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#include "defines.h"
/*--------------- vlavg -----------------------*/
/* leaky average of each element in a list */
/* arguments: [halfdecay] */
static t_class *vlavg_class;
typedef struct _vlavg
{
t_object x_obj;
float m_c_leak;
float m_leak;
float *m_avg;
int m_n;
} t_vlavg;
static void vlavg_perform(t_vlavg *x, t_symbol *s, int argc, t_atom *argv)
{
int i;
t_atom *ap,*app;
float *fp;
float m_leak;
float m_c_leak;
m_leak=x->m_leak;
m_c_leak=x->m_c_leak;
if (argc!=x->m_n)
{
int i;
if (x->m_avg)
freebytes(x->m_avg,x->m_n);
x->m_avg=(float*)getbytes(argc*sizeof(float));
for(i=0;i<argc;i++)
x->m_avg[i]=0.0f;
x->m_n=argc;
}
fp=x->m_avg;
ap = (t_atom *)getbytes(sizeof(t_atom)*argc);
app=ap;
for (i = 0; i < argc; i++)
{
float f=atom_getfloat(argv++);
*fp = *fp * m_c_leak + f * m_leak;
SETFLOAT(app, *fp);
app++;
fp++;
}
outlet_list(x->x_obj.ob_outlet,gensym("list"),argc,ap);
freebytes(ap,argc);
}
static void vlavg_setHalfDecay(t_vlavg *x, t_floatarg halfDecayTime)
{
x->m_c_leak=(float)powf(.5,(1.0f/halfDecayTime));
x->m_leak=1.0f-x->m_c_leak;
}
static void *vlavg_new(t_float halfDecayTime)
{
t_vlavg *x=(t_vlavg *)pd_new(vlavg_class);
outlet_new(&x->x_obj, gensym("list"));
vlavg_setHalfDecay(x, halfDecayTime);
x->m_n=0;
x->m_avg=0;
return (void *)x;
}
static void vlavg_free(t_vlavg *x)
{
freebytes(x->m_avg,x->m_n);
}
void vlavg_setup(void)
{
vlavg_class = class_new(gensym("vlavg"),
(t_newmethod)vlavg_new, (t_method)vlavg_free,
sizeof(t_vlavg),
CLASS_DEFAULT,
A_DEFFLOAT, 0);
class_addmethod(vlavg_class, (t_method)vlavg_setHalfDecay,
gensym("decay"), A_DEFFLOAT, NULL);
class_addlist(vlavg_class, (t_method)vlavg_perform);
}
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