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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 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
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