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* RunFetcher         ( vlc_object_t * );
  40 static void FetcherDestructor   ( vlc_object_t * );
  41
  42 /*****************************************************************************
  43  * Main functions for the global thread
  44  *****************************************************************************/
  45
  46 /**
  47  * Create the main playlist thread
  48  * Additionally to the playlist, this thread controls :
  49  *    - Statistics
  50  *    - VLM
  51  * \param p_parent
  52  * \return an object with a started thread
  53  */
  54 void __playlist_ThreadCreate( vlc_object_t *p_parent )
  55 {
  56     playlist_t *p_playlist = playlist_Create( p_parent );
  57     if( !p_playlist ) return;
  58
  59     // Preparse
  60     playlist_preparse_t *p_preparse = &p_playlist->p->preparse;
  61     vlc_mutex_init (&p_preparse->lock);
  62     vlc_cond_init (&p_preparse->wait);
  63     p_preparse->i_waiting = 0;
  64     p_preparse->pp_waiting = NULL;
  65
  66     if( vlc_clone( &p_preparse->thread, playlist_PreparseLoop, p_preparse,
  67                    VLC_THREAD_PRIORITY_LOW ) )
  68     {
  69         msg_Err( p_playlist, "cannot spawn preparse thread" );
  70         p_preparse->up = false;
  71         return;
  72     }
  73     p_preparse->up = true;
  74
  75     // Secondary Preparse
  76     static const char fname[] = "fetcher";
  77     p_playlist->p->p_fetcher =
  78         vlc_custom_create( p_playlist, sizeof( playlist_fetcher_t ),
  79                            VLC_OBJECT_GENERIC, fname );
  80     if( !p_playlist->p->p_fetcher )
  81     {
  82         msg_Err( p_playlist, "unable to create secondary preparser" );
  83         vlc_object_release( p_playlist );
  84         return;
  85     }
  86     p_playlist->p->p_fetcher->i_waiting = 0;
  87     p_playlist->p->p_fetcher->pp_waiting = NULL;
  88     p_playlist->p->p_fetcher->i_art_policy = var_CreateGetInteger( p_playlist,
  89                                                                 "album-art" );
  90
  91     vlc_object_set_destructor( p_playlist->p->p_fetcher, FetcherDestructor );
  92
  93     vlc_object_attach( p_playlist->p->p_fetcher, p_playlist );
  94     if( vlc_thread_create( p_playlist->p->p_fetcher,
  95                            "fetcher",
  96                            RunFetcher,
  97                            VLC_THREAD_PRIORITY_LOW, false ) )
  98     {
  99         msg_Err( p_playlist, "cannot spawn secondary preparse thread" );
 100         vlc_object_release( p_playlist->p->p_fetcher );
 101         return;
 102     }
 103
 104     // Start the thread
 105     if( vlc_thread_create( p_playlist, "playlist", RunControlThread,
 106                            VLC_THREAD_PRIORITY_LOW, false ) )
 107     {
 108         msg_Err( p_playlist, "cannot spawn playlist thread" );
 109         vlc_object_release( p_playlist );
 110         return;
 111     }
 112
 113     /* The object has been initialized, now attach it */
 114     vlc_object_attach( p_playlist, p_parent );
 115
 116     return;
 117 }
 118
 119 /**
 120  * Run the main control thread itself
 121  */
 122 static void* RunControlThread ( vlc_object_t *p_this )
 123 {
 124     playlist_t *p_playlist = (playlist_t*)p_this;
 125
 126     int canc = vlc_savecancel ();
 127     vlc_object_lock( p_playlist );
 128     while( vlc_object_alive( p_playlist ) )
 129     {
 130         playlist_MainLoop( p_playlist );
 131
 132         /* The playlist lock has been unlocked, so we can't tell if
 133          * someone has killed us in the meantime. Check now. */
 134         if( !vlc_object_alive( p_playlist ) )
 135             break;
 136
 137         if( p_playlist->b_cant_sleep )
 138         {
 139             /* 100 ms is an acceptable delay for playlist operations */
 140             vlc_object_unlock( p_playlist );
 141
 142             msleep( INTF_IDLE_SLEEP*2 );
 143
 144             vlc_object_lock( p_playlist );
 145         }
 146         else
 147         {
 148             vlc_object_wait( p_playlist );
 149         }
 150     }
 151     vlc_object_unlock( p_playlist );
 152
 153     playlist_LastLoop( p_playlist );
 154     vlc_restorecancel (canc);
 155     return NULL;
 156 }
 157
 158 static void* RunFetcher( vlc_object_t *p_this )
 159 {
 160     playlist_fetcher_t *p_obj = (playlist_fetcher_t *)p_this;
 161     int canc = vlc_savecancel ();
 162     playlist_FetcherLoop( p_obj );
 163     vlc_restorecancel (canc);
 164     return NULL;
 165 }
 166
 167 static void FetcherDestructor( vlc_object_t * p_this )
 168 {
 169     playlist_fetcher_t * p_fetcher = (playlist_fetcher_t *)p_this;
 170     free( p_fetcher->pp_waiting );
 171     msg_Dbg( p_this, "Destroyed" );
 172 }