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/* Copyright (c) 2002-2003 krzYszcz and others.
* For information on usage and redistribution, and for a DISCLAIMER OF ALL
* WARRANTIES, see the file, "LICENSE.txt," in this distribution. */
#include <string.h>
#include "m_pd.h"
#include "sickle/sic.h"
typedef struct _allpass
{
t_sic x_sic;
float x_sr;
float x_ksr;
t_float *x_buf;
int x_bufsize; /* as allocated */
int x_maxsize; /* as used */
float x_maxdelay; /* same in ms */
int x_phase; /* writing head */
} t_allpass;
static t_class *allpass_class;
/* maximum delay defaults to 50 ms (cycling has 10 ms here) */
#define ALLPASS_DEFMAXDELAY 50.0
/* LATER choose the best way (compare with comb~) */
#define ALLPASS_MAXFEEDBACK 0.999
static void allpass_clear(t_allpass *x)
{
memset(x->x_buf, 0, x->x_maxsize * sizeof(*x->x_buf));
x->x_phase = 0;
}
static void allpass_resize(t_allpass *x, int newsize)
{
if (newsize > 0 && newsize != x->x_maxsize)
{
if (newsize > x->x_bufsize)
{
x->x_buf = resizebytes(x->x_buf,
x->x_bufsize * sizeof(*x->x_buf),
newsize * sizeof(*x->x_buf));
/* LATER test for failure */
x->x_bufsize = newsize;
}
x->x_maxsize = newsize;
}
allpass_clear(x);
}
static t_int *allpass_perform(t_int *w)
{
t_allpass *x = (t_allpass *)(w[1]);
int nblock = (int)(w[2]);
t_float *xin = (t_float *)(w[3]);
t_float *din = (t_float *)(w[4]);
t_float *gin = (t_float *)(w[5]);
t_float *out = (t_float *)(w[6]);
t_float *buf = x->x_buf;
int maxsize = x->x_maxsize;
int guardpoint = maxsize - 1;
float ksr = x->x_ksr;
int wph = x->x_phase;
while (nblock--)
{ /* TDFII scheme */
float xn = *xin++;
float delsize = ksr * *din++;
float gain = *gin++;
float yn;
float rph; /* reading head */
if (gain < -ALLPASS_MAXFEEDBACK) gain = -ALLPASS_MAXFEEDBACK;
else if (gain > ALLPASS_MAXFEEDBACK) gain = ALLPASS_MAXFEEDBACK;
yn = -gain * xn;
if (delsize > 0)
{
int ndx;
float val;
rph = wph - (delsize > guardpoint ? guardpoint : delsize);
if (rph < 0) rph += guardpoint;
ndx = (int)rph;
val = buf[ndx];
/* ``a cheezy linear interpolation'' ala msp,
(vd~ uses 4-point interpolation...) */
yn += val + (buf[ndx+1] - val) * (rph - ndx);
}
*out++ = yn;
if (wph == guardpoint)
{
buf[wph] = *buf = xn + gain * yn;
wph = 1;
}
else buf[wph++] = xn + gain * yn;
}
x->x_phase = wph;
return (w + 7);
}
static void allpass_dsp(t_allpass *x, t_signal **sp)
{
float sr = sp[0]->s_sr;
if (sr != x->x_sr)
{
x->x_sr = sr;
x->x_ksr = sr * 0.001;
allpass_resize(x, x->x_ksr * x->x_maxdelay);
}
else allpass_clear(x);
dsp_add(allpass_perform, 6, x, sp[0]->s_n,
sp[0]->s_vec, sp[1]->s_vec, sp[2]->s_vec, sp[3]->s_vec);
}
static void *allpass_new(t_floatarg f1, t_floatarg f2, t_floatarg f3)
{
t_allpass *x;
float maxdelay = (f1 > 0 ? f1 : ALLPASS_DEFMAXDELAY);
float sr = sys_getsr();
float ksr = sr * 0.001;
int bufsize = ksr * maxdelay;
t_float *buf = (t_float *)getbytes(bufsize * sizeof(*buf));
if (!buf)
return (0);
x = (t_allpass *)pd_new(allpass_class);
x->x_maxdelay = maxdelay;
x->x_sr = sr;
x->x_ksr = ksr;
x->x_bufsize = x->x_maxsize = bufsize;
x->x_buf = buf;
if (f2 < 0) f2 = 0;
if (f3 < -ALLPASS_MAXFEEDBACK) f3 = -ALLPASS_MAXFEEDBACK;
else if (f3 > ALLPASS_MAXFEEDBACK) f3 = ALLPASS_MAXFEEDBACK;
sic_newinlet((t_sic *)x, f2);
sic_newinlet((t_sic *)x, f3);
outlet_new((t_object *)x, &s_signal);
allpass_clear(x);
return (x);
}
static void allpass_free(t_allpass *x)
{
if (x->x_buf) freebytes(x->x_buf, x->x_bufsize * sizeof(*x->x_buf));
}
void allpass_tilde_setup(void)
{
allpass_class = class_new(gensym("allpass~"),
(t_newmethod)allpass_new,
(t_method)allpass_free,
sizeof(t_allpass), 0,
A_DEFFLOAT, A_DEFFLOAT, A_DEFFLOAT, 0);
sic_setup(allpass_class, allpass_dsp, SIC_FLOATTOSIGNAL);
class_addmethod(allpass_class, (t_method)allpass_clear, gensym("clear"), 0);
}
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