[Mp4-tech] what will be the data width of SAD

[Sankalpa Devanallikar]

Hi all,
     In Intra4x4 encoder what will be the datawidth of SAD value and
also SATD Value.I had a doubt because in JM it is taken to be 32
bit.Forhardware implementation is it considered to  be 32 bit wide
register.Because input to SAD egine will be 16 8 bit value which is current
mb and other will be 16 8 bit value of predicted ,now the sum of absolute
difference taken ,We will need a 4 stages adder.So output will be 13bit SAD.
  Can you please clear my doubts.
Warm Regards
Sankalp
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