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/* runningmean.c MP 20080516 */
/* output the running mean of the input */
#include "m_pd.h"
/* We implement a circular buffer x_data of length x_n and */
/* add all the values in it and divide by the */
/* number of values to get the mean x_mean. */
/* for simplicity and to avoid reallocation problems, we preallocate a longish array for the data */
#define RUNNINGMEAN_MAX 1024 /* arbitrary maximum length of the data list*/
typedef struct _runningmean
{
t_object x_obj;
t_int x_in1;
t_int x_in2;
t_int x_in3;
t_outlet *x_out;
t_inlet *x_inlet2;
t_int x_n;
t_float x_data[RUNNINGMEAN_MAX];
t_float x_mean;
t_int x_pointer;
} t_runningmean;
static t_class *runningmean_class;
void runningmean_setup(void);
static void *runningmean_new(t_symbol *s, t_floatarg f);
static void runningmean_free(t_runningmean *x);
static void runningmean_bang(t_runningmean *x);
static void runningmean_float(t_runningmean *x, t_float f);
static void runningmean_length(t_runningmean *x, t_float f);
static void runningmean_zero(t_runningmean *x);
static void runningmean_float(t_runningmean *x, t_float f)
{
float *p = x->x_data;
float total = 0;
int i;
/* add a float at the current location, overwriting the oldest data */
x->x_data[x->x_pointer] = f;
if (++x->x_pointer >= x->x_n) x->x_pointer = 0; /* wrap pointer */
for (i = 0; i < x->x_n; ++i) total += *p++;
x->x_mean = total/x->x_n;
outlet_float(x->x_out, x->x_mean);
return;
}
static void runningmean_bang(t_runningmean *x)
{
outlet_float(x->x_out, x->x_mean);
return;
}
static void runningmean_length(t_runningmean *x, t_float f)
{
if ((f >= 1) && ((int)f == f) && (f < RUNNINGMEAN_MAX))
{
x->x_n = (int)f;
runningmean_zero(x);
}
else post("runningmean length must be an integer between 1 and %d.", RUNNINGMEAN_MAX);
return;
}
static void runningmean_zero(t_runningmean *x)
{
float *p = x->x_data;
int i;
/* zero the entire array */
for (i = 0; i < RUNNINGMEAN_MAX; ++i) *p++ = 0;
x->x_mean = 0;
x->x_pointer = 0;
return;
}
static void runningmean_free(t_runningmean *x)
{
return;
}
static void *runningmean_new(t_symbol *s, t_floatarg f)
{
t_runningmean *x;
post("runningmean_new %f", f);
x = (t_runningmean *)pd_new(runningmean_class);
if (x == NULL) return (x);
x->x_out = outlet_new((t_object *)x, &s_float);
x->x_inlet2 = inlet_new(&x->x_obj, &x->x_obj.ob_pd, &s_float, gensym("length"));
if (!((f >= 1) && ((int)f == f) && (f < RUNNINGMEAN_MAX)))
{
post("runningmean length %f must be an integer between 1 and %d, using %d", f, RUNNINGMEAN_MAX, RUNNINGMEAN_MAX);
f = RUNNINGMEAN_MAX;
}
{
x->x_n = (int)f;
runningmean_zero(x);
}
return (x);
}
void runningmean_setup(void)
{
runningmean_class = class_new
(
gensym("runningmean"),
(t_newmethod)runningmean_new,
(t_method)runningmean_free,
sizeof(t_runningmean),
CLASS_DEFAULT,
A_DEFFLOAT,
0
); /* one argument for length */
class_addbang(runningmean_class, runningmean_bang);
class_addfloat(runningmean_class, runningmean_float);
class_addmethod(runningmean_class, (t_method)runningmean_length, gensym("length"), A_FLOAT, 0);
class_addmethod(runningmean_class, (t_method)runningmean_zero, gensym("clear"), 0);
}
/* end runningmean.c */
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