1 /*****************************************************************************
2 * preparser.c: Preparser thread.
3 *****************************************************************************
4 * Copyright © 1999-2009 VLC authors and VideoLAN
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 it
11 * under the terms of the GNU Lesser General Public License as published by
12 * the Free Software Foundation; either version 2.1 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 Lesser General Public License for more details.
20 * You should have received a copy of the GNU Lesser General Public License
21 * along with this program; if not, write to the Free Software Foundation,
22 * Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
23 *****************************************************************************/
28 #include <vlc_common.h>
31 #include "preparser.h"
32 #include "input/input_interface.h"
34 /*****************************************************************************
35 * Structures/definitions
36 *****************************************************************************/
37 struct playlist_preparser_t
40 playlist_fetcher_t *p_fetcher;
45 input_item_t **pp_waiting;
51 static void *Thread( void * );
53 /*****************************************************************************
55 *****************************************************************************/
56 playlist_preparser_t *playlist_preparser_New( vlc_object_t *parent )
58 playlist_preparser_t *p_preparser = malloc( sizeof(*p_preparser) );
62 p_preparser->object = parent;
63 p_preparser->p_fetcher = playlist_fetcher_New( parent );
64 if( unlikely(p_preparser->p_fetcher == NULL) )
65 msg_Err( parent, "cannot create fetcher" );
67 vlc_mutex_init( &p_preparser->lock );
68 vlc_cond_init( &p_preparser->wait );
69 p_preparser->b_live = false;
70 p_preparser->i_art_policy = var_InheritInteger( parent, "album-art" );
71 p_preparser->i_waiting = 0;
72 p_preparser->pp_waiting = NULL;
77 void playlist_preparser_Push( playlist_preparser_t *p_preparser, input_item_t *p_item )
79 vlc_gc_incref( p_item );
81 vlc_mutex_lock( &p_preparser->lock );
82 INSERT_ELEM( p_preparser->pp_waiting, p_preparser->i_waiting,
83 p_preparser->i_waiting, p_item );
84 if( !p_preparser->b_live )
86 if( vlc_clone_detach( NULL, Thread, p_preparser,
87 VLC_THREAD_PRIORITY_LOW ) )
88 msg_Warn( p_preparser->object, "cannot spawn pre-parser thread" );
90 p_preparser->b_live = true;
92 vlc_mutex_unlock( &p_preparser->lock );
95 void playlist_preparser_fetcher_Push( playlist_preparser_t *p_preparser,
96 input_item_t *p_item )
98 if( p_preparser->p_fetcher != NULL )
99 playlist_fetcher_Push( p_preparser->p_fetcher, p_item );
102 void playlist_preparser_Delete( playlist_preparser_t *p_preparser )
104 vlc_mutex_lock( &p_preparser->lock );
105 /* Remove pending item to speed up preparser thread exit */
106 while( p_preparser->i_waiting > 0 )
108 vlc_gc_decref( p_preparser->pp_waiting[0] );
109 REMOVE_ELEM( p_preparser->pp_waiting, p_preparser->i_waiting, 0 );
112 while( p_preparser->b_live )
113 vlc_cond_wait( &p_preparser->wait, &p_preparser->lock );
114 vlc_mutex_unlock( &p_preparser->lock );
116 /* Destroy the item preparser */
117 vlc_cond_destroy( &p_preparser->wait );
118 vlc_mutex_destroy( &p_preparser->lock );
120 if( p_preparser->p_fetcher != NULL )
121 playlist_fetcher_Delete( p_preparser->p_fetcher );
125 /*****************************************************************************
127 *****************************************************************************/
129 * This function preparses an item when needed.
131 static void Preparse( vlc_object_t *obj, input_item_t *p_item )
133 vlc_mutex_lock( &p_item->lock );
134 int i_type = p_item->i_type;
135 vlc_mutex_unlock( &p_item->lock );
137 if( i_type != ITEM_TYPE_FILE )
139 input_item_SetPreparsed( p_item, true );
143 /* Do not preparse if it is already done (like by playing it) */
144 if( !input_item_IsPreparsed( p_item ) )
146 input_Preparse( obj, p_item );
147 input_item_SetPreparsed( p_item, true );
149 var_SetAddress( obj, "item-change", p_item );
154 * This function ask the fetcher object to fetch the art when needed
156 static void Art( playlist_preparser_t *p_preparser, input_item_t *p_item )
158 vlc_object_t *obj = p_preparser->object;
159 playlist_fetcher_t *p_fetcher = p_preparser->p_fetcher;
161 bool b_fetch = false;
162 /* If we haven't retrieved enough meta, add to secondary queue
163 * which will run the "meta fetchers".
164 * This only checks for meta, not for art
165 * \todo don't do this for things we won't get meta for, like vids
168 vlc_mutex_lock( &p_item->lock );
171 const char *psz_arturl = vlc_meta_Get( p_item->p_meta, vlc_meta_ArtworkURL );
172 const char *psz_name = vlc_meta_Get( p_item->p_meta, vlc_meta_Title );
174 if( p_preparser->i_art_policy == ALBUM_ART_ALL &&
176 ( strncmp( psz_arturl, "file://", 7 ) &&
177 strncmp( psz_arturl, "attachment://", 13 ) ) ) )
179 msg_Dbg( obj, "meta ok for %s, need to fetch art",
180 psz_name ? psz_name : "(null)" );
185 msg_Dbg( obj, "no fetch required for %s (art currently %s)",
186 psz_name ? psz_name : "(null)",
187 psz_arturl ? psz_arturl : "(null)" );
190 vlc_mutex_unlock( &p_item->lock );
192 if( b_fetch && p_fetcher )
193 playlist_fetcher_Push( p_fetcher, p_item );
197 * This function does the preparsing and issues the art fetching requests
199 static void *Thread( void *data )
201 playlist_preparser_t *p_preparser = data;
202 vlc_object_t *obj = p_preparser->object;
206 input_item_t *p_current;
209 vlc_mutex_lock( &p_preparser->lock );
210 if( p_preparser->i_waiting > 0 )
212 p_current = p_preparser->pp_waiting[0];
213 REMOVE_ELEM( p_preparser->pp_waiting, p_preparser->i_waiting, 0 );
218 p_preparser->b_live = false;
219 vlc_cond_signal( &p_preparser->wait );
221 vlc_mutex_unlock( &p_preparser->lock );
226 Preparse( obj, p_current );
228 Art( p_preparser, p_current );
229 vlc_gc_decref(p_current);