Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / Documentation / DocBook / media / v4l / pixfmt-nv12.xml

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+    <refentry>
+      <refmeta>
+       <refentrytitle>V4L2_PIX_FMT_NV12 ('NV12'), V4L2_PIX_FMT_NV21 ('NV21')</refentrytitle>
+       &manvol;
+      </refmeta>
+      <refnamediv>
+       <refname id="V4L2-PIX-FMT-NV12"><constant>V4L2_PIX_FMT_NV12</constant></refname>
+       <refname id="V4L2-PIX-FMT-NV21"><constant>V4L2_PIX_FMT_NV21</constant></refname>
+       <refpurpose>Formats with &frac12; horizontal and vertical
+chroma resolution, also known as YUV 4:2:0. One luminance and one
+chrominance plane with alternating chroma samples as opposed to
+<constant>V4L2_PIX_FMT_YVU420</constant></refpurpose>
+      </refnamediv>
+      <refsect1>
+       <title>Description</title>
+
+       <para>These are two-plane versions of the YUV 4:2:0 format.
+The three components are separated into two sub-images or planes. The
+Y plane is first. The Y plane has one byte per pixel. For
+<constant>V4L2_PIX_FMT_NV12</constant>, a combined CbCr plane
+immediately follows the Y plane in memory.  The CbCr plane is the same
+width, in bytes, as the Y plane (and of the image), but is half as
+tall in pixels. Each CbCr pair belongs to four pixels. For example,
+Cb<subscript>0</subscript>/Cr<subscript>0</subscript> belongs to
+Y'<subscript>00</subscript>, Y'<subscript>01</subscript>,
+Y'<subscript>10</subscript>, Y'<subscript>11</subscript>.
+<constant>V4L2_PIX_FMT_NV21</constant> is the same except the Cb and
+Cr bytes are swapped, the CrCb plane starts with a Cr byte.</para>
+
+       <para>If the Y plane has pad bytes after each row, then the
+CbCr plane has as many pad bytes after its rows.</para>
+
+       <example>
+         <title><constant>V4L2_PIX_FMT_NV12</constant> 4 &times; 4
+pixel image</title>
+
+         <formalpara>
+           <title>Byte Order.</title>
+           <para>Each cell is one byte.
+               <informaltable frame="none">
+               <tgroup cols="5" align="center">
+                 <colspec align="left" colwidth="2*" />
+                 <tbody valign="top">
+                   <row>
+                     <entry>start&nbsp;+&nbsp;0:</entry>
+                     <entry>Y'<subscript>00</subscript></entry>
+                     <entry>Y'<subscript>01</subscript></entry>
+                     <entry>Y'<subscript>02</subscript></entry>
+                     <entry>Y'<subscript>03</subscript></entry>
+                   </row>
+                   <row>
+                     <entry>start&nbsp;+&nbsp;4:</entry>
+                     <entry>Y'<subscript>10</subscript></entry>
+                     <entry>Y'<subscript>11</subscript></entry>
+                     <entry>Y'<subscript>12</subscript></entry>
+                     <entry>Y'<subscript>13</subscript></entry>
+                   </row>
+                   <row>
+                     <entry>start&nbsp;+&nbsp;8:</entry>
+                     <entry>Y'<subscript>20</subscript></entry>
+                     <entry>Y'<subscript>21</subscript></entry>
+                     <entry>Y'<subscript>22</subscript></entry>
+                     <entry>Y'<subscript>23</subscript></entry>
+                   </row>
+                   <row>
+                     <entry>start&nbsp;+&nbsp;12:</entry>
+                     <entry>Y'<subscript>30</subscript></entry>
+                     <entry>Y'<subscript>31</subscript></entry>
+                     <entry>Y'<subscript>32</subscript></entry>
+                     <entry>Y'<subscript>33</subscript></entry>
+                   </row>
+                   <row>
+                     <entry>start&nbsp;+&nbsp;16:</entry>
+                     <entry>Cb<subscript>00</subscript></entry>
+                     <entry>Cr<subscript>00</subscript></entry>
+                     <entry>Cb<subscript>01</subscript></entry>
+                     <entry>Cr<subscript>01</subscript></entry>
+                   </row>
+                   <row>
+                     <entry>start&nbsp;+&nbsp;20:</entry>
+                     <entry>Cb<subscript>10</subscript></entry>
+                     <entry>Cr<subscript>10</subscript></entry>
+                     <entry>Cb<subscript>11</subscript></entry>
+                     <entry>Cr<subscript>11</subscript></entry>
+                   </row>
+                 </tbody>
+               </tgroup>
+               </informaltable>
+             </para>
+         </formalpara>
+
+         <formalpara>
+           <title>Color Sample Location.</title>
+           <para>
+               <informaltable frame="none">
+               <tgroup cols="7" 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>
+                   </row>
+                   <row>
+                     <entry>0</entry>
+                     <entry>Y</entry><entry></entry><entry>Y</entry><entry></entry>
+                     <entry>Y</entry><entry></entry><entry>Y</entry>
+                   </row>
+                   <row>
+                     <entry></entry>
+                     <entry></entry><entry>C</entry><entry></entry><entry></entry>
+                     <entry></entry><entry>C</entry><entry></entry>
+                   </row>
+                   <row>
+                     <entry>1</entry>
+                     <entry>Y</entry><entry></entry><entry>Y</entry><entry></entry>
+                     <entry>Y</entry><entry></entry><entry>Y</entry>
+                   </row>
+                   <row>
+                     <entry></entry>
+                   </row>
+                   <row>
+                     <entry>2</entry>
+                     <entry>Y</entry><entry></entry><entry>Y</entry><entry></entry>
+                     <entry>Y</entry><entry></entry><entry>Y</entry>
+                   </row>
+                   <row>
+                     <entry></entry>
+                     <entry></entry><entry>C</entry><entry></entry><entry></entry>
+                     <entry></entry><entry>C</entry><entry></entry>
+                   </row>
+                   <row>
+                     <entry>3</entry>
+                     <entry>Y</entry><entry></entry><entry>Y</entry><entry></entry>
+                     <entry>Y</entry><entry></entry><entry>Y</entry>
+                   </row>
+                 </tbody>
+               </tgroup>
+               </informaltable>
+             </para>
+         </formalpara>
+       </example>
+      </refsect1>
+    </refentry>