mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-11-17 17:24:17 +08:00
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>
142 lines
4.6 KiB
XML
142 lines
4.6 KiB
XML
<refentry>
|
|
<refmeta>
|
|
<refentrytitle>V4L2_PIX_FMT_YVU410 ('YVU9'), V4L2_PIX_FMT_YUV410 ('YUV9')</refentrytitle>
|
|
&manvol;
|
|
</refmeta>
|
|
<refnamediv>
|
|
<refname id="V4L2-PIX-FMT-YVU410"><constant>V4L2_PIX_FMT_YVU410</constant></refname>
|
|
<refname id="V4L2-PIX-FMT-YUV410"><constant>V4L2_PIX_FMT_YUV410</constant></refname>
|
|
<refpurpose>Planar formats with ¼ horizontal and
|
|
vertical chroma resolution, also known as YUV 4:1:0</refpurpose>
|
|
</refnamediv>
|
|
<refsect1>
|
|
<title>Description</title>
|
|
|
|
<para>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
|
|
<constant>V4L2_PIX_FMT_YVU410</constant>, the Cr plane immediately
|
|
follows the Y plane in memory. The Cr plane is ¼ the width and
|
|
¼ the height of the Y plane (and of the image). Each Cr belongs
|
|
to 16 pixels, a four-by-four square of the image. Following the Cr
|
|
plane is the Cb plane, just like the Cr plane.
|
|
<constant>V4L2_PIX_FMT_YUV410</constant> is the same, except the Cb
|
|
plane comes first, then the Cr plane.</para>
|
|
|
|
<para>If the Y plane has pad bytes after each row, then the Cr
|
|
and Cb planes have ¼ as many pad bytes after their rows. In
|
|
other words, four Cx rows (including padding) are exactly as long as
|
|
one Y row (including padding).</para>
|
|
|
|
<example>
|
|
<title><constant>V4L2_PIX_FMT_YVU410</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>Cr<subscript>00</subscript></entry>
|
|
</row>
|
|
<row>
|
|
<entry>start + 17:</entry>
|
|
<entry>Cb<subscript>00</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></entry><entry>Y</entry><entry></entry>
|
|
<entry>Y</entry><entry></entry><entry>Y</entry>
|
|
</row>
|
|
<row>
|
|
<entry></entry>
|
|
</row>
|
|
<row>
|
|
<entry>1</entry>
|
|
<entry>Y</entry><entry></entry><entry>Y</entry><entry></entry>
|
|
<entry>Y</entry><entry></entry><entry>Y</entry>
|
|
</row>
|
|
<row>
|
|
<entry></entry>
|
|
<entry></entry><entry></entry><entry></entry><entry>C</entry>
|
|
<entry></entry><entry></entry><entry></entry>
|
|
</row>
|
|
<row>
|
|
<entry>2</entry>
|
|
<entry>Y</entry><entry></entry><entry>Y</entry><entry></entry>
|
|
<entry>Y</entry><entry></entry><entry>Y</entry>
|
|
</row>
|
|
<row>
|
|
<entry></entry>
|
|
</row>
|
|
<row>
|
|
<entry>3</entry>
|
|
<entry>Y</entry><entry></entry><entry>Y</entry><entry></entry>
|
|
<entry>Y</entry><entry></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:
|
|
-->
|