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/* SpiralSound
* Copyleft (C) 2001 David Griffiths <dave@pawfal.org>
*
* 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.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#include "../SpiralPlugin.h"
#include <FL/Fl_Pixmap.H>
#include "iir_filter.h"
#ifndef FilterPLUGIN
#define FilterPLUGIN
static const int NUM_CHANNELS = 4;
class FilterPlugin : public SpiralPlugin
{
public:
FilterPlugin();
virtual ~FilterPlugin();
virtual PluginInfo &Initialise(const HostInfo *Host);
virtual SpiralGUIType *CreateGUI();
virtual void Execute();
virtual void StreamOut(std::ostream &s);
virtual void StreamIn(std::istream &s);
void Reset();
void SetupCoeffs();
double GetCutoff() {return fc;}
double GetResonance() {return Q;}
bool GetRevCutoffMod() {return m_RevCutoffMod;}
bool GetRevResonanceMod() {return m_RevResonanceMod;}
private:
// Voice specifics
FILTER iir;
// Voice independant
float *coef;
float fs, fc; // Sampling frequency, cutoff frequency
float Q; // Resonance > 1.0 < 1000
float m_LastFC;
float m_LastQ;
unsigned nInd;
double a0, a1, a2, b0, b1, b2;
double k; // overall gain factor
bool m_RevCutoffMod;
bool m_RevResonanceMod;
friend std::istream &operator>>(std::istream &s, FilterPlugin &o);
friend std::ostream &operator<<(std::ostream &s, FilterPlugin &o);
};
std::istream &operator>>(std::istream &s, FilterPlugin &o);
std::ostream &operator<<(std::ostream &s, FilterPlugin &o);
#endif
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