Messages in this thread | | | Date | Mon, 17 Jan 2022 15:18:22 +0800 | Subject | Re: [PATCH v8 1/4] media: v4l: Add definition for the Aspeed JPEG format | From | Jammy Huang <> |
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On 2022/1/17 上午 10:24, Joel Stanley wrote: > On Mon, 17 Jan 2022 at 02:00, Jammy Huang <jammy_huang@aspeedtech.com> wrote: >> Hi Hans, >> >> On 2022/1/14 下午 04:11, Hans Verkuil wrote: >>> On 24/12/2021 02:27, 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> >>>> --- >>>> v8: >>>> - Add decoder information for aspeed-jpeg >>>> v7: >>>> - Add more information for aspeed-jpeg >>>> v6: >>>> - Update description for new format, aspeed-jpeg, in Documentation. >>>> v5: >>>> - no update >>>> v4: >>>> - new >>>> --- >>>> .../media/uapi/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/media/uapi/v4l/pixfmt-reserved.rst b/Documentation/media/uapi/v4l/pixfmt-reserved.rst >>> This is the wrong file! It should be: >>> >>> Documentation/userspace-api/media/v4l/pixfmt-reserved.rst >> Thanks, I just used git format-patch to generate the cover-letter and >> didn't notice this. >> >> It looks like the file, pixfmt-reserved.rst, has different path in >> different Linux kernel, >> >> * 5.4: Documentation/media/uapi/v4l/pixfmt-reserved.rst >> >> * 5.10/5.15: Documentation/userspace-api/media/v4l/pixfmt-reserved.rst >> >> 5.4 is the one I based to submit the patches. >> >> Could you suggest the kernel that I should based to submit these patches?? > You should always submit based on the latest release. > > There are sometimes exceptions where you will base your patches on > something even newer, but generally you should grab the latest. > > Be sure to re-test on the latest kernel before submitting. OK, thank you. > > Cheers, > > Joel > >> I will need to change the number of V4L2_CID_USER_ASPEED_BASE per different >> >> linux kernel as well. >> >>> Regards, >>> >>> Hans >>> >>>> index b2cd155e691b..1d0dc8d86ed7 100644 >>>> --- a/Documentation/media/uapi/v4l/pixfmt-reserved.rst >>>> +++ b/Documentation/media/uapi/v4l/pixfmt-reserved.rst >>>> @@ -264,6 +264,23 @@ please make a proposal on the linux-media mailing list. >>>> of tiles, resulting in 32-aligned resolutions for the luminance plane >>>> and 16-aligned resolutions for the chrominance plane (with 2x2 >>>> subsampling). >>>> + * .. _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/>`__ >>>> >>>> .. tabularcolumns:: |p{6.6cm}|p{2.2cm}|p{8.7cm}| >>>> >>>> diff --git a/drivers/media/v4l2-core/v4l2-ioctl.c b/drivers/media/v4l2-core/v4l2-ioctl.c >>>> index 24db33f803c0..00dde01d2f97 100644 >>>> --- a/drivers/media/v4l2-core/v4l2-ioctl.c >>>> +++ b/drivers/media/v4l2-core/v4l2-ioctl.c >>>> @@ -1378,6 +1378,7 @@ static void v4l_fill_fmtdesc(struct v4l2_fmtdesc *fmt) >>>> case V4L2_PIX_FMT_S5C_UYVY_JPG: descr = "S5C73MX interleaved UYVY/JPEG"; break; >>>> case V4L2_PIX_FMT_MT21C: descr = "Mediatek Compressed Format"; break; >>>> case V4L2_PIX_FMT_SUNXI_TILED_NV12: descr = "Sunxi Tiled NV12 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 3210b3c82a4a..994eb6155ea9 100644 >>>> --- a/include/uapi/linux/videodev2.h >>>> +++ b/include/uapi/linux/videodev2.h >>>> @@ -726,6 +726,7 @@ struct v4l2_pix_format { >>>> #define V4L2_PIX_FMT_INZI v4l2_fourcc('I', 'N', 'Z', 'I') /* Intel Planar Greyscale 10-bit and Depth 16-bit */ >>>> #define V4L2_PIX_FMT_SUNXI_TILED_NV12 v4l2_fourcc('S', 'T', '1', '2') /* Sunxi Tiled NV12 Format */ >>>> #define V4L2_PIX_FMT_CNF4 v4l2_fourcc('C', 'N', 'F', '4') /* Intel 4-bit packed depth confidence information */ >>>> +#define V4L2_PIX_FMT_AJPG v4l2_fourcc('A', 'J', 'P', 'G') /* Aspeed JPEG */ >>>> >>>> /* 10bit raw bayer 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 */ >> -- >> Best Regards >> Jammy >> -- Best Regards Jammy
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