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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>
32 lines
776 B
Text
32 lines
776 B
Text
Guidelines for Linux4Linux pixel format 4CCs
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============================================
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Guidelines for Video4Linux 4CC codes defined using v4l2_fourcc() are
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specified in this document. First of the characters defines the nature of
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the pixel format, compression and colour space. The interpretation of the
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other three characters depends on the first one.
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Existing 4CCs may not obey these guidelines.
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Formats
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=======
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Raw bayer
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---------
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The following first characters are used by raw bayer formats:
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B: raw bayer, uncompressed
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b: raw bayer, DPCM compressed
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a: A-law compressed
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u: u-law compressed
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2nd character: pixel order
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B: BGGR
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G: GBRG
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g: GRBG
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R: RGGB
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3rd character: uncompressed bits-per-pixel 0--9, A--
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4th character: compressed bits-per-pixel 0--9, A--
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