1 .. SPDX-License-Identifier: GPL-2.0 1 .. SPDX-License-Identifier: GPL-2.0
2 2
3 Guidelines for Video4Linux pixel format 4CCs 3 Guidelines for Video4Linux pixel format 4CCs
4 ============================================ 4 ============================================
5 5
6 Guidelines for Video4Linux 4CC codes defined u 6 Guidelines for Video4Linux 4CC codes defined using v4l2_fourcc() are
7 specified in this document. First of the chara 7 specified in this document. First of the characters defines the nature of
8 the pixel format, compression and colour space 8 the pixel format, compression and colour space. The interpretation of the
9 other three characters depends on the first on 9 other three characters depends on the first one.
10 10
11 Existing 4CCs may not obey these guidelines. 11 Existing 4CCs may not obey these guidelines.
12 12
13 Raw bayer 13 Raw bayer
14 --------- 14 ---------
15 15
16 The following first characters are used by raw 16 The following first characters are used by raw bayer formats:
17 17
18 - B: raw bayer, uncompressed 18 - B: raw bayer, uncompressed
19 - b: raw bayer, DPCM compressed 19 - b: raw bayer, DPCM compressed
20 - a: A-law compressed 20 - a: A-law compressed
21 - u: u-law compressed 21 - u: u-law compressed
22 22
23 2nd character: pixel order 23 2nd character: pixel order
24 24
25 - B: BGGR 25 - B: BGGR
26 - G: GBRG 26 - G: GBRG
27 - g: GRBG 27 - g: GRBG
28 - R: RGGB 28 - R: RGGB
29 29
30 3rd character: uncompressed bits-per-pixel 0-- 30 3rd character: uncompressed bits-per-pixel 0--9, A--
31 31
32 4th character: compressed bits-per-pixel 0--9, 32 4th character: compressed bits-per-pixel 0--9, A--
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