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Public Member Functions
getid3_tiff Class Reference

getID3() by James Heinrich info@.nosp@m.geti.nosp@m.d3.or.nosp@m.g // More...

+ Collaboration diagram for getid3_tiff:

Public Member Functions

 getid3_tiff (&$fd, &$ThisFileInfo)
 TIFFendian2Int ($bytestring, $byteorder)
 TIFFcompressionMethod ($id)
 TIFFcommentName ($id)

Detailed Description

getID3() by James Heinrich info@.nosp@m.geti.nosp@m.d3.or.nosp@m.g //

Definition at line 17 of file module.graphic.tiff.php.

Member Function Documentation

getid3_tiff::getid3_tiff ( &  $fd,
&  $ThisFileInfo 
)

Definition at line 20 of file module.graphic.tiff.php.

References TIFFcommentName(), TIFFcompressionMethod(), and TIFFendian2Int().

{
fseek($fd, $ThisFileInfo['avdataoffset'], SEEK_SET);
$TIFFheader = fread($fd, 4);
switch (substr($TIFFheader, 0, 2)) {
case 'II':
$ThisFileInfo['tiff']['byte_order'] = 'Intel';
break;
case 'MM':
$ThisFileInfo['tiff']['byte_order'] = 'Motorola';
break;
default:
$ThisFileInfo['error'][] = 'Invalid TIFF byte order identifier ('.substr($TIFFheader, 0, 2).') at offset '.$ThisFileInfo['avdataoffset'];
return false;
break;
}
$ThisFileInfo['fileformat'] = 'tiff';
$ThisFileInfo['video']['dataformat'] = 'tiff';
$ThisFileInfo['video']['lossless'] = true;
$ThisFileInfo['tiff']['ifd'] = array();
$CurrentIFD = array();
$FieldTypeByteLength = array(1=>1, 2=>1, 3=>2, 4=>4, 5=>8);
$nextIFDoffset = $this->TIFFendian2Int(fread($fd, 4), $ThisFileInfo['tiff']['byte_order']);
while ($nextIFDoffset > 0) {
$CurrentIFD['offset'] = $nextIFDoffset;
fseek($fd, $ThisFileInfo['avdataoffset'] + $nextIFDoffset, SEEK_SET);
$CurrentIFD['fieldcount'] = $this->TIFFendian2Int(fread($fd, 2), $ThisFileInfo['tiff']['byte_order']);
for ($i = 0; $i < $CurrentIFD['fieldcount']; $i++) {
$CurrentIFD['fields'][$i]['raw']['tag'] = $this->TIFFendian2Int(fread($fd, 2), $ThisFileInfo['tiff']['byte_order']);
$CurrentIFD['fields'][$i]['raw']['type'] = $this->TIFFendian2Int(fread($fd, 2), $ThisFileInfo['tiff']['byte_order']);
$CurrentIFD['fields'][$i]['raw']['length'] = $this->TIFFendian2Int(fread($fd, 4), $ThisFileInfo['tiff']['byte_order']);
$CurrentIFD['fields'][$i]['raw']['offset'] = fread($fd, 4);
switch ($CurrentIFD['fields'][$i]['raw']['type']) {
case 1: // BYTE An 8-bit unsigned integer.
if ($CurrentIFD['fields'][$i]['raw']['length'] <= 4) {
$CurrentIFD['fields'][$i]['value'] = $this->TIFFendian2Int(substr($CurrentIFD['fields'][$i]['raw']['offset'], 0, 1), $ThisFileInfo['tiff']['byte_order']);
} else {
$CurrentIFD['fields'][$i]['offset'] = $this->TIFFendian2Int($CurrentIFD['fields'][$i]['raw']['offset'], $ThisFileInfo['tiff']['byte_order']);
}
break;
case 2: // ASCII 8-bit bytes that store ASCII codes; the last byte must be null.
if ($CurrentIFD['fields'][$i]['raw']['length'] <= 4) {
$CurrentIFD['fields'][$i]['value'] = substr($CurrentIFD['fields'][$i]['raw']['offset'], 3);
} else {
$CurrentIFD['fields'][$i]['offset'] = $this->TIFFendian2Int($CurrentIFD['fields'][$i]['raw']['offset'], $ThisFileInfo['tiff']['byte_order']);
}
break;
case 3: // SHORT A 16-bit (2-byte) unsigned integer.
if ($CurrentIFD['fields'][$i]['raw']['length'] <= 2) {
$CurrentIFD['fields'][$i]['value'] = $this->TIFFendian2Int(substr($CurrentIFD['fields'][$i]['raw']['offset'], 0, 2), $ThisFileInfo['tiff']['byte_order']);
} else {
$CurrentIFD['fields'][$i]['offset'] = $this->TIFFendian2Int($CurrentIFD['fields'][$i]['raw']['offset'], $ThisFileInfo['tiff']['byte_order']);
}
break;
case 4: // LONG A 32-bit (4-byte) unsigned integer.
if ($CurrentIFD['fields'][$i]['raw']['length'] <= 1) {
$CurrentIFD['fields'][$i]['value'] = $this->TIFFendian2Int($CurrentIFD['fields'][$i]['raw']['offset'], $ThisFileInfo['tiff']['byte_order']);
} else {
$CurrentIFD['fields'][$i]['offset'] = $this->TIFFendian2Int($CurrentIFD['fields'][$i]['raw']['offset'], $ThisFileInfo['tiff']['byte_order']);
}
break;
case 5: // RATIONAL Two LONG_s: the first represents the numerator of a fraction, the second the denominator.
break;
}
}
$ThisFileInfo['tiff']['ifd'][] = $CurrentIFD;
$CurrentIFD = array();
$nextIFDoffset = $this->TIFFendian2Int(fread($fd, 4), $ThisFileInfo['tiff']['byte_order']);
}
foreach ($ThisFileInfo['tiff']['ifd'] as $IFDid => $IFDarray) {
foreach ($IFDarray['fields'] as $key => $fieldarray) {
switch ($fieldarray['raw']['tag']) {
case 256: // ImageWidth
case 257: // ImageLength
case 258: // BitsPerSample
case 259: // Compression
if (!isset($fieldarray['value'])) {
fseek($fd, $fieldarray['offset'], SEEK_SET);
$ThisFileInfo['tiff']['ifd'][$IFDid]['fields'][$key]['raw']['data'] = fread($fd, $fieldarray['raw']['length'] * $FieldTypeByteLength[$fieldarray['raw']['type']]);
}
break;
case 270: // ImageDescription
case 271: // Make
case 272: // Model
case 305: // Software
case 306: // DateTime
case 315: // Artist
case 316: // HostComputer
if (isset($fieldarray['value'])) {
$ThisFileInfo['tiff']['ifd'][$IFDid]['fields'][$key]['raw']['data'] = $fieldarray['value'];
} else {
fseek($fd, $fieldarray['offset'], SEEK_SET);
$ThisFileInfo['tiff']['ifd'][$IFDid]['fields'][$key]['raw']['data'] = fread($fd, $fieldarray['raw']['length'] * $FieldTypeByteLength[$fieldarray['raw']['type']]);
}
break;
}
switch ($fieldarray['raw']['tag']) {
case 256: // ImageWidth
$ThisFileInfo['video']['resolution_x'] = $fieldarray['value'];
break;
case 257: // ImageLength
$ThisFileInfo['video']['resolution_y'] = $fieldarray['value'];
break;
case 258: // BitsPerSample
if (isset($fieldarray['value'])) {
$ThisFileInfo['video']['bits_per_sample'] = $fieldarray['value'];
} else {
$ThisFileInfo['video']['bits_per_sample'] = 0;
for ($i = 0; $i < $fieldarray['raw']['length']; $i++) {
$ThisFileInfo['video']['bits_per_sample'] += $this->TIFFendian2Int(substr($ThisFileInfo['tiff']['ifd'][$IFDid]['fields'][$key]['raw']['data'], $i * $FieldTypeByteLength[$fieldarray['raw']['type']], $FieldTypeByteLength[$fieldarray['raw']['type']]), $ThisFileInfo['tiff']['byte_order']);
}
}
break;
case 259: // Compression
$ThisFileInfo['video']['codec'] = $this->TIFFcompressionMethod($fieldarray['value']);
break;
case 270: // ImageDescription
case 271: // Make
case 272: // Model
case 305: // Software
case 306: // DateTime
case 315: // Artist
case 316: // HostComputer
@$ThisFileInfo['tiff']['comments'][$this->TIFFcommentName($fieldarray['raw']['tag'])][] = $ThisFileInfo['tiff']['ifd'][$IFDid]['fields'][$key]['raw']['data'];
break;
default:
break;
}
}
}
return true;
}

