[FFmpeg-devel] Let us review and collebrate on vvc native decoder.

[FFmpeg-devel] Let us review and collebrate on vvc native decoder.

[Nuo Mi]

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Hi Experts:
I am happy to send out the first draft of vvc decoder.
It's not ready for upstream yet, but it's a good base ground for review and
future improvement.

It has the following features:
* C only
+ Fast. On a 4 cores laptop, it can get 30~35+ fps for 10bits 1080P.
+ Support traditional features I, P B frames, 8/10 bits, chroma 400,420,
422, and 444,
+ Support VVC new tools like MIP, CCLM, AFFINE, GPM, DMVR, PROF, BDOF,
LMCS, ALF
-  Not support RPR, PCM, IBC, PALETTE, and other minor features yet.

Please help review the attached patch and provide your valuable comment.
I also created a GitHub repo https://github.com/ffvvc/FFmpeg to
collaborate. Any improvement or issue report is welcomed.

Thank you.

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Re: [FFmpeg-devel] Let us review and collebrate on vvc native decoder.

[Nuo Mi]

On Sat, Jan 14, 2023 at 9:13 PM Nuo Mi <nuomi2021@gmail.com> wrote:

> Hi Experts:
> I am happy to send out the first draft of vvc decoder.
> It's not ready for upstream yet, but it's a good base ground for review
> and future improvement.
>
> It has the following features:
> * C only
> + Fast. On a 4 cores laptop, it can get 30~35+ fps for 10bits 1080P.
> + Support traditional features I, P B frames, 8/10 bits, chroma 400,420,
> 422, and 444,
> + Support VVC new tools like MIP, CCLM, AFFINE, GPM, DMVR, PROF, BDOF,
> LMCS, ALF
> -  Not support RPR, PCM, IBC, PALETTE, and other minor features yet.
>
> Please help review the attached patch and provide your valuable comment.
> I also created a GitHub repo https://github.com/ffvvc/FFmpeg to
> collaborate. Any improvement or issue report is welcomed.
>
> Thank you.
>
>
>
>
Hmm, the patch is too large, and blocked by the system.

Hi list moderators,
Please kindly help to unblock it.

Hi all,
If you want a quick preview please visit
https://github.com/ffvvc/FFmpeg/commit/3cb136dc5fc70d65f9918453a842439323e81908

Thank you
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Re: [FFmpeg-devel] Let us review and collebrate on vvc native decoder.

[Paul B Mahol]

On 1/14/23, Nuo Mi <nuomi2021@gmail.com> wrote:
> On Sat, Jan 14, 2023 at 9:13 PM Nuo Mi <nuomi2021@gmail.com> wrote:
>
>> Hi Experts:
>> I am happy to send out the first draft of vvc decoder.
>> It's not ready for upstream yet, but it's a good base ground for review
>> and future improvement.
>>
>> It has the following features:
>> * C only
>> + Fast. On a 4 cores laptop, it can get 30~35+ fps for 10bits 1080P.
>> + Support traditional features I, P B frames, 8/10 bits, chroma 400,420,
>> 422, and 444,
>> + Support VVC new tools like MIP, CCLM, AFFINE, GPM, DMVR, PROF, BDOF,
>> LMCS, ALF
>> -  Not support RPR, PCM, IBC, PALETTE, and other minor features yet.
>>
>> Please help review the attached patch and provide your valuable comment.
>> I also created a GitHub repo https://github.com/ffvvc/FFmpeg to
>> collaborate. Any improvement or issue report is welcomed.
>>
>> Thank you.
>>
>>
>>
>>
> Hmm, the patch is too large, and blocked by the system.
>
> Hi list moderators,
> Please kindly help to unblock it.
>
> Hi all,
> If you want a quick preview please visit
> https://github.com/ffvvc/FFmpeg/commit/3cb136dc5fc70d65f9918453a842439323e81908
>

It can be reviewed from github too.

> Thank you
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> ffmpeg-devel@ffmpeg.org
> https://ffmpeg.org/mailman/listinfo/ffmpeg-devel
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> ffmpeg-devel-request@ffmpeg.org with subject "unsubscribe".
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Re: [FFmpeg-devel] Let us review and collebrate on vvc native decoder.

