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<?php
/////////////////////////////////////////////////////////////////
/// getID3() by James Heinrich <info@getid3.org> //
// available at http://getid3.sourceforge.net //
// or https://www.getid3.org //
// also https://github.com/JamesHeinrich/getID3 //
/////////////////////////////////////////////////////////////////
// See readme.txt for more details //
/////////////////////////////////////////////////////////////////
// //
// module.audio.tak.php //
// module for analyzing Tom's lossless Audio Kompressor //
// dependencies: NONE //
// ///
/////////////////////////////////////////////////////////////////
if (!defined('GETID3_INCLUDEPATH')) { // prevent path-exposing attacks that access modules directly on public webservers
exit;
}
class getid3_tak extends getid3_handler
{
/**
* @return bool
*/
public function Analyze() {
$info = &$this->getid3->info;
$info['fileformat'] = 'tak';
$info['audio']['dataformat'] = 'tak';
$info['audio']['bitrate_mode'] = 'vbr';
$info['audio']['lossless'] = true;
$info['tak_audio']['raw'] = array();
$thisfile_takaudio = &$info['tak_audio'];
$thisfile_takaudio_raw = &$thisfile_takaudio['raw'];
$this->fseek($info['avdataoffset']);
$TAKMetaData = $this->fread(4);
$thisfile_takaudio_raw['magic'] = $TAKMetaData;
$magic = 'tBaK';
if ($thisfile_takaudio_raw['magic'] != $magic) {
$this->error('Expecting "'.getid3_lib::PrintHexBytes($magic).'" at offset '.$info['avdataoffset'].', found "'.getid3_lib::PrintHexBytes($thisfile_takaudio_raw['magic']).'"');
unset($info['fileformat']);
return false;
}
$offset = 4; //skip magic
$this->fseek($offset);
$TAKMetaData = $this->fread(4); //read Metadata Block Header
$objtype = getid3_lib::BigEndian2Int(substr($TAKMetaData, 0, 1)); //Metadata Block Object Type
$objlength = getid3_lib::LittleEndian2Int(substr($TAKMetaData, 1, 3)); //Metadata Block Object Lenght excluding header
if ($objtype == 1) { //The First Metadata Block Object must be of Type 1 (STREAMINFO)
$offset += 4; //skip to Metadata Block contents
$this->fseek($offset);
$TAKMetaData = $this->fread($objlength); // Get the raw Metadata Block Data
$thisfile_takaudio_raw['STREAMINFO'] = getid3_lib::LittleEndian2Bin(substr($TAKMetaData, 0, $objlength - 3));
$offset += $objlength; // Move to the next Metadata Block Object
$thisfile_takaudio['channels'] = getid3_lib::Bin2Dec(substr($thisfile_takaudio_raw['STREAMINFO'], 1, 4)) + 1;
$thisfile_takaudio['bits_per_sample'] = getid3_lib::Bin2Dec(substr($thisfile_takaudio_raw['STREAMINFO'], 5, 5)) + 8;
$thisfile_takaudio['sample_rate'] = getid3_lib::Bin2Dec(substr($thisfile_takaudio_raw['STREAMINFO'], 10, 18)) + 6000;
$thisfile_takaudio['samples'] = getid3_lib::Bin2Dec(substr($thisfile_takaudio_raw['STREAMINFO'], 31, 35));
$thisfile_takaudio['framesize'] = self::TAKFramesizeLookup(getid3_lib::Bin2Dec(substr($thisfile_takaudio_raw['STREAMINFO'], 66, 4)));
$thisfile_takaudio['codectype'] = self::TAKCodecTypeLookup(getid3_lib::Bin2Dec(substr($thisfile_takaudio_raw['STREAMINFO'], 74, 6)));
} else {
$this->error('Expecting Type 1 (STREAMINFO) Metadata Object header, but found Type "'.$objtype.'" Object instead');
unset($info['fileformat']);
return false;
}
$this->fseek($offset);
$TAKMetaData = $this->fread(4);
$objtype = getid3_lib::BigEndian2Int(substr($TAKMetaData, 0, 1));
$objlength = getid3_lib::LittleEndian2Int(substr($TAKMetaData, 1, 3));
while ($objtype != 0) {
switch ($objtype) {
case 4 :
// ENCODERINFO Metadata Block
$offset += 4;
$this->fseek($offset);
$TAKMetaData = $this->fread($objlength);
$ver = getid3_lib::LittleEndian2Int(substr($TAKMetaData, 0, 3));
$major = ($ver & 0xff0000) >> 16;
$minor = ($ver & 0x00ff00) >> 8;
$revision= $ver & 0x0000ff;
$thisfile_takaudio['version'] = 'TAK V '.$major.'.'.$minor.'.'.$revision;
$thisfile_takaudio['profile'] = self::TAKProfileLookup(getid3_lib::BigEndian2Int(substr($TAKMetaData, 3, 1)));
$offset += $objlength;
break;
case 6 :
// MD5 Checksum Metadata Block
$offset += 4;
$this->fseek($offset);
$TAKMetaData = $this->fread($objlength);
$thisfile_takaudio_raw['MD5Data'] = substr($TAKMetaData, 0, 16);
$offset += $objlength;
break;
case 7 :
// LASTFRAME Metadata Block
$offset += 4;
$this->fseek($offset);
