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#include "../src/m_pd.h"
#include "../src/m_fixed.h"
typedef struct hipctl
{
t_sample c_x;
t_sample c_coef;
} t_hipctl;
typedef struct sighip
{
t_object x_obj;
float x_sr;
float x_hz;
t_hipctl x_cspace;
t_hipctl *x_ctl;
float x_f;
} t_sighip;
t_class *sighip_class;
static void sighip_ft1(t_sighip *x, t_floatarg f);
static void *sighip_new(t_floatarg f)
{
t_sighip *x = (t_sighip *)pd_new(sighip_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;
sighip_ft1(x, f);
x->x_f = 0;
return (x);
}
static void sighip_ft1(t_sighip *x, t_floatarg f)
{
t_float coeff;
if (f < 0.001) f = 10;
x->x_hz = f;
coeff = 1 - f * (2 * 3.14159) / x->x_sr;
if (coeff < 0) coeff = 0;
x->x_ctl->c_coef = ftofix(coeff);
}
static t_int *sighip_perform(t_int *w)
{
t_sample *in = (t_sample *)(w[1]);
t_sample *out = (t_sample *)(w[2]);
t_hipctl *c = (t_hipctl *)(w[3]);
int n = (t_int)(w[4]);
int i;
t_sample last = c->c_x;
t_sample coef = c->c_coef;
for (i = 0; i < n; i++)
{
t_sample new = *in++ + mult(coef,last);
*out++ = new - last;
last = new;
}
if (PD_BADFLOAT(last))
last = 0;
c->c_x = last;
return (w+5);
}
static void sighip_dsp(t_sighip *x, t_signal **sp)
{
x->x_sr = sp[0]->s_sr;
sighip_ft1(x, x->x_hz);
dsp_add(sighip_perform, 4,
sp[0]->s_vec, sp[1]->s_vec,
x->x_ctl, sp[0]->s_n);
}
static void sighip_clear(t_sighip *x, t_floatarg q)
{
#ifdef ROCKBOX
(void) q;
#endif
x->x_cspace.c_x = 0;
}
void hip_tilde_setup(void)
{
sighip_class = class_new(gensym("hip~"), (t_newmethod)sighip_new, 0,
sizeof(t_sighip), 0, A_DEFFLOAT, 0);
CLASS_MAINSIGNALIN(sighip_class, t_sighip, x_f);
class_addmethod(sighip_class, (t_method)sighip_dsp, gensym("dsp"), 0);
class_addmethod(sighip_class, (t_method)sighip_ft1,
gensym("ft1"), A_FLOAT, 0);
class_addmethod(sighip_class, (t_method)sighip_clear, gensym("clear"), 0);
class_sethelpsymbol(sighip_class, gensym("lop~-help.pd"));
}
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