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- #------------------------------------------------------------------------------
- # File: OpenEXR.pm
- #
- # Description: Read OpenEXR meta information
- #
- # Revisions: 2011/12/10 - P. Harvey Created
- #
- # References: 1) http://www.openexr.com/
- #------------------------------------------------------------------------------
- package Image::ExifTool::OpenEXR;
- use strict;
- use vars qw($VERSION);
- use Image::ExifTool qw(:DataAccess :Utils);
- $VERSION = '1.01';
- # supported EXR value format types (other types are extracted as undef binary data)
- my %formatType = (
- box2f => 'float[4]',
- box2i => 'int32s[4]',
- chlist => 1,
- chromaticities => 'float[8]',
- compression => 'int8u',
- double => 'double',
- envmap => 'int8u',
- float => 'float',
- 'int' => 'int32s',
- keycode => 'int32s[7]',
- lineOrder => 'int8u',
- m33f => 'float[9]',
- m44f => 'float[16]',
- rational => 'rational64s',
- string => 'string', # incorrect in specification! (no leading int)
- stringvector => 1,
- tiledesc => 1,
- timecode => 'int32u[2]',
- v2f => 'float[2]',
- v2i => 'int32s[2]',
- v3f => 'float[3]',
- v3i => 'int32s[3]',
- );
- # OpenEXR tags
- %Image::ExifTool::OpenEXR::Main = (
- GROUPS => { 2 => 'Image' },
- NOTES => q{
- Information extracted from EXR images. See L<http://www.openexr.com/> for
- the official specification.
- },
- _ver => { Name => 'EXRVersion' },
- _lay => {
- Name => 'Layout',
- PrintHex => 1,
- PrintConv => { 0 => 'Scan Lines', 0x200 => 'Tiles' },
- },
- adoptedNeutral => { },
- altitude => {
- Name => 'GPSAltitude',
- Groups => { 2 => 'Location' },
- PrintConv => q{
- $val = int($val * 10) / 10;
- return ($val =~ s/^-// ? "$val m Below" : "$val m Above") . " Sea Level";
- },
- },
- aperture => { PrintConv => 'sprintf("%.1f",$val)' },
- channels => { },
- chromaticities => { },
- capDate => {
- Name => 'DateTimeOriginal',
- Groups => { 2 => 'Time' },
- PrintConv => '$self->ConvertDateTime($val)',
- },
- comments => { },
- compression => {
- PrintConvColumns => 2,
- PrintConv => {
- 0 => 'None',
- 1 => 'RLE',
- 2 => 'ZIPS',
- 3 => 'ZIP',
- 4 => 'PIZ',
- 5 => 'PXR24',
- 6 => 'B44',
- 7 => 'B44A',
- },
- },
- dataWindow => { },
- displayWindow => { },
- envmap => {
- Name => 'EnvironmentMap',
- PrintConv => {
- 0 => 'Latitude/Longitude',
- 1 => 'Cube',
- },
- },
- expTime => {
- Name => 'ExposureTime',
- PrintConv => 'Image::ExifTool::Exif::PrintExposureTime($val)',
- },
- focus => {
- Name => 'FocusDistance',
- PrintConv => '"$val m"',
- },
- framesPerSecond => { },
- keyCode => { },
- isoSpeed => { Name => 'ISO' },
- latitude => {
- Name => 'GPSLatitude',
- Groups => { 2 => 'Location' },
- RawConv => 'require Image::ExifTool::GPS; $val', # to load Composite tags and routines
- PrintConv => 'Image::ExifTool::GPS::ToDMS($self, $val, 1, "N")',
- },
- lineOrder => {
- PrintConv => {
- 0 => 'Increasing Y',
- 1 => 'Decreasing Y',
- 2 => 'Random Y',
- },
- },
- longitude => {
- Name => 'GPSLongitude',
- Groups => { 2 => 'Location' },
- RawConv => 'require Image::ExifTool::GPS; $val', # to load Composite tags and routines
- PrintConv => 'Image::ExifTool::GPS::ToDMS($self, $val, 1, "E")',
- },
- lookModTransform => { },
- multiView => { },
- owner => { Groups => { 2 => 'Author' } },
- pixelAspectRatio => { },
- preview => { },
- renderingTransform => { },
- screenWindowCenter => { },
- screenWindowWidth => { },
- tiles => { },
- timeCode => { },
- utcOffset => {
- Name => 'TimeZone',
- Groups => { 2 => 'Time' },
- PrintConv => 'TimeZoneString($val / 60)',
- },
- whiteLuminance => { },
- worldToCamera => { },
- worldToNDC => { },
- wrapmodes => { Name => 'WrapModes' },
- xDensity => { Name => 'XResolution' },
- # also observed:
- # ilut
- );
- #------------------------------------------------------------------------------
- # Extract information from an OpenEXR file
- # Inputs: 0) ExifTool object reference, 1) DirInfo reference
- # Returns: 1 on success, 0 if this wasn't a valid OpenEXR file
- sub ProcessEXR($$)
- {
- my ($et, $dirInfo) = @_;
- my $raf = $$dirInfo{RAF};
- my $verbose = $et->Options('Verbose');
- my $binary = $et->Options('Binary') || $verbose;
- my ($buff, $buf2, $dim);
- # verify this is a valid RIFF file
- return 0 unless $raf->Read($buff, 8) == 8;
