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/* For information on usage and redistribution, and for a DISCLAIMER OF ALL
* WARRANTIES, see the file, "LICENSE.txt," in this distribution.
iemlib1 written by Thomas Musil, Copyright (c) IEM KUG Graz Austria 2000 - 2005 */
#include "m_pd.h"
#include "iemlib.h"
#include <math.h>
/* ------------------------ iem_cot4~ ----------------------------- */
t_float *iem_cot4_tilde_table_cos=(t_float *)0L;
t_float *iem_cot4_tilde_table_sin=(t_float *)0L;
static t_class *iem_cot4_tilde_class;
typedef struct _iem_cot4_tilde
{
t_object x_obj;
t_float x_sr;
t_float x_msi;
} t_iem_cot4_tilde;
static t_int *iem_cot4_tilde_perform(t_int *w)
{
t_float *in = (t_float *)(w[1]);
t_float *out = (t_float *)(w[2]);
t_float norm_freq;
t_float hout;
t_iem_cot4_tilde *x = (t_iem_cot4_tilde *)(w[3]);
t_float sr=x->x_sr;
int n = (int)(w[4]);
t_float *ctab = iem_cot4_tilde_table_cos, *stab = iem_cot4_tilde_table_sin;
t_float *caddr, *saddr, cf1, cf2, sf1, sf2, frac;
double dphase;
int normhipart;
int32 mytfi;
union tabfudge tf;
tf.tf_d = UNITBIT32;
normhipart = tf.tf_i[HIOFFSET];
#if 0 /* this is the readable version of the code. */
while (n--)
{
norm_freq = *in * sr;
if(norm_freq < 0.0001f)
norm_freq = 0.0001f;
else if(norm_freq > 0.9f)
norm_freq = 0.9f;
dphase = (double)(norm_freq * (t_float)(COSTABSIZE)) + UNITBIT32;
tf.tf_d = dphase;
mytfi = tf.tf_i[HIOFFSET] & (COSTABSIZE-1);
saddr = stab + (mytfi);
caddr = ctab + (mytfi);
tf.tf_i[HIOFFSET] = normhipart;
frac = tf.tf_d - UNITBIT32;
sf1 = saddr[0];
sf2 = saddr[1];
cf1 = caddr[0];
cf2 = caddr[1];
in++;
*out++ = (cf1 + frac * (cf2 - cf1))/(sf1 + frac * (sf2 - sf1));
}
#endif
#if 1 /* this is the same, unwrapped by hand. prolog beg*/
n /= 4;
norm_freq = *in * sr;
if(norm_freq < 0.0001f)
norm_freq = 0.0001f;
else if(norm_freq > 0.9f)
norm_freq = 0.9f;
dphase = (double)(norm_freq * (t_float)(COSTABSIZE)) + UNITBIT32;
tf.tf_d = dphase;
mytfi = tf.tf_i[HIOFFSET] & (COSTABSIZE-1);
saddr = stab + (mytfi);
caddr = ctab + (mytfi);
tf.tf_i[HIOFFSET] = normhipart;
in += 4; /*prolog end*/
while (--n)
{
norm_freq = *in * sr;
if(norm_freq < 0.0001f)
norm_freq = 0.0001f;
else if(norm_freq > 0.9f)
norm_freq = 0.9f;
dphase = (double)(norm_freq * (t_float)(COSTABSIZE)) + UNITBIT32;
frac = tf.tf_d - UNITBIT32;
tf.tf_d = dphase;
sf1 = saddr[0];
sf2 = saddr[1];
cf1 = caddr[0];
cf2 = caddr[1];
mytfi = tf.tf_i[HIOFFSET] & (COSTABSIZE-1);
saddr = stab + (mytfi);
caddr = ctab + (mytfi);
hout = (cf1 + frac * (cf2 - cf1))/(sf1 + frac * (sf2 - sf1));
*out++ = hout;
*out++ = hout;
*out++ = hout;
*out++ = hout;
in += 4;
tf.tf_i[HIOFFSET] = normhipart;
}/*epilog beg*/
frac = tf.tf_d - UNITBIT32;
sf1 = saddr[0];
sf2 = saddr[1];
cf1 = caddr[0];
cf2 = caddr[1];
hout = (cf1 + frac * (cf2 - cf1))/(sf1 + frac * (sf2 - sf1));
*out++ = hout;
*out++ = hout;
*out++ = hout;
*out++ = hout;
/*epilog end*/
#endif
return (w+5);
}
static void iem_cot4_tilde_dsp(t_iem_cot4_tilde *x, t_signal **sp)
{
x->x_sr = 2.0f / (t_float)sp[0]->s_sr;
dsp_add(iem_cot4_tilde_perform, 4, sp[0]->s_vec, sp[1]->s_vec, x, sp[0]->s_n);
}
static void iem_cot4_tilde_maketable(void)
{
int i;
t_float *fp, phase, fff, phsinc = 0.5*3.141592653 / ((t_float)COSTABSIZE);
union tabfudge tf;
if(!iem_cot4_tilde_table_sin)
{
iem_cot4_tilde_table_sin = (t_float *)getbytes(sizeof(t_float) * (COSTABSIZE+1));
for(i=COSTABSIZE+1, fp=iem_cot4_tilde_table_sin, phase=0; i--; fp++, phase+=phsinc)
*fp = sin(phase);
}
if(!iem_cot4_tilde_table_cos)
{
iem_cot4_tilde_table_cos = (t_float *)getbytes(sizeof(t_float) * (COSTABSIZE+1));
for(i=COSTABSIZE+1, fp=iem_cot4_tilde_table_cos, phase=0; i--; fp++, phase+=phsinc)
*fp = cos(phase);
}
tf.tf_d = UNITBIT32 + 0.5;
if((unsigned)tf.tf_i[LOWOFFSET] != 0x80000000)
bug("iem_cot4~: unexpected machine alignment");
}
static void *iem_cot4_tilde_new(void)
{
t_iem_cot4_tilde *x = (t_iem_cot4_tilde *)pd_new(iem_cot4_tilde_class);
outlet_new(&x->x_obj, gensym("signal"));
x->x_msi = 0;
return (x);
}
void iem_cot4_tilde_setup(void)
{
iem_cot4_tilde_class = class_new(gensym("iem_cot4~"), (t_newmethod)iem_cot4_tilde_new, 0,
sizeof(t_iem_cot4_tilde), 0, 0);
class_addcreator((t_newmethod)iem_cot4_tilde_new, gensym("iem_cot~"), 0);
CLASS_MAINSIGNALIN(iem_cot4_tilde_class, t_iem_cot4_tilde, x_msi);
class_addmethod(iem_cot4_tilde_class, (t_method)iem_cot4_tilde_dsp, gensym("dsp"), 0);
iem_cot4_tilde_maketable();
class_sethelpsymbol(iem_cot4_tilde_class, gensym("iemhelp/help-iem_cot4~"));
}
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