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/****************************************************************************
**
** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/
**
** This file is part of the demonstration applications of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and Digia. For licensing terms and
** conditions see http://qt.digia.com/licensing. For further information
** use the contact form at http://qt.digia.com/contact-us.
**
** GNU Lesser General Public License Usage
** Alternatively, 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, Digia gives you certain additional
** rights. These rights are described in the Digia 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.
**
**
** $QT_END_LICENSE$
**
****************************************************************************/
#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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