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+     <title>RDS Interface</title>
+
+      <para>The Radio Data System transmits supplementary
+information in binary format, for example the station name or travel
+information, on a inaudible audio subcarrier of a radio program. This
+interface aims at devices capable of receiving and decoding RDS
+information.</para>
+
+      <para>The V4L API defines its RDS API as follows.</para>
+
+      <para>From radio devices supporting it, RDS data can be read
+with the &func-read; function. The data is packed in groups of three,
+as follows:<orderedlist>
+      <listitem>
+	<para>First Octet Least Significant Byte of RDS Block</para>
+      </listitem>
+      <listitem>
+	<para>Second Octet Most Significant Byte of RDS Block</para>
+      </listitem>
+      <listitem>
+	<para>Third Octet Bit 7: Error bit. Indicates that an
+uncorrectable error occurred during reception of this block. Bit 6:
+Corrected bit. Indicates that an error was corrected for this data
+block. Bits 5-3: Received Offset. Indicates the offset received by the
+sync system. Bits 2-0: Offset Name. Indicates the offset applied to
+this data.</para>
+      </listitem>
+	</orderedlist></para>
+
+      <para>It was argued <!-- video4linux-list@redhat.com
+on 12 Nov 2002, subject "RDS/RBDS" --> the RDS API should be
+extended before integration into V4L2, no new API has been devised yet.
+Please write to the linux-media mailing list for discussion: &v4l-ml;.
+Meanwhile no V4L2 driver should set the
+<constant>V4L2_CAP_RDS_CAPTURE</constant> capability flag.</para>
+
+
+<!--
+Local Variables:
+mode: sgml
+sgml-parent-document: "v4l2.sgml"
+indent-tabs-mode: nil
+End:
+ -->