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author | Mauro Carvalho Chehab <mchehab@s-opensource.com> | 2016-07-08 11:40:06 -0300 |
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committer | Mauro Carvalho Chehab <mchehab@s-opensource.com> | 2016-07-08 11:59:40 -0300 |
commit | 60c2820d0f6d3497975b6488e2599f8f611d8b95 (patch) | |
tree | b3b03707c6438ea9b99cc57e847ebf517f968ab1 /Documentation/media/uapi/v4l/pixfmt-yuv420.rst | |
parent | a97369b5e21ea9b8b5fef7c0f4f48bbe60c07ca3 (diff) | |
download | op-kernel-dev-60c2820d0f6d3497975b6488e2599f8f611d8b95.zip op-kernel-dev-60c2820d0f6d3497975b6488e2599f8f611d8b95.tar.gz |
doc_rst: rename the media Sphinx suff to Documentation/media
The name of the subsystem is "media", and not "linux_tv". Also,
as we plan to add other stuff there in the future, let's
rename also the media uAPI book to media_uapi, to make it
clearer.
No functional changes.
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
Diffstat (limited to 'Documentation/media/uapi/v4l/pixfmt-yuv420.rst')
-rw-r--r-- | Documentation/media/uapi/v4l/pixfmt-yuv420.rst | 239 |
1 files changed, 239 insertions, 0 deletions
diff --git a/Documentation/media/uapi/v4l/pixfmt-yuv420.rst b/Documentation/media/uapi/v4l/pixfmt-yuv420.rst new file mode 100644 index 0000000..b22e64c --- /dev/null +++ b/Documentation/media/uapi/v4l/pixfmt-yuv420.rst @@ -0,0 +1,239 @@ +.. -*- coding: utf-8; mode: rst -*- + +.. _V4L2-PIX-FMT-YVU420: +.. _V4L2-PIX-FMT-YUV420: + +********************************************************** +V4L2_PIX_FMT_YVU420 ('YV12'), V4L2_PIX_FMT_YUV420 ('YU12') +********************************************************** + +*man V4L2_PIX_FMT_YVU420(2)* + +V4L2_PIX_FMT_YUV420 +Planar formats with ½ horizontal and vertical chroma resolution, also +known as YUV 4:2:0 + + +Description +=========== + +These are planar formats, 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. For +``V4L2_PIX_FMT_YVU420``, the Cr plane immediately follows the Y plane in +memory. The Cr plane 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, Cr\ :sub:`0` belongs to Y'\ :sub:`00`, +Y'\ :sub:`01`, Y'\ :sub:`10`, and Y'\ :sub:`11`. Following the Cr plane +is the Cb plane, just like the Cr plane. ``V4L2_PIX_FMT_YUV420`` is the +same except the Cb plane comes first, then the Cr 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). + +**Byte Order.** +Each cell is one byte. + + + +.. flat-table:: + :header-rows: 0 + :stub-columns: 0 + :widths: 2 1 1 1 1 + + + - .. row 1 + + - start + 0: + + - Y'\ :sub:`00` + + - Y'\ :sub:`01` + + - Y'\ :sub:`02` + + - Y'\ :sub:`03` + + - .. row 2 + + - start + 4: + + - Y'\ :sub:`10` + + - Y'\ :sub:`11` + + - Y'\ :sub:`12` + + - Y'\ :sub:`13` + + - .. row 3 + + - start + 8: + + - Y'\ :sub:`20` + + - Y'\ :sub:`21` + + - Y'\ :sub:`22` + + - Y'\ :sub:`23` + + - .. row 4 + + - start + 12: + + - Y'\ :sub:`30` + + - Y'\ :sub:`31` + + - Y'\ :sub:`32` + + - Y'\ :sub:`33` + + - .. row 5 + + - start + 16: + + - Cr\ :sub:`00` + + - Cr\ :sub:`01` + + - .. row 6 + + - start + 18: + + - Cr\ :sub:`10` + + - Cr\ :sub:`11` + + - .. row 7 + + - start + 20: + + - Cb\ :sub:`00` + + - Cb\ :sub:`01` + + - .. row 8 + + - start + 22: + + - Cb\ :sub:`10` + + - Cb\ :sub:`11` + + +**Color Sample Location..** + + + +.. flat-table:: + :header-rows: 0 + :stub-columns: 0 + + + - .. row 1 + + - + - 0 + + - + - 1 + + - + - 2 + + - + - 3 + + - .. row 2 + + - 0 + + - Y + + - + - Y + + - + - Y + + - + - Y + + - .. row 3 + + - + - + - C + + - + - + - + - C + + - + + - .. row 4 + + - 1 + + - Y + + - + - Y + + - + - Y + + - + - Y + + - .. row 5 + + - + + - .. row 6 + + - 2 + + - Y + + - + - Y + + - + - Y + + - + - Y + + - .. row 7 + + - + - + - C + + - + - + - + - C + + - + + - .. row 8 + + - 3 + + - Y + + - + - Y + + - + - Y + + - + - Y |