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src/spectral/dct.c: ooura supports any power of 2

--- a/src/spectral/dct.c

+++ b/src/spectral/dct.c

@@ -124,8 +124,8 @@

     goto plain;

   }

 #else

-  // ooura does not support sizes < 16 or non-power of 2

-  if (aubio_is_power_of_two(size) != 1 || size < 16) {

+  // ooura support sizes that are power of 2

+  if (aubio_is_power_of_two(size) != 1) {

     goto plain;

   }

   s->dct = (void *)new_aubio_dct_ooura (size);