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