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[vlc] / src / playlist / preparser.c
1 /*****************************************************************************
2  * preparse.c: Preparser thread.
3  *****************************************************************************
4  * Copyright © 1999-2009 VLC authors and VideoLAN
5  * $Id$
6  *
7  * Authors: Samuel Hocevar <sam@zoy.org>
8  *          Clément Stenac <zorglub@videolan.org>
9  *
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.
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 Lesser General Public License for more details.
19  *
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  *****************************************************************************/
24 #ifdef HAVE_CONFIG_H
25 # include "config.h"
26 #endif
27
28 #include <vlc_common.h>
29 #include <vlc_playlist.h>
30
31 #include "art.h"
32 #include "fetcher.h"
33 #include "preparser.h"
34 #include "../input/input_interface.h"
35
36
37 /*****************************************************************************
38  * Structures/definitions
39  *****************************************************************************/
40 struct playlist_preparser_t
41 {
42     playlist_t          *p_playlist;
43     playlist_fetcher_t  *p_fetcher;
44
45     vlc_mutex_t     lock;
46     vlc_cond_t      wait;
47     bool            b_live;
48     input_item_t  **pp_waiting;
49     int             i_waiting;
50
51     int             i_art_policy;
52 };
53
54 static void *Thread( void * );
55
56 /*****************************************************************************
57  * Public functions
58  *****************************************************************************/
59 playlist_preparser_t *playlist_preparser_New( playlist_t *p_playlist, playlist_fetcher_t *p_fetcher )
60 {
61     playlist_preparser_t *p_preparser = malloc( sizeof(*p_preparser) );
62     if( !p_preparser )
63         return NULL;
64
65     p_preparser->p_playlist = p_playlist;
66     p_preparser->p_fetcher = p_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_GetInteger( p_playlist, "album-art" );
71     p_preparser->i_waiting = 0;
72     p_preparser->pp_waiting = NULL;
73
74     return p_preparser;
75 }
76
77 void playlist_preparser_Push( playlist_preparser_t *p_preparser, input_item_t *p_item )
78 {
79     vlc_gc_incref( p_item );
80
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 )
85     {
86         if( vlc_clone_detach( NULL, Thread, p_preparser,
87                               VLC_THREAD_PRIORITY_LOW ) )
88             msg_Warn( p_preparser->p_playlist,
89                       "cannot spawn pre-parser thread" );
90         else
91             p_preparser->b_live = true;
92     }
93     vlc_mutex_unlock( &p_preparser->lock );
94 }
95
96 void playlist_preparser_Delete( playlist_preparser_t *p_preparser )
97 {
98     vlc_mutex_lock( &p_preparser->lock );
99     /* Remove pending item to speed up preparser thread exit */
100     while( p_preparser->i_waiting > 0 )
101     {
102         vlc_gc_decref( p_preparser->pp_waiting[0] );
103         REMOVE_ELEM( p_preparser->pp_waiting, p_preparser->i_waiting, 0 );
104     }
105
106     while( p_preparser->b_live )
107         vlc_cond_wait( &p_preparser->wait, &p_preparser->lock );
108     vlc_mutex_unlock( &p_preparser->lock );
109
110     /* Destroy the item preparser */
111     vlc_cond_destroy( &p_preparser->wait );
112     vlc_mutex_destroy( &p_preparser->lock );
113     free( p_preparser );
114 }
115
116 /*****************************************************************************
117  * Privates functions
118  *****************************************************************************/
119 /**
120  * This function preparses an item when needed.
121  */
122 static void Preparse( playlist_t *p_playlist, input_item_t *p_item )
123 {
124     vlc_mutex_lock( &p_item->lock );
125     int i_type = p_item->i_type;
126     vlc_mutex_unlock( &p_item->lock );
127
128     if( i_type != ITEM_TYPE_FILE )
129     {
130         input_item_SetPreparsed( p_item, true );
131         return;
132     }
133
134     stats_TimerStart( p_playlist, "Preparse run", STATS_TIMER_PREPARSE );
135
136     /* Do not preparse if it is already done (like by playing it) */
137     if( !input_item_IsPreparsed( p_item ) )
138     {
139         input_Preparse( VLC_OBJECT(p_playlist), p_item );
140         input_item_SetPreparsed( p_item, true );
141
142         var_SetAddress( p_playlist, "item-change", p_item );
143     }
144
145     stats_TimerStop( p_playlist, STATS_TIMER_PREPARSE );
146 }
147
148 /**
149  * This function ask the fetcher object to fetch the art when needed
150  */
151 static void Art( playlist_preparser_t *p_preparser, input_item_t *p_item )
152 {
153     playlist_t *p_playlist = p_preparser->p_playlist;
154     playlist_fetcher_t *p_fetcher = p_preparser->p_fetcher;
155
156     bool b_fetch = false;
157     /* If we haven't retrieved enough meta, add to secondary queue
158      * which will run the "meta fetchers".
159      * This only checks for meta, not for art
160      * \todo don't do this for things we won't get meta for, like vids
161      */
162
163     vlc_mutex_lock( &p_item->lock );
164     if( p_item->p_meta )
165     {
166         const char *psz_arturl = vlc_meta_Get( p_item->p_meta, vlc_meta_ArtworkURL );
167         const char *psz_name = vlc_meta_Get( p_item->p_meta, vlc_meta_Title );
168
169         if( p_preparser->i_art_policy == ALBUM_ART_ALL &&
170             ( !psz_arturl || strncmp( psz_arturl, "file://", 7 ) ) )
171         {
172             msg_Dbg( p_playlist, "meta ok for %s, need to fetch art",
173                      psz_name ? psz_name : "(null)" );
174             b_fetch = true;
175         }
176         else
177         {
178             msg_Dbg( p_playlist, "no fetch required for %s (art currently %s)",
179                      psz_name ? psz_name : "(null)",
180                      psz_arturl ? psz_arturl : "(null)" );
181         }
182     }
183     vlc_mutex_unlock( &p_item->lock );
184
185     if( b_fetch && p_fetcher )
186         playlist_fetcher_Push( p_fetcher, p_item );
187 }
188
189 /**
190  * This function does the preparsing and issues the art fetching requests
191  */
192 static void *Thread( void *data )
193 {
194     playlist_preparser_t *p_preparser = data;
195     playlist_t *p_playlist = p_preparser->p_playlist;
196
197     for( ;; )
198     {
199         input_item_t *p_current;
200
201         /* */
202         vlc_mutex_lock( &p_preparser->lock );
203         if( p_preparser->i_waiting > 0 )
204         {
205             p_current = p_preparser->pp_waiting[0];
206             REMOVE_ELEM( p_preparser->pp_waiting, p_preparser->i_waiting, 0 );
207         }
208         else
209         {
210             p_current = NULL;
211             p_preparser->b_live = false;
212             vlc_cond_signal( &p_preparser->wait );
213         }
214         vlc_mutex_unlock( &p_preparser->lock );
215
216         if( !p_current )
217             break;
218
219         Preparse( p_playlist, p_current );
220
221         Art( p_preparser, p_current );
222         vlc_gc_decref(p_current);
223     }
224     return NULL;
225 }
226