code.delx.au - pulseaudio/blob - src/pulsecore/x11wrap.c

   1 /* $Id$ */
   2
   3 /***
   4   This file is part of PulseAudio.
   5
   6   PulseAudio is free software; you can redistribute it and/or modify
   7   it under the terms of the GNU Lesser General Public License as published
   8   by the Free Software Foundation; either version 2 of the License,
   9   or (at your option) any later version.
  10
  11   PulseAudio is distributed in the hope that it will be useful, but
  12   WITHOUT ANY WARRANTY; without even the implied warranty of
  13   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  14   General Public License for more details.
  15
  16   You should have received a copy of the GNU Lesser General Public License
  17   along with PulseAudio; if not, write to the Free Software
  18   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
  19   USA.
  20 ***/
  21
  22 #include <assert.h>
  23 #include <stdio.h>
  24
  25 #include <pulse/xmalloc.h>
  26
  27 #include <pulsecore/llist.h>
  28 #include <pulsecore/log.h>
  29 #include <pulsecore/props.h>
  30
  31 #include "x11wrap.h"
  32
  33 typedef struct pa_x11_internal pa_x11_internal;
  34
  35 struct pa_x11_internal {
  36     PA_LLIST_FIELDS(pa_x11_internal);
  37     pa_x11_wrapper *wrapper;
  38     pa_io_event* io_event;
  39     int fd;
  40 };
  41
  42 struct pa_x11_wrapper {
  43     pa_core *core;
  44     int ref;
  45
  46     char *property_name;
  47     Display *display;
  48
  49     pa_defer_event* defer_event;
  50     pa_io_event* io_event;
  51
  52     PA_LLIST_HEAD(pa_x11_client, clients);
  53     PA_LLIST_HEAD(pa_x11_internal, internals);
  54 };
  55
  56 struct pa_x11_client {
  57     PA_LLIST_FIELDS(pa_x11_client);
  58     pa_x11_wrapper *wrapper;
  59     int (*callback)(pa_x11_wrapper *w, XEvent *e, void *userdata);
  60     void *userdata;
  61 };
  62
  63 /* Dispatch all pending X11 events */
  64 static void work(pa_x11_wrapper *w) {
  65     assert(w && w->ref >= 1);
  66
  67     while (XPending(w->display)) {
  68         pa_x11_client *c;
  69         XEvent e;
  70         XNextEvent(w->display, &e);
  71
  72         for (c = w->clients; c; c = c->next) {
  73             assert(c->callback);
  74             if (c->callback(w, &e, c->userdata) != 0)
  75                 break;
  76         }
  77     }
  78 }
  79
  80 /* IO notification event for the X11 display connection */
  81 static void display_io_event(pa_mainloop_api *m, pa_io_event *e, int fd, PA_GCC_UNUSED pa_io_event_flags_t f, void *userdata) {
  82     pa_x11_wrapper *w = userdata;
  83     assert(m && e && fd >= 0 && w && w->ref >= 1);
  84     work(w);
  85 }
  86
  87 /* Deferred notification event. Called once each main loop iteration */
  88 static void defer_event(pa_mainloop_api *m, pa_defer_event *e, void *userdata) {
  89     pa_x11_wrapper *w = userdata;
  90     assert(m && e && w && w->ref >= 1);
  91
  92     m->defer_enable(e, 0);
  93
  94     work(w);
  95 }
  96
  97 /* IO notification event for X11 internal connections */
  98 static void internal_io_event(pa_mainloop_api *m, pa_io_event *e, int fd, PA_GCC_UNUSED pa_io_event_flags_t f, void *userdata) {
  99     pa_x11_wrapper *w = userdata;
 100     assert(m && e && fd >= 0 && w && w->ref >= 1);
 101
 102     XProcessInternalConnection(w->display, fd);
 103
 104     work(w);
 105 }
 106
 107 /* Add a new IO source for the specified X11 internal connection */
 108 static pa_x11_internal* x11_internal_add(pa_x11_wrapper *w, int fd) {
 109     pa_x11_internal *i;
 110     assert(fd >= 0);
 111
 112     i = pa_xmalloc(sizeof(pa_x11_internal));
 113     assert(i);
 114     i->wrapper = w;
 115     i->io_event = w->core->mainloop->io_new(w->core->mainloop, fd, PA_IO_EVENT_INPUT, internal_io_event, w);
 116     i->fd = fd;
 117
 118     PA_LLIST_PREPEND(pa_x11_internal, w->internals, i);
 119     return i;
