NotchFilterPlugin.cpp

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/***************************************************************************
      NotchFilterPlugin.cpp  -  Plugin for simple notch filtering
                             -------------------
    begin                : Thu Jun 19 2003
    copyright            : (C) 2003 by Dave Flogeras
    email                : d.flogeras@unb.ca
 ***************************************************************************/

/***************************************************************************
 *                                                                         *
 *   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 <QStringList>

#include <KLocalizedString>

#include "NotchFilter.h"
#include "NotchFilterDialog.h"
#include "NotchFilterPlugin.h"
#include "libkwave/MultiTrackSource.h"

KWAVE_PLUGIN(notch_filter, NotchFilterPlugin)

//***************************************************************************
Kwave::NotchFilterPlugin::NotchFilterPlugin(QObject *parent,
                                            const QVariantList &args)
    :Kwave::FilterPlugin(parent, args),
     m_frequency(3500.0), m_last_freq(100), m_bw(100), m_last_bw(200)
{
}

//***************************************************************************
Kwave::NotchFilterPlugin::~NotchFilterPlugin()
{
}

//***************************************************************************
int Kwave::NotchFilterPlugin::interpreteParameters(QStringList &params)
{
    bool ok;
    QString param;

    // evaluate the parameter list
    if (params.count() != 2) return -EINVAL;

    param = params[0];
    m_frequency = param.toDouble(&ok);
    Q_ASSERT(ok);
    if (!ok) return -EINVAL;

    param = params[1];
    m_bw = param.toDouble(&ok);
    Q_ASSERT(ok);
    if (!ok) return -EINVAL;

    return 0;
}

//***************************************************************************
Kwave::PluginSetupDialog *Kwave::NotchFilterPlugin::createDialog(QWidget *parent)
{
    Kwave::NotchFilterDialog *dialog =
        new Kwave::NotchFilterDialog(parent, signalRate());
    Q_ASSERT(dialog);
    if (!dialog) return Q_NULLPTR;

    // connect the signals for detecting value changes in pre-listen mode
    connect(dialog, SIGNAL(freqChanged(double)),
            this, SLOT(setFreqValue(double)));
    connect(dialog, SIGNAL(bwChanged(double)),
            this, SLOT(setBwValue(double)));
    return dialog;
}

//***************************************************************************
Kwave::SampleSource *Kwave::NotchFilterPlugin::createFilter(unsigned int tracks)
{
    return new Kwave::MultiTrackSource<Kwave::NotchFilter, true>(tracks);
}

//***************************************************************************
bool Kwave::NotchFilterPlugin::paramsChanged()
{
    return (!qFuzzyCompare(m_frequency, m_last_freq) ||
            !qFuzzyCompare(m_bw, m_last_bw));
}

//***************************************************************************
void Kwave::NotchFilterPlugin::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));

    if (!qFuzzyCompare(m_bw, m_last_bw) || force)
        filter->setAttribute(SLOT(setBandwidth(QVariant)),
            QVariant((m_bw * 2.0 * M_PI) / sr));

    m_last_freq  = m_frequency;
    m_last_bw    = m_bw;
}

//***************************************************************************
QString Kwave::NotchFilterPlugin::actionName()
{
    return i18n("Notch Filter");
}

//***************************************************************************
void Kwave::NotchFilterPlugin::setFreqValue(double frequency)
{
    m_frequency = frequency;
}

//***************************************************************************
void Kwave::NotchFilterPlugin::setBwValue(double bw)
{
    m_bw = bw;
}

//***************************************************************************
#include "NotchFilterPlugin.moc"
//***************************************************************************
//***************************************************************************