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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>
// add quality switch
class swinger:
public fftease
{
FLEXT_HEADER(swinger,fftease)
public:
swinger();
protected:
virtual V Transform(I n,S *const *in);
};
FLEXT_LIB_DSP("fftease, swinger~",swinger)
swinger::swinger():
fftease(2,F_STEREO|F_BITSHUFFLE)
{
AddInSignal("Messages and input signal");
AddInSignal("Signal to supply phase information");
AddOutSignal("Transformed signal");
}
V swinger::Transform(I _N2,S *const *in)
{
for (I i = 0; i <= _N2; i++ ) {
const I even = i*2,odd = even+1;
// convert to polar coordinates from complex values
// replace signal one's phases with those of signal two
const F a1 = ( i == _N2 ? _buffer1[1] : _buffer1[even] );
const F b1 = ( i == 0 || i == _N2 ? 0. : _buffer1[odd] );
// amplitude only
const F amp = hypot( a1, b1 );
const F a2 = ( i == _N2 ? _buffer2[1] : _buffer2[even] );
const F b2 = ( i == 0 || i == _N2 ? 0. : _buffer2[odd] );
// phase only
const F ph = -atan2( b2, a2 );
_buffer1[even] = amp * cos( ph );
if ( i != _N2 )
_buffer1[odd] = -amp * sin( ph );
}
}
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