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>
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
43 playlist_fetcher_t *p_fetcher;
48 input_item_t **pp_waiting;
54 static void *Thread( void * );
56 /*****************************************************************************
58 *****************************************************************************/
59 playlist_preparser_t *playlist_preparser_New( vlc_object_t *parent )
61 playlist_preparser_t *p_preparser = malloc( sizeof(*p_preparser) );
65 p_preparser->object = parent;
66 p_preparser->p_fetcher = playlist_fetcher_New( parent );
67 if( unlikely(p_preparser->p_fetcher == NULL) )
68 msg_Err( parent, "cannot create fetcher" );
70 vlc_mutex_init( &p_preparser->lock );
71 vlc_cond_init( &p_preparser->wait );
72 p_preparser->b_live = false;
73 p_preparser->i_art_policy = var_InheritInteger( parent, "album-art" );
74 p_preparser->i_waiting = 0;
75 p_preparser->pp_waiting = NULL;
80 void playlist_preparser_Push( playlist_preparser_t *p_preparser, input_item_t *p_item )
82 vlc_gc_incref( p_item );
84 vlc_mutex_lock( &p_preparser->lock );
85 INSERT_ELEM( p_preparser->pp_waiting, p_preparser->i_waiting,
86 p_preparser->i_waiting, p_item );
87 if( !p_preparser->b_live )
89 if( vlc_clone_detach( NULL, Thread, p_preparser,
90 VLC_THREAD_PRIORITY_LOW ) )
91 msg_Warn( p_preparser->object, "cannot spawn pre-parser thread" );
93 p_preparser->b_live = true;
95 vlc_mutex_unlock( &p_preparser->lock );
98 void playlist_preparser_fetcher_Push( playlist_preparser_t *p_preparser,
99 input_item_t *p_item )
101 if( p_preparser->p_fetcher != NULL )
102 playlist_fetcher_Push( p_preparser->p_fetcher, p_item );
105 void playlist_preparser_Delete( playlist_preparser_t *p_preparser )
107 vlc_mutex_lock( &p_preparser->lock );
108 /* Remove pending item to speed up preparser thread exit */
109 while( p_preparser->i_waiting > 0 )
111 vlc_gc_decref( p_preparser->pp_waiting[0] );
112 REMOVE_ELEM( p_preparser->pp_waiting, p_preparser->i_waiting, 0 );
115 while( p_preparser->b_live )
116 vlc_cond_wait( &p_preparser->wait, &p_preparser->lock );
117 vlc_mutex_unlock( &p_preparser->lock );
119 /* Destroy the item preparser */
120 vlc_cond_destroy( &p_preparser->wait );
121 vlc_mutex_destroy( &p_preparser->lock );
123 if( p_preparser->p_fetcher != NULL )
124 playlist_fetcher_Delete( p_preparser->p_fetcher );
128 /*****************************************************************************
130 *****************************************************************************/
132 * This function preparses an item when needed.
134 static void Preparse( vlc_object_t *obj, input_item_t *p_item )
136 vlc_mutex_lock( &p_item->lock );
137 int i_type = p_item->i_type;
138 vlc_mutex_unlock( &p_item->lock );
140 if( i_type != ITEM_TYPE_FILE )
142 input_item_SetPreparsed( p_item, true );
146 /* Do not preparse if it is already done (like by playing it) */
147 if( !input_item_IsPreparsed( p_item ) )
149 input_Preparse( obj, p_item );
150 input_item_SetPreparsed( p_item, true );
152 var_SetAddress( obj, "item-change", p_item );
157 * This function ask the fetcher object to fetch the art when needed
159 static void Art( playlist_preparser_t *p_preparser, input_item_t *p_item )
161 vlc_object_t *obj = p_preparser->object;
162 playlist_fetcher_t *p_fetcher = p_preparser->p_fetcher;
164 bool b_fetch = false;
165 /* If we haven't retrieved enough meta, add to secondary queue
166 * which will run the "meta fetchers".
167 * This only checks for meta, not for art
168 * \todo don't do this for things we won't get meta for, like vids
171 vlc_mutex_lock( &p_item->lock );
174 const char *psz_arturl = vlc_meta_Get( p_item->p_meta, vlc_meta_ArtworkURL );
175 const char *psz_name = vlc_meta_Get( p_item->p_meta, vlc_meta_Title );
177 if( p_preparser->i_art_policy == ALBUM_ART_ALL &&
179 ( strncmp( psz_arturl, "file://", 7 ) &&
180 strncmp( psz_arturl, "attachment://", 13 ) ) ) )
182 msg_Dbg( obj, "meta ok for %s, need to fetch art",
183 psz_name ? psz_name : "(null)" );
188 msg_Dbg( obj, "no fetch required for %s (art currently %s)",
189 psz_name ? psz_name : "(null)",
190 psz_arturl ? psz_arturl : "(null)" );
193 vlc_mutex_unlock( &p_item->lock );
195 if( b_fetch && p_fetcher )
196 playlist_fetcher_Push( p_fetcher, p_item );
200 * This function does the preparsing and issues the art fetching requests
202 static void *Thread( void *data )
204 playlist_preparser_t *p_preparser = data;
205 vlc_object_t *obj = p_preparser->object;
209 input_item_t *p_current;
212 vlc_mutex_lock( &p_preparser->lock );
213 if( p_preparser->i_waiting > 0 )
215 p_current = p_preparser->pp_waiting[0];
216 REMOVE_ELEM( p_preparser->pp_waiting, p_preparser->i_waiting, 0 );
221 p_preparser->b_live = false;
222 vlc_cond_signal( &p_preparser->wait );
224 vlc_mutex_unlock( &p_preparser->lock );
229 Preparse( obj, p_current );
231 Art( p_preparser, p_current );
232 vlc_gc_decref(p_current);