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/*************************************************************************
NoiseGenerator.cpp - simple noise generator, implemented as SampleSource
-------------------
begin : Sun Oct 07 2007
copyright : (C) 2007 by Thomas Eschenbacher
email : Thomas.Eschenbacher@gmx.de
***************************************************************************/
/***************************************************************************
* *
* This program is free software; you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation; either version 2 of the License, or *
* (at your option) any later version. *
* *
***************************************************************************/
#include "config.h"
#include <QtGlobal>
#include "NoiseGenerator.h"
#include "libkwave/Sample.h"
//***************************************************************************
Kwave::NoiseGenerator::NoiseGenerator(QObject *parent)
:Kwave::SampleSource(parent),
m_random(),
m_buffer(blockSize()),
m_noise_level(1.0)
{
}
//***************************************************************************
Kwave::NoiseGenerator::~NoiseGenerator()
{
}
//***************************************************************************
void Kwave::NoiseGenerator::goOn()
{
emit output(m_buffer);
}
//***************************************************************************
void Kwave::NoiseGenerator::input(Kwave::SampleArray data)
{
bool ok = m_buffer.resize(data.size());
Q_ASSERT(ok);
Q_UNUSED(ok)
m_buffer = data;
const quint32 max = m_random.max();
const quint32 m_2 = max / 2;
const double alpha = (1.0 - m_noise_level);
const double scale = (m_noise_level * 2.0) / static_cast<double>(max);
for (unsigned i = 0; i < data.size(); ++i) {
const Kwave::SampleArray &in = data;
m_buffer[i] = double2sample(
(sample2double(in[i]) * alpha) +
(qint32(m_random.generate() - m_2) * scale)
);
}
}
//***************************************************************************
void Kwave::NoiseGenerator::setNoiseLevel(const QVariant fc)
{
m_noise_level = QVariant(fc).toDouble();
}
//***************************************************************************
//***************************************************************************
#include "moc_NoiseGenerator.cpp"
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