linux-kernel - Re: [PATCH 0/3] HDR10 static metadata

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Message-ID: <79148cf4-96dc-0c00-2864-183e526a65e9@xs4all.nl>
Date:   Tue, 10 Nov 2020 10:38:41 +0100
From:   Hans Verkuil <hverkuil-cisco@...all.nl>
To:     Nicolas Dufresne <nicolas.dufresne@...labora.com>,
        Stanimir Varbanov <stanimir.varbanov@...aro.org>,
        linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-msm@...r.kernel.org
Cc:     Ezequiel Garcia <ezequiel@...labora.com>
Subject: Re: [PATCH 0/3] HDR10 static metadata

On 09/11/2020 20:53, Nicolas Dufresne wrote:
> Le lundi 09 novembre 2020 à 19:31 +0200, Stanimir Varbanov a écrit :
>> Hello,
>>
>> This patchset adds two HDR10 HEVC v4l2 controls for Content Light Level
>> and Mastering display colour volume plus implenmentation in Venus encoder
>> driver.
>>
>> Comments are welcome!
> 
> It is not a formal review, but I did walked through the new API and
> everything looks fine to me. One question though, are you aware that
> the H.264/AVC equivalent is identical ? What is you plan for that ?

Not only that, but these structures are lifted straight from the
CTA-861-G standard: see "6.9 Dynamic Range and Mastering InfoFrame"
and "6.9.1 Static Metadata Type 1".

So this is equally useful for HDMI receivers and transmitters.

Actually, include/linux/hdmi.h contains a struct for that, but it seems
to be missing a lot of fields. But we need a v4l2 control anyway and hdmi.h
isn't a good fit for that.

Regards,

	Hans

> 
>>
>> regards,
>> Stan
>>
>> Stanimir Varbanov (3):
>>   v4l: Add HDR10 HEVC static metadata controls
>>   docs: media: Document CLL and Mastering display
>>   venus: venc: Add support for CLL and Mastering display controls
>>
>>  .../media/v4l/ext-ctrls-codec.rst             | 61 +++++++++++++++++++
>>  drivers/media/platform/qcom/venus/core.h      |  3 +
>>  drivers/media/platform/qcom/venus/hfi_cmds.c  |  8 +++
>>  .../media/platform/qcom/venus/hfi_helper.h    | 20 ++++++
>>  drivers/media/platform/qcom/venus/venc.c      | 29 +++++++++
>>  .../media/platform/qcom/venus/venc_ctrls.c    | 16 ++++-
>>  drivers/media/v4l2-core/v4l2-ctrls.c          | 61 +++++++++++++++++++
>>  include/media/hevc-ctrls.h                    | 41 +++++++++++++
>>  include/media/v4l2-ctrls.h                    |  2 +
>>  9 files changed, 240 insertions(+), 1 deletion(-)
>>
>