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SubjectRe: [PATCH v9 1/4] media: v4l: Add definition for the Aspeed JPEG format
Hi Jammy,

Thanks for the update.

On Wed, Sep 21, 2022 at 10:51:09AM +0800, Jammy Huang wrote:
> This introduces support for the Aspeed JPEG format, where the new frame
> can refer to previous frame to reduce the amount of compressed data.
> The concept is similar to I/P frame of video compression. It will
> compare the new frame with previous one to decide which macroblock's
> data is changed, and only the changed macroblocks will be compressed.
>
> This Aspeed JPEG format is used by the video engine on Aspeed platforms,
> which is generally adapted for remote KVM.
>
> Signed-off-by: Jammy Huang <jammy_huang@aspeedtech.com>
> ---
> .../userspace-api/media/v4l/pixfmt-reserved.rst | 17 +++++++++++++++++
> drivers/media/v4l2-core/v4l2-ioctl.c | 1 +
> include/uapi/linux/videodev2.h | 1 +
> 3 files changed, 19 insertions(+)
>
> diff --git a/Documentation/userspace-api/media/v4l/pixfmt-reserved.rst b/Documentation/userspace-api/media/v4l/pixfmt-reserved.rst
> index 0ff68cd8cf62..f62bc76d606f 100644
> --- a/Documentation/userspace-api/media/v4l/pixfmt-reserved.rst
> +++ b/Documentation/userspace-api/media/v4l/pixfmt-reserved.rst
> @@ -258,6 +258,23 @@ please make a proposal on the linux-media mailing list.
> and it is used by various multimedia hardware blocks like GPU, display
> controllers, ISP and video accelerators.
> It contains four planes for progressive video.
> + * .. _V4L2-PIX-FMT-AJPG:
> +
> + - ``V4L2_PIX_FMT_AJPG``
> + - 'AJPG'
> + - ASPEED JPEG format used by the aspeed-video driver on Aspeed platforms,
> + which is generally adapted for remote KVM.
> + On each frame compression, I will compare the new frame with previous
> + one to decide which macroblock's data is changed, and only the changed
> + macroblocks will be compressed.
> +
> + The implementation is based on AST2600 A3 datasheet, revision 0.9, which
> + is not publicly available. Or you can reference Video stream data format
> + – ASPEED mode compression of SDK_User_Guide which available on
> + AspeedTech-BMC/openbmc/releases.
> +
> + Decoder's implementation can be found here,
> + `https://github.com/AspeedTech-BMC/aspeed_codec/ <https://github.com/AspeedTech-BMC/aspeed_codec/>`__

This is better than the previous versions.

Can you still run

$ scripts/checkpatch.pl --strict --max-line-length=80

?

On the decoder --- which values is the user supposed to use for mode_420,
selector and advance_selector parameters? I think this needs to be
documented.

> .. raw:: latex
>
> \normalsize
> diff --git a/drivers/media/v4l2-core/v4l2-ioctl.c b/drivers/media/v4l2-core/v4l2-ioctl.c
> index a1a1b51ac599..c72bc3410bee 100644
> --- a/drivers/media/v4l2-core/v4l2-ioctl.c
> +++ b/drivers/media/v4l2-core/v4l2-ioctl.c
> @@ -1497,6 +1497,7 @@ static void v4l_fill_fmtdesc(struct v4l2_fmtdesc *fmt)
> case V4L2_PIX_FMT_MT21C: descr = "Mediatek Compressed Format"; break;
> case V4L2_PIX_FMT_QC08C: descr = "QCOM Compressed 8-bit Format"; break;
> case V4L2_PIX_FMT_QC10C: descr = "QCOM Compressed 10-bit Format"; break;
> + case V4L2_PIX_FMT_AJPG: descr = "Aspeed JPEG"; break;
> default:
> if (fmt->description[0])
> return;
> diff --git a/include/uapi/linux/videodev2.h b/include/uapi/linux/videodev2.h
> index 86cae23cc446..870a7e5ef8ca 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_HI240 v4l2_fourcc('H', 'I', '2', '4') /* BTTV 8-bit dithered RGB */
> #define V4L2_PIX_FMT_QC08C v4l2_fourcc('Q', '0', '8', 'C') /* Qualcomm 8-bit compressed */
> #define V4L2_PIX_FMT_QC10C v4l2_fourcc('Q', '1', '0', 'C') /* Qualcomm 10-bit compressed */
> +#define V4L2_PIX_FMT_AJPG v4l2_fourcc('A', 'J', 'P', 'G') /* Aspeed JPEG */
>
> /* 10bit raw packed, 32 bytes for every 25 pixels, last LSB 6 bits unused */
> #define V4L2_PIX_FMT_IPU3_SBGGR10 v4l2_fourcc('i', 'p', '3', 'b') /* IPU3 packed 10-bit BGGR bayer */

--
Kind regards,

Sakari Ailus

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