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cfm-controller.cc
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cfm-controller.cc
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/*
* cfm-controller.cc
* Copyright (C) 2011 Adrian Perez <aperez@igalia.com>
*
* Distributed under terms of the MIT license.
*/
#include "cfm-controller.h"
#include <dbus/dbus.h>
#include <dbus/dbus-glib-lowlevel.h>
#include <QDeclarativeContext>
#include <QDBusInterface>
#include <QDBusPendingCall>
#include <QStringList>
static const gchar CUACFM_STREAM_URL[] = "http://cien30.udc.es/cuacfm.mp3";
static const QString STORE_DBUS_IFACE("com.nokia.OviStoreClient");
static void setProperty(void* object,
const gchar* name,
const gchar* newValue)
{
GValue value;
memset(&value, 0x00, sizeof(GValue));
g_value_init(&value, G_TYPE_STRING);
g_value_set_string(&value, newValue);
g_object_set_property(G_OBJECT(object), name, &value);
g_value_unset(&value);
}
static void setProperty(void* object,
const gchar* name,
gboolean newValue)
{
GValue value;
memset(&value, 0x00, sizeof(GValue));
g_value_init(&value, G_TYPE_BOOLEAN);
g_value_set_boolean(&value, newValue);
g_object_set_property(G_OBJECT(object), name, &value);
g_value_unset(&value);
}
template<typename T> T
getProperty(void* object, const gchar* name)
{
T::this_is_unimplemented;
}
template<> bool
getProperty<bool>(void* object, const gchar* name)
{
GValue value;
memset(&value, 0x00, sizeof(GValue));
g_value_init(&value, G_TYPE_BOOLEAN);
g_object_get_property(G_OBJECT(object), name, &value);
gboolean returnValue = g_value_get_boolean(&value);
g_value_reset(&value);
return returnValue;
}
CFMController::CFMController(QDeclarativeContext* context):
_context(context),
_connection(NULL),
_playbin(NULL),
_statusText(""),
_bufferFillRate(-1),
_playPending(false),
_connected(false)
{
Q_ASSERT(context);
DBusConnection *systembus = dbus_bus_get(DBUS_BUS_SYSTEM, NULL);
if (!systembus) {
qFatal("Could not connect to the D-Bus system bus");
}
dbus_connection_setup_with_g_main(systembus, NULL);
if ((_connection = con_ic_connection_new ()) == NULL) {
qFatal("Coult not create ConIcConnection object");
}
g_signal_connect(G_OBJECT(_connection), "connection-event",
G_CALLBACK(CFMController::handleConnectionEvent), this);
::setProperty(_connection, "automatic-connection-events", true);
// Register the controller in the QML context.
_context->setContextProperty("controller", this);
}
GstElement* CFMController::gstPipeline()
{
if (!_playbin) {
if ((_playbin = gst_element_factory_make("playbin2", "playbin")) == NULL) {
qFatal("Could not create GStreamer playbin2 element");
}
g_signal_connect(gst_pipeline_get_bus(GST_PIPELINE(_playbin)), "message",
G_CALLBACK(CFMController::handleGstMessage), this);
::setProperty(_playbin, "uri", CUACFM_STREAM_URL);
qDebug("gstreamer: created playbin2 element");
}
return _playbin;
}
void CFMController::destroyGstPipeline()
{
if (_playbin) {
gst_element_set_state(_playbin, GST_STATE_PAUSED);
gst_object_unref(_playbin);
_bufferFillRate = -1;
_playbin = NULL;
qDebug("gstreamer: destroyed playbin2 element");
}
}
CFMController::~CFMController()
{
destroyGstPipeline();
g_object_unref(_connection);
}
bool CFMController::isMuted() const
{
return _playbin ? ::getProperty<bool>(_playbin, "mute") : false;
}
void CFMController::setMuted(bool muteValue)
{
if (_playbin) {
::setProperty(_playbin, "mute", muteValue);
emit mutedStatusChanged(muteValue);
updateStatusText();
}
}
bool CFMController::isPlaying() const
{
if (!_playbin)
return false;
if (_playPending)
return false;
GstState state;
GstState nextState;
gst_element_get_state(_playbin,
&state,
&nextState,
GST_CLOCK_TIME_NONE);
/*
* If the element is pending to transition to a different state,
* use the next state as reference, because GStreamer will be
* changing it behind our back to that.
*/
if (nextState != GST_STATE_VOID_PENDING)
state = nextState;
switch (state) {
case GST_STATE_NULL: /* Initial state (of course, not playing) */
case GST_STATE_READY: /* Ready to go to pause, but not playing either. */
case GST_STATE_PAUSED:
return false;
case GST_STATE_PLAYING:
return true;
default:
qCritical("Unrecognized GStreamer pipeline state!\n"
"CMFController::isPlaying() returning false anyway");
return false;
}
}
void CFMController::setPlaying(bool playingValue)
{
if (playingValue) {
if (!isNetworkAvailable()) {
if (!_playPending) {
qDebug("playback: no network, requesting -> pending");
_playPending = true;
setNetworkAvailable(true);
}
else {
qDebug("playback: no network, still pending...");
}
}
else {
qDebug("playback: network available -> playing");
_playPending = false;
gst_element_set_state(gstPipeline(), GST_STATE_PLAYING);
emit playingStatusChanged(true);
}
}
else {
qDebug("playback: stopped");
_playPending = false;
destroyGstPipeline();
emit playingStatusChanged(false);
}
updateStatusText();
}
bool CFMController::isBuffering() const
{
return _playbin && _bufferFillRate >= 0 && _bufferFillRate < 100;
}
int CFMController::getBufferingStatus() const
{
return _bufferFillRate;
}
void CFMController::handleGstMessage(GstBus *bus,
GstMessage *message,
gpointer controllerptr)
{
CFMController *controller = (CFMController*) controllerptr;
Q_ASSERT(controller);
Q_ASSERT(controller->_playbin);
Q_UNUSED(bus);
switch (GST_MESSAGE_TYPE(message)) {
/*
* Update the buffering status and handle pausing the playback when
* the fill rate of the buffer is below 100% -- recommended in docs.
