217 lines
9.2 KiB
PHP
217 lines
9.2 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 https://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.tak.php //
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// module for analyzing Tom's lossless Audio Kompressor //
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// dependencies: NONE //
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// ///
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/////////////////////////////////////////////////////////////////
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if (!defined('GETID3_INCLUDEPATH')) { // prevent path-exposing attacks that access modules directly on public webservers
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exit;
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}
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class getid3_tak extends getid3_handler
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{
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/**
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* @return bool
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*/
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public function Analyze() {
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$info = &$this->getid3->info;
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$info['fileformat'] = 'tak';
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$info['audio']['dataformat'] = 'tak';
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$info['audio']['bitrate_mode'] = 'vbr';
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$info['audio']['lossless'] = true;
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$info['tak_audio']['raw'] = array();
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$thisfile_takaudio = &$info['tak_audio'];
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$thisfile_takaudio_raw = &$thisfile_takaudio['raw'];
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$this->fseek($info['avdataoffset']);
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$TAKMetaData = $this->fread(4);
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$thisfile_takaudio_raw['magic'] = $TAKMetaData;
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$magic = 'tBaK';
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if ($thisfile_takaudio_raw['magic'] != $magic) {
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$this->error('Expecting "'.getid3_lib::PrintHexBytes($magic).'" at offset '.$info['avdataoffset'].', found "'.getid3_lib::PrintHexBytes($thisfile_takaudio_raw['magic']).'"');
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unset($info['fileformat']);
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return false;
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}
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$offset = 4; //skip magic
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$this->fseek($offset);
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$TAKMetaData = $this->fread(4); //read Metadata Block Header
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$objtype = getid3_lib::BigEndian2Int(substr($TAKMetaData, 0, 1)); //Metadata Block Object Type
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$objlength = getid3_lib::LittleEndian2Int(substr($TAKMetaData, 1, 3)); //Metadata Block Object Lenght excluding header
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if ($objtype == 1) { //The First Metadata Block Object must be of Type 1 (STREAMINFO)
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$offset += 4; //skip to Metadata Block contents
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$this->fseek($offset);
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$TAKMetaData = $this->fread($objlength); // Get the raw Metadata Block Data
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$thisfile_takaudio_raw['STREAMINFO'] = getid3_lib::LittleEndian2Bin(substr($TAKMetaData, 0, $objlength - 3));
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$offset += $objlength; // Move to the next Metadata Block Object
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$thisfile_takaudio['channels'] = getid3_lib::Bin2Dec(substr($thisfile_takaudio_raw['STREAMINFO'], 1, 4)) + 1;
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$thisfile_takaudio['bits_per_sample'] = getid3_lib::Bin2Dec(substr($thisfile_takaudio_raw['STREAMINFO'], 5, 5)) + 8;
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$thisfile_takaudio['sample_rate'] = getid3_lib::Bin2Dec(substr($thisfile_takaudio_raw['STREAMINFO'], 10, 18)) + 6000;
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$thisfile_takaudio['samples'] = getid3_lib::Bin2Dec(substr($thisfile_takaudio_raw['STREAMINFO'], 31, 35));
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$thisfile_takaudio['framesize'] = self::TAKFramesizeLookup(getid3_lib::Bin2Dec(substr($thisfile_takaudio_raw['STREAMINFO'], 66, 4)));
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$thisfile_takaudio['codectype'] = self::TAKCodecTypeLookup(getid3_lib::Bin2Dec(substr($thisfile_takaudio_raw['STREAMINFO'], 74, 6)));
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} else {
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$this->error('Expecting Type 1 (STREAMINFO) Metadata Object header, but found Type "'.$objtype.'" Object instead');
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unset($info['fileformat']);
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return false;
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}
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$this->fseek($offset);
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$TAKMetaData = $this->fread(4);
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$objtype = getid3_lib::BigEndian2Int(substr($TAKMetaData, 0, 1));
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$objlength = getid3_lib::LittleEndian2Int(substr($TAKMetaData, 1, 3));
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while ($objtype != 0) {
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switch ($objtype) {
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case 4 :
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// ENCODERINFO Metadata Block
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$offset += 4;
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$this->fseek($offset);
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$TAKMetaData = $this->fread($objlength);
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$ver = getid3_lib::LittleEndian2Int(substr($TAKMetaData, 0, 3));
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$major = ($ver & 0xff0000) >> 16;
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$minor = ($ver & 0x00ff00) >> 8;
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$revision= $ver & 0x0000ff;
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$thisfile_takaudio['version'] = 'TAK V '.$major.'.'.$minor.'.'.$revision;
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$thisfile_takaudio['profile'] = self::TAKProfileLookup(getid3_lib::BigEndian2Int(substr($TAKMetaData, 3, 1)));
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$offset += $objlength;
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break;
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case 6 :
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// MD5 Checksum Metadata Block
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$offset += 4;
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$this->fseek($offset);
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$TAKMetaData = $this->fread($objlength);
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$thisfile_takaudio_raw['MD5Data'] = substr($TAKMetaData, 0, 16);
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$offset += $objlength;
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break;
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case 7 :
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// LASTFRAME Metadata Block
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$offset += 4;
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$this->fseek($offset);
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$TAKMetaData = $this->fread($objlength);
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$thisfile_takaudio['lastframe_pos'] = getid3_lib::LittleEndian2Int(substr($TAKMetaData, 0, 5));
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$thisfile_takaudio['last_frame_size'] = getid3_lib::LittleEndian2Int(substr($TAKMetaData, 5, 3));
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$offset += $objlength;
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break;
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case 3 :
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// ORIGINALFILEDATA Metadata Block
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$offset += 4;
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$this->fseek($offset);
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$TAKMetaData = $this->fread($objlength);
