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oggvorbis	OpenAL

	Last updated: Thu, 26 Jun 2008

Examples

Examples on using the ogg:// wrapper.

Example #1 Reading an OGG/Vorbis file


<?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);



?>

Example #2 Encode an audio file to OGG/Vorbis


<?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);

?>

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oggvorbis	OpenAL

	Last updated: Thu, 26 Jun 2008

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