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     // Stats
  62     p_playlist->p_stats = (global_stats_t *)malloc( sizeof( global_stats_t ) );
  63     if( !p_playlist->p_stats )
  64     {
  65         vlc_object_release( p_playlist );
  66         return;
  67     }
  68     vlc_mutex_init( p_playlist, &p_playlist->p_stats->lock );
  69     p_playlist->p_stats_computer = NULL;
  70
  71     // Preparse
  72     p_playlist->p_preparse = vlc_object_create( p_playlist,
  73                                   sizeof( playlist_preparse_t ) );
  74     if( !p_playlist->p_preparse )
  75     {
  76         msg_Err( p_playlist, "unable to create preparser" );
  77         vlc_object_release( p_playlist );
  78         return;
  79     }
  80     p_playlist->p_preparse->i_waiting = 0;
  81     p_playlist->p_preparse->pp_waiting = NULL;
  82
  83     vlc_object_set_destructor( p_playlist->p_preparse, PreparseDestructor );
  84
  85     vlc_object_attach( p_playlist->p_preparse, p_playlist );
  86     if( vlc_thread_create( p_playlist->p_preparse, "preparser",
  87                            RunPreparse, VLC_THREAD_PRIORITY_LOW, VLC_TRUE ) )
  88     {
  89         msg_Err( p_playlist, "cannot spawn preparse thread" );
  90         vlc_object_release( p_playlist->p_preparse );
  91         return;
  92     }
  93
  94     // Secondary Preparse
  95     p_playlist->p_fetcher = vlc_object_create( p_playlist,
  96                               sizeof( playlist_fetcher_t ) );
  97     if( !p_playlist->p_fetcher )
  98     {
  99         msg_Err( p_playlist, "unable to create secondary preparser" );
 100         vlc_object_release( p_playlist );
 101         return;
 102     }
 103     p_playlist->p_fetcher->i_waiting = 0;
 104     p_playlist->p_fetcher->p_waiting = NULL;
 105     p_playlist->p_fetcher->b_fetch_meta = var_CreateGetInteger( p_playlist,
 106                                                                  "fetch-meta" );
 107     p_playlist->p_fetcher->i_art_policy = var_CreateGetInteger( p_playlist,
 108                                                                 "album-art" );
 109
 110     vlc_object_set_destructor( p_playlist->p_fetcher, FetcherDestructor );
 111
 112     vlc_object_attach( p_playlist->p_fetcher, p_playlist );
 113     if( vlc_thread_create( p_playlist->p_fetcher,
 114                            "fetcher",
 115                            RunFetcher,
 116                            VLC_THREAD_PRIORITY_LOW, VLC_TRUE ) )
 117     {
 118         msg_Err( p_playlist, "cannot spawn secondary preparse thread" );
 119         vlc_object_release( p_playlist->p_fetcher );
 120         return;
 121     }
 122
 123     // Start the thread
 124     if( vlc_thread_create( p_playlist, "playlist", RunControlThread,
 125                            VLC_THREAD_PRIORITY_LOW, VLC_TRUE ) )
 126     {
 127         msg_Err( p_playlist, "cannot spawn playlist thread" );
 128         vlc_object_release( p_playlist );
 129         return;
 130     }
 131
 132     /* The object has been initialized, now attach it */
 133     vlc_object_attach( p_playlist, p_parent );
 134
 135     return;
 136 }
 137
 138 /**
 139  * Destroy the playlist global thread.
 140  *
 141  * Deinits all things controlled by the playlist global thread
 142  * \param p_playlist the playlist thread to destroy
 143  * \return VLC_SUCCESS or an error
 144  */
 145 int playlist_ThreadDestroy( playlist_t * p_playlist )
 146 {
 147     // Tell playlist to go to last loop
 148     vlc_object_kill( p_playlist );
 149
 150     // Kill preparser
 151     if( p_playlist->p_preparse )
 152     {
 153         vlc_object_release( p_playlist->p_preparse );
 154     }
 155
 156     // Kill meta fetcher
 157     if( p_playlist->p_fetcher )
 158     {
 159         vlc_object_release( p_playlist->p_fetcher );
 160     }
 161
 162     // Wait for thread to complete
 163     vlc_thread_join( p_playlist );
 164
 165     // Stats
 166     vlc_mutex_destroy( &p_playlist->p_stats->lock );
 167     if( p_playlist->p_stats )
 168         free( p_playlist->p_stats );
 169
 170     playlist_Destroy( p_playlist );
 171
 172     return VLC_SUCCESS;
 173 }
 174
 175 /**
 176  * Run the main control thread itself
 177  */
 178 static void RunControlThread ( playlist_t *p_playlist )
 179 {
 180     int i_loops = 0;
 181
 182     /* Tell above that we're ready */
 183     vlc_thread_ready( p_playlist );
 184     while( !p_playlist->b_die )
 185     {
 186         i_loops++;
 187
 188         playlist_MainLoop( p_playlist );
 189         if( p_playlist->b_cant_sleep )
 190         {
 191             /* 100 ms is an acceptable delay for playlist operations */
 192             msleep( INTF_IDLE_SLEEP*2 );
 193         }
 194         else
 195         {
 196             PL_LOCK;
 197             vlc_cond_wait( &p_playlist->object_wait, &p_playlist->object_lock );
 198             PL_UNLOCK;
 199         }
 200     }
 201     playlist_LastLoop( p_playlist );
 202 }
 203
 204 /*****************************************************************************
 205  * Preparse-specific functions
 206  *****************************************************************************/
 207 static void RunPreparse ( playlist_preparse_t *p_obj )
 208 {
 209     /* Tell above that we're ready */
 210     vlc_thread_ready( p_obj );
 211     playlist_PreparseLoop( p_obj );
 212 }
 213
 214 static void RunFetcher( playlist_fetcher_t *p_obj )
 215 {
 216     /* Tell above that we're ready */
 217     vlc_thread_ready( p_obj );
 218     playlist_FetcherLoop( p_obj );
 219 }
 220
 221 static void PreparseDestructor( vlc_object_t * p_this )
 222 {
 223     playlist_preparse_t * p_preparse = (playlist_preparse_t *)p_this;
 224     free( p_preparse->pp_waiting );
 225 }
 226
 227 static void FetcherDestructor( vlc_object_t * p_this )
 228 {
 229     playlist_fetcher_t * p_fetcher = (playlist_fetcher_t *)p_this;
 230     free( p_fetcher->p_waiting );
 231 }