/*
  ZynAddSubFX - a software synthesizer
 
  Filter.C - Filters, uses analog,formant,etc. filters
  Copyright (C) 2002-2005 Nasca Octavian Paul
  Author: Nasca Octavian Paul

  This program is free software; you can redistribute it and/or modify
  it under the terms of version 2 of the GNU General Public License 
  as published by the Free Software Foundation.

  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 (version 2) for more details.

  You should have received a copy of the GNU General Public License (version 2)
  along with this program; if not, write to the Free Software Foundation,
  Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA

*/

#include <math.h>
#include <stdio.h>

#include "Filter.h"

Filter::Filter(FilterParams *pars){
    unsigned char Ftype=pars->Ptype;
    unsigned char Fstages=pars->Pstages;
    
    category=pars->Pcategory;
    
    switch (category) {
	case 1:filter=new FormantFilter(pars);
		break;
	case 2:filter=new SVFilter(Ftype,1000.0,pars->getq(),Fstages);
	       filter->outgain=dB2rap(pars->getgain());		
	       if (filter->outgain>1.0) filter->outgain=sqrt(filter->outgain);
		break;
	default:filter=new AnalogFilter(Ftype,1000.0,pars->getq(),Fstages);
		if ((Ftype>=6)&&(Ftype<=8)) filter->setgain(pars->getgain());
		    else filter->outgain=dB2rap(pars->getgain());		
		break;
    };
};

Filter::~Filter(){
    delete (filter);
};

void Filter::filterout(REALTYPE *smp){
    filter->filterout(smp);
};

void Filter::setfreq(REALTYPE frequency){
    filter->setfreq(frequency);
};

void Filter::setfreq_and_q(REALTYPE frequency,REALTYPE q_){
    filter->setfreq_and_q(frequency,q_);
};

void Filter::setq(REALTYPE q_){
    filter->setq(q_);
};

REALTYPE Filter::getrealfreq(REALTYPE freqpitch){
    if ((category==0)||(category==2)) return(pow(2.0,freqpitch+9.96578428));//log2(1000)=9.95748
	else return(freqpitch);
};