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[media] v4l: Document raw bayer 4CC codes 

Document guidelines how 4CC codes should be named. Only raw bayer is
included currently. Other formats should be documented later on.

Signed-off-by: Sakari Ailus <sakari.ailus@iki.fi>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
This commit is contained in:
Sakari Ailus 2012-01-17 17:47:22 -03:00 committed by Mauro Carvalho Chehab
parent c643ee1351
commit 1e3afaea56
1 changed files with 32 additions and 0 deletions
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Documentation/video4linux/4CCs.txt Normal file
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Guidelines for Linux4Linux 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.
Formats
=======
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--