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<page	xmlns="http://projectmallard.org/1.0/"
	type="guide"
	id="glossary">

<info>
	<link type="topic" xref="index#extra"/>
	<desc>Technical and streamtuner2 specific terminology and jargon.</desc>
</info>

	<title>Glossary</title>



	<terms>

	  <item>
	    <title>Channel</title>
	    <p>Each tab in the main window is a "channel". It represents one
   	    music directory service.</p>
	  </item>

	  <item>
	    <title>Stream</title>
	    <p>"stream" is a technical term which means continuosly flowing
	    data.  MP3 radio music for example is streamed, because it's not
	    just a time-limited audio file, but unending (unless you stop
	    the player or paying your ISP).</p>
	    <p>In streamtuner2 the terms "stream" and radio "station" are used interchangably.</p>
	  </item>

	  <item>
	    <title>Genre</title>
	    <p>Music genres are represented as "categories" in the left
	    pane.  Every channel groups its music stations into some
	    structure.</p>
	  </item>

	  <item>
	    <title>URL</title> <p>URL stands for "Uniform Resource Locator"
	    and simply refers to something retrievable hyperlinks or web addresses like
	    http://www.example.org/.  Radio stations/streams are stored as URLs internally.
            The more generic hipster term "URI" (long superseded by "IRI" anyway)
            makes less sense in this context, because ISBN: or MailTo: references aren't
            overly useful for such purposes.</p>
	  </item>

	  <item>
	    <title>Radio</title>
	    <p>Plays music. Sometimes interrupted by advertisements.
   	    </p>
	  </item>

	  <item>
	    <title>Favicons</title> <p>Favicons are small symbols for
	    websites.  Most website should have one.  (ST2 downloads
	    favicons either per menu command or automatically for the
	    current station once you hit play.) </p>
	  </item>

	  <item>
	    <title>Cache</title>
	    <p>Radio lists are kept in "cache" files for efficiency reasons.
	    To not redownload stream information on every category or channel
	    flip, streamtuner2 saves this data. This avoids time consuming
	    server requests.
   	    </p>
	  </item>

	  <item>
	    <title>Python</title>
	    <p>Python is a programming language. It provides extensive constructs and
	    many functions, yet is easy to learn. See python.org and Google.</p>
	  </item>

	  <item>
	    <title>MP3</title>
	    <p>MP3 (MPEG Layer 3) is an audio file format, part of the wider MPEG (Motion Picture
	    Expert Group) video format. It's the most widespread format in use today,
	    however doesn't provide the highest audio quality..</p>
	  </item>

	  <item>
	    <title>OGG Vorbis</title>
	    <p>OGG is a multimedia file format. Vorbis is an audio compression format.
	    OGG Vorbis was developed as alternative to MP3. It's often of higher
	    quality at lower file sizes, and isn't encumbered by US software patents.</p>
	  </item>

	  <item>
	    <title>MIME</title>
	    <p>For classification of web and email content, two-factor descriptions like
	    "audio/ogg" are advised. These are called Multipurpose Internet Mail Extension
            types, and are used on the web in lieu of file extensions (which URL resources don't have).
            Note that ST2 uses the MP3 type wrong; it's officially
            audio/mpeg, and not audio/mp3 as shown in the settings window.</p>
	  </item>

	  <item>
	    <title>Bitrate</title>
	    <p>Audio streams are compressed with exactness loss. This can be heard
	    at lower "bitrates". For MP3 files any music with less than 100 kbit/s
	    starts to hiss, while OGG Vorbis still sounds okay at a datarate of
	    e.g. 64 kbit per second. So while bitrate basically means file size per duration,
	    it's commonly used as quality indicator.</p>
	  </item>

	</terms>

	<section id="filetypes">
            <title>Filetypes</title>

            <p>Besides audio formats MP3 and OGG, there are also station/streaming link files.
            These are often downloaded from the directory servers, before your music player gets activated.</p>
	</section>

</page>