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Diffstat (limited to 'plugins/multimedia/symbian/videooutput/s60videoframerate.h')
-rw-r--r-- | plugins/multimedia/symbian/videooutput/s60videoframerate.h | 89 |
1 files changed, 89 insertions, 0 deletions
diff --git a/plugins/multimedia/symbian/videooutput/s60videoframerate.h b/plugins/multimedia/symbian/videooutput/s60videoframerate.h new file mode 100644 index 0000000000..e501483ce5 --- /dev/null +++ b/plugins/multimedia/symbian/videooutput/s60videoframerate.h @@ -0,0 +1,89 @@ +/** +** 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 |