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+/****************************************************************************
+**
+** Copyright (C) 2016 The Qt Company Ltd.
+** Copyright (C) 2016 Research In Motion
+** 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 QDECLARATIVEVIDEOOUTPUT_BACKEND_P_H
+#define QDECLARATIVEVIDEOOUTPUT_BACKEND_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 <QtCore/qpointer.h>
+#include <QtCore/qsize.h>
+#include <QtQuick/qquickitem.h>
+#include <QtQuick/qsgnode.h>
+#include <private/qtmultimediaquickdefs_p.h>
+
+QT_BEGIN_NAMESPACE
+
+class QAbstractVideoSurface;
+class QDeclarativeVideoOutput;
+class QMediaService;
+class QAbstractVideoFilter;
+
+class Q_MULTIMEDIAQUICK_EXPORT QDeclarativeVideoBackend
+{
+public:
+    explicit QDeclarativeVideoBackend(QDeclarativeVideoOutput *parent)
+        : q(parent)
+    {}
+
+    virtual ~QDeclarativeVideoBackend()
+    {}
+
+    virtual bool init(QMediaService *service) = 0;
+    virtual void releaseSource() = 0;
+    virtual void releaseControl() = 0;
+    virtual void itemChange(QQuickItem::ItemChange change,
+                            const QQuickItem::ItemChangeData &changeData) = 0;
+    virtual QSize nativeSize() const = 0;
+    virtual void updateGeometry() = 0;
+    virtual QSGNode *updatePaintNode(QSGNode *oldNode, QQuickItem::UpdatePaintNodeData *data) = 0;
+    virtual QAbstractVideoSurface *videoSurface() const = 0;
+
+    // The viewport, adjusted for the pixel aspect ratio
+    virtual QRectF adjustedViewport() const = 0;
+
+    virtual void appendFilter(QAbstractVideoFilter *filter) { Q_UNUSED(filter); }
+    virtual void clearFilters() { }
+
+    virtual void releaseResources() { }
+    virtual void invalidateSceneGraph() { }
+
+protected:
+    QDeclarativeVideoOutput *q;
+    QPointer<QMediaService> m_service;
+};
+
+class QDeclarativeVideoBackendFactoryInterface
+{
+public:
+    virtual QDeclarativeVideoBackend *create(QDeclarativeVideoOutput *parent) = 0;
+};
+
+#define QDeclarativeVideoBackendFactoryInterface_iid "org.qt-project.qt.declarativevideobackendfactory/5.2"
+Q_DECLARE_INTERFACE(QDeclarativeVideoBackendFactoryInterface, QDeclarativeVideoBackendFactoryInterface_iid)
+
+/*
+ * Helper - returns true if the given orientation has the same aspect as the default (e.g. 180*n)
+ */
+namespace {
+
+inline bool qIsDefaultAspect(int o)
+{
+    return (o % 180) == 0;
+}
+
+/*
+ * Return the orientation normalized to 0-359
+ */
+inline int qNormalizedOrientation(int o)
+{
+    // Negative orientations give negative results
+    int o2 = o % 360;
+    if (o2 < 0)
+        o2 += 360;
+    return o2;
+}
+
+}
+
+QT_END_NAMESPACE
+
+#endif