local_onelevel, VLC_FALSE );
119
120     p_playlist->p_local_category->i_flags |= PLAYLIST_RO_FLAG;
121     p_playlist->p_local_onelevel->i_flags |= PLAYLIST_RO_FLAG;
122
123     if( !p_playlist->p_local_category || !p_playlist->p_local_onelevel ||
124         !p_playlist->p_local_category->p_input ||
125         !p_playlist->p_local_onelevel->p_input )
126         return NULL;
127
128     if( config_GetInt( p_playlist, "media-library") )
129     {
130         playlist_NodesPairCreate( p_playlist, _( "Media Library" ),
131                             &p_playlist->p_ml_category,
132                             &p_playlist->p_ml_onelevel, VLC_FALSE );
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     }
140     else
141     {
142         p_playlist->p_ml_category = p_playlist->p_ml_onelevel = NULL;
143     }
144
145     /* Initial status */
146     p_playlist->status.p_item = NULL;
147     p_playlist->status.p_node = p_playlist->p_local_onelevel;
148     p_playlist->request.b_request = VLC_FALSE;
149     p_playlist->status.i_status = PLAYLIST_STOPPED;
150
151     p_playlist->i_sort = SORT_ID;
152     p_playlist->i_order = ORDER_NORMAL;
153
154
155     b_save = p_playlist->b_auto_preparse;
156     p_playlist->b_auto_preparse = VLC_FALSE;
157     playlist_MLLoad( p_playlist );
158     p_playlist->b_auto_preparse = VLC_TRUE;
159
160     vlc_object_set_destructor( p_playlist, playlist_Destructor );
161
162     return p_playlist;
163 }
164
165 /**
166  * Destroy playlist
167  *
168  * Destroy a playlist structure.
169  * \param p_playlist the playlist object
170  * \return nothing
171  */
172 void playlist_Destroy( playlist_t *p_playlist )
173 {
174     /* XXX: should go in the playlist destructor */
175     var_Destroy( p_playlist, "intf-change" );
176     var_Destroy( p_playlist, "item-change" );
177     var_Destroy( p_playlist, "playlist-current" );
178     var_Destroy( p_playlist, "intf-popupmenu" );
179     var_Destroy( p_playlist, "intf-show" );
180     var_Destroy( p_playlist, "play-and-stop" );
181     var_Destroy( p_playlist, "play-and-exit" );
182     var_Destroy( p_playlist, "random" );
183     var_Destroy( p_playlist, "repeat" );
184     var_Destroy( p_playlist, "loop" );
185     var_Destroy( p_playlist, "activity" );
186
187     vlc_object_release( p_playlist );
188 }
189
190 static void playlist_Destructor( vlc_object_t * p_this )
191 {
192     playlist_t * p_playlist = (playlist_t *)p_this;
193
194     // Kill preparser
195     if( p_playlist->p_preparse )
196     {
197         vlc_object_release( p_playlist->p_preparse );
198     }
199
200     // Kill meta fetcher
201     if( p_playlist->p_fetcher )
202     {
203         vlc_object_release( p_playlist->p_fetcher );
204     }
205
206     // Stats
207     vlc_mutex_destroy( &p_playlist->p_stats->lock );
208     if( p_playlist->p_stats )
209         free( p_playlist->p_stats );
210 }
211
212 /* Destroy remaining objects */
213 static void ObjectGarbageCollector( playlist_t *p_playlist, vlc_bool_t b_force )
214 {
215     vlc_object_t *p_obj;
216
217     if( !b_force )
218     {
219         if( mdate() - p_playlist->gc_date < 1000000 )
220         {
221             p_playlist->b_cant_sleep = VLC_TRUE;
222             return;
223         }
224         else if( p_playlist->gc_date == 0 )
225             return;
226     }
227
228     vlc_mutex_lock( &p_playlist->gc_lock );
229     while( ( p_obj = vlc_object_find( p_playlist, VLC_OBJECT_VOUT,
230                                                   FIND_CHILD ) ) )
231     {
232         if( p_obj->p_parent != VLC_OBJECT(p_playlist) )
233         {
234             vlc_object_release( p_obj );
235             break;
236         }
237         msg_Dbg( p_playlist, "garbage collector destroying 1 vout" );
