Codec Customization

Hi to everyone,
I hope that the question i'm going to ask is 
in the right list, if not please tell me which
is the proper one.
Anyway, I'm trying to customize the codec xine uses 
to decode ISO MPEG4 movies in order to use an hardware 
decoder on a custom embedded ARM platform. 
This HW decoder works with in a simple way:
*) read the video stream and fill a buffer
*) you let the decoder eat it
*) read the new frame and refill the buffer
*) loop ;) 

Looking through the xine source tree, i stumbled 
into h263.c and h263dec.c, that seem to me the right files
to edit, but the trouble is that, even after looking at the 
doc, I'm not able to find exactly what and where to change.

Can please anyone help me ? 

Thanks in advance 

Lorenzo 
 
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