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$headersize = getid3_lib::LittleEndian2Int(substr($TAKMetaData, 0, 3));
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$footersize = getid3_lib::LittleEndian2Int(substr($TAKMetaData, 3, 3));
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if ($headersize) $thisfile_takaudio_raw['header_data'] = substr($TAKMetaData, 6, $headersize);
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if ($footersize) $thisfile_takaudio_raw['footer_data'] = substr($TAKMetaData, $headersize, $footersize);
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$offset += $objlength;
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break;
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default :
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// PADDING or SEEKTABLE Metadata Block. Just skip it
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$offset += 4;
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$this->fseek($offset);
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$TAKMetaData = $this->fread($objlength);
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$offset += $objlength;
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break;
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}
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$this->fseek($offset);
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$TAKMetaData = $this->fread(4);
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$objtype = getid3_lib::BigEndian2Int(substr($TAKMetaData, 0, 1));
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$objlength = getid3_lib::LittleEndian2Int(substr($TAKMetaData, 1, 3));
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}
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// Finished all Metadata Blocks. So update $info['avdataoffset'] because next block is the first Audio data block
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$info['avdataoffset'] = $offset;
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$info['audio']['channels'] = $thisfile_takaudio['channels'];
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if ($thisfile_takaudio['sample_rate'] == 0) {
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$this->error('Corrupt TAK file: samplerate == zero');
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return false;
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}
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$info['audio']['sample_rate'] = $thisfile_takaudio['sample_rate'];
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$thisfile_takaudio['playtime'] = $thisfile_takaudio['samples'] / $thisfile_takaudio['sample_rate'];
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if ($thisfile_takaudio['playtime'] == 0) {
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$this->error('Corrupt TAK file: playtime == zero');
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return false;
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}
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$info['playtime_seconds'] = $thisfile_takaudio['playtime'];
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$thisfile_takaudio['compressed_size'] = $info['avdataend'] - $info['avdataoffset'];
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$thisfile_takaudio['uncompressed_size'] = $thisfile_takaudio['samples'] * $thisfile_takaudio['channels'] * ($thisfile_takaudio['bits_per_sample'] / 8);
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if ($thisfile_takaudio['uncompressed_size'] == 0) {
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$this->error('Corrupt TAK file: uncompressed_size == zero');
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return false;
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}
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$thisfile_takaudio['compression_ratio'] = $thisfile_takaudio['compressed_size'] / ($thisfile_takaudio['uncompressed_size'] + $offset);
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$thisfile_takaudio['bitrate'] = (($thisfile_takaudio['samples'] * $thisfile_takaudio['channels'] * $thisfile_takaudio['bits_per_sample']) / $thisfile_takaudio['playtime']) * $thisfile_takaudio['compression_ratio'];
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$info['audio']['bitrate'] = $thisfile_takaudio['bitrate'];
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if (empty($thisfile_takaudio_raw['MD5Data'])) {
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//$this->warning('MD5Data is not set');
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} elseif ($thisfile_takaudio_raw['MD5Data'] === str_repeat("\x00", 16)) {
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//$this->warning('MD5Data is null');
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} else {
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$info['md5_data_source'] = '';
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$md5 = $thisfile_takaudio_raw['MD5Data'];
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for ($i = 0; $i < strlen($md5); $i++) {
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$info['md5_data_source'] .= str_pad(dechex(ord($md5[$i])), 2, '00', STR_PAD_LEFT);
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}
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if (!preg_match('/^[0-9a-f]{32}$/', $info['md5_data_source'])) {
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unset($info['md5_data_source']);
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}
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}
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foreach (array('bits_per_sample', 'version', 'profile') as $key) {
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if (!empty($thisfile_takaudio[$key])) {
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$info['audio'][$key] = $thisfile_takaudio[$key];
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}
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}
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return true;
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}
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public function TAKFramesizeLookup($framesize) {
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static $TAKFramesizeLookup = array(
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0 => '94 ms',
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1 => '125 ms',
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2 => '188 ms',
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3 => '250 ms',
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4 => '4096 samples',
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5 => '8192 samples',
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6 => '16384 samples',
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7 => '512 samples',
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8 => '1024 samples',
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9 => '2048 samples'
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);
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return (isset($TAKFramesizeLookup[$framesize]) ? $TAKFramesizeLookup[$framesize] : 'invalid');
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}
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public function TAKCodecTypeLookup($code) {
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static $TAKCodecTypeLookup = array(
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0 => 'Integer 24 bit (TAK 1.0)',
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1 => 'Experimental!',
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2 => 'Integer 24 bit (TAK 2.0)',
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3 => 'LossyWav (TAK 2.1)',
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4 => 'Integer 24 bit MC (TAK 2.2)'
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);
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return (isset($TAKCodecTypeLookup[$code]) ? $TAKCodecTypeLookup[$code] : 'invalid');
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}
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public function TAKProfileLookup($code) {
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$out ='-p';
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$evaluation = ($code & 0xf0) >> 4;
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$compresion = $code & 0x0f;
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static $TAKEvaluationLookup = array(
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0 => '',
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1 => 'e',
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2 => 'm'
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);
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return (isset($TAKEvaluationLookup[$evaluation]) ? $out .= $compresion . $TAKEvaluationLookup[$evaluation] : 'invalid');
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}
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}
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