238         vlc_object_detach( p_obj );
239         vlc_object_release( p_obj );
240         vout_Destroy( (vout_thread_t *)p_obj );
241     }
242     while( ( p_obj = vlc_object_find( p_playlist, VLC_OBJECT_SOUT,
243                                                   FIND_CHILD ) ) )
244     {
245         if( p_obj->p_parent != VLC_OBJECT(p_playlist) )
246         {
247             vlc_object_release( p_obj );
248             break;
249         }
250         msg_Dbg( p_playlist, "garbage collector destroying 1 sout" );
251         vlc_object_detach( p_obj );
252         vlc_object_release( p_obj );
253         sout_DeleteInstance( (sout_instance_t*)p_obj );
254     }
255     p_playlist->b_cant_sleep = VLC_FALSE;
256     vlc_mutex_unlock( &p_playlist->gc_lock );
257 }
258
259 /**
260  * Main loop
261  *
262  * Main loop for the playlist
263  * \param p_playlist the playlist object
264  * \return nothing
265  */
266 void playlist_MainLoop( playlist_t *p_playlist )
267 {
268     playlist_item_t *p_item = NULL;
269     vlc_bool_t b_playexit = var_GetBool( p_playlist, "play-and-exit" );
270     PL_LOCK;
271
272     if( p_playlist->b_reset_currently_playing &&
273         mdate() - p_playlist->last_rebuild_date > 30000 ) // 30 ms
274     {
275         ResetCurrentlyPlaying( p_playlist, var_GetBool( p_playlist, "random" ),
276                              p_playlist->status.p_item );
277         p_playlist->last_rebuild_date = mdate();
278     }
279
280 check_input:
281     /* If there is an input, check that it doesn't need to die. */
282     if( p_playlist->p_input )
283     {
284         if( p_playlist->request.b_request && !p_playlist->p_input->b_die )
285         {
286             PL_DEBUG( "incoming request - stopping current input" );
287             input_StopThread( p_playlist->p_input );
288         }
289
290         /* This input is dead. Remove it ! */
291         if( p_playlist->p_input->b_dead )
292         {
293             int i_activity;
294             input_thread_t *p_input;
295             PL_DEBUG( "dead input" );
296
297             p_input = p_playlist->p_input;
298             p_playlist->p_input = NULL;
299
300             /* Release the playlist lock, because we may get stuck
301              * in vlc_object_release() for some time. */
302             PL_UNLOCK;
303
304             /* Destroy input */
305             vlc_object_release( p_input );
306
307             PL_LOCK;
308
309             p_playlist->gc_date = mdate();
310             p_playlist->b_cant_sleep = VLC_TRUE;
311
312             if( p_playlist->status.p_item->i_flags
313                 & PLAYLIST_REMOVE_FLAG )
314             {
315                  PL_DEBUG( "%s was marked for deletion, deleting",
316                                  PLI_NAME( p_playlist->status.p_item  ) );
317                  playlist_ItemDelete( p_playlist->status.p_item );
318                  if( p_playlist->request.p_item == p_playlist->status.p_item )
319                      p_playlist->request.p_item = NULL;
320                  p_playlist->status.p_item = NULL;
321             }
322
323             i_activity= var_GetInteger( p_playlist, "activity" );
324             var_SetInteger( p_playlist, "activity", i_activity -
325                             DEFAULT_INPUT_ACTIVITY );
326             goto check_input;
327         }
328         /* This input is dying, let it do */
329         else if( p_playlist->p_input->b_die )
330         {
331             PL_DEBUG( "dying input" );
332             PL_UNLOCK;
333             msleep( INTF_IDLE_SLEEP );
334             PL_LOCK;
335             goto check_input;
336         }
337         /* This input has finished, ask it to die ! */
