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Filter.cpp
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Filter.cpp
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/*
ZynAddSubFX - a software synthesizer
Filter.cpp - 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 or later) 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <cmath>
#include <cstdio>
#include <cassert>
#include "Filter.h"
#include "AnalogFilter.h"
#include "FormantFilter.h"
#include "SVFilter.h"
#include "../Params/FilterParams.h"
#include "../Misc/Allocator.h"
Filter::Filter(unsigned int srate, int bufsize)
: outgain(1.0f),
samplerate(srate),
buffersize(bufsize)
{
alias();
}
Filter *Filter::generate(Allocator &memory, const FilterParams *pars,
unsigned int srate, int bufsize)
{
assert(srate != 0);
assert(bufsize != 0);
unsigned char Ftype = pars->Ptype;
unsigned char Fstages = pars->Pstages;
Filter *filter;
switch(pars->Pcategory) {
case 1:
filter = memory.alloc<FormantFilter>(pars, &memory, srate, bufsize);
break;
case 2:
filter = memory.alloc<SVFilter>(Ftype, 1000.0f, pars->getq(), Fstages, srate, bufsize);
filter->outgain = dB2rap(pars->getgain());
if(filter->outgain > 1.0f)
filter->outgain = sqrt(filter->outgain);
break;
default:
filter = memory.alloc<AnalogFilter>(Ftype, 1000.0f, pars->getq(), Fstages, srate, bufsize);
if((Ftype >= 6) && (Ftype <= 8))
filter->setgain(pars->getgain());
else
filter->outgain = dB2rap(pars->getgain());
break;
}
return filter;
}
float Filter::getrealfreq(float freqpitch)
{
return powf(2.0f, freqpitch + 9.96578428f); //log2(1000)=9.95748f
}