linux/Documentation/video4linux/4CCs.txt
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   1Guidelines for Linux4Linux pixel format 4CCs
   2============================================
   3
   4Guidelines for Video4Linux 4CC codes defined using v4l2_fourcc() are
   5specified in this document. First of the characters defines the nature of
   6the pixel format, compression and colour space. The interpretation of the
   7other three characters depends on the first one.
   8
   9Existing 4CCs may not obey these guidelines.
  10
  11Formats
  12=======
  13
  14Raw bayer
  15---------
  16
  17The 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
  242nd character: pixel order
  25        B: BGGR
  26        G: GBRG
  27        g: GRBG
  28        R: RGGB
  29
  303rd character: uncompressed bits-per-pixel 0--9, A--
  31
  324th character: compressed bits-per-pixel 0--9, A--
  33
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