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1 files changed, 114 insertions, 0 deletions

diff --git a/includes/getid3/module.audio.dss.php b/includes/getid3/module.audio.dss.php
new file mode 100644
index 0000000..dd2a56b
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+++ b/includes/getid3/module.audio.dss.php
@@ -0,0 +1,114 @@
+<?php
+
+/////////////////////////////////////////////////////////////////
+/// getID3() by James Heinrich <info@getid3.org>               //
+//  available at https://github.com/JamesHeinrich/getID3       //
+//            or https://www.getid3.org                        //
+//            or http://getid3.sourceforge.net                 //
+//  see readme.txt for more details                            //
+/////////////////////////////////////////////////////////////////
+//                                                             //
+// module.audio.dss.php                                        //
+// module for analyzing Digital Speech Standard (DSS) files    //
+// dependencies: NONE                                          //
+//                                                            ///
+/////////////////////////////////////////////////////////////////
+
+if (!defined('GETID3_INCLUDEPATH')) { // prevent path-exposing attacks that access modules directly on public webservers
+	exit;
+}
+
+class getid3_dss extends getid3_handler
+{
+	/**
+	 * @return bool
+	 */
+	public function Analyze() {
+		$info = &$this->getid3->info;
+
+		$this->fseek($info['avdataoffset']);
+		$DSSheader  = $this->fread(1540);
+
+		if (!preg_match('#^[\\x02-\\x08]ds[s2]#', $DSSheader)) {
+			$this->error('Expecting "[02-08] 64 73 [73|32]" at offset '.$info['avdataoffset'].', found "'.getid3_lib::PrintHexBytes(substr($DSSheader, 0, 4)).'"');
+			return false;
+		}
+
+		// some structure information taken from http://cpansearch.perl.org/src/RGIBSON/Audio-DSS-0.02/lib/Audio/DSS.pm
+		$info['encoding']              = 'ISO-8859-1'; // not certain, but assumed
+		$info['dss'] = array();
+
+		$info['fileformat']            = 'dss';
+		$info['mime_type']             = 'audio/x-'.substr($DSSheader, 1, 3); // "audio/x-dss" or "audio/x-ds2"
+		$info['audio']['dataformat']   =            substr($DSSheader, 1, 3); //         "dss" or         "ds2"
+		$info['audio']['bitrate_mode'] = 'cbr';
+
+		$info['dss']['version']            =                            ord(substr($DSSheader,    0,   1));
+		$info['dss']['hardware']           =                           trim(substr($DSSheader,   12,  16)); // identification string for hardware used to create the file, e.g. "DPM 9600", "DS2400"
+		$info['dss']['unknown1']           =   getid3_lib::LittleEndian2Int(substr($DSSheader,   28,   4));
+		// 32-37 = "FE FF FE FF F7 FF" in all the sample files I've seen
+		$info['dss']['date_create_unix']   = $this->DSSdateStringToUnixDate(substr($DSSheader,   38,  12));
+		$info['dss']['date_complete_unix'] = $this->DSSdateStringToUnixDate(substr($DSSheader,   50,  12));
+		$info['dss']['playtime_sec']       = ((int) substr($DSSheader, 62, 2) * 3600) + ((int) substr($DSSheader, 64, 2) * 60) + (int) substr($DSSheader, 66, 2); // approximate file playtime in HHMMSS
+		if ($info['dss']['version'] <= 3) {
+			$info['dss']['playtime_ms']        =   getid3_lib::LittleEndian2Int(substr($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
+			$info['dss']['priority']           =                            ord(substr($DSSheader,  793,   1));
+			$info['dss']['comments']           =                           trim(substr($DSSheader,  798, 100));
+			$info['dss']['sample_rate_index']  =                            ord(substr($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
+			$info['audio']['sample_rate']      = $this->DSSsampleRateLookup($info['dss']['sample_rate_index']);
+		} else {
+			$this->getid3->warning('DSS above version 3 not fully supported in this version of getID3. Any additional documentation or format specifications would be welcome. This file is version '.$info['dss']['version']);
+		}
+
+		$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
+		$info['audio']['channels']         = 1;
+
+		if (!empty($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
+			$info['playtime_seconds'] = $info['dss']['playtime_ms'] / 1000;
+		} else {
+			$info['playtime_seconds'] = $info['dss']['playtime_sec'];
+			if (!empty($info['dss']['playtime_ms'])) {
+				$this->getid3->warning('playtime_ms ('.number_format($info['dss']['playtime_ms'] / 1000, 3).') does not match playtime_sec ('.number_format($info['dss']['playtime_sec']).') - using playtime_sec value');
+			}
+		}
+		$info['audio']['bitrate'] = ($info['filesize'] * 8) / $info['playtime_seconds'];
+
+		return true;
+	}
+
+	/**
+	 * @param string $datestring
+	 *
+	 * @return int|false
+	 */
+	public function DSSdateStringToUnixDate($datestring) {
+		$y = (int) substr($datestring,  0, 2);
+		$m = substr($datestring,  2, 2);
+		$d = substr($datestring,  4, 2);
+		$h = substr($datestring,  6, 2);
+		$i = substr($datestring,  8, 2);
+		$s = substr($datestring, 10, 2);
+		$y += (($y < 95) ? 2000 : 1900);
+		return mktime($h, $i, $s, $m, $d, $y);
+	}
+
+	/**
+	 * @param int $sample_rate_index
+	 *
+	 * @return int|false
+	 */
+	public function DSSsampleRateLookup($sample_rate_index) {
+		static $dssSampleRateLookup = array(
+			0x0A => 16000,
+			0x0C => 11025,
+			0x0D => 12000,
+			0x15 =>  8000,
+		);
+		if (!array_key_exists($sample_rate_index, $dssSampleRateLookup)) {
+			$this->getid3->warning('unknown sample_rate_index: 0x'.strtoupper(dechex($sample_rate_index)));
+			return false;
+		}
+		return $dssSampleRateLookup[$sample_rate_index];
+	}
+
+}