/******************************************************
 *
 * zexy - implementation file
 *
 * copyleft (c) IOhannes m zmölnig
 *
 *   1999:forum::für::umläute:2004
 *
 *   institute of electronic music and acoustics (iem)
 *
 ******************************************************
 *
 * license: GNU General Public License v.2
 *
 ******************************************************/

#include "zexy.h"

/* ------------------------ average~ ----------------------------- */

/* tilde object to take absolute value. */

static t_class *avg_class;

typedef struct _avg
{
    t_object x_obj;

	t_float n_inv;
	t_float buf;
	int blocks;
} t_avg;


/* average :: arithmetic mean of one signal-vector */

static t_int *avg_perform(t_int *w)
{
    t_float *in = (t_float *)(w[1]);

	t_avg *x = (t_avg *)w[2];
    int n = (int)(w[3]);

	t_float buf = 0.;

    while (n--)
    {
		buf += *in++;
    }
    outlet_float(x->x_obj.ob_outlet, buf*x->n_inv);

    return (w+4);
}

static void avg_dsp(t_avg *x, t_signal **sp)
{
	x->n_inv=1./sp[0]->s_n;
    dsp_add(avg_perform, 3, sp[0]->s_vec, x, sp[0]->s_n);
}

static void *avg_new(void)
{
    t_avg *x = (t_avg *)pd_new(avg_class);
    outlet_new(&x->x_obj, gensym("float"));
    return (x);
}

static void avg_help(void)
{
	post("avg~\t:: outputs the arithmetic mean of each signal-vector");
}


void avg_tilde_setup(void)
{
    avg_class = class_new(gensym("avg~"), (t_newmethod)avg_new, 0,
    	sizeof(t_avg), 0, A_DEFFLOAT, 0);
    class_addmethod(avg_class, nullfn, gensym("signal"), 0);
    class_addmethod(avg_class, (t_method)avg_dsp, gensym("dsp"), 0);

	class_addmethod(avg_class, (t_method)avg_help, gensym("help"), 0);
	class_sethelpsymbol(avg_class, gensym("zexy/avg~"));
  zexy_register("avg~");
}