- return 0 unless $buff =~ /^\x76\x2f\x31\x01/s;
- $et->SetFileType();
- SetByteOrder('II');
- my $tagTablePtr = GetTagTable('Image::ExifTool::OpenEXR::Main');
- # extract information from header
- my $ver = unpack('x4V', $buff);
- $et->HandleTag($tagTablePtr, '_ver', $ver & 0xff);
- $et->HandleTag($tagTablePtr, '_lay', $ver & 0x200);
- # extract attributes
- for (;;) {
- $raf->Read($buff, 68) or last;
- last if $buff =~ /^\0/;
- unless ($buff =~ /^([^\0]{1,31})\0([^\0]{1,31})\0(.{4})/sg) {
- $et->Warn('EXR format error');
- last;
- }
- my ($tag, $type, $size) = ($1, $2, unpack('V', $3));
- unless ($raf->Seek(pos($buff) - length($buff), 1)) {
- $et->Warn('Seek error');
- last;
- }
- my $tagInfo = $et->GetTagInfo($tagTablePtr, $tag);
- unless ($tagInfo) {
- my $name = ucfirst $tag;
- $name =~ tr/-_a-zA-Z0-9//dc;
- if (length $name <= 1) {
- if (length $name) {
- $name = "Tag$name";
- } else {
- $name = 'Invalid';
- }
- }
- $tagInfo = { Name => $name, WasAdded => 1 };
- AddTagToTable($tagTablePtr, $tag, $tagInfo);
- $et->VPrint(0, $$et{INDENT}, "[adding $tag]\n");
- }
- my ($val, $success);
- my $format = $formatType{$type};
- if ($format or $binary) {
- $raf->Read($buff, $size) == $size and $success = 1;
- if (not $format) {
- $val = \$buff; # treat as undef binary data
- } elsif ($format ne '1') {
- # handle formats which map nicely into ExifTool format codes
- if ($format =~ /^(\w+)\[?(\d*)/) {
- my ($fmt, $cnt) = ($1, $2);
- $cnt = $fmt eq 'string' ? $size : 1 unless $cnt;
- $val = ReadValue(\$buff, 0, $fmt, $cnt, $size);
- }
- # handle other format types
- } elsif ($type eq 'tiledesc') {
- if ($size >= 9) {
- my $x = Get32u(\$buff, 0);
- my $y = Get32u(\$buff, 4);
- my $mode = Get8u(\$buff, 8);
- my $lvl = { 0 => 'One Level', 1 => 'MIMAP Levels', 2 => 'RIPMAP Levels' }->{$mode & 0x0f};
- $lvl or $lvl = 'Unknown Levels (' . ($mode & 0xf) . ')';
- my $rnd = { 0 => 'Round Down', 1 => 'Round Up' }->{$mode >> 4};
- $rnd or $rnd = 'Unknown Rounding (' . ($mode >> 4) . ')';
- $val = "${x}x$y; $lvl; $rnd";
- }
- } elsif ($type eq 'chlist') {
- $val = [ ];
- while ($buff =~ /\G([^\0]{1,31})\0(.{16})/sg) {
- my ($str, $dat) = ($1, $2);
- my ($pix,$lin,$x,$y) = unpack('VCx3VV', $dat);
- $pix = { 0 => 'int8u', 1 => 'half', 2 => 'float' }->{$pix} || "unknown($pix)";
- push @$val, "$str $pix" . ($lin ? ' linear' : '') . " $x $y";
- }
- } elsif ($type eq 'stringvector') {
- $val = [ ];
- my $pos = 0;
- while ($pos + 4 <= length($buff)) {
- my $len = Get32u(\$buff, $pos);
- last if $pos + 4 + $len > length($buff);
- push @$val, substr($buff, $pos + 4, $len);
- $pos += 4 + $len;
- }
- } else {
- $val = \$buff; # (shouldn't happen)
- }
- } else {
- # avoid loading binary data
- $val = \ "Binary data $size bytes";
- $success = $raf->Seek($size, 1);
- }
- unless ($success) {
- $et->Warn('Truncated or corrupted EXR file');
- last;
- }
- $val = '<bad>' unless defined $val;
- # take image dimensions from dataWindow (with displayWindow as backup)
- if (($tag eq 'dataWindow' or (not $dim and $tag eq 'displayWindow')) and
- $val =~ /^(-?\d+) (-?\d+) (-?\d+) (-?\d+)$/)
- {
- $dim = [$3 - $1 + 1, $4 - $2 + 1];
- }
- if ($verbose) {
- my $dataPt = ref $val ? $val : \$val,
- $et->VerboseInfo($tag, $tagInfo,
- Table => $tagTablePtr,
- Value => $val,
- Size => $size,
- Format => $type,
- DataPt => \$buff,
- Addr => $raf->Tell() - $size,
- );
- }
- $et->FoundTag($tagInfo, $val);
- }
- if ($dim) {
- $et->FoundTag('ImageWidth', $$dim[0]);
- $et->FoundTag('ImageHeight', $$dim[1]);
- }
- return 1;
- }
- 1; # end
- __END__
- =head1 NAME
- Image::ExifTool::OpenEXR - Read OpenEXR meta information
- =head1 SYNOPSIS
- This module is used by Image::ExifTool
- =head1 DESCRIPTION
- This module contains definitions required by Image::ExifTool to extract meta
- information from OpenEXR images.
- =head1 AUTHOR
- Copyright 2003-2016, Phil Harvey (phil at owl.phy.queensu.ca)
- This library is free software; you can redistribute it and/or modify it
- under the same terms as Perl itself.
- =head1 REFERENCES
- =over 4
- =item L<http://www.openexr.com/documentation.html>
- =back
- =head1 SEE ALSO
- L<Image::ExifTool::TagNames/OpenEXR Tags>,
- L<Image::ExifTool(3pm)|Image::ExifTool>
- =cut
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