linux-kernel - Re: [PATCH] media: v4l2-ctrl: Add main 10 still picture profile for hevc

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Message-ID: <8e3a3b74-0016-8e07-fa1b-fab34014f801@xs4all.nl>
Date:   Thu, 24 Nov 2022 11:56:42 +0100
From:   Hans Verkuil <hverkuil-cisco@...all.nl>
To:     "Dikshita Agarwal (QUIC)" <quic_dikshita@...cinc.com>,
        "linux-media@...r.kernel.org" <linux-media@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "ezequiel@...labora.com" <ezequiel@...labora.com>
Cc:     "stanimir.varbanov@...aro.org" <stanimir.varbanov@...aro.org>,
        "linux-arm-msm@...r.kernel.org" <linux-arm-msm@...r.kernel.org>,
        "Vikash Garodia (QUIC)" <quic_vgarodia@...cinc.com>,
        "Maheshwar Ajja (QUIC)" <quic_majja@...cinc.com>,
        quic_jdas <quic_jdas@...cinc.com>
Subject: Re: [PATCH] media: v4l2-ctrl: Add main 10 still picture profile for
 hevc

On 26/08/2022 08:34, Dikshita Agarwal (QUIC) wrote:
> Hi Hans,
> 
> -----Original Message-----
> From: Hans Verkuil <hverkuil-cisco@...all.nl> 
> Sent: Wednesday, August 24, 2022 5:36 PM
> To: Dikshita Agarwal (QUIC) <quic_dikshita@...cinc.com>; linux-media@...r.kernel.org; linux-kernel@...r.kernel.org; ezequiel@...labora.com
> Cc: stanimir.varbanov@...aro.org; linux-arm-msm@...r.kernel.org; Vikash Garodia (QUIC) <quic_vgarodia@...cinc.com>; Maheshwar Ajja (QUIC) <quic_majja@...cinc.com>; quic_jdas <quic_jdas@...cinc.com>
> Subject: Re: [PATCH] media: v4l2-ctrl: Add main 10 still picture profile for hevc
> 
> Hi Dikshita,
> 
> On 23/08/2022 09:26, Dikshita Agarwal wrote:
>> Add main 10 still picture profile for HEVC encoder.
> 
> Hmm, is this the same as the "Main 4:4:4 Still Picture" profile mentioned here:
> 
> https://en.wikipedia.org/wiki/High_Efficiency_Video_Coding#Version_2_profiles
> 
> If not, where it is defined? I would also prefer to have this patch merged together with a driver that uses it.
> 
> It is different and definition can be found in Latest HEVC spec, Annex A, A.3.3 Main 10 and Main 10 Still Picture profiles.
> https://www.itu.int/rec/dologin_pub.asp?lang=s&id=T-REC-H.265-201906-S!!PDF-E&type=items

It will be useful to have a reference to that in the documentation.

Also note that I can't merge this without a driver that uses it!

Regards,

	Hans

> 
> Thanks,
> Dikshita
> 
> Regards,
> 
> 	Hans
> 
>>
>> Signed-off-by: Dikshita Agarwal <quic_dikshita@...cinc.com>
>> ---
>>  Documentation/userspace-api/media/v4l/ext-ctrls-codec.rst | 2 ++
>>  include/uapi/linux/v4l2-controls.h                        | 1 +
>>  2 files changed, 3 insertions(+)
>>
>> diff --git a/Documentation/userspace-api/media/v4l/ext-ctrls-codec.rst 
>> b/Documentation/userspace-api/media/v4l/ext-ctrls-codec.rst
>> index 2a165ae..5b2da84 100644
>> --- a/Documentation/userspace-api/media/v4l/ext-ctrls-codec.rst
>> +++ b/Documentation/userspace-api/media/v4l/ext-ctrls-codec.rst
>> @@ -2424,6 +2424,8 @@ enum v4l2_mpeg_video_hevc_profile -
>>        - Main still picture profile.
>>      * - ``V4L2_MPEG_VIDEO_HEVC_PROFILE_MAIN_10``
>>        - Main 10 profile.
>> +    * - ``V4L2_MPEG_VIDEO_HEVC_PROFILE_MAIN_10_STILL_PICTURE``
>> +      - Main 10 still picture profile.
>>  
>>  .. raw:: latex
>>  
>> diff --git a/include/uapi/linux/v4l2-controls.h 
>> b/include/uapi/linux/v4l2-controls.h
>> index 5f46bf4..1159337 100644
>> --- a/include/uapi/linux/v4l2-controls.h
>> +++ b/include/uapi/linux/v4l2-controls.h
>> @@ -743,6 +743,7 @@ enum v4l2_mpeg_video_hevc_profile {
>>  	V4L2_MPEG_VIDEO_HEVC_PROFILE_MAIN = 0,
>>  	V4L2_MPEG_VIDEO_HEVC_PROFILE_MAIN_STILL_PICTURE = 1,
>>  	V4L2_MPEG_VIDEO_HEVC_PROFILE_MAIN_10 = 2,
>> +	V4L2_MPEG_VIDEO_HEVC_PROFILE_MAIN_10_STILL_PICTURE = 3,
>>  };
>>  #define V4L2_CID_MPEG_VIDEO_HEVC_LEVEL		(V4L2_CID_CODEC_BASE + 616)
>>  enum v4l2_mpeg_video_hevc_level {