 Planar YUV formats in the Linux Kernel documentation

Primary source: www.kernel.org/doc/html/latest/userspace-api/media/v4l/pixfmt-yuv-planar.html

Verified locator: §2.7.1.2 opening definitions and Semi-Planar YUV overview table; NV12/NV21/NV12M/NV21M subsection. Two-plane luma/interleaved-Cb-Cr versus fully planar storage,8-bit4:2:0 layouts, reversed chroma pair order and stride/contiguity rules. The article arithmetic assumes even dimensions and a stated untiled layout.