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/*
Copyright (C) 2010 George Kiagiadakis <kiagiadakis.george@gmail.com>
This library 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 program 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 this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "bus.h"
#include "message.h"
#include "../QGlib/signal.h"
#include <gst/gst.h>
#include <QtCore/QObject>
#include <QtCore/QTimerEvent>
#include <QtCore/QHash>
#include <QtCore/QBasicTimer>
namespace QGst {
namespace Private {
class BusWatch : public QObject
{
public:
BusWatch(GstBus *bus)
: QObject(), m_bus(bus)
{
m_timer.start(50, this);
}
void stop()
{
m_timer.stop();
}
private:
virtual void timerEvent(QTimerEvent *event)
{
if (event->timerId() == m_timer.timerId()) {
dispatch();
} else {
QObject::timerEvent(event);
}
}
void dispatch()
{
GstMessage *message;
gst_object_ref(m_bus);
while((message = gst_bus_pop(m_bus)) != NULL) {
MessagePtr msg = MessagePtr::wrap(message, false);
QGlib::Quark detail = gst_message_type_to_quark(static_cast<GstMessageType>(msg->type()));
QGlib::emitWithDetail<void>(m_bus, "message", detail, msg);
}
gst_object_unref(m_bus);
}
GstBus *m_bus;
QBasicTimer m_timer;
};
class BusWatchManager
{
public:
void addWatch(GstBus *bus)
{
if (m_watches.contains(bus)) {
m_watches[bus].second++; //reference count
} else {
m_watches.insert(bus, qMakePair(new BusWatch(bus), uint(1)));
g_object_weak_ref(G_OBJECT(bus), &BusWatchManager::onBusDestroyed, this);
}
}
void removeWatch(GstBus *bus)
{
if (m_watches.contains(bus) && --m_watches[bus].second == 0) {
m_watches[bus].first->stop();
m_watches[bus].first->deleteLater();
m_watches.remove(bus);
g_object_weak_unref(G_OBJECT(bus), &BusWatchManager::onBusDestroyed, this);
}
}
private:
static void onBusDestroyed(gpointer selfPtr, GObject *busPtr)
{
BusWatchManager *self = static_cast<BusWatchManager*>(selfPtr);
GstBus *bus = reinterpret_cast<GstBus*>(busPtr);
//we cannot call removeWatch() here because g_object_weak_unref will complain
self->m_watches[bus].first->stop();
self->m_watches[bus].first->deleteLater();
self->m_watches.remove(bus);
}
QHash< GstBus*, QPair<BusWatch*, uint> > m_watches;
};
Q_GLOBAL_STATIC(Private::BusWatchManager, s_watchManager)
} //namespace Private
//static
BusPtr Bus::create()
{
GstBus *bus = gst_bus_new();
if (bus) {
gst_object_ref_sink(bus);
}
return BusPtr::wrap(bus, false);
}
bool Bus::hasPendingMessages() const
{
return gst_bus_have_pending(object<GstBus>());
}
MessagePtr Bus::peek() const
{
return MessagePtr::wrap(gst_bus_peek(object<GstBus>()), false);
}
MessagePtr Bus::pop(ClockTime timeout)
{
return MessagePtr::wrap(gst_bus_timed_pop(object<GstBus>(), timeout), false);
}
MessagePtr Bus::pop(MessageType type, ClockTime timeout)
{
return MessagePtr::wrap(gst_bus_timed_pop_filtered(object<GstBus>(), timeout,
static_cast<GstMessageType>(type)), false);
}
bool Bus::post(const MessagePtr & message)
{
return gst_bus_post(object<GstBus>(), gst_message_copy(message));
}
void Bus::setFlushing(bool flush)
{
gst_bus_set_flushing(object<GstBus>(), flush);
}
void Bus::addSignalWatch()
{
Private::s_watchManager()->addWatch(object<GstBus>());
}
void Bus::removeSignalWatch()
{
Private::s_watchManager()->removeWatch(object<GstBus>());
}
void Bus::enableSyncMessageEmission()
{
gst_bus_enable_sync_message_emission(object<GstBus>());
}
void Bus::disableSyncMessageEmission()
{
gst_bus_disable_sync_message_emission(object<GstBus>());
}
} //namespace QGst
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