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/***************************************************************************
Osc.cpp - simple sine oscillator
-------------------
begin : Tue Nov 06 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 <math.h>
#include "libkwave/modules/Osc.h"
//***************************************************************************
Kwave::Osc::Osc()
:Kwave::SampleSource(),
m_buffer(blockSize()), m_omega_t(0.0), m_f(44.1), m_a(1.0)
{
}
//***************************************************************************
Kwave::Osc::~Osc()
{
}
//***************************************************************************
void Kwave::Osc::goOn()
{
unsigned int samples = m_buffer.size();
const double two_pi = 2.0 * M_PI;
Q_ASSERT(!qFuzzyIsNull(m_f));
if (qFuzzyIsNull(m_f)) return;
double omega = two_pi / m_f;
for (unsigned int sample = 0; sample < samples; sample++) {
// calculate one sample as sin(w * t)
m_buffer[sample] = double2sample(m_a * sin(m_omega_t));
// next time, t++
m_omega_t += omega;
// limit the argument of sin() to [0 ... 4*Pi]
while (m_omega_t > two_pi)
m_omega_t -= two_pi;
}
emit output(m_buffer);
}
//***************************************************************************
void Kwave::Osc::setFrequency(const QVariant &f)
{
m_f = QVariant(f).toDouble();
}
//***************************************************************************
void Kwave::Osc::setPhase(const QVariant &p)
{
m_omega_t = QVariant(p).toDouble();
}
//***************************************************************************
void Kwave::Osc::setAmplitude(const QVariant &a)
{
m_a = QVariant(a).toDouble();
}
//***************************************************************************
//***************************************************************************
#include "moc_Osc.cpp"
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