git.sesse.net Git - vlc/blob - modules/misc/screensaver.c

   1 /*****************************************************************************
   2  * screensaver.c : disable screen savers when VLC is playing
   3  *****************************************************************************
   4  * Copyright (C) 2006 the VideoLAN team
   5  * $Id$
   6  *
   7  * Authors: Sam Hocevar <sam@zoy.org>
   8  *          Benjamin Pracht <bigben AT videolan DOT 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
  25 /*****************************************************************************
  26  * Preamble
  27  *****************************************************************************/
  28
  29 #include <vlc/vlc.h>
  30 #include <vlc_input.h>
  31 #include <vlc_interface.h>
  32 #include <vlc_aout.h>
  33 #include <vlc_vout.h>
  34
  35 #ifdef HAVE_DBUS
  36
  37 #define DBUS_API_SUBJECT_TO_CHANGE
  38 #include <dbus/dbus.h>
  39
  40 #define GS_SERVICE   "org.gnome.ScreenSaver"
  41 #define GS_PATH      "/org/gnome/ScreenSaver"
  42 #define GS_INTERFACE "org.gnome.ScreenSaver"
  43
  44 #endif
  45
  46 /* this is for dbus < 0.3 */
  47 #ifndef HAVE_DBUS_1
  48 #define dbus_bus_name_has_owner(connection, name, err) dbus_bus_service_exists(connection, name, err)
  49 #endif
  50
  51 /*****************************************************************************
  52  * Local prototypes
  53  *****************************************************************************/
  54 static int  Activate     ( vlc_object_t * );
  55 static void  Deactivate   ( vlc_object_t * );
  56
  57 static void Run          ( intf_thread_t *p_intf );
  58
  59 #ifdef HAVE_DBUS
  60
  61 static DBusConnection * dbus_init( intf_thread_t *p_intf );
  62 static void poke_screensaver( intf_thread_t *p_intf,
  63                               DBusConnection *p_connection );
  64 static void screensaver_send_message_void ( intf_thread_t *p_intf,
  65                                        DBusConnection *p_connection,
  66                                        const char *psz_name );
  67 static vlc_bool_t screensaver_is_running( DBusConnection *p_connection );
  68
  69
  70 struct intf_sys_t
  71 {
  72     DBusConnection *p_connection;
  73 };
  74
  75 #endif
  76
  77 /*****************************************************************************
  78  * Module descriptor
  79  *****************************************************************************/
  80 vlc_module_begin();
  81     set_description( _("X Screensaver disabler") );
  82     set_capability( "interface", 0 );
  83     set_callbacks( Activate, Deactivate );
  84 vlc_module_end();
  85
  86 /*****************************************************************************
  87  * Activate: initialize and create stuff
  88  *****************************************************************************/
  89 static int Activate( vlc_object_t *p_this )
  90 {
  91     intf_thread_t *p_intf = (intf_thread_t*)p_this;
  92
  93     p_intf->pf_run = Run;
  94
  95 #ifdef HAVE_DBUS
  96     p_intf->p_sys = (intf_sys_t *)malloc( sizeof( intf_sys_t ) );
  97     if( !p_intf->p_sys ) return VLC_ENOMEM;
  98 #endif
  99
 100     return VLC_SUCCESS;
 101 }
 102
 103 /*****************************************************************************
 104  * Deactivate: uninitialize and cleanup
 105  *****************************************************************************/
 106 static void Deactivate( vlc_object_t *p_this )
 107 {
 108 #ifdef HAVE_DBUS
 109     intf_thread_t *p_intf = (intf_thread_t*)p_this;
 110
 111     if( p_intf->p_sys->p_connection )
 112     {
 113 #  ifdef HAVE_DBUS_2
 114         dbus_connection_unref( p_intf->p_sys->p_connection );
 115 #  else
 116         dbus_connection_disconnect( p_intf->p_sys->p_connection );
 117 #  endif
 118     }
 119
 120     if( p_intf->p_sys )
 121     {
 122         free( p_intf->p_sys );
 123         p_intf->p_sys = NULL;
 124     }
 125 #endif
 126 }
 127
 128
 129 /*****************************************************************************
 130  * Run: main thread
 131  *****************************************************************************
 132  * This part of the module is in a separate thread so that we do not have
 133  * too much system() overhead.
