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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<meta content="text/html; charset=ISO-8859-2"
http-equiv="content-type">
<title>LiveSupport Software Architecture</title>
<meta content="Akos Maroy" name="author">
</head>
<body>
<h1>Preface</h1>
This document is part of the <a href="http://livesupport.campware.org/">LiveSupport</a>
project, Copyright &#169; 2004 <a href="http://www.mdlf.org/">Media
Development Loan Fund</a>, under the GNU <a
href="http://www.gnu.org/licenses/gpl.html">GPL</a>.<br>
<ul>
<li>Author: $Author: maroy $</li>
<li>Version: $Revision: 1.1 $</li>
<li>Location: $Source: /home/paul/cvs2svn-livesupport/newcvsrepo/livesupport/doc/model/SoftwareArchitecture/index.html,v $</li>
</ul>
<h1>Scope</h1>
This document describes the software architecture of LiveSupport.<br>
<br>
This document contains embedded <a
href="http://www.w3.org/Graphics/SVG/">SVG</a> figures, thus an SVG
capable browser is needed to view it, or an SVG plugin like <a
href="http://www.adobe.com/svg/">Adobe's SVG Viewer</a>.<br>
<h1>Software Architecture</h1>
The software architecture is <a href="SoftwareArchitecture.zuml">contained</a>
in <a href="http://www.gentleware.com/products/descriptions/ce.php4">Poseidon
2</a> format.<br>
<h2>Scheduler</h2>
The software architecture for the Scheduler component:<br>
<object type="image/svg+xml" name="Scheduler Architecture"
data="SchedulerArchitecture.svg" width="950" height="550"></object>
<br>
<h2>Playlist editor</h2>
The software architecture for the Playlist Editor:<br>
<object type="image/svg+xml" name="PlaylistEditor Architecture"
data="PlaylistEditorArchitecture.svg" width="800" height="550"></object>
<br>
<h1>Components</h1>
A brief summary of the software components appearing in the figures
above:<br>
<h2>Scheduler</h2>
The LiveSupport Scheduler, responsible for executing playlists.<br>
<h2>Playlist editor</h2>
The LiveSupport Playlist editor, a graphical user interface component.<br>
<h2>Media Archive</h2>
The LiveSupport Media Archive component.<br>
<h2>Local storage</h2>
The LiveSupport Local Storage component.<br>
<h2>Helix Client Library</h2>
A media library developed by the <a href="https://helixcommunity.org/">Helix
Community</a> and <a href="http://www.realnetworks.com/">Real Networks</a>.
This library provides support for the <a
href="http://www.w3.org/AudioVideo/">SMIL</a> playlist format and <a
href="http://www.xiph.org/ogg/vorbis/">Ogg Vorbis</a> and MP3 audio
formats.<br>
<h2>OSS</h2>
<a href="http://www.opensound.com/">Open Sound System</a>, a
cross-platform low level audio API for accessing analog audio devices.
This is the de-facto standard audio API for Linux until kernel 2.4.<br>
<h2>ALSA</h2>
<a href="http://www.alsa-project.org/">Advanced Linux Sound Architecture</a>,
a more advanced low level audio API. This is the de-facto standard
audio API for Linux since kernel 2.6.<br>
<h2>GTK+</h2>
<a href="http://www.gtk.org/">The GIMP Toolkit</a>, a cross-platform
graphical user interface API.<br>
<h1>Discussion<br>
</h1>
Among the software components listed above, OSS, ALSA and GTK+ are
industry standard, and are straightforward to use. But the Helix Client
Library is a special library, the open sourced version of Real
Network's streaming libraries.<br>
<br>
Tests were made to make sure Helix indeed compiles and runs fine on the
target platform. All libraries where successfully compiled and SMIL
playlists were successfully played. For this, the splay command line
sample program was used, which is part of the Helix codebase. For
compiling helix client libraries, refer to the <a
href="https://common.helixcommunity.org/2004/devdocs/quickstart">Getting
Started with the Helix Sources</a> pages. The settings used for
successful compilation:<br>
<br>
<code>[0] Set BIF branch (hxclient_1_3_0_neptunex)<br>
[1] Set Target(s) (splay)<br>
[2] Set Profile (helix-client-all-defines)<br>
[3] run: build<br>
[4] Toggle make depend &amp; makefiles (-e -n)<br>
[5] Toggle release (-trelease)<br>
[6] Toggle 'make clean'&nbsp; (-c)<br>
[7] Toggle clobber (Dangerous!) (-C)<br>
[8] Toggle halt-on-error (-p green)<br>
[9] Toggle verbose mode (-v)<br>
[10] Toggle static build (-tnodll)<br>
[11] Checkout source for selected target now<br>
[12] Set Tag/Branch/Timestamp<br>
[13] Help Page (full help in build/doc/index.html)<br>
[14] run history: build<br>
[Q] Quit</code><br>
<br>
</body>
</html>