Moved general gstreamer helper classes into separate library.

Cleaned up configuration of gstreamer with a separate config
test.

Change-Id: I1ec9ee466233687fbcfdc544a12d9fce578e4379
Reviewed-on: http://codereview.qt-project.org/6459
Sanity-Review: Qt Sanity Bot <qt_sanity_bot@ovi.com>
Reviewed-by: Michael Goddard <michael.goddard@nokia.com>

1 files changed, 237 insertions, 0 deletions

diff --git a/src/gsttools/qgstreamerbushelper.cpp b/src/gsttools/qgstreamerbushelper.cpp
new file mode 100644
index 000000000..211c364df
--- /dev/null
+++ b/src/gsttools/qgstreamerbushelper.cpp
@@ -0,0 +1,237 @@
+/****************************************************************************
+**
+** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** This file is part of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** GNU Lesser General Public License Usage
+** This file may be used under the terms of the GNU Lesser General Public
+** License version 2.1 as published by the Free Software Foundation and
+** appearing in the file LICENSE.LGPL included in the packaging of this
+** file. Please review the following information to ensure the GNU Lesser
+** General Public License version 2.1 requirements will be met:
+** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain additional
+** rights. These rights are described in the Nokia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU General
+** Public License version 3.0 as published by the Free Software Foundation
+** and appearing in the file LICENSE.GPL included in the packaging of this
+** file. Please review the following information to ensure the GNU General
+** Public License version 3.0 requirements will be met:
+** http://www.gnu.org/copyleft/gpl.html.
+**
+** Other Usage
+** Alternatively, this file may be used in accordance with the terms and
+** conditions contained in a signed written agreement between you and Nokia.
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include <QtCore/qmap.h>
+#include <QtCore/qtimer.h>
+#include <QtCore/qmutex.h>
+#include <QtCore/qlist.h>
+
+#include "qgstreamerbushelper_p.h"
+
+
+#ifndef QT_NO_GLIB
+class QGstreamerBusHelperPrivate : public QObject
+{
+    Q_OBJECT
+
+public:
+    void addWatch(GstBus* bus, QGstreamerBusHelper* helper)
+    {
+        setParent(helper);
+        m_tag = gst_bus_add_watch_full(bus, 0, busCallback, this, NULL);
+        m_helper = helper;
+    }
+
+    void removeWatch(QGstreamerBusHelper* helper)
+    {
+        Q_UNUSED(helper);
+        g_source_remove(m_tag);
+    }
+
+    static QGstreamerBusHelperPrivate* instance()
+    {
+        return new QGstreamerBusHelperPrivate;
+    }
+
+private:
+    void processMessage(GstBus* bus, GstMessage* message)
+    {
+        Q_UNUSED(bus);
+        QGstreamerMessage msg(message);
+        foreach (QGstreamerBusMessageFilter *filter, busFilters) {
+            if (filter->processBusMessage(msg))
+                break;
+        }
+        emit m_helper->message(msg);
+    }
+
+    static gboolean busCallback(GstBus *bus, GstMessage *message, gpointer data)
+    {
+        reinterpret_cast<QGstreamerBusHelperPrivate*>(data)->processMessage(bus, message);
+        return TRUE;
+    }
+
+    guint       m_tag;
+    QGstreamerBusHelper*  m_helper;
+
+public:
+    GstBus* bus;
+    QMutex filterMutex;
+    QList<QGstreamerSyncMessageFilter*> syncFilters;
+    QList<QGstreamerBusMessageFilter*> busFilters;
+};
+
+#else
+
+class QGstreamerBusHelperPrivate : public QObject
+{
+    Q_OBJECT
+    typedef QMap<QGstreamerBusHelper*, GstBus*>   HelperMap;
