94 lines
4.2 KiB
PHP
94 lines
4.2 KiB
PHP
<?php
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/////////////////////////////////////////////////////////////////
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/// getID3() by James Heinrich <info@getid3.org> //
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// available at http://getid3.sourceforge.net //
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// or http://www.getid3.org //
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/////////////////////////////////////////////////////////////////
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// See readme.txt for more details //
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/////////////////////////////////////////////////////////////////
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// //
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// module.audio.shorten.php //
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// module for analyzing Shorten Audio files //
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// dependencies: NONE //
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// ///
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/////////////////////////////////////////////////////////////////
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class getid3_rkau extends getid3_handler
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{
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function Analyze() {
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$info = &$this->getid3->info;
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fseek($this->getid3->fp, $info['avdataoffset'], SEEK_SET);
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$RKAUHeader = fread($this->getid3->fp, 20);
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$magic = 'RKA';
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if (substr($RKAUHeader, 0, 3) != $magic) {
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$info['error'][] = 'Expecting "'.getid3_lib::PrintHexBytes($magic).'" at offset '.$info['avdataoffset'].', found "'.getid3_lib::PrintHexBytes(substr($RKAUHeader, 0, 3)).'"';
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return false;
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}
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$info['fileformat'] = 'rkau';
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$info['audio']['dataformat'] = 'rkau';
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$info['audio']['bitrate_mode'] = 'vbr';
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$info['rkau']['raw']['version'] = getid3_lib::LittleEndian2Int(substr($RKAUHeader, 3, 1));
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$info['rkau']['version'] = '1.'.str_pad($info['rkau']['raw']['version'] & 0x0F, 2, '0', STR_PAD_LEFT);
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if (($info['rkau']['version'] > 1.07) || ($info['rkau']['version'] < 1.06)) {
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$info['error'][] = 'This version of getID3() ['.$this->getid3->version().'] can only parse RKAU files v1.06 and 1.07 (this file is v'.$info['rkau']['version'].')';
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unset($info['rkau']);
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return false;
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}
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$info['rkau']['source_bytes'] = getid3_lib::LittleEndian2Int(substr($RKAUHeader, 4, 4));
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$info['rkau']['sample_rate'] = getid3_lib::LittleEndian2Int(substr($RKAUHeader, 8, 4));
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$info['rkau']['channels'] = getid3_lib::LittleEndian2Int(substr($RKAUHeader, 12, 1));
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$info['rkau']['bits_per_sample'] = getid3_lib::LittleEndian2Int(substr($RKAUHeader, 13, 1));
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$info['rkau']['raw']['quality'] = getid3_lib::LittleEndian2Int(substr($RKAUHeader, 14, 1));
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$this->RKAUqualityLookup($info['rkau']);
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$info['rkau']['raw']['flags'] = getid3_lib::LittleEndian2Int(substr($RKAUHeader, 15, 1));
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$info['rkau']['flags']['joint_stereo'] = (bool) (!($info['rkau']['raw']['flags'] & 0x01));
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$info['rkau']['flags']['streaming'] = (bool) ($info['rkau']['raw']['flags'] & 0x02);
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$info['rkau']['flags']['vrq_lossy_mode'] = (bool) ($info['rkau']['raw']['flags'] & 0x04);
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if ($info['rkau']['flags']['streaming']) {
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$info['avdataoffset'] += 20;
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$info['rkau']['compressed_bytes'] = getid3_lib::LittleEndian2Int(substr($RKAUHeader, 16, 4));
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} else {
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$info['avdataoffset'] += 16;
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$info['rkau']['compressed_bytes'] = $info['avdataend'] - $info['avdataoffset'] - 1;
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}
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// Note: compressed_bytes does not always equal what appears to be the actual number of compressed bytes,
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// sometimes it's more, sometimes less. No idea why(?)
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$info['audio']['lossless'] = $info['rkau']['lossless'];
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$info['audio']['channels'] = $info['rkau']['channels'];
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$info['audio']['bits_per_sample'] = $info['rkau']['bits_per_sample'];
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$info['audio']['sample_rate'] = $info['rkau']['sample_rate'];
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$info['playtime_seconds'] = $info['rkau']['source_bytes'] / ($info['rkau']['sample_rate'] * $info['rkau']['channels'] * ($info['rkau']['bits_per_sample'] / 8));
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$info['audio']['bitrate'] = ($info['rkau']['compressed_bytes'] * 8) / $info['playtime_seconds'];
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return true;
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}
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function RKAUqualityLookup(&$RKAUdata) {
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$level = ($RKAUdata['raw']['quality'] & 0xF0) >> 4;
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$quality = $RKAUdata['raw']['quality'] & 0x0F;
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$RKAUdata['lossless'] = (($quality == 0) ? true : false);
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$RKAUdata['compression_level'] = $level + 1;
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if (!$RKAUdata['lossless']) {
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$RKAUdata['quality_setting'] = $quality;
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}
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return true;
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}
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}
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?>
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