| <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 × 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 + 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>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 + 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 + 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 + 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> |
