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/* copyleft (c) 2003 forum::für::umläute -- IOhannes m zmölnig @ IEM
* based on d_array.c from pd:
* Copyright (c) 1997-1999 Miller Puckette and others.
* For information on usage and redistribution, and for a DISCLAIMER OF ALL
* WARRANTIES, see the file, "LICENSE.txt," in this distribution. */
/* tab16read, tab16read4, tab16write */
#include "iem16_table.h"
/* ---------- tab16read4: control, non-interpolating ------------------------ */
static t_class *tab16read4_class;
typedef struct _tab16read4{
t_object x_obj;
t_symbol *x_arrayname;
} t_tab16read4;
static void tab16read4_float(t_tab16read4 *x, t_float f){
t_table16 *a;
int npoints;
t_iem16_16bit *vec;
if (!(a = (t_table16 *)pd_findbyclass(x->x_arrayname, table16_class)))
error("%s: no such array", x->x_arrayname->s_name);
else if (!table16_getarray16(a, &npoints, &vec))
error("%s: bad template for tab16read4", x->x_arrayname->s_name);
else if (npoints < 4)
outlet_float(x->x_obj.ob_outlet, 0);
else if (f <= 1)
outlet_float(x->x_obj.ob_outlet, vec[1]);
else if (f >= npoints - 2)
outlet_float(x->x_obj.ob_outlet, vec[npoints - 2]);
else {
int n = f;
float a, b, c, d, cminusb, frac;
t_iem16_16bit *fp;
if (n >= npoints - 2) n = npoints - 3;
fp = vec + n;
frac = f - n;
a = fp[-1];
b = fp[0];
c = fp[1];
d = fp[2];
cminusb = c-b;
outlet_float(x->x_obj.ob_outlet, b + frac * (
cminusb - 0.5f * (frac-1.) * (
(a - d + 3.0f * cminusb) * frac + (b - a - cminusb))));
}
}
static void tab16read4_set(t_tab16read4 *x, t_symbol *s){
x->x_arrayname = s;
}
static void *tab16read4_new(t_symbol *s){
t_tab16read4 *x = (t_tab16read4 *)pd_new(tab16read4_class);
x->x_arrayname = s;
outlet_new(&x->x_obj, gensym("float"));
return (x);
}
void tab16read4_setup(void){
tab16read4_class = class_new(gensym("tab16read4"), (t_newmethod)tab16read4_new,
0, sizeof(t_tab16read4), 0, A_DEFSYM, 0);
class_addfloat(tab16read4_class, (t_method)tab16read4_float);
class_addmethod(tab16read4_class, (t_method)tab16read4_set, gensym("set"),
A_SYMBOL, 0);
}
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