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

   1 /* $Id$ */
   2
   3 /***
   4   This file is part of PulseAudio.
   5
   6   Copyright 2004-2006 Lennart Poettering
   7
   8   PulseAudio is free software; you can redistribute it and/or modify
   9   it under the terms of the GNU Lesser General Public License as published
  10   by the Free Software Foundation; either version 2 of the License,
  11   or (at your option) any later version.
  12
  13   PulseAudio is distributed in the hope that it will be useful, but
  14   WITHOUT ANY WARRANTY; without even the implied warranty of
  15   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  16   General Public License for more details.
  17
  18   You should have received a copy of the GNU Lesser General Public License
  19   along with PulseAudio; if not, write to the Free Software
  20   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
  21   USA.
  22 ***/
  23
  24 #include <assert.h>
  25 #include <stdio.h>
  26
  27 #include <pulse/xmalloc.h>
  28
  29 #include <pulsecore/llist.h>
  30 #include <pulsecore/log.h>
  31 #include <pulsecore/props.h>
  32
  33 #include "x11wrap.h"
  34
  35 typedef struct pa_x11_internal pa_x11_internal;
  36
  37 struct pa_x11_internal {
  38     PA_LLIST_FIELDS(pa_x11_internal);
  39     pa_x11_wrapper *wrapper;
  40     pa_io_event* io_event;
  41     int fd;
  42 };
  43
  44 struct pa_x11_wrapper {
  45     pa_core *core;
  46     int ref;
  47
  48     char *property_name;
  49     Display *display;
  50
  51     pa_defer_event* defer_event;
  52     pa_io_event* io_event;
  53
  54     PA_LLIST_HEAD(pa_x11_client, clients);
  55     PA_LLIST_HEAD(pa_x11_internal, internals);
  56 };
  57
  58 struct pa_x11_client {
  59     PA_LLIST_FIELDS(pa_x11_client);
  60     pa_x11_wrapper *wrapper;
  61     int (*callback)(pa_x11_wrapper *w, XEvent *e, void *userdata);
  62     void *userdata;
  63 };
  64
  65 /* Dispatch all pending X11 events */
  66 static void work(pa_x11_wrapper *w) {
  67     assert(w && w->ref >= 1);
  68
  69     while (XPending(w->display)) {
  70         pa_x11_client *c;
  71         XEvent e;
  72         XNextEvent(w->display, &e);
  73
  74         for (c = w->clients; c; c = c->next) {
  75             assert(c->callback);
  76             if (c->callback(w, &e, c->userdata) != 0)
  77                 break;
  78         }
  79     }
  80 }
  81
  82 /* IO notification event for the X11 display connection */
  83 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) {
  84     pa_x11_wrapper *w = userdata;
  85     assert(m && e && fd >= 0 && w && w->ref >= 1);
  86     work(w);
  87 }
  88
  89 /* Deferred notification event. Called once each main loop iteration */
  90 static void defer_event(pa_mainloop_api *m, pa_defer_event *e, void *userdata) {
  91     pa_x11_wrapper *w = userdata;
  92     assert(m && e && w && w->ref >= 1);
  93
  94     m->defer_enable(e, 0);
  95
  96     work(w);
  97 }
  98
  99 /* IO notification event for X11 internal connections */
 100 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) {
 101     pa_x11_wrapper *w = userdata;
 102     assert(m && e && fd >= 0 && w && w->ref >= 1);
 103
 104     XProcessInternalConnection(w->display, fd);
 105
 106     work(w);
 107 }
 108
 109 /* Add a new IO source for the specified X11 internal connection */
 110 static pa_x11_internal* x11_internal_add(pa_x11_wrapper *w, int fd) {
 111     pa_x11_internal *i;
 112     assert(fd >= 0);
 113
 114     i = pa_xmalloc(sizeof(pa_x11_internal));
 115     assert(i);
 116     i->wrapper = w;
 117     i->io_event = w->core->mainloop->io_new(w->core->mainloop, fd, PA_IO_EVENT_INPUT, internal_io_event, w);
 118     i->fd = fd;
 119
 120     PA_LLIST_PREPEND(pa_x11_internal, w->internals, i);
 121     return i;
 122 }
 123
 124 /* Remove an IO source for an X11 internal connection */
