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diff --git a/src/gsttools/qgstvideorendererplugin_p.h b/src/gsttools/qgstvideorendererplugin_p.h
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+/****************************************************************************
+**
+** Copyright (C) 2016 Jolla Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://www.qt.io/contact-us.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 3 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL3 included in the
+** packaging of this file. Please review the following information to
+** ensure the GNU Lesser General Public License version 3 requirements
+** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 2.0 or (at your option) the GNU General
+** Public license version 3 or any later version approved by the KDE Free
+** Qt Foundation. The licenses are as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
+** included in the packaging of this file. Please review the following
+** information to ensure the GNU General Public License requirements will
+** be met: https://www.gnu.org/licenses/gpl-2.0.html and
+** https://www.gnu.org/licenses/gpl-3.0.html.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef QGSTVIDEORENDERERPLUGIN_P_H
+#define QGSTVIDEORENDERERPLUGIN_P_H
+
+//
+//  W A R N I N G
+//  -------------
+//
+// This file is not part of the Qt API. It exists purely as an
+// implementation detail. This header file may change from version to
+// version without notice, or even be removed.
+//
+// We mean it.
+//
+
+#include <private/qgsttools_global_p.h>
+#include <qabstractvideobuffer.h>
+#include <qvideosurfaceformat.h>
+#include <QtCore/qobject.h>
+#include <QtCore/qplugin.h>
+
+#include <gst/gst.h>
+
+QT_BEGIN_NAMESPACE
+
+class QAbstractVideoSurface;
+
+const QLatin1String QGstVideoRendererPluginKey("gstvideorenderer");
+
+class Q_GSTTOOLS_EXPORT QGstVideoRenderer
+{
+public:
+    virtual ~QGstVideoRenderer() {}
+
+    virtual GstCaps *getCaps(QAbstractVideoSurface *surface) = 0;
+    virtual bool start(QAbstractVideoSurface *surface, GstCaps *caps) = 0;
+    virtual void stop(QAbstractVideoSurface *surface) = 0;  // surface may be null if unexpectedly deleted.
+    virtual bool proposeAllocation(GstQuery *query) = 0;    // may be called from a thread.
+
+    virtual bool present(QAbstractVideoSurface *surface, GstBuffer *buffer) = 0;
+    virtual void flush(QAbstractVideoSurface *surface) = 0; // surface may be null if unexpectedly deleted.
+};
+
+/*
+    Abstract interface for video buffers allocation.
+*/
+class Q_GSTTOOLS_EXPORT QGstVideoRendererInterface
+{
+public:
+    virtual ~QGstVideoRendererInterface() {}
+
+    virtual QGstVideoRenderer *createRenderer() = 0;
+};
+
+#define QGstVideoRendererInterface_iid "org.qt-project.qt.gstvideorenderer/5.4"
+Q_DECLARE_INTERFACE(QGstVideoRendererInterface, QGstVideoRendererInterface_iid)
+
+class Q_GSTTOOLS_EXPORT QGstVideoRendererPlugin : public QObject, public QGstVideoRendererInterface
+{
+    Q_OBJECT
+    Q_INTERFACES(QGstVideoRendererInterface)
+public:
+    explicit QGstVideoRendererPlugin(QObject *parent = 0);
+    virtual ~QGstVideoRendererPlugin() {}
+
+    QGstVideoRenderer *createRenderer() override = 0;
+
+};
+
+QT_END_NAMESPACE
+
+#endif