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_plugin.h>
37 static int Open (vlc_object_t *);
38 static void Close (vlc_object_t *);
44 set_shortname (N_("Screen capture"))
45 set_description (N_("Screen capture"))
46 set_category (CAT_PLAYLIST)
47 set_subcategory (SUBCAT_PLAYLIST_SD)
48 set_capability ("services_discovery", 0)
49 set_callbacks (Open, Close)
54 struct services_discovery_sys_t
56 xcb_connection_t *conn;
58 xcb_atom_t net_client_list;
59 xcb_window_t root_window;
63 static void *Run (void *);
64 static void Update (services_discovery_t *);
65 static void DelItem (void *);
68 * Probes and initializes.
70 static int Open (vlc_object_t *obj)
72 services_discovery_t *sd = (services_discovery_t *)obj;
73 services_discovery_sys_t *p_sys = malloc (sizeof (*p_sys));
79 /* Connect to X server */
80 char *display = var_CreateGetNonEmptyString (obj, "x11-display");
82 xcb_connection_t *conn = xcb_connect (display, &snum);
84 if (xcb_connection_has_error (conn))
91 /* Find configured screen */
92 const xcb_setup_t *setup = xcb_get_setup (conn);
93 const xcb_screen_t *scr = NULL;
94 for (xcb_screen_iterator_t i = xcb_setup_roots_iterator (setup);
95 i.rem > 0; xcb_screen_next (&i))
106 msg_Err (obj, "bad X11 screen number");
110 p_sys->root_window = scr->root;
111 xcb_change_window_attributes (conn, scr->root, XCB_CW_EVENT_MASK,
112 &(uint32_t) { XCB_EVENT_MASK_PROPERTY_CHANGE });
114 /* TODO: check that _NET_CLIENT_LIST is in _NET_SUPPORTED
115 * (and _NET_SUPPORTING_WM_CHECK) */
116 xcb_intern_atom_cookie_t ck;
117 ck = xcb_intern_atom (conn, 1, strlen ("_NET_CLIENT_LIST"),
119 xcb_intern_atom_reply_t *r = xcb_intern_atom_reply (conn, ck, NULL);
120 if (r == NULL || r->atom == 0)
122 dialog_Fatal (sd, _("Application list failure"),
123 _("Your window manager does not support application list."));
124 msg_Err (sd, "application list not support (_NET_CLIENT_LIST absent)");
128 p_sys->net_client_list = r->atom;
134 if (vlc_clone (&p_sys->thread, Run, sd, VLC_THREAD_PRIORITY_LOW))
139 xcb_disconnect (p_sys->conn);
148 static void Close (vlc_object_t *obj)
150 services_discovery_t *sd = (services_discovery_t *)obj;
151 services_discovery_sys_t *p_sys = sd->p_sys;
153 vlc_cancel (p_sys->thread);
154 vlc_join (p_sys->thread, NULL);
155 xcb_disconnect (p_sys->conn);
156 tdestroy (p_sys->nodes, DelItem);
160 static void *Run (void *data)
162 services_discovery_t *sd = data;
163 services_discovery_sys_t *p_sys = sd->p_sys;
164 xcb_connection_t *conn = p_sys->conn;
165 int fd = xcb_get_file_descriptor (conn);
169 while (!xcb_connection_has_error (conn))
171 xcb_generic_event_t *ev;
172 struct pollfd ufd = { .fd = fd, .events = POLLIN, };
176 int canc = vlc_savecancel ();
177 while ((ev = xcb_poll_for_event (conn)) != NULL)
179 if ((ev->response_type & 0x7F) == XCB_PROPERTY_NOTIFY)
181 const xcb_property_notify_event_t *pn =
182 (xcb_property_notify_event_t *)ev;
183 if (pn->atom == p_sys->net_client_list)
188 vlc_restorecancel (canc);
195 xcb_window_t xid; /* must be first for cmpapp */
197 services_discovery_t *owner;
200 static struct app *AddItem (services_discovery_t *sd, xcb_window_t xid)
203 if (asprintf (&mrl, "window://0x%"PRIx8, xid) == -1)
206 input_item_t *item = input_item_NewWithType (VLC_OBJECT (sd), mrl,
209 ITEM_TYPE_CARD /* FIXME */);
214 struct app *app = malloc (sizeof (*app));
217 vlc_gc_decref (item);
223 services_discovery_AddItem (sd, item, _("Applications"));
227 static void DelItem (void *data)
229 struct app *app = data;
231 services_discovery_RemoveItem (app->owner, app->item);
232 vlc_gc_decref (app->item);
236 static int cmpapp (const void *a, const void *b)
238 xcb_window_t wa = *(xcb_window_t *)a;
239 xcb_window_t wb = *(xcb_window_t *)b;
248 static void Update (services_discovery_t *sd)
250 services_discovery_sys_t *p_sys = sd->p_sys;
251 xcb_connection_t *conn = p_sys->conn;
253 xcb_get_property_reply_t *r =
254 xcb_get_property_reply (conn,
255 xcb_get_property (conn, false, p_sys->root_window,
256 p_sys->net_client_list, XA_WINDOW, 0, 1024),
259 return; /* FIXME: remove all entries */
261 xcb_window_t *ent = xcb_get_property_value (r);
262 int n = xcb_get_property_value_length (r) / 4;
263 void *newnodes = NULL, *oldnodes = p_sys->nodes;
265 for (int i = 0; i < n; i++)
267 xcb_window_t id = *(ent++);
270 struct app **pa = tfind (&id, &oldnodes, cmpapp);
271 if (pa != NULL) /* existing entry */
274 tdelete (app, &oldnodes, cmpapp);
278 app = AddItem (sd, id);
283 pa = tsearch (app, &newnodes, cmpapp);
284 if (pa == NULL /* OOM */ || *pa != app /* buggy window manager */)
289 /* Remove old nodes */
290 tdestroy (oldnodes, DelItem);
291 p_sys->nodes = newnodes;