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/***************************************************************************
LowPassPlugin.h - 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. *
* *
***************************************************************************/
#ifndef _LOW_PASS_PLUGIN_H_
#define _LOW_PASS_PLUGIN_H_
#include "config.h"
#include <QObject>
#include <QString>
#include <QStringList>
#include "libkwave/PluginSetupDialog.h"
#include "libkwave/Plugin.h"
#include "libgui/FilterPlugin.h"
class QStringList;
namespace Kwave { class KwaveSampleSource; }
class LowPassPlugin: public Kwave::FilterPlugin
{
Q_OBJECT
public:
/** Constructor */
LowPassPlugin(const PluginContext &context);
/** Destructor */
virtual ~LowPassPlugin();
/** Creates the setup dialog and connects it's signals */
virtual KwavePluginSetupDialog *createDialog(QWidget *parent);
/**
* Creates a multi-track filter with the given number of tracks
* @param tracks number of tracks that the filter should have
* @return pointer to the filter or null if failed
*/
virtual Kwave::SampleSource *createFilter(unsigned int tracks);
/**
* Returns true if the parameters have changed during pre-listen.
*/
virtual bool paramsChanged();
/**
* Update the filter with new parameters if it has changed
* changed during the pre-listen.
* @param filter the Kwave::SampleSource to be updated, should be the
* same one as created with createFilter()
* @param force if true, even update if no settings have changed
*/
virtual void updateFilter(Kwave::SampleSource *filter, bool force=0);
/**
* Returns a verbose name of the performed action. Used for giving
* the undo action a readable name.
*/
virtual QString actionName();
protected:
/** Reads values from the parameter list */
virtual int interpreteParameters(QStringList &params);
protected slots:
/**
* Called when the parameter changed during pre-listen
* @param frequency the frequency parameter in Hz
*/
void setValue(double frequency);
private:
/** cutoff frequency [Hz] */
double m_frequency;
/** last value of m_frequency */
double m_last_freq;
};
#endif /* _LOW_PASS_PLUGIN_H_ */