[x264-devel] when Half pixel value calculated

[Erkang Chen]

Dear all:
In x264 Inter encoding, when a MB is undergoing analysis, eg,. x264_mb_analyse_inter_p16x16, interpolated half_pixel value are used.
However, discouragingly, I couldn't find when these value are calculated and store to h->mb.pic.p_fref[0][i_ref][1-3] before analysis.

It hides somewhere, I know it. But where?

If you got what I am trying to ask, you can skip the following part.
Eg. in function x264_mb_analyse_inter_p16x16
Macro LOAD_HPELS( m.p_fref, h->mb.pic.p_fref[0][i_ref], 0 );
seem to load half pixel value from h->mb.pic.p_fref[0][i_ref] to m.p_fref.
Downwards, the values in m.p_fref[] is used. 
However I traced the code and didn't find where h->mb.pic.p_fref[0][i_ref][0-3] is written before the function x264_mb_analyse_inter_p16x16. 


Thanks for patience.
Best wishes!
                                                                    Erkang
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