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/***
Volume Change Notification Module for PulseAudio
Copyright 2012 Alexander Sulfrian
This module is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published
by the Free Software Foundation; either version 2.1 of the License,
or (at your option) any later version.
This module is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with PulseAudio; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
USA.
***/
#include <config.h>
#include <pulsecore/module.h>
#include <pulsecore/core-subscribe.h>
#include <pulse/introspect.h>
#include <dbus/dbus.h>
PA_MODULE_AUTHOR("Alexander Sulfrian");
PA_MODULE_DESCRIPTION("Module that notify you on volume changes of sinks.");
PA_MODULE_VERSION(PACKAGE_VERSION);
PA_MODULE_USAGE("");
struct userdata {
pa_core *core;
pa_module *module;
pa_subscription *subscription;
/* dbus stuff */
DBusError dbus_error;
DBusConnection *dbus_connection;
};
void send_dbus_signal(const char *name, const pa_cvolume *vol,
const struct userdata *u)
{
DBusMessage* msg;
DBusMessageIter args;
/* create a signal and check for errors */
msg = dbus_message_new_signal("/org/PulseAudio/VolumeNotification",
"org.PulseAudio.VolumeNotification",
"VolumeChange");
if (!msg)
return;
/* append arguments onto signal */
dbus_message_iter_init_append(msg, &args);
if (!dbus_message_iter_append_basic(&args, DBUS_TYPE_STRING, &name))
goto fail;
/* send the message and flush the connection */
if (!dbus_connection_send(u->dbus_connection, msg, NULL))
goto fail;
dbus_connection_flush(u->dbus_connection);
fail:
/* free the message */
dbus_message_unref(msg);
}
void sink_change_event_cb(pa_core *c, pa_subscription_event_type_t t,
uint32_t idx, void *userdata)
{
pa_sink *s;
if (PA_SUBSCRIPTION_EVENT_CHANGE & t == 0)
return;
if (!userdata)
return;
s = pa_idxset_get_by_index(c->sinks, idx);
if (!s)
return;
send_dbus_signal(s->name, &s->reference_volume, userdata);
}
void pa__done(pa_module *m)
{
struct userdata *u;
if (!(u = m->userdata))
return;
pa_subscription_free(u->subscription);
if (u->dbus_connection)
dbus_connection_close(u->dbus_connection);
pa_xfree(u);
}
int pa__init(pa_module* m)
{
struct userdata *u;
pa_subscription_mask_t mask;
int ret;
m->userdata = u = pa_xnew0(struct userdata, 1);
u->core = m->core;
u->module = m;
mask = PA_SUBSCRIPTION_EVENT_SOURCE_OUTPUT | PA_SUBSCRIPTION_EVENT_CHANGE;
u->subscription = pa_subscription_new(m->core, mask,
sink_change_event_cb, u);
/* initialize dbus */
dbus_error_init(&u->dbus_error);
u->dbus_connection = dbus_bus_get(DBUS_BUS_SESSION, &u->dbus_error);
if (dbus_error_is_set(&u->dbus_error)) {
pa_log("DBus Connection Error (%s)\n", u->dbus_error.message);
dbus_error_free(&u->dbus_error);
}
if (!u->dbus_connection)
goto fail;
/* request a name on the bus */
ret = dbus_bus_request_name(u->dbus_connection,
"org.PulseAudio.VolumeNotification",
DBUS_NAME_FLAG_REPLACE_EXISTING,
&u->dbus_error);
if (dbus_error_is_set(&u->dbus_error)) {
pa_log("DBus Name Error (%s)\n", u->dbus_error.message);
dbus_error_free(&u->dbus_error);
}
if (DBUS_REQUEST_NAME_REPLY_PRIMARY_OWNER != ret) {
goto fail;
}
return 0;
fail:
pa__done(m);
return -1;
}
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