1<html><head><meta http-equiv="Content-Type" content="text/html; charset=ANSI_X3.4-1968"><title>V4L2_PIX_FMT_M420 ('M420')</title><meta name="generator" content="DocBook XSL Stylesheets V1.78.1"><link rel="home" href="index.html" title="LINUX MEDIA INFRASTRUCTURE API"><link rel="up" href="yuv-formats.html" title="YUV Formats"><link rel="prev" href="re35.html" title="V4L2_PIX_FMT_NV24 ('NV24'), V4L2_PIX_FMT_NV42 ('NV42')"><link rel="next" href="ch02s10.html" title="Compressed Formats"></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">V4L2_PIX_FMT_M420 ('M420')</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="re35.html">Prev</a> </td><th width="60%" align="center">YUV Formats</th><td width="20%" align="right"> <a accesskey="n" href="ch02s10.html">Next</a></td></tr></table><hr></div><div class="refentry"><a name="V4L2-PIX-FMT-M420"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p><code class="constant">V4L2_PIX_FMT_M420</code> — Format with ½ horizontal and vertical chroma 2 resolution, also known as YUV 4:2:0. Hybrid plane line-interleaved 3 layout.</p></div><div class="refsect1"><a name="idp1102793844"></a><h2>Description</h2><p>M420 is a YUV format with ½ horizontal and vertical chroma 4 subsampling (YUV 4:2:0). Pixels are organized as interleaved luma and 5 chroma planes. Two lines of luma data are followed by one line of chroma 6 data.</p><p>The luma plane has one byte per pixel. The chroma plane contains 7 interleaved CbCr pixels subsampled by ½ in the horizontal and 8 vertical directions. Each CbCr pair belongs to four pixels. For example, 9Cb<sub>0</sub>/Cr<sub>0</sub> belongs to 10Y'<sub>00</sub>, Y'<sub>01</sub>, 11Y'<sub>10</sub>, Y'<sub>11</sub>.</p><p>All line lengths are identical: if the Y lines include pad bytes 12 so do the CbCr lines.</p><div class="example"><a name="idp1102862116"></a><p class="title"><b>Example 2.33. <code class="constant">V4L2_PIX_FMT_M420</code> 4 × 4 13pixel image</b></p><div class="example-contents"><p><b>Byte Order. </b>Each cell is one byte. 14 </p><div class="informaltable"><table border="0"><colgroup><col align="left"><col><col><col><col></colgroup><tbody valign="top"><tr><td align="left" valign="top">start + 0:</td><td align="center" valign="top">Y'<sub>00</sub></td><td align="center" valign="top">Y'<sub>01</sub></td><td align="center" valign="top">Y'<sub>02</sub></td><td align="center" valign="top">Y'<sub>03</sub></td></tr><tr><td align="left" valign="top">start + 4:</td><td align="center" valign="top">Y'<sub>10</sub></td><td align="center" valign="top">Y'<sub>11</sub></td><td align="center" valign="top">Y'<sub>12</sub></td><td align="center" valign="top">Y'<sub>13</sub></td></tr><tr><td align="left" valign="top">start + 8:</td><td align="center" valign="top">Cb<sub>00</sub></td><td align="center" valign="top">Cr<sub>00</sub></td><td align="center" valign="top">Cb<sub>01</sub></td><td align="center" valign="top">Cr<sub>01</sub></td></tr><tr><td align="left" valign="top">start + 16:</td><td align="center" valign="top">Y'<sub>20</sub></td><td align="center" valign="top">Y'<sub>21</sub></td><td align="center" valign="top">Y'<sub>22</sub></td><td align="center" valign="top">Y'<sub>23</sub></td></tr><tr><td align="left" valign="top">start + 20:</td><td align="center" valign="top">Y'<sub>30</sub></td><td align="center" valign="top">Y'<sub>31</sub></td><td align="center" valign="top">Y'<sub>32</sub></td><td align="center" valign="top">Y'<sub>33</sub></td></tr><tr><td align="left" valign="top">start + 24:</td><td align="center" valign="top">Cb<sub>10</sub></td><td align="center" valign="top">Cr<sub>10</sub></td><td align="center" valign="top">Cb<sub>11</sub></td><td align="center" valign="top">Cr<sub>11</sub></td></tr></tbody></table></div><p> 15 </p><p><b>Color Sample Location. </b> 16 </p><div class="informaltable"><table border="0"><colgroup><col><col><col><col><col><col><col></colgroup><tbody valign="top"><tr><td align="center" valign="top"> </td><td align="center" valign="top">0</td><td align="center" valign="top"> </td><td align="center" valign="top">1</td><td align="center" valign="top"> </td><td align="center" valign="top">2</td><td align="center" valign="top"> </td><td align="center" valign="top">3</td></tr><tr><td align="center" valign="top">0</td><td align="center" valign="top">Y</td><td align="center" valign="top"> </td><td align="center" valign="top">Y</td><td align="center" valign="top"> </td><td align="center" valign="top">Y</td><td align="center" valign="top"> </td><td align="center" valign="top">Y</td></tr><tr><td align="center" valign="top"> </td><td align="center" valign="top"> </td><td align="center" valign="top">C</td><td align="center" valign="top"> </td><td align="center" valign="top"> </td><td align="center" valign="top"> </td><td align="center" valign="top">C</td><td align="center" valign="top"> </td></tr><tr><td align="center" valign="top">1</td><td align="center" valign="top">Y</td><td align="center" valign="top"> </td><td align="center" valign="top">Y</td><td align="center" valign="top"> </td><td align="center" valign="top">Y</td><td align="center" valign="top"> </td><td align="center" valign="top">Y</td></tr><tr><td align="center" valign="top"> </td><td class="auto-generated"> </td><td class="auto-generated"> </td><td class="auto-generated"> </td><td class="auto-generated"> </td><td class="auto-generated"> </td><td class="auto-generated"> </td></tr><tr><td align="center" valign="top">2</td><td align="center" valign="top">Y</td><td align="center" valign="top"> </td><td align="center" valign="top">Y</td><td align="center" valign="top"> </td><td align="center" valign="top">Y</td><td align="center" valign="top"> </td><td align="center" valign="top">Y</td></tr><tr><td align="center" valign="top"> </td><td align="center" valign="top"> </td><td align="center" valign="top">C</td><td align="center" valign="top"> </td><td align="center" valign="top"> </td><td align="center" valign="top"> </td><td align="center" valign="top">C</td><td align="center" valign="top"> </td></tr><tr><td align="center" valign="top">3</td><td align="center" valign="top">Y</td><td align="center" valign="top"> </td><td align="center" valign="top">Y</td><td align="center" valign="top"> </td><td align="center" valign="top">Y</td><td align="center" valign="top"> </td><td align="center" valign="top">Y</td></tr></tbody></table></div><p> 17 </p></div></div><br class="example-break"></div></div><div class="navfooter"><hr><table width="100%" summary="Navigation 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