73 lines
3.0 KiB
PHP
73 lines
3.0 KiB
PHP
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<?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.dss.php //
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// module for analyzing Digital Speech Standard (DSS) files //
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// dependencies: NONE //
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// ///
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/////////////////////////////////////////////////////////////////
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class getid3_dss extends getid3_handler
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{
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public function Analyze() {
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$info = &$this->getid3->info;
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fseek($this->getid3->fp, $info['avdataoffset'], SEEK_SET);
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$DSSheader = fread($this->getid3->fp, 1256);
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if (!preg_match('#^(\x02|\x03)dss#', $DSSheader)) {
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$info['error'][] = 'Expecting "[02-03] 64 73 73" at offset '.$info['avdataoffset'].', found "'.getid3_lib::PrintHexBytes(substr($DSSheader, 0, 4)).'"';
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return false;
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}
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// some structure information taken from http://cpansearch.perl.org/src/RGIBSON/Audio-DSS-0.02/lib/Audio/DSS.pm
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// shortcut
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$info['dss'] = array();
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$thisfile_dss = &$info['dss'];
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$info['fileformat'] = 'dss';
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$info['audio']['dataformat'] = 'dss';
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$info['audio']['bitrate_mode'] = 'cbr';
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//$thisfile_dss['encoding'] = 'ISO-8859-1';
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$thisfile_dss['version'] = ord(substr($DSSheader, 0, 1));
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$thisfile_dss['date_create'] = $this->DSSdateStringToUnixDate(substr($DSSheader, 38, 12));
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$thisfile_dss['date_complete'] = $this->DSSdateStringToUnixDate(substr($DSSheader, 50, 12));
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//$thisfile_dss['length'] = intval(substr($DSSheader, 62, 6)); // I thought time was in seconds, it's actually HHMMSS
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$thisfile_dss['length'] = intval((substr($DSSheader, 62, 2) * 3600) + (substr($DSSheader, 64, 2) * 60) + substr($DSSheader, 66, 2));
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$thisfile_dss['priority'] = ord(substr($DSSheader, 793, 1));
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$thisfile_dss['comments'] = trim(substr($DSSheader, 798, 100));
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//$info['audio']['bits_per_sample'] = ?;
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//$info['audio']['sample_rate'] = ?;
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$info['audio']['channels'] = 1;
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$info['playtime_seconds'] = $thisfile_dss['length'];
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$info['audio']['bitrate'] = ($info['filesize'] * 8) / $info['playtime_seconds'];
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return true;
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}
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public function DSSdateStringToUnixDate($datestring) {
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$y = substr($datestring, 0, 2);
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$m = substr($datestring, 2, 2);
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$d = substr($datestring, 4, 2);
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$h = substr($datestring, 6, 2);
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$i = substr($datestring, 8, 2);
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$s = substr($datestring, 10, 2);
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$y += (($y < 95) ? 2000 : 1900);
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return mktime($h, $i, $s, $m, $d, $y);
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}
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}
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