[Mp4-tech] intraprediction part-h.264 JM9.2

[suraj kumar]

hello experts,
 i am working on H.264 TML JM9.2(FRExt) decoder code
    .I was wondering if some one could sovle my
doubts.
    In intraprediction part what does the funtions
below
    represent
     getNeighbour(mb_nr, ioff -1 , joff +i , 1,
    &pix_a[i]);
     getNeighbour(mb_nr, ioff    , joff -1 , 1,
&pix_b);
      getNeighbour(mb_nr, ioff +4 , joff -1 , 1,
&pix_c);
      getNeighbour(mb_nr, ioff -1 , joff -1 , 1,
&pix_d);
     and why does he chosen an array pix_a[i] only for
the
    first function. 
    i appriciate and indebted if someone could resovle
my
    quiries.
    thanks in advance
    with best wishes 
    suraj kumar
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