projects / linux-2.6-block.git / blame
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1 | .. SPDX-License-Identifier: GPL-2.0 |
| 2 | ||
| 09d6e35f | 3 | Guidelines for Video4Linux pixel format 4CCs |
| 1e3afaea SA |
4 | ============================================ |
| 5 | ||
| 6 | Guidelines for Video4Linux 4CC codes defined using v4l2_fourcc() are | |
| 7 | specified in this document. First of the characters defines the nature of | |
| 8 | the pixel format, compression and colour space. The interpretation of the | |
| 9 | other three characters depends on the first one. | |
| 10 | ||
| 11 | Existing 4CCs may not obey these guidelines. | |
| 12 | ||
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13 | Raw bayer |
| 14 | --------- | |
| 15 | ||
| 16 | The following first characters are used by raw bayer formats: | |
| 17 | ||
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18 | - B: raw bayer, uncompressed |
| 19 | - b: raw bayer, DPCM compressed | |
| 20 | - a: A-law compressed | |
| 21 | - u: u-law compressed | |
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22 | |
| 23 | 2nd character: pixel order | |
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24 | |
| 25 | - B: BGGR | |
| 26 | - G: GBRG | |
| 27 | - g: GRBG | |
| 28 | - R: RGGB | |
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29 | |
| 30 | 3rd character: uncompressed bits-per-pixel 0--9, A-- | |
| 31 | ||
| 32 | 4th character: compressed bits-per-pixel 0--9, A-- |