V4L2_PIX_FMT_NV12M ('NV12M')
&manvol;
V4L2_PIX_FMT_NV12M
Variation of V4L2_PIX_FMT_NV12 with planes
non contiguous in memory.
Description
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 V4L2_PIX_FMT_NV12
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
Y'00, Y'01,
Y'10, Y'11.
V4L2_PIX_FMT_NV12M is intended to be
used only in drivers and applications that support the multi-planar API,
described in .
If the Y plane has pad bytes after each row, then the
CbCr plane has as many pad bytes after its rows.
<constant>V4L2_PIX_FMT_NV12M</constant> 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.
01
23
0
YY
YY
C
C
1
YY
YY
2
YY
YY
C
C
3
YY
YY