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

[Karsten Suehring]

Suraj,
the getNeighbour function is an implementation of section 6.4.9
(Derivation process for neighbouring locations).
On the upper border the neighboring pixels are always inside the same
three blocks pix_d(-1,-1) pix_b(0..3;-1) and pix_c(4,-1). If macroblock
apadtive frame/field is enabled, the pixel position of each line on the
left border depends on the frame/field coding mode of the current and
the neighbour macroblock.
I think the implementation could probably be a bit more simplified, but
I think the current version is easier to understand.
Best regards,
Karsten
Alexis Michael Tourapis wrote:
> Btw for this one, I believe the answer is related to MBAFF since pix_a
> corresponds to the left prediction samples which be coming from fields or
> frames. I guess you could respond to this one yourself :).
> 
> Alexis
> 
> -----Original Message-----
> From: mp4-tech-bounces lists.mpegif.org
> [mailto:mp4-tech-bounces lists.mpegif.org] On Behalf Of suraj kumar
> Sent: Friday, February 25, 2024 3:57 AM
> To: mp4-tech lists.mpegif.org
> Subject: [Mp4-tech] intraprediction part-h.264 JM9.2
> 
> 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
> 
> ________________________________________________________________________
> Yahoo! India Matrimony: Find your life partner online
> Go to: http://yahoo.shaadi.com/india-matrimony
> _______________________________________________
> NOTE: Please use clear subject lines for your posts. Include [audio,
> [video], [systems], [general] or another apppropriate identifier to indicate
> the type of question you have.
> 
> Note: Conduct on the mailing list is subject to the Antitrust guidelines
> found at
> http://www.mpegif.org/public/documents/vault/mp-out-30042-Antitrust.php
> 
>