source: examples/aubiomfcc.c @ e458af4

/*
  Copyright (C) 2007-2013 Paul Brossier <piem@aubio.org>

  This file is part of aubio.

  aubio 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 3 of the License, or
  (at your option) any later version.

  aubio 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 aubio.  If not, see <http://www.gnu.org/licenses/>.

*/

#include "utils.h"
#include "parse_args.h"

aubio_pvoc_t *pv;    // a phase vocoder
cvec_t *fftgrain;    // outputs a spectrum
aubio_mfcc_t * mfcc; // which the mfcc will process
fvec_t * mfcc_out;   // to get the output coefficients

uint_t n_filters = 40;
uint_t n_coefs = 13;

void process_block (fvec_t *ibuf, fvec_t *obuf)
{
  fvec_zeros(obuf);
  //compute mag spectrum
  aubio_pvoc_do (pv, ibuf, fftgrain);
  //compute mfccs
  aubio_mfcc_do(mfcc, fftgrain, mfcc_out);
}

void process_print (void)
{
  /* output times in selected format */
  print_time (blocks * hop_size);
  outmsg ("\t");
  /* output extracted mfcc */
  fvec_print (mfcc_out);
}

int main(int argc, char **argv) {
  int ret = 0;
  // change some default params
  buffer_size  = 512;
  hop_size = 256;

  examples_common_init(argc,argv);

  verbmsg ("using source: %s at %dHz\n", source_uri, samplerate);
  verbmsg ("buffer_size: %d, ", buffer_size);
  verbmsg ("hop_size: %d\n", hop_size);

  pv = new_aubio_pvoc (buffer_size, hop_size);
  fftgrain = new_cvec (buffer_size);
  mfcc = new_aubio_mfcc(buffer_size, n_filters, n_coefs, samplerate);
  mfcc_out = new_fvec(n_coefs);
  if (pv == NULL || fftgrain == NULL || mfcc == NULL || mfcc_out == NULL) {
    ret = 1;
    goto beach;
  }

  examples_common_process((aubio_process_func_t)process_block, process_print);

  del_aubio_pvoc (pv);
  del_cvec (fftgrain);
  del_aubio_mfcc(mfcc);
  del_fvec(mfcc_out);

beach:
  examples_common_del();
  return ret;
}