178 lines
6.3 KiB
XML
178 lines
6.3 KiB
XML
<refentry>
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<refmeta>
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<refentrytitle>V4L2_PIX_FMT_YUV444M ('YM24'), V4L2_PIX_FMT_YVU444M ('YM42')</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-YUV444M"><constant>V4L2_PIX_FMT_YUV444M</constant></refname>
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<refname id="V4L2-PIX-FMT-YVU444M"><constant>V4L2_PIX_FMT_YVU444M</constant></refname>
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<refpurpose>Planar formats with full horizontal resolution, also
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known as YUV and YVU 4:4:4</refpurpose>
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</refnamediv>
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<refsect1>
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<title>Description</title>
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<para>This is a multi-planar format, as opposed to a packed format.
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The three components are separated into three sub-images or planes.</para>
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<para>The Y plane is first. The Y plane has one byte per pixel.
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For <constant>V4L2_PIX_FMT_YUV444M</constant> the Cb data
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constitutes the second plane which is the same width and height as the Y plane
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(and as the image). The Cr data, just like the Cb plane, is in the third plane.
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</para>
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<para><constant>V4L2_PIX_FMT_YVU444M</constant> is the same except
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the Cr data is stored in the second plane and the Cb data in the third plane.
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</para>
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<para>If the Y plane has pad bytes after each row, then the Cb
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and Cr planes have the same number of pad bytes after their rows.</para>
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<para><constant>V4L2_PIX_FMT_YUV444M</constant> and
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<constant>V4L2_PIX_FMT_YUV444M</constant> are intended to be
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used only in drivers and applications that support the multi-planar API,
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described in <xref linkend="planar-apis"/>. </para>
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<example>
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<title><constant>V4L2_PIX_FMT_YUV444M</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="5" 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>start0 + 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>start0 + 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>start0 + 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>start0 + 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><entry></entry></row>
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<row>
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<entry>start1 + 0:</entry>
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<entry>Cb<subscript>00</subscript></entry>
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<entry>Cb<subscript>01</subscript></entry>
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<entry>Cb<subscript>02</subscript></entry>
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<entry>Cb<subscript>03</subscript></entry>
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</row>
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<row>
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<entry>start1 + 4:</entry>
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<entry>Cb<subscript>10</subscript></entry>
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<entry>Cb<subscript>11</subscript></entry>
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<entry>Cb<subscript>12</subscript></entry>
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<entry>Cb<subscript>13</subscript></entry>
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</row>
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<row>
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<entry>start1 + 8:</entry>
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<entry>Cb<subscript>20</subscript></entry>
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<entry>Cb<subscript>21</subscript></entry>
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<entry>Cb<subscript>22</subscript></entry>
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<entry>Cb<subscript>23</subscript></entry>
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</row>
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<row>
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<entry>start1 + 12:</entry>
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<entry>Cb<subscript>20</subscript></entry>
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<entry>Cb<subscript>21</subscript></entry>
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<entry>Cb<subscript>32</subscript></entry>
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<entry>Cb<subscript>33</subscript></entry>
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</row>
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<row><entry></entry></row>
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<row>
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<entry>start2 + 0:</entry>
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<entry>Cr<subscript>00</subscript></entry>
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<entry>Cr<subscript>01</subscript></entry>
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<entry>Cr<subscript>02</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>start2 + 4:</entry>
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<entry>Cr<subscript>10</subscript></entry>
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<entry>Cr<subscript>11</subscript></entry>
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<entry>Cr<subscript>12</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>start2 + 8:</entry>
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<entry>Cr<subscript>20</subscript></entry>
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<entry>Cr<subscript>21</subscript></entry>
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<entry>Cr<subscript>22</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>start2 + 12:</entry>
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<entry>Cr<subscript>30</subscript></entry>
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<entry>Cr<subscript>31</subscript></entry>
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<entry>Cr<subscript>32</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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<formalpara>
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<title>Color Sample Location.</title>
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<para>
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<informaltable frame="none">
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<tgroup cols="7" align="center">
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<tbody valign="top">
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<row>
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<entry></entry>
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<entry>0</entry><entry></entry><entry>1</entry><entry></entry>
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<entry>2</entry><entry></entry><entry>3</entry>
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</row>
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<row>
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<entry>0</entry>
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<entry>YC</entry><entry></entry><entry>YC</entry><entry></entry>
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<entry>YC</entry><entry></entry><entry>YC</entry>
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</row>
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<row>
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<entry>1</entry>
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<entry>YC</entry><entry></entry><entry>YC</entry><entry></entry>
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<entry>YC</entry><entry></entry><entry>YC</entry>
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</row>
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<row>
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<entry>2</entry>
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<entry>YC</entry><entry></entry><entry>YC</entry><entry></entry>
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<entry>YC</entry><entry></entry><entry>YC</entry>
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</row>
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<row>
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<entry>3</entry>
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<entry>YC</entry><entry></entry><entry>YC</entry><entry></entry>
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<entry>YC</entry><entry></entry><entry>YC</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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