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SubjectRe: Re: [PATCH v3] media: cedrus: Add support for VP8 decoding
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On Fri, 2020-11-27 at 00:40 +0100, Jernej Škrabec wrote:
> Hi!
>
> Dne petek, 27. november 2020 ob 00:21:11 CET je Ezequiel Garcia napisal(a):
> > Hi Jernej, Emmanuel,
> >
> > Thanks for the patch.
> >
> > On Tue, 2020-11-10 at 23:35 +0100, Jernej Skrabec wrote:
> > > VP8 in Cedrus shares same engine as H264.
> > >
> > > Note that it seems necessary to call bitstream parsing functions,
> > > to parse frame header, otherwise decoded image is garbage. This is
> > > contrary to what is driver supposed to do. However, values are not
> > > really used, so this might be acceptable. It's possible that bitstream
> > > parsing functions set some internal VPU state, which is later necessary
> > > for proper decoding. Biggest suspect is "VP8 probs update" trigger.
> > >
> > > Signed-off-by: Jernej Skrabec <jernej.skrabec@siol.net>
> > > [addressed issues from reviewer]
> > > Signed-off-by: Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
> > > ---
> > > Changes in v3:
> > > - addressed comments from Ezequiel Garcia - new comments,
> > > using new macros from VP8 UAPI, new function for waiting
> > > on bit to be set
> > > Changes in v2:
> > > - rebased on top of current linux-media master branch
> > >
> > > NOTE: This now depends on following patch:
> > > https://patchwork.linuxtv.org/project/linux-media/patch/
> 20201108202021.4187-1-linkmauve@linkmauve.fr/
> >
> > The patch looks fairly good, so let's wait and see
> > what Hans, Paul and Maxime think about it.
> >
> > FWIW, my humble Reviewed-by: Ezequiel Garcia <ezequiel@collabora.com>
>
> Thanks!
>
> > It would be good to make sure this doesn't regress
> > v4l2-compliance, or cause some regression in decoding.
>
> I didn't include v4l2-compliance here, but it was in previous revisions. This
> revision has just cosmetics. Not sure how it could cause any regression since
> it's pretty standalone.
>

Yes, indeed.

> > Not really a blocker to merge this, but I'm thinking
> > that now that we have Fluster for conformance testing,
> > we could add the VP8 vectors and use them against
> > Cedrus and Hantro:
> >
> > https://chromium.googlesource.com/webm/vp8-test-vectors/+/refs/heads/master
>
> I tested VP8 test vectors with initial version of this decoder by hand and all
> videos were properly decoded as far as I can tell. But automated testing is
> always welcome.
>

More the reason to consider this safe to merge!

Thanks,
Ezequiel

> Best regards,
> Jernej
>
> > Thanks,
> > Ezequiel
> >
> > > drivers/staging/media/sunxi/cedrus/Makefile | 3 +-
> > > drivers/staging/media/sunxi/cedrus/cedrus.c | 8 +
> > > drivers/staging/media/sunxi/cedrus/cedrus.h | 24 +
> > > .../staging/media/sunxi/cedrus/cedrus_dec.c | 5 +
> > > .../staging/media/sunxi/cedrus/cedrus_hw.c | 2 +
> > > .../staging/media/sunxi/cedrus/cedrus_regs.h | 80 ++
> > > .../staging/media/sunxi/cedrus/cedrus_video.c | 9 +
> > > .../staging/media/sunxi/cedrus/cedrus_vp8.c | 907 ++++++++++++++++++
> > > 8 files changed, 1037 insertions(+), 1 deletion(-)
> > > create mode 100644 drivers/staging/media/sunxi/cedrus/cedrus_vp8.c
> > >
>
>


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