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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. */
/* */
/* */
/* tbfft2~ transforms the fft spectrum. it reverses the order of the samples in */
/* the fft spectrum. see the help file for further instruction... */
/* */
/* */
/* tbfft2~ 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: Naked City: Heretic, Jeux Des Dames Cruelles */
/* Bob Ostertag: Attention Span */
/* */
/* */
#include <flext.h>
#if !defined(FLEXT_VERSION) || (FLEXT_VERSION < 401)
#error upgrade your flext version!!!!!!
#endif
class tbfft2: public flext_dsp
{
FLEXT_HEADER(tbfft2,flext_dsp);
public: // constructor
tbfft2();
~tbfft2();
protected:
virtual void m_signal (int n, float *const *in, float *const *out);
virtual void m_dsp (int n, float *const *in, float *const *out);
void set_freq(t_float);
void set_width(t_float);
private:
FLEXT_CALLBACK_1(set_freq,t_float);
FLEXT_CALLBACK_1(set_width,t_float);
t_int center;
t_int width;
t_float * tmp;
t_int n0;
};
FLEXT_LIB_DSP("tbfft2~",tbfft2)
tbfft2::tbfft2()
{
AddInSignal();
AddOutSignal();
FLEXT_ADDMETHOD_F(0,"center",set_freq);
FLEXT_ADDMETHOD_F(0,"width",set_width);
}
tbfft2::~tbfft2()
{
free(tmp);
}
void tbfft2::m_dsp(int n, t_float *const *in, t_float *const *out)
{
free(tmp);
tmp=(t_float*)malloc(n*sizeof(t_float));
}
void tbfft2::m_signal(int n, t_float *const *in, t_float *const *out)
{
t_float * ins = in[0];
t_float * outs = out[0];
CopySamples(tmp,ins,n);
n0=n/2;
if (center-width>0)
{
n=center-width;
}
else
n=0;
while (n<center+width)
{
tmp[n]=*(ins+2*center-n);
++n;
}
//memcpy
CopySamples(outs,tmp,n0*2);
}
void tbfft2::set_freq(t_float freq)
{
center=freq;
set_width(width);
}
void tbfft2::set_width(t_float w)
{
if (w+center>n0)
{
width=n0-center;
return;
}
if (center-w<0)
{
width=center;
return;
}
width=w;
}
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