Qsys VIP to make Encoder

Hi,

I am new to Altera software and am trying to develop a video encoder using the VIP suite in Qsys environment. I am wondering how the MegaFunctions translate over to typical design structure?

For example, if I am needing to create a DCT (H264) block using the VIP functions, which functions (if any) should I be using to do this? Maybe I have the wrong idea of how to use the VIP suite?

EDIT:

Although I did not find an answer to this question, I have found some nice code on OpenCores.org. A project includes some VHDL code for DCT transform, quantizers, etc. They also target Altera's Cyclone III devices, although the specs indicate the code is better suited for Spartan 3A devices due to power consumption.