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+/****************************************************************************
+**
+** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** This file is part of the QtDeclarative module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:BSD$
+** You may use this file under the terms of the BSD license as follows:
+**
+** "Redistribution and use in source and binary forms, with or without
+** modification, are permitted provided that the following conditions are
+** met:
+**   * Redistributions of source code must retain the above copyright
+**     notice, this list of conditions and the following disclaimer.
+**   * Redistributions in binary form must reproduce the above copyright
+**     notice, this list of conditions and the following disclaimer in
+**     the documentation and/or other materials provided with the
+**     distribution.
+**   * Neither the name of Nokia Corporation and its Subsidiary(-ies) nor
+**     the names of its contributors may be used to endorse or promote
+**     products derived from this software without specific prior written
+**     permission.
+**
+** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef VOICEGENERATOR_H
+#define VOICEGENERATOR_H
+
+#include <QIODevice>
+#include <QByteArray>
+#include <QAudioFormat>
+#include <QtCore/qmath.h>
+#include <QtCore/qendian.h>
+#include <QDebug>
+
+#include "constants.h"
+
+
+class VoiceGenerator : public QIODevice
+{
+    Q_OBJECT
+public:
+    VoiceGenerator(const QAudioFormat &format, qreal frequency, qreal amplitude, QObject *parent = 0);
+    ~VoiceGenerator();
+    void setFrequency(qreal frequency);
+    qint64 readData(char *data, qint64 maxlen);
+    qint64 writeData(const char *data, qint64 maxlen);
+    qint64 bytesAvailable() const;
+    qreal frequency();
+signals:
+
+public slots:
+    void setAmplitude(qreal amplitude);
+    void start();
+    void stop();
+
+private:
+    void setValue(uchar *ptr, qreal realValue);
+    void refreshData();
+    const QAudioFormat m_format;
+    // buffer to store the data
+    QByteArray m_buffer;
+    // current position in buffer
+    qint64 m_position;
+    // max position depends on the sample rate of format and the frequency of voice
+    qint64 m_max_position;
+    qreal m_amplitude;
+    qreal m_frequency;
+};
+
+#endif // VOICEGENERATOR_H