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tests/src/spectral/: improve test examples

--- a/tests/src/spectral/test-filterbank.c

+++ b/tests/src/spectral/test-filterbank.c

@@ -3,17 +3,14 @@

 #include <stdio.h>

 #include <aubio.h>

-int

-main (void)

-{

-  /* allocate some memory */

-  uint_t win_s = 1024;          /* window size */

-  uint_t n_filters = 13;        /* number of filters */

-  cvec_t *in = new_cvec (win_s);      /* input buffer */

-  fvec_t *out = new_fvec (win_s);     /* input buffer */

+int main (void) {

+  uint_t win_s = 1024; // window size

+  uint_t n_filters = 13; // number of filters

+  cvec_t *in = new_cvec (win_s); // input buffer

+  fvec_t *out = new_fvec (win_s); // vector output */

   fmat_t *coeffs = NULL;

-  /* allocate fft and other memory space */

+  // create filterbank

   aubio_filterbank_t *o = new_aubio_filterbank (n_filters, win_s);

   coeffs = aubio_filterbank_get_coeffs (o);

--- a/tests/src/spectral/test-filterbank_mel.c

+++ b/tests/src/spectral/test-filterbank_mel.c

@@ -7,10 +7,10 @@

 main (void)

 {

   /* allocate some memory */

-  uint_t win_s = 512;           /* fft size */

-  uint_t n_filters = 40;        /* number of filters */

-  cvec_t *in = new_cvec (win_s);      /* input buffer */

-  fvec_t *out = new_fvec (win_s);     /* input buffer */

+  uint_t win_s = 512; // fft size

+  uint_t n_filters = 40; // number of filters

+  cvec_t *in_spec = new_cvec (win_s); // input buffer */

+  fvec_t *out_filters = new_fvec (n_filters); // output coeffs */

   fmat_t *coeffs = NULL;

   smpl_t samplerate = 16000.;

@@ -21,19 +21,19 @@

   aubio_filterbank_set_mel_coeffs_slaney (o, samplerate);

   coeffs = aubio_filterbank_get_coeffs (o);

-  if (coeffs == NULL) {

-    return -1;

-  }

-  //fmat_print (coeffs);

+  fmat_print (coeffs);

   //fprintf(stderr, "%f\n", fvec_sum(coeffs));

-  aubio_filterbank_do (o, in, out);

+  aubio_filterbank_do (o, in_spec, out_filters);

+  fvec_print(in_spec);

+  fvec_print(out_filters);

+

   del_aubio_filterbank (o);

-  del_cvec (in);

-  del_fvec (out);

+  del_cvec (in_spec);

+  del_fvec (out_filters);

   aubio_cleanup ();

   return 0;