1 /*****************************************************************************
2 * fetcher.c: Art fetcher thread.
3 *****************************************************************************
4 * Copyright © 1999-2009 the VideoLAN team
7 * Authors: Samuel Hocevar <sam@zoy.org>
8 * Clément Stenac <zorglub@videolan.org>
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.
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.
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 *****************************************************************************/
28 #include <vlc_common.h>
29 #include <vlc_playlist.h>
30 #include <vlc_stream.h>
35 #include "playlist_internal.h"
38 /*****************************************************************************
39 * Structures/definitions
40 *****************************************************************************/
41 struct playlist_fetcher_t
45 playlist_t *p_playlist;
49 bool b_live, b_zombie;
52 input_item_t **pp_waiting;
54 DECL_ARRAY(playlist_album_t) albums;
57 static void *Thread( void * );
60 /*****************************************************************************
62 *****************************************************************************/
63 playlist_fetcher_t *playlist_fetcher_New( playlist_t *p_playlist )
65 playlist_fetcher_t *p_fetcher =
66 vlc_custom_create( p_playlist, sizeof(*p_fetcher),
67 VLC_OBJECT_GENERIC, "playlist fetcher" );
72 vlc_object_attach( p_fetcher, p_playlist );
73 p_fetcher->p_playlist = p_playlist;
74 vlc_mutex_init( &p_fetcher->lock );
75 p_fetcher->b_live = false;
76 p_fetcher->b_zombie = false;
77 p_fetcher->i_waiting = 0;
78 p_fetcher->pp_waiting = NULL;
79 p_fetcher->i_art_policy = var_GetInteger( p_playlist, "album-art" );
80 ARRAY_INIT( p_fetcher->albums );
85 void playlist_fetcher_Push( playlist_fetcher_t *p_fetcher, input_item_t *p_item )
87 vlc_gc_incref( p_item );
89 vlc_mutex_lock( &p_fetcher->lock );
90 if( p_fetcher->b_zombie ) /* FIXME: detach the thread */
92 vlc_join( p_fetcher->thread, NULL );
93 p_fetcher->b_zombie = false;
96 INSERT_ELEM( p_fetcher->pp_waiting, p_fetcher->i_waiting,
97 p_fetcher->i_waiting, p_item );
98 if( !p_fetcher->b_live )
100 if( vlc_clone( &p_fetcher->thread, Thread, p_fetcher,
101 VLC_THREAD_PRIORITY_LOW ) )
102 msg_Err( p_fetcher, "cannot spawn secondary preparse thread" );
104 p_fetcher->b_live = true;
106 vlc_mutex_unlock( &p_fetcher->lock );
109 void playlist_fetcher_Delete( playlist_fetcher_t *p_fetcher )
112 /* Destroy the item meta-infos fetcher */
113 vlc_mutex_lock( &p_fetcher->lock );
114 if( p_fetcher->b_live )
116 vlc_object_kill( p_fetcher );
117 vlc_cancel( p_fetcher->thread );
119 b_join = p_fetcher->b_live || p_fetcher->b_zombie;
120 vlc_mutex_unlock( &p_fetcher->lock );
122 vlc_join( p_fetcher->thread, NULL );
124 while( p_fetcher->i_waiting > 0 )
125 { /* Any left-over unparsed item? */
126 vlc_gc_decref( p_fetcher->pp_waiting[0] );
127 REMOVE_ELEM( p_fetcher->pp_waiting, p_fetcher->i_waiting, 0 );
129 vlc_mutex_destroy( &p_fetcher->lock );
130 vlc_object_release( p_fetcher );
134 /*****************************************************************************
136 *****************************************************************************/
138 * This function locates the art associated to an input item.
140 * 0 : Art is in cache or is a local file
141 * 1 : Art found, need to download
142 * -X : Error/not found
144 static int FindArt( playlist_fetcher_t *p_fetcher, input_item_t *p_item )
148 char *psz_title, *psz_artist, *psz_album;
150 psz_artist = input_item_GetArtist( p_item );
151 psz_album = input_item_GetAlbum( p_item );
152 psz_title = input_item_GetTitle( p_item );
154 psz_title = input_item_GetName( p_item );
156 if( !psz_title && !psz_artist && !psz_album )
161 /* If we already checked this album in this session, skip */
162 if( psz_artist && psz_album )
164 FOREACH_ARRAY( playlist_album_t album, p_fetcher->albums )
165 if( !strcmp( album.psz_artist, psz_artist ) &&
166 !strcmp( album.psz_album, psz_album ) )
168 msg_Dbg( p_fetcher, " %s - %s has already been searched",
169 psz_artist, psz_album );
170 /* TODO-fenrir if we cache art filename too, we can go faster */
175 if( !strncmp( album.psz_arturl, "file://", 7 ) )
176 input_item_SetArtURL( p_item, album.psz_arturl );
177 else /* Actually get URL from cache */
178 playlist_FindArtInCache( p_item );
191 playlist_FindArtInCache( p_item );
193 char *psz_arturl = input_item_GetArtURL( p_item );
196 /* We already have an URL */
197 if( !strncmp( psz_arturl, "file://", strlen( "file://" ) ) )
200 return 0; /* Art is in cache, no need to go further */
205 /* Art need to be put in cache */
210 psz_album = input_item_GetAlbum( p_item );
211 psz_artist = input_item_GetArtist( p_item );