 125 static void x11_internal_remove(pa_x11_wrapper *w, pa_x11_internal *i) {
 126     assert(i);
 127
 128     PA_LLIST_REMOVE(pa_x11_internal, w->internals, i);
 129     w->core->mainloop->io_free(i->io_event);
 130     pa_xfree(i);
 131 }
 132
 133 /* Implementation of XConnectionWatchProc */
 134 static void x11_watch(Display *display, XPointer userdata, int fd, Bool opening, XPointer *watch_data) {
 135     pa_x11_wrapper *w = (pa_x11_wrapper*) userdata;
 136     assert(display && w && fd >= 0);
 137
 138     if (opening)
 139         *watch_data = (XPointer) x11_internal_add(w, fd);
 140     else
 141         x11_internal_remove(w, (pa_x11_internal*) *watch_data);
 142 }
 143
 144 static pa_x11_wrapper* x11_wrapper_new(pa_core *c, const char *name, const char *t) {
 145     pa_x11_wrapper*w;
 146     Display *d;
 147     int r;
 148
 149     if (!(d = XOpenDisplay(name))) {
 150         pa_log("XOpenDisplay() failed");
 151         return NULL;
 152     }
 153
 154     w = pa_xmalloc(sizeof(pa_x11_wrapper));
 155     w->core = c;
 156     w->ref = 1;
 157     w->property_name = pa_xstrdup(t);
 158     w->display = d;
 159
 160     PA_LLIST_HEAD_INIT(pa_x11_client, w->clients);
 161     PA_LLIST_HEAD_INIT(pa_x11_internal, w->internals);
 162
 163     w->defer_event = c->mainloop->defer_new(c->mainloop, defer_event, w);
 164     w->io_event = c->mainloop->io_new(c->mainloop, ConnectionNumber(d), PA_IO_EVENT_INPUT, display_io_event, w);
 165
 166     XAddConnectionWatch(d, x11_watch, (XPointer) w);
 167
 168     r = pa_property_set(c, w->property_name, w);
 169     assert(r >= 0);
 170
 171     return w;
 172 }
 173
 174 static void x11_wrapper_free(pa_x11_wrapper*w) {
 175     int r;
 176     assert(w);
 177
 178     r = pa_property_remove(w->core, w->property_name);
 179     assert(r >= 0);
 180
 181     assert(!w->clients);
 182
 183     XRemoveConnectionWatch(w->display, x11_watch, (XPointer) w);
 184     XCloseDisplay(w->display);
 185
 186     w->core->mainloop->io_free(w->io_event);
 187     w->core->mainloop->defer_free(w->defer_event);
 188
 189     while (w->internals)
 190         x11_internal_remove(w, w->internals);
 191
 192     pa_xfree(w->property_name);
 193     pa_xfree(w);
 194 }
 195
 196 pa_x11_wrapper* pa_x11_wrapper_get(pa_core *c, const char *name) {
 197     char t[256];
 198     pa_x11_wrapper *w;
 199     assert(c);
 200
 201     snprintf(t, sizeof(t), "x11-wrapper%s%s", name ? "-" : "", name ? name : "");
 202     if ((w = pa_property_get(c, t)))
 203         return pa_x11_wrapper_ref(w);
 204
 205     return x11_wrapper_new(c, name, t);
 206 }
 207
 208 pa_x11_wrapper* pa_x11_wrapper_ref(pa_x11_wrapper *w) {
 209     assert(w && w->ref >= 1);
 210     w->ref++;
 211     return w;
 212 }
 213
 214 void pa_x11_wrapper_unref(pa_x11_wrapper* w) {
 215     assert(w && w->ref >= 1);
 216
 217     if (!(--w->ref))
 218         x11_wrapper_free(w);
 219 }
 220
 221 Display *pa_x11_wrapper_get_display(pa_x11_wrapper *w) {
 222     assert(w && w->ref >= 1);
 223
 224     /* Somebody is using us, schedule a output buffer flush */
 225     w->core->mainloop->defer_enable(w->defer_event, 1);
 226
 227     return w->display;
 228 }
 229
 230 pa_x11_client* pa_x11_client_new(pa_x11_wrapper *w, int (*cb)(pa_x11_wrapper *w, XEvent *e, void *userdata), void *userdata) {
 231     pa_x11_client *c;
 232     assert(w && w->ref >= 1);
 233
 234     c = pa_xmalloc(sizeof(pa_x11_client));
 235     c->wrapper = w;
 236     c->callback = cb;
 237     c->userdata = userdata;
 238
 239     PA_LLIST_PREPEND(pa_x11_client, w->clients, c);
 240
 241     return c;
 242 }
 243
 244 void pa_x11_client_free(pa_x11_client *c) {
 245     assert(c && c->wrapper && c->wrapper->ref >= 1);
 246
 247     PA_LLIST_REMOVE(pa_x11_client, c->wrapper->clients, c);
 248     pa_xfree(c);
 249 }