Re: [Opensvcdecoder-support] use_ref_base_pic_flag and store_ref_base_pic_flag

[jf w <jfw...@gm...>]

Dear Mederic,

Thank you for your reply.

I'll still confused about the function UpdateReferenceListAddress.
    1. Can you explain why the condition of
invoking UpdateReferenceListAddress is as follows:
             if ((Nal -> DqId != Nal -> DqIdToDisplay) && ((Nal -> DqId >>
4) == (Nal -> DqIdToDisplay >> 4)))  (SliceHeaderExtension.c line:157)
    2. UpdateReferenceListAddress is to replace some picture in RefPicListLx
with the picture, which has the same poc, in displayLayer (dqID=Nal ->
DqIdToDisplay).
        Why is the base layer picture stored in displayLayer. I think the
base layer's dqId should be Nal->DqidToDisplay>>4<<4.

Thank you very much.


2011/3/8 Médéric Blestel <Med...@in...>

>  Dear jfwang,
>
> I know that the decoder has got problems with MGS decoding process.
>
> Reference lists are created and stored into fill_default_ref_list function
> as you said.
> These lists are updated in UpdateReferenceListAddress
> (SliceHeaderExtension.c, line 162) function in order to change the memory
> address with those of the layer which is displayed.
>
> As you said, when use_ref_base_pic_flag = 1, base layer picture should be
> used as reference frmaes. So the list should not be updated in order to use
> the base layer as reference.
> Maybe, it can be corrected just by testing if use_ref_base_pic_flag is
> different of 1.
>
> Kind regards,
> Médéric
>
> Le 08/03/2011 16:12, jf w a écrit :
>
> Hi all,
>
>  The performance of opensvcdecoder is very good. But when I decode some
> video, there are some distortion. So  I'm trying to understand the code of
> opensvcdecoder. However, I encounter some problems.
>
>  I think the function fill_default_ref_list in Pic_list.c is to construct
> refPicLXl0 and refPicLXl1. But I don't find the code about the scenario
> with use_ref_base_pic_flag=1. When use_ref_base_pic_flag =1, the refPicLXl0
> and refPicLXl1 should use the reference base picture when it is available.
>
>  Is the scenario handled by other code? Any suggestion is helpful.
>
> --
> Thanks,
> jfwang
> BUAA
>
>
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-- 
Thanks,
jianfei
BUAA