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/* --------------------- threshold ----------------------------- */
#include "defines.h"
static t_class *threshold_class;
typedef struct _threshold
{
t_object x_obj;
t_outlet *x_outlet1; /* bang out for high thresh */
t_outlet *x_outlet2; /* bang out for low thresh */
t_clock *x_clock; /* wakeup for message output */
int x_state; /* 1 = high, 0 = low */
float x_hithresh; /* value of high threshold */
float x_lothresh; /* value of low threshold */
float x_deadwait; /* msec remaining in dead period */
float x_hideadtime; /* hi dead */
float x_lodeadtime; /* lo dead */
} t_threshold;
static void threshold_tick(t_threshold *x);
static void threshold_set(t_threshold *x,
t_floatarg hithresh, t_floatarg hideadtime,
t_floatarg lothresh, t_floatarg lodeadtime);
static t_threshold *threshold_new(t_floatarg hithresh,
t_floatarg hideadtime, t_floatarg lothresh, t_floatarg lodeadtime)
{
t_threshold *x = (t_threshold *)
pd_new(threshold_class);
x->x_state = 0; /* low state */
x->x_deadwait = 0; /* no dead time */
x->x_clock = clock_new(x, (t_method)threshold_tick);
x->x_outlet1 = outlet_new(&x->x_obj, gensym("bang"));
x->x_outlet2 = outlet_new(&x->x_obj, gensym("bang"));
threshold_set(x, hithresh, hideadtime, lothresh, lodeadtime);
return (x);
}
/* "set" message to specify thresholds and dead times */
static void threshold_set(t_threshold *x,
t_floatarg hithresh, t_floatarg hideadtime,
t_floatarg lothresh, t_floatarg lodeadtime)
{
if (lothresh > hithresh)
lothresh = hithresh;
x->x_hithresh = hithresh;
x->x_hideadtime = hideadtime;
x->x_lothresh = lothresh;
x->x_lodeadtime = lodeadtime;
}
/* number in inlet sets state -- note incompatible with JMAX which used
"int" message for this, impossible here because of auto signal conversion */
static void threshold_ft1(t_threshold *x, t_floatarg f)
{
x->x_state = (f != 0);
x->x_deadwait = 0;
}
static void threshold_tick(t_threshold *x)
{
if (x->x_state)
outlet_bang(x->x_outlet1);
else outlet_bang(x->x_outlet2);
}
static void threshold_perform(t_threshold *x, t_float in)
{
if (x->x_deadwait > 0)
x->x_deadwait -= 1;
else if (x->x_state)
{
/* we're high; look for low sample */
if (in < x->x_lothresh)
{
clock_delay(x->x_clock, 0L);
x->x_state = 0;
x->x_deadwait = x->x_lodeadtime;
}
}
else
{
/* we're low; look for high sample */
if (in >= x->x_hithresh)
{
clock_delay(x->x_clock, 0L);
x->x_state = 1;
x->x_deadwait = x->x_hideadtime;
}
}
}
static void threshold_ff(t_threshold *x)
{
clock_free(x->x_clock);
}
void threshold_setup( void)
{
threshold_class = class_new(gensym("threshold"),
(t_newmethod)threshold_new, (t_method)threshold_ff,
sizeof(t_threshold), 0,
A_DEFFLOAT, A_DEFFLOAT, A_DEFFLOAT, A_DEFFLOAT, 0);
class_addfloat(threshold_class, (t_method)threshold_perform);
class_addmethod(threshold_class, (t_method)threshold_set,
gensym("set"), A_FLOAT, A_FLOAT, A_FLOAT, A_FLOAT, 0);
class_addmethod(threshold_class, (t_method)threshold_ft1,
gensym("ft1"), A_FLOAT, 0);
}
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