I need some pointers to which libraries would be most appropriate to use.
I want to use some DFTs and DCTs for processing 1-D real data - I am completely new to the Blackfin architecture so I am trying to work as much as possible in C or with function calls.
For doing the DFT I am managing with the "rfft_fr16" functions in VisualDSP++. The "N" for my data is always a power of 2 and performance is good. However I also need to do a DCT on sets of samples where the buffer size "N" is not a power of 2. Are there any reasonably efficient library functions out there to implement this (or which I could implement using a padded buffer of say N=128)?
The only DCT library I found on analog.com is the one implementing the 8x8 DCT for image compression purposes, namely "r8x8dct.asm" but of course this doesn't handle 1-D data.
If no libraries exist I might have to roll my own function, but of course there are performance concerns there!
Thanks in advance for any hints.