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#include "../src/m_pd.h"
#include "../src/m_fixed.h"
typedef struct lopctl
{
t_sample c_x;
t_sample c_coef;
} t_lopctl;
typedef struct siglop
{
t_object x_obj;
float x_sr;
float x_hz;
t_lopctl x_cspace;
t_lopctl *x_ctl;
float x_f;
} t_siglop;
t_class *siglop_class;
static void siglop_ft1(t_siglop *x, t_floatarg f);
static void *siglop_new(t_floatarg f)
{
t_siglop *x = (t_siglop *)pd_new(siglop_class);
inlet_new(&x->x_obj, &x->x_obj.ob_pd, gensym("float"), gensym("ft1"));
outlet_new(&x->x_obj, gensym("signal"));
x->x_sr = 44100;
x->x_ctl = &x->x_cspace;
x->x_cspace.c_x = 0;
siglop_ft1(x, f);
x->x_f = 0;
return (x);
}
static void siglop_ft1(t_siglop *x, t_floatarg f)
{
t_float coeff;
if (f < 0.001) f = 10;
x->x_hz = f;
coeff = f * (2 * 3.14159) / x->x_sr;
if (coeff > 1) coeff = 1;
x->x_ctl->c_coef = ftofix(coeff);
}
static void siglop_clear(t_siglop *x, t_floatarg q)
{
#ifdef ROCKBOX
(void) q;
#endif
x->x_cspace.c_x = 0;
}
static t_int *siglop_perform(t_int *w)
{
t_sample *in = (t_sample *)(w[1]);
t_sample *out = (t_sample *)(w[2]);
t_lopctl *c = (t_lopctl *)(w[3]);
int n = (t_int)(w[4]);
int i;
t_sample last = c->c_x;
t_sample coef = c->c_coef;
t_sample feedback = ftofix(1) - coef;
for (i = 0; i < n; i++)
last = *out++ = mult(coef, *in++) + mult(feedback,last);
if (PD_BADFLOAT(last))
last = 0;
c->c_x = last;
return (w+5);
}
static void siglop_dsp(t_siglop *x, t_signal **sp)
{
x->x_sr = sp[0]->s_sr;
siglop_ft1(x, x->x_hz);
dsp_add(siglop_perform, 4,
sp[0]->s_vec, sp[1]->s_vec,
x->x_ctl, sp[0]->s_n);
}
void lop_tilde_setup(void)
{
siglop_class = class_new(gensym("lop~"), (t_newmethod)siglop_new, 0,
sizeof(t_siglop), 0, A_DEFFLOAT, 0);
CLASS_MAINSIGNALIN(siglop_class, t_siglop, x_f);
class_addmethod(siglop_class, (t_method)siglop_dsp, gensym("dsp"), 0);
class_addmethod(siglop_class, (t_method)siglop_ft1,
gensym("ft1"), A_FLOAT, 0);
class_addmethod(siglop_class, (t_method)siglop_clear, gensym("clear"), 0);
}
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