rockbox/apps/plugins/pdbox/PDa/intern/dbtopow~.c

#ifdef ROCKBOX
#include "plugin.h"
#include "pdbox.h"
#endif

#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)
{
#ifdef ROCKBOX
    (void) x;
#endif
    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);
}