[067375]: plugins / pitch_shift / PitchShiftPlugin.cpp Maximize Restore History

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PitchShiftPlugin.cpp    135 lines (109 with data), 4.5 kB

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/***************************************************************************
PitchShiftPlugin.cpp - plugin for modifying the "pitch_shift"
-------------------
begin : Sun Mar 23 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 <qstringlist.h>
#include <klocale.h>
#include "libkwave/KwaveMultiTrackSource.h"
#include "PitchShiftFilter.h"
#include "PitchShiftPlugin.h"
#include "PitchShiftDialog.h"
KWAVE_PLUGIN(PitchShiftPlugin,"pitch_shift","Thomas Eschenbacher");
//***************************************************************************
PitchShiftPlugin::PitchShiftPlugin(const PluginContext &context)
:Kwave::FilterPlugin(context),
m_speed(1.0), m_frequency(5.0), m_percentage_mode(false),
m_last_speed(0), m_last_freq(0)
{
i18n("pitch_shift");
}
//***************************************************************************
PitchShiftPlugin::~PitchShiftPlugin()
{
}
//***************************************************************************
int PitchShiftPlugin::interpreteParameters(QStringList &params)
{
bool ok;
QString param;
// evaluate the parameter list
if (params.count() != 3) return -EINVAL;
param = params[0];
m_speed = param.toDouble(&ok);
Q_ASSERT(ok);
if (!ok) return -EINVAL;
param = params[1];
m_frequency = param.toDouble(&ok);
Q_ASSERT(ok);
if (!ok) return -EINVAL;
param = params[2];
m_percentage_mode = (param.toUInt(&ok));
Q_ASSERT(ok);
if (!ok) return -EINVAL;
return 0;
}
//***************************************************************************
KwavePluginSetupDialog *PitchShiftPlugin::createDialog(QWidget *parent)
{
PitchShiftDialog *dialog = new PitchShiftDialog(parent);
Q_ASSERT(dialog);
if (!dialog) return 0;
// connect the signals for detecting value changes in pre-listen mode
connect(dialog, SIGNAL(changed(double,double)),
this, SLOT(setValues(double,double)));
return dialog;
}
//***************************************************************************
Kwave::SampleSource *PitchShiftPlugin::createFilter(unsigned int tracks)
{
return new Kwave::MultiTrackSource<PitchShiftFilter, true>(tracks);
}
//***************************************************************************
bool PitchShiftPlugin::paramsChanged()
{
return ((m_speed != m_last_speed) || (m_frequency != m_last_freq));
}
//***************************************************************************
void PitchShiftPlugin::updateFilter(Kwave::SampleSource *filter,
bool force)
{
double sr = signalRate();
if (!filter) return;
if ((m_frequency != m_last_freq) || force)
filter->setAttribute(SLOT(setFrequency(const QVariant &)),
QVariant((m_frequency * 2.0 * M_PI) / sr));
if ((m_speed != m_last_speed) || force)
filter->setAttribute(SLOT(setSpeed(const QVariant &)),
QVariant(m_speed));
m_last_freq = m_frequency;
m_last_speed = m_speed;
}
//***************************************************************************
QString PitchShiftPlugin::actionName()
{
return i18n("pitch shift");
}
//***************************************************************************
void PitchShiftPlugin::setValues(double speed, double frequency)
{
m_frequency = frequency;
m_speed = speed;
}
//***************************************************************************
#include "PitchShiftPlugin.moc"
//***************************************************************************
//***************************************************************************