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#include "m_pd.h"
#include "d_delay.c"
/* ----------------------------- vdc~ ----------------------------- */
static t_class *sigvdc_class;
typedef struct _sigvdc
{
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 */
t_float x_f;
} t_sigvdc;
static void *sigvdc_new(t_symbol *s)
{
t_sigvdc *x = (t_sigvdc *)pd_new(sigvdc_class);
if (!*s->s_name) s = gensym("vdc~");
x->x_sym = s;
x->x_sr = 1;
x->x_zerodel = 0;
outlet_new(&x->x_obj, &s_signal);
x->x_f = 0;
return (x);
}
static t_int *sigvdc_perform(t_int *w)
{
t_sample *in = (t_sample *)(w[1]);
t_sample *out = (t_sample *)(w[2]);
t_delwritectl *ctl = (t_delwritectl *)(w[3]);
t_sigvdc *x = (t_sigvdc *)(w[4]);
int n = (int)(w[5]);
int nsamps = ctl->c_n;
t_sample limit = nsamps - n - 1;
t_sample fn = n-1;
t_sample *vp = ctl->c_vec, *bp, *wp = vp + ctl->c_phase;
t_sample zerodel = x->x_zerodel;
while (n--)
{
t_sample delsamps = x->x_sr * *in++ - zerodel, frac;
int idelsamps;
t_sample 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 - (t_sample)idelsamps;
bp = wp - idelsamps;
if (bp < vp + 4) bp += nsamps;
d = bp[-3];
c = bp[-2];
b = bp[-1];
a = bp[0];
cminusb = c-b;
*out++ = b + frac * (
cminusb - 0.1666667f * (1.-frac) * (
(d - a - 3.0f * cminusb) * frac + (d + 2.0f*a - 3.0f*b)
)
);
}
return (w+6);
}
static void sigvdc_dsp(t_sigvdc *x, t_signal **sp)
{
t_sigdelwrite *delwriter =
(t_sigdelwrite *)pd_findbyclass(x->x_sym, sigdelwrite_class);
x->x_sr = sp[0]->s_sr * 0.001;
if (delwriter)
{
sigdelwrite_checkvecsize(delwriter, sp[0]->s_n);
x->x_zerodel = (delwriter->x_sortno == ugen_getsortno() ?
0 : delwriter->x_vecsize);
dsp_add(sigvdc_perform, 5,
sp[0]->s_vec, sp[1]->s_vec,
&delwriter->x_cspace, x, sp[0]->s_n);
}
else error("vdc~: %s: no such delwrite~",x->x_sym->s_name);
}
void vdc_tilde_setup(void)
{
sigvdc_class = class_new(gensym("vdc~"), (t_newmethod)sigvdc_new, 0,
sizeof(t_sigvdc), 0, A_DEFSYM, 0);
class_addmethod(sigvdc_class, (t_method)sigvdc_dsp, gensym("dsp"), 0);
CLASS_MAINSIGNALIN(sigvdc_class, t_sigvdc, x_f);
}
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