linux-kernel - Re: [PATCH v2 2/2] media: v4l: Add H265 pixel format

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Message-ID: <164966476674.22830.512211103923160119@Monstersaurus>
Date:   Mon, 11 Apr 2022 09:12:46 +0100
From:   Kieran Bingham <kieran.bingham@...asonboard.com>
To:     James_Lin <Ping-lei.Lin@...iatek.com>, linux-kernel@...r.kernel.org
Cc:     Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Hans Verkuil <hverkuil-cisco@...all.nl>,
        Ezequiel Garcia <ezequiel@...guardiasur.com.ar>,
        Arnd Bergmann <arnd@...db.de>,
        Ricardo Ribalda <ribalda@...omium.org>,
        Ming Qian <ming.qian@....com>,
        Andrzej Pietrasiewicz <andrzej.p@...labora.com>,
        Sakari Ailus <sakari.ailus@...ux.intel.com>,
        linux-media@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, ping-lei.lin@...iatek.com,
        lecopzer.chen@...iatek.com, max.yan@...iatek.com,
        sherlock.chang@...iatek.com, tm.wu@...iatek.com,
        James_Lin <Ping-lei.Lin@...iatek.com>
Subject: Re: [PATCH v2 2/2] media: v4l: Add H265 pixel format

Quoting James_Lin (2022-04-11 09:01:20)
> Add H265 pixel format.
> So driver can recognize external camera devices 
> whom use h265 to describe High Efficiency Video Coding method.
> 
> Signed-off-by: James_Lin <Ping-lei.Lin@...iatek.com>
> ---
>  .../userspace-api/media/v4l/pixfmt-compressed.rst      | 10 ++++++++++
>  drivers/media/v4l2-core/v4l2-ioctl.c                   |  1 +
>  include/uapi/linux/videodev2.h                         |  1 +
>  3 files changed, 12 insertions(+)
> 
> diff --git a/Documentation/userspace-api/media/v4l/pixfmt-compressed.rst b/Documentation/userspace-api/media/v4l/pixfmt-compressed.rst
> index 967fc803ef94..75292aafe2eb 100644
> --- a/Documentation/userspace-api/media/v4l/pixfmt-compressed.rst
> +++ b/Documentation/userspace-api/media/v4l/pixfmt-compressed.rst
> @@ -36,6 +36,16 @@ Compressed Formats
>        - MPEG multiplexed stream. The actual format is determined by
>         extended control ``V4L2_CID_MPEG_STREAM_TYPE``, see
>         :ref:`mpeg-control-id`.
> +    * .. _V4L2-PIX-FMT-H265:
> +
> +      - ``V4L2_PIX_FMT_H265``
> +      - 'H265'
> +      - H.265 Access Unit.
> +       The decoder expects one Access Unit per buffer.
> +       The encoder generates one Access Unit per buffer.
> +       If :ref:`VIDIOC_ENUM_FMT` reports ``V4L2_FMT_FLAG_CONTINUOUS_BYTESTREAM``
> +       then the decoder has no requirements since it can parse all the
> +       information from the raw bytestream.
>      * .. _V4L2-PIX-FMT-H264:
>  
>        - ``V4L2_PIX_FMT_H264``
> diff --git a/drivers/media/v4l2-core/v4l2-ioctl.c b/drivers/media/v4l2-core/v4l2-ioctl.c
> index 96e307fe3aab..aeaeb29307a4 100644
> --- a/drivers/media/v4l2-core/v4l2-ioctl.c
> +++ b/drivers/media/v4l2-core/v4l2-ioctl.c
> @@ -1402,6 +1402,7 @@ static void v4l_fill_fmtdesc(struct v4l2_fmtdesc *fmt)
>                 case V4L2_PIX_FMT_JPEG:         descr = "JFIF JPEG"; break;
>                 case V4L2_PIX_FMT_DV:           descr = "1394"; break;
>                 case V4L2_PIX_FMT_MPEG:         descr = "MPEG-1/2/4"; break;
> +               case V4L2_PIX_FMT_H265:         descr = "H.265"; break;

I'd probably expect H265 to be sorted after H264 ? But I'm not sure this
list is sorted otherwise.

>                 case V4L2_PIX_FMT_H264:         descr = "H.264"; break;
>                 case V4L2_PIX_FMT_H264_NO_SC:   descr = "H.264 (No Start Codes)"; break;
>                 case V4L2_PIX_FMT_H264_MVC:     descr = "H.264 MVC"; break;
> diff --git a/include/uapi/linux/videodev2.h b/include/uapi/linux/videodev2.h
> index 3768a0a80830..636e4236bfb8 100644
> --- a/include/uapi/linux/videodev2.h
> +++ b/include/uapi/linux/videodev2.h
> @@ -691,6 +691,7 @@ struct v4l2_pix_format {
>  #define V4L2_PIX_FMT_JPEG     v4l2_fourcc('J', 'P', 'E', 'G') /* JFIF JPEG     */
>  #define V4L2_PIX_FMT_DV       v4l2_fourcc('d', 'v', 's', 'd') /* 1394          */
>  #define V4L2_PIX_FMT_MPEG     v4l2_fourcc('M', 'P', 'E', 'G') /* MPEG-1/2/4 Multiplexed */
> +#define V4L2_PIX_FMT_H265     v4l2_fourcc('H', '2', '6', '5') /* H265 with start codes */

Likewise.


>  #define V4L2_PIX_FMT_H264     v4l2_fourcc('H', '2', '6', '4') /* H264 with start codes */
>  #define V4L2_PIX_FMT_H264_NO_SC v4l2_fourcc('A', 'V', 'C', '1') /* H264 without start codes */
>  #define V4L2_PIX_FMT_H264_MVC v4l2_fourcc('M', '2', '6', '4') /* H264 MVC */
> -- 
> 2.18.0
>