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extension.cache.dbm.php	Edit
extension.cache.mysql.php	Edit
extension.cache.mysqli.php	Edit
extension.cache.sqlite3.php	Edit
getid3.lib.php	Edit
getid3.php	Edit
module.archive.gzip.php	Edit
module.archive.hpk.php	Edit
module.archive.rar.php	Edit
module.archive.szip.php	Edit
module.archive.tar.php	Edit
module.archive.xz.php	Edit
module.archive.zip.php	Edit
module.audio-video.asf.php	Edit
module.audio-video.bink.php	Edit
module.audio-video.flv.php	Edit
module.audio-video.ivf.php	Edit
module.audio-video.matroska.php	Edit
module.audio-video.mpeg.php	Edit
module.audio-video.nsv.php	Edit
module.audio-video.quicktime.php	Edit
module.audio-video.real.php	Edit
module.audio-video.riff.php	Edit
module.audio-video.swf.php	Edit
module.audio-video.ts.php	Edit
module.audio-video.wtv.php	Edit
module.audio.aa.php	Edit
module.audio.aac.php	Edit
module.audio.ac3.php	Edit
module.audio.amr.php	Edit
module.audio.au.php	Edit
module.audio.avr.php	Edit
module.audio.bonk.php	Edit
module.audio.dsdiff.php	Edit
module.audio.dsf.php	Edit
module.audio.dss.php	Edit
module.audio.dts.php	Edit
module.audio.flac.php	Edit
module.audio.la.php	Edit
module.audio.lpac.php	Edit
module.audio.midi.php	Edit
module.audio.mod.php	Edit
module.audio.monkey.php	Edit
module.audio.mp3.php	Edit
module.audio.mpc.php	Edit
module.audio.ogg.php	Edit
module.audio.optimfrog.php	Edit
module.audio.rkau.php	Edit
module.audio.shorten.php	Edit
module.audio.tak.php	Edit
module.audio.tta.php	Edit
module.audio.voc.php	Edit
module.audio.vqf.php	Edit
module.audio.wavpack.php	Edit
module.graphic.bmp.php	Edit
module.graphic.efax.php	Edit
module.graphic.gif.php	Edit
module.graphic.jpg.php	Edit
module.graphic.pcd.php	Edit
module.graphic.png.php	Edit
module.graphic.svg.php	Edit
module.graphic.tiff.php	Edit
module.misc.cue.php	Edit
module.misc.exe.php	Edit
module.misc.iso.php	Edit
module.misc.msoffice.php	Edit
module.misc.par2.php	Edit
module.misc.pdf.php	Edit
module.misc.torrent.php	Edit
module.tag.apetag.php	Edit
module.tag.id3v1.php	Edit
module.tag.id3v2.php	Edit
module.tag.lyrics3.php	Edit
module.tag.nikon-nctg.php	Edit
module.tag.xmp.php	Edit
write.apetag.php	Edit
write.id3v1.php	Edit
write.id3v2.php	Edit
write.lyrics3.php	Edit
write.metaflac.php	Edit
write.php	Edit
write.real.php	Edit
write.vorbiscomment.php	Edit

Editing: module.audio-video.nsv.php

<?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.nsv.php                                        //
// module for analyzing Nullsoft NSV files                     //
// dependencies: NONE                                          //
//                                                            ///
/////////////////////////////////////////////////////////////////

if (!defined('GETID3_INCLUDEPATH')) { // prevent path-exposing attacks that access modules directly on public webservers
	exit;
}

class getid3_nsv extends getid3_handler
{
	/**
	 * @return bool
	 */
	public function Analyze() {
		$info = &$this->getid3->info;

$this->fseek($info['avdataoffset']);
		$NSVheader = $this->fread(4);

switch ($NSVheader) {
			case 'NSVs':
				if ($this->getNSVsHeaderFilepointer(0)) {
					$info['fileformat']          = 'nsv';
					$info['audio']['dataformat'] = 'nsv';
					$info['video']['dataformat'] = 'nsv';
					$info['audio']['lossless']   = false;
					$info['video']['lossless']   = false;
				}
				break;

case 'NSVf':
				if ($this->getNSVfHeaderFilepointer(0)) {
					$info['fileformat']          = 'nsv';
					$info['audio']['dataformat'] = 'nsv';
					$info['video']['dataformat'] = 'nsv';
					$info['audio']['lossless']   = false;
					$info['video']['lossless']   = false;
					$this->getNSVsHeaderFilepointer($info['nsv']['NSVf']['header_length']);
				}
				break;

default:
				$this->error('Expecting "NSVs" or "NSVf" at offset '.$info['avdataoffset'].', found "'.getid3_lib::PrintHexBytes($NSVheader).'"');
				return false;
		}

if (!isset($info['nsv']['NSVf'])) {
			$this->warning('NSVf header not present - cannot calculate playtime or bitrate');
		}

return true;
	}

/**
	 * @param int $fileoffset
	 *
	 * @return bool
	 */
	public function getNSVsHeaderFilepointer($fileoffset) {
		$info = &$this->getid3->info;
		$this->fseek($fileoffset);
		$NSVsheader = $this->fread(28);
		$offset = 0;

