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/* sIgpAck
* for
* pure-data
* www.weiss-archiv.de */
#include "m_pd.h"
#include <math.h>
#ifdef _MSC_VER
#pragma warning( disable : 4244 )
#pragma warning( disable : 4305 )
#endif
/* ------------------------ freqdiv~ ----------------------------- */
/* frequency divider */
/* code from swh_plugins by steve harris www.plugins.org.uk */
static t_class *freqdiv_tilde_class;
typedef struct _freqdiv_tilde
{
t_object x_obj;
t_sample x_denominate;
t_sample x_amp;
float x_count;
t_sample x_lamp;
t_sample x_last;
t_sample x_out;
int x_zeroxs;
float x_f;
} t_freqdiv_tilde;
static void *freqdiv_tilde_new(t_floatarg denominate)
{
t_freqdiv_tilde *x = (t_freqdiv_tilde *)pd_new(freqdiv_tilde_class);
x->x_denominate = denominate;
outlet_new(&x->x_obj, gensym("signal"));
floatinlet_new(&x->x_obj, &x->x_denominate);
x->x_f = 0;
x->x_amp = 0;
x->x_count = 0;
x->x_lamp = 0;
x->x_last = 0;
x->x_out = 0;
x->x_zeroxs = 0;
if (denominate) x->x_denominate = denominate;
else x->x_denominate = 1;
return (x);
}
static t_int *freqdiv_tilde_perform(t_int *w)
{
t_freqdiv_tilde *x = (t_freqdiv_tilde *)(w[1]);
t_float *in = (t_float *)(w[2]);
t_float *out = (t_float *)(w[3]);
int n = (int)(w[4]);
float f;
int den = (int)x->x_denominate;
while (n--)
{
f = *in++;
x->x_count += 1.0f;
if ((f > 0.0f && x->x_last <= 0.0f) || (f < 0.0f && x->x_last >= 0.0))
{
x->x_zeroxs++;
if (den == 1)
{
x->x_out = x->x_out > 0.0f ? -1.0f : 1.0f;
x->x_lamp = x->x_amp / x->x_count;
x->x_zeroxs = 0;
x->x_count = 0;
x->x_amp = 0;
}
}
x->x_amp += fabs(f);
if (den > 1 && (x->x_zeroxs % den) == den-1)
{
x->x_out = x->x_out > 0.0f ? -1.0f : 1.0f;
x->x_lamp = x->x_amp / x->x_count;
x->x_zeroxs = 0;
x->x_count = 0;
x->x_amp = 0;
}
x->x_last = f;
*out++ = x->x_out * x->x_lamp;
}
return (w+5);
}
static void freqdiv_tilde_dsp(t_freqdiv_tilde *x, t_signal **sp)
{
dsp_add(freqdiv_tilde_perform, 4, x, sp[0]->s_vec, sp[1]->s_vec, sp[0]->s_n);
}
void freqdiv_tilde_setup(void)
{
freqdiv_tilde_class = class_new(gensym("freqdiv~"), (t_newmethod)freqdiv_tilde_new, 0,
sizeof(t_freqdiv_tilde), 0, A_DEFFLOAT, 0);
CLASS_MAINSIGNALIN(freqdiv_tilde_class, t_freqdiv_tilde, x_f);
class_addmethod(freqdiv_tilde_class, (t_method)freqdiv_tilde_dsp, gensym("dsp"), 0);
}
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