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<?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);
}
}