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/vlc.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 ( playlist_t * );
  39 static void RunPreparse( playlist_preparse_t * );
  40 static void RunFetcher( playlist_fetcher_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     p_playlist->p_preparse = vlc_object_create( p_playlist,
  63                                   sizeof( playlist_preparse_t ) );
  64     p_playlist->p_preparse->psz_object_name = "preparser";
  65     if( !p_playlist->p_preparse )
  66     {
  67         msg_Err( p_playlist, "unable to create preparser" );
  68         vlc_object_release( p_playlist );
  69         return;
  70     }
  71     p_playlist->p_preparse->i_waiting = 0;
  72     p_playlist->p_preparse->pp_waiting = NULL;
  73
  74     vlc_object_set_destructor( p_playlist->p_preparse, PreparseDestructor );
  75
  76     vlc_object_attach( p_playlist->p_preparse, p_playlist );
  77     if( vlc_thread_create( p_playlist->p_preparse, "preparser",
  78                            RunPreparse, VLC_THREAD_PRIORITY_LOW, VLC_TRUE ) )
  79     {
  80         msg_Err( p_playlist, "cannot spawn preparse thread" );
  81         vlc_object_release( p_playlist->p_preparse );
  82         return;
  83     }
  84
  85     // Secondary Preparse
  86     p_playlist->p_fetcher = vlc_object_create( p_playlist,
  87                               sizeof( playlist_fetcher_t ) );
  88     p_playlist->p_fetcher->psz_object_name = "fetcher";
  89     if( !p_playlist->p_fetcher )
  90     {
  91         msg_Err( p_playlist, "unable to create secondary preparser" );
  92         vlc_object_release( p_playlist );
  93         return;
  94     }
  95     p_playlist->p_fetcher->i_waiting = 0;
  96     p_playlist->p_fetcher->p_waiting = NULL;
  97     p_playlist->p_fetcher->b_fetch_meta = var_CreateGetInteger( p_playlist,
  98                                                                  "fetch-meta" );
  99     p_playlist->p_fetcher->i_art_policy = var_CreateGetInteger( p_playlist,
 100                                                                 "album-art" );
 101
 102     vlc_object_set_destructor( p_playlist->p_fetcher, FetcherDestructor );
 103
 104     vlc_object_attach( p_playlist->p_fetcher, p_playlist );
 105     if( vlc_thread_create( p_playlist->p_fetcher,
 106                            "fetcher",
 107                            RunFetcher,
 108                            VLC_THREAD_PRIORITY_LOW, VLC_TRUE ) )
 109     {
 110         msg_Err( p_playlist, "cannot spawn secondary preparse thread" );
 111         vlc_object_release( p_playlist->p_fetcher );
 112         return;
 113     }
 114
 115     // Start the thread
 116     if( vlc_thread_create( p_playlist, "playlist", RunControlThread,
 117                            VLC_THREAD_PRIORITY_LOW, VLC_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  * Destroy the playlist global thread.
 132  *
 133  * Deinits all things controlled by the playlist global thread
 134  * \param p_playlist the playlist thread to destroy
 135  * \return VLC_SUCCESS or an error
 136  */
 137 int playlist_ThreadDestroy( playlist_t * p_playlist )
 138 {
 139     playlist_Destroy( p_playlist );
 140     return VLC_SUCCESS;
 141 }
 142
 143 /**
 144  * Run the main control thread itself
 145  */
 146 static void RunControlThread ( playlist_t *p_playlist )
 147 {
 148     /* Tell above that we're ready */
 149     vlc_thread_ready( p_playlist );
 150
 151     vlc_object_lock( p_playlist );
 152     while( vlc_object_alive( p_playlist ) )
 153     {
 154         PL_UNLOCK;
 155         playlist_MainLoop( p_playlist );
 156         PL_LOCK;
 157
 158         /* The playlist lock has been unlocked, so we can't tell if
 159          * someone has killed us in the meantime. Check now. */
 160         if( !vlc_object_alive( p_playlist ) )
 161             break;
 162
 163         if( p_playlist->b_cant_sleep )
 164         {
 165             /* 100 ms is an acceptable delay for playlist operations */
 166             PL_UNLOCK;
 167             msleep( INTF_IDLE_SLEEP*2 );
 168             PL_LOCK;
 169         }
 170         else
 171         {
 172             vlc_object_wait( p_playlist );
 173         }
 174     }
 175     vlc_object_unlock( p_playlist );
 176
 177     playlist_LastLoop( p_playlist );
 178 }
 179
 180 /*****************************************************************************
 181  * Preparse-specific functions
 182  *****************************************************************************/
 183 static void RunPreparse ( playlist_preparse_t *p_obj )
 184 {
 185     /* Tell above that we're ready */
 186     vlc_thread_ready( p_obj );
 187     playlist_PreparseLoop( p_obj );
 188 }
 189
 190 static void RunFetcher( playlist_fetcher_t *p_obj )
 191 {
 192     /* Tell above that we're ready */
 193     vlc_thread_ready( p_obj );
 194     playlist_FetcherLoop( p_obj );
 195 }
 196
 197 static void PreparseDestructor( vlc_object_t * p_this )
 198 {
 199     playlist_preparse_t * p_preparse = (playlist_preparse_t *)p_this;
 200     free( p_preparse->pp_waiting );
 201 }
 202
 203 static void FetcherDestructor( vlc_object_t * p_this )
 204 {
 205     playlist_fetcher_t * p_fetcher = (playlist_fetcher_t *)p_this;
 206     free( p_fetcher->p_waiting );
 207 }