? doc.diff
Index: codecs.xml
===================================================================
RCS file: /cvsroot/mplayer/main/DOCS/xml/en/codecs.xml,v
retrieving revision 1.74
diff -u -r1.74 codecs.xml
--- codecs.xml	5 Jan 2006 23:32:17 -0000	1.74
+++ codecs.xml	16 Jan 2006 21:08:40 -0000
@@ -780,6 +780,17 @@
 </para>
 </sect2>
 
+<sect2 id="hwmpa">
+<title>Hardware MPEG audio codec</title>
+
+<para>
+This codec passes through MPEG audio packets to hardare decoders, such as the ones
+found in full-featured DVB card and DXR2 adapters.
+Don't use it in combination with any other audio output devices (such as OSS and ALSA)
+or you will risk to damage your sound equipment.
+</para>
+</sect2>
+
 
 <sect2 id="vivo-audio">
 <title>VIVO audio</title>
Index: usage.xml
===================================================================
RCS file: /cvsroot/mplayer/main/DOCS/xml/en/usage.xml,v
retrieving revision 1.34
diff -u -r1.34 usage.xml
--- usage.xml	26 Sep 2005 06:04:14 -0000	1.34
+++ usage.xml	16 Jan 2006 21:08:40 -0000
@@ -504,6 +504,27 @@
 
 </sect3>
 
+<sect3 id="hwmpa-surround-passthrough">
+<title>MPEG audio Passthrough</title>
+
+<para>
+Digital TV transmissions (such as DVB and ATSC) and some DVDs usually have MPEG audio streams 
+(in particulat MP2).
+Some MPEG hardware decoders such as full-featured DVB cards and DXR2 adapters can natively 
+decode this format. <application>MPlayer</application> can be
+configured to relay the audio data without decoding it.
+Use -ac 
+</para>
+
+<itemizedlist>
+<title>To enable passthrough on the command line:</title>
+<listitem>
+<para>
+ <option>-ac hwmpa</option>
+</para>
+</listitem>
+</itemizedlist>
+</sect3>
 
 <sect3 id="advaudio-surround-matrix">
 <title>Matrix-encoded audio</title>