+
+public:
+    void addWatch(GstBus* bus, QGstreamerBusHelper* helper)
+    {
+        m_helperMap.insert(helper, bus);
+
+        if (m_helperMap.size() == 1)
+            m_intervalTimer->start();
+    }
+
+    void removeWatch(QGstreamerBusHelper* helper)
+    {
+        m_helperMap.remove(helper);
+
+        if (m_helperMap.size() == 0)
+            m_intervalTimer->stop();
+    }
+
+    static QGstreamerBusHelperPrivate* instance()
+    {
+        static QGstreamerBusHelperPrivate self;
+
+        return &self;
+    }
+
+private slots:
+    void interval()
+    {
+        for (HelperMap::iterator it = m_helperMap.begin(); it != m_helperMap.end(); ++it) {
+            GstMessage* message;
+
+            while ((message = gst_bus_poll(it.value(), GST_MESSAGE_ANY, 0)) != 0) {
+                QGstreamerMessage msg(message);
+                foreach (QGstreamerBusMessageFilter *filter, busFilters) {
+                    if (filter->processBusMessage(msg))
+                        break;
+                }
+                emit it.key()->message(msg);
+
+                gst_message_unref(message);
+            }
+
+            emit it.key()->message(QGstreamerMessage());
+        }
+    }
+
+private:
+    QGstreamerBusHelperPrivate()
+    {
+        m_intervalTimer = new QTimer(this);
+        m_intervalTimer->setInterval(250);
+
+        connect(m_intervalTimer, SIGNAL(timeout()), SLOT(interval()));
+    }
+
+    HelperMap   m_helperMap;
+    QTimer*     m_intervalTimer;
+
+public:
+    GstBus* bus;
+    QMutex filterMutex;
+    QList<QGstreamerSyncMessageFilter*> syncFilters;
+    QList<QGstreamerBusMessageFilter*> busFilters;
+};
+#endif
+
+
+static GstBusSyncReply syncGstBusFilter(GstBus* bus, GstMessage* message, QGstreamerBusHelperPrivate *d)
+{
+    Q_UNUSED(bus);
+    QMutexLocker lock(&d->filterMutex);
+
+    foreach (QGstreamerSyncMessageFilter *filter, d->syncFilters) {
+        if (filter->processSyncMessage(QGstreamerMessage(message)))
+            return GST_BUS_DROP;
+    }
+
+    return GST_BUS_PASS;
+}
+
+
+/*!
+    \class gstreamer::QGstreamerBusHelper
+    \internal
+*/
+
+QGstreamerBusHelper::QGstreamerBusHelper(GstBus* bus, QObject* parent):
+    QObject(parent),
+    d(QGstreamerBusHelperPrivate::instance())
+{
+    d->bus = bus;
+    d->addWatch(bus, this);
+
+    gst_bus_set_sync_handler(bus, (GstBusSyncHandler)syncGstBusFilter, d);
+}
+
+QGstreamerBusHelper::~QGstreamerBusHelper()
+{
+    d->removeWatch(this);
+    gst_bus_set_sync_handler(d->bus,0,0);
+}
+
+void QGstreamerBusHelper::installMessageFilter(QObject *filter)
+{
+    QGstreamerSyncMessageFilter *syncFilter = qobject_cast<QGstreamerSyncMessageFilter*>(filter);
+    if (syncFilter) {
+        QMutexLocker lock(&d->filterMutex);
+        if (!d->syncFilters.contains(syncFilter))
+            d->syncFilters.append(syncFilter);
+    }
+
+    QGstreamerBusMessageFilter *busFilter = qobject_cast<QGstreamerBusMessageFilter*>(filter);
+    if (busFilter && !d->busFilters.contains(busFilter))
+        d->busFilters.append(busFilter);
+}
+
+void QGstreamerBusHelper::removeMessageFilter(QObject *filter)
+{
+    QGstreamerSyncMessageFilter *syncFilter = qobject_cast<QGstreamerSyncMessageFilter*>(filter);
+    if (syncFilter) {
+        QMutexLocker lock(&d->filterMutex);
+        d->syncFilters.removeAll(syncFilter);
+    }
+
+    QGstreamerBusMessageFilter *busFilter = qobject_cast<QGstreamerBusMessageFilter*>(filter);
+    if (busFilter)
+        d->busFilters.removeAll(busFilter);
+}
+
+#include "qgstreamerbushelper.moc"