[Mp4-tech] Regarding reference picture management

[Pooja Sharma]

Hi All,
          I am  going  through the decoding process for reference picture
list constructions(H.264 standard) , i hav  a few doubts if  anyone can
clarify.
1. I am not clear with the  usage of  variable frameNumWrap
   As per the standard
        if (Frame_num >frame_num)
            framenumwrap = frame_num - Maxframenum
       else
             framenumwrap = frame_num
My  doubt here is that under what conditions Frame_num can be  greater than
frame_num.
2. when field_pic_flag = 1, pic_num is derived as follows
     pic_num = 2 x framenumwrap + 1 ........if the  refernce  field has the
same parity as the current  field..
    Does it mean that when bottom_field_flag is 0  picnum = 2 x
framenumwrap  and when
  bottom_field_flag =1 pic_num =  2 x framenumwrap + 1 ?
3.Can  anyone explain the pseudo code described  in expression 8-38 in
reordering where it  talks bout
  some  function  PicNumF(refPicListX[cidx]).
Regards
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