[Nuo Mi]

On Sat, Jan 14, 2023 at 9:53 PM Paul B Mahol <onemda@gmail.com> wrote:

> On 1/14/23, Nuo Mi <nuomi2021@gmail.com> wrote:
> > On Sat, Jan 14, 2023 at 9:13 PM Nuo Mi <nuomi2021@gmail.com> wrote:
> >
> >> Hi Experts:
> >> I am happy to send out the first draft of vvc decoder.
> >> It's not ready for upstream yet, but it's a good base ground for review
> >> and future improvement.
> >>
> >> It has the following features:
> >> * C only
> >> + Fast. On a 4 cores laptop, it can get 30~35+ fps for 10bits 1080P.
> >> + Support traditional features I, P B frames, 8/10 bits, chroma 400,420,
> >> 422, and 444,
> >> + Support VVC new tools like MIP, CCLM, AFFINE, GPM, DMVR, PROF, BDOF,
> >> LMCS, ALF
> >> -  Not support RPR, PCM, IBC, PALETTE, and other minor features yet.
> >>
> >> Please help review the attached patch and provide your valuable comment.
> >> I also created a GitHub repo https://github.com/ffvvc/FFmpeg to
> >> collaborate. Any improvement or issue report is welcomed.
> >>
> >> Thank you.
> >>
> >>
> >>
> >>
> > Hmm, the patch is too large, and blocked by the system.
> >
> > Hi list moderators,
> > Please kindly help to unblock it.
> >
> > Hi all,
> > If you want a quick preview please visit
> >
> https://github.com/ffvvc/FFmpeg/commit/3cb136dc5fc70d65f9918453a842439323e81908
> >
>
> It can be reviewed from github too.
>
Some people hate github.  Obvious you are not one of them :)

>
> > Thank you
> > _______________________________________________
> > ffmpeg-devel mailing list
> > ffmpeg-devel@ffmpeg.org
> > https://ffmpeg.org/mailman/listinfo/ffmpeg-devel
> >
> > To unsubscribe, visit link above, or email
> > ffmpeg-devel-request@ffmpeg.org with subject "unsubscribe".
> >
> _______________________________________________
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>
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Re: [FFmpeg-devel] Let us review and collebrate on vvc native decoder.

[Ronald S. Bultje]

Hi,

On Sat, Jan 14, 2023 at 8:32 AM Nuo Mi <nuomi2021@gmail.com> wrote:

> On Sat, Jan 14, 2023 at 9:13 PM Nuo Mi <nuomi2021@gmail.com> wrote:
> > I am happy to send out the first draft of vvc decoder.
> > It's not ready for upstream yet, but it's a good base ground for review
> > and future improvement.
> >
> > It has the following features:
> > * C only
> > + Fast. On a 4 cores laptop, it can get 30~35+ fps for 10bits 1080P.
> > + Support traditional features I, P B frames, 8/10 bits, chroma 400,420,
> > 422, and 444,
> > + Support VVC new tools like MIP, CCLM, AFFINE, GPM, DMVR, PROF, BDOF,
> > LMCS, ALF
> > -  Not support RPR, PCM, IBC, PALETTE, and other minor features yet.
> >
> > Please help review the attached patch and provide your valuable comment.
>

The custom threading framework (Executor, Task) - can you elaborate on this
further? If this is meant to be used outside (since it lacks VVC prefix),
it should be properly namespaced (FF, AV). It seems like you're trying to
combine row/col/frame threading from vvc_thread.c. These (frame, col/row)
are fairly common in FFmpeg and there already is existing API for that
(although you can't combine them; ask kurosu who IIRC has a private branch
doing this for hevc :-) ). This probably needs some further discussion
depending on what the rest of the community wants. Right now, this adds VVC
private functionality to enable combination of "slice" (row/col) and
"frame" threading, which other codecs wouldn't have. This is probably not a
desirable end state.

Some functions contain av_assert calls, e.g. chroma_mc_bi or
get_luma_weight. Are these not yet implemented or impossible because of
bitstream coding constraints? If former, please use
avpriv_report_missing_feature() so the user is informed of the incomplete
decoding. If the latter, please add a comment and remove #if 0 code. For
other cases of missing features (e.g. PCM), don't silently return 0, but
use avpriv_report_missing_feature() so the user is informed.

How come vvcdsp has only 8/10 bits/component code but vvcpred has 8/9/10/12
bits/component code?

Not a lot of comments other than references to the spec...

Is any of the code (e.g. tools such as sao dsp) shareable with HEVC? This
would reduce the total implementation requirement for arch-specific code.

Ronald
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Re: [FFmpeg-devel] Let us review and collebrate on vvc native decoder.

[Nuo Mi]

Hi Ronald,
Thank you for the detailed comment. You read code really quickly.

