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/*
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 <assert.h>
#include "globals.h"
#include "filter_base.h"
#include "filter_parameters.h"
#include "analog_filter.h"
#include "sv_filter.h"
#include "formant_filter.h"
#include "filter.h"
void
Filter::init(float sample_rate, FilterParams *pars)
{
unsigned char Ftype=pars->Ptype;
m_category = pars->m_category;
switch (m_category)
{
case ZYN_FILTER_TYPE_FORMANT:
m_formant_filter.init(sample_rate, pars);
m_filter = &m_formant_filter;
break;
case ZYN_FILTER_TYPE_STATE_VARIABLE:
m_sv_filter.init(sample_rate, Ftype, 1000.0, pars->getq(), pars->m_additional_stages, pars->m_gain);
m_filter = &m_sv_filter;
break;
case ZYN_FILTER_TYPE_ANALOG:
m_analog_filter.init(sample_rate, Ftype, 1000.0, pars->getq(), pars->m_additional_stages, pars->m_gain);
m_filter = &m_analog_filter;
break;
default:
assert(0);
}
}
void Filter::filterout(REALTYPE *smp)
{
m_filter->filterout(smp);
}
void Filter::setfreq(REALTYPE frequency)
{
m_filter->setfreq(frequency);
}
void Filter::setfreq_and_q(REALTYPE frequency,REALTYPE q_)
{
m_filter->setfreq_and_q(frequency,q_);
}
void Filter::setq(REALTYPE q_)
{
m_filter->setq(q_);
}
REALTYPE
Filter::getrealfreq(REALTYPE freqpitch)
{
if (m_category == ZYN_FILTER_TYPE_ANALOG ||
m_category == ZYN_FILTER_TYPE_STATE_VARIABLE)
{
return pow(2.0,freqpitch+9.96578428); // log2(1000)=9.95748
}
else
{
return freqpitch;
}
}
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