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
  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     // Stats
  60     p_playlist->p_stats = (global_stats_t *)malloc( sizeof( global_stats_t ) );
  61     if( !p_playlist->p_stats )
  62     {
  63         vlc_object_release( p_playlist );
  64         return;
  65     }
  66     vlc_mutex_init( p_playlist, &p_playlist->p_stats->lock );
  67     p_playlist->p_stats_computer = NULL;
  68
  69     // Preparse
  70     p_playlist->p_preparse = vlc_object_create( p_playlist,
  71                                   sizeof( playlist_preparse_t ) );
  72     if( !p_playlist->p_preparse )
  73     {
  74         msg_Err( p_playlist, "unable to create preparser" );
  75         vlc_object_release( p_playlist );
  76         return;
  77     }
  78     p_playlist->p_preparse->i_waiting = 0;
  79     p_playlist->p_preparse->pp_waiting = NULL;
  80
  81     vlc_object_attach( p_playlist->p_preparse, p_playlist );
  82     if( vlc_thread_create( p_playlist->p_preparse, "preparser",
  83                            RunPreparse, VLC_THREAD_PRIORITY_LOW, VLC_TRUE ) )
  84     {
  85         msg_Err( p_playlist, "cannot spawn preparse thread" );
  86         vlc_object_detach( p_playlist->p_preparse );
  87         vlc_object_release( p_playlist->p_preparse );
  88         return;
  89     }
  90
  91     // Secondary Preparse
  92     p_playlist->p_fetcher = vlc_object_create( p_playlist,
  93                               sizeof( playlist_fetcher_t ) );
  94     if( !p_playlist->p_fetcher )
  95     {
  96         msg_Err( p_playlist, "unable to create secondary preparser" );
  97         vlc_object_release( p_playlist );
  98         return;
  99     }
 100     p_playlist->p_fetcher->i_waiting = 0;
 101     p_playlist->p_fetcher->p_waiting = NULL;
 102     p_playlist->p_fetcher->b_fetch_meta = var_CreateGetInteger( p_playlist,
 103                                                                  "fetch-meta" );
 104     p_playlist->p_fetcher->i_art_policy = var_CreateGetInteger( p_playlist,
 105                                                                 "album-art" );
 106
 107     vlc_object_attach( p_playlist->p_fetcher, p_playlist );
 108     if( vlc_thread_create( p_playlist->p_fetcher,
 109                            "fetcher",
 110                            RunFetcher,
 111                            VLC_THREAD_PRIORITY_LOW, VLC_TRUE ) )
 112     {
 113         msg_Err( p_playlist, "cannot spawn secondary preparse thread" );
 114         vlc_object_detach( p_playlist->p_fetcher );
 115         vlc_object_release( p_playlist->p_fetcher );
 116         return;
 117     }
 118
 119     // Start the thread
 120     if( vlc_thread_create( p_playlist, "playlist", RunControlThread,
 121                            VLC_THREAD_PRIORITY_LOW, VLC_TRUE ) )
 122     {
 123         msg_Err( p_playlist, "cannot spawn playlist thread" );
 124         vlc_object_release( p_playlist );
 125         return;
 126     }
 127
 128     /* The object has been initialized, now attach it */
 129     vlc_object_attach( p_playlist, p_parent );
 130
 131     return;
 132 }
 133
 134 /**
 135  * Destroy the playlist global thread.
 136  *
 137  * Deinits all things controlled by the playlist global thread
 138  * \param p_playlist the playlist thread to destroy
 139  * \return VLC_SUCCESS or an error
 140  */
 141 int playlist_ThreadDestroy( playlist_t * p_playlist )
 142 {
 143     // Tell playlist to go to last loop
 144     vlc_object_kill( p_playlist );
 145
 146     // Kill preparser
 147     if( p_playlist->p_preparse )
 148     {
 149         vlc_object_kill( p_playlist->p_preparse );
 150         vlc_thread_join( p_playlist->p_preparse );
 151         free( p_playlist->p_preparse->pp_waiting );
 152         vlc_object_detach( p_playlist->p_preparse );
 153         vlc_object_release( p_playlist->p_preparse );
 154     }
 155
 156     // Kill meta fetcher
 157     if( p_playlist->p_fetcher )
 158     {
 159         vlc_object_kill( p_playlist->p_fetcher );
 160         vlc_thread_join( p_playlist->p_fetcher );
 161         free( p_playlist->p_fetcher->p_waiting );
 162         vlc_object_detach( p_playlist->p_fetcher );
 163         vlc_object_release( p_playlist->p_fetcher );
 164     }
 165
 166     // Wait for thread to complete
 167     vlc_thread_join( p_playlist );
 168
 169     // Stats
 170     vlc_mutex_destroy( &p_playlist->p_stats->lock );
 171     if( p_playlist->p_stats )
 172         free( p_playlist->p_stats );
 173
 174     playlist_Destroy( p_playlist );
 175
 176     return VLC_SUCCESS;
 177 }
 178
 179 /**
 180  * Run the main control thread itself
 181  */
 182 static void RunControlThread ( playlist_t *p_playlist )
 183 {
 184     int i_loops = 0;
 185
 186     /* Tell above that we're ready */
 187     vlc_thread_ready( p_playlist );
 188     while( !p_playlist->b_die )
 189     {
 190         i_loops++;
 191
 192         playlist_MainLoop( p_playlist );
 193         if( p_playlist->b_cant_sleep )
 194         {
 195             /* 100 ms is an acceptable delay for playlist operations */
 196             msleep( INTF_IDLE_SLEEP*2 );
 197         }
 198         else
 199         {
 200             PL_LOCK;
 201             vlc_cond_wait( &p_playlist->object_wait, &p_playlist->object_lock );
 202             PL_UNLOCK;
 203         }
 204     }
 205     playlist_LastLoop( p_playlist );
 206 }
 207
 208 /*****************************************************************************
 209  * Preparse-specific functions
 210  *****************************************************************************/
 211 static void RunPreparse ( playlist_preparse_t *p_obj )
 212 {
 213     /* Tell above that we're ready */
 214     vlc_thread_ready( p_obj );
 215     playlist_PreparseLoop( p_obj );
 216 }
 217
 218 static void RunFetcher( playlist_fetcher_t *p_obj )
 219 {
 220     /* Tell above that we're ready */
 221     vlc_thread_ready( p_obj );
 222     playlist_FetcherLoop( p_obj );
 223 }