1 /*****************************************************************************
2 * preparse.c: Preparser 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>
33 #include "preparser.h"
34 #include "../input/input_interface.h"
37 /*****************************************************************************
38 * Structures/definitions
39 *****************************************************************************/
40 struct playlist_preparser_t
42 playlist_t *p_playlist;
43 playlist_fetcher_t *p_fetcher;
47 bool b_live, b_zombie;
48 input_item_t **pp_waiting;
54 static void *Thread( void * );
56 /*****************************************************************************
58 *****************************************************************************/
59 playlist_preparser_t *playlist_preparser_New( playlist_t *p_playlist, playlist_fetcher_t *p_fetcher )
61 playlist_preparser_t *p_preparser = malloc( sizeof(*p_preparser) );
65 p_preparser->p_playlist = p_playlist;
66 p_preparser->p_fetcher = p_fetcher;
67 vlc_mutex_init( &p_preparser->lock );
68 p_preparser->b_zombie = p_preparser->b_live = false;
69 p_preparser->i_art_policy = var_GetInteger( p_playlist, "album-art" );
70 p_preparser->i_waiting = 0;
71 p_preparser->pp_waiting = NULL;
76 void playlist_preparser_Push( playlist_preparser_t *p_preparser, input_item_t *p_item )
78 vlc_gc_incref( p_item );
80 vlc_mutex_lock( &p_preparser->lock );
81 if( p_preparser->b_zombie )
83 vlc_join( p_preparser->thread, NULL );
84 p_preparser->b_zombie = false;
86 INSERT_ELEM( p_preparser->pp_waiting, p_preparser->i_waiting,
87 p_preparser->i_waiting, p_item );
88 if( !p_preparser->b_live )
90 if( vlc_clone( &p_preparser->thread, Thread, p_preparser,
91 VLC_THREAD_PRIORITY_LOW ) )
92 msg_Warn( p_preparser->p_playlist,
93 "cannot spawn pre-parser thread" );
95 p_preparser->b_live = true;
97 vlc_mutex_unlock( &p_preparser->lock );
100 void playlist_preparser_Delete( playlist_preparser_t *p_preparser )
104 /* Destroy the item preparser */
105 vlc_mutex_lock( &p_preparser->lock );
106 if( p_preparser->b_live )
107 vlc_cancel( p_preparser->thread );
108 b_join = p_preparser->b_live || p_preparser->b_zombie;
109 vlc_mutex_unlock( &p_preparser->lock );
111 vlc_join( p_preparser->thread, NULL );
113 while( p_preparser->i_waiting > 0 )
114 { /* Any left-over unparsed item? */
115 vlc_gc_decref( p_preparser->pp_waiting[0] );
116 REMOVE_ELEM( p_preparser->pp_waiting, p_preparser->i_waiting, 0 );
118 vlc_mutex_destroy( &p_preparser->lock );
122 /*****************************************************************************
124 *****************************************************************************/
126 * This function preparses an item when needed.
128 static void Preparse( playlist_t *p_playlist, input_item_t *p_item )
130 vlc_mutex_lock( &p_item->lock );
131 int i_type = p_item->i_type;
132 vlc_mutex_unlock( &p_item->lock );
134 if( i_type != ITEM_TYPE_FILE )
137 stats_TimerStart( p_playlist, "Preparse run", STATS_TIMER_PREPARSE );
139 /* Do not preparse if it is already done (like by playing it) */
140 if( !input_item_IsPreparsed( p_item ) )
142 input_Preparse( VLC_OBJECT(p_playlist), p_item );
143 input_item_SetPreparsed( p_item, true );
145 var_SetAddress( p_playlist, "item-change", p_item );
148 stats_TimerStop( p_playlist, STATS_TIMER_PREPARSE );
152 * This function ask the fetcher object to fetch the art when needed
154 static void Art( playlist_preparser_t *p_preparser, input_item_t *p_item )
156 playlist_t *p_playlist = p_preparser->p_playlist;
157 playlist_fetcher_t *p_fetcher = p_preparser->p_fetcher;
159 bool b_fetch = false;
160 /* If we haven't retrieved enough meta, add to secondary queue
161 * which will run the "meta fetchers".
162 * This only checks for meta, not for art
163 * \todo don't do this for things we won't get meta for, like vids
166 vlc_mutex_lock( &p_item->lock );
169 const char *psz_arturl = vlc_meta_Get( p_item->p_meta, vlc_meta_ArtworkURL );
170 const char *psz_name = vlc_meta_Get( p_item->p_meta, vlc_meta_Title );
172 if( p_preparser->i_art_policy == ALBUM_ART_ALL &&
173 ( !psz_arturl || strncmp( psz_arturl, "file://", 7 ) ) )
175 msg_Dbg( p_playlist, "meta ok for %s, need to fetch art", psz_name );
180 msg_Dbg( p_playlist, "no fetch required for %s (art currently %s)",
181 psz_name, psz_arturl );
184 vlc_mutex_unlock( &p_item->lock );
186 if( b_fetch && p_fetcher )
187 playlist_fetcher_Push( p_fetcher, p_item );
191 * This function does the preparsing and issues the art fetching requests
193 static void *Thread( void *data )
195 playlist_preparser_t *p_preparser = data;
196 playlist_t *p_playlist = p_preparser->p_playlist;
200 input_item_t *p_current;
203 vlc_mutex_lock( &p_preparser->lock );
204 if( p_preparser->i_waiting > 0 )
206 p_current = p_preparser->pp_waiting[0];
207 REMOVE_ELEM( p_preparser->pp_waiting, p_preparser->i_waiting, 0 );
212 p_preparser->b_live = false;
213 p_preparser->b_zombie = true;
215 vlc_mutex_unlock( &p_preparser->lock );
220 int canc = vlc_savecancel();
222 Preparse( p_playlist, p_current );
224 Art( p_preparser, p_current );
226 vlc_restorecancel( canc );
229 int i_activity = var_GetInteger( p_playlist, "activity" );
233 /* Sleep at least 1ms and cancel thread if needed */
234 msleep( (i_activity+1) * 1000 );