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Diffstat (limited to 'Documentation/userspace-api/media/v4l/pixfmt-reserved.rst')
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diff --git a/Documentation/userspace-api/media/v4l/pixfmt-reserved.rst b/Documentation/userspace-api/media/v4l/pixfmt-reserved.rst index 0ff68cd8cf62..1cf6c59f4bc4 100644 --- a/Documentation/userspace-api/media/v4l/pixfmt-reserved.rst +++ b/Documentation/userspace-api/media/v4l/pixfmt-reserved.rst @@ -1,4 +1,5 @@ .. SPDX-License-Identifier: GFDL-1.1-no-invariants-or-later +.. c:namespace:: V4L .. _pixfmt-reserved: @@ -258,6 +259,30 @@ 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 + `github <https://github.com/AspeedTech-BMC/openbmc/releases/>`__. + + Decoder's implementation can be found here, + `aspeed_codec <https://github.com/AspeedTech-BMC/aspeed_codec/>`__ + * .. _V4L2-PIX-FMT-HEXTILE: + + - ``V4L2_PIX_FMT_HEXTILE`` + - 'HXTL' + - Compressed format used by Nuvoton NPCM video driver. This format is + defined in Remote Framebuffer Protocol (RFC 6143, chapter 7.7.4 Hextile + Encoding). .. raw:: latex \normalsize |