V4L2_PIX_FMT_NV21 — Formats with ½ horizontal and vertical
chroma resolution, also known as YUV 4:2:0. One luminance and one
chrominance plane with alternating chroma samples as opposed to
These are two-plane versions of the YUV 4:2:0 format.
The three components are separated into two sub-images or planes. The
Y plane is first. The Y plane has one byte per pixel. For
V4L2_PIX_FMT_NV12, a combined CbCr plane
immediately follows the Y plane in memory. The CbCr plane is the same
width, in bytes, as the Y plane (and of the image), but is half as
tall in pixels. Each CbCr pair belongs to four pixels. For example,
Cb0/Cr0 belongs to
V4L2_PIX_FMT_NV21 is the same except the Cb and
Cr bytes are swapped, the CrCb plane starts with a Cr byte.
If the Y plane has pad bytes after each row, then the CbCr plane has as many pad bytes after its rows.
V4L2_PIX_FMT_NV12 4 × 4
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|
|start + 20:||Cb10||Cr10||Cb11||Cr11|
Color Sample Location.