122 lines
4.7 KiB
XML
122 lines
4.7 KiB
XML
<refentry>
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<refmeta>
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<refentrytitle>V4L2_PIX_FMT_NV24 ('NV24'), V4L2_PIX_FMT_NV42 ('NV42')</refentrytitle>
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&manvol;
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</refmeta>
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<refnamediv>
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<refname id="V4L2-PIX-FMT-NV24"><constant>V4L2_PIX_FMT_NV24</constant></refname>
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<refname id="V4L2-PIX-FMT-NV42"><constant>V4L2_PIX_FMT_NV42</constant></refname>
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<refpurpose>Formats with full horizontal and vertical
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chroma resolutions, also known as YUV 4:4:4. One luminance and one
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chrominance plane with alternating chroma samples as opposed to
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<constant>V4L2_PIX_FMT_YVU420</constant></refpurpose>
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</refnamediv>
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<refsect1>
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<title>Description</title>
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<para>These are two-plane versions of the YUV 4:4:4 format. The three
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components are separated into two sub-images or planes. The Y plane is
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first, with each Y sample stored in one byte per pixel. For
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<constant>V4L2_PIX_FMT_NV24</constant>, a combined CbCr plane
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immediately follows the Y plane in memory. The CbCr plane has the same
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width and height, in pixels, as the Y plane (and the image). Each line
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contains one CbCr pair per pixel, with each Cb and Cr sample stored in
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one byte. <constant>V4L2_PIX_FMT_NV42</constant> is the same except that
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the Cb and Cr samples are swapped, the CrCb plane starts with a Cr
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sample.</para>
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<para>If the Y plane has pad bytes after each row, then the CbCr plane
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has twice as many pad bytes after its rows.</para>
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<example>
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<title><constant>V4L2_PIX_FMT_NV24</constant> 4 × 4
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pixel image</title>
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<formalpara>
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<title>Byte Order.</title>
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<para>Each cell is one byte.
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<informaltable frame="none">
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<tgroup cols="9" align="center">
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<colspec align="left" colwidth="2*" />
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<tbody valign="top">
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<row>
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<entry>start + 0:</entry>
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<entry>Y'<subscript>00</subscript></entry>
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<entry>Y'<subscript>01</subscript></entry>
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<entry>Y'<subscript>02</subscript></entry>
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<entry>Y'<subscript>03</subscript></entry>
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</row>
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<row>
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<entry>start + 4:</entry>
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<entry>Y'<subscript>10</subscript></entry>
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<entry>Y'<subscript>11</subscript></entry>
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<entry>Y'<subscript>12</subscript></entry>
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<entry>Y'<subscript>13</subscript></entry>
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</row>
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<row>
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<entry>start + 8:</entry>
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<entry>Y'<subscript>20</subscript></entry>
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<entry>Y'<subscript>21</subscript></entry>
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<entry>Y'<subscript>22</subscript></entry>
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<entry>Y'<subscript>23</subscript></entry>
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</row>
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<row>
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<entry>start + 12:</entry>
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<entry>Y'<subscript>30</subscript></entry>
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<entry>Y'<subscript>31</subscript></entry>
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<entry>Y'<subscript>32</subscript></entry>
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<entry>Y'<subscript>33</subscript></entry>
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</row>
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<row>
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<entry>start + 16:</entry>
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<entry>Cb<subscript>00</subscript></entry>
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<entry>Cr<subscript>00</subscript></entry>
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<entry>Cb<subscript>01</subscript></entry>
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<entry>Cr<subscript>01</subscript></entry>
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<entry>Cb<subscript>02</subscript></entry>
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<entry>Cr<subscript>02</subscript></entry>
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<entry>Cb<subscript>03</subscript></entry>
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<entry>Cr<subscript>03</subscript></entry>
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</row>
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<row>
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<entry>start + 24:</entry>
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<entry>Cb<subscript>10</subscript></entry>
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<entry>Cr<subscript>10</subscript></entry>
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<entry>Cb<subscript>11</subscript></entry>
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<entry>Cr<subscript>11</subscript></entry>
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<entry>Cb<subscript>12</subscript></entry>
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<entry>Cr<subscript>12</subscript></entry>
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<entry>Cb<subscript>13</subscript></entry>
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<entry>Cr<subscript>13</subscript></entry>
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</row>
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<row>
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<entry>start + 32:</entry>
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<entry>Cb<subscript>20</subscript></entry>
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<entry>Cr<subscript>20</subscript></entry>
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<entry>Cb<subscript>21</subscript></entry>
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<entry>Cr<subscript>21</subscript></entry>
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<entry>Cb<subscript>22</subscript></entry>
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<entry>Cr<subscript>22</subscript></entry>
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<entry>Cb<subscript>23</subscript></entry>
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<entry>Cr<subscript>23</subscript></entry>
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</row>
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<row>
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<entry>start + 40:</entry>
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<entry>Cb<subscript>30</subscript></entry>
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<entry>Cr<subscript>30</subscript></entry>
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<entry>Cb<subscript>31</subscript></entry>
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<entry>Cr<subscript>31</subscript></entry>
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<entry>Cb<subscript>32</subscript></entry>
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<entry>Cr<subscript>32</subscript></entry>
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<entry>Cb<subscript>33</subscript></entry>
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<entry>Cr<subscript>33</subscript></entry>
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</row>
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</tbody>
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</tgroup>
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</informaltable>
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</para>
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</formalpara>
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</example>
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</refsect1>
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</refentry>
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