fetcher and preparser don't need object names
[vlc.git] / src / playlist / thread.c
1 /*****************************************************************************
2  * thread.c : Playlist management functions
3  *****************************************************************************
4  * Copyright © 1999-2008 the VideoLAN team
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
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.
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 General Public License for more details.
19  *
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  *****************************************************************************/
24 #ifdef HAVE_CONFIG_H
25 # include "config.h"
26 #endif
27
28 #include <vlc_common.h>
29 #include <vlc_es.h>
30 #include <vlc_input.h>
31 #include <vlc_interface.h>
32 #include <vlc_playlist.h>
33 #include "playlist_internal.h"
34
35 /*****************************************************************************
36  * Local prototypes
37  *****************************************************************************/
38 static void* RunControlThread   ( vlc_object_t * );
39 static void* RunPreparse        ( vlc_object_t * );
40 static void* RunFetcher         ( vlc_object_t * );
41 static void PreparseDestructor  ( vlc_object_t * );
42 static void FetcherDestructor   ( vlc_object_t * );
43
44 /*****************************************************************************
45  * Main functions for the global thread
46  *****************************************************************************/
47
48 /**
49  * Create the main playlist thread
50  * Additionally to the playlist, this thread controls :
51  *    - Statistics
52  *    - VLM
53  * \param p_parent
54  * \return an object with a started thread
55  */
56 void __playlist_ThreadCreate( vlc_object_t *p_parent )
57 {
58     playlist_t *p_playlist = playlist_Create( p_parent );
59     if( !p_playlist ) return;
60
61     // Preparse
62     static const char ppname[] = "preparser";
63     p_playlist->p->p_preparse =
64         vlc_custom_create( p_playlist, sizeof( playlist_preparse_t ),
65                            VLC_OBJECT_GENERIC, ppname );
66     if( !p_playlist->p->p_preparse )
67     {
68         msg_Err( p_playlist, "unable to create preparser" );
69         vlc_object_release( p_playlist );
70         return;
71     }
72     p_playlist->p->p_preparse->i_waiting = 0;
73     p_playlist->p->p_preparse->pp_waiting = NULL;
74
75     vlc_object_set_destructor( p_playlist->p->p_preparse, PreparseDestructor );
76
77     vlc_object_attach( p_playlist->p->p_preparse, p_playlist );
78     if( vlc_thread_create( p_playlist->p->p_preparse, "preparser",
79                            RunPreparse, VLC_THREAD_PRIORITY_LOW, true ) )
80     {
81         msg_Err( p_playlist, "cannot spawn preparse thread" );
82         vlc_object_release( p_playlist->p->p_preparse );
83         return;
84     }
85
86     // Secondary Preparse
87     static const char fname[] = "fetcher";
88     p_playlist->p->p_fetcher =
89         vlc_custom_create( p_playlist, sizeof( playlist_fetcher_t ),
90                            VLC_OBJECT_GENERIC, fname );
91     if( !p_playlist->p->p_fetcher )
92     {
93         msg_Err( p_playlist, "unable to create secondary preparser" );
94         vlc_object_release( p_playlist );
95         return;
96     }
97     p_playlist->p->p_fetcher->i_waiting = 0;
98     p_playlist->p->p_fetcher->pp_waiting = NULL;
99     p_playlist->p->p_fetcher->i_art_policy = var_CreateGetInteger( p_playlist,
100                                                                 "album-art" );
101
102     vlc_object_set_destructor( p_playlist->p->p_fetcher, FetcherDestructor );
103
104     vlc_object_attach( p_playlist->p->p_fetcher, p_playlist );
105     if( vlc_thread_create( p_playlist->p->p_fetcher,
106                            "fetcher",
107                            RunFetcher,
108                            VLC_THREAD_PRIORITY_LOW, true ) )
109     {
110         msg_Err( p_playlist, "cannot spawn secondary preparse thread" );
111         vlc_object_release( p_playlist->p->p_fetcher );
112         return;
113     }
114
115     // Start the thread
116     if( vlc_thread_create( p_playlist, "playlist", RunControlThread,
117                            VLC_THREAD_PRIORITY_LOW, true ) )
118     {
119         msg_Err( p_playlist, "cannot spawn playlist thread" );
120         vlc_object_release( p_playlist );
121         return;
122     }
123
124     /* The object has been initialized, now attach it */
125     vlc_object_attach( p_playlist, p_parent );
126
127     return;
128 }
129
130 /**
131  * Run the main control thread itself
132  */
133 static void* RunControlThread ( vlc_object_t *p_this )
134 {
135     playlist_t *p_playlist = (playlist_t*)p_this;
136     /* Tell above that we're ready */
137     vlc_thread_ready( p_playlist );
138
139     int canc = vlc_savecancel ();
140     vlc_object_lock( p_playlist );
141     while( vlc_object_alive( p_playlist ) )
142     {
143         playlist_MainLoop( p_playlist );
144
145         /* The playlist lock has been unlocked, so we can't tell if
146          * someone has killed us in the meantime. Check now. */
147         if( !vlc_object_alive( p_playlist ) )
148             break;
149
150         if( p_playlist->b_cant_sleep )
151         {
152             /* 100 ms is an acceptable delay for playlist operations */
153             vlc_object_unlock( p_playlist );
154
155             msleep( INTF_IDLE_SLEEP*2 );
156
157             vlc_object_lock( p_playlist );
158         }
159         else
160         {
161             vlc_object_wait( p_playlist );
162         }
163     }
164     vlc_object_unlock( p_playlist );
165
166     playlist_LastLoop( p_playlist );
167     vlc_restorecancel (canc);
168     return NULL;
169 }
170
171 /*****************************************************************************
172  * Preparse-specific functions
173  *****************************************************************************/
174 static void* RunPreparse ( vlc_object_t *p_this )
175 {
176     playlist_preparse_t *p_obj = (playlist_preparse_t*)p_this;
177     int canc;
178
179     /* Tell above that we're ready */
180     vlc_thread_ready( p_obj );
181     canc = vlc_savecancel ();
182     playlist_PreparseLoop( p_obj );
183     vlc_restorecancel (canc);
184     return NULL;
185 }
186
187 static void* RunFetcher( vlc_object_t *p_this )
188 {
189     playlist_fetcher_t *p_obj = (playlist_fetcher_t *)p_this;
190     /* Tell above that we're ready */
191     vlc_thread_ready( p_obj );
192     int canc = vlc_savecancel ();
193     playlist_FetcherLoop( p_obj );
194     vlc_restorecancel (canc);
195     return NULL;
196 }
197
198 static void PreparseDestructor( vlc_object_t * p_this )
199 {
200     playlist_preparse_t * p_preparse = (playlist_preparse_t *)p_this;
201     free( p_preparse->pp_waiting );
202     msg_Dbg( p_this, "Destroyed" );
203 }
204
205 static void FetcherDestructor( vlc_object_t * p_this )
206 {
207     playlist_fetcher_t * p_fetcher = (playlist_fetcher_t *)p_this;
208     free( p_fetcher->pp_waiting );
209     msg_Dbg( p_this, "Destroyed" );
210 }