Someone recently posted here asking about synthesizable
VHDL Macros for MPEG, IDCT etc.  I'm afraid the article
has expired, so I can't reply directly.

I have a friend who is designing VHDL Macros, or FISPs
(Foundry Independant Standard Products) in VHDL, for the
multimedia area.  If you are interested, you may want to
contact him directly :-

Chris.