On Sat, Jan 14, 2023 at 10:28 PM Ronald S. Bultje <rsbultje@gmail.com>
wrote:

> Hi,
>
> On Sat, Jan 14, 2023 at 8:32 AM Nuo Mi <nuomi2021@gmail.com> wrote:
>
> > On Sat, Jan 14, 2023 at 9:13 PM Nuo Mi <nuomi2021@gmail.com> wrote:
> > > I am happy to send out the first draft of vvc decoder.
> > > It's not ready for upstream yet, but it's a good base ground for review
> > > and future improvement.
> > >
> > > It has the following features:
> > > * C only
> > > + Fast. On a 4 cores laptop, it can get 30~35+ fps for 10bits 1080P.
> > > + Support traditional features I, P B frames, 8/10 bits, chroma
> 400,420,
> > > 422, and 444,
> > > + Support VVC new tools like MIP, CCLM, AFFINE, GPM, DMVR, PROF, BDOF,
> > > LMCS, ALF
> > > -  Not support RPR, PCM, IBC, PALETTE, and other minor features yet.
> > >
> > > Please help review the attached patch and provide your valuable
> comment.
> >
>
> The custom threading framework (Executor, Task) - can you elaborate on this
> further? If this is meant to be used outside (since it lacks VVC prefix),
> it should be properly namespaced (FF, AV). It seems like you're trying to
> combine row/col/frame threading from vvc_thread.c. These (frame, col/row)
> are fairly common in FFmpeg and there already is existing API for that
> (although you can't combine them; ask kurosu who IIRC has a private branch
> doing this for hevc :-) ). This probably needs some further discussion
> depending on what the rest of the community wants. Right now, this adds VVC
> private functionality to enable combination of "slice" (row/col) and
> "frame" threading, which other codecs wouldn't have. This is probably not a
> desirable end state.
>

Yes. It can be used by other codecs or even filters too. The task
allocation, and the task readiness check
delegate to the caller. so It gets more flexible from the caller's or
executor's view.
When I read the hevc code it was a little surprise to me since it can't
combine frame and slice threading.
I guess it will impact the fps, but I do not have time to provide it.
I will check with kurosu offline, It's better to have a unified solution
for hevc and vvc. I can follow him if the api can do frame + slice/CTU
multi-thread.


> Some functions contain av_assert calls, e.g. chroma_mc_bi or
> get_luma_weight. Are these not yet implemented or impossible because of
> bitstream coding constraints? If former, please use
> avpriv_report_missing_feature() so the user is informed of the incomplete
> decoding. If the latter, please add a comment and remove #if 0 code. For
> other cases of missing features (e.g. PCM), don't silently return 0, but
> use avpriv_report_missing_feature() so the user is informed.
>

Yes. weight prediction and  PCM are missing features, it's listed at
https://github.com/ffvvc/FFmpeg/issues.
 I or some kindly contributor will implement it before we upstream it.
Thank you for your suggestion, if we can't fix it before upstream, I will
use avpriv_report_missing_feature()


> How come vvcdsp has only 8/10 bits/component code but vvcpred has 8/9/10/12
> bits/component code?
>

I will remove it.


> Not a lot of comments other than references to the spec...
>
Before I send out the patch, it's like walking in a dark tunnel. I try my
best to get to another side.
Not have so much time to polish things. I will add more comments and do
some react to make the code more readable.


> Is any of the code (e.g. tools such as sao dsp) shareable with HEVC? This
> would reduce the total implementation requirement for arch-specific code.
>

SAO can be fully reused, most inter predict code can be reused, and some
parts of intra-predict and deblocking can be reused..
I will create a full list at the github repo.

>
> Ronald
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Re: [FFmpeg-devel] Let us review and collebrate on vvc native decoder.

[Ronald S. Bultje]

Hi,

On Sat, Jan 14, 2023 at 10:16 AM Nuo Mi <nuomi2021@gmail.com> wrote:

> On Sat, Jan 14, 2023 at 10:28 PM Ronald S. Bultje <rsbultje@gmail.com>
> > How come vvcdsp has only 8/10 bits/component code but vvcpred has
> 8/9/10/12
> > bits/component code?
>
> I will remove it.
>

Not sure how applicable this is, but for AV1 (dav1d), most high-bitdepth
(non-8 bits/component) code has the same container type requirements (e.g.
"fits in int16_t"), so we add a "limit" (analogous "bitdepth") argument to
relevant functions and then only have to implement it once for all non-8
bits/component implementations. This is different from *_template.c
versions, because the binary size is actually significantly reduced. A
further advantage is that implementing hand-written arch-specific
implementations (asm) for one higher bitdepth automatically works for all.
Best of all: there's no runtime penalty. Maybe you want to consider that
for vvc also. (It's probably too late to fix ffh264/hevc/vp9.)

