3 * @brief List of application windows XCB module for VLC media player
5 /*****************************************************************************
6 * Copyright © 2009 Rémi Denis-Courmont
8 * This library is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU Lesser General Public License
10 * as published by the Free Software Foundation; either version 2.1
11 * of the License, or (at your option) any later version.
13 * This library is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
18 * You should have received a copy of the GNU Lesser General Public
19 * License along with this library; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
21 ****************************************************************************/
28 typedef xcb_atom_t Atom;
29 #include <X11/Xatom.h> /* XA_WINDOW */
30 #include <vlc_common.h>
31 #include <vlc_services_discovery.h>
32 #include <vlc_dialog.h>
33 #include <vlc_charset.h>
34 #include <vlc_plugin.h>
38 static int Open (vlc_object_t *);
39 static void Close (vlc_object_t *);
40 static int vlc_sd_probe_Open (vlc_object_t *);
46 set_shortname (N_("Screen capture"))
47 set_description (N_("Screen capture"))
48 set_category (CAT_PLAYLIST)
49 set_subcategory (SUBCAT_PLAYLIST_SD)
50 set_capability ("services_discovery", 0)
51 set_callbacks (Open, Close)
55 VLC_SD_PROBE_SUBMODULE
58 struct services_discovery_sys_t
60 xcb_connection_t *conn;
62 xcb_atom_t net_client_list;
63 xcb_atom_t net_wm_name;
64 xcb_window_t root_window;
68 static void *Run (void *);
69 static void Update (services_discovery_t *);
70 static void DelItem (void *);
72 static int vlc_sd_probe_Open (vlc_object_t *obj)
74 vlc_probe_t *probe = (vlc_probe_t *)obj;
76 char *display = var_CreateGetNonEmptyString (obj, "x11-display");
77 xcb_connection_t *conn = xcb_connect (display, NULL);
79 if (xcb_connection_has_error (conn))
80 return VLC_PROBE_CONTINUE;
81 xcb_disconnect (conn);
82 return vlc_sd_probe_Add (probe, "xcb_apps{longname=\"Screen capture\"}",
83 N_("Screen capture"));
87 * Probes and initializes.
89 static int Open (vlc_object_t *obj)
91 services_discovery_t *sd = (services_discovery_t *)obj;
92 services_discovery_sys_t *p_sys = malloc (sizeof (*p_sys));
98 /* Connect to X server */
99 char *display = var_CreateGetNonEmptyString (obj, "x11-display");
101 xcb_connection_t *conn = xcb_connect (display, &snum);
103 if (xcb_connection_has_error (conn))
110 /* Find configured screen */
111 const xcb_setup_t *setup = xcb_get_setup (conn);
112 const xcb_screen_t *scr = NULL;
113 for (xcb_screen_iterator_t i = xcb_setup_roots_iterator (setup);
114 i.rem > 0; xcb_screen_next (&i))
125 msg_Err (obj, "bad X11 screen number");
129 p_sys->root_window = scr->root;
130 xcb_change_window_attributes (conn, scr->root, XCB_CW_EVENT_MASK,
131 &(uint32_t) { XCB_EVENT_MASK_PROPERTY_CHANGE });
133 /* TODO: check that _NET_CLIENT_LIST is in _NET_SUPPORTED
134 * (and _NET_SUPPORTING_WM_CHECK) */
135 xcb_intern_atom_reply_t *r;
136 xcb_intern_atom_cookie_t ncl, nwn;
138 ncl = xcb_intern_atom (conn, 1, strlen ("_NET_CLIENT_LIST"),
140 nwn = xcb_intern_atom (conn, 0, strlen ("_NET_WM_NAME"), "_NET_WM_NAME");
142 r = xcb_intern_atom_reply (conn, ncl, NULL);
143 if (r == NULL || r->atom == 0)
145 dialog_Fatal (sd, _("Application list failure"),
146 _("Your window manager does not support application list."));
