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+<div id="header">
+<h1>upmpdcli Linn Songcast integration</h1>
+</div>
+<div id="content">
+<div id="preamble">
+<div class="sectionbody">
+<div class="paragraph"><p>The <strong>sc2mpd</strong> auxiliary process implements part of Linn <strong>Songcast</strong> support
+for the <strong>upmdcli</strong> UPnP MPD front-end. Specifically, it implements a
+<strong>Songcast</strong> <em>Receiver</em> service, managed by <strong>upmpdcli</strong>.</p></div>
+<div class="paragraph"><p><strong><em>This has mostly been tested with 16 bits sound but a recent change seems
+to have fixed 24 bits sound, so this should be now usable for MACs.  This
+needs mpd 0.19 on the renderer. Still be a bit careful as this is quite new
+and there is a risk of strange noises !</em></strong></p></div>
+<div class="paragraph"><p><strong><em>Do not try 24 bits sound with MPD 0.18 !</em></strong> (or turn the volume very
+low&#8230;). Using Songcast from a Mac (24 bits audio) needs <strong>mpd 0.19</strong>,
+configured with <tt>--disable-audiofile</tt>.</p></div>
+<div class="paragraph"><p>As Debian and Ubuntu tend to lag quite bit on MPD progresses, I have setup
+<a href="downloads.html#mpd">backport repositories</a> for recent mpd versions
+(currently 0.19.9), for Ubuntu, Debian i386/amd64 and Raspbian.</p></div>
+</div>
+</div>
+<div class="sect1">
+<h2 id="_what_is_songcast">What is Songcast</h2>
+<div class="sectionbody">
+<div class="paragraph"><p>Songcast is a protocol for transporting audio streams across the
+network. This is independant from the UPnP framework which mostly deals
+with URLs and audio files (usually, but not necessarily, compressed).</p></div>
+<div class="paragraph"><p>The streams transported by Songcast are actual real-time audio data, which
+can go straight to an audio card for playing.</p></div>
+<div class="paragraph"><p>Controlling the streams on the renderer (connecting, starting, stopping) is
+done through an UPnP service named OpenHome <em>Receiver</em>.</p></div>
+<div class="paragraph"><p>The typical use of Songcast is to have an audio driver on a Windows or OS X
+desktop capture and forward the audio stream to a remote Songcast device.</p></div>
+<div class="paragraph"><p>Any application on the desktop will (be compelled to) transparently play to
+the remote device, without need to know anything about Songcast.</p></div>
+</div>
+</div>
+<div class="sect1">
+<h2 id="_implementation_of_songcast_support_in_upmpdcli">Implementation of Songcast support in upmpdcli</h2>
+<div class="sectionbody">
+<div class="paragraph"><p><strong>upmpdcli</strong> implements the <em>Receiver</em> service, and uses an auxiliary process
+(<strong>sc2mpd</strong>) for transporting the audio data. <strong>sc2mpd</strong> is a slight
+modification of the sample program which comes with the Linn Songcast
+open-source implementation, with the addition of an HTTP interface (based
+on <em>libmicrohttpd</em>) to forward the data to <strong>mpd</strong>.</p></div>
+<div class="paragraph"><p>Setting up a connection happens as follows:</p></div>
+<div class="ulist"><ul>
+<li>
+<p>
+If it finds an executable <strong>sc2mpd</strong> command in the PATH when starting up,
+  <strong>upmpdcli</strong> advertises a <em>Receiver</em> service.
+</p>
+</li>
+<li>
+<p>
+The Songcast implementation from the desktop finds out about the
+  <em>Receiver</em> through the normal UPnP mechanisms and can be instructed to
+  use it. It then tells the <em>Receiver</em> in <strong>upmpdcli</strong> to start playing.
+</p>
+</li>
+<li>
+<p>
+<strong>upmdpcli</strong> starts the <strong>sc2mpd</strong> process, which gets ready to receive data
+  through Songcast, and make it available through HTTP.
+</p>
+</li>
+<li>
+<p>
+<strong>upmpdcli</strong> instructs <strong>mpd</strong> to play the URL for the <strong>sc2mpd</strong> output.
