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Lennart Poettering 2004-09-07 22:40:43 +00:00
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>polypaudio: FAQ</title>
<link rel="stylesheet" type="text/css" href="style.css" />
</head>
<body>
<h1>Frequently Asked Questions</h1>
<ol>
<li><p><b>How does Polypaudio compare with ESOUND/aRts/NAS?</b></p>
<p>Polypaudio is sound daemon similar to ESOUND and NAS, but much more
powerful. aRts is a realtime-synthesizer-cum-sound-server, i.e. it
does much more than Polypaudio. However, I believe that Polypaudio
does what it does much better than any other free sound server.</p>
</li>
<li><p><b>What about ESOUND compatibility?</b></p>
<p>Polypaudio is a drop in replacement for ESOUND. That means: you can
load a esound compatibility module which implements an ESOUND
compatible protocol which allows you to use most of the classic ESOUND
compatible programs (including the command line programs like
<tt>esdcat</tt>).</p>
</li>
<li><p><b>Is Polypaudio a GNOME program?</b></p>
<p>No, Polypaudio has no dependency on GNOME/GTK/GLIB. All it requires
is a UNIX-like operating system and very few dependency
libraries. However, the accompanying GUI tools are writen with
gtkmm, i.e. require both GLIB and GTK.</p></li>
<li><p><b>Can I integrate Polypaudio in my GLIB/GTK/GNOME application?</b></p>
<p>Yes! Polypaudio comes with a GLIB main loop adapter. You can embed
both the client library and the daemon (!) into your GLIB based
application.</p></li>
<li><p><b>Can I integrate Polypaudio in my Qt/KDE application?</b></p>
<p>Yes! Polypaudio uses a main loop abstraction layer that allows you
to integrate Polypaudio in any program that supports main
loops. Unfortunately there is no adapter for Qt publicly available yet.</p></li>
<li><p><b>I want to write a new driver for Polypaudio, are there any docs?</b></p>
<p>Currently, only the client API is documented with doxygen. Read
the source and base your work on a simple module like
<tt>module-pipe-sink</tt>.</p></li>
<li><p><b>What about compatibility with NAS?</b></p>
<p>Is not available (yet?). It is doable, but noone has implemented it yet.</p></li>
<li><p><b>What about compatibility with aRts?</b></p>
<p>Is not available. Since aRts is as synthesizer application you'd have to
reimplement very much code for Polypaudio. It should be easy to
implement limited support for <tt>libartsc</tt> based
applications. Noone has done this yet. It is probably a better idea to
run <tt>arts</tt> on top of Polypaudio (through a polypaudio driver
for aRts, which nobody has written yet). Another solution would be to
embed Polypaudio in the aRts process.</p></li>
<li><p><b>I often hear noises when playing back with Polypaudio, what can I do?</b></p>
<p>There are to possible solutions: either make the polypaudio
binary SUID root (<tt>chmod u+s /usr/bin/polypaudio</tt>) and run it
with argument <tt>-r</tt> or increase the fragment sizes of the audio
drivers. The former will allow Polypaudio to activate
<tt>SCHED_FIFO</tt> high priority scheduling (root rights are dropped
immediately after this).</p></li>
</ol>
<hr/>
<address class="grey">Lennart Poettering &lt;@PACKAGE_BUGREPORT@&gt;, September 2004</address>
<div class="grey"><i>$Id$</i></div>
</body> </html>