/******************************************************
 *
 * 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"

/* ------------------------------------------------------------------------------ */

/* demux~ : demultiplex a signal to a specified output */

static t_class *demux_class;

typedef struct _demux {
  t_object x_obj;

  int output;

  int n_out;
  t_float **out;

} t_demux;

static void demux_output(t_demux *x, t_floatarg f)
{
  if ((f>=0)&&(f<x->n_out)){
    x->output=f;
  } else
    error("demultiplex: %d is channel out of range (0..%d)", (int)f, x->n_out);
}


static t_int *demux_perform(t_int *w)
{
  t_demux *x = (t_demux *)(w[1]);
  t_float *in = (t_float *)(w[2]);
  int N = (int)(w[3]);
  int n = N;


  int channel=x->n_out;


  while(channel--){
    t_float*out=x->out[channel];
    n=N;
    if(x->output==channel){
      while(n--)*out++=*in++;
    } else
      while(n--)*out++=0.f;
  }
  return (w+4);
}

static void demux_dsp(t_demux *x, t_signal **sp)
{
  int n = x->n_out;
  t_float **dummy=x->out;
  while(n--)*dummy++=sp[x->n_out-n]->s_vec;
  dsp_add(demux_perform, 3, x, sp[0]->s_vec, sp[0]->s_n);
}


static void demux_helper(void)
{
  post("\n%c demux~\t:: demultiplex a signal to one of various outlets", HEARTSYMBOL);
  post("<#out>\t : the outlet-number (counting from 0) to witch the inlet is routed"
       "'help'\t : view this");
  post("creation : \"demux~ [arg1 [arg2...]]\"\t: the number of arguments equals the number of outlets\n");
}

static void demux_free(t_demux *x)
{
  freebytes(x->out, x->n_out * sizeof(t_float *));
}

static void *demux_new(t_symbol *s, int argc, t_atom *argv)
{
	t_demux *x = (t_demux *)pd_new(demux_class);
	int i;
        ZEXY_USEVAR(s);
        ZEXY_USEVAR(argv);

	if (!argc)argc=2;
	x->n_out=argc;
	x->output=0;

	while(argc--)outlet_new(&x->x_obj, gensym("signal"));

	x->out = (t_float **)getbytes(x->n_out * sizeof(t_float *));
	i=x->n_out;
	while(i--)x->out[i]=0;

	return (x);
}

void demultiplex_tilde_setup(void)
{
	demux_class = class_new(gensym("demultiplex~"), (t_newmethod)demux_new, (t_method)demux_free, sizeof(t_demux), 0, A_GIMME, 0);
	class_addcreator((t_newmethod)demux_new, gensym("demux~"), A_GIMME, 0);

	class_addfloat(demux_class, demux_output);
	class_addmethod(demux_class, (t_method)demux_dsp, gensym("dsp"), 0);
	class_addmethod(demux_class, nullfn, gensym("signal"), 0);

	class_addmethod(demux_class, (t_method)demux_helper, gensym("help"), 0);
	class_sethelpsymbol(demux_class, gensym("zexy/demultiplex~"));

  zexy_register("demultiplex~");
}
void demux_tilde_setup(void)
{
	demultiplex_tilde_setup();
}