2.6.29. V4L2_PIX_FMT_NV24 (‘NV24’), V4L2_PIX_FMT_NV42 (‘NV42’)¶
V4L2_PIX_FMT_NV42
Formats with full horizontal and vertical chroma resolutions, also known
as YUV 4:4:4. One luminance and one chrominance plane with alternating
chroma samples as opposed to V4L2_PIX_FMT_YVU420
2.6.29.1. Description¶
These are two-plane versions of the YUV 4:4:4 format. The three
components are separated into two sub-images or planes. The Y plane is
first, with each Y sample stored in one byte per pixel. For
V4L2_PIX_FMT_NV24, a combined CbCr plane immediately follows the Y
plane in memory. The CbCr plane has the same width and height, in
pixels, as the Y plane (and the image). Each line contains one CbCr pair
per pixel, with each Cb and Cr sample stored in one byte.
V4L2_PIX_FMT_NV42 is the same except that the Cb and Cr samples are
swapped, the CrCb plane starts with a Cr sample.
If the Y plane has pad bytes after each row, then the CbCr plane has twice as many pad bytes after its rows.
Byte Order. Each cell is one byte.
| start + 0: | Y’00 | Y’01 | Y’02 | Y’03 | ||||
| start + 4: | Y’10 | Y’11 | Y’12 | Y’13 | ||||
| start + 8: | Y’20 | Y’21 | Y’22 | Y’23 | ||||
| start + 12: | Y’30 | Y’31 | Y’32 | Y’33 | ||||
| start + 16: | Cb00 | Cr00 | Cb01 | Cr01 | Cb02 | Cr02 | Cb03 | Cr03 |
| start + 24: | Cb10 | Cr10 | Cb11 | Cr11 | Cb12 | Cr12 | Cb13 | Cr13 |
| start + 32: | Cb20 | Cr20 | Cb21 | Cr21 | Cb22 | Cr22 | Cb23 | Cr23 |
| start + 40: | Cb30 | Cr30 | Cb31 | Cr31 | Cb32 | Cr32 | Cb33 | Cr33 |