linux-kernel - Re: Re: [PATCH v2 0/4] media: HEVC: RPS clean up

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Date:   Tue, 12 Oct 2021 18:08:48 +0200
From:   Jernej Škrabec <jernej.skrabec@...il.com>
To:     mchehab@...nel.org, p.zabel@...gutronix.de,
        gregkh@...uxfoundation.org, mripard@...nel.org,
        paul.kocialkowski@...tlin.com, wens@...e.org,
        hverkuil-cisco@...all.nl, jc@...esim.co.uk,
        ezequiel@...guardiasur.com.ar,
        Benjamin Gaignard <benjamin.gaignard@...labora.com>
Cc:     linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-rockchip@...ts.infradead.org, linux-staging@...ts.linux.dev,
        linux-arm-kernel@...ts.infradead.org, linux-sunxi@...ts.linux.dev
Subject: Re: Re: [PATCH v2 0/4] media: HEVC: RPS clean up

CC: Alex Bee

Alex, please take a look to these patches too.

Dne torek, 12. oktober 2021 ob 17:57:50 CEST je Benjamin Gaignard napisal(a):
> 
> Le 12/10/2021 à 17:34, Jernej Škrabec a écrit :
> > Hi Benjamin!
> >
> > Dne torek, 12. oktober 2021 ob 16:35:48 CEST je Benjamin Gaignard 
napisal(a):
> >> This series aims to clean up Reference Picture Set usage and flags.
> >>
> >> Long term flag was named with RPS prefix while it is not used for RPS
> >> but for mark long term references in DBP. Remane it and remove the two
> >> other useless RPS flags.
> >>
> >> Clarify documentation about RPS lists content and make sure that Hantro
> >> driver use them correctly (i.e without look up in DBP).
> >>
> >> These patches are the last in my backlog impacting HEVC uAPI.
> >>  From my point of view, once they get merged, you could start talking
> >> about how move HEVC uAPI to stable.
> > With your changes, HEVC uAPI controls still won't be complete. Cedrus 
needs
> > entry point control, which in turn needs dynamic array support. I'm a bit 
lazy
> > implementing that control, but I guess I can take a look in a month or so.
> > rkvdec also needs more fields for HEVC. With patches collected here:
> > https://github.com/LibreELEC/LibreELEC.tv/blob/master/projects/Rockchip/
> > patches/linux/default/linux-2001-v4l-wip-rkvdec-hevc.patch
> > fluster HEVC test score is reportedly 121/135 (8-bit tests only).
> 
> Hi Jernej,
> 
> Thanks for your feedback, getting a list of missing items in HEVC uAPI
> will definitively help to fill the hope.
> The patch you mention for rkvdec are already merged in mainline kernel (at
> least for uAPI part).

Are they? What about:
video_parameter_set_id
seq_parameter_set_id
pic_parameter_set_id
short_term_ref_pic_set_size
long_term_ref_pic_set_size

At least I don't see them in linux-next. Maybe that information can be 
obtained in some other way?

> Cedrus needs are about num_entry_point_offsets, offset_len_minus1 and 
entry_point_offset_minus1[ i ]
> in HEVC specifications ?

Yes, Cedrus needs to know whole list of entry points. I don't think we need to 
worry about offset_len_minus1, list could be pre-processed - just number of 
entry points and their values.

Best regards,
Jernej

> 
> Regards,
> Benjamin
> 
> >
> > I would certainly wait with moving HEVC uAPI to stable.
> >
> > Best regards,
> > Jernej
> >
> >> version 2:
> >> - change DPB field name from rps to flags
> >>
> >> Please note that the only purpose of commits 3 and 4 is to allow to test
> >> G2 hardware block for IMX8MQ until a proper solution isuing power domain
> >> can be found. Do not merge them.
> >>
> >> GStreamer HEVC plugin merge request can be found here:
> >> https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/1079
> >>
> >> With those piece of code fluster score is 77/147.
> >>
> >> Benjamin
> >>
> >> Benjamin Gaignard (4):
> >>    media: hevc: Remove RPS named flags
> >>    media: hevc: Embedded indexes in RPS
> >>    media: hantro: Use syscon instead of 'ctrl' register
> >>    arm64: dts: imx8mq: Add node to G2 hardware
> >>
> >>   .../media/v4l/ext-ctrls-codec.rst             | 14 +++---
> >>   arch/arm64/boot/dts/freescale/imx8mq.dtsi     | 43 +++++++++++++----
> >>   drivers/staging/media/hantro/hantro.h         |  5 +-
> >>   .../staging/media/hantro/hantro_g2_hevc_dec.c | 27 +++--------
> >>   drivers/staging/media/hantro/imx8m_vpu_hw.c   | 48 ++++++++++++-------
> >>   .../staging/media/sunxi/cedrus/cedrus_h265.c  |  2 +-
> >>   include/media/hevc-ctrls.h                    |  6 +--
> >>   7 files changed, 84 insertions(+), 61 deletions(-)
> >>
> >> -- 
> >> 2.30.2
> >>
> >>
> >
>