[Mp4-tech] nc calculation in CAVLC

[Chaitanya Atluru]

Hi
     I have missed this while going through the standard. I am trying to
calculate nc (na+nb+1 >> 1) for the table selection of Table 9-5. While
calculating nc should I consider na and nb if they belong to a different
slice group than the one for which I am calculating nc for. Also in the FMO
you can implement a spiral mapping, does it mean the slices from the same
slice group are in spiral order, If thats the case how can we claculate the
nc.
Thank You
Chaitanya
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