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/* copyleft (c) 2003 forum::für::umläute -- IOhannes m zmölnig @ IEM
* based on d_delay.c from pd:
* Copyright (c) 1997-1999 Miller Puckette.
* For information on usage and redistribution, and for a DISCLAIMER OF ALL
* WARRANTIES, see the file, "LICENSE.txt," in this distribution. */
/* del16read~, del16write~, vd16~ */
#include "iem16_delay.h"
/* ----------------------------- vd~ ----------------------------- */
static t_class *sig16vd_class;
typedef struct _sig16vd{
t_object x_obj;
t_symbol *x_sym;
t_float x_sr; /* samples per msec */
int x_zerodel; /* 0 or vecsize depending on read/write order */
float x_f;
} t_sig16vd;
static void *sig16vd_new(t_symbol *s){
t_sig16vd *x = (t_sig16vd *)pd_new(sig16vd_class);
if (!*s->s_name) s = gensym("vd~");
x->x_sym = s;
x->x_sr = 1;
x->x_zerodel = 0;
outlet_new(&x->x_obj, gensym("signal"));
x->x_f = 0;
return (x);
}
static t_int *sig16vd_perform(t_int *w){
t_float *in = (t_float *)(w[1]);
t_float *out = (t_float *)(w[2]);
t_del16writectl *ctl = (t_del16writectl *)(w[3]);
t_sig16vd *x = (t_sig16vd *)(w[4]);
int n = (int)(w[5]);
int nsamps = ctl->c_n;
float limit = nsamps - n - 1;
float fn = n-4;
t_iem16_16bit *vp = ctl->c_vec, *bp, *wp = vp + ctl->c_phase;
float zerodel = x->x_zerodel;
while (n--) {
float delsamps = x->x_sr * *in++ - zerodel, frac;
int idelsamps;
float a, b, c, d, cminusb;
if (delsamps < 1.00001f) delsamps = 1.00001f;
if (delsamps > limit) delsamps = limit;
delsamps += fn;
fn = fn - 1.0f;
idelsamps = delsamps;
frac = delsamps - (float)idelsamps;
bp = wp - (idelsamps + 3);
if (bp < vp + 4) bp += nsamps;
d = bp[-3]*IEM16_SCALE_DOWN;
c = bp[-2]*IEM16_SCALE_DOWN;
b = bp[-1]*IEM16_SCALE_DOWN;
a = bp[00]*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+6);
}
static void sig16vd_dsp(t_sig16vd *x, t_signal **sp){
t_sigdel16write *delwriter =
(t_sigdel16write *)pd_findbyclass(x->x_sym, sigdel16write_class);
x->x_sr = sp[0]->s_sr * 0.001;
if (delwriter) {
sigdel16write_checkvecsize(delwriter, sp[0]->s_n);
x->x_zerodel = (delwriter->x_sortno == ugen_getsortno() ?
0 : delwriter->x_vecsize);
dsp_add(sig16vd_perform, 5,
sp[0]->s_vec, sp[1]->s_vec,
&delwriter->x_cspace, x, sp[0]->s_n);
}
else error("vd~: %s: no such delwrite~",x->x_sym->s_name);
}
static void sig16vd_setup(void){
sig16vd_class = class_new(gensym("vd16~"), (t_newmethod)sig16vd_new, 0,
sizeof(t_sig16vd), 0, A_DEFSYM, 0);
class_addmethod(sig16vd_class, (t_method)sig16vd_dsp, gensym("dsp"), 0);
CLASS_MAINSIGNALIN(sig16vd_class, t_sig16vd, x_f);
}
// G.Holzmann: for PD-extended build system
void vd16_tilde_setup(void)
{
sig16vd_setup();
}
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