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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. */
/* tab16write~, tab16play~, tab16read~, tab16read4~, tab16send~, tab16receive~ */
#include "iem16_table.h"
/******************** tab16read4~ ***********************/
static t_class *tab16read4_tilde_class;
typedef struct _tab16read4_tilde{
t_object x_obj;
int x_npoints;
t_iem16_16bit *x_vec;
t_symbol *x_arrayname;
float x_f;
} t_tab16read4_tilde;
static void *tab16read4_tilde_new(t_symbol *s){
t_tab16read4_tilde *x = (t_tab16read4_tilde *)pd_new(tab16read4_tilde_class);
x->x_arrayname = s;
x->x_vec = 0;
outlet_new(&x->x_obj, gensym("signal"));
x->x_f = 0;
return (x);
}
static t_int *tab16read4_tilde_perform(t_int *w){
t_tab16read4_tilde *x = (t_tab16read4_tilde *)(w[1]);
t_float *in = (t_float *)(w[2]);
t_float *out = (t_float *)(w[3]);
int n = (int)(w[4]);
int maxindex;
t_iem16_16bit *buf = x->x_vec;
t_iem16_16bit *fp;
int i;
maxindex = x->x_npoints - 3;
if (!buf) goto zero;
for (i = 0; i < n; i++) {
float findex = *in++;
int index = findex;
float frac, a, b, c, d, cminusb;
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]*IEM16_SCALE_DOWN;
b = fp[0]*IEM16_SCALE_DOWN;
c = fp[1]*IEM16_SCALE_DOWN;
d = fp[2]*IEM16_SCALE_DOWN;
cminusb = c-b;
*out++ = b + frac * (
cminusb - 0.5f * (frac-1.) * (
(a - d + 3.0f * cminusb) * frac + (b - a - cminusb)
)
);
}
return (w+5);
zero:
while (n--) *out++ = 0;
return (w+5);
}
void tab16read4_tilde_set(t_tab16read4_tilde *x, t_symbol *s){
t_table16 *a;
x->x_arrayname = s;
if (!(a = (t_table16 *)pd_findbyclass(x->x_arrayname, table16_class))) {
if (*s->s_name)
error("tab16read4~: %s: no such array", x->x_arrayname->s_name);
x->x_vec = 0;
}
else if (!table16_getarray16(a, &x->x_npoints, &x->x_vec)) {
error("%s: bad template for tab16read4~", x->x_arrayname->s_name);
x->x_vec = 0;
}
else table16_usedindsp(a);
}
static void tab16read4_tilde_dsp(t_tab16read4_tilde *x, t_signal **sp){
tab16read4_tilde_set(x, x->x_arrayname);
dsp_add(tab16read4_tilde_perform, 4, x,
sp[0]->s_vec, sp[1]->s_vec, sp[0]->s_n);
}
void tab16read4_tilde_setup(void){
tab16read4_tilde_class = class_new(gensym("tab16read4~"),
(t_newmethod)tab16read4_tilde_new, 0,
sizeof(t_tab16read4_tilde), 0, A_DEFSYM, 0);
CLASS_MAINSIGNALIN(tab16read4_tilde_class, t_tab16read4_tilde, x_f);
class_addmethod(tab16read4_tilde_class, (t_method)tab16read4_tilde_dsp,
gensym("dsp"), 0);
class_addmethod(tab16read4_tilde_class, (t_method)tab16read4_tilde_set,
gensym("set"), A_SYMBOL, 0);
}
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