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filterbank.{c,h}: add aubio_filterbank_get_channel function

--- a/src/filterbank.c

+++ b/src/filterbank.c

@@ -22,6 +22,7 @@

 #include "aubio_priv.h"

 #include "sample.h"

 #include "filterbank.h"

+#include "mathutils.h"

 #include "stdio.h"

@@ -124,8 +125,7 @@

   //filling the fft_freqs lookup table, which assigns the frequency in hz to each bin

   for(bin_cnt=0; bin_cnt<win_s; bin_cnt++){

-    //TODO: check the formula!

-    fft_freqs->data[0][bin_cnt]= (smpl_t)samplerate* (smpl_t)bin_cnt/ (smpl_t)win_s;

+    fft_freqs->data[0][bin_cnt]= aubio_bintofreq(bin_cnt, samplerate, win_s);

   }

   //building each filter table

@@ -213,4 +213,9 @@

   }

   return;

+}

+

+fvec_t * aubio_filterbank_getchannel(aubio_filterbank_t * f, uint_t channel) {

+  if ( (channel >= 0) && (channel < f->n_filters) ) { return f->filters[channel]; }

+  else { return NULL; }

 }

--- a/src/filterbank.h

+++ b/src/filterbank.h

@@ -67,6 +67,11 @@

 */

 void aubio_filterbank_do(aubio_filterbank_t * fb, cvec_t * in, fvec_t *out);

+/** return the vector containing the filter coefficients of one channel

+

+ */

+fvec_t * aubio_filterbank_getchannel(aubio_filterbank_t * f, uint_t channel);

+

 #ifdef __cplusplus

 }

 #endif

-- 

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