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<?php
// +----------------------------------------------------------------------+
// | PHP version 5 |
// +----------------------------------------------------------------------+
// | Copyright (c) 2002-2006 James Heinrich, Allan Hansen |
// +----------------------------------------------------------------------+
// | This source file is subject to version 2 of the GPL license, |
// | that is bundled with this package in the file license.txt and is |
// | available through the world-wide-web at the following url: |
// | http://www.gnu.org/copyleft/gpl.html |
// +----------------------------------------------------------------------+
// | getID3() - http://getid3.sourceforge.net or http://www.getid3.org |
// +----------------------------------------------------------------------+
// | Authors: James Heinrich <info�getid3*org> |
// | Allan Hansen <ah�artemis*dk> |
// +----------------------------------------------------------------------+
// | module.audio.rkau.php |
// | Module for analyzing RKAU Audio files |
// | dependencies: NONE |
// +----------------------------------------------------------------------+
//
// $Id: module.audio.rkau.php,v 1.2 2006/11/02 10:48:01 ah Exp $
class getid3_rkau extends getid3_handler
{
public function Analyze() {
$getid3 = $this->getid3;
fseek($getid3->fp, $getid3->info['avdataoffset'], SEEK_SET);
$rkau_header = fread($getid3->fp, 20);
// Magic bytes 'RKA'
$getid3->info['fileformat'] = 'rkau';
$getid3->info['audio']['dataformat'] = 'rkau';
$getid3->info['audio']['bitrate_mode'] = 'vbr';
// Shortcut
$getid3->info['rkau'] = array ();
$info_rkau = &$getid3->info['rkau'];
$info_rkau['raw']['version'] = getid3_lib::LittleEndian2Int(substr($rkau_header, 3, 1));
$info_rkau['version'] = '1.'.str_pad($info_rkau['raw']['version'] & 0x0F, 2, '0', STR_PAD_LEFT);
if (($info_rkau['version'] > 1.07) || ($info_rkau['version'] < 1.06)) {
throw new getid3_exception('This version of getID3() can only parse RKAU files v1.06 and 1.07 (this file is v'.$info_rkau['version'].')');
}
getid3_lib::ReadSequence('LittleEndian2Int', $info_rkau, $rkau_header, 4,
array (
'source_bytes' => 4,
'sample_rate' => 4,
'channels' => 1,
'bits_per_sample' => 1
)
);
$info_rkau['raw']['quality'] = getid3_lib::LittleEndian2Int(substr($rkau_header, 14, 1));
$quality = $info_rkau['raw']['quality'] & 0x0F;
$info_rkau['lossless'] = (($quality == 0) ? true : false);
$info_rkau['compression_level'] = (($info_rkau['raw']['quality'] & 0xF0) >> 4) + 1;
if (!$info_rkau['lossless']) {
$info_rkau['quality_setting'] = $quality;
}
$info_rkau['raw']['flags'] = getid3_lib::LittleEndian2Int(substr($rkau_header, 15, 1));
$info_rkau['flags']['joint_stereo'] = (bool)(!($info_rkau['raw']['flags'] & 0x01));
$info_rkau['flags']['streaming'] = (bool) ($info_rkau['raw']['flags'] & 0x02);
$info_rkau['flags']['vrq_lossy_mode'] = (bool) ($info_rkau['raw']['flags'] & 0x04);
if ($info_rkau['flags']['streaming']) {
$getid3->info['avdataoffset'] += 20;
$info_rkau['compressed_bytes'] = getid3_lib::LittleEndian2Int(substr($rkau_header, 16, 4));
}
else {
$getid3->info['avdataoffset'] += 16;
$info_rkau['compressed_bytes'] = $getid3->info['avdataend'] - $getid3->info['avdataoffset'] - 1;
}
// Note: compressed_bytes does not always equal what appears to be the actual number of compressed bytes,
// sometimes it's more, sometimes less. No idea why(?)
$getid3->info['audio']['lossless'] = $info_rkau['lossless'];
$getid3->info['audio']['channels'] = $info_rkau['channels'];
$getid3->info['audio']['bits_per_sample'] = $info_rkau['bits_per_sample'];
$getid3->info['audio']['sample_rate'] = $info_rkau['sample_rate'];
$getid3->info['playtime_seconds'] = $info_rkau['source_bytes'] / ($info_rkau['sample_rate'] * $info_rkau['channels'] * ($info_rkau['bits_per_sample'] / 8));
$getid3->info['audio']['bitrate'] = ($info_rkau['compressed_bytes'] * 8) / $getid3->info['playtime_seconds'];
return true;
}
}
?>
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