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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 ether:
public fftease
{
FLEXT_HEADER_S(ether,fftease,setup)
public:
ether(I argc,const t_atom *argv);
protected:
virtual V Transform(I n,S *const *in);
BL _qual,_invert;
F _threshMult;
private:
static V setup(t_classid c);
FLEXT_ATTRVAR_B(_invert)
FLEXT_ATTRVAR_F(_threshMult)
};
FLEXT_LIB_DSP_V("fftease, ether~",ether)
V ether::setup(t_classid c)
{
FLEXT_CADDATTR_VAR1(c,"invert",_invert);
FLEXT_CADDATTR_VAR1(c,"index",_threshMult);
}
ether::ether(I argc,const t_atom *argv):
fftease(2,F_STEREO|F_BITSHUFFLE),
_qual(false),_threshMult(0),_invert(false)
{
/* parse and set object's options given */
if(argc >= 1) {
if(CanbeBool(argv[0]))
_qual = GetABool(argv[0]);
else
post("%s - Quality must be a boolean value - set to %0i",thisName(),_qual?1:0);
}
_mult = _qual?4:2;
if(_qual) _flags |= F_WINDOW;
AddInSignal("Messages and input signal");
AddInSignal("Reference signal");
AddOutSignal("Transformed signal");
}
V ether::Transform(I _N2,S *const *in)
{
F threshMult = _threshMult;
if (threshMult == 0. ) threshMult = 1;
for (I i = 0; i <= _N2; i++ ) {
const I even = i*2,odd = even + 1;
// convert to polar coordinates from complex values
register F a,b;
a = ( i == _N2 ? _buffer1[1] : _buffer1[even] );
b = ( i == 0 || i == _N2 ? 0. : _buffer1[odd] );
F amp1 = hypot( a, b );
F phase1 = -atan2( b, a );
a = ( i == _N2 ? _buffer2[1] : _buffer2[even] );
b = ( i == 0 || i == _N2 ? 0. : _buffer2[odd] );
F amp2 = hypot( a, b );
F phase2 = -atan2( b, a );
// use simple threshold for inverse compositing
if(_invert?(amp1 > amp2*threshMult):(amp1 < amp2*threshMult) ) amp1 = amp2;
if (phase1 == 0. ) phase1 = phase2;
// convert back to complex form, read for the inverse fft
_buffer1[even] = amp1 * cos(phase1);
if(i != _N2) _buffer1[odd] = -amp1 * sin(phase1);
}
}
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