+</p>
+</li>
+</ul></div>
+<div class="paragraph"><p>There is currently a 10-12 S delay between the connection request and the
+moment the audio starts playing. This is not normal, but I could not find
+the reason for it, so it&#8217;s an unavoidable inconvenience at the moment.</p></div>
+</div>
+</div>
+<div class="sect1">
+<h2 id="_configuration">Configuration</h2>
+<div class="sectionbody">
+<div class="paragraph"><p>No configuration is necessary by default: if <strong>sc2mpd</strong> is present,
+<strong>upmpdcli</strong> will advertise the Songcast capability, and any host with a
+Songcast sender installed should be able to use it.</p></div>
+<div class="paragraph"><p>However, you can set a number of values in the upmpdcli configuration file
+(you <strong>must</strong> set the <strong>upmpdcli</strong> <tt>-c</tt> option for <strong>sc2mpd</strong> to see them, the
+environment variable will not work):</p></div>
+<div class="dlist"><dl>
+<dt class="hdlist1">
+sclogfilename
+</dt>
+<dd>
+<p>
+Name of the file which will receive <strong>sc2mpd</strong> log messages. <tt>stderr</tt> by
+default. This <em>can&#8217;t be</em> the same file used by <strong>upmpdcli</strong>.
+</p>
+</dd>
+<dt class="hdlist1">
+scloglevel
+</dt>
+<dd>
+<p>
+Log verbosity.
+</p>
+</dd>
+<dt class="hdlist1">
+schttpport
+</dt>
+<dd>
+<p>
+HTTP port used by <strong>mpd</strong> to connect to <strong>sc2mpd</strong>. 8888 by default. This must
+be an available port on <tt>localhost</tt>, and it will only accept connections from
+<tt>localhost</tt>.
+</p>
+</dd>
+<dt class="hdlist1">
+sc2mpd
+</dt>
+<dd>
+<p>
+Path for the <strong>sc2mpd</strong> executable file (e.g. <tt>/usr/local/bin/sc2mpd</tt>). Only
+useful if <strong>sc2mpd</strong> was not installed to a location in the executable $PATH
+set for the init scripts. Typically only <tt>/bin</tt> and <tt>/usr/bin</tt> are in
+there.
+</p>
+</dd>
+</dl></div>
+</div>
+</div>
+<div class="sect1">
+<h2 id="_building_sc2mpd">Building sc2mpd</h2>
+<div class="sectionbody">
+<div class="paragraph"><p>There are two parts in building <strong>sc2mpd</strong>:</p></div>
+<div class="ulist"><ul>
+<li>
+<p>
+Building the Openhome libraries
+</p>
+</li>
+<li>
+<p>
+Building <strong>sc2mpd</strong> proper
+</p>
+</li>
+</ul></div>
+<div class="paragraph"><p>First clone the <strong>sc2mpd</strong> Github repository:
+<a href="http://www.github.com/medoc92/sc2mpd">http://www.github.com/medoc92/sc2mpd</a>.</p></div>
+<div class="paragraph"><p><strong>sc2mpd</strong> depends on the microhttpd library. Install the development and
+runtime packages which are currently named <em>libmicrohttpd-dev</em> and
+<em>libmicrohttpd10</em> on Debian-derived systems (use <em>libmicrohttpd</em> and
+<em>libmicrohttpd-devel</em> for Fedora).</p></div>
+<div class="paragraph"><p>Building the Openhome libraries is a bit of a black art, and the <strong>sc2mpd</strong>
+source comes with an <em>ohbuild.sh</em> script which will try to clone the
+Openhome Git repositories and build the libs:</p></div>
+<div class="literalblock">
+<div class="content">
+<pre><tt>cd sc2mpd
+mkdir /my/place/for/openhome
+sh ohbuild.sh /my/place/for/openhome</tt></pre>
+</div></div>
+<div class="paragraph"><p>Miscellaneous error messages will be displayed during the build. Hope for
+the best&#8230;</p></div>
+<div class="paragraph"><p>When this is done, build <strong>sc2mpd</strong>, using the following commands inside the
+<em>sc2mpd</em> directory:</p></div>
+<div class="literalblock">
+<div class="content">
+<pre><tt>sh autogen.sh
+./configure --prefix=/usr --with-openhome=/my/place/for/openhome
+make
+sudo make install</tt></pre>
+</div></div>
+<div class="paragraph"><p>The build uses static Openhome libraries, so you can move the executable to
+another machine without needing the Openhome directory (don&#8217;t forget to
+install the <em>libmicrohttpd</em> runtime though).</p></div>
+<div class="paragraph"><p>After restarting <strong>upmpdcli</strong>, it should advertise the <em>Receiver</em> service and
+appear in the Songcast Sender menus.</p></div>
+</div>
+</div>
+<div class="sect1">
+<h2 id="_miscellaneous_remarks">Miscellaneous remarks</h2>
+<div class="sectionbody">
+<div class="paragraph"><p>Songcast is probably best transported over a wired connection. If you are
+doing this over WIFI and experiencing glitches, the wireless is the first
+suspect.</p></div>
+</div>
+</div>
+</div>
+<div id="footnotes"><hr /></div>
+<div id="footer">
+<div id="footer-text">
+Last updated 2015-04-07 11:24:19 CEST
+</div>
+</div>
+</body>
+</html>