$info['nsv']['NSVs']['identifier']      =                  substr($NSVsheader, $offset, 4);
		$offset += 4;

if ($info['nsv']['NSVs']['identifier'] != 'NSVs') {
			$this->error('expected "NSVs" at offset ('.$fileoffset.'), found "'.$info['nsv']['NSVs']['identifier'].'" instead');
			unset($info['nsv']['NSVs']);
			return false;
		}

$info['nsv']['NSVs']['offset']          = $fileoffset;

$info['nsv']['NSVs']['video_codec']     =                              substr($NSVsheader, $offset, 4);
		$offset += 4;
		$info['nsv']['NSVs']['audio_codec']     =                              substr($NSVsheader, $offset, 4);
		$offset += 4;
		$info['nsv']['NSVs']['resolution_x']    = getid3_lib::LittleEndian2Int(substr($NSVsheader, $offset, 2));
		$offset += 2;
		$info['nsv']['NSVs']['resolution_y']    = getid3_lib::LittleEndian2Int(substr($NSVsheader, $offset, 2));
		$offset += 2;

$info['nsv']['NSVs']['framerate_index'] = getid3_lib::LittleEndian2Int(substr($NSVsheader, $offset, 1));
		$offset += 1;
		//$info['nsv']['NSVs']['unknown1b']       = getid3_lib::LittleEndian2Int(substr($NSVsheader, $offset, 1));
		$offset += 1;
		//$info['nsv']['NSVs']['unknown1c']       = getid3_lib::LittleEndian2Int(substr($NSVsheader, $offset, 1));
		$offset += 1;
		//$info['nsv']['NSVs']['unknown1d']       = getid3_lib::LittleEndian2Int(substr($NSVsheader, $offset, 1));
		$offset += 1;
		//$info['nsv']['NSVs']['unknown2a']       = getid3_lib::LittleEndian2Int(substr($NSVsheader, $offset, 1));
		$offset += 1;
		//$info['nsv']['NSVs']['unknown2b']       = getid3_lib::LittleEndian2Int(substr($NSVsheader, $offset, 1));
		$offset += 1;
		//$info['nsv']['NSVs']['unknown2c']       = getid3_lib::LittleEndian2Int(substr($NSVsheader, $offset, 1));
		$offset += 1;
		//$info['nsv']['NSVs']['unknown2d']       = getid3_lib::LittleEndian2Int(substr($NSVsheader, $offset, 1));
		$offset += 1;

switch ($info['nsv']['NSVs']['audio_codec']) {
			case 'PCM ':
				$info['nsv']['NSVs']['bits_channel'] = getid3_lib::LittleEndian2Int(substr($NSVsheader, $offset, 1));
				$offset += 1;
				$info['nsv']['NSVs']['channels']     = getid3_lib::LittleEndian2Int(substr($NSVsheader, $offset, 1));
				$offset += 1;
				$info['nsv']['NSVs']['sample_rate']  = getid3_lib::LittleEndian2Int(substr($NSVsheader, $offset, 2));
				$offset += 2;

$info['audio']['sample_rate']        = $info['nsv']['NSVs']['sample_rate'];
				break;

case 'MP3 ':
			case 'NONE':
			default:
				//$info['nsv']['NSVs']['unknown3']     = getid3_lib::LittleEndian2Int(substr($NSVsheader, $offset, 4));
				$offset += 4;
				break;
		}

$info['video']['resolution_x']       = $info['nsv']['NSVs']['resolution_x'];
		$info['video']['resolution_y']       = $info['nsv']['NSVs']['resolution_y'];
		$info['nsv']['NSVs']['frame_rate']   = $this->NSVframerateLookup($info['nsv']['NSVs']['framerate_index']);
		$info['video']['frame_rate']         = $info['nsv']['NSVs']['frame_rate'];
		$info['video']['bits_per_sample']    = 24;
		$info['video']['pixel_aspect_ratio'] = (float) 1;

return true;
	}

/**
	 * @param int  $fileoffset
	 * @param bool $getTOCoffsets
	 *
	 * @return bool
	 */
	public function getNSVfHeaderFilepointer($fileoffset, $getTOCoffsets=false) {
		$info = &$this->getid3->info;
		$this->fseek($fileoffset);
		$NSVfheader = $this->fread(28);
		$offset = 0;

