227 lines
8.4 KiB
PHP
227 lines
8.4 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 http://www.getid3.org //
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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.archive.tiff.php //
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// module for analyzing TIFF files //
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// dependencies: NONE //
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// ///
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/////////////////////////////////////////////////////////////////
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class getid3_tiff extends getid3_handler
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{
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function Analyze() {
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$info = &$this->getid3->info;
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fseek($this->getid3->fp, $info['avdataoffset'], SEEK_SET);
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$TIFFheader = fread($this->getid3->fp, 4);
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switch (substr($TIFFheader, 0, 2)) {
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case 'II':
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$info['tiff']['byte_order'] = 'Intel';
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break;
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case 'MM':
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$info['tiff']['byte_order'] = 'Motorola';
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break;
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default:
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$info['error'][] = 'Invalid TIFF byte order identifier ('.substr($TIFFheader, 0, 2).') at offset '.$info['avdataoffset'];
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return false;
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break;
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}
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$info['fileformat'] = 'tiff';
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$info['video']['dataformat'] = 'tiff';
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$info['video']['lossless'] = true;
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$info['tiff']['ifd'] = array();
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$CurrentIFD = array();
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$FieldTypeByteLength = array(1=>1, 2=>1, 3=>2, 4=>4, 5=>8);
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$nextIFDoffset = $this->TIFFendian2Int(fread($this->getid3->fp, 4), $info['tiff']['byte_order']);
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while ($nextIFDoffset > 0) {
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$CurrentIFD['offset'] = $nextIFDoffset;
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fseek($this->getid3->fp, $info['avdataoffset'] + $nextIFDoffset, SEEK_SET);
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$CurrentIFD['fieldcount'] = $this->TIFFendian2Int(fread($this->getid3->fp, 2), $info['tiff']['byte_order']);
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for ($i = 0; $i < $CurrentIFD['fieldcount']; $i++) {
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$CurrentIFD['fields'][$i]['raw']['tag'] = $this->TIFFendian2Int(fread($this->getid3->fp, 2), $info['tiff']['byte_order']);
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$CurrentIFD['fields'][$i]['raw']['type'] = $this->TIFFendian2Int(fread($this->getid3->fp, 2), $info['tiff']['byte_order']);
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$CurrentIFD['fields'][$i]['raw']['length'] = $this->TIFFendian2Int(fread($this->getid3->fp, 4), $info['tiff']['byte_order']);
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$CurrentIFD['fields'][$i]['raw']['offset'] = fread($this->getid3->fp, 4);
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switch ($CurrentIFD['fields'][$i]['raw']['type']) {
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case 1: // BYTE An 8-bit unsigned integer.
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if ($CurrentIFD['fields'][$i]['raw']['length'] <= 4) {
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$CurrentIFD['fields'][$i]['value'] = $this->TIFFendian2Int(substr($CurrentIFD['fields'][$i]['raw']['offset'], 0, 1), $info['tiff']['byte_order']);
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} else {
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$CurrentIFD['fields'][$i]['offset'] = $this->TIFFendian2Int($CurrentIFD['fields'][$i]['raw']['offset'], $info['tiff']['byte_order']);
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}
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break;
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case 2: // ASCII 8-bit bytes that store ASCII codes; the last byte must be null.
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if ($CurrentIFD['fields'][$i]['raw']['length'] <= 4) {
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$CurrentIFD['fields'][$i]['value'] = substr($CurrentIFD['fields'][$i]['raw']['offset'], 3);
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} else {
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$CurrentIFD['fields'][$i]['offset'] = $this->TIFFendian2Int($CurrentIFD['fields'][$i]['raw']['offset'], $info['tiff']['byte_order']);
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}
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break;
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case 3: // SHORT A 16-bit (2-byte) unsigned integer.
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if ($CurrentIFD['fields'][$i]['raw']['length'] <= 2) {
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$CurrentIFD['fields'][$i]['value'] = $this->TIFFendian2Int(substr($CurrentIFD['fields'][$i]['raw']['offset'], 0, 2), $info['tiff']['byte_order']);
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} else {
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$CurrentIFD['fields'][$i]['offset'] = $this->TIFFendian2Int($CurrentIFD['fields'][$i]['raw']['offset'], $info['tiff']['byte_order']);
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}
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break;
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case 4: // LONG A 32-bit (4-byte) unsigned integer.
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if ($CurrentIFD['fields'][$i]['raw']['length'] <= 1) {
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$CurrentIFD['fields'][$i]['value'] = $this->TIFFendian2Int($CurrentIFD['fields'][$i]['raw']['offset'], $info['tiff']['byte_order']);
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} else {
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$CurrentIFD['fields'][$i]['offset'] = $this->TIFFendian2Int($CurrentIFD['fields'][$i]['raw']['offset'], $info['tiff']['byte_order']);
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}
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break;
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case 5: // RATIONAL Two LONG_s: the first represents the numerator of a fraction, the second the denominator.
