linux-kernel - Re: [PATCH v6 1/5] media: uapi: videodev2: Add support for AV1 stateful decoder

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Message-ID: <33fcfc82-14c9-49fb-89b7-657b7ac640a2@oss.qualcomm.com>
Date: Mon, 10 Nov 2025 09:21:41 -0800
From: Deepa Guthyappa Madivalara <deepa.madivalara@....qualcomm.com>
To: Nicolas Dufresne <nicolas.dufresne@...labora.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Vikash Garodia <vikash.garodia@....qualcomm.com>,
        Dikshita Agarwal <dikshita.agarwal@....qualcomm.com>,
        Abhinav Kumar <abhinav.kumar@...ux.dev>,
        Bryan O'Donoghue <bod@...nel.org>
Cc: linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-msm@...r.kernel.org, kernel test robot <lkp@...el.com>,
        Bryan O'Donoghue <bryan.odonoghue@...aro.org>
Subject: Re: [PATCH v6 1/5] media: uapi: videodev2: Add support for AV1
 stateful decoder


On 11/10/2025 5:59 AM, Nicolas Dufresne wrote:
> Le dimanche 09 novembre 2025 à 21:05 -0800, Deepa Guthyappa Madivalara a écrit :
>> Introduce a new pixel format, V4L2_PIX_FMT_AV1, to the
>> Video4Linux2(V4L2) API. This format is intended for AV1
>> bitstreams in stateful decoding/encoding workflows.
>> The fourcc code 'AV10' is used to distinguish
>> this format from the existing V4L2_PIX_FMT_AV1_FRAME,
>> which is used for stateless AV1 decoder implementation.
>>
>> Reviewed-by: Bryan O'Donoghue <bryan.odonoghue@...aro.org>
>> Reviewed-by: Nicolas Dufresne <nicolas.dufresne@...labora.com>
>> Signed-off-by: Deepa Guthyappa Madivalara <deepa.madivalara@....qualcomm.com>
>> ---
>>   Documentation/userspace-api/media/v4l/pixfmt-compressed.rst | 8 ++++++++
>>   include/uapi/linux/videodev2.h                              | 1 +
>>   2 files changed, 9 insertions(+)
>>
>> diff --git a/Documentation/userspace-api/media/v4l/pixfmt-compressed.rst b/Documentation/userspace-api/media/v4l/pixfmt-compressed.rst
>> index c7efb0465db6480fe35be8557728c196e0e530f4..6ca63f35b801b8aae142b69eddfaa549a5568a3f 100644
>> --- a/Documentation/userspace-api/media/v4l/pixfmt-compressed.rst
>> +++ b/Documentation/userspace-api/media/v4l/pixfmt-compressed.rst
>> @@ -275,6 +275,14 @@ Compressed Formats
>>           of macroblocks to decode a full corresponding frame to the matching
>>           capture buffer.
>>   
>> +    * .. _V4L2-PIX-FMT-AV1:
>> +
>> +      - ``V4L2_PIX_FMT_AV1``
>> +      - 'AV01'
>> +      - AV1 compressed video frame. This format is adapted for implementing AV1
>> +        pipeline. The decoder implements stateful video decoder and expects one
>> +        Temporal Unit per buffer from OBU Stream.
> This should be something like, "one temporal unit per buffer in OBU stream
> format."
>
> Nicolas
Updated in v7. Thank you.
>> +        The encoder generates one Temporal Unit per buffer.
>>   .. raw:: latex
>>   
>>       \normalsize
>> diff --git a/include/uapi/linux/videodev2.h b/include/uapi/linux/videodev2.h
>> index becd08fdbddb857f8f2bf205d2164dc6e20e80b2..cf0b71bbe0f9d397e1e6c88433a0fc3ba11fb947 100644
>> --- a/include/uapi/linux/videodev2.h
>> +++ b/include/uapi/linux/videodev2.h
>> @@ -775,6 +775,7 @@ struct v4l2_pix_format {
>>   #define V4L2_PIX_FMT_H264_SLICE v4l2_fourcc('S', '2', '6', '4') /* H264 parsed slices */
>>   #define V4L2_PIX_FMT_HEVC_SLICE v4l2_fourcc('S', '2', '6', '5') /* HEVC parsed slices */
>>   #define V4L2_PIX_FMT_AV1_FRAME v4l2_fourcc('A', 'V', '1', 'F') /* AV1 parsed frame */
>> +#define V4L2_PIX_FMT_AV1      v4l2_fourcc('A', 'V', '0', '1') /* AV1 */
>>   #define V4L2_PIX_FMT_SPK      v4l2_fourcc('S', 'P', 'K', '0') /* Sorenson Spark */
>>   #define V4L2_PIX_FMT_RV30     v4l2_fourcc('R', 'V', '3', '0') /* RealVideo 8 */
>>   #define V4L2_PIX_FMT_RV40     v4l2_fourcc('R', 'V', '4', '0') /* RealVideo 9 & 10 */