#include "spectral/dct.h"
#include "spectral/mfcc.h"
-#ifdef HAVE_NOOPT
-#define HAVE_SLOW_DCT 1
-#endif
-
/** Internal structure for mfcc object */
struct _aubio_mfcc_t
uint_t n_coefs; /** number of coefficients (<= n_filters/2 +1) */
aubio_filterbank_t *fb; /** filter bank */
fvec_t *in_dct; /** input buffer for dct * [fb->n_filters] */
-#if defined(HAVE_SLOW_DCT)
- fmat_t *dct_coeffs; /** DCT transform n_filters * n_coeffs */
-#else
- aubio_dct_t *dct;
- fvec_t *output;
-#endif
+ aubio_dct_t *dct; /** dct object */
+ fvec_t *output; /** dct output */
smpl_t scale;
};
/* allocate space for mfcc object */
aubio_mfcc_t *mfcc = AUBIO_NEW (aubio_mfcc_t);
-#if defined(HAVE_SLOW_DCT)
- smpl_t scaling;
-
- uint_t i, j;
-#endif
mfcc->win_s = win_s;
mfcc->samplerate = samplerate;
/* allocating buffers */
mfcc->in_dct = new_fvec (n_filters);
-#if defined(HAVE_SLOW_DCT)
- mfcc->dct_coeffs = new_fmat (n_coefs, n_filters);
-
- /* compute DCT transform dct_coeffs[j][i] as
- cos ( j * (i+.5) * PI / n_filters ) */
- scaling = 1. / SQRT (n_filters / 2.);
- for (i = 0; i < n_filters; i++) {
- for (j = 0; j < n_coefs; j++) {
- mfcc->dct_coeffs->data[j][i] =
- scaling * COS (j * (i + 0.5) * PI / n_filters);
- }
- mfcc->dct_coeffs->data[0][i] *= SQRT (2.) / 2.;
- }
-#else
mfcc->dct = new_aubio_dct (n_filters);
mfcc->output = new_fvec (n_filters);
-#endif
mfcc->scale = 1.;
/* delete buffers */
del_fvec (mf->in_dct);
-#if defined(HAVE_SLOW_DCT)
- del_fmat (mf->dct_coeffs);
-#else
del_aubio_dct (mf->dct);
del_fvec (mf->output);
-#endif
/* delete mfcc object */
AUBIO_FREE (mf);
void
aubio_mfcc_do (aubio_mfcc_t * mf, const cvec_t * in, fvec_t * out)
{
-#ifndef HAVE_SLOW_DCT
fvec_t tmp;
-#endif
/* compute filterbank */
aubio_filterbank_do (mf->fb, in, mf->in_dct);
if (mf->scale != 1) fvec_mul (mf->in_dct, mf->scale);
/* compute mfccs */
-#if defined(HAVE_SLOW_DCT)
- fmat_vecmul(mf->dct_coeffs, mf->in_dct, out);
-#else
aubio_dct_do(mf->dct, mf->in_dct, mf->output);
// copy only first n_coeffs elements
// TODO assert mf->output->length == n_coeffs
tmp.data = mf->output->data;
tmp.length = out->length;
fvec_copy(&tmp, out);
-#endif
return;
}