 134  *****************************************************************************/
 135 static void Run( intf_thread_t *p_intf )
 136 {
 137 #ifdef HAVE_DBUS
 138     p_intf->p_sys->p_connection = dbus_init( p_intf );
 139 #endif
 140
 141     for(;;)
 142     {
 143         vlc_object_t *p_vout;
 144         vlc_bool_t b_quit;
 145
 146         /* Check screensaver every 30 seconds */
 147         vlc_object_lock( p_intf );
 148         b_quit = vlc_object_timedwait( p_intf, mdate() + 30000000 ) < 0;
 149         vlc_object_unlock( p_intf );
 150
 151         if( b_quit )
 152             break;
 153
 154         p_vout = vlc_object_find( p_intf, VLC_OBJECT_VOUT, FIND_ANYWHERE );
 155
 156         /* If there is a video output, disable xscreensaver */
 157         if( p_vout )
 158         {
 159             input_thread_t *p_input;
 160             p_input = vlc_object_find( p_vout, VLC_OBJECT_INPUT, FIND_PARENT );
 161             vlc_object_release( p_vout );
 162             if( p_input )
 163             {
 164                 if( PLAYING_S == p_input->i_state )
 165                 {
 166                     /* http://www.jwz.org/xscreensaver/faq.html#dvd */
 167                     system( "xscreensaver-command -deactivate >&- 2>&- &" );
 168
 169                     /* If we have dbus support, let's communicate directly
 170                        with gnome-screensave else, run
 171                        gnome-screensaver-command */
 172 #ifdef HAVE_DBUS
 173                     poke_screensaver( p_intf, p_intf->p_sys->p_connection );
 174 #else
 175                     system( "gnome-screensaver-command --poke >&- 2>&- &" );
 176 #endif
 177                     /* FIXME: add support for other screensavers */
 178                 }
 179                 vlc_object_release( p_input );
 180             }
 181         }
 182     }
 183 }
 184
 185 #ifdef HAVE_DBUS
 186
 187 static DBusConnection * dbus_init( intf_thread_t *p_intf )
 188 {
 189     DBusError dbus_error;
 190
 191     dbus_error_init (&dbus_error);
 192     DBusConnection * p_connection = dbus_bus_get( DBUS_BUS_SESSION, &dbus_error );
 193
 194     if ( !p_connection )
 195     {
 196         msg_Warn( p_intf, "failed to connect to the D-BUS daemon: %s",
 197                           dbus_error.message);
 198         dbus_error_free( &dbus_error );
 199         return NULL;
 200     }
 201
 202     return p_connection;
 203 }
 204
 205 static void poke_screensaver( intf_thread_t *p_intf,
 206                               DBusConnection *p_connection )
 207 {
 208     if( screensaver_is_running( p_connection ) )
 209     {
 210 #   ifdef SCREENSAVER_DEBUG
 211         msg_Dbg( p_intf, "found a running gnome-screensaver instance" );
 212 #   endif
 213         /* gnome-screensaver changed it's D-Bus interface, so we need both */
 214         screensaver_send_message_void( p_intf, p_connection, "Poke" );
 215         screensaver_send_message_void( p_intf, p_connection,
 216                 "SimulateUserActivity" );
 217     }
 218 #   ifdef SCREENSAVER_DEBUG
 219     else
 220     {
 221         msg_Dbg( p_intf, "found no running gnome-screensaver instance" );
 222     }
 223 #   endif
 224 }
 225
 226 static void screensaver_send_message_void ( intf_thread_t *p_intf,
 227                                        DBusConnection *p_connection,
 228                                        const char *psz_name )
 229 {
 230     DBusMessage *p_message;
 231
 232     if( !p_connection || !psz_name ) return;
 233
 234     p_message = dbus_message_new_method_call( GS_SERVICE, GS_PATH,
 235                                               GS_INTERFACE, psz_name );
 236     if( p_message == NULL )
 237     {
 238         msg_Err( p_intf, "DBUS initialization failed: message initialization" );
 239         return;
 240     }
 241
 242     if( !dbus_connection_send( p_connection, p_message, NULL ) )
 243     {
 244         msg_Err( p_intf, "DBUS communication failed" );
 245     }
 246
 247     dbus_connection_flush( p_connection );
 248
 249     dbus_message_unref( p_message );
 250 }
 251
 252 static vlc_bool_t screensaver_is_running( DBusConnection *p_connection )
 253 {
 254     DBusError error;
 255     vlc_bool_t b_return;
 256
 257     if( !p_connection ) return VLC_FALSE;
 258
 259     dbus_error_init( &error );
 260     b_return = dbus_bus_name_has_owner( p_connection, GS_SERVICE, &error );
 261     if( dbus_error_is_set( &error ) ) dbus_error_free (&error);
 262
 263     return b_return;
 264 }
 265
 266 #endif
 267