[Mp4-tech] Regarding CAVLC in H.264

[Shinjith Unithrattil]

hi Experts,
                I am working on H.264 decoder.can any one tell me 
1) "how  can I know which level                 (Intra16*16DClevel/Intra16*16AClevel/chromaDClevel/chromaAClevel) is invoking 
CAVLC process?"
2) document regarding detail explanation of "Residual data semantics"
Regards,
satish
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