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/* Copyright (c) 2003 Tim Blechmann. */
/* For information on usage and redistribution, and for a DISCLAIMER OF ALL */
/* WARRANTIES, see the file, "COPYING" in this distribution. */
/* */
/* */
/* tbfft1~ transforms the fft spectrum */
/* */
/* tbfft1~ uses the flext C++ layer for Max/MSP and PD externals. */
/* get it at http://www.parasitaere-kapazitaeten.de/PD/ext */
/* thanks to Thomas Grill */
/* */
/* */
/* */
/* This program is free software; you can redistribute it and/or */
/* modify it under the terms of the GNU General Public License */
/* as published by the Free Software Foundation; either version 2 */
/* of the License, or (at your option) any later version. */
/* */
/* See file LICENSE for further informations on licensing terms. */
/* */
/* This program is distributed in the hope that it will be useful, */
/* but WITHOUT ANY WARRANTY; without even the implied warranty of */
/* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the */
/* GNU General Public License for more details. */
/* */
/* You should have received a copy of the GNU General Public License */
/* along with this program; if not, write to the Free Software */
/* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
/* */
/* Based on PureData by Miller Puckette and others. */
/* */
/* */
/* */
/* coded while listening to: John Zorn / Mike Patton / Ikue Mori: Hemophiliac */
/* Rashied Ali / Frank Lowe: Duo Exchange */
/* Keith Rowe / John Tilbury: Duos For Doris */
/* */
#include <flext.h>
#if !defined(FLEXT_VERSION) || (FLEXT_VERSION < 401)
#error upgrade your flext version!!!!!!
#endif
class tbfft1: public flext_dsp
{
FLEXT_HEADER(tbfft1,flext_dsp);
public: // constructor
tbfft1();
protected:
virtual void m_signal (int n, float *const *in, float *const *out);
void set_freq(t_float);
void set_fact(t_float);
private:
FLEXT_CALLBACK_1(set_freq,t_float)
FLEXT_CALLBACK_1(set_fact,t_float)
t_int center;
t_float factor;
t_float pos;
t_int posi;
float *ins;
float *outs;
t_float s;
t_float b;
};
FLEXT_LIB_DSP("tbfft1~",tbfft1)
tbfft1::tbfft1()
{
AddInSignal();
AddOutSignal();
FLEXT_ADDMETHOD_F(0,"center",set_freq);
FLEXT_ADDMETHOD_F(0,"factor",set_fact);
}
void tbfft1::m_signal(int n, t_float *const *in, t_float *const *out)
{
ins = in[0];
outs = out[0];
n=n/2+1;
while(n!=0)
{
pos= n + factor * (center-n);
posi=t_int(pos);
if (n < t_int(center))
{
*(outs+n) = ((pos-t_float(posi)) * (*(ins+posi)))/2
+((1-pos+t_float(posi)) * (*(ins+posi+1)))/2;
}
else
{
*(outs+n) = ((pos-t_float(posi)) * (*(ins+posi-1)))/2
+((1-pos+t_float(posi)) * (*(ins+posi)))/2;
}
--n;
}
}
void tbfft1::set_freq(t_float freq)
{
s=Samplerate();
b=Blocksize();
center=freq/(s/b);
}
void tbfft1::set_fact(t_float f)
{
if (f<2)
factor=f;
}
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