212 if( psz_album && psz_artist )
214 msg_Dbg( p_fetcher, "searching art for %s - %s",
215 psz_artist, psz_album );
219 psz_title = input_item_GetTitle( p_item );
221 psz_title = input_item_GetName( p_item );
223 msg_Dbg( p_fetcher, "searching art for %s", psz_title );
227 /* Fetch the art url */
228 p_fetcher->p_private = p_item;
230 p_module = module_need( p_fetcher, "art finder", NULL, false );
234 module_unneed( p_fetcher, p_module );
239 msg_Dbg( p_fetcher, "unable to find art" );
240 i_ret = VLC_EGENERIC;
243 /* Record this album */
244 if( psz_artist && psz_album )
247 a.psz_artist = psz_artist;
248 a.psz_album = psz_album;
249 a.psz_arturl = input_item_GetArtURL( p_item );
250 a.b_found = (i_ret == VLC_EGENERIC ? false : true );
251 ARRAY_APPEND( p_fetcher->albums, a );
263 * Download the art using the URL or an art downloaded
264 * This function should be called only if data is not already in cache
266 static int DownloadArt( playlist_fetcher_t *p_fetcher, input_item_t *p_item )
268 char *psz_arturl = input_item_GetArtURL( p_item );
269 assert( *psz_arturl );
271 if( !strncmp( psz_arturl , "file://", 7 ) )
273 msg_Dbg( p_fetcher, "Album art is local file, no need to cache" );
278 if( !strncmp( psz_arturl , "APIC", 4 ) )
280 msg_Warn( p_fetcher, "APIC fetch not supported yet" );
284 stream_t *p_stream = stream_UrlNew( p_fetcher, psz_arturl );
288 uint8_t *p_data = NULL;
294 if( i_data >= INT_MAX - i_read )
297 p_data = realloc( p_data, i_data + i_read );
301 i_read = stream_Read( p_stream, &p_data[i_data], i_read );
307 stream_Delete( p_stream );
309 if( p_data && i_data > 0 )
311 char *psz_type = strrchr( psz_arturl, '.' );
312 if( psz_type && strlen( psz_type ) > 5 )
313 psz_type = NULL; /* remove extension if it's > to 4 characters */
315 playlist_SaveArt( p_fetcher->p_playlist, p_item, p_data, i_data, psz_type );
329 static int InputEvent( vlc_object_t *p_this, char const *psz_cmd,
330 vlc_value_t oldval, vlc_value_t newval, void *p_data )
332 VLC_UNUSED(p_this); VLC_UNUSED(psz_cmd); VLC_UNUSED(oldval);
333 vlc_cond_t *p_cond = p_data;
335 if( newval.i_int == INPUT_EVENT_ITEM_META ||
336 newval.i_int == INPUT_EVENT_DEAD )
337 vlc_cond_signal( p_cond );
343 /* Check if it is not yet preparsed and if so wait for it
345 * (This can happen if we fetch art on play)
346 * FIXME this doesn't work if we need to fetch meta before art...
348 static void WaitPreparsed( playlist_fetcher_t *p_fetcher, input_item_t *p_item )
350 if( input_item_IsPreparsed( p_item ) )
353 input_thread_t *p_input = playlist_CurrentInput( p_fetcher->p_playlist );
357 if( input_GetItem( p_input ) != p_item )
361 vlc_cond_init( &cond );
362 var_AddCallback( p_input, "intf-event", InputEvent, &cond );
364 const mtime_t i_deadline = mdate() + 500*1000;
365 bool b_timeout = false;
367 while( !p_input->b_eof && !p_input->b_error
368 && !input_item_IsPreparsed( p_item ) && !b_timeout )
370 /* A bit weird, but input_item_IsPreparsed holds the protected value */
371 /* FIXME: locking looks wrong here */
372 vlc_mutex_lock( &p_fetcher->lock );
373 if( vlc_cond_timedwait( &cond, &p_fetcher->lock, i_deadline ) )
375 vlc_mutex_unlock( &p_fetcher->lock );
378 var_DelCallback( p_input, "intf-event", InputEvent, p_fetcher );
379 vlc_cond_destroy( &cond );
382 vlc_object_release( p_input );
385 static void *Thread( void *p_data )
387 playlist_fetcher_t *p_fetcher = p_data;
388 playlist_t *p_playlist = p_fetcher->p_playlist;
392 input_item_t *p_item = NULL;
394 vlc_mutex_lock( &p_fetcher->lock );
395 if( p_fetcher->i_waiting != 0 )
397 p_item = p_fetcher->pp_waiting[0];
398 REMOVE_ELEM( p_fetcher->pp_waiting, p_fetcher->i_waiting, 0 );
402 p_fetcher->b_live = false;
403 p_fetcher->b_zombie = true;
405 vlc_mutex_unlock( &p_fetcher->lock );
411 int canc = vlc_savecancel();
413 /* Wait that the input item is preparsed if it is being played */
414 WaitPreparsed( p_fetcher, p_item );
417 if( !vlc_object_alive( p_fetcher ) )
420 /* Find art, and download it if needed */
421 int i_ret = FindArt( p_fetcher, p_item );
424 if( !vlc_object_alive( p_fetcher ) )
428 i_ret = DownloadArt( p_fetcher, p_item );
431 char *psz_name = input_item_GetName( p_item );
432 if( !i_ret ) /* Art is now in cache */
434 PL_DEBUG( "found art for %s in cache", psz_name );
435 input_item_SetArtFetched( p_item, true );
436 var_SetAddress( p_playlist, "item-change", p_item );
440 PL_DEBUG( "art not found for %s", psz_name );
441 input_item_SetArtNotFound( p_item, true );
446 vlc_gc_decref( p_item );
448 vlc_restorecancel( canc );
450 int i_activity = var_GetInteger( p_playlist, "activity" );
451 if( i_activity < 0 ) i_activity = 0;
452 /* Sleep at least 1ms and handle potential thread cancellation */
453 msleep( (i_activity+1) * 1000 );