code.delx.au - pulseaudio/blob - src/modules/reserve-wrap.c

   1 /***
   2   This file is part of PulseAudio.
   3
   4   Copyright 2009 Lennart Poettering
   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 2.1 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 #ifdef HAVE_CONFIG_H
  23 #include <config.h>
  24 #endif
  25
  26 #include <errno.h>
  27
  28 #include <pulse/xmalloc.h>
  29 #include <pulse/i18n.h>
  30
  31 #include <pulsecore/core-error.h>
  32 #include <pulsecore/core-util.h>
  33 #include <pulsecore/shared.h>
  34
  35 #ifdef HAVE_DBUS
  36 #include <pulsecore/dbus-shared.h>
  37 #include "reserve.h"
  38 #endif
  39
  40 #include "reserve-wrap.h"
  41
  42 struct pa_reserve_wrapper {
  43     PA_REFCNT_DECLARE;
  44     pa_core *core;
  45     pa_hook hook;
  46     char *shared_name;
  47 #ifdef HAVE_DBUS
  48     pa_dbus_connection *connection;
  49     struct rd_device *device;
  50 #endif
  51 };
  52
  53 static void reserve_wrapper_free(pa_reserve_wrapper *r) {
  54     pa_assert(r);
  55
  56 #ifdef HAVE_DBUS
  57     if (r->device)
  58         rd_release(r->device);
  59
  60     if (r->connection)
  61         pa_dbus_connection_unref(r->connection);
  62 #endif
  63
  64     pa_hook_done(&r->hook);
  65
  66     if (r->shared_name) {
  67         pa_assert_se(pa_shared_remove(r->core, r->shared_name) >= 0);
  68         pa_xfree(r->shared_name);
  69     }
  70
  71     pa_xfree(r);
  72 }
  73
  74 #ifdef HAVE_DBUS
  75 static int request_cb(rd_device *d, int forced) {
  76     pa_reserve_wrapper *r;
  77     int k;
  78
  79     pa_assert(d);
  80     pa_assert_se(r = rd_get_userdata(d));
  81     pa_assert(PA_REFCNT_VALUE(r) >= 1);
  82
  83     PA_REFCNT_INC(r);
  84
  85     k = pa_hook_fire(&r->hook, PA_INT_TO_PTR(forced));
  86     pa_log_debug("Device unlock has been requested and %s.", k < 0 ? "failed" : "succeeded");
  87
  88     pa_reserve_wrapper_unref(r);
  89
  90     return k < 0 ? -1 : 1;
  91 }
  92 #endif
  93
  94 pa_reserve_wrapper* pa_reserve_wrapper_get(pa_core *c, const char *device_name) {
  95     pa_reserve_wrapper *r;
  96     int k;
  97     char *t;
  98 #ifdef HAVE_DBUS
  99     DBusError error;
 100
 101     dbus_error_init(&error);
 102 #endif
 103
 104     pa_assert(c);
 105     pa_assert(device_name);
 106
 107     t = pa_sprintf_malloc("reserve-wrapper@%s", device_name);
 108
 109     if ((r = pa_shared_get(c, t))) {
 110         pa_xfree(t);
 111
 112         pa_assert(PA_REFCNT_VALUE(r) >= 1);
 113         PA_REFCNT_INC(r);
 114
 115         return r;
 116     }
 117
 118     r = pa_xnew0(pa_reserve_wrapper, 1);
 119     PA_REFCNT_INIT(r);
 120     r->core = c;
 121     pa_hook_init(&r->hook, r);
 122     r->shared_name = t;
 123
 124     pa_assert_se(pa_shared_set(c, r->shared_name, r) >= 0);
 125
 126 #ifdef HAVE_DBUS
 127     if (!(r->connection = pa_dbus_bus_get(c, DBUS_BUS_SESSION, &error)) || dbus_error_is_set(&error)) {
 128         pa_log_warn("Unable to contact D-Bus session bus: %s: %s", error.name, error.message);
 129
 130         /* We don't treat this as error here because we want allow PA
 131          * to run even when no session bus is available. */
 132         return r;
 133     }
 134
 135     if ((k = rd_acquire(
 136                  &r->device,
 137                  pa_dbus_connection_get(r->connection),
 138                  device_name,
 139                  _("PulseAudio Sound Server"),
 140                  0,
 141                  request_cb,
 142                  NULL)) < 0) {
 143
 144         if (k == -EBUSY) {
 145             pa_log_error("Device '%s' already locked.", device_name);
 146             goto fail;
 147         } else {
 148             pa_log_warn("Failed to acquire reservation lock on device '%s': %s", device_name, pa_cstrerror(-k));
 149             return r;
 150         }
 151     }
 152
 153     pa_log_debug("Successfully acquired reservation lock on device '%s'", device_name);
 154
 155     rd_set_userdata(r->device, r);
 156
 157     return r;
 158 fail:
 159     dbus_error_free(&error);
 160
 161     reserve_wrapper_free(r);
 162
 163     return NULL;
 164 #else
 165     return r;
 166 #endif
 167 }
 168
 169 void pa_reserve_wrapper_unref(pa_reserve_wrapper *r) {
 170     pa_assert(r);
 171     pa_assert(PA_REFCNT_VALUE(r) >= 1);
 172
 173     if (PA_REFCNT_DEC(r) > 0)
 174         return;
 175
 176     reserve_wrapper_free(r);
 177 }
 178
 179 pa_hook* pa_reserve_wrapper_hook(pa_reserve_wrapper *r) {
 180     pa_assert(r);
 181     pa_assert(PA_REFCNT_VALUE(r) >= 1);
 182
 183     return &r->hook;
 184 }
 185
 186 void pa_reserve_wrapper_set_application_device_name(pa_reserve_wrapper *r, const char *name) {
 187     pa_assert(r);
 188     pa_assert(PA_REFCNT_VALUE(r) >= 1);
 189
 190 #ifdef HAVE_DBUS
 191     rd_set_application_device_name(r->device, name);
 192 #endif
 193 }