[FFmpeg-devel] [PATCH 0/3] vaapi: Add support for decoding 8bit 4:4:4 content

[Philip Langdale]

On Fri, 29 Jul 2022 10:33:59 -0700
Philip Langdale <philipl at overt.org> wrote:

> On Sat, 23 Jul 2022 11:53:12 -0700
> Philip Langdale <philipl at overt.org> wrote:
> 
> > Recent Intel hardware is capable of decoding 8bit 4:4:4 HEVC and
> > VP9, but it uses a packed format that Microsoft wants, and which we
> > don't currently know about.
> > 
> > This patch series adds support for the AYUV format and declares
> > support in VAAPI.
> > 
> > Mark has noted that due to there never being any actual Alpha
> > produced by the hardware, we should use an XYUV format. I've not
> > done so here because libva does declare an explicit XYUV format,
> > which I assume we will see used in the future, and I didn't want to
> > fudge the formats so that they lose the nominal distinction. But
> > I'm happy to change that if desired.
> > 
> > Philip Langdale (3):
> >   lavu/pixfmt: Add packed 4:4:4 format
> >   lavu/hwcontext_vaapi: Map the AYUV format
> >   lavc/vaapi: Declare support for decoding 8bit 4:4:4 content
> > 
> >  Changelog                        |  1 +
> >  doc/APIchanges                   |  3 +++
> >  libavcodec/hevcdec.c             |  3 +++
> >  libavcodec/vaapi_decode.c        |  2 ++
> >  libavcodec/version.h             |  2 +-
> >  libavcodec/vp9.c                 |  5 +++++
> >  libavutil/hwcontext_vaapi.c      |  1 +
> >  libavutil/pixdesc.c              | 13 +++++++++++++
> >  libavutil/pixfmt.h               |  2 ++
> >  libavutil/version.h              |  4 ++--
> >  tests/ref/fate/imgutils          |  1 +
> >  tests/ref/fate/sws-pixdesc-query |  4 ++++
> >  12 files changed, 38 insertions(+), 3 deletions(-)
> >   
> 
> I will push this in the next few days if I don't get any comments or
> objections. Hai Hao confirmed in IRC that the Intel driver does
> explicitly set the alpha value to 0xFF so it is correct to treat it
> as an alpha value rather than undefined.
> 
> Thanks,
> 
> --phil

Pushed.

--phil