src/playlist/thread.c

   1 /*****************************************************************************
   2  * playlist.c : Playlist management functions
   3  *****************************************************************************
   4  * Copyright (C) 1999-2004 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 #include <vlc/vlc.h>
  25 #include <vlc_es.h>
  26 #include <vlc_input.h>
  27 #include "vlc_playlist.h"
  28 #include "vlc_interaction.h"
  29 #include "playlist_internal.h"
  30
  31 /*****************************************************************************
  32  * Local prototypes
  33  *****************************************************************************/
  34 static void RunControlThread ( playlist_t * );
  35 static void RunPreparse( playlist_preparse_t * );
  36 static void RunFetcher( playlist_fetcher_t * );
  37
  38 static playlist_t * CreatePlaylist( vlc_object_t *p_parent );
  39 static void EndPlaylist( playlist_t * );
  40 static void DestroyPlaylist( playlist_t * );
  41
  42 static void DestroyInteraction( playlist_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  *    - Interaction
  52  *    - Statistics
  53  *    - VLM
  54  * \param p_parent
  55  * \return an object with a started thread
  56  */
  57 void __playlist_ThreadCreate( vlc_object_t *p_parent )
  58 {
  59     playlist_t *p_playlist;
  60     p_playlist = CreatePlaylist( p_parent );
  61
  62     if( !p_playlist ) return;
  63
  64     // Stats
  65     p_playlist->p_stats = (global_stats_t *)malloc( sizeof( global_stats_t ) );
  66     vlc_mutex_init( p_playlist, &p_playlist->p_stats->lock );
  67     p_playlist->p_stats_computer = NULL;
  68
  69     // Interaction
  70     p_playlist->p_interaction = NULL;
  71
  72     // Preparse
  73     p_playlist->p_preparse = vlc_object_create( p_playlist,
  74                                   sizeof( playlist_preparse_t ) );
  75     if( !p_playlist->p_preparse )
  76     {
  77         msg_Err( p_playlist, "unable to create preparser" );
  78         vlc_object_destroy( p_playlist );
  79         return;
  80     }
  81     p_playlist->p_preparse->i_waiting = 0;
  82     p_playlist->p_preparse->pp_waiting = NULL;
  83
  84     vlc_object_attach( p_playlist->p_preparse, p_playlist );
  85     if( vlc_thread_create( p_playlist->p_preparse, "preparser",
  86                            RunPreparse, VLC_THREAD_PRIORITY_LOW, VLC_TRUE ) )
  87     {
  88         msg_Err( p_playlist, "cannot spawn preparse thread" );
  89         vlc_object_detach( p_playlist->p_preparse );
  90         vlc_object_destroy( 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_destroy( 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->i_art_policy = var_CreateGetInteger( p_playlist,
 106                                                                 "album-art" );
 107
 108     vlc_object_attach( p_playlist->p_fetcher, p_playlist );
 109     if( vlc_thread_create( p_playlist->p_fetcher,
 110                            "fetcher",
 111                            RunFetcher,
 112                            VLC_THREAD_PRIORITY_LOW, VLC_TRUE ) )
 113     {
 114         msg_Err( p_playlist, "cannot spawn secondary preparse thread" );
 115         vlc_object_detach( p_playlist->p_fetcher );
 116         vlc_object_destroy( p_playlist->p_fetcher );
 117         return;
 118     }
 119
 120     // Start the thread
 121     if( vlc_thread_create( p_playlist, "playlist", RunControlThread,
 122                            VLC_THREAD_PRIORITY_LOW, VLC_TRUE ) )
 123     {
 124         msg_Err( p_playlist, "cannot spawn playlist thread" );
 125         vlc_object_destroy( p_playlist );
 126         return;
 127     }
 128
 129     /* The object has been initialized, now attach it */
 130     vlc_object_attach( p_playlist, p_parent );
 131
 132     return;
 133 }
 134
 135 /**
 136  * Destroy the playlist global thread.
 137  *
 138  * Deinits all things controlled by the playlist global thread
 139  * \param p_playlist the playlist thread to destroy
 140  * \return VLC_SUCCESS or an error
 141  */
 142 int playlist_ThreadDestroy( playlist_t * p_playlist )
 143 {
 144     p_playlist->b_die = VLC_TRUE;
 145     playlist_Signal( p_playlist );
 146     if( p_playlist->p_preparse )
 147     {
 148         vlc_cond_signal( &p_playlist->p_preparse->object_wait );
 149         free( p_playlist->p_preparse->pp_waiting );
 150     }
 151     if( p_playlist->p_fetcher )
 152     {
 153         vlc_cond_signal( &p_playlist->p_fetcher->object_wait );
 154         free( p_playlist->p_fetcher->p_waiting );
 155     }
 156
 157     DestroyInteraction( p_playlist );
 158     DestroyPlaylist( p_playlist );
 159
 160     return VLC_SUCCESS;
 161 }
 162
 163 /**
 164  * Run the main control thread itself
 165  */
 166 static void RunControlThread ( playlist_t *p_playlist )
 167 {
 168    int i_loops = 0;
 169
 170    /* Tell above that we're ready */
 171    vlc_thread_ready( p_playlist );
 172
 173     while( !p_playlist->b_die )
 174     {
 175         i_loops++;
 176
 177         if( p_playlist->p_interaction )
 178             intf_InteractionManage( p_playlist );
 179
 180         playlist_MainLoop( p_playlist );
 181         if( p_playlist->b_cant_sleep )
 182         {
 183             /* 100 ms is an acceptable delay for playlist operations */
 184             msleep( INTF_IDLE_SLEEP*2 );
 185         }
 186         else
 187         {
 188             PL_LOCK;
 189             vlc_cond_wait( &p_playlist->object_wait, &p_playlist->object_lock );
 190             PL_UNLOCK;
 191         }
 192     }
 193
 194     EndPlaylist( p_playlist );
 195 }
 196
 197
 198 /*****************************************************************************
 199  * Playlist-specific functions
 200  *****************************************************************************/
 201 static playlist_t * CreatePlaylist( vlc_object_t *p_parent )
 202 {
 203     return playlist_Create( p_parent );
 204 }
 205
 206 static void DestroyPlaylist( playlist_t *p_playlist )
 207 {
 208     playlist_Destroy( p_playlist );
 209 }
 210
 211 static void EndPlaylist( playlist_t *p_playlist )
 212 {
 213     playlist_LastLoop( p_playlist );
 214 }
 215
 216 /*****************************************************************************
 217  * Preparse-specific functions
 218  *****************************************************************************/
 219 static void RunPreparse ( playlist_preparse_t *p_obj )
 220 {
 221     /* Tell above that we're ready */
 222     vlc_thread_ready( p_obj );
 223     playlist_PreparseLoop( p_obj );
 224 }
 225
 226 static void RunFetcher( playlist_fetcher_t *p_obj )
 227 {
 228     /* Tell above that we're ready */
 229     vlc_thread_ready( p_obj );
 230     playlist_FetcherLoop( p_obj );
 231 }
 232
 233 /*****************************************************************************
 234  * Interaction functions
 235  *****************************************************************************/
 236 static void DestroyInteraction( playlist_t *p_playlist )
 237 {
 238     if( p_playlist->p_interaction )
 239     {
 240         intf_InteractionDestroy( p_playlist->p_interaction );
 241         fprintf( stderr, "NOW NULL ****\n" );
 242         p_playlist->p_interaction = NULL;
 243     }
 244 }