CooCenter-System-kernel/Documentation/DocBook/media/v4l/pixfmt-y12.xml

<refentry id="V4L2-PIX-FMT-Y12">
  <refmeta>
    <refentrytitle>V4L2_PIX_FMT_Y12 ('Y12 ')</refentrytitle>
    &manvol;
  </refmeta>
  <refnamediv>
    <refname><constant>V4L2_PIX_FMT_Y12</constant></refname>
    <refpurpose>Grey-scale image</refpurpose>
  </refnamediv>
  <refsect1>
    <title>Description</title>

    <para>This is a grey-scale image with a depth of 12 bits per pixel. Pixels
are stored in 16-bit words with unused high bits padded with 0. The least
significant byte is stored at lower memory addresses (little-endian).</para>

    <example>
      <title><constant>V4L2_PIX_FMT_Y12</constant> 4 &times; 4
pixel image</title>

      <formalpara>
	<title>Byte Order.</title>
	<para>Each cell is one byte.
	  <informaltable frame="none">
	    <tgroup cols="9" align="center">
	      <colspec align="left" colwidth="2*" />
	      <tbody valign="top">
		<row>
		  <entry>start&nbsp;+&nbsp;0:</entry>
		  <entry>Y'<subscript>00low</subscript></entry>
		  <entry>Y'<subscript>00high</subscript></entry>
		  <entry>Y'<subscript>01low</subscript></entry>
		  <entry>Y'<subscript>01high</subscript></entry>
		  <entry>Y'<subscript>02low</subscript></entry>
		  <entry>Y'<subscript>02high</subscript></entry>
		  <entry>Y'<subscript>03low</subscript></entry>
		  <entry>Y'<subscript>03high</subscript></entry>
		</row>
		<row>
		  <entry>start&nbsp;+&nbsp;8:</entry>
		  <entry>Y'<subscript>10low</subscript></entry>
		  <entry>Y'<subscript>10high</subscript></entry>
		  <entry>Y'<subscript>11low</subscript></entry>
		  <entry>Y'<subscript>11high</subscript></entry>
		  <entry>Y'<subscript>12low</subscript></entry>
		  <entry>Y'<subscript>12high</subscript></entry>
		  <entry>Y'<subscript>13low</subscript></entry>
		  <entry>Y'<subscript>13high</subscript></entry>
		</row>
		<row>
		  <entry>start&nbsp;+&nbsp;16:</entry>
		  <entry>Y'<subscript>20low</subscript></entry>
		  <entry>Y'<subscript>20high</subscript></entry>
		  <entry>Y'<subscript>21low</subscript></entry>
		  <entry>Y'<subscript>21high</subscript></entry>
		  <entry>Y'<subscript>22low</subscript></entry>
		  <entry>Y'<subscript>22high</subscript></entry>
		  <entry>Y'<subscript>23low</subscript></entry>
		  <entry>Y'<subscript>23high</subscript></entry>
		</row>
		<row>
		  <entry>start&nbsp;+&nbsp;24:</entry>
		  <entry>Y'<subscript>30low</subscript></entry>
		  <entry>Y'<subscript>30high</subscript></entry>
		  <entry>Y'<subscript>31low</subscript></entry>
		  <entry>Y'<subscript>31high</subscript></entry>
		  <entry>Y'<subscript>32low</subscript></entry>
		  <entry>Y'<subscript>32high</subscript></entry>
		  <entry>Y'<subscript>33low</subscript></entry>
		  <entry>Y'<subscript>33high</subscript></entry>
		</row>
	      </tbody>
	    </tgroup>
	  </informaltable>
	</para>
      </formalpara>
    </example>
  </refsect1>
</refentry>