338         else if( p_playlist->p_input->b_error
339                   || p_playlist->p_input->b_eof )
340         {
341             PL_DEBUG( "finished input" );
342             input_StopThread( p_playlist->p_input );
343             /* No need to wait here, we'll wait in the p_input->b_die case */
344             goto check_input;
345         }
346         else if( p_playlist->p_input->i_state != INIT_S )
347         {
348             PL_UNLOCK;
349             ObjectGarbageCollector( p_playlist, VLC_FALSE );
350             PL_LOCK;
351         }
352     }
353     else
354     {
355         /* No input. Several cases
356          *  - No request, running status -> start new item
357          *  - No request, stopped status -> collect garbage
358          *  - Request, running requested -> start new item
359          *  - Request, stopped requested -> collect garbage
360         */
361         if( p_playlist->request.i_status != PLAYLIST_STOPPED )
362         {
363             msg_Dbg( p_playlist, "starting new item" );
364             p_item = playlist_NextItem( p_playlist );
365
366             if( p_item == NULL )
367             {
368                 msg_Dbg( p_playlist, "nothing to play" );
369                 p_playlist->status.i_status = PLAYLIST_STOPPED;
370                 PL_UNLOCK;
371
372                 if( b_playexit == VLC_TRUE )
373                 {
374                     msg_Info( p_playlist, "end of playlist, exiting" );
375                     vlc_object_kill( p_playlist->p_libvlc );
376                 }
377                 ObjectGarbageCollector( p_playlist, VLC_TRUE );
378                 return;
379              }
380              playlist_PlayItem( p_playlist, p_item );
381          }
382          else
383          {
384             const vlc_bool_t b_gc_forced = p_playlist->status.i_status != PLAYLIST_STOPPED;
385
386             p_playlist->status.i_status = PLAYLIST_STOPPED;
387             if( p_playlist->status.p_item &&
388                 p_playlist->status.p_item->i_flags & PLAYLIST_REMOVE_FLAG )
389             {
390                 PL_DEBUG( "deleting item marked for deletion" );
391                 playlist_ItemDelete( p_playlist->status.p_item );
392                 p_playlist->status.p_item = NULL;
393             }
394
395             /* Collect garbage */
396             PL_UNLOCK;
397             ObjectGarbageCollector( p_playlist, b_gc_forced );
398             PL_LOCK;
399         }
400     }
401     PL_UNLOCK;
402 }
403
404
405 /**
406  * Last loop
407  *
408  * The playlist is dying so do the last loop
409  * \param p_playlist the playlist object
410  * \return nothing
411 */
412 void playlist_LastLoop( playlist_t *p_playlist )
413 {
414     vlc_object_t *p_obj;
415
416     /* If there is an input, kill it */
417     while( 1 )
418     {
419         PL_LOCK;
420         if( p_playlist->p_input == NULL )
421         {
422             PL_UNLOCK;
423             break;
424         }
425
426         if( p_playlist->p_input->b_dead )
427         {
428             input_thread_t *p_input;
429
430             /* Unlink current input */
431             p_input = p_playlist->p_input;
432             p_playlist->p_input = NULL;
433             PL_UNLOCK;
434
435             /* Destroy input */
436             vlc_object_release( p_input );
437             continue;
438         }
439         else if( p_playlist->p_input->b_die )
440         {
441             /* This input is dying, leave it alone */
442             ;
443         }
444         else if( p_playlist->p_input->b_error || p_playlist->p_input->b_eof )
445         {
446             input_StopThread( p_playlist->p_input );
447             PL_UNLOCK;
448             continue;
