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<refentry id="V4L2-PIX-FMT-YUV411P">
<refmeta>
<refentrytitle>V4L2_PIX_FMT_YUV411P ('411P')</refentrytitle>
&manvol;
</refmeta>
<refnamediv>
<refname><constant>V4L2_PIX_FMT_YUV411P</constant></refname>
<refpurpose>Format with ¼ horizontal chroma resolution,
also known as YUV 4:1:1. Planar layout as opposed to
<constant>V4L2_PIX_FMT_Y41P</constant></refpurpose>
</refnamediv>
<refsect1>
<title>Description</title>
<para>This format is not commonly used. This is a planar
format similar to the 4:2:2 planar format except with half as many
chroma. 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
¼ the width of the Y plane (and of the image). Each Cb belongs
to 4 pixels all on the same row. For example,
Cb<subscript>0</subscript> belongs to Y'<subscript>00</subscript>,
Y'<subscript>01</subscript>, Y'<subscript>02</subscript> and
Y'<subscript>03</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 ¼ as many pad bytes after their rows. In
other words, four C x rows (including padding) is exactly as long as
one Y row (including padding).</para>
<example>
<title><constant>V4L2_PIX_FMT_YUV411P</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>
</row>
<row>
<entry>start + 17:</entry>
<entry>Cb<subscript>10</subscript></entry>
</row>
<row>
<entry>start + 18:</entry>
<entry>Cb<subscript>20</subscript></entry>
</row>
<row>
<entry>start + 19:</entry>
<entry>Cb<subscript>30</subscript></entry>
</row>
<row>
<entry>start + 20:</entry>
<entry>Cr<subscript>00</subscript></entry>
</row>
<row>
<entry>start + 21:</entry>
<entry>Cr<subscript>10</subscript></entry>
</row>
<row>
<entry>start + 22:</entry>
<entry>Cr<subscript>20</subscript></entry>
</row>
<row>
<entry>start + 23:</entry>
<entry>Cr<subscript>30</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>C</entry>
<entry>Y</entry><entry></entry><entry>Y</entry>
</row>
<row>
<entry>1</entry>
<entry>Y</entry><entry></entry><entry>Y</entry><entry>C</entry>
<entry>Y</entry><entry></entry><entry>Y</entry>
</row>
<row>
<entry>2</entry>
<entry>Y</entry><entry></entry><entry>Y</entry><entry>C</entry>
<entry>Y</entry><entry></entry><entry>Y</entry>
</row>
<row>
<entry>3</entry>
<entry>Y</entry><entry></entry><entry>Y</entry><entry>C</entry>
<entry>Y</entry><entry></entry><entry>Y</entry>
</row>
</tbody>
</tgroup>
</informaltable>
</para>
</formalpara>
</example>
</refsect1>
</refentry>
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