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+/**
+** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** This file is part of the Qt Mobility Components.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** 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.
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef S60VIDEOFRAMERATE_H
+#define S60VIDEOFRAMERATE_H
+
+#include <QtCore/QObject>
+#include <QtCore/QString>
+#include <QtCore/QVector>
+
+class QElapsedTimer;
+class QTimer;
+
+/**
+ * Class for measuring video frame rate
+ *
+ * Delivery of a new video frame is notified by the client via the notify() slot.
+ * This class performs regular sampling of the event frequency and calculates a
+ * rolling average which is published via the frequency property.
+ */
+class S60VideoFrameRate : public QObject
+{
+ Q_OBJECT
+
+public:
+ S60VideoFrameRate(QObject *parent = 0);
+ ~S60VideoFrameRate();
+ qreal frequency() const;
+
+signals:
+ void frequencyChanged(qreal freq) const;
+
+public slots:
+ void notify();
+
+private slots:
+ void sample();
+ void trace();
+
+private:
+ QTimer *m_sampleTimer;
+ QTimer *m_traceTimer;
+ QScopedPointer<QElapsedTimer> m_elapsedTimer;
+ int m_count;
+ QVector<qreal> m_history;
+ int m_historyIndex;
+ int m_historyCount;
+ qreal m_frequencySum;
+ qreal m_frequency;
+};
+
+#endif // S60VIDEOFRAMERATE_H