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| author | Mauro Carvalho Chehab <mchehab+huawei@kernel.org> | 2020-03-06 10:34:41 +0300 |
|---|---|---|
| committer | Mauro Carvalho Chehab <mchehab+huawei@kernel.org> | 2020-04-14 11:32:45 +0300 |
| commit | 2e9a7e0bc191c6dc97a0b3cb994b83834179a42b (patch) | |
| tree | 82cf26174d0e40a7863ff99cd326d709d334dbce /Documentation/userspace-api/media | |
| parent | ff768f596fa19e719c88fbc9bd65e13145d944e7 (diff) | |
| download | linux-2e9a7e0bc191c6dc97a0b3cb994b83834179a42b.tar.xz | |
media: docs: move fourcc file to the uAPI document
This file gives a hint about how fourcc should be named.
It is on a very weird place, as such kind of thing belongs to the
uAPI guide.
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Diffstat (limited to 'Documentation/userspace-api/media')
| -rw-r--r-- | Documentation/userspace-api/media/v4l/common.rst | 1 | ||||
| -rw-r--r-- | Documentation/userspace-api/media/v4l/fourcc.rst | 32 |
2 files changed, 33 insertions, 0 deletions
diff --git a/Documentation/userspace-api/media/v4l/common.rst b/Documentation/userspace-api/media/v4l/common.rst index af28ac1bcf88..7d81c58a13cd 100644 --- a/Documentation/userspace-api/media/v4l/common.rst +++ b/Documentation/userspace-api/media/v4l/common.rst @@ -57,6 +57,7 @@ applicable to all devices. ext-ctrls-fm-tx ext-ctrls-fm-rx ext-ctrls-detect + fourcc format planar-apis selection-api diff --git a/Documentation/userspace-api/media/v4l/fourcc.rst b/Documentation/userspace-api/media/v4l/fourcc.rst new file mode 100644 index 000000000000..d3482c40da62 --- /dev/null +++ b/Documentation/userspace-api/media/v4l/fourcc.rst @@ -0,0 +1,32 @@ +.. SPDX-License-Identifier: GPL-2.0 + +Guidelines for Video4Linux pixel format 4CCs +============================================ + +Guidelines for Video4Linux 4CC codes defined using v4l2_fourcc() are +specified in this document. First of the characters defines the nature of +the pixel format, compression and colour space. The interpretation of the +other three characters depends on the first one. + +Existing 4CCs may not obey these guidelines. + +Raw bayer +--------- + +The following first characters are used by raw bayer formats: + +- B: raw bayer, uncompressed +- b: raw bayer, DPCM compressed +- a: A-law compressed +- u: u-law compressed + +2nd character: pixel order + +- B: BGGR +- G: GBRG +- g: GRBG +- R: RGGB + +3rd character: uncompressed bits-per-pixel 0--9, A-- + +4th character: compressed bits-per-pixel 0--9, A-- |