source: examples/aubiotrack.c @ 899dfd3

/*
   Copyright (C) 2003 Paul Brossier

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 2 of the License, or
   (at your option) any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/

#include <aubio.h>
#include "utils.h"

unsigned int pos          = 0;    /* frames%dspblocksize */
uint_t usepitch           = 0;
fvec_t * out              = NULL;
aubio_tempo_t * bt        = NULL;
smpl_t istactus           = 0;

int aubio_process(smpl_t **input, smpl_t **output, int nframes);
int aubio_process(smpl_t **input, smpl_t **output, int nframes) {
  unsigned int i;       /*channels*/
  unsigned int j;       /*frames*/
  for (j=0;j<(unsigned)nframes;j++) {
    if(usejack) {
      for (i=0;i<channels;i++) {
        /* write input to datanew */
        fvec_write_sample(ibuf, input[i][j], i, pos);
        /* put synthnew in output */
        output[i][j] = fvec_read_sample(obuf, i, pos);
      }
    }
    /*time for fft*/
    if (pos == overlap_size-1) {         
      /* block loop */
      aubio_tempo(bt,ibuf,out);
      if (out->data[0][0]>=1) 
        istactus = out->data[0][0];
      else 
        istactus = 0;
      if (istactus) {
              for (pos = 0; pos < overlap_size; pos++)
                      obuf->data[0][pos] = woodblock->data[0][pos];
      } else {
              for (pos = 0; pos < overlap_size; pos++)
                      obuf->data[0][pos] = 0.;
      }
      /* end of block loop */
      pos = -1; /* so it will be zero next j loop */
    }
    pos++;
  }
  return 1;
}

void process_print (void);
void process_print (void) {
        if (output_filename == NULL) {
                if (istactus) {
                        outmsg("%f\n",((smpl_t)(frames*overlap_size)+(istactus-1.)*overlap_size)/(smpl_t)samplerate); 
                }
                if (isonset && verbose)
                        outmsg(" \t \t%f\n",(frames)*overlap_size/(float)samplerate);
        }
}

int main(int argc, char **argv) {
  
  buffer_size = 1024;
  overlap_size = 512;
  /* override default settings */
  examples_common_init(argc,argv);

  out = new_fvec(2,channels);
  bt  = new_aubio_tempo(type_onset,buffer_size,overlap_size,channels);

  examples_common_process(aubio_process,process_print);

  del_aubio_tempo(bt);
  del_fvec(out);

  examples_common_del();

  debug("End of program.\n");

  fflush(stderr);

  return 0;
}