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/******************************************************************************
*
* Copyright (c) 2011 Nokia Corporation and/or its subsidiary(-ies).
* All rights reserved.
* Contact: Nokia Corporation (qt-info@nokia.com)
*
* $QT_BEGIN_LICENSE:BSD$
* 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 the author organization 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 <COPYRIGHT HOLDER> 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
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