/**
 *
 * a puredata wrapper for aubio onset detection functions 
 *
 * Thanks to Johannes M Zmolnig for writing the excellent HOWTO:
 *       http://iem.kug.ac.at/pd/externals-HOWTO/  
 *
 * */

#include <m_pd.h>
#include <aubio.h>

char aubioonset_version[] = "aubioonset~ version 0.3";

static t_class *aubioonset_tilde_class;

void aubioonset_tilde_setup (void);

typedef struct _aubioonset_tilde
{
  t_object x_obj;
  t_float threshold;
  t_int pos;                    /*frames%dspblocksize */
  t_int bufsize;
  t_int hopsize;
  aubio_onset_t *o;
  fvec_t *in;
  fvec_t *out;
  t_outlet *onsetbang;
} t_aubioonset_tilde;

static t_int *
aubioonset_tilde_perform (t_int * w)
{
  t_aubioonset_tilde *x = (t_aubioonset_tilde *) (w[1]);
  t_sample *in = (t_sample *) (w[2]);
  int n = (int) (w[3]);
  int j;
  for (j = 0; j < n; j++) {
    /* write input to datanew */
    fvec_write_sample (x->in, in[j], 0, x->pos);
    /*time to do something */
    if (x->pos == x->hopsize - 1) {
      /* block loop */
      aubio_onset_do (x->o, x->in, x->out);
      if (fvec_read_sample (x->out, 0, 0) > 0.) {
        outlet_bang (x->onsetbang);
      }
      /* end of block loop */
      x->pos = -1;              /* so it will be zero next j loop */
    }
    x->pos++;
  }
  return (w + 4);
}

static void
aubioonset_tilde_dsp (t_aubioonset_tilde * x, t_signal ** sp)
{
  dsp_add (aubioonset_tilde_perform, 3, x, sp[0]->s_vec, sp[0]->s_n);
}

static void
aubioonset_tilde_debug (t_aubioonset_tilde * x)
{
  post ("aubioonset~ bufsize:\t%d", x->bufsize);
  post ("aubioonset~ hopsize:\t%d", x->hopsize);
  post ("aubioonset~ threshold:\t%f", x->threshold);
  post ("aubioonset~ audio in:\t%f", x->in->data[0][0]);
  post ("aubioonset~ onset:\t%f", x->out->data[0][0]);
}

static void *
aubioonset_tilde_new (t_floatarg f)
{
  t_aubioonset_tilde *x =
      (t_aubioonset_tilde *) pd_new (aubioonset_tilde_class);

  x->threshold = (f < 1e-5) ? 0.1 : (f > 10.) ? 10. : f;
  x->bufsize = 1024;
  x->hopsize = x->bufsize / 2;

  x->o = new_aubio_onset ("complex",
      x->bufsize, x->hopsize, 1, (uint_t) sys_getsr ());
  x->in = (fvec_t *) new_fvec (x->hopsize, 1);
  x->out = (fvec_t *) new_fvec (1, 1);

  floatinlet_new (&x->x_obj, &x->threshold);
  x->onsetbang = outlet_new (&x->x_obj, &s_bang);
  post (aubioonset_version);
  return (void *) x;
}

void
aubioonset_tilde_setup (void)
{
  aubioonset_tilde_class = class_new (gensym ("aubioonset~"),
      (t_newmethod) aubioonset_tilde_new,
      0, sizeof (t_aubioonset_tilde), CLASS_DEFAULT, A_DEFFLOAT, 0);
  class_addmethod (aubioonset_tilde_class,
      (t_method) aubioonset_tilde_dsp, gensym ("dsp"), 0);
  class_addmethod (aubioonset_tilde_class,
      (t_method) aubioonset_tilde_debug, gensym ("debug"), 0);
  CLASS_MAINSIGNALIN (aubioonset_tilde_class, t_aubioonset_tilde, threshold);
}