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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 burrow:
public fftease
{
FLEXT_HEADER_S(burrow,fftease,setup)
public:
burrow(I argc,const t_atom *argv);
protected:
virtual V Transform(I _N2,S *const *in);
BL _invert;
F _threshold,_multiplier;
F _thresh_dB,_mult_dB;
private:
V ms_thresh(F v) { _threshold = (float) (pow( 10., ((_thresh_dB = v) * .05))); }
V ms_mult(F v) { _multiplier = (float) (pow( 10., ((_mult_dB = v) * .05))); }
static V setup(t_classid c);
FLEXT_ATTRGET_F(_thresh_dB)
FLEXT_CALLSET_F(ms_thresh)
FLEXT_ATTRGET_F(_mult_dB)
FLEXT_CALLSET_F(ms_mult)
FLEXT_ATTRVAR_B(_invert)
};
FLEXT_LIB_DSP_V("fftease, burrow~",burrow)
V burrow::setup(t_classid c)
{
FLEXT_CADDATTR_VAR(c,"thresh",_thresh_dB,ms_thresh);
FLEXT_CADDATTR_VAR(c,"mult",_mult_dB,ms_mult);
FLEXT_CADDATTR_VAR1(c,"invert",_invert);
}
burrow::burrow(I argc,const t_atom *argv):
fftease(4,true,true,true),
_thresh_dB(-30),_mult_dB(-18),
_invert(false)
{
/* parse and set object's options given */
if(argc >= 1) {
if(CanbeFloat(argv[0]))
_thresh_dB = GetAFloat(argv[0]);
else
post("%s - Threshold must be a float value - set to %0f",thisName(),_thresh_dB);
}
if(argc >= 2) {
if(CanbeFloat(argv[1]))
_mult_dB = GetAFloat(argv[1]);
else
post("%s - Multiplier must be a float value - set to %0f",thisName(),_mult_dB);
}
if(argc >= 3) {
if(CanbeBool(argv[2]))
_invert = GetABool(argv[2]);
else
post("%s - Invert flag must be a boolean value - set to %i",thisName(),_invert?1:0);
}
ms_thresh(_thresh_dB);
ms_mult(_mult_dB);
AddInSignal("Messages and input signal");
AddInSignal("Reference signal");
AddOutSignal("Transformed signal");
}
V burrow::Transform(I _N2,S *const *in)
{
for (I i = 0; i <= _N2; i++ ) {
const I even = i<<1,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] );
_channel1[even] = hypot( a, b );
_channel1[odd] = -atan2( b, a );
a = ( i == _N2 ? _buffer2[1] : _buffer2[even] );
b = ( i == 0 || i == _N2 ? 0. : _buffer2[odd] );
_channel2[even] = hypot( a, b );
/* use simple threshold from second signal to trigger filtering */
if (_invert?(_channel2[even] < _threshold):(_channel2[even] > _threshold) )
_channel1[even] *= _multiplier;
/* convert back to complex form, read for the inverse fft */
_buffer1[even] = _channel1[even] * cos( _channel1[odd] );
if ( i != _N2 )
_buffer1[odd] = -_channel1[even] * sin( _channel1[odd] );
}
}
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