449         }
450         else
451         {
452             p_playlist->p_input->b_eof = 1;
453         }
454         PL_UNLOCK;
455
456         msleep( INTF_IDLE_SLEEP );
457     }
458
459     /* close all remaining sout */
460     while( ( p_obj = vlc_object_find( p_playlist,
461                                       VLC_OBJECT_SOUT, FIND_CHILD ) ) )
462     {
463         vlc_object_detach( p_obj );
464         vlc_object_release( p_obj );
465         sout_DeleteInstance( (sout_instance_t*)p_obj );
466     }
467
468     /* close all remaining vout */
469     while( ( p_obj = vlc_object_find( p_playlist,
470                                       VLC_OBJECT_VOUT, FIND_CHILD ) ) )
471     {
472         vlc_object_detach( p_obj );
473         vlc_object_release( p_obj );
474         vout_Destroy( (vout_thread_t *)p_obj );
475     }
476
477     while( p_playlist->i_sds )
478     {
479         playlist_ServicesDiscoveryRemove( p_playlist,
480                                           p_playlist->pp_sds[0]->p_sd->psz_module );
481     }
482
483     playlist_MLDump( p_playlist );
484
485     PL_LOCK;
486     /* Go through all items, and simply free everything without caring
487      * about the tree structure. Do not decref, it will be done by doing
488      * the same thing on the input items array */
489     FOREACH_ARRAY( playlist_item_t *p_del, p_playlist->all_items )
490         free( p_del->pp_children );
491         free( p_del );
492     FOREACH_END();
493     ARRAY_RESET( p_playlist->all_items );
494
495     FOREACH_ARRAY( input_item_t *p_del, p_playlist->input_items )
496         input_ItemClean( p_del );
497         free( p_del );
498     FOREACH_END();
499     ARRAY_RESET( p_playlist->input_items );
500
501     ARRAY_RESET( p_playlist->items );
502     ARRAY_RESET( p_playlist->current );
503
504     PL_UNLOCK;
505 }
506
507 /**
508  * Preparse loop
509  *
510  * Main loop for preparser queue
511  * \param p_obj items to preparse
512  * \return nothing
513  */
514 void playlist_PreparseLoop( playlist_preparse_t *p_obj )
515 {
516     playlist_t *p_playlist = (playlist_t *)p_obj->p_parent;
517     input_item_t *p_current;
518     int i_activity;
519     uint32_t i_m, i_o;
520
521     while( !p_playlist->b_die )
522     {
523         vlc_object_lock( p_obj );
524         while( p_obj->i_waiting == 0 )
525         {
526             if( vlc_object_wait( p_obj ) || p_playlist->b_die )
527             {
528                 vlc_object_unlock( p_obj );
529                 return;
530             }
531         }
532
533         p_current = p_obj->pp_waiting[0];
534         REMOVE_ELEM( p_obj->pp_waiting, p_obj->i_waiting, 0 );
535         vlc_object_unlock( p_obj );
536
537         PL_LOCK;
538         if( p_current )
539         {
540             if( p_current->i_type == ITEM_TYPE_FILE )
541             {
542                 stats_TimerStart( p_playlist, "Preparse run",
543                                   STATS_TIMER_PREPARSE );
544                 /* Do not preparse if it is already done (like by playing it) */
545                 if( !input_item_IsPreparsed( p_current ) )
546                 {
547                     PL_UNLOCK;
548                     input_Preparse( p_playlist, p_current );
549                     PL_LOCK;
550                 }
551                 stats_TimerStop( p_playlist, STATS_TIMER_PREPARSE );
552                 PL_UNLOCK;
553                 input_item_SetPreparsed( p_current, VLC_TRUE );
554                 var_SetInteger( p_playlist, "item-change", p_current->i_id );
555                 PL_LOCK;
556             }
557             /* If we haven't retrieved enough meta, add to secondary queue
558              * which will run the "meta fetchers".
