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- <refentry>
- <refmeta>
- <refentrytitle>V4L2_PIX_FMT_NV24 ('NV24'), V4L2_PIX_FMT_NV42 ('NV42')</refentrytitle>
- &manvol;
- </refmeta>
- <refnamediv>
- <refname id="V4L2-PIX-FMT-NV24"><constant>V4L2_PIX_FMT_NV24</constant></refname>
- <refname id="V4L2-PIX-FMT-NV42"><constant>V4L2_PIX_FMT_NV42</constant></refname>
- <refpurpose>Formats with full horizontal and vertical
-chroma resolutions, also known as YUV 4:4:4. One luminance and one
-chrominance plane with alternating chroma samples as opposed to
-<constant>V4L2_PIX_FMT_YVU420</constant></refpurpose>
- </refnamediv>
- <refsect1>
- <title>Description</title>
-
- <para>These are two-plane versions of the YUV 4:4:4 format. The three
- components are separated into two sub-images or planes. The Y plane is
- first, with each Y sample stored in one byte per pixel. For
- <constant>V4L2_PIX_FMT_NV24</constant>, a combined CbCr plane
- immediately follows the Y plane in memory. The CbCr plane has the same
- width and height, in pixels, as the Y plane (and the image). Each line
- contains one CbCr pair per pixel, with each Cb and Cr sample stored in
- one byte. <constant>V4L2_PIX_FMT_NV42</constant> is the same except that
- the Cb and Cr samples are swapped, the CrCb plane starts with a Cr
- sample.</para>
-
- <para>If the Y plane has pad bytes after each row, then the CbCr plane
- has twice as many pad bytes after its rows.</para>
-
- <example>
- <title><constant>V4L2_PIX_FMT_NV24</constant> 4 &times; 4
-pixel image</title>
-
- <formalpara>
- <title>Byte Order.</title>
- <para>Each cell is one byte.
- <informaltable frame="none">
- <tgroup cols="9" align="center">
- <colspec align="left" colwidth="2*" />
- <tbody valign="top">
- <row>
- <entry>start&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>start&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>start&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>start&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>start&nbsp;+&nbsp;16:</entry>
- <entry>Cb<subscript>00</subscript></entry>
- <entry>Cr<subscript>00</subscript></entry>
- <entry>Cb<subscript>01</subscript></entry>
- <entry>Cr<subscript>01</subscript></entry>
- <entry>Cb<subscript>02</subscript></entry>
- <entry>Cr<subscript>02</subscript></entry>
- <entry>Cb<subscript>03</subscript></entry>
- <entry>Cr<subscript>03</subscript></entry>
- </row>
- <row>
- <entry>start&nbsp;+&nbsp;24:</entry>
- <entry>Cb<subscript>10</subscript></entry>
- <entry>Cr<subscript>10</subscript></entry>
- <entry>Cb<subscript>11</subscript></entry>
- <entry>Cr<subscript>11</subscript></entry>
- <entry>Cb<subscript>12</subscript></entry>
- <entry>Cr<subscript>12</subscript></entry>
- <entry>Cb<subscript>13</subscript></entry>
- <entry>Cr<subscript>13</subscript></entry>
- </row>
- <row>
- <entry>start&nbsp;+&nbsp;32:</entry>
- <entry>Cb<subscript>20</subscript></entry>
- <entry>Cr<subscript>20</subscript></entry>
- <entry>Cb<subscript>21</subscript></entry>
- <entry>Cr<subscript>21</subscript></entry>
- <entry>Cb<subscript>22</subscript></entry>
- <entry>Cr<subscript>22</subscript></entry>
- <entry>Cb<subscript>23</subscript></entry>
- <entry>Cr<subscript>23</subscript></entry>
- </row>
- <row>
- <entry>start&nbsp;+&nbsp;40:</entry>
- <entry>Cb<subscript>30</subscript></entry>
- <entry>Cr<subscript>30</subscript></entry>
- <entry>Cb<subscript>31</subscript></entry>
- <entry>Cr<subscript>31</subscript></entry>
- <entry>Cb<subscript>32</subscript></entry>
- <entry>Cr<subscript>32</subscript></entry>
- <entry>Cb<subscript>33</subscript></entry>
- <entry>Cr<subscript>33</subscript></entry>
- </row>
- </tbody>
- </tgroup>
- </informaltable>
- </para>
- </formalpara>
- </example>
- </refsect1>
- </refentry>