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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 "m_pd.h"
#include "sickle/sic.h"
typedef struct _sah
{
t_sic x_sic;
t_float x_threshold;
t_float x_lastin;
t_float x_lastout;
} t_sah;
static t_class *sah_class;
static t_int *sah_perform(t_int *w)
{
t_sah *x = (t_sah *)(w[1]);
int nblock = (t_int)(w[2]);
t_float *in1 = (t_float *)(w[3]);
t_float *in2 = (t_float *)(w[4]);
t_float *out = (t_float *)(w[5]);
t_float threshold = x->x_threshold;
t_float lastin = x->x_lastin;
t_float lastout = x->x_lastout;
while (nblock--)
{
float f = *in2++;
if (lastin <= threshold && f > threshold) /* CHECKME <=, > */
lastout = *in1;
in1++;
lastin = f;
*out++ = lastout;
}
x->x_lastin = lastin;
x->x_lastout = lastout;
return (w + 6);
}
static void sah_dsp(t_sah *x, t_signal **sp)
{
dsp_add(sah_perform, 5, x, sp[0]->s_n,
sp[0]->s_vec, sp[1]->s_vec, sp[2]->s_vec);
}
static void sah_float(t_sah *x, t_float f)
{
x->x_threshold = f;
}
static void *sah_new(t_floatarg f)
{
t_sah *x = (t_sah *)pd_new(sah_class);
x->x_threshold = f;
x->x_lastin = 0;
x->x_lastout = 0;
inlet_new((t_object *)x, (t_pd *)x, &s_signal, &s_signal);
outlet_new((t_object *)x, &s_signal);
return (x);
}
void sah_tilde_setup(void)
{
sah_class = class_new(gensym("sah~"),
(t_newmethod)sah_new, 0,
sizeof(t_sah), 0, A_DEFFLOAT, 0);
sic_setup(sah_class, sah_dsp, sah_float);
}
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