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