mirror of
https://github.com/adulau/aha.git
synced 2024-12-30 20:56:23 +00:00
8e080c2e6c
The V4L and DVB API's are there for a long time. however, up to now, no efforts were done to merge them to kernel DocBook. This patch adds the current versions of the specs as an unique compendium. Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
161 lines
5.3 KiB
XML
161 lines
5.3 KiB
XML
<refentry id="V4L2-PIX-FMT-YUV422P">
|
|
<refmeta>
|
|
<refentrytitle>V4L2_PIX_FMT_YUV422P ('422P')</refentrytitle>
|
|
&manvol;
|
|
</refmeta>
|
|
<refnamediv>
|
|
<refname><constant>V4L2_PIX_FMT_YUV422P</constant></refname>
|
|
<refpurpose>Format with ½ horizontal chroma resolution,
|
|
also known as YUV 4:2:2. Planar layout as opposed to
|
|
<constant>V4L2_PIX_FMT_YUYV</constant></refpurpose>
|
|
</refnamediv>
|
|
<refsect1>
|
|
<title>Description</title>
|
|
|
|
<para>This format is not commonly used. This is a planar
|
|
version of the YUYV 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 Cb plane immediately follows the Y plane in
|
|
memory. The Cb plane is half the width of the Y plane (and of the
|
|
image). Each Cb belongs to two pixels. For example,
|
|
Cb<subscript>0</subscript> belongs to Y'<subscript>00</subscript>,
|
|
Y'<subscript>01</subscript>. Following the Cb plane is the Cr plane,
|
|
just like the Cb plane.</para>
|
|
|
|
<para>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).</para>
|
|
|
|
<example>
|
|
<title><constant>V4L2_PIX_FMT_YUV422P</constant> 4 × 4
|
|
pixel image</title>
|
|
|
|
<formalpara>
|
|
<title>Byte Order.</title>
|
|
<para>Each cell is one byte.
|
|
<informaltable frame="none">
|
|
<tgroup cols="5" align="center">
|
|
<colspec align="left" colwidth="2*" />
|
|
<tbody valign="top">
|
|
<row>
|
|
<entry>start + 0:</entry>
|
|
<entry>Y'<subscript>00</subscript></entry>
|
|
<entry>Y'<subscript>01</subscript></entry>
|
|
<entry>Y'<subscript>02</subscript></entry>
|
|
<entry>Y'<subscript>03</subscript></entry>
|
|
</row>
|
|
<row>
|
|
<entry>start + 4:</entry>
|
|
<entry>Y'<subscript>10</subscript></entry>
|
|
<entry>Y'<subscript>11</subscript></entry>
|
|
<entry>Y'<subscript>12</subscript></entry>
|
|
<entry>Y'<subscript>13</subscript></entry>
|
|
</row>
|
|
<row>
|
|
<entry>start + 8:</entry>
|
|
<entry>Y'<subscript>20</subscript></entry>
|
|
<entry>Y'<subscript>21</subscript></entry>
|
|
<entry>Y'<subscript>22</subscript></entry>
|
|
<entry>Y'<subscript>23</subscript></entry>
|
|
</row>
|
|
<row>
|
|
<entry>start + 12:</entry>
|
|
<entry>Y'<subscript>30</subscript></entry>
|
|
<entry>Y'<subscript>31</subscript></entry>
|
|
<entry>Y'<subscript>32</subscript></entry>
|
|
<entry>Y'<subscript>33</subscript></entry>
|
|
</row>
|
|
<row>
|
|
<entry>start + 16:</entry>
|
|
<entry>Cb<subscript>00</subscript></entry>
|
|
<entry>Cb<subscript>01</subscript></entry>
|
|
</row>
|
|
<row>
|
|
<entry>start + 18:</entry>
|
|
<entry>Cb<subscript>10</subscript></entry>
|
|
<entry>Cb<subscript>11</subscript></entry>
|
|
</row>
|
|
<row>
|
|
<entry>start + 20:</entry>
|
|
<entry>Cb<subscript>20</subscript></entry>
|
|
<entry>Cb<subscript>21</subscript></entry>
|
|
</row>
|
|
<row>
|
|
<entry>start + 22:</entry>
|
|
<entry>Cb<subscript>30</subscript></entry>
|
|
<entry>Cb<subscript>31</subscript></entry>
|
|
</row>
|
|
<row>
|
|
<entry>start + 24:</entry>
|
|
<entry>Cr<subscript>00</subscript></entry>
|
|
<entry>Cr<subscript>01</subscript></entry>
|
|
</row>
|
|
<row>
|
|
<entry>start + 26:</entry>
|
|
<entry>Cr<subscript>10</subscript></entry>
|
|
<entry>Cr<subscript>11</subscript></entry>
|
|
</row>
|
|
<row>
|
|
<entry>start + 28:</entry>
|
|
<entry>Cr<subscript>20</subscript></entry>
|
|
<entry>Cr<subscript>21</subscript></entry>
|
|
</row>
|
|
<row>
|
|
<entry>start + 30:</entry>
|
|
<entry>Cr<subscript>30</subscript></entry>
|
|
<entry>Cr<subscript>31</subscript></entry>
|
|
</row>
|
|
</tbody>
|
|
</tgroup>
|
|
</informaltable>
|
|
</para>
|
|
</formalpara>
|
|
|
|
<formalpara>
|
|
<title>Color Sample Location.</title>
|
|
<para>
|
|
<informaltable frame="none">
|
|
<tgroup cols="7" align="center">
|
|
<tbody valign="top">
|
|
<row>
|
|
<entry></entry>
|
|
<entry>0</entry><entry></entry><entry>1</entry><entry></entry>
|
|
<entry>2</entry><entry></entry><entry>3</entry>
|
|
</row>
|
|
<row>
|
|
<entry>0</entry>
|
|
<entry>Y</entry><entry>C</entry><entry>Y</entry><entry></entry>
|
|
<entry>Y</entry><entry>C</entry><entry>Y</entry>
|
|
</row>
|
|
<row>
|
|
<entry>1</entry>
|
|
<entry>Y</entry><entry>C</entry><entry>Y</entry><entry></entry>
|
|
<entry>Y</entry><entry>C</entry><entry>Y</entry>
|
|
</row>
|
|
<row>
|
|
<entry>2</entry>
|
|
<entry>Y</entry><entry>C</entry><entry>Y</entry><entry></entry>
|
|
<entry>Y</entry><entry>C</entry><entry>Y</entry>
|
|
</row>
|
|
<row>
|
|
<entry>3</entry>
|
|
<entry>Y</entry><entry>C</entry><entry>Y</entry><entry></entry>
|
|
<entry>Y</entry><entry>C</entry><entry>Y</entry>
|
|
</row>
|
|
</tbody>
|
|
</tgroup>
|
|
</informaltable>
|
|
</para>
|
|
</formalpara>
|
|
</example>
|
|
</refsect1>
|
|
</refentry>
|
|
|
|
<!--
|
|
Local Variables:
|
|
mode: sgml
|
|
sgml-parent-document: "pixfmt.sgml"
|
|
indent-tabs-mode: nil
|
|
End:
|
|
-->
|