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/*
FFTease - A set of Live Spectral Processors
Originally written by Eric Lyon and Christopher Penrose for the Max/MSP platform
Copyright (c)Thomas Grill (xovo@gmx.net)
For information on usage and redistribution, and for a DISCLAIMER OF ALL
WARRANTIES, see the file, "license.txt," in this distribution.
*/
#include "main.h"
#include <stdlib.h>
class scrape:
public fftease
{
FLEXT_HEADER_S(scrape,fftease,setup)
public:
scrape(I argc,const t_atom *argv);
protected:
virtual V Transform(I n,S *const *in);
F _thresh1,_thresh2;
F _knee,_cutoff;
F *_threshfunc;
V UpdThrFun();
private:
virtual V Set();
virtual V Clear();
virtual V Delete();
static V setup(t_classid c);
inline V ms_knee(F knee) { _knee = knee; UpdThrFun(); }
inline V ms_cutoff(F cutoff) { _cutoff = cutoff; UpdThrFun(); }
inline V ms_thresh1(F thr) { _thresh1 = thr; UpdThrFun(); }
inline V ms_thresh2(F thr) { _thresh2 = thr; UpdThrFun(); }
FLEXT_ATTRGET_F(_knee)
FLEXT_CALLSET_F(ms_knee)
FLEXT_ATTRGET_F(_cutoff)
FLEXT_CALLSET_F(ms_cutoff)
FLEXT_ATTRGET_F(_thresh1)
FLEXT_CALLSET_F(ms_thresh1)
FLEXT_ATTRGET_F(_thresh2)
FLEXT_CALLSET_F(ms_thresh2)
};
FLEXT_LIB_DSP_V("fftease, scrape~",scrape)
V scrape::setup(t_classid c)
{
FLEXT_CADDATTR_VAR(c,"knee",_knee,ms_knee);
FLEXT_CADDATTR_VAR(c,"cutoff",_cutoff,ms_cutoff);
FLEXT_CADDATTR_VAR(c,"thresh1",_thresh1,ms_thresh1);
FLEXT_CADDATTR_VAR(c,"thresh2",_thresh2,ms_thresh2);
}
scrape::scrape(I argc,const t_atom *argv):
fftease(4,F_BALANCED|F_BITSHUFFLE),
_thresh1(.0001),_thresh2(.09),
_knee(1000),_cutoff(4000)
{
/* parse and set object's options given */
if(argc >= 1) {
if(CanbeFloat(argv[0]))
_knee = GetAFloat(argv[0]);
else
post("%s - Knee must be a float value - set to %f",thisName(),_knee);
}
if(argc >= 2) {
if(CanbeFloat(argv[1])) {
F c = GetAFloat(argv[1]);
if(c > 0) _cutoff = c;
else
post("%s - Cutoff must be > 0 - set to %f",thisName(),_cutoff);
}
else
post("%s - Cutoff must be a float value - set to %f",thisName(),_cutoff);
}
AddInSignal("Messages and input signal");
AddInSignal("Multiplier signal");
AddOutSignal("Transformed signal");
}
V scrape::Clear()
{
_threshfunc = NULL;
fftease::Clear();
}
V scrape::Delete()
{
fftease::Delete();
if(_threshfunc) delete[] _threshfunc;
}
V scrape::Set()
{
fftease::Set();
_threshfunc = new F[get_N()/2];
UpdThrFun();
}
V scrape::UpdThrFun()
{
const I _N2 = get_N()/2;
const F funda = get_Fund();
F curfreq = funda;
for(I i = 0; i < _N2; i++ ) {
if( curfreq < _knee )
_threshfunc[i] = 0;
else if( curfreq >= _knee && curfreq < _cutoff ) {
const F m = (_knee - curfreq) / (_cutoff - _knee) ;
_threshfunc[i] = (1-m) * _thresh1 + m * _thresh2 ;
} else
_threshfunc[i] = _thresh2;
curfreq += funda ;
}
}
/*! \brief Do the spectral transformation
\remark maxamp is calculated later than in the original FFTease scrape~ object
*/
V scrape::Transform(I _N,S *const *in)
{
const F fmult = *in[0];
const F *thrf = _threshfunc;
I i;
F maxamp = 1.;
for( i = 0; i <= _N; i += 2 )
if(maxamp < _channel1[i])
maxamp = _channel1[i];
for( i = 0; i <= _N; i += 2 )
if(_channel1[i] < *(thrf++) * maxamp)
_channel1[i] *= fmult;
}
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