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

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Message-ID: <6b4f23be-060c-db6f-2fb5-e4d328789990@xs4all.nl>
Date:   Tue, 10 Nov 2020 10:41:44 +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 10/11/2020 10:38, Hans Verkuil wrote:
> 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".

Correction: the CTA-861-G lifted it from SMPTE ST-2086 in turn.

Regards,

	Hans

> 
> 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(-)
>>>
>>
>