559              * This only checks for meta, not for art
560              * \todo don't do this for things we won't get meta for, like vids
561              */
562             char *psz_arturl = input_item_GetArtURL( p_current );
563             char *psz_name = input_item_GetName( p_current );
564             if( !input_MetaSatisfied( p_playlist, p_current, &i_m, &i_o ) )
565             {
566                 preparse_item_t p;
567                 PL_DEBUG( "need to fetch meta for %s", p_current->psz_name );
568                 p.p_item = p_current;
569                 p.b_fetch_art = VLC_FALSE;
570                 vlc_object_lock( p_playlist->p_fetcher );
571                 INSERT_ELEM( p_playlist->p_fetcher->p_waiting,
572                              p_playlist->p_fetcher->i_waiting,
573                              p_playlist->p_fetcher->i_waiting, p);
574                 vlc_object_signal_unlocked( p_playlist->p_fetcher );
575                 vlc_object_unlock( p_playlist->p_fetcher );
576             }
577             /* We already have all needed meta, but we need art right now */
578             else if( p_playlist->p_fetcher->i_art_policy == ALBUM_ART_ALL &&
579                         ( !psz_arturl || strncmp( psz_arturl, "file://", 7 ) ) )
580             {
581                 preparse_item_t p;
582                 PL_DEBUG("meta ok for %s, need to fetch art", psz_name );
583                 p.p_item = p_current;
584                 p.b_fetch_art = VLC_TRUE;
585                 vlc_object_lock( p_playlist->p_fetcher );
586                 INSERT_ELEM( p_playlist->p_fetcher->p_waiting,
587                              p_playlist->p_fetcher->i_waiting,
588                              p_playlist->p_fetcher->i_waiting, p);
589                 vlc_object_signal_unlocked( p_playlist->p_fetcher );
590                 vlc_object_unlock( p_playlist->p_fetcher );
591             }
592             else
593             {
594                 PL_DEBUG( "no fetch required for %s (art currently %s)",
595                           psz_name, psz_arturl );
596                 vlc_gc_decref( p_current );
597             }
598             free( psz_name );
599             free( psz_arturl );
600             PL_UNLOCK;
601         }
602         else
603             PL_UNLOCK;
604
605         vlc_object_lock( p_obj );
606         i_activity = var_GetInteger( p_playlist, "activity" );
607         if( i_activity < 0 ) i_activity = 0;
608         vlc_object_unlock( p_obj );
609         /* Sleep at least 1ms */
610         msleep( (i_activity+1) * 1000 );
611     }
612 }
613
614 /**
615  * Fetcher loop
616  *
617  * Main loop for secondary preparser queue
618  * \param p_obj items to preparse
619  * \return nothing
620  */
621 void playlist_FetcherLoop( playlist_fetcher_t *p_obj )
622 {
623     playlist_t *p_playlist = (playlist_t *)p_obj->p_parent;
624     vlc_bool_t b_fetch_art;
625     input_item_t *p_item;
626     int i_activity;
627
628     while( !p_playlist->b_die )
629     {
630         vlc_mutex_lock( &p_obj->object_lock );
631         while( p_obj->i_waiting == 0 )
632         {
633             vlc_cond_wait( &p_obj->object_wait, &p_obj->object_lock );
634             if( p_playlist->b_die )
635             {
636                 vlc_mutex_unlock( &p_obj->object_lock );
637                 return;
638             }
639         }
640
641         b_fetch_art = p_obj->p_waiting->b_fetch_art;
642         p_item = p_obj->p_waiting->p_item;
643         REMOVE_ELEM( p_obj->p_waiting, p_obj->i_waiting, 0 );
644         vlc_mutex_unlock( &p_obj->object_lock );
645         if( p_item )
646         {
647             if( !b_fetch_art )
648             {
649                 /* If the user doesn't want us to fetch meta automatically
650                  * abort here. */
651                 if( p_playlist->p_fetcher->b_fetch_meta )
652                 {
653                     input_MetaFetch( p_playlist, p_item );
654                     var_SetInteger( p_playlist, "item-change", p_item->i_id );
655                 }
656
657                 /*  Fetch right now */
658                 if( p_playlist->p_fetcher->i_art_policy == ALBUM_ART_ALL )
659                 {
660                     vlc_mutex_lock( &p_obj->object_lock );
661                     preparse_item_t p;