$TAKMetaData = $this->fread($objlength);
$thisfile_takaudio['lastframe_pos'] = getid3_lib::LittleEndian2Int(substr($TAKMetaData, 0, 5));
$thisfile_takaudio['last_frame_size'] = getid3_lib::LittleEndian2Int(substr($TAKMetaData, 5, 3));
$offset += $objlength;
break;
case 3 :
// ORIGINALFILEDATA Metadata Block
$offset += 4;
$this->fseek($offset);
$TAKMetaData = $this->fread($objlength);
$headersize = getid3_lib::LittleEndian2Int(substr($TAKMetaData, 0, 3));
$footersize = getid3_lib::LittleEndian2Int(substr($TAKMetaData, 3, 3));
if ($headersize) $thisfile_takaudio_raw['header_data'] = substr($TAKMetaData, 6, $headersize);
if ($footersize) $thisfile_takaudio_raw['footer_data'] = substr($TAKMetaData, $headersize, $footersize);
$offset += $objlength;
break;
default :
// PADDING or SEEKTABLE Metadata Block. Just skip it
$offset += 4;
$this->fseek($offset);
$TAKMetaData = $this->fread($objlength);
$offset += $objlength;
break;
}
$this->fseek($offset);
$TAKMetaData = $this->fread(4);
$objtype = getid3_lib::BigEndian2Int(substr($TAKMetaData, 0, 1));
$objlength = getid3_lib::LittleEndian2Int(substr($TAKMetaData, 1, 3));
}
// Finished all Metadata Blocks. So update $info['avdataoffset'] because next block is the first Audio data block
$info['avdataoffset'] = $offset;
$info['audio']['channels'] = $thisfile_takaudio['channels'];
if ($thisfile_takaudio['sample_rate'] == 0) {
$this->error('Corrupt TAK file: samplerate == zero');
return false;
}
$info['audio']['sample_rate'] = $thisfile_takaudio['sample_rate'];
$thisfile_takaudio['playtime'] = $thisfile_takaudio['samples'] / $thisfile_takaudio['sample_rate'];
if ($thisfile_takaudio['playtime'] == 0) {
$this->error('Corrupt TAK file: playtime == zero');
return false;
}
$info['playtime_seconds'] = $thisfile_takaudio['playtime'];
$thisfile_takaudio['compressed_size'] = $info['avdataend'] - $info['avdataoffset'];
$thisfile_takaudio['uncompressed_size'] = $thisfile_takaudio['samples'] * $thisfile_takaudio['channels'] * ($thisfile_takaudio['bits_per_sample'] / 8);
if ($thisfile_takaudio['uncompressed_size'] == 0) {
$this->error('Corrupt TAK file: uncompressed_size == zero');
return false;
}
$thisfile_takaudio['compression_ratio'] = $thisfile_takaudio['compressed_size'] / ($thisfile_takaudio['uncompressed_size'] + $offset);
$thisfile_takaudio['bitrate'] = (($thisfile_takaudio['samples'] * $thisfile_takaudio['channels'] * $thisfile_takaudio['bits_per_sample']) / $thisfile_takaudio['playtime']) * $thisfile_takaudio['compression_ratio'];
$info['audio']['bitrate'] = $thisfile_takaudio['bitrate'];
if (empty($thisfile_takaudio_raw['MD5Data'])) {
//$this->warning('MD5Data is not set');
} elseif ($thisfile_takaudio_raw['MD5Data'] === str_repeat("\x00", 16)) {
//$this->warning('MD5Data is null');
} else {
$info['md5_data_source'] = '';
$md5 = $thisfile_takaudio_raw['MD5Data'];
for ($i = 0; $i < strlen($md5); $i++) {
$info['md5_data_source'] .= str_pad(dechex(ord($md5[$i])), 2, '00', STR_PAD_LEFT);
}
if (!preg_match('/^[0-9a-f]{32}$/', $info['md5_data_source'])) {
unset($info['md5_data_source']);
}
}
foreach (array('bits_per_sample', 'version', 'profile') as $key) {
if (!empty($thisfile_takaudio[$key])) {
$info['audio'][$key] = $thisfile_takaudio[$key];
}
}
return true;
}
public function TAKFramesizeLookup($framesize) {
static $TAKFramesizeLookup = array(
0 => '94 ms',
1 => '125 ms',
2 => '188 ms',
3 => '250 ms',
4 => '4096 samples',
5 => '8192 samples',
6 => '16384 samples',
7 => '512 samples',
8 => '1024 samples',
9 => '2048 samples'
);
return (isset($TAKFramesizeLookup[$framesize]) ? $TAKFramesizeLookup[$framesize] : 'invalid');
}
public function TAKCodecTypeLookup($code) {
static $TAKCodecTypeLookup = array(
0 => 'Integer 24 bit (TAK 1.0)',
1 => 'Experimental!',
2 => 'Integer 24 bit (TAK 2.0)',
3 => 'LossyWav (TAK 2.1)',
4 => 'Integer 24 bit MC (TAK 2.2)'
);
return (isset($TAKCodecTypeLookup[$code]) ? $TAKCodecTypeLookup[$code] : 'invalid');
}
public function TAKProfileLookup($code) {
$out ='-p';
$evaluation = ($code & 0xf0) >> 4;
$compresion = $code & 0x0f;
static $TAKEvaluationLookup = array(
0 => '',
1 => 'e',
2 => 'm'
);
return (isset($TAKEvaluationLookup[$evaluation]) ? $out .= $compresion . $TAKEvaluationLookup[$evaluation] : 'invalid');
}
}
|
