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#include "defines.h"
/*--------------- vlmax -----------------------*/
/* leaky maximum of each element in a list */
/* arguments: [halfdecay] */
static t_class *vlmax_class;
typedef struct _vlmax
{
t_object x_obj;
t_float m_c_leak;
t_float m_leak;
t_float *m_max;
int m_n;
} t_vlmax;
static void vlmax_perform(t_vlmax *x, t_symbol *s, int argc, t_atom *argv)
{
int i;
t_atom *ap,*app;
t_float *fp;
t_float m_leak;
t_float m_c_leak;
m_leak=x->m_leak;
m_c_leak=x->m_c_leak;
if (argc!=x->m_n)
{
if (x->m_max)
freebytes(x->m_max,x->m_n);
x->m_max=(t_float*)getbytes(argc*sizeof(t_float));
for(i=0;i<argc;i++)
x->m_max[i]=0.0;
x->m_n=argc;
}
fp=x->m_max;
ap = (t_atom *)getbytes(sizeof(t_atom)*argc);
app=ap;
for (i = 0; i < argc; i++)
{
t_float f=atom_getfloat(argv++);
*fp =(f > *fp ) ? f : *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);
if (s) {} // prevent compiler complaint
}
static void vlmax_setHalfDecay(t_vlmax *x, t_floatarg halfDecayTime)
{
if (halfDecayTime <= 1.) halfDecayTime = 1;
x->m_c_leak=(t_float)powf(.5,(1.0/halfDecayTime));
x->m_leak=1.0-x->m_c_leak;
}
static void *vlmax_new(t_float halfDecayTime)
{
t_vlmax *x=(t_vlmax *)pd_new(vlmax_class);
outlet_new(&x->x_obj, gensym("list"));
vlmax_setHalfDecay(x, halfDecayTime);
x->m_n=0;
x->m_max=0;
return (void *)x;
}
static void vlmax_free(t_vlmax *x)
{
freebytes(x->m_max,x->m_n);
}
void vlmax_setup(void)
{
vlmax_class = class_new(gensym("vlmax"),
(t_newmethod)vlmax_new, (t_method)vlmax_free,
sizeof(t_vlmax),
CLASS_DEFAULT,
A_DEFFLOAT, 0);
class_addmethod(vlmax_class, (t_method)vlmax_setHalfDecay,
gensym("decay"), A_DEFFLOAT, NULL);
class_addlist(vlmax_class, (t_method)vlmax_perform);
}
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