V4L2_PIX_FMT_YVU420M ('YM21')
&manvol;
V4L2_PIX_FMT_YVU420M
Variation of V4L2_PIX_FMT_YVU420
with planes non contiguous in memory.
Description
This is a multi-planar format, as opposed to a packed 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 Cr data
constitutes the second plane which is half the width and half
the height of the Y plane (and of the image). Each Cr belongs to four
pixels, a two-by-two square of the image. For example,
Cr0 belongs to Y'00,
Y'01, Y'10, and
Y'11. The Cb data, just like the Cr plane, constitutes
the third 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).
V4L2_PIX_FMT_YVU420M is intended to be
used only in drivers and applications that support the multi-planar API,
described in .
<constant>V4L2_PIX_FMT_YVU420M</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:
Cr00
Cr01
start1 + 2:
Cr10
Cr11
|
start2 + 0:
Cb00
Cb01
start2 + 2:
Cb10
Cb11
Color Sample Location.
01
23
0
YY
YY
C
C
1
YY
YY
2
YY
YY
C
C
3
YY
YY