*/
case GST_MESSAGE_BUFFERING: {
bool wasBuffering = controller->isBuffering();
gst_message_parse_buffering(message, &controller->_bufferFillRate);
controller->emit bufferingStatusChanged(controller->_bufferFillRate);
if (wasBuffering != controller->isBuffering())
controller->emit bufferingChanged(controller->isBuffering());
controller->updateStatusText();
qDebug("Buffering: %u%%", controller->_bufferFillRate);
if (controller->_bufferFillRate < 100 && controller->isPlaying())
controller->setPlaying(false);
else if (!controller->isPlaying())
controller->setPlaying(true);
break;
}
/*
* Theorically the stream is infinite, still EOS may be received
* e.g. if the server closes the connection. Handle it by pausing
* the playback.
*/
case GST_MESSAGE_EOS:
controller->setPlaying(false);
break;
/*
* Errors are both printed printed to stderr and signaled.
* Warnings are printed out to stderr using qWarning().
*/
case GST_MESSAGE_WARNING:
case GST_MESSAGE_ERROR: {
gchar *debuginfo = NULL;
GError *error = NULL;
// Note that playback must be stopped on errors.
if (GST_MESSAGE_TYPE(message) == GST_MESSAGE_ERROR) {
gst_message_parse_error(message, &error, &debuginfo);
controller->setPlaying(false);
}
else {
gst_message_parse_warning(message, &error, &debuginfo);
}
qWarning("GStreamer: %s", error->message);
qDebug (" - debug: %s", debuginfo);
if (GST_MESSAGE_TYPE(message) == GST_MESSAGE_ERROR)
controller->emit playbackError(QString(error->message));
g_error_free(error);
g_free(debuginfo);
break;
}
default: /* For the rest of messages, do nothing. */
break;
}
}
bool CFMController::isNetworkAvailable() const
{
return _connected;
}
void CFMController::setNetworkAvailable(bool availability)
{
if (!_connected && availability) {
qDebug("network: connection requested");
if (!con_ic_connection_connect(_connection, CON_IC_CONNECT_FLAG_NONE))
qFatal("Failed sending D-Bus message to connection manager");
}
}
void CFMController::handleConnectionEvent(ConIcConnection *connection,
ConIcConnectionEvent *event,
gpointer controllerptr)
{
CFMController *controller = (CFMController*) controllerptr;
Q_ASSERT(controller);
Q_UNUSED(connection);
ConIcConnectionStatus status = con_ic_connection_event_get_status(event);
switch (status) {
case CON_IC_STATUS_CONNECTED:
qDebug("network: connected");
// If playing was requested and we were waiting for a connection
// event, start playing now.
controller->emit networkAvailableChanged((controller->_connected = true));
if (controller->_playPending) {
controller->setPlaying(true);
controller->_playPending = false;
}
break;
case CON_IC_STATUS_DISCONNECTING:
qDebug("network: disconnecting...");
// If playing was enabled, then we need to pause and tell the
// user about the connection being lost.
//
// TODO: Show notification on connection lost.
controller->emit networkAvailableChanged((controller->_connected = false));
controller->setPlaying(false);
break;
case CON_IC_STATUS_NETWORK_UP:
qDebug("network: connecting...");
break;
case CON_IC_STATUS_DISCONNECTED:
qDebug("network: disconnected");
break;
}
controller->updateStatusText();
}
void CFMController::updateStatusText()
{
static const QString bufferingText(tr("Buffering... %1%"));
static const QString mutedText(tr("%1 - Muted"));
QString newText;
if (_connected) {
if (isBuffering())
newText = bufferingText.arg(getBufferingStatus());
else if (isPlaying())
newText = tr("Playing");
else
newText = tr("Paused");
}
else {
// No connection
if (_playPending)
newText = tr("Connecting...");
else
newText = tr("Disconnected");
}
if (isMuted())
newText = mutedText.arg(newText);
if (newText != _statusText)
emit statusTextChanged((_statusText = newText));
}
const QString& CFMController::getStatusText() const
{
return _statusText;
}
void CFMController::openStoreClient(const QString& url) const
{
// Based on
// https://gitorious.org/n9-apps-client/n9-apps-client/blobs/master/daemon/notificationhandler.cpp#line178
QDBusInterface storeif(STORE_DBUS_IFACE, "/", STORE_DBUS_IFACE,
QDBusConnection::sessionBus());
QStringList params;
params << url;
storeif.asyncCall("LaunchWithLink", QVariant::fromValue(params));
}