[FFmpeg-devel] [PATCH v2 6/9] cbs_av1: Implement parser entrypoint

[James Almer]

On 4/2/2019 3:36 PM, James Almer wrote:
> On 4/1/2019 8:39 PM, Mark Thompson wrote:
>> ---
>> Unsure about this one - while the patch is short, it's rather invasive in a pretty ugly way with how it abuses the read call.  It will still do allocations for the decomposition because of that, even though we don't really want them.
>>
>> Any ideas welcome.
> 
> How about copying most of cbs_av1_read_unit() into cbs_av1_parse_obu(),
> factorizing the parts that can be shared (like pretty much everything
> before the switch), without the call to ff_cbs_alloc_unit_content() and
> only bothering to parse Sequence Header, Frame Header, Frame (Only the
> header, and not the Tile Group part), using the needed structs on stack?
> You wouldn't have to worry about cbs_av1_ref_tile_data() being called
> with unit->data_ref as NULL at all.

So Tile Groups probably need to be parsed to set seen_frame_header back
to 0 before the next frame, but you can still skip the
cbs_av1_ref_tile_data() calls with the above suggestion.