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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"
class cross:
public fftease
{
FLEXT_HEADER(cross,fftease)
public:
cross(I argc,const t_atom *argv);
protected:
virtual V Transform(I _N2,S *const *in);
};
FLEXT_LIB_DSP_V("fftease, cross~",cross)
cross::cross(I argc,const t_atom *argv):
fftease(2,F_STEREO|F_WINDOW|F_BITSHUFFLE)
{
AddInSignal("Messages and driver signal");
AddInSignal("Filter signal");
AddInSignal("Threshold signal for cross synthesis");
AddOutSignal("Transformed signal");
}
V cross::Transform(I _N2,S *const *in)
{
// TG: filled only once per signal vector!!
const F threshie = *in[0];
for (I i = 0; i <= _N2; i++ ) {
const I even = i*2,odd = even+1;
F a = ( i == _N2 ? _buffer1[1] : _buffer2[even] );
F b = ( i == 0 || i == _N2 ? 0. : _buffer2[odd] );
F amp1 = hypot( a, b ) ;
a = ( i == _N2 ? _buffer1[1] : _buffer1[even] );
b = ( i == 0 || i == _N2 ? 0. : _buffer1[odd] );
F amp2 = hypot( a, b );
F phase2 = -atan2( b, a );
// modulate amp2 with amp1 (if over threshold)
if( amp1 > threshie ) amp2 *= amp1;
_buffer1[even] = amp2 * cos( phase2 );
if ( i != _N2 ) _buffer1[odd] = -amp2 * sin( phase2 );
}
}
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