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+<refentry id="vidioc-g-jpegcomp">
+  <refmeta>
+    <refentrytitle>ioctl VIDIOC_G_JPEGCOMP, VIDIOC_S_JPEGCOMP</refentrytitle>
+    &manvol;
+  </refmeta>
+
+  <refnamediv>
+    <refname>VIDIOC_G_JPEGCOMP</refname>
+    <refname>VIDIOC_S_JPEGCOMP</refname>
+    <refpurpose></refpurpose>
+  </refnamediv>
+
+  <refsynopsisdiv>
+    <funcsynopsis>
+      <funcprototype>
+        <funcdef>int <function>ioctl</function></funcdef>
+        <paramdef>int <parameter>fd</parameter></paramdef>
+        <paramdef>int <parameter>request</parameter></paramdef>
+        <paramdef>v4l2_jpegcompression *<parameter>argp</parameter></paramdef>
+      </funcprototype>
+    </funcsynopsis>
+    <funcsynopsis>
+      <funcprototype>
+        <funcdef>int <function>ioctl</function></funcdef>
+        <paramdef>int <parameter>fd</parameter></paramdef>
+        <paramdef>int <parameter>request</parameter></paramdef>
+        <paramdef>const v4l2_jpegcompression *<parameter>argp</parameter></paramdef>
+      </funcprototype>
+    </funcsynopsis>
+  </refsynopsisdiv>
+
+  <refsect1>
+    <title>Arguments</title>
+
+    <variablelist>
+      <varlistentry>
+        <term><parameter>fd</parameter></term>
+        <listitem>
+          <para>&fd;</para>
+        </listitem>
+      </varlistentry>
+      <varlistentry>
+        <term><parameter>request</parameter></term>
+        <listitem>
+          <para>VIDIOC_G_JPEGCOMP, VIDIOC_S_JPEGCOMP</para>
+        </listitem>
+      </varlistentry>
+      <varlistentry>
+        <term><parameter>argp</parameter></term>
+        <listitem>
+          <para></para>
+        </listitem>
+      </varlistentry>
+    </variablelist>
+  </refsect1>
+
+  <refsect1>
+    <title>Description</title>
+
+    <para>[to do]</para>
+
+    <para>Ronald Bultje elaborates:</para>
+
+    <!-- See video4linux-list@redhat.com on 16 Oct 2002, subject
+"Re: [V4L] Re: v4l2 api / Zoran v4l2_jpegcompression" -->
+
+    <para>APP is some application-specific information. The
+application can set it itself, and it'll be stored in the JPEG-encoded
+fields (eg; interlacing information for in an AVI or so). COM is the
+same, but it's comments, like 'encoded by me' or so.</para>
+
+    <para>jpeg_markers describes whether the huffman tables,
+quantization tables and the restart interval information (all
+JPEG-specific stuff) should be stored in the JPEG-encoded fields.
+These define how the JPEG field is encoded. If you omit them,
+applications assume you've used standard encoding. You usually do want
+to add them.</para>
+
+    <!-- NB VIDIOC_S_JPEGCOMP is w/o. -->
+
+    <table pgwide="1" frame="none" id="v4l2-jpegcompression">
+      <title>struct <structname>v4l2_jpegcompression</structname></title>
+      <tgroup cols="3">
+        &cs-str;
+        <tbody valign="top">
+          <row>
+            <entry>int</entry>
+            <entry><structfield>quality</structfield></entry>
+            <entry></entry>
+          </row>
+          <row>
+            <entry>int</entry>
+            <entry><structfield>APPn</structfield></entry>
+            <entry></entry>
+          </row>
+          <row>
+            <entry>int</entry>
+            <entry><structfield>APP_len</structfield></entry>
+            <entry></entry>
+          </row>
+          <row>
+            <entry>char</entry>
+            <entry><structfield>APP_data</structfield>[60]</entry>
+            <entry></entry>
+          </row>
+          <row>
+            <entry>int</entry>
+            <entry><structfield>COM_len</structfield></entry>
+            <entry></entry>
+          </row>
+          <row>
+            <entry>char</entry>
+            <entry><structfield>COM_data</structfield>[60]</entry>
+            <entry></entry>
+          </row>
+          <row>
+            <entry>__u32</entry>
+            <entry><structfield>jpeg_markers</structfield></entry>
+            <entry>See <xref linkend="jpeg-markers" />.</entry>
+          </row>
+        </tbody>
+      </tgroup>
+    </table>
+
+    <table pgwide="1" frame="none" id="jpeg-markers">
+      <title>JPEG Markers Flags</title>
+      <tgroup cols="3">
+        &cs-def;
+        <tbody valign="top">
+          <row>
+            <entry><constant>V4L2_JPEG_MARKER_DHT</constant></entry>
+            <entry>(1&lt;&lt;3)</entry>
+            <entry>Define Huffman Tables</entry>
+          </row>
+          <row>
+            <entry><constant>V4L2_JPEG_MARKER_DQT</constant></entry>
+            <entry>(1&lt;&lt;4)</entry>
+            <entry>Define Quantization Tables</entry>
+          </row>
+          <row>
+            <entry><constant>V4L2_JPEG_MARKER_DRI</constant></entry>
+            <entry>(1&lt;&lt;5)</entry>
+            <entry>Define Restart Interval</entry>
+          </row>
+          <row>
+            <entry><constant>V4L2_JPEG_MARKER_COM</constant></entry>
+            <entry>(1&lt;&lt;6)</entry>
+            <entry>Comment segment</entry>
+          </row>
+          <row>
+            <entry><constant>V4L2_JPEG_MARKER_APP</constant></entry>
+            <entry>(1&lt;&lt;7)</entry>
+            <entry>App segment, driver will always use APP0</entry>
+          </row>
+        </tbody>
+      </tgroup>
+    </table>
+  </refsect1>
+
+  <refsect1>
+    &return-value;
+  </refsect1>
+</refentry>