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/*
Copyright (C) 2004 Antoine Rousseau
all material Copyright (c) 1997-1999 Miller Puckette.
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
/* a "sweet" saw generator, as described in pddoc/3.audio/K05.bandlimited .*/
#include "m_pd.h"
#include "math.h"
#include <stdlib.h>
#define UNITBIT32 1572864. /* 3*2^19; bit 32 has place value 1 */
#if defined(__FreeBSD__) || defined(__APPLE__) || defined(__FreeBSD_kernel__) \
|| defined(__OpenBSD__)
#include <machine/endian.h>
#endif
#if defined(__linux__) || defined(__CYGWIN__) || defined(__GNU__) || \
defined(ANDROID)
#include <endian.h>
#endif
#ifdef __MINGW32__
#include <sys/param.h>
#endif
#ifdef _MSC_VER
/* _MSVC lacks BYTE_ORDER and LITTLE_ENDIAN */
#define LITTLE_ENDIAN 0x0001
#define BYTE_ORDER LITTLE_ENDIAN
#endif
#if !defined(BYTE_ORDER) || !defined(LITTLE_ENDIAN)
#error No byte order defined
#endif
#if BYTE_ORDER == LITTLE_ENDIAN
# define HIOFFSET 1
# define LOWOFFSET 0
#else
# define HIOFFSET 0 /* word offset to find MSB */
# define LOWOFFSET 1 /* word offset to find LSB */
#endif
union tabfudge
{
double tf_d;
int32_t tf_i[2];
};
/* -------------------------- ssaw~ ------------------------------ */
static t_class *ssaw_class, *scalarssaw_class;
static t_sample ssaw_array[1002];
#define SAW_ARRAY_LEN 1002
typedef struct _ssaw
{
t_object x_obj;
//from phasor~:
double x_phase;
t_float x_conv;
t_float x_f; /* scalar frequency */
t_float x_band; /* band limit (Hertz)*/
} t_ssaw;
static void *ssaw_new(t_floatarg f)
{
t_ssaw *x = (t_ssaw *)pd_new(ssaw_class);
x->x_f = f;
inlet_new(&x->x_obj, &x->x_obj.ob_pd, &s_float, gensym("ft1"));
x->x_phase = 0;
x->x_conv = 0;
x->x_band = 22000;
outlet_new(&x->x_obj, gensym("signal"));
return (x);
}
static t_int *ssaw_perform(t_int *w)
{
t_ssaw *x = (t_ssaw *)(w[1]);
t_float *in = (t_float *)(w[2]);
t_float *out = (t_float *)(w[3]);
int i,n = (int)(w[4]);
double dphase = x->x_phase + UNITBIT32;
union tabfudge tf;
int normhipart;
t_sample conv = x->x_conv;
t_sample band=x->x_band*.33;
t_sample *buf = ssaw_array;
tf.tf_d = UNITBIT32;
normhipart = tf.tf_i[HIOFFSET];
tf.tf_d = dphase;
for (i = 0; i < n; i++)
//while (n--)
{
t_sample phase,band2,findex /*= *in++*/;
int index /*= findex*/;
t_sample frac, a, b, c, d, cminusb, *fp;
tf.tf_i[HIOFFSET] = normhipart;
band2=abs(*in);
if(band2>999999) band2=999999;
else if(band2<1) band2=1;
band2=band/band2;
dphase += *in++ * conv;
/**out++*/
phase = (tf.tf_d - UNITBIT32)-0.5;
tf.tf_d = dphase;
findex=phase*band2;
if(findex>0.5) findex=0.5;
else if(findex<-0.5) findex=-0.5;
/*findex=findex*1000+501;
index=findex;*/
/*if (index < 1)
index = 1, frac = 0;
else if (index > maxindex)
index = maxindex, frac = 1;
else*/
frac = findex - index;
/*fp = buf + index;
a = fp[-1];
b = fp[0];
c = fp[1];
d = fp[2];
cminusb = c-b;
*out++ = 0.5+ phase - (
b + frac * ( cminusb - 0.1666667f * (1.-frac) * (
(d - a - 3.0f * cminusb) * frac + (d + 2.0f*a - 3.0f*b)))
);*/
*out++ = 0.5+ phase - buf[(int)(findex*1000+501)];
}
tf.tf_i[HIOFFSET] = normhipart;
x->x_phase = tf.tf_d - UNITBIT32;
return (w+5);
}
static void ssaw_dsp(t_ssaw *x, t_signal **sp)
{
x->x_conv = 1./sp[0]->s_sr;
dsp_add(ssaw_perform, 4, x, sp[0]->s_vec, sp[1]->s_vec, sp[0]->s_n);
}
static void ssaw_ft1(t_ssaw *x, t_float f)
{
x->x_phase = f;
}
static void ssaw_initarray(void)
{
int i;
t_sample j;
for(i=0; i<1002; i++)
{
j=(i-1)*M_PI/1000.0; //period 2000 sample, 1 sample back phase
ssaw_array[i]= 0.57692*
(-1*cos(j) + 0.333333*cos(j*3.0) -0.2* cos(j*5.0));
}
}
void ssaw_tilde_setup(void)
{
ssaw_class = class_new(gensym("ssaw~"), (t_newmethod)ssaw_new, 0,
sizeof(t_ssaw), 0, A_DEFFLOAT, 0);
CLASS_MAINSIGNALIN(ssaw_class, t_ssaw, x_f);
class_addmethod(ssaw_class, (t_method)ssaw_dsp, gensym("dsp"), 0);
class_addmethod(ssaw_class, (t_method)ssaw_ft1,
gensym("ft1"), A_FLOAT, 0);
ssaw_initarray();
}
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