[FFmpeg-devel] [PATCH v2 2/3] vaapi_encode: Rewrite slice/tile support

[Mark Thompson]

On 14/08/2020 10:30, Linjie Fu wrote:
> On Fri, Aug 14, 2020 at 5:51 AM Mark Thompson <sw at jkqxz.net> wrote:
>>
>> This precalculates all of the information we will need to define slice
>> and tile positions at init time rather than rebuilding some of it with
>> every slice.  The control of tiles is generalised to match slices, so that
>> arbitrary tile and slice layouts are possible within the constraint that
>> slices can't cross tile boundaries (which comes from how VAAPI handles
>> slices and tiles).  Support for the EQUAL_MULTI_ROWS slice structure fits
>> easily into this, so it is added at the same time.
> 
> Some inputs for EQUAL_MULTI_ROWS slice structure, I believe there are
> some discussions in libva and hw behavior team. To be honest, I don't think
> the current notation/comment is suitable for what the hw could do.

I'm not sure what you mean here.  If some hardware needs a different slice structure then a new one will need to be defined and implemented?

Even if you don't have any current hardware using it, it is likely to be useful in the not-too-distant future given that it is the VP9/AV1 uniform tiling mode.

- Mark