 120 }
 121
 122 /* Remove an IO source for an X11 internal connection */
 123 static void x11_internal_remove(pa_x11_wrapper *w, pa_x11_internal *i) {
 124     assert(i);
 125
 126     PA_LLIST_REMOVE(pa_x11_internal, w->internals, i);
 127     w->core->mainloop->io_free(i->io_event);
 128     pa_xfree(i);
 129 }
 130
 131 /* Implementation of XConnectionWatchProc */
 132 static void x11_watch(Display *display, XPointer userdata, int fd, Bool opening, XPointer *watch_data) {
 133     pa_x11_wrapper *w = (pa_x11_wrapper*) userdata;
 134     assert(display && w && fd >= 0);
 135
 136     if (opening)
 137         *watch_data = (XPointer) x11_internal_add(w, fd);
 138     else
 139         x11_internal_remove(w, (pa_x11_internal*) *watch_data);
 140 }
 141
 142 static pa_x11_wrapper* x11_wrapper_new(pa_core *c, const char *name, const char *t) {
 143     pa_x11_wrapper*w;
 144     Display *d;
 145     int r;
 146
 147     if (!(d = XOpenDisplay(name))) {
 148         pa_log("XOpenDisplay() failed");
 149         return NULL;
 150     }
 151
 152     w = pa_xmalloc(sizeof(pa_x11_wrapper));
 153     w->core = c;
 154     w->ref = 1;
 155     w->property_name = pa_xstrdup(t);
 156     w->display = d;
 157
 158     PA_LLIST_HEAD_INIT(pa_x11_client, w->clients);
 159     PA_LLIST_HEAD_INIT(pa_x11_internal, w->internals);
 160
 161     w->defer_event = c->mainloop->defer_new(c->mainloop, defer_event, w);
 162     w->io_event = c->mainloop->io_new(c->mainloop, ConnectionNumber(d), PA_IO_EVENT_INPUT, display_io_event, w);
 163
 164     XAddConnectionWatch(d, x11_watch, (XPointer) w);
 165
 166     r = pa_property_set(c, w->property_name, w);
 167     assert(r >= 0);
 168
 169     return w;
 170 }
 171
 172 static void x11_wrapper_free(pa_x11_wrapper*w) {
 173     int r;
 174     assert(w);
 175
 176     r = pa_property_remove(w->core, w->property_name);
 177     assert(r >= 0);
 178
 179     assert(!w->clients);
 180
 181     XRemoveConnectionWatch(w->display, x11_watch, (XPointer) w);
 182     XCloseDisplay(w->display);
 183
 184     w->core->mainloop->io_free(w->io_event);
 185     w->core->mainloop->defer_free(w->defer_event);
 186
 187     while (w->internals)
 188         x11_internal_remove(w, w->internals);
 189
 190     pa_xfree(w->property_name);
 191     pa_xfree(w);
 192 }
 193
 194 pa_x11_wrapper* pa_x11_wrapper_get(pa_core *c, const char *name) {
 195     char t[256];
 196     pa_x11_wrapper *w;
 197     assert(c);
 198
 199     snprintf(t, sizeof(t), "x11-wrapper%s%s", name ? "-" : "", name ? name : "");
 200     if ((w = pa_property_get(c, t)))
 201         return pa_x11_wrapper_ref(w);
 202
 203     return x11_wrapper_new(c, name, t);
 204 }
 205
 206 pa_x11_wrapper* pa_x11_wrapper_ref(pa_x11_wrapper *w) {
 207     assert(w && w->ref >= 1);
 208     w->ref++;
 209     return w;
 210 }
 211
 212 void pa_x11_wrapper_unref(pa_x11_wrapper* w) {
 213     assert(w && w->ref >= 1);
 214
 215     if (!(--w->ref))
 216         x11_wrapper_free(w);
 217 }
 218
 219 Display *pa_x11_wrapper_get_display(pa_x11_wrapper *w) {
 220     assert(w && w->ref >= 1);
 221
 222     /* Somebody is using us, schedule a output buffer flush */
 223     w->core->mainloop->defer_enable(w->defer_event, 1);
 224
 225     return w->display;
 226 }
 227
 228 pa_x11_client* pa_x11_client_new(pa_x11_wrapper *w, int (*cb)(pa_x11_wrapper *w, XEvent *e, void *userdata), void *userdata) {
 229     pa_x11_client *c;
 230     assert(w && w->ref >= 1);
 231
 232     c = pa_xmalloc(sizeof(pa_x11_client));
 233     c->wrapper = w;
 234     c->callback = cb;
 235     c->userdata = userdata;
 236
 237     PA_LLIST_PREPEND(pa_x11_client, w->clients, c);
 238
 239     return c;
 240 }
 241
 242 void pa_x11_client_free(pa_x11_client *c) {
 243     assert(c && c->wrapper && c->wrapper->ref >= 1);
 244
 245     PA_LLIST_REMOVE(pa_x11_client, c->wrapper->clients, c);
 246     pa_xfree(c);
 247 }