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getid3_tiff::TIFFcommentName (   $id)

Definition at line 202 of file module.graphic.tiff.php.

Referenced by getid3_tiff().

{
static $TIFFcommentName = array();
if (empty($TIFFcommentName)) {
$TIFFcommentName = array(
270 => 'imagedescription',
271 => 'make',
272 => 'model',
305 => 'software',
306 => 'datetime',
315 => 'artist',
316 => 'hostcomputer',
);
}
return (isset($TIFFcommentName[$id]) ? $TIFFcommentName[$id] : 'unknown/invalid ('.$id.')');
}

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getid3_tiff::TIFFcompressionMethod (   $id)

Definition at line 188 of file module.graphic.tiff.php.

Referenced by getid3_tiff().

{
static $TIFFcompressionMethod = array();
if (empty($TIFFcompressionMethod)) {
$TIFFcompressionMethod = array(
1 => 'Uncompressed',
2 => 'Huffman',
3 => 'Fax - CCITT 3',
5 => 'LZW',
32773 => 'PackBits',
);
}
return (isset($TIFFcompressionMethod[$id]) ? $TIFFcompressionMethod[$id] : 'unknown/invalid ('.$id.')');
}

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getid3_tiff::TIFFendian2Int (   $bytestring,
  $byteorder 
)

Definition at line 179 of file module.graphic.tiff.php.

References getid3_lib\BigEndian2Int(), and getid3_lib\LittleEndian2Int().

Referenced by getid3_tiff().

{
if ($byteorder == 'Intel') {
return getid3_lib::LittleEndian2Int($bytestring);
} elseif ($byteorder == 'Motorola') {
return getid3_lib::BigEndian2Int($bytestring);
}
return false;
}

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The documentation for this class was generated from the following file: