2.6.22. V4L2_PIX_FMT_YUV422P (‘422P’)¶
Format with ½ horizontal chroma resolution, also known as YUV 4:2:2.
Planar layout as opposed to V4L2_PIX_FMT_YUYV
2.6.22.1. Description¶
This format is not commonly used. This is a planar version of the YUYV format. The three components are separated into three sub-images or planes. The Y plane is first. The Y plane has one byte per pixel. The Cb plane immediately follows the Y plane in memory. The Cb plane is half the width of the Y plane (and of the image). Each Cb belongs to two pixels. For example, Cb0 belongs to Y’00, Y’01. Following the Cb plane is the Cr plane, just like the Cb plane.
If the Y plane has pad bytes after each row, then the Cr and Cb planes have half as many pad bytes after their rows. In other words, two Cx rows (including padding) is exactly as long as one Y row (including padding).
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 | Cb01 | ||
| start + 18: | Cb10 | Cb11 | ||
| start + 20: | Cb20 | Cb21 | ||
| start + 22: | Cb30 | Cb31 | ||
| start + 24: | Cr00 | Cr01 | ||
| start + 26: | Cr10 | Cr11 | ||
| start + 28: | Cr20 | Cr21 | ||
| start + 30: | Cr30 | Cr31 | ||
Color Sample Location:
| 0 | 1 | 2 | 3 | |||
| 0 | Y | C | Y | Y | C | Y |
| 1 | Y | C | Y | Y | C | Y |
| 2 | Y | C | Y | Y | C | Y |
| 3 | Y | C | Y | Y | C | Y |