linux-kernel - Re: [PATCH v2 1/3] media: uapi: add WebP uAPI

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Message-Id: <D5R4DD00Z0A4.3BHMO8E5IZ6CH@cknow.org>
Date: Wed, 20 Nov 2024 16:43:12 +0100
From: "Diederik de Haas" <didi.debian@...ow.org>
To: "Hugues Fruchet" <hugues.fruchet@...s.st.com>, "Mauro Carvalho Chehab"
 <mchehab@...nel.org>, "Ezequiel Garcia" <ezequiel@...guardiasur.com.ar>,
 "Philipp Zabel" <p.zabel@...gutronix.de>, "Hans Verkuil"
 <hverkuil-cisco@...all.nl>, "Fritz Koenig" <frkoenig@...omium.org>,
 "Sebastian Fricke" <sebastian.fricke@...labora.com>, "Daniel Almeida"
 <daniel.almeida@...labora.com>, "Andrzej Pietrasiewicz"
 <andrzej.p@...labora.com>, "Nicolas Dufresne"
 <nicolas.dufresne@...labora.com>, "Benjamin Gaignard"
 <benjamin.gaignard@...labora.com>, <linux-media@...r.kernel.org>,
 <linux-kernel@...r.kernel.org>, <linux-rockchip@...ts.infradead.org>,
 <linux-stm32@...md-mailman.stormreply.com>
Subject: Re: [PATCH v2 1/3] media: uapi: add WebP uAPI

On Wed Nov 20, 2024 at 12:01 PM CET, Hugues Fruchet wrote:
> This patch adds the WebP picture decoding kernel uAPI.
>
> This design is based on currently available VP8 API implementation and
> aims to support the development of WebP stateless video codecs
> on Linux.
>
> Signed-off-by: Hugues Fruchet <hugues.fruchet@...s.st.com>
> ---
>  Documentation/userspace-api/media/v4l/biblio.rst  |  9 +++++++++
>  .../userspace-api/media/v4l/pixfmt-compressed.rst | 15 +++++++++++++++
>  drivers/media/v4l2-core/v4l2-ioctl.c              |  1 +
>  include/uapi/linux/videodev2.h                    |  1 +
>  4 files changed, 26 insertions(+)
>
> ...
>
> diff --git a/Documentation/userspace-api/media/v4l/pixfmt-compressed.rst b/Documentation/userspace-api/media/v4l/pixfmt-compressed.rst
> index 806ed73ac474..e664e70b0619 100644
> --- a/Documentation/userspace-api/media/v4l/pixfmt-compressed.rst
> +++ b/Documentation/userspace-api/media/v4l/pixfmt-compressed.rst
> @@ -169,6 +169,21 @@ Compressed Formats
>  	this pixel format. The output buffer must contain the appropriate number
>  	of macroblocks to decode a full corresponding frame to the matching
>  	capture buffer.
> +    * .. _V4L2-PIX-FMT-WEBP-FRAME:
> +
> +      - ``V4L2_PIX_FMT_WEBP_FRAME``
> +      - 'WEBP'
> +      - WEBP VP8 parsed frame, excluding WEBP RIFF header, keeping only the VP8
> +	bistream including the frame header, as extracted from the container.

s/bistream/bitstream/ ?

> +	This format is adapted for stateless video decoders that implement a
> +	WEBP pipeline with the :ref:`stateless_decoder`.
> +	Metadata associated with the frame to decode is required to be passed
> +	through the ``V4L2_CID_STATELESS_VP8_FRAME`` control.
> +	See the :ref:`associated Codec Control IDs <v4l2-codec-stateless-vp8>`.
> +	Exactly one output and one capture buffer must be provided for use with
> +	this pixel format. The output buffer must contain the appropriate number
> +	of macroblocks to decode a full corresponding frame to the matching
> +	capture buffer.
>  
>      * .. _V4L2-PIX-FMT-VP9:
>  

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