mirror of https://gitee.com/openkylin/linux.git
158 lines
5.9 KiB
XML
158 lines
5.9 KiB
XML
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<refentry id="V4L2-PIX-FMT-Y41P">
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<refmeta>
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<refentrytitle>V4L2_PIX_FMT_Y41P ('Y41P')</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_Y41P</constant></refname>
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<refpurpose>Format with ¼ horizontal chroma
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resolution, also known as YUV 4:1:1</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 12 bytes is eight pixels. In the
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twelve bytes are two CbCr pairs and eight Y's. The first CbCr pair
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goes with the first four Y's, and the second CbCr pair goes with the
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other four Y's. The Cb and Cr components have one fourth the
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horizontal resolution of the Y component.</para>
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<para>Do not confuse this format with <link
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linkend="V4L2-PIX-FMT-YUV411P"><constant>V4L2_PIX_FMT_YUV411P</constant></link>.
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Y41P is derived from "YUV 4:1:1 <emphasis>packed</emphasis>", while
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YUV411P stands for "YUV 4:1:1 <emphasis>planar</emphasis>".</para>
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<example>
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<title><constant>V4L2_PIX_FMT_Y41P</constant> 8 × 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="13" 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>Cb<subscript>00</subscript></entry>
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<entry>Y'<subscript>00</subscript></entry>
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<entry>Cr<subscript>00</subscript></entry>
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<entry>Y'<subscript>01</subscript></entry>
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<entry>Cb<subscript>01</subscript></entry>
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<entry>Y'<subscript>02</subscript></entry>
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<entry>Cr<subscript>01</subscript></entry>
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<entry>Y'<subscript>03</subscript></entry>
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<entry>Y'<subscript>04</subscript></entry>
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<entry>Y'<subscript>05</subscript></entry>
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<entry>Y'<subscript>06</subscript></entry>
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<entry>Y'<subscript>07</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>Cb<subscript>10</subscript></entry>
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<entry>Y'<subscript>10</subscript></entry>
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<entry>Cr<subscript>10</subscript></entry>
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<entry>Y'<subscript>11</subscript></entry>
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<entry>Cb<subscript>11</subscript></entry>
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<entry>Y'<subscript>12</subscript></entry>
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<entry>Cr<subscript>11</subscript></entry>
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<entry>Y'<subscript>13</subscript></entry>
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<entry>Y'<subscript>14</subscript></entry>
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<entry>Y'<subscript>15</subscript></entry>
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<entry>Y'<subscript>16</subscript></entry>
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<entry>Y'<subscript>17</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>20</subscript></entry>
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<entry>Y'<subscript>20</subscript></entry>
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<entry>Cr<subscript>20</subscript></entry>
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<entry>Y'<subscript>21</subscript></entry>
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<entry>Cb<subscript>21</subscript></entry>
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<entry>Y'<subscript>22</subscript></entry>
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<entry>Cr<subscript>21</subscript></entry>
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<entry>Y'<subscript>23</subscript></entry>
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<entry>Y'<subscript>24</subscript></entry>
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<entry>Y'<subscript>25</subscript></entry>
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<entry>Y'<subscript>26</subscript></entry>
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<entry>Y'<subscript>27</subscript></entry>
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</row>
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<row>
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<entry>start + 36:</entry>
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<entry>Cb<subscript>30</subscript></entry>
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<entry>Y'<subscript>30</subscript></entry>
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<entry>Cr<subscript>30</subscript></entry>
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<entry>Y'<subscript>31</subscript></entry>
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<entry>Cb<subscript>31</subscript></entry>
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<entry>Y'<subscript>32</subscript></entry>
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<entry>Cr<subscript>31</subscript></entry>
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<entry>Y'<subscript>33</subscript></entry>
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<entry>Y'<subscript>34</subscript></entry>
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<entry>Y'<subscript>35</subscript></entry>
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<entry>Y'<subscript>36</subscript></entry>
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<entry>Y'<subscript>37</subscript></entry>
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</row>
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</tbody>
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</tgroup>
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</informaltable></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="15" 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><entry></entry>
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<entry>4</entry><entry></entry><entry>5</entry><entry></entry>
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<entry>6</entry><entry></entry><entry>7</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></entry><entry>Y</entry><entry>C</entry>
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<entry>Y</entry><entry></entry><entry>Y</entry><entry></entry>
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<entry>Y</entry><entry></entry><entry>Y</entry><entry>C</entry>
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<entry>Y</entry><entry></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></entry><entry>Y</entry><entry>C</entry>
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<entry>Y</entry><entry></entry><entry>Y</entry><entry></entry>
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<entry>Y</entry><entry></entry><entry>Y</entry><entry>C</entry>
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<entry>Y</entry><entry></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></entry><entry>Y</entry><entry>C</entry>
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<entry>Y</entry><entry></entry><entry>Y</entry><entry></entry>
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<entry>Y</entry><entry></entry><entry>Y</entry><entry>C</entry>
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<entry>Y</entry><entry></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></entry><entry>Y</entry><entry>C</entry>
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<entry>Y</entry><entry></entry><entry>Y</entry><entry></entry>
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<entry>Y</entry><entry></entry><entry>Y</entry><entry>C</entry>
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<entry>Y</entry><entry></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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<!--
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Local Variables:
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mode: sgml
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sgml-parent-document: "pixfmt.sgml"
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indent-tabs-mode: nil
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End:
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-->
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