324 lines
10 KiB
Perl
324 lines
10 KiB
Perl
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#------------------------------------------------------------------------------
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# File: OpenEXR.pm
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#
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# Description: Read OpenEXR meta information
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#
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# Revisions: 2011/12/10 - P. Harvey Created
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#
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# References: 1) http://www.openexr.com/
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#------------------------------------------------------------------------------
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package Image::ExifTool::OpenEXR;
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use strict;
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use vars qw($VERSION);
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use Image::ExifTool qw(:DataAccess :Utils);
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use Image::ExifTool::GPS;
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$VERSION = '1.02';
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# supported EXR value format types (other types are extracted as undef binary data)
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my %formatType = (
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box2f => 'float[4]',
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box2i => 'int32s[4]',
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chlist => 1,
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chromaticities => 'float[8]',
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compression => 'int8u',
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double => 'double',
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envmap => 'int8u',
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float => 'float',
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'int' => 'int32s',
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keycode => 'int32s[7]',
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lineOrder => 'int8u',
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m33f => 'float[9]',
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m44f => 'float[16]',
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rational => 'rational64s',
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string => 'string', # incorrect in specification! (no leading int)
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stringvector => 1,
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tiledesc => 1,
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timecode => 'int32u[2]',
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v2f => 'float[2]',
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v2i => 'int32s[2]',
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v3f => 'float[3]',
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v3i => 'int32s[3]',
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);
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# OpenEXR tags
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%Image::ExifTool::OpenEXR::Main = (
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GROUPS => { 2 => 'Image' },
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NOTES => q{
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Information extracted from EXR images. See L<http://www.openexr.com/> for
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the official specification.
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},
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_ver => { Name => 'EXRVersion' },
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_lay => {
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Name => 'Layout',
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PrintHex => 1,
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PrintConv => { 0 => 'Scan Lines', 0x200 => 'Tiles' },
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},
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adoptedNeutral => { },
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altitude => {
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Name => 'GPSAltitude',
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Groups => { 2 => 'Location' },
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PrintConv => q{
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$val = int($val * 10) / 10;
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return ($val =~ s/^-// ? "$val m Below" : "$val m Above") . " Sea Level";
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},
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},
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aperture => { PrintConv => 'sprintf("%.1f",$val)' },
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channels => { },
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chromaticities => { },
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capDate => {
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Name => 'DateTimeOriginal',
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Groups => { 2 => 'Time' },
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PrintConv => '$self->ConvertDateTime($val)',
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},
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comments => { },
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compression => {
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PrintConvColumns => 2,
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PrintConv => {
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0 => 'None',
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1 => 'RLE',
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2 => 'ZIPS',
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3 => 'ZIP',
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4 => 'PIZ',
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5 => 'PXR24',
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6 => 'B44',
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7 => 'B44A',
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},
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},
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dataWindow => { },
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displayWindow => { },
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envmap => {
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Name => 'EnvironmentMap',
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PrintConv => {
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0 => 'Latitude/Longitude',
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1 => 'Cube',
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},
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},
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expTime => {
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Name => 'ExposureTime',
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PrintConv => 'Image::ExifTool::Exif::PrintExposureTime($val)',
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},
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focus => {
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Name => 'FocusDistance',
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PrintConv => '"$val m"',
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},
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framesPerSecond => { },
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keyCode => { },
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isoSpeed => { Name => 'ISO' },
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latitude => {
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Name => 'GPSLatitude',
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Groups => { 2 => 'Location' },
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PrintConv => 'Image::ExifTool::GPS::ToDMS($self, $val, 1, "N")',
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},
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lineOrder => {
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PrintConv => {
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0 => 'Increasing Y',
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1 => 'Decreasing Y',
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2 => 'Random Y',
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},
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},
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longitude => {
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Name => 'GPSLongitude',
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Groups => { 2 => 'Location' },
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PrintConv => 'Image::ExifTool::GPS::ToDMS($self, $val, 1, "E")',
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},
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lookModTransform => { },
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multiView => { },
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owner => { Groups => { 2 => 'Author' } },
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pixelAspectRatio => { },
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preview => { },
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renderingTransform => { },
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screenWindowCenter => { },
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screenWindowWidth => { },
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tiles => { },
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timeCode => { },
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utcOffset => {
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Name => 'TimeZone',
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Groups => { 2 => 'Time' },
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PrintConv => 'TimeZoneString($val / 60)',
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},
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whiteLuminance => { },
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worldToCamera => { },
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worldToNDC => { },
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wrapmodes => { Name => 'WrapModes' },
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xDensity => { Name => 'XResolution' },
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# also observed:
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# ilut
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);
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#------------------------------------------------------------------------------
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# Extract information from an OpenEXR file
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# Inputs: 0) ExifTool object reference, 1) DirInfo reference
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# Returns: 1 on success, 0 if this wasn't a valid OpenEXR file
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sub ProcessEXR($$)
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{
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my ($et, $dirInfo) = @_;
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my $raf = $$dirInfo{RAF};
