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- <refentry>
- <refmeta>
- <refentrytitle>V4L2_PIX_FMT_YUV422M ('YM16'), V4L2_PIX_FMT_YVU422M ('YM61')</refentrytitle>
- &manvol;
- </refmeta>
- <refnamediv>
- <refname id="V4L2-PIX-FMT-YUV422M"><constant>V4L2_PIX_FMT_YUV422M</constant></refname>
- <refname id="V4L2-PIX-FMT-YVU422M"><constant>V4L2_PIX_FMT_YVU422M</constant></refname>
- <refpurpose>Planar formats with &frac12; horizontal resolution, also
- known as YUV and YVU 4:2:2</refpurpose>
- </refnamediv>
-
- <refsect1>
- <title>Description</title>
-
- <para>This is a multi-planar format, as opposed to a packed format.
-The three components are separated into three sub-images or planes.</para>
-
- <para>The Y plane is first. The Y plane has one byte per pixel.
-For <constant>V4L2_PIX_FMT_YUV422M</constant> the Cb data
-constitutes the second plane which 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>. The Cr data, just like the Cb plane, is
-in the third plane. </para>
-
- <para><constant>V4L2_PIX_FMT_YVU422M</constant> is the same except
-the Cr data is stored in the second plane and the Cb data in the third plane.
-</para>
-
- <para>If the Y plane has pad bytes after each row, then the Cb
-and Cr 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>
-
- <para><constant>V4L2_PIX_FMT_YUV422M</constant> and
-<constant>V4L2_PIX_FMT_YVU422M</constant> are intended to be
-used only in drivers and applications that support the multi-planar API,
-described in <xref linkend="planar-apis"/>. </para>
-
- <example>
- <title><constant>V4L2_PIX_FMT_YUV422M</constant> 4 &times; 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>start0&nbsp;+&nbsp;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>start0&nbsp;+&nbsp;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>start0&nbsp;+&nbsp;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>start0&nbsp;+&nbsp;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></entry></row>
- <row>
- <entry>start1&nbsp;+&nbsp;0:</entry>
- <entry>Cb<subscript>00</subscript></entry>
- <entry>Cb<subscript>01</subscript></entry>
- </row>
- <row>
- <entry>start1&nbsp;+&nbsp;2:</entry>
- <entry>Cb<subscript>10</subscript></entry>
- <entry>Cb<subscript>11</subscript></entry>
- </row>
- <row>
- <entry>start1&nbsp;+&nbsp;4:</entry>
- <entry>Cb<subscript>20</subscript></entry>
- <entry>Cb<subscript>21</subscript></entry>
- </row>
- <row>
- <entry>start1&nbsp;+&nbsp;6:</entry>
- <entry>Cb<subscript>30</subscript></entry>
- <entry>Cb<subscript>31</subscript></entry>
- </row>
- <row><entry></entry></row>
- <row>
- <entry>start2&nbsp;+&nbsp;0:</entry>
- <entry>Cr<subscript>00</subscript></entry>
- <entry>Cr<subscript>01</subscript></entry>
- </row>
- <row>
- <entry>start2&nbsp;+&nbsp;2:</entry>
- <entry>Cr<subscript>10</subscript></entry>
- <entry>Cr<subscript>11</subscript></entry>
- </row>
- <row>
- <entry>start2&nbsp;+&nbsp;4:</entry>
- <entry>Cr<subscript>20</subscript></entry>
- <entry>Cr<subscript>21</subscript></entry>
- </row>
- <row>
- <entry>start2&nbsp;+&nbsp;6:</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>