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
  33 #include <modules/dbus-util.h>
  34
  35 #include "reserve.h"
  36 #include "reserve-wrap.h"
  37
  38 struct pa_reserve_wrapper {
  39     PA_REFCNT_DECLARE;
  40     pa_core *core;
  41     pa_dbus_connection *connection;
  42     pa_hook hook;
  43     struct rd_device *device;
  44     char *shared_name;
  45 };
  46
  47 static void reserve_wrapper_free(pa_reserve_wrapper *r) {
  48     pa_assert(r);
  49
  50     if (r->device)
  51         rd_release(r->device);
  52
  53     pa_hook_done(&r->hook);
  54
  55     if (r->connection)
  56         pa_dbus_connection_unref(r->connection);
  57
  58     if (r->shared_name) {
  59         pa_assert_se(pa_shared_remove(r->core, r->shared_name) >= 0);
  60         pa_xfree(r->shared_name);
  61     }
  62
  63     pa_xfree(r);
  64 }
  65
  66 static int request_cb(rd_device *d, int forced) {
  67     pa_reserve_wrapper *r;
  68     int k;
  69
  70     pa_assert(d);
  71     pa_assert_se(r = rd_get_userdata(d));
  72     pa_assert(PA_REFCNT_VALUE(r) >= 1);
  73
  74     PA_REFCNT_INC(r);
  75
  76     k = pa_hook_fire(&r->hook, PA_INT_TO_PTR(forced));
  77     pa_log_debug("Device unlock has been requested and %s.", k < 0 ? "failed" : "succeeded");
  78
  79     pa_reserve_wrapper_unref(r);
  80
  81     return k < 0 ? -1 : 1;
  82 }
  83
  84 pa_reserve_wrapper* pa_reserve_wrapper_get(pa_core *c, const char *device_name) {
  85     pa_reserve_wrapper *r;
  86     DBusError error;
  87     int k;
  88     char *t;
  89
  90     dbus_error_init(&error);
  91
  92     pa_assert(c);
  93     pa_assert(device_name);
  94
  95     t = pa_sprintf_malloc("reserve-wrapper@%s", device_name);
  96
  97     if ((r = pa_shared_get(c, t))) {
  98         pa_xfree(t);
  99
 100         pa_assert(PA_REFCNT_VALUE(r) >= 1);
 101         PA_REFCNT_INC(r);
 102
 103         return r;
 104     }
 105
 106     r = pa_xnew0(pa_reserve_wrapper, 1);
 107     PA_REFCNT_INIT(r);
 108     r->core = c;
 109     pa_hook_init(&r->hook, r);
 110     r->shared_name = t;
 111
 112     pa_assert_se(pa_shared_set(c, r->shared_name, r) >= 0);
 113
 114     if (!(r->connection = pa_dbus_bus_get(c, DBUS_BUS_SESSION, &error)) || dbus_error_is_set(&error)) {
 115         pa_log_error("Unable to contact D-Bus session bus: %s: %s", error.name, error.message);
 116         goto fail;
 117     }
 118
 119     if ((k = rd_acquire(
 120                  &r->device,
 121                  pa_dbus_connection_get(r->connection),
 122                  device_name,
 123                  _("PulseAudio Sound Server"),
 124                  0,
 125                  request_cb,
 126                  NULL)) < 0) {
 127
 128         pa_log_error("Failed to acquire reservation lock on device '%s': %s", device_name, pa_cstrerror(-k));
 129         goto fail;
 130     }
 131
 132     pa_log_debug("Successfully acquired reservation lock on device '%s'", device_name);
 133
 134     rd_set_userdata(r->device, r);
 135
 136     return r;
 137
 138 fail:
 139     dbus_error_free(&error);
 140
 141     reserve_wrapper_free(r);
 142
 143     return NULL;
 144 }
 145
 146 void pa_reserve_wrapper_unref(pa_reserve_wrapper *r) {
 147     pa_assert(r);
 148     pa_assert(PA_REFCNT_VALUE(r) >= 1);
 149
 150     if (PA_REFCNT_DEC(r) > 0)
 151         return;
 152
 153     reserve_wrapper_free(r);
 154 }
 155
 156 pa_hook* pa_reserve_wrapper_hook(pa_reserve_wrapper *r) {
 157     pa_assert(r);
 158     pa_assert(PA_REFCNT_VALUE(r) >= 1);
 159
 160     return &r->hook;
 161 }
 162
 163 void pa_reserve_wrapper_set_application_device_name(pa_reserve_wrapper *r, const char *name) {
 164     pa_assert(r);
 165     pa_assert(PA_REFCNT_VALUE(r) >= 1);
 166
 167     rd_set_application_device_name(r->device, name);
 168 }