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<?xml version="1.0" encoding="iso-8859-1"?>
<!-- $Revision: 1.3 $ -->
<chapter xml:id="oggvorbis.contexts" xmlns="http://docbook.org/ns/docbook">
<title>Context options</title>
<table>
<title>OGG/Vorbis tuning options</title>
<tgroup cols="4">
<thead>
<row>
<entry>Option</entry>
<entry>Definition</entry>
<entry>Relevance</entry>
<entry>Default</entry>
</row>
</thead>
<tbody>
<row>
<entry>pcm_mode</entry>
<entry>PCM byte encoding used. See constants below.</entry>
<entry>Read / Write</entry>
<entry><constant>OGGVORBIS_PCM_S16_LE</constant></entry>
</row>
<row>
<entry>rate</entry>
<entry>PCM Sampling rate. Measured in Hz.</entry>
<entry>Write only</entry>
<entry><constant>44100</constant></entry>
</row>
<row>
<entry>bitrate</entry>
<entry>
Vorbis Average Bitrate Encoding / Variable Bitrate Encoding.
Measured in bps (ABR) or Quality level (VBR: 0.0 to 1.0).
128000 ABR is rough equal to 0.4 VBR.
</entry>
<entry>Write only</entry>
<entry><constant>128000</constant></entry>
</row>
<row>
<entry>channels</entry>
<entry>Number of PCM channels. 1 == Mono, 2 == Stereo.</entry>
<entry>Write only</entry>
<entry><constant>2</constant></entry>
</row>
<row>
<entry>serialno</entry>
<entry>
Serial Number of stream within file. Must be unique within file.
Because of the potential to select a duplicate serial number within
a chained file, make efforts to manually assign unique numbers when
encoding.
</entry>
<entry>Write only</entry>
<entry><emphasis>Random</emphasis></entry>
</row>
<row>
<entry>comments</entry>
<entry>
Associative array of file comments.
Will be translated to <literal>strtoupper($name) . "=$value"</literal>.
Note: This context option is not available in oggvorbis-0.1
</entry>
<entry>Write only</entry>
<entry><constant>array('ENCODER' => 'PHP/OggVorbis, http://pear.php.net/oggvorbis')</constant></entry>
</row>
</tbody>
</tgroup>
</table>
</chapter>
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