mirror of https://gitee.com/openkylin/linux.git
121 lines
4.1 KiB
XML
121 lines
4.1 KiB
XML
<refentry id="V4L2-PIX-FMT-YUYV">
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<refmeta>
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<refentrytitle>V4L2_PIX_FMT_YUYV ('YUYV')</refentrytitle>
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&manvol;
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</refmeta>
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<refnamediv>
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<refname><constant>V4L2_PIX_FMT_YUYV</constant></refname>
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<refpurpose>Packed format with ½ horizontal chroma
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resolution, also known as YUV 4:2:2</refpurpose>
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</refnamediv>
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<refsect1>
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<title>Description</title>
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<para>In this format each four bytes is two pixels. Each four
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bytes is two Y's, a Cb and a Cr. Each Y goes to one of the pixels, and
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the Cb and Cr belong to both pixels. As you can see, the Cr and Cb
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components have half the horizontal resolution of the Y component.
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<constant>V4L2_PIX_FMT_YUYV </constant> is known in the Windows
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environment as YUY2.</para>
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<example>
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<title><constant>V4L2_PIX_FMT_YUYV</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>Cb<subscript>00</subscript></entry>
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<entry>Y'<subscript>01</subscript></entry>
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<entry>Cr<subscript>00</subscript></entry>
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<entry>Y'<subscript>02</subscript></entry>
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<entry>Cb<subscript>01</subscript></entry>
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<entry>Y'<subscript>03</subscript></entry>
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<entry>Cr<subscript>01</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>10</subscript></entry>
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<entry>Cb<subscript>10</subscript></entry>
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<entry>Y'<subscript>11</subscript></entry>
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<entry>Cr<subscript>10</subscript></entry>
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<entry>Y'<subscript>12</subscript></entry>
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<entry>Cb<subscript>11</subscript></entry>
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<entry>Y'<subscript>13</subscript></entry>
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<entry>Cr<subscript>11</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>Y'<subscript>20</subscript></entry>
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<entry>Cb<subscript>20</subscript></entry>
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<entry>Y'<subscript>21</subscript></entry>
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<entry>Cr<subscript>20</subscript></entry>
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<entry>Y'<subscript>22</subscript></entry>
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<entry>Cb<subscript>21</subscript></entry>
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<entry>Y'<subscript>23</subscript></entry>
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<entry>Cr<subscript>21</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>Y'<subscript>30</subscript></entry>
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<entry>Cb<subscript>30</subscript></entry>
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<entry>Y'<subscript>31</subscript></entry>
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<entry>Cr<subscript>30</subscript></entry>
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<entry>Y'<subscript>32</subscript></entry>
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<entry>Cb<subscript>31</subscript></entry>
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<entry>Y'<subscript>33</subscript></entry>
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<entry>Cr<subscript>31</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>Y</entry><entry>C</entry><entry>Y</entry><entry></entry>
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<entry>Y</entry><entry>C</entry><entry>Y</entry>
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</row>
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<row>
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<entry>1</entry>
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<entry>Y</entry><entry>C</entry><entry>Y</entry><entry></entry>
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<entry>Y</entry><entry>C</entry><entry>Y</entry>
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</row>
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<row>
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<entry>2</entry>
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<entry>Y</entry><entry>C</entry><entry>Y</entry><entry></entry>
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<entry>Y</entry><entry>C</entry><entry>Y</entry>
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</row>
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<row>
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<entry>3</entry>
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<entry>Y</entry><entry>C</entry><entry>Y</entry><entry></entry>
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<entry>Y</entry><entry>C</entry><entry>Y</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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