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- <refentry id="V4L2-PIX-FMT-Y41P">
- <refmeta>
- <refentrytitle>V4L2_PIX_FMT_Y41P ('Y41P')</refentrytitle>
- &manvol;
- </refmeta>
- <refnamediv>
- <refname><constant>V4L2_PIX_FMT_Y41P</constant></refname>
- <refpurpose>Format with &frac14; horizontal chroma
-resolution, also known as YUV 4:1:1</refpurpose>
- </refnamediv>
- <refsect1>
- <title>Description</title>
-
- <para>In this format each 12 bytes is eight pixels. In the
-twelve bytes are two CbCr pairs and eight Y's. The first CbCr pair
-goes with the first four Y's, and the second CbCr pair goes with the
-other four Y's. The Cb and Cr components have one fourth the
-horizontal resolution of the Y component.</para>
-
- <para>Do not confuse this format with <link
-linkend="V4L2-PIX-FMT-YUV411P"><constant>V4L2_PIX_FMT_YUV411P</constant></link>.
-Y41P is derived from "YUV 4:1:1 <emphasis>packed</emphasis>", while
-YUV411P stands for "YUV 4:1:1 <emphasis>planar</emphasis>".</para>
-
- <example>
- <title><constant>V4L2_PIX_FMT_Y41P</constant> 8 &times; 4
-pixel image</title>
-
- <formalpara>
- <title>Byte Order</title>
- <para>Each cell is one byte.
- <informaltable frame="none">
- <tgroup cols="13" align="center">
- <colspec align="left" colwidth="2*" />
- <tbody valign="top">
- <row>
- <entry>start&nbsp;+&nbsp;0:</entry>
- <entry>Cb<subscript>00</subscript></entry>
- <entry>Y'<subscript>00</subscript></entry>
- <entry>Cr<subscript>00</subscript></entry>
- <entry>Y'<subscript>01</subscript></entry>
- <entry>Cb<subscript>01</subscript></entry>
- <entry>Y'<subscript>02</subscript></entry>
- <entry>Cr<subscript>01</subscript></entry>
- <entry>Y'<subscript>03</subscript></entry>
- <entry>Y'<subscript>04</subscript></entry>
- <entry>Y'<subscript>05</subscript></entry>
- <entry>Y'<subscript>06</subscript></entry>
- <entry>Y'<subscript>07</subscript></entry>
- </row>
- <row>
- <entry>start&nbsp;+&nbsp;12:</entry>
- <entry>Cb<subscript>10</subscript></entry>
- <entry>Y'<subscript>10</subscript></entry>
- <entry>Cr<subscript>10</subscript></entry>
- <entry>Y'<subscript>11</subscript></entry>
- <entry>Cb<subscript>11</subscript></entry>
- <entry>Y'<subscript>12</subscript></entry>
- <entry>Cr<subscript>11</subscript></entry>
- <entry>Y'<subscript>13</subscript></entry>
- <entry>Y'<subscript>14</subscript></entry>
- <entry>Y'<subscript>15</subscript></entry>
- <entry>Y'<subscript>16</subscript></entry>
- <entry>Y'<subscript>17</subscript></entry>
- </row>
- <row>
- <entry>start&nbsp;+&nbsp;24:</entry>
- <entry>Cb<subscript>20</subscript></entry>
- <entry>Y'<subscript>20</subscript></entry>
- <entry>Cr<subscript>20</subscript></entry>
- <entry>Y'<subscript>21</subscript></entry>
- <entry>Cb<subscript>21</subscript></entry>
- <entry>Y'<subscript>22</subscript></entry>
- <entry>Cr<subscript>21</subscript></entry>
- <entry>Y'<subscript>23</subscript></entry>
- <entry>Y'<subscript>24</subscript></entry>
- <entry>Y'<subscript>25</subscript></entry>
- <entry>Y'<subscript>26</subscript></entry>
- <entry>Y'<subscript>27</subscript></entry>
- </row>
- <row>
- <entry>start&nbsp;+&nbsp;36:</entry>
- <entry>Cb<subscript>30</subscript></entry>
- <entry>Y'<subscript>30</subscript></entry>
- <entry>Cr<subscript>30</subscript></entry>
- <entry>Y'<subscript>31</subscript></entry>
- <entry>Cb<subscript>31</subscript></entry>
- <entry>Y'<subscript>32</subscript></entry>
- <entry>Cr<subscript>31</subscript></entry>
- <entry>Y'<subscript>33</subscript></entry>
- <entry>Y'<subscript>34</subscript></entry>
- <entry>Y'<subscript>35</subscript></entry>
- <entry>Y'<subscript>36</subscript></entry>
- <entry>Y'<subscript>37</subscript></entry>
- </row>
- </tbody>
- </tgroup>
- </informaltable></para>
- </formalpara>
-
- <formalpara>
- <title>Color Sample Location.</title>
- <para>
- <informaltable frame="none">
- <tgroup cols="15" align="center">
- <tbody valign="top">
- <row>
- <entry></entry>
- <entry>0</entry><entry></entry><entry>1</entry><entry></entry>
- <entry>2</entry><entry></entry><entry>3</entry><entry></entry>
- <entry>4</entry><entry></entry><entry>5</entry><entry></entry>
- <entry>6</entry><entry></entry><entry>7</entry>
- </row>
- <row>
- <entry>0</entry>
- <entry>Y</entry><entry></entry><entry>Y</entry><entry>C</entry>
- <entry>Y</entry><entry></entry><entry>Y</entry><entry></entry>
- <entry>Y</entry><entry></entry><entry>Y</entry><entry>C</entry>
- <entry>Y</entry><entry></entry><entry>Y</entry>
- </row>
- <row>
- <entry>1</entry>
- <entry>Y</entry><entry></entry><entry>Y</entry><entry>C</entry>
- <entry>Y</entry><entry></entry><entry>Y</entry><entry></entry>
- <entry>Y</entry><entry></entry><entry>Y</entry><entry>C</entry>
- <entry>Y</entry><entry></entry><entry>Y</entry>
- </row>
- <row>
- <entry>2</entry>
- <entry>Y</entry><entry></entry><entry>Y</entry><entry>C</entry>
- <entry>Y</entry><entry></entry><entry>Y</entry><entry></entry>
- <entry>Y</entry><entry></entry><entry>Y</entry><entry>C</entry>
- <entry>Y</entry><entry></entry><entry>Y</entry>
- </row>
- <row>
- <entry>3</entry>
- <entry>Y</entry><entry></entry><entry>Y</entry><entry>C</entry>
- <entry>Y</entry><entry></entry><entry>Y</entry><entry></entry>
- <entry>Y</entry><entry></entry><entry>Y</entry><entry>C</entry>
- <entry>Y</entry><entry></entry><entry>Y</entry>
- </row>
- </tbody>
- </tgroup>
- </informaltable>
- </para>
- </formalpara>
- </example>
- </refsect1>
- </refentry>