1<html><head><meta http-equiv="Content-Type" content="text/html; charset=ANSI_X3.4-1968"><title>V4L2_PIX_FMT_NV12M ('NM12'), V4L2_PIX_FMT_NV21M ('NM21'), V4L2_PIX_FMT_NV12MT_16X16</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="re30.html" title="V4L2_PIX_FMT_NV12 ('NV12'), V4L2_PIX_FMT_NV21 ('NV21')"><link rel="next" href="re32.html" title="V4L2_PIX_FMT_NV12MT ('TM12')"></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_NV12M ('NM12'), V4L2_PIX_FMT_NV21M ('NM21'), V4L2_PIX_FMT_NV12MT_16X16</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="re30.html">Prev</a> </td><th width="60%" align="center">YUV Formats</th><td width="20%" align="right"> <a accesskey="n" href="re32.html">Next</a></td></tr></table><hr></div><div class="refentry"><a name="idp1102513484"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p><code class="constant">V4L2_PIX_FMT_NV12M</code>, <code class="constant">V4L2_PIX_FMT_NV21M</code>, <code class="constant">V4L2_PIX_FMT_NV12MT_16X16</code> — Variation of <code class="constant">V4L2_PIX_FMT_NV12</code> and <code class="constant">V4L2_PIX_FMT_NV21</code> with planes 2 non contiguous in memory. </p></div><div class="refsect1"><a name="idp1102512316"></a><h2>Description</h2><p>This is a multi-planar, two-plane version of the YUV 4:2:0 format. 3The three components are separated into two sub-images or planes. 4<code class="constant">V4L2_PIX_FMT_NV12M</code> differs from <code class="constant">V4L2_PIX_FMT_NV12 5</code> in that the two planes are non-contiguous in memory, i.e. the chroma 6plane do not necessarily immediately follows the luma plane. 7The luminance data occupies the first plane. The Y plane has one byte per pixel. 8In the second plane there is a chrominance data with alternating chroma samples. 9The CbCr plane is the same width, in bytes, as the Y plane (and of the image), 10but is half as tall in pixels. Each CbCr pair belongs to four pixels. For example, 11Cb<sub>0</sub>/Cr<sub>0</sub> belongs to 12Y'<sub>00</sub>, Y'<sub>01</sub>, 13Y'<sub>10</sub>, Y'<sub>11</sub>. 14<code class="constant">V4L2_PIX_FMT_NV12MT_16X16</code> is the tiled version of 15<code class="constant">V4L2_PIX_FMT_NV12M</code> with 16x16 macroblock tiles. Here pixels 16are arranged in 16x16 2D tiles and tiles are arranged in linear order in memory. 17<code class="constant">V4L2_PIX_FMT_NV21M</code> is the same as <code class="constant">V4L2_PIX_FMT_NV12M</code> 18except the Cb and Cr bytes are swapped, the CrCb plane starts with a Cr byte.</p><p><code class="constant">V4L2_PIX_FMT_NV12M</code> is intended to be 19used only in drivers and applications that support the multi-planar API, 20described in <a class="xref" href="planar-apis.html" title="Single- and multi-planar APIs">the section called “Single- and multi-planar APIs”</a>. </p><p>If the Y plane has pad bytes after each row, then the 21CbCr plane has as many pad bytes after its rows.</p><div class="example"><a name="idp1102579452"></a><p class="title"><b>Example 2.28. <code class="constant">V4L2_PIX_FMT_NV12M</code> 4 × 4 pixel image</b></p><div class="example-contents"><p><b>Byte Order. </b>Each cell is one byte. 22 </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">start0 + 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">start0 + 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">start0 + 8:</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">start0 + 12:</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"> </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="left" valign="top">start1 + 0:</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">start1 + 4:</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> 23 </p><p><b>Color Sample Location. </b> 24 </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> 25 </p></div></div><br class="example-break"></div></div><div class="navfooter"><hr><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="re30.html">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="yuv-formats.html">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="re32.html">Next</a></td></tr><tr><td width="40%" align="left" 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