sharing buffers for forward and inverse DCT

Hi,

From the documentation, it is not clear weather ippsDCTFwdInit_32f and ippsDCTInvInit_32f can share the same memory space.

For a given length, ippsDCTFwdGetSize_32f and ippsDCTInvGetSize_32f do return the same sizes, and allocating the Ipp8u buffers once for both forward and inverse transform seems to work.

However, I assume there is a reason for which both pairs of functions exist.

Any clue?

thanks, piem