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authorFathi Boudra <fathi.boudra@linaro.org>2013-04-28 09:33:08 +0300
committerFathi Boudra <fathi.boudra@linaro.org>2013-04-28 09:33:08 +0300
commit3b4bd47f8f4ed3aaf7c81c9b5d2d37ad79fadf4a (patch)
treeb9996006addfd7ae70a39672b76843b49aebc189 /Documentation/DocBook/media/v4l/pixfmt-y41p.xml
downloadlinux-linaro-highbank-3b4bd47f8f4ed3aaf7c81c9b5d2d37ad79fadf4a.tar.gz
Imported Upstream version 3.9.0HEADupstream/3.9.0upstreammaster
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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>