V4L2_PIX_FMT_NV12MT_16X16 — Variation of
V4L2_PIX_FMT_NV21 with planes
non contiguous in memory.
This is a multi-planar, two-plane version of the YUV 4:2:0 format.
The three components are separated into two sub-images or planes.
V4L2_PIX_FMT_NV12M differs from
in that the two planes are non-contiguous in memory, i.e. the chroma
plane do not necessarily immediately follows the luma plane.
The luminance data occupies the first plane. The Y plane has one byte per pixel.
In the second plane there is a chrominance data with alternating chroma samples.
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_NV12MT_16X16 is the tiled version of
V4L2_PIX_FMT_NV12M with 16x16 macroblock tiles. Here pixels
are arranged in 16x16 2D tiles and tiles are arranged in linear order in memory.
V4L2_PIX_FMT_NV21M is the same as
except the Cb and Cr bytes are swapped, the CrCb plane starts with a Cr byte.
V4L2_PIX_FMT_NV12M is intended to be
used only in drivers and applications that support the multi-planar API,
described in the section called “Single- and multi-planar APIs”.
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_NV12M 4 × 4 pixel image
Byte Order. Each cell is one byte.
|start0 + 0:||Y'00||Y'01||Y'02||Y'03|
|start0 + 4:||Y'10||Y'11||Y'12||Y'13|
|start0 + 8:||Y'20||Y'21||Y'22||Y'23|
|start0 + 12:||Y'30||Y'31||Y'32||Y'33|
|start1 + 0:||Cb00||Cr00||Cb01||Cr01|
|start1 + 4:||Cb10||Cr10||Cb11||Cr11|
Color Sample Location.