I can elaborate further if you're interested (maybe IRC?). The more complex
the codec gets (vvc > hevc > h264 > mpeg, and av1 > vp9 > vp8), the higher
the (binary) codesize gains from such an implementation choice. FFmpeg is
already huge so it's worth trying to trim its fat a bit.

Ronald
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Re: [FFmpeg-devel] Let us review and collebrate on vvc native decoder.

[Nuo Mi]

On Sat, Jan 14, 2023 at 11:52 PM Ronald S. Bultje <rsbultje@gmail.com>
wrote:

> Hi,
>
> On Sat, Jan 14, 2023 at 10:16 AM Nuo Mi <nuomi2021@gmail.com> wrote:
>
> > On Sat, Jan 14, 2023 at 10:28 PM Ronald S. Bultje <rsbultje@gmail.com>
> > > How come vvcdsp has only 8/10 bits/component code but vvcpred has
> > 8/9/10/12
> > > bits/component code?
> >
> > I will remove it.
> >
>
> Not sure how applicable this is, but for AV1 (dav1d), most high-bitdepth
> (non-8 bits/component) code has the same container type requirements (e.g.
> "fits in int16_t"), so we add a "limit" (analogous "bitdepth") argument to
> relevant functions and then only have to implement it once for all non-8
> bits/component implementations. This is different from *_template.c
> versions, because the binary size is actually significantly reduced. A
> further advantage is that implementing hand-written arch-specific
> implementations (asm) for one higher bitdepth automatically works for all.
> Best of all: there's no runtime penalty. Maybe you want to consider that
> for vvc also. (It's probably too late to fix ffh264/hevc/vp9.)
>
> I can elaborate further if you're interested (maybe IRC?). The more complex
> the codec gets (vvc > hevc > h264 > mpeg, and av1 > vp9 > vp8), the higher
> the (binary) codesize gains from such an implementation choice. FFmpeg is
> already huge so it's worth trying to trim its fat a bit.
>
> Ronald
> _______________________________________________
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> ffmpeg-devel@ffmpeg.org
> https://ffmpeg.org/mailman/listinfo/ffmpeg-devel
>
> To unsubscribe, visit link above, or email
> ffmpeg-devel-request@ffmpeg.org with subject "unsubscribe".
>
Hi Ronald,
It's hard to find a main 12 or main 16 clips now.  But it's a very
good suggestion.
Will ping you on IRC after I read the da1vd code and do some feasibility
analysis.
Record it as https://github.com/ffvvc/FFmpeg/issues/14 in case I missed it.
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Re: [FFmpeg-devel] Let us review and collebrate on vvc native decoder.

[Nuo Mi]

On Sat, Jan 14, 2023 at 11:52 PM Ronald S. Bultje <rsbultje@gmail.com>
wrote:

> Hi,
>
> On Sat, Jan 14, 2023 at 10:16 AM Nuo Mi <nuomi2021@gmail.com> wrote:
>
> > On Sat, Jan 14, 2023 at 10:28 PM Ronald S. Bultje <rsbultje@gmail.com>
> > > How come vvcdsp has only 8/10 bits/component code but vvcpred has
> > 8/9/10/12
> > > bits/component code?
> >
> > I will remove it.
> >
>
> Not sure how applicable this is, but for AV1 (dav1d), most high-bitdepth
> (non-8 bits/component) code has the same container type requirements (e.g.
> "fits in int16_t"), so we add a "limit" (analogous "bitdepth") argument to
> relevant functions and then only have to implement it once for all non-8
> bits/component implementations. This is different from *_template.c
> versions, because the binary size is actually significantly reduced. A
> further advantage is that implementing hand-written arch-specific
> implementations (asm) for one higher bitdepth automatically works for all.
> Best of all: there's no runtime penalty. Maybe you want to consider that
> for vvc also. (It's probably too late to fix ffh264/hevc/vp9.)
>

Hi Ronald,
Before I go too far, could you help me review the current code? I hope the
direction is right.
https://github.com/ffvvc/FFmpeg/pull/35

I am adding highbd functions under the dsp functions. This will avoid
bytefn propagating to callers.
Current dav1d has 16 bytefn, some are really big, I guess it will double
the code size for these functions.