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my $verbose = $et->Options('Verbose');
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my $binary = $et->Options('Binary') || $verbose;
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my ($buff, $buf2, $dim);
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# verify this is a valid RIFF file
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return 0 unless $raf->Read($buff, 8) == 8;
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return 0 unless $buff =~ /^\x76\x2f\x31\x01/s;
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$et->SetFileType();
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SetByteOrder('II');
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my $tagTablePtr = GetTagTable('Image::ExifTool::OpenEXR::Main');
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# extract information from header
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my $ver = unpack('x4V', $buff);
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$et->HandleTag($tagTablePtr, '_ver', $ver & 0xff);
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$et->HandleTag($tagTablePtr, '_lay', $ver & 0x200);
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# extract attributes
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for (;;) {
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$raf->Read($buff, 68) or last;
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last if $buff =~ /^\0/;
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unless ($buff =~ /^([^\0]{1,31})\0([^\0]{1,31})\0(.{4})/sg) {
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$et->Warn('EXR format error');
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last;
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}
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my ($tag, $type, $size) = ($1, $2, unpack('V', $3));
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unless ($raf->Seek(pos($buff) - length($buff), 1)) {
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$et->Warn('Seek error');
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last;
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}
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my $tagInfo = $et->GetTagInfo($tagTablePtr, $tag);
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unless ($tagInfo) {
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my $name = ucfirst $tag;
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$name =~ tr/-_a-zA-Z0-9//dc;
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if (length $name <= 1) {
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if (length $name) {
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$name = "Tag$name";
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} else {
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$name = 'Invalid';
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}
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}
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$tagInfo = { Name => $name, WasAdded => 1 };
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AddTagToTable($tagTablePtr, $tag, $tagInfo);
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$et->VPrint(0, $$et{INDENT}, "[adding $tag]\n");
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}
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my ($val, $success);
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my $format = $formatType{$type};
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if ($format or $binary) {
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$raf->Read($buff, $size) == $size and $success = 1;
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if (not $format) {
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$val = \$buff; # treat as undef binary data
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} elsif ($format ne '1') {
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# handle formats which map nicely into ExifTool format codes
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if ($format =~ /^(\w+)\[?(\d*)/) {
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my ($fmt, $cnt) = ($1, $2);
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$cnt = $fmt eq 'string' ? $size : 1 unless $cnt;
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$val = ReadValue(\$buff, 0, $fmt, $cnt, $size);
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}
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# handle other format types
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} elsif ($type eq 'tiledesc') {
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if ($size >= 9) {
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my $x = Get32u(\$buff, 0);
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my $y = Get32u(\$buff, 4);
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my $mode = Get8u(\$buff, 8);
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my $lvl = { 0 => 'One Level', 1 => 'MIMAP Levels', 2 => 'RIPMAP Levels' }->{$mode & 0x0f};
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$lvl or $lvl = 'Unknown Levels (' . ($mode & 0xf) . ')';
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my $rnd = { 0 => 'Round Down', 1 => 'Round Up' }->{$mode >> 4};
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$rnd or $rnd = 'Unknown Rounding (' . ($mode >> 4) . ')';
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$val = "${x}x$y; $lvl; $rnd";
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}
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} elsif ($type eq 'chlist') {
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$val = [ ];
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while ($buff =~ /\G([^\0]{1,31})\0(.{16})/sg) {
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my ($str, $dat) = ($1, $2);
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my ($pix,$lin,$x,$y) = unpack('VCx3VV', $dat);
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$pix = { 0 => 'int8u', 1 => 'half', 2 => 'float' }->{$pix} || "unknown($pix)";
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push @$val, "$str $pix" . ($lin ? ' linear' : '') . " $x $y";
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}
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} elsif ($type eq 'stringvector') {
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$val = [ ];
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my $pos = 0;
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while ($pos + 4 <= length($buff)) {
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my $len = Get32u(\$buff, $pos);
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last if $pos + 4 + $len > length($buff);
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push @$val, substr($buff, $pos + 4, $len);
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$pos += 4 + $len;
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}
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} else {
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$val = \$buff; # (shouldn't happen)
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}
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} else {
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# avoid loading binary data
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$val = \ "Binary data $size bytes";
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$success = $raf->Seek($size, 1);
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}
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unless ($success) {
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$et->Warn('Truncated or corrupted EXR file');
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last;
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}
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$val = '<bad>' unless defined $val;
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# take image dimensions from dataWindow (with displayWindow as backup)
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if (($tag eq 'dataWindow' or (not $dim and $tag eq 'displayWindow')) and
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$val =~ /^(-?\d+) (-?\d+) (-?\d+) (-?\d+)$/)
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{
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$dim = [$3 - $1 + 1, $4 - $2 + 1];
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}
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if ($verbose) {
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my $dataPt = ref $val ? $val : \$val,
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$et->VerboseInfo($tag, $tagInfo,
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Table => $tagTablePtr,
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Value => $val,
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Size => $size,
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Format => $type,
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DataPt => \$buff,
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Addr => $raf->Tell() - $size,
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);
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}
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$et->FoundTag($tagInfo, $val);
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}
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if ($dim) {
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$et->FoundTag('ImageWidth', $$dim[0]);
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$et->FoundTag('ImageHeight', $$dim[1]);
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}
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return 1;
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}
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1; # end
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__END__
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=head1 NAME
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Image::ExifTool::OpenEXR - Read OpenEXR meta information
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=head1 SYNOPSIS
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This module is used by Image::ExifTool
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=head1 DESCRIPTION
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This module contains definitions required by Image::ExifTool to extract meta
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information from OpenEXR images.
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=head1 AUTHOR
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Copyright 2003-2018, Phil Harvey (phil at owl.phy.queensu.ca)
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This library is free software; you can redistribute it and/or modify it
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under the same terms as Perl itself.
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=head1 REFERENCES
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=over 4
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=item L<http://www.openexr.com/documentation.html>
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=back
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=head1 SEE ALSO
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L<Image::ExifTool::TagNames/OpenEXR Tags>,
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L<Image::ExifTool(3pm)|Image::ExifTool>
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=cut
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