[M4IF Technotes] Round-off error in IDCT

[Morten Boysen]

Hi,
The reference decoder uses floating point in computing the IDCT. As a 
part of a schoolproject, i have to rewrite the IDCT, so it only uses 
integers. I know this will cause round-off errors, but the problem is: 
How large are these round-off errors allowed to be according to the 
standard?
Furthermore, i need the maximum allowable value of an IDCT coefficient, 
so i can save as many bits as possible.
Thanks
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