git.sesse.net Git - vlc/blob - 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, false ) )
  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, false ) )
 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, false ) )
 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
 137     int canc = vlc_savecancel ();
 138     vlc_object_lock( p_playlist );
 139     while( vlc_object_alive( p_playlist ) )
 140     {
 141         playlist_MainLoop( p_playlist );
 142
 143         /* The playlist lock has been unlocked, so we can't tell if
 144          * someone has killed us in the meantime. Check now. */
 145         if( !vlc_object_alive( p_playlist ) )
 146             break;
 147
 148         if( p_playlist->b_cant_sleep )
 149         {
 150             /* 100 ms is an acceptable delay for playlist operations */
 151             vlc_object_unlock( p_playlist );
 152
 153             msleep( INTF_IDLE_SLEEP*2 );
 154
 155             vlc_object_lock( p_playlist );
 156         }
 157         else
 158         {
 159             vlc_object_wait( p_playlist );
 160         }
 161     }
 162     vlc_object_unlock( p_playlist );
 163
 164     playlist_LastLoop( p_playlist );
 165     vlc_restorecancel (canc);
 166     return NULL;
 167 }
 168
 169 /*****************************************************************************
 170  * Preparse-specific functions
 171  *****************************************************************************/
 172 static void* RunPreparse ( vlc_object_t *p_this )
 173 {
 174     playlist_preparse_t *p_obj = (playlist_preparse_t*)p_this;
 175     int canc;
 176
 177     canc = vlc_savecancel ();
 178     playlist_PreparseLoop( p_obj );
 179     vlc_restorecancel (canc);
 180     return NULL;
 181 }
 182
 183 static void* RunFetcher( vlc_object_t *p_this )
 184 {
 185     playlist_fetcher_t *p_obj = (playlist_fetcher_t *)p_this;
 186     int canc = vlc_savecancel ();
 187     playlist_FetcherLoop( p_obj );
 188     vlc_restorecancel (canc);
 189     return NULL;
 190 }
 191
 192 static void PreparseDestructor( vlc_object_t * p_this )
 193 {
 194     playlist_preparse_t * p_preparse = (playlist_preparse_t *)p_this;
 195     free( p_preparse->pp_waiting );
 196     msg_Dbg( p_this, "Destroyed" );
 197 }
 198
 199 static void FetcherDestructor( vlc_object_t * p_this )
 200 {
 201     playlist_fetcher_t * p_fetcher = (playlist_fetcher_t *)p_this;
 202     free( p_fetcher->pp_waiting );
 203     msg_Dbg( p_this, "Destroyed" );
 204 }