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break;
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}
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}
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$info['tiff']['ifd'][] = $CurrentIFD;
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$CurrentIFD = array();
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$nextIFDoffset = $this->TIFFendian2Int(fread($this->getid3->fp, 4), $info['tiff']['byte_order']);
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}
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foreach ($info['tiff']['ifd'] as $IFDid => $IFDarray) {
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foreach ($IFDarray['fields'] as $key => $fieldarray) {
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switch ($fieldarray['raw']['tag']) {
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case 256: // ImageWidth
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case 257: // ImageLength
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case 258: // BitsPerSample
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case 259: // Compression
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if (!isset($fieldarray['value'])) {
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fseek($this->getid3->fp, $fieldarray['offset'], SEEK_SET);
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$info['tiff']['ifd'][$IFDid]['fields'][$key]['raw']['data'] = fread($this->getid3->fp, $fieldarray['raw']['length'] * $FieldTypeByteLength[$fieldarray['raw']['type']]);
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}
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break;
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case 270: // ImageDescription
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case 271: // Make
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case 272: // Model
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case 305: // Software
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case 306: // DateTime
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case 315: // Artist
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case 316: // HostComputer
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if (isset($fieldarray['value'])) {
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$info['tiff']['ifd'][$IFDid]['fields'][$key]['raw']['data'] = $fieldarray['value'];
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} else {
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fseek($this->getid3->fp, $fieldarray['offset'], SEEK_SET);
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$info['tiff']['ifd'][$IFDid]['fields'][$key]['raw']['data'] = fread($this->getid3->fp, $fieldarray['raw']['length'] * $FieldTypeByteLength[$fieldarray['raw']['type']]);
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}
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break;
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}
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switch ($fieldarray['raw']['tag']) {
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case 256: // ImageWidth
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$info['video']['resolution_x'] = $fieldarray['value'];
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break;
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case 257: // ImageLength
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$info['video']['resolution_y'] = $fieldarray['value'];
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break;
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case 258: // BitsPerSample
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if (isset($fieldarray['value'])) {
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$info['video']['bits_per_sample'] = $fieldarray['value'];
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} else {
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$info['video']['bits_per_sample'] = 0;
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for ($i = 0; $i < $fieldarray['raw']['length']; $i++) {
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$info['video']['bits_per_sample'] += $this->TIFFendian2Int(substr($info['tiff']['ifd'][$IFDid]['fields'][$key]['raw']['data'], $i * $FieldTypeByteLength[$fieldarray['raw']['type']], $FieldTypeByteLength[$fieldarray['raw']['type']]), $info['tiff']['byte_order']);
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}
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}
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break;
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case 259: // Compression
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$info['video']['codec'] = $this->TIFFcompressionMethod($fieldarray['value']);
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break;
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case 270: // ImageDescription
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case 271: // Make
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case 272: // Model
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case 305: // Software
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case 306: // DateTime
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case 315: // Artist
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case 316: // HostComputer
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$TIFFcommentName = $this->TIFFcommentName($fieldarray['raw']['tag']);
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if (isset($info['tiff']['comments'][$TIFFcommentName])) {
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$info['tiff']['comments'][$TIFFcommentName][] = $info['tiff']['ifd'][$IFDid]['fields'][$key]['raw']['data'];
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} else {
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$info['tiff']['comments'][$TIFFcommentName] = array($info['tiff']['ifd'][$IFDid]['fields'][$key]['raw']['data']);
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}
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break;
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default:
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break;
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}
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}
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}
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return true;
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}
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function TIFFendian2Int($bytestring, $byteorder) {
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if ($byteorder == 'Intel') {
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return getid3_lib::LittleEndian2Int($bytestring);
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} elseif ($byteorder == 'Motorola') {
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return getid3_lib::BigEndian2Int($bytestring);
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}
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return false;
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}
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function TIFFcompressionMethod($id) {
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static $TIFFcompressionMethod = array();
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if (empty($TIFFcompressionMethod)) {
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$TIFFcompressionMethod = array(
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1 => 'Uncompressed',
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2 => 'Huffman',
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3 => 'Fax - CCITT 3',
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5 => 'LZW',
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32773 => 'PackBits',
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);
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}
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return (isset($TIFFcompressionMethod[$id]) ? $TIFFcompressionMethod[$id] : 'unknown/invalid ('.$id.')');
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}
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function TIFFcommentName($id) {
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static $TIFFcommentName = array();
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if (empty($TIFFcommentName)) {
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$TIFFcommentName = array(
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270 => 'imagedescription',
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271 => 'make',
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272 => 'model',
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305 => 'software',
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306 => 'datetime',
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315 => 'artist',
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316 => 'hostcomputer',
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);
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}
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return (isset($TIFFcommentName[$id]) ? $TIFFcommentName[$id] : 'unknown/invalid ('.$id.')');
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}
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}
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?>
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