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src/spectral/filterbank.{c,h}: add function to set coefficients

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

+++ b/src/spectral/filterbank.c

@@ -87,3 +87,10 @@

 {

   return f->filters;

 }

+

+uint_t

+aubio_filterbank_set_coeffs (aubio_filterbank_t * f, fvec_t * filters)

+{

+  fvec_copy(filters, f->filters);

+  return 0;

+}

--- a/src/spectral/filterbank.h

+++ b/src/spectral/filterbank.h

@@ -70,6 +70,13 @@

  */

 fvec_t *aubio_filterbank_get_coeffs (aubio_filterbank_t * f);

+/** copy filter coefficients to the filterbank

+

+  \param f filterbank object to get coefficients from

+

+ */

+uint_t aubio_filterbank_set_coeffs (aubio_filterbank_t * f, fvec_t * filters);

+

 #ifdef __cplusplus

 }

 #endif