662                     p.p_item = p_item;
663                     p.b_fetch_art = VLC_TRUE;
664                     INSERT_ELEM( p_playlist->p_fetcher->p_waiting,
665                                  p_playlist->p_fetcher->i_waiting,
666                                  0, p );
667                     PL_DEBUG( "meta fetched for %s, get art", p_item->psz_name );
668                     vlc_mutex_unlock( &p_obj->object_lock );
669                     continue;
670                 }
671                 else
672                     vlc_gc_decref( p_item );
673             }
674             else
675             {
676                 int i_ret;
677
678                 /* Check if it is not yet preparsed and if so wait for it (at most 0.5s)
679                  * (This can happen if we fetch art on play)
680                  * FIXME this doesn't work if we need to fetch meta before art ... */
681                 for( i_ret = 0; i_ret < 10 && !input_item_IsPreparsed( p_item ); i_ret++ )
682                 {
683                     vlc_bool_t b_break;
684                     PL_LOCK;
685                     b_break = ( !p_playlist->p_input || input_GetItem(p_playlist->p_input) != p_item  ||
686                                 p_playlist->p_input->b_die || p_playlist->p_input->b_eof || p_playlist->p_input->b_error );
687                     PL_UNLOCK;
688                     if( b_break )
689                         break;
690                     msleep( 50000 );
691                 }
692
693                 i_ret = input_ArtFind( p_playlist, p_item );
694                 if( i_ret == 1 )
695                 {
696                     PL_DEBUG( "downloading art for %s", p_item->psz_name );
697                     if( input_DownloadAndCacheArt( p_playlist, p_item ) )
698                         input_item_SetArtNotFound( p_item, VLC_TRUE );
699                     else {
700                         input_item_SetArtFetched( p_item, VLC_TRUE );
701                         var_SetInteger( p_playlist, "item-change",
702                                         p_item->i_id );
703                     }
704                 }
705                 else if( i_ret == 0 ) /* Was in cache */
706                 {
707                     PL_DEBUG( "found art for %s in cache", p_item->psz_name );
708                     input_item_SetArtFetched( p_item, VLC_TRUE );
709                     var_SetInteger( p_playlist, "item-change", p_item->i_id );
710                 }
711                 else
712                 {
713                     PL_DEBUG( "art not found for %s", p_item->psz_name );
714                     input_item_SetArtNotFound( p_item, VLC_TRUE );
715                 }
716                 vlc_gc_decref( p_item );
717            }
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     }
726 }
727
728 static void VariablesInit( playlist_t *p_playlist )
729 {
730     vlc_value_t val;
731     /* These variables control updates */
732     var_Create( p_playlist, "intf-change", VLC_VAR_BOOL );
733     val.b_bool = VLC_TRUE;
734     var_Set( p_playlist, "intf-change", val );
735
736     var_Create( p_playlist, "item-change", VLC_VAR_INTEGER );
737     val.i_int = -1;
738     var_Set( p_playlist, "item-change", val );
739
740     var_Create( p_playlist, "item-deleted", VLC_VAR_INTEGER );
741     val.i_int = -1;
742     var_Set( p_playlist, "item-deleted", val );
743
744     var_Create( p_playlist, "item-append", VLC_VAR_ADDRESS );
745
746     var_Create( p_playlist, "playlist-current", VLC_VAR_INTEGER );
747     val.i_int = -1;
748     var_Set( p_playlist, "playlist-current", val );
749
750     var_Create( p_playlist, "intf-popupmenu", VLC_VAR_BOOL );
751
752     var_Create( p_playlist, "intf-show", VLC_VAR_BOOL );
753     val.b_bool = VLC_TRUE;
754     var_Set( p_playlist, "intf-show", val );
755
756     var_Create( p_playlist, "activity", VLC_VAR_INTEGER );
757     var_SetInteger( p_playlist, "activity", 0 );
758
759     /* Variables to control playback */
760     var_CreateGetBool( p_playlist, "play-and-stop" );
761     var_CreateGetBool( p_playlist, "play-and-exit" );
762     var_CreateGetBool( p_playlist, "random" );
763     var_CreateGetBool( p_playlist, "repeat" );
764     var_CreateGetBool( p_playlist, "loop" );
765
766     var_AddCallback( p_playlist, "random", RandomCallback, NULL );
767 }