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<?xml version="1.0" encoding="utf-8"?>
<!-- $Revision: 297028 $ -->
<chapter xml:id="oggvorbis.examples" xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink">
&reftitle.examples;
<section xml:id="oggvorbis.examples-basisc">
<title>Examples on using the ogg:// wrapper.</title>
<para>
<example>
<title>Reading an OGG/Vorbis file</title>
<programlisting role="php">
<![CDATA[
<?php
dl("oggvorbis.so");
/* By default, ogg:// will decode to Signed 16-bit Little Endian */
$fp = fopen('ogg://myaudio.ogg', 'r');
/* Collect some information about the file. */
$metadata = stream_get_meta_data($fp);
/* Inspect the first song (usually the only song,
but OGG/Vorbis files may be chained) */
$songdata = $metadata['wrapper_data'][0];
echo "OGG/Vorbis file encoded by: {$songdata['vendor']}\n.";
echo " {$songdata['channels']} channels of {$songdata['rate']}Hz sampling encoded at {$songdata['bitrate_nominal']}bps.\n";
foreach($songdata['comments'] as $comment) {
echo " $comment\n";
}
while ($audio_data = fread($fp, 8192)) {
/* Do something with the PCM audio we're extracting from the OGG.
Copying to /dev/dsp is a good target on linux systems,
just remember to setup the device for your sampling mode first. */
}
fclose($fp);
?>
]]>
</programlisting>
</example>
</para>
<para>
<example>
<title>Encode an audio file to OGG/Vorbis</title>
<programlisting role="php">
<![CDATA[
<?php
dl('oggvorbis.so');
$context = stream_context_create(array('ogg'=>array(
'pcm_mode' => OGGVORBIS_PCM_S8, /* Signed 8bit audio */
'rate' => 44100, /* 44kHz CD quality */
'bitrate' => 0.5, /* Midquality VBR */
'channels' => 1, /* Mono */
'serialno' => 12345))); /* Unique within our stream */
/* Open file for appending. This will "chain" a second OGG stream at the end of the first. */
$ogg = fopen('ogg://mysong.ogg', 'a', false, $context);
$pcm = fopen('mysample.pcm', 'r');
/* Compress the raw PCM audio from mysample.pcm into mysong.ogg */
stream_copy_to_stream($pcm, $ogg);
fclose($pcm);
fclose($ogg);
?>
]]>
</programlisting>
</example>
</para>
</section>
</chapter>
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