inhibit: apply [22797] since it's the same main loop than screensaver.c
[vlc.git] / 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     vlc_object_lock( p_intf );
142     for(;;)
143     {
144         vlc_object_t *p_vout;
145
146         /* Check screensaver every 30 seconds */
147         if( vlc_object_timedwait( p_intf, mdate() + 30000000 ) < 0 )
148             break;
149
150         p_vout = vlc_object_find( p_intf, VLC_OBJECT_VOUT, FIND_ANYWHERE );
151
152         /* If there is a video output, disable xscreensaver */
153         if( p_vout )
154         {
155             input_thread_t *p_input;
156             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                     system( "xscreensaver-command -deactivate >&- 2>&- &" );
164
165                     /* If we have dbus support, let's communicate directly
166                        with gnome-screensave else, run
167                        gnome-screensaver-command */
168 #ifdef HAVE_DBUS
169                     poke_screensaver( p_intf, p_intf->p_sys->p_connection );
170 #else
171                     system( "gnome-screensaver-command --poke >&- 2>&- &" );
172 #endif
173                     /* FIXME: add support for other screensavers */
174                 }
175                 vlc_object_release( p_input );
176             }
177         }
178     }
179     vlc_object_unlock( p_intf );
180 }
181
182 #ifdef HAVE_DBUS
183
184 static DBusConnection * dbus_init( intf_thread_t *p_intf )
185 {
186     DBusError dbus_error;
187
188     dbus_error_init (&dbus_error);
189     DBusConnection * p_connection = dbus_bus_get( DBUS_BUS_SESSION, &dbus_error );
190
191     if ( !p_connection )
192     {
193         msg_Warn( p_intf, "failed to connect to the D-BUS daemon: %s",
194                           dbus_error.message);
195         dbus_error_free( &dbus_error );
196         return NULL;
197     }
198
199     return p_connection;
200 }
201
202 static void poke_screensaver( intf_thread_t *p_intf,
203                               DBusConnection *p_connection )
204 {
205     if( screensaver_is_running( p_connection ) )
206     {
207 #   ifdef SCREENSAVER_DEBUG
208         msg_Dbg( p_intf, "found a running gnome-screensaver instance" );
209 #   endif
210         /* gnome-screensaver changed it's D-Bus interface, so we need both */
211         screensaver_send_message_void( p_intf, p_connection, "Poke" );
212         screensaver_send_message_void( p_intf, p_connection,
213                 "SimulateUserActivity" );
214     }
215 #   ifdef SCREENSAVER_DEBUG
216     else
217     {
218         msg_Dbg( p_intf, "found no running gnome-screensaver instance" );
219     }
220 #   endif
221 }
222
223 static void screensaver_send_message_void ( intf_thread_t *p_intf,
224                                        DBusConnection *p_connection,
225                                        const char *psz_name )
226 {
227     DBusMessage *p_message;
228
229     if( !p_connection || !psz_name ) return;
230
231     p_message = dbus_message_new_method_call( GS_SERVICE, GS_PATH,
232                                               GS_INTERFACE, psz_name );
233     if( p_message == NULL )
234     {
235         msg_Err( p_intf, "DBUS initialization failed: message initialization" );
236         return;
237     }
238
239     if( !dbus_connection_send( p_connection, p_message, NULL ) )
240     {
241         msg_Err( p_intf, "DBUS communication failed" );
242     }
243
244     dbus_connection_flush( p_connection );
245
246     dbus_message_unref( p_message );
247 }
248
249 static vlc_bool_t screensaver_is_running( DBusConnection *p_connection )
250 {
251     DBusError error;
252     vlc_bool_t b_return;
253
254     if( !p_connection ) return VLC_FALSE;
255
256     dbus_error_init( &error );
257     b_return = dbus_bus_name_has_owner( p_connection, GS_SERVICE, &error );
258     if( dbus_error_is_set( &error ) ) dbus_error_free (&error);
259
260     return b_return;
261 }
262
263 #endif
264