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/***************************************************************************
LowPassPlugin.cpp - Plugin for simple lowpass filtering
-------------------
begin : Fri Mar 07 2003
copyright : (C) 2003 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 <errno.h>
#include <math.h>
#include <new>
#include <QStringList>
#include <KLocalizedString>
#include "LowPassDialog.h"
#include "LowPassFilter.h"
#include "LowPassPlugin.h"
#include "libkwave/MultiTrackSource.h"
KWAVE_PLUGIN(lowpass, LowPassPlugin)
//***************************************************************************
Kwave::LowPassPlugin::LowPassPlugin(QObject *parent,
const QVariantList &args)
:Kwave::FilterPlugin(parent, args),
m_frequency(3500.0), m_last_freq(100)
{
}
//***************************************************************************
Kwave::LowPassPlugin::~LowPassPlugin()
{
}
//***************************************************************************
int Kwave::LowPassPlugin::interpreteParameters(QStringList ¶ms)
{
bool ok;
QString param;
// evaluate the parameter list
if (params.count() != 1) return -EINVAL;
param = params[0];
m_frequency = param.toDouble(&ok);
Q_ASSERT(ok);
if (!ok) return -EINVAL;
return 0;
}
//***************************************************************************
Kwave::PluginSetupDialog *Kwave::LowPassPlugin::createDialog(QWidget *parent)
{
Kwave::LowPassDialog *dialog =
new(std::nothrow) Kwave::LowPassDialog(parent, signalRate());
Q_ASSERT(dialog);
if (!dialog) return nullptr;
// connect the signals for detecting value changes in pre-listen mode
connect(dialog, SIGNAL(changed(double)),
this, SLOT(setValue(double)));
return dialog;
}
//***************************************************************************
Kwave::SampleSource *Kwave::LowPassPlugin::createFilter(unsigned int tracks)
{
return new(std::nothrow)
Kwave::MultiTrackSource<Kwave::LowPassFilter, true>(tracks);
}
//***************************************************************************
bool Kwave::LowPassPlugin::paramsChanged()
{
return (!qFuzzyCompare(m_frequency, m_last_freq));
}
//***************************************************************************
void Kwave::LowPassPlugin::updateFilter(Kwave::SampleSource *filter,
bool force)
{
double sr = signalRate();
if (!filter) return;
if (!qFuzzyCompare(m_frequency, m_last_freq) || force)
filter->setAttribute(SLOT(setFrequency(QVariant)),
QVariant((m_frequency * 2.0 * M_PI) / sr));
m_last_freq = m_frequency;
}
//***************************************************************************
QString Kwave::LowPassPlugin::actionName()
{
return i18n("Low Pass");
}
//***************************************************************************
void Kwave::LowPassPlugin::setValue(double frequency)
{
m_frequency = frequency;
}
//***************************************************************************
#include "LowPassPlugin.moc"
//***************************************************************************
//***************************************************************************
#include "moc_LowPassPlugin.cpp"
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