147 msg_Err (sd, "application list not support (_NET_CLIENT_LIST absent)");
151 p_sys->net_client_list = r->atom;
153 r = xcb_intern_atom_reply (conn, nwn, NULL);
156 p_sys->net_wm_name = r->atom;
163 if (vlc_clone (&p_sys->thread, Run, sd, VLC_THREAD_PRIORITY_LOW))
168 xcb_disconnect (p_sys->conn);
177 static void Close (vlc_object_t *obj)
179 services_discovery_t *sd = (services_discovery_t *)obj;
180 services_discovery_sys_t *p_sys = sd->p_sys;
182 vlc_cancel (p_sys->thread);
183 vlc_join (p_sys->thread, NULL);
184 xcb_disconnect (p_sys->conn);
185 tdestroy (p_sys->nodes, DelItem);
189 static void *Run (void *data)
191 services_discovery_t *sd = data;
192 services_discovery_sys_t *p_sys = sd->p_sys;
193 xcb_connection_t *conn = p_sys->conn;
194 int fd = xcb_get_file_descriptor (conn);
198 while (!xcb_connection_has_error (conn))
200 xcb_generic_event_t *ev;
201 struct pollfd ufd = { .fd = fd, .events = POLLIN, };
205 int canc = vlc_savecancel ();
206 while ((ev = xcb_poll_for_event (conn)) != NULL)
208 if ((ev->response_type & 0x7F) == XCB_PROPERTY_NOTIFY)
210 const xcb_property_notify_event_t *pn =
211 (xcb_property_notify_event_t *)ev;
212 if (pn->atom == p_sys->net_client_list)
217 vlc_restorecancel (canc);
224 xcb_window_t xid; /* must be first for cmpapp */
226 services_discovery_t *owner;
229 static struct app *AddItem (services_discovery_t *sd, xcb_window_t xid)
231 services_discovery_sys_t *p_sys = sd->p_sys;
234 if (asprintf (&mrl, "window://0x%"PRIx8, xid) == -1)
237 xcb_get_property_reply_t *r =
238 xcb_get_property_reply (p_sys->conn,
239 xcb_get_property (p_sys->conn, 0, xid, p_sys->net_wm_name, 0,
240 0, 1023 /* max size */), NULL);
243 name = strndup (xcb_get_property_value (r),
244 xcb_get_property_value_length (r));
246 EnsureUTF8 (name); /* don't trust third party apps too much ;-) */
249 /* TODO: use WM_NAME (Latin-1) for very old apps */
253 input_item_t *item = input_item_NewWithType (VLC_OBJECT (sd), mrl,
256 ITEM_TYPE_CARD /* FIXME */);
262 struct app *app = malloc (sizeof (*app));
265 vlc_gc_decref (item);
271 services_discovery_AddItem (sd, item, _("Applications"));
275 static void DelItem (void *data)
277 struct app *app = data;
279 services_discovery_RemoveItem (app->owner, app->item);
280 vlc_gc_decref (app->item);
284 static int cmpapp (const void *a, const void *b)
286 xcb_window_t wa = *(xcb_window_t *)a;
287 xcb_window_t wb = *(xcb_window_t *)b;
296 static void Update (services_discovery_t *sd)
298 services_discovery_sys_t *p_sys = sd->p_sys;
299 xcb_connection_t *conn = p_sys->conn;
301 xcb_get_property_reply_t *r =
302 xcb_get_property_reply (conn,
303 xcb_get_property (conn, false, p_sys->root_window,
304 p_sys->net_client_list, XA_WINDOW, 0, 1024),
307 return; /* FIXME: remove all entries */
309 xcb_window_t *ent = xcb_get_property_value (r);
310 int n = xcb_get_property_value_length (r) / 4;
311 void *newnodes = NULL, *oldnodes = p_sys->nodes;
313 for (int i = 0; i < n; i++)
315 xcb_window_t id = *(ent++);
318 struct app **pa = tfind (&id, &oldnodes, cmpapp);
319 if (pa != NULL) /* existing entry */
322 tdelete (app, &oldnodes, cmpapp);
326 app = AddItem (sd, id);
331 pa = tsearch (app, &newnodes, cmpapp);
332 if (pa == NULL /* OOM */ || *pa != app /* buggy window manager */)
337 /* Remove old nodes */
338 tdestroy (oldnodes, DelItem);
339 p_sys->nodes = newnodes;