[Mp4-tech] Question on the BS value grouping of edges

[Alan Yan - SH]

Dear Experts,
While reading deblocking parts, there is a BS calculation.
In the reference code JM86, I see it iterates for each 16 pixels of the
whole horizontal or vertical edge. 
But we know it can be simplified, for example maybe the 4 pixels of one
4x4 block edge of internal edges share the same BS value, so they can be
grouped to use one same BS value.
When it comes to the left vertical MB boundary edge, the situation is
kind of complicated when MBAFF mode is used. I think it may have a
maximum of 8 different BS group value for this edge, is it correct? And
from top to bottom, the BS values for pixel position of 0, 3, 4, 7, 8,
11, 12, 15 seem to be representative BS values for this edge, is it
right? And the other couple pixel of these 8 pixels can change with
different neighbor MBFDF situations, is it correct?
Can you point me to some valuable documents which help to clarify and
conclude different situations on the "BS value grouping of edges" topic?
Best Regards,
alan
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