[Mp4-tech] Question regarding CAVLC Intra16x16DC decoding

[Krzysztof Szczerba]

Dear all,
I have a question regarding CAVLC decoding. I am do not know how to derive
the total number of nonzero coefficients for neighbours
Intra16x16DCLevel block. The standard draft in section 9.2.1 says that
number of non-zero transform coefficients is taken from adjacent 4x4 blocks.
By the wording of the 2nd NOTE, about parsing process of Intra16x16DCLevel,
in section 9.2.1, it sounds as if nA and nB are derived by taking the
neighbour 4x4 blocks of the 4x4 block at index 0 (According to the method of
derivation of neighboring 4x4 blocks in section 6.4.7.3 ). Then take the
TotalCoeff intra _AC_ of those two intra4x4 blocks add 1 to the TotalCoeff,
if the intraDC is not 0, for the two respective blocks. And base nC for
Intra16x16DC for the whole macroblock on this number. Is it really like
this? Any clarification would be very welcome.
Thanks in advance.
Christopher
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