$info['nsv']['NSVf']['identifier']    =                  substr($NSVfheader, $offset, 4);
		$offset += 4;

if ($info['nsv']['NSVf']['identifier'] != 'NSVf') {
			$this->error('expected "NSVf" at offset ('.$fileoffset.'), found "'.$info['nsv']['NSVf']['identifier'].'" instead');
			unset($info['nsv']['NSVf']);
			return false;
		}

$info['nsv']['NSVs']['offset']        = $fileoffset;

$info['nsv']['NSVf']['header_length'] = getid3_lib::LittleEndian2Int(substr($NSVfheader, $offset, 4));
		$offset += 4;
		$info['nsv']['NSVf']['file_size']     = getid3_lib::LittleEndian2Int(substr($NSVfheader, $offset, 4));
		$offset += 4;

if ($info['nsv']['NSVf']['file_size'] > $info['avdataend']) {
			$this->warning('truncated file - NSVf header indicates '.$info['nsv']['NSVf']['file_size'].' bytes, file actually '.$info['avdataend'].' bytes');
		}

$info['nsv']['NSVf']['playtime_ms']   = getid3_lib::LittleEndian2Int(substr($NSVfheader, $offset, 4));
		$offset += 4;
		$info['nsv']['NSVf']['meta_size']     = getid3_lib::LittleEndian2Int(substr($NSVfheader, $offset, 4));
		$offset += 4;
		$info['nsv']['NSVf']['TOC_entries_1'] = getid3_lib::LittleEndian2Int(substr($NSVfheader, $offset, 4));
		$offset += 4;
		$info['nsv']['NSVf']['TOC_entries_2'] = getid3_lib::LittleEndian2Int(substr($NSVfheader, $offset, 4));
		$offset += 4;

if ($info['nsv']['NSVf']['playtime_ms'] == 0) {
			$this->error('Corrupt NSV file: NSVf.playtime_ms == zero');
			return false;
		}

$NSVfheader .= $this->fread($info['nsv']['NSVf']['meta_size'] + (4 * $info['nsv']['NSVf']['TOC_entries_1']) + (4 * $info['nsv']['NSVf']['TOC_entries_2']));
		$NSVfheaderlength = strlen($NSVfheader);
		$info['nsv']['NSVf']['metadata']      =                  substr($NSVfheader, $offset, $info['nsv']['NSVf']['meta_size']);
		$offset += $info['nsv']['NSVf']['meta_size'];

if ($getTOCoffsets) {
			$TOCcounter = 0;
			while ($TOCcounter < $info['nsv']['NSVf']['TOC_entries_1']) {
				if ($TOCcounter < $info['nsv']['NSVf']['TOC_entries_1']) {
					$info['nsv']['NSVf']['TOC_1'][$TOCcounter] = getid3_lib::LittleEndian2Int(substr($NSVfheader, $offset, 4));
					$offset += 4;
					$TOCcounter++;
				}
			}
		}

if (trim($info['nsv']['NSVf']['metadata']) != '') {
			$info['nsv']['NSVf']['metadata'] = str_replace('`', "\x01", $info['nsv']['NSVf']['metadata']);
			$CommentPairArray = explode("\x01".' ', $info['nsv']['NSVf']['metadata']);
			foreach ($CommentPairArray as $CommentPair) {
				if (strstr($CommentPair, '='."\x01")) {
					list($key, $value) = explode('='."\x01", $CommentPair, 2);
					$info['nsv']['comments'][strtolower($key)][] = trim(str_replace("\x01", '', $value));
				}
			}
		}

$info['playtime_seconds'] = $info['nsv']['NSVf']['playtime_ms'] / 1000;
		$info['bitrate']          = ($info['nsv']['NSVf']['file_size'] * 8) / $info['playtime_seconds'];

return true;
	}

/**
	 * @param int $framerateindex
	 *
	 * @return float|false
	 */
	public static function NSVframerateLookup($framerateindex) {
		if ($framerateindex <= 127) {
			return (float) $framerateindex;
		}
		static $NSVframerateLookup = array();
		if (empty($NSVframerateLookup)) {
			$NSVframerateLookup[129] = 29.970;
			$NSVframerateLookup[131] = 23.976;
			$NSVframerateLookup[133] = 14.985;
			$NSVframerateLookup[197] = 59.940;
			$NSVframerateLookup[199] = 47.952;
		}
		return (isset($NSVframerateLookup[$framerateindex]) ? $NSVframerateLookup[$framerateindex] : false);
	}

}