linux-kernel - Re: [PATCH v4 13/13] media: docs: Move the H264 stateless codec uAPI

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Date:   Wed, 25 Nov 2020 11:37:53 +0100
From:   Hans Verkuil <hverkuil@...all.nl>
To:     Ezequiel Garcia <ezequiel@...labora.com>,
        linux-media@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     kernel@...labora.com, Jonas Karlman <jonas@...boo.se>,
        Nicolas Dufresne <nicolas.dufresne@...labora.com>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Maxime Ripard <mripard@...nel.org>,
        Paul Kocialkowski <paul.kocialkowski@...tlin.com>,
        Jernej Skrabec <jernej.skrabec@...l.net>
Subject: Re: [PATCH v4 13/13] media: docs: Move the H264 stateless codec uAPI

On 23/11/2020 15:40, Ezequiel Garcia wrote:
> Now that we've destaged the H264 stateless codec controls,
> and with all the pieces in place, update the documentation
> and move it to its own section.
> 
> Signed-off-by: Ezequiel Garcia <ezequiel@...labora.com>
> ---
>  .../userspace-api/media/v4l/common.rst        |   1 +
>  .../media/v4l/ext-ctrls-codec-stateless.rst   | 674 +++++++++++++++++
>  .../media/v4l/ext-ctrls-codec.rst             | 692 ------------------
>  .../media/v4l/extended-controls.rst           |   3 +-
>  .../media/v4l/pixfmt-compressed.rst           |  21 +-
>  5 files changed, 685 insertions(+), 706 deletions(-)
>  create mode 100644 Documentation/userspace-api/media/v4l/ext-ctrls-codec-stateless.rst
> 

<snip>

> diff --git a/Documentation/userspace-api/media/v4l/extended-controls.rst b/Documentation/userspace-api/media/v4l/extended-controls.rst
> index 44fcd67f20bf..866bd787eef0 100644
> --- a/Documentation/userspace-api/media/v4l/extended-controls.rst
> +++ b/Documentation/userspace-api/media/v4l/extended-controls.rst
> @@ -56,7 +56,8 @@ group similar controls into a single class. For example, control class
>  ``V4L2_CTRL_CLASS_USER`` contains all user controls (i. e. all controls
>  that can also be set using the old :ref:`VIDIOC_S_CTRL <VIDIOC_G_CTRL>`
>  ioctl). Control class ``V4L2_CTRL_CLASS_CODEC`` contains controls
> -relating to codecs.
> +relating to codecs. See :ref:`codec-stateless-controls` for controls
> +specific to stateless codecs.

Drop this change. This text just gives an example about how control classes
work, it's not codec documentation as such.

Regards,

	Hans

>  
>  All controls in the control array must belong to the specified control
>  class. An error is returned if this is not the case.
> diff --git a/Documentation/userspace-api/media/v4l/pixfmt-compressed.rst b/Documentation/userspace-api/media/v4l/pixfmt-compressed.rst
> index d585909bc4e2..e28749ebf8d8 100644
> --- a/Documentation/userspace-api/media/v4l/pixfmt-compressed.rst
> +++ b/Documentation/userspace-api/media/v4l/pixfmt-compressed.rst
> @@ -57,16 +57,16 @@ Compressed Formats
>        - H264 parsed slice data, including slice headers, either with or
>  	without the start code, as extracted from the H264 bitstream.
>  	This format is adapted for stateless video decoders that implement an
> -	H264 pipeline (using the :ref:`mem2mem` and :ref:`media-request-api`).
> +	H264 pipeline with the :ref:`stateless_decoder`.
>  	This pixelformat has two modifiers that must be set at least once
> -	through the ``V4L2_CID_MPEG_VIDEO_H264_DECODE_MODE``
> -        and ``V4L2_CID_MPEG_VIDEO_H264_START_CODE`` controls.
> +	through the ``V4L2_CID_STATELESS_H264_DECODE_MODE``
> +        and ``V4L2_CID_STATELESS_H264_START_CODE`` controls.
>  	In addition, metadata associated with the frame to decode are
> -	required to be passed through the ``V4L2_CID_MPEG_VIDEO_H264_SPS``,
> -	``V4L2_CID_MPEG_VIDEO_H264_PPS``,
> -	``V4L2_CID_MPEG_VIDEO_H264_SCALING_MATRIX``,
> -	``V4L2_CID_MPEG_VIDEO_H264_SLICE_PARAMS`` and
> -	``V4L2_CID_MPEG_VIDEO_H264_DECODE_PARAMS`` controls.  See the
> +	required to be passed through the ``V4L2_CID_STATELESS_H264_SPS``,
> +	``V4L2_CID_STATELESS_H264_PPS``,
> +	``V4L2_CID_STATELESS_H264_SCALING_MATRIX``,
> +	``V4L2_CID_STATELESS_H264_SLICE_PARAMS`` and
> +	``V4L2_CID_STATELESS_H264_DECODE_PARAMS`` controls.  See the
>  	:ref:`associated Codec Control IDs <v4l2-mpeg-h264>`.  Exactly
>  	one output and one capture buffer must be provided for use
>  	with this pixel format. The output buffer must contain the
> @@ -77,11 +77,6 @@ Compressed Formats
>  	7.3.2.8 "Slice layer without partitioning RBSP syntax" and the following
>  	sections.
>  
> -	.. note::
> -
> -	   This format is not yet part of the public kernel API and it
> -	   is expected to change.
> -
>      * .. _V4L2-PIX-FMT-H263:
>  
>        - ``V4L2_PIX_FMT_H263``
>