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 ( 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     if( !p_playlist->p_preparse )
  65     {
  66         msg_Err( p_playlist, "unable to create preparser" );
  67         vlc_object_release( p_playlist );
  68         return;
  69     }
  70     p_playlist->p_preparse->psz_object_name = strdup( "preparser" );
  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, 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     if( !p_playlist->p_fetcher )
  89     {
  90         msg_Err( p_playlist, "unable to create secondary preparser" );
  91         vlc_object_release( p_playlist );
  92         return;
  93     }
  94     p_playlist->p_fetcher->psz_object_name = strdup( "fetcher" );
  95     p_playlist->p_fetcher->i_waiting = 0;
  96     p_playlist->p_fetcher->pp_waiting = NULL;
  97     p_playlist->p_fetcher->i_art_policy = var_CreateGetInteger( p_playlist,
  98                                                                 "album-art" );
  99
 100     vlc_object_set_destructor( p_playlist->p_fetcher, FetcherDestructor );
 101
 102     vlc_object_attach( p_playlist->p_fetcher, p_playlist );
 103     if( vlc_thread_create( p_playlist->p_fetcher,
 104                            "fetcher",
 105                            RunFetcher,
 106                            VLC_THREAD_PRIORITY_LOW, true ) )
 107     {
 108         msg_Err( p_playlist, "cannot spawn secondary preparse thread" );
 109         vlc_object_release( p_playlist->p_fetcher );
 110         return;
 111     }
 112
 113     // Start the thread
 114     if( vlc_thread_create( p_playlist, "playlist", RunControlThread,
 115                            VLC_THREAD_PRIORITY_LOW, true ) )
 116     {
 117         msg_Err( p_playlist, "cannot spawn playlist thread" );
 118         vlc_object_release( p_playlist );
 119         return;
 120     }
 121
 122     /* The object has been initialized, now attach it */
 123     vlc_object_attach( p_playlist, p_parent );
 124
 125     return;
 126 }
 127
 128 /**
 129  * Run the main control thread itself
 130  */
 131 static void RunControlThread ( playlist_t *p_playlist )
 132 {
 133     /* Tell above that we're ready */
 134     vlc_thread_ready( p_playlist );
 135
 136     vlc_object_lock( p_playlist );
 137     while( vlc_object_alive( p_playlist ) )
 138     {
 139         PL_UNLOCK;
 140         playlist_MainLoop( p_playlist );
 141         PL_LOCK;
 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             PL_UNLOCK;
 152             msleep( INTF_IDLE_SLEEP*2 );
 153             PL_LOCK;
 154         }
 155         else
 156         {
 157             vlc_object_wait( p_playlist );
 158         }
 159     }
 160     vlc_object_unlock( p_playlist );
 161
 162     playlist_LastLoop( p_playlist );
 163 }
 164
 165 /*****************************************************************************
 166  * Preparse-specific functions
 167  *****************************************************************************/
 168 static void RunPreparse ( playlist_preparse_t *p_obj )
 169 {
 170     /* Tell above that we're ready */
 171     vlc_thread_ready( p_obj );
 172     playlist_PreparseLoop( p_obj );
 173 }
 174
 175 static void RunFetcher( playlist_fetcher_t *p_obj )
 176 {
 177     /* Tell above that we're ready */
 178     vlc_thread_ready( p_obj );
 179     playlist_FetcherLoop( p_obj );
 180 }
 181
 182 static void PreparseDestructor( vlc_object_t * p_this )
 183 {
 184     playlist_preparse_t * p_preparse = (playlist_preparse_t *)p_this;
 185     free( p_preparse->pp_waiting );
 186 }
 187
 188 static void FetcherDestructor( vlc_object_t * p_this )
 189 {
 190     playlist_fetcher_t * p_fetcher = (playlist_fetcher_t *)p_this;
 191     free( p_fetcher->pp_waiting );
 192 }