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_preparse =
  64         vlc_custom_create( p_playlist, sizeof( playlist_preparse_t ),
  65                            VLC_OBJECT_GENERIC, ppname );
  66     if( !p_playlist->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_preparse->psz_object_name = strdup( "preparser" );
  73     p_playlist->p_preparse->i_waiting = 0;
  74     p_playlist->p_preparse->pp_waiting = NULL;
  75
  76     vlc_object_set_destructor( p_playlist->p_preparse, PreparseDestructor );
  77
  78     vlc_object_attach( p_playlist->p_preparse, p_playlist );
  79     if( vlc_thread_create( p_playlist->p_preparse, "preparser",
  80                            RunPreparse, VLC_THREAD_PRIORITY_LOW, true ) )
  81     {
  82         msg_Err( p_playlist, "cannot spawn preparse thread" );
  83         vlc_object_release( p_playlist->p_preparse );
  84         return;
  85     }
  86
  87     // Secondary Preparse
  88     static const char fname[] = "fetcher";
  89     p_playlist->p_fetcher =
  90         vlc_custom_create( p_playlist, sizeof( playlist_fetcher_t ),
  91                            VLC_OBJECT_GENERIC, fname );
  92     if( !p_playlist->p_fetcher )
  93     {
  94         msg_Err( p_playlist, "unable to create secondary preparser" );
  95         vlc_object_release( p_playlist );
  96         return;
  97     }
  98     p_playlist->p_fetcher->psz_object_name = strdup( "fetcher" );
  99     p_playlist->p_fetcher->i_waiting = 0;
 100     p_playlist->p_fetcher->pp_waiting = NULL;
 101     p_playlist->p_fetcher->i_art_policy = var_CreateGetInteger( p_playlist,
 102                                                                 "album-art" );
 103
 104     vlc_object_set_destructor( p_playlist->p_fetcher, FetcherDestructor );
 105
 106     vlc_object_attach( p_playlist->p_fetcher, p_playlist );
 107     if( vlc_thread_create( p_playlist->p_fetcher,
 108                            "fetcher",
 109                            RunFetcher,
 110                            VLC_THREAD_PRIORITY_LOW, true ) )
 111     {
 112         msg_Err( p_playlist, "cannot spawn secondary preparse thread" );
 113         vlc_object_release( p_playlist->p_fetcher );
 114         return;
 115     }
 116
 117     // Start the thread
 118     if( vlc_thread_create( p_playlist, "playlist", RunControlThread,
 119                            VLC_THREAD_PRIORITY_LOW, true ) )
 120     {
 121         msg_Err( p_playlist, "cannot spawn playlist thread" );
 122         vlc_object_release( p_playlist );
 123         return;
 124     }
 125
 126     /* The object has been initialized, now attach it */
 127     vlc_object_attach( p_playlist, p_parent );
 128
 129     return;
 130 }
 131
 132 /**
 133  * Run the main control thread itself
 134  */
 135 static void* RunControlThread ( vlc_object_t *p_this )
 136 {
 137     playlist_t *p_playlist = (playlist_t*)p_this;
 138     /* Tell above that we're ready */
 139     vlc_thread_ready( p_playlist );
 140
 141     int canc = vlc_savecancel ();
 142     vlc_object_lock( p_playlist );
 143     while( vlc_object_alive( p_playlist ) )
 144     {
 145         playlist_MainLoop( p_playlist );
 146
 147         /* The playlist lock has been unlocked, so we can't tell if
 148          * someone has killed us in the meantime. Check now. */
 149         if( !vlc_object_alive( p_playlist ) )
 150             break;
 151
 152         if( p_playlist->b_cant_sleep )
 153         {
 154             /* 100 ms is an acceptable delay for playlist operations */
 155             vlc_object_unlock( p_playlist );
 156
 157             msleep( INTF_IDLE_SLEEP*2 );
 158
 159             vlc_object_lock( p_playlist );
 160         }
 161         else
 162         {
 163             vlc_object_wait( p_playlist );
 164         }
 165     }
 166     vlc_object_unlock( p_playlist );
 167
 168     playlist_LastLoop( p_playlist );
 169     vlc_restorecancel (canc);
 170     return NULL;
 171 }
 172
 173 /*****************************************************************************
 174  * Preparse-specific functions
 175  *****************************************************************************/
 176 static void* RunPreparse ( vlc_object_t *p_this )
 177 {
 178     playlist_preparse_t *p_obj = (playlist_preparse_t*)p_this;
 179     int canc;
 180
 181     /* Tell above that we're ready */
 182     vlc_thread_ready( p_obj );
 183     canc = vlc_savecancel ();
 184     playlist_PreparseLoop( p_obj );
 185     vlc_restorecancel (canc);
 186     return NULL;
 187 }
 188
 189 static void* RunFetcher( vlc_object_t *p_this )
 190 {
 191     playlist_fetcher_t *p_obj = (playlist_fetcher_t *)p_this;
 192     /* Tell above that we're ready */
 193     vlc_thread_ready( p_obj );
 194     int canc = vlc_savecancel ();
 195     playlist_FetcherLoop( p_obj );
 196     vlc_restorecancel (canc);
 197     return NULL;
 198 }
 199
 200 static void PreparseDestructor( vlc_object_t * p_this )
 201 {
 202     playlist_preparse_t * p_preparse = (playlist_preparse_t *)p_this;
 203     free( p_preparse->pp_waiting );
 204     msg_Dbg( p_this, "Destroyed" );
 205 }
 206
 207 static void FetcherDestructor( vlc_object_t * p_this )
 208 {
 209     playlist_fetcher_t * p_fetcher = (playlist_fetcher_t *)p_this;
 210     free( p_fetcher->pp_waiting );
 211     msg_Dbg( p_this, "Destroyed" );
 212 }