[Mp4-tech] reg initialisation process for reference picture lists for B slices in H264 decoder

[Ashwani Gupta]

Dear experts,
I have one querry related to the Initialisation process for reference picture
lists for B slices in frames\fields in H264 video decoder.
In the section 8.2.4.2.3 for frames and 8.2.4.2.4 for fields in the standard,
it has been written that when the RefPicList1 has more than one entry and
refPicList1 is identical to the RefPicList0, the first two entries
RefPicList1[0] and RefPicList1[1] are swapped.
My querry is what is the significance of swapping the first two entries of
RefPicList1? I mean to say why this swapping of these two lists are required?
Could anyone help me to figure out this doubt? 
With best regards
Ashwani
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