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Filter.C

/*
  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 = sqrtf (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 (powf (2.0, freqpitch + 9.96578428));      //log2(1000)=9.95748
  else
    return (freqpitch);
};

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