[media] DocBook: V4L: add V4L2_SDR_FMT_RU12LE - 'RU12'

<refentry id="V4L2-SDR-FMT-RU12LE">

  <refmeta>

    <refentrytitle>V4L2_SDR_FMT_RU12LE ('RU12')</refentrytitle>

    &manvol;

  </refmeta>

    <refnamediv>

      <refname>

        <constant>V4L2_SDR_FMT_RU12LE</constant>

      </refname>

      <refpurpose>Real unsigned 12-bit little endian sample</refpurpose>

    </refnamediv>

    <refsect1>

      <title>Description</title>

      <para>

This format contains sequence of real number samples. Each sample is

represented as a 12 bit unsigned little endian number. Sample is stored

in 16 bit space with unused high bits padded with 0.

      </para>

    <example>

      <title><constant>V4L2_SDR_FMT_RU12LE</constant> 1 sample</title>

      <formalpara>

        <title>Byte Order.</title>

        <para>Each cell is one byte.

          <informaltable frame="none">

            <tgroup cols="3" align="center">

              <colspec align="left" colwidth="2*" />

              <tbody valign="top">

                <row>

                  <entry>start&nbsp;+&nbsp;0:</entry>

                  <entry>I'<subscript>0[7:0]</subscript></entry>

                  <entry>I'<subscript>0[11:8]</subscript></entry>

                </row>

              </tbody>

            </tgroup>

          </informaltable>

        </para>

      </formalpara>

    </example>

  </refsect1>

</refentry>

    &sub-sdr-cu08;

    &sub-sdr-cu16le;

    &sub-sdr-ru12le;

  </section>