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how to write a codec for codec engine xdais

Hello,

I'm quite new to the codec engine issue and I almost read around 100 pdf files. I read that the codec has to be xdais compilant, xdm compilant and needs a IALG interface, but it confuses me. 

What does it mean that my codec has to be xdais compilant? which functions do I need to add that the codec will work with the codec enging? 

do you know a clear overview of the functions that has to be available in the codec?

or maybe you know I really good guide/tutorial which brings me through the codec development?

Sorry for the noob questions.

Thanks in advance!

Tom