[Mp4-tech] [H.264] IntraChroma Prediction in reference s/w

[hari prasath]

Dear experts,
This question is with reference to Intra chroma prediction in Reference S/W
in the encode_one_macroblock function.
1)The H.264 AVC encodes the MB by iterating all the luma intra decisions for
each possible chroma intra prediction modes....i.e a for loop which iterates
for the 4 intra chroma prediction modes inside which there is another loop
which iterates for 9 modes.....Why such an approach is used.
2)I am also confused about the ctr16x16 variable in the same function.....
3)Why the order of modes in the mb_mode_table array  should not be
altered(refering to mode_decision.c)
Thanks in advance for clearing this doubt.
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