server iot
server iot

Reputation: 1

How to produce same mfcc result as librosa using aubio?

I am trying to calculate Mfcc feature in C++. And I found Aubio (https://github.com/aubio/aubio) but I cannot produce same result as Librosa of Python (this is important). Librosa code:

X, sample_rate = sf.read(file_name, dtype='float32')
mfccs = librosa.feature.mfcc(y=X, sr=sample_rate, n_mfcc=40)

Aubio code:

#include "utils.h"
#include "parse_args.h"
#include <stdlib.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 = 128;
uint_t n_coefs = 40;

 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  = 2048;
  hop_size = 512;

  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(process_block, process_print);
  printf("\nlen=%u\n", mfcc_out->length);
  del_aubio_pvoc (pv);
  del_cvec (fftgrain);
  del_aubio_mfcc(mfcc);
  del_fvec(mfcc_out);

beach:
  examples_common_del();
  return ret;
}

Please help to obtain same result of Librosa or suggest any C++ library do this well. Thanks

Upvotes: 0

Views: 1589

Answers (1)

SuperKogito
SuperKogito

Reputation: 2966

This might be what you are looking for: C Speech Features The library is a complete port of python_speech_features to C and according to the documentation, you should be able to use it in a C++ projects. The results will not be the same of Librosa, here is why but you should be able to work with them.

Upvotes: 1

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