526b5580da
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@21070 a1c6a512-1295-4272-9138-f99709370657
53 lines
1.2 KiB
C
53 lines
1.2 KiB
C
#include <m_pd.h>
|
|
#include <m_fixed.h>
|
|
|
|
#define LOGTEN 2.302585092994
|
|
|
|
typedef struct dbtopow_tilde
|
|
{
|
|
t_object x_obj;
|
|
float x_f;
|
|
} t_dbtopow_tilde;
|
|
|
|
t_class *dbtopow_tilde_class;
|
|
|
|
static void *dbtopow_tilde_new(void)
|
|
{
|
|
t_dbtopow_tilde *x = (t_dbtopow_tilde *)pd_new(dbtopow_tilde_class);
|
|
outlet_new(&x->x_obj, gensym("signal"));
|
|
x->x_f = 0;
|
|
return (x);
|
|
}
|
|
|
|
static t_int *dbtopow_tilde_perform(t_int *w)
|
|
{
|
|
float *in = *(t_float **)(w+1), *out = *(t_float **)(w+2);
|
|
t_int n = *(t_int *)(w+3);
|
|
for (; n--; in++, out++)
|
|
{
|
|
float f = *in;
|
|
if (f <= 0) *out = 0;
|
|
else
|
|
{
|
|
if (f > 870)
|
|
f = 870;
|
|
*out = exp((LOGTEN * 0.1) * (f-100.));
|
|
}
|
|
}
|
|
return (w + 4);
|
|
}
|
|
|
|
static void dbtopow_tilde_dsp(t_dbtopow_tilde *x, t_signal **sp)
|
|
{
|
|
post("warning: %s not usable yet",__FUNCTION__);
|
|
dsp_add(dbtopow_tilde_perform, 3, sp[0]->s_vec, sp[1]->s_vec, sp[0]->s_n);
|
|
}
|
|
|
|
void dbtopow_tilde_setup(void)
|
|
{
|
|
dbtopow_tilde_class = class_new(gensym("dbtopow~"), (t_newmethod)dbtopow_tilde_new, 0,
|
|
sizeof(t_dbtopow_tilde), 0, 0);
|
|
CLASS_MAINSIGNALIN(dbtopow_tilde_class, t_dbtopow_tilde, x_f);
|
|
class_addmethod(dbtopow_tilde_class, (t_method)dbtopow_tilde_dsp, gensym("dsp"), 0);
|
|
}
|
|
|