>
> I can elaborate further if you're interested (maybe IRC?). The more complex
> the codec gets (vvc > hevc > h264 > mpeg, and av1 > vp9 > vp8), the higher
> the (binary) codesize gains from such an implementation choice. FFmpeg is
> already huge so it's worth trying to trim its fat a bit.
>
> Ronald
> _______________________________________________
> ffmpeg-devel mailing list
> ffmpeg-devel@ffmpeg.org
> https://ffmpeg.org/mailman/listinfo/ffmpeg-devel
>
> To unsubscribe, visit link above, or email
> ffmpeg-devel-request@ffmpeg.org with subject "unsubscribe".
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Re: [FFmpeg-devel] Let us review and collebrate on vvc native decoder.

[Thilo Borgmann]

Am 14.01.23 um 14:32 schrieb Nuo Mi:
> On Sat, Jan 14, 2023 at 9:13 PM Nuo Mi <nuomi2021@gmail.com> wrote:
> 
>> Hi Experts:
>> I am happy to send out the first draft of vvc decoder.
>> It's not ready for upstream yet, but it's a good base ground for review
>> and future improvement.
>>
>> It has the following features:
>> * C only
>> + Fast. On a 4 cores laptop, it can get 30~35+ fps for 10bits 1080P.
>> + Support traditional features I, P B frames, 8/10 bits, chroma 400,420,
>> 422, and 444,
>> + Support VVC new tools like MIP, CCLM, AFFINE, GPM, DMVR, PROF, BDOF,
>> LMCS, ALF
>> -  Not support RPR, PCM, IBC, PALETTE, and other minor features yet.
>>
>> Please help review the attached patch and provide your valuable comment.
>> I also created a GitHub repo https://github.com/ffvvc/FFmpeg to
>> collaborate. Any improvement or issue report is welcomed.
>>
>> Thank you.
>>
>>
>>
>>
> Hmm, the patch is too large, and blocked by the system.
> 
> Hi list moderators,
> Please kindly help to unblock it.

I just let that mail pass for getting more people looking at it.
For the next iteration, this should most likely be a patchset avoiding the problem.


> Hi all,
> If you want a quick preview please visit
> https://github.com/ffvvc/FFmpeg/commit/3cb136dc5fc70d65f9918453a842439323e81908
> 
> Thank you

-Thilo

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Re: [FFmpeg-devel] Let us review and collebrate on vvc native decoder.

[Nuo Mi]

On Thu, Jan 26, 2023 at 8:23 PM Thilo Borgmann <thilo.borgmann@mail.de>
wrote:

> Am 14.01.23 um 14:32 schrieb Nuo Mi:
> > On Sat, Jan 14, 2023 at 9:13 PM Nuo Mi <nuomi2021@gmail.com> wrote:
> >
> >> Hi Experts:
> >> I am happy to send out the first draft of vvc decoder.
> >> It's not ready for upstream yet, but it's a good base ground for review
> >> and future improvement.
> >>
> >> It has the following features:
> >> * C only
> >> + Fast. On a 4 cores laptop, it can get 30~35+ fps for 10bits 1080P.
> >> + Support traditional features I, P B frames, 8/10 bits, chroma 400,420,
> >> 422, and 444,
> >> + Support VVC new tools like MIP, CCLM, AFFINE, GPM, DMVR, PROF, BDOF,
> >> LMCS, ALF
> >> -  Not support RPR, PCM, IBC, PALETTE, and other minor features yet.
> >>
> >> Please help review the attached patch and provide your valuable comment.
> >> I also created a GitHub repo https://github.com/ffvvc/FFmpeg to
> >> collaborate. Any improvement or issue report is welcomed.
> >>
> >> Thank you.
> >>
> >>
> >>
> >>
> > Hmm, the patch is too large, and blocked by the system.
> >
> > Hi list moderators,
> > Please kindly help to unblock it.
>
> I just let that mail pass for getting more people looking at it.
> For the next iteration, this should most likely be a patchset avoiding the
> problem.
>
>
> > Hi all,
> > If you want a quick preview please visit
> >
> https://github.com/ffvvc/FFmpeg/commit/3cb136dc5fc70d65f9918453a842439323e81908
> >
> > Thank you
>
> -Thilo
>
> _______________________________________________
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> ffmpeg-devel@ffmpeg.org
> https://ffmpeg.org/mailman/listinfo/ffmpeg-devel
>
> To unsubscribe, visit link above, or email
> ffmpeg-devel-request@ffmpeg.org with subject "unsubscribe".
>

sure, I will send patchset next time.
Thank you Thilo, you are always so kind and helpful.
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