[GitHub/mt8127/android_kernel_alcatel_ttab.git] / Documentation / video4linux / 4CCs.txt

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--
Commit	Line	Data
1e3afaea SA	1	Guidelines for Linux4Linux pixel format 4CCs
	2	============================================
	3
	4	Guidelines for Video4Linux 4CC codes defined using v4l2_fourcc() are
	5	specified in this document. First of the characters defines the nature of
	6	the pixel format, compression and colour space. The interpretation of the
	7	other three characters depends on the first one.
	8
	9	Existing 4CCs may not obey these guidelines.
	10
	11	Formats
	12	=======
	13
	14	Raw bayer
	15	---------
	16
	17	The following first characters are used by raw bayer formats:
	18
	19	B: raw bayer, uncompressed
	20	b: raw bayer, DPCM compressed
	21	a: A-law compressed
	22	u: u-law compressed
	23
	24	2nd character: pixel order
	25	B: BGGR
	26	G: GBRG
	27	g: GRBG
	28	R: RGGB
	29
	30	3rd character: uncompressed bits-per-pixel 0--9, A--
	31
	32	4th character: compressed bits-per-pixel 0--9, A--