100 lines
5.4 KiB
PHP
100 lines
5.4 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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// also https://github.com/JamesHeinrich/getID3 //
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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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$this->fseek($info['avdataoffset']);
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$DSSheader = $this->fread(1540);
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if (!preg_match('#^[\\x02-\\x06]ds[s2]#', $DSSheader)) {
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$this->error('Expecting "[02-06] 64 73 [73|32]" 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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$info['encoding'] = 'ISO-8859-1'; // not certain, but assumed
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$info['dss'] = array();
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$info['fileformat'] = 'dss';
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$info['mime_type'] = 'audio/x-'.substr($DSSheader, 1, 3); // "audio/x-dss" or "audio/x-ds2"
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$info['audio']['dataformat'] = substr($DSSheader, 1, 3); // "dss" or "ds2"
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$info['audio']['bitrate_mode'] = 'cbr';
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$info['dss']['version'] = ord(substr($DSSheader, 0, 1));
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$info['dss']['hardware'] = trim(substr($DSSheader, 12, 16)); // identification string for hardware used to create the file, e.g. "DPM 9600", "DS2400"
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$info['dss']['unknown1'] = getid3_lib::LittleEndian2Int(substr($DSSheader, 28, 4));
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// 32-37 = "FE FF FE FF F7 FF" in all the sample files I've seen
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$info['dss']['date_create_unix'] = $this->DSSdateStringToUnixDate(substr($DSSheader, 38, 12));
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$info['dss']['date_complete_unix'] = $this->DSSdateStringToUnixDate(substr($DSSheader, 50, 12));
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$info['dss']['playtime_sec'] = intval((substr($DSSheader, 62, 2) * 3600) + (substr($DSSheader, 64, 2) * 60) + substr($DSSheader, 66, 2)); // approximate file playtime in HHMMSS
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if ($info['dss']['version'] <= 3) {
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$info['dss']['playtime_ms'] = getid3_lib::LittleEndian2Int(substr($DSSheader, 512, 4)); // exact file playtime in milliseconds. Has also been observed at offset 530 in one sample file, with something else (unknown) at offset 512
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$info['dss']['priority'] = ord(substr($DSSheader, 793, 1));
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$info['dss']['comments'] = trim(substr($DSSheader, 798, 100));
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$info['dss']['sample_rate_index'] = ord(substr($DSSheader, 1538, 1)); // this isn't certain, this may or may not be where the sample rate info is stored, but it seems consistent on my small selection of sample files
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$info['audio']['sample_rate'] = $this->DSSsampleRateLookup($info['dss']['sample_rate_index']);
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} else {
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$this->getid3->warning('DSS above version 3 not fully supported in this version of getID3. Any additional documentation or format specifications would be welcome. This file is version '.$info['dss']['version']);
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}
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$info['audio']['bits_per_sample'] = 16; // maybe, maybe not -- most compressed audio formats don't have a fixed bits-per-sample value, but this is a reasonable approximation
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$info['audio']['channels'] = 1;
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if (!empty($info['dss']['playtime_ms']) && (floor($info['dss']['playtime_ms'] / 1000) == $info['dss']['playtime_sec'])) { // *should* just be playtime_ms / 1000 but at least one sample file has playtime_ms at offset 530 instead of offset 512, so safety check
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$info['playtime_seconds'] = $info['dss']['playtime_ms'] / 1000;
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} else {
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$info['playtime_seconds'] = $info['dss']['playtime_sec'];
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if (!empty($info['dss']['playtime_ms'])) {
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$this->getid3->warning('playtime_ms ('.number_format($info['dss']['playtime_ms'] / 1000, 3).') does not match playtime_sec ('.number_format($info['dss']['playtime_sec']).') - using playtime_sec value');
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}
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}
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$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, $y);
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}
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public function DSSsampleRateLookup($sample_rate_index) {
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static $dssSampleRateLookup = array(
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0x0A => 16000,
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0x0C => 11025,
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0x0D => 12000,
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0x15 => 8000,
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);
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if (!array_key_exists($sample_rate_index, $dssSampleRateLookup)) {
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$this->getid3->warning('unknown sample_rate_index: 0x'.strtoupper(dechex($sample_rate_index)));
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return false;
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}
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return $dssSampleRateLookup[$sample_rate_index];
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}
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}
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