214 lines
7.5 KiB
Perl
214 lines
7.5 KiB
Perl
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#------------------------------------------------------------------------------
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# File: Lytro.pm
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#
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# Description: Read Lytro LFP files
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#
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# Revisions: 2014-07-17 - P. Harvey Created
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#
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# References: 1) http://optics.miloush.net/lytro/TheFileFormat.aspx
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#------------------------------------------------------------------------------
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package Image::ExifTool::Lytro;
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use strict;
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use vars qw($VERSION);
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use Image::ExifTool qw(:DataAccess :Utils);
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use Image::ExifTool::Import;
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$VERSION = '1.03';
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sub ExtractTags($$$);
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# Lytro LFP tags (ref PH)
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%Image::ExifTool::Lytro::Main = (
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GROUPS => { 2 => 'Camera' },
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VARS => { NO_ID => 1 },
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NOTES => q{
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Tag definitions for Lytro Light Field Picture (LFP) files. ExifTool
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extracts the full JSON metadata blocks, as well as breaking them down into
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individual tags. All available tags are extracted from the JSON metadata,
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even if they don't appear in the table below.
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},
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JSONMetadata => {
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Notes => 'the full JSON-format metadata blocks',
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Binary => 1,
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List => 1,
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},
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EmbeddedImage => {
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Notes => 'JPEG image embedded in LFP files written by Lytro Desktop',
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Groups => { 2 => 'Preview' },
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Binary => 1,
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},
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Type => { Name => 'CameraType' },
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CameraMake => { Name => 'Make' },
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CameraModel => { Name => 'Model', Description => 'Camera Model Name' },
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CameraSerialNumber => { Name => 'SerialNumber'},
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CameraFirmware => { Name => 'FirmwareVersion'},
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DevicesAccelerometerSampleArrayTime => { Name => 'AccelerometerTime'},
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DevicesAccelerometerSampleArrayX => { Name => 'AccelerometerX'},
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DevicesAccelerometerSampleArrayY => { Name => 'AccelerometerY'},
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DevicesAccelerometerSampleArrayZ => { Name => 'AccelerometerZ'},
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DevicesClockZuluTime => {
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Name => 'DateTimeOriginal',
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Groups => { 2 => 'Time' },
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ValueConv => 'require Image::ExifTool::XMP; Image::ExifTool::XMP::ConvertXMPDate($val)',
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PrintConv => '$self->ConvertDateTime($val)',
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},
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DevicesLensFNumber => {
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Name => 'FNumber',
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PrintConv => 'Image::ExifTool::Exif::PrintFNumber($val)',
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},
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DevicesLensFocalLength => {
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Name => 'FocalLength',
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ValueConv => '$val * 1000', # convert from metres to mm
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PrintConv => 'sprintf("%.1f mm",$val)',
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},
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DevicesLensTemperature => {
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Name => 'LensTemperature',
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PrintConv => 'sprintf("%.1f C",$val)',
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},
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DevicesSocTemperature => {
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Name => 'SocTemperature',
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PrintConv => 'sprintf("%.1f C",$val)',
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},
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DevicesShutterFrameExposureDuration => {
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Name => 'FrameExposureTime',
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PrintConv => 'Image::ExifTool::Exif::PrintExposureTime($val)',
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},
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DevicesShutterPixelExposureDuration => {
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Name => 'ExposureTime',
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PrintConv => 'Image::ExifTool::Exif::PrintExposureTime($val)',
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},
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DevicesSensorPixelPitch => {
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Name => 'FocalPlaneXResolution',
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Notes => 'Y resolution is the same as X resolution',
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ValueConv => '25.4 / $val / 1000', # convert from metres to pixels/inch
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},
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DevicesSensorSensorSerial => { Name => 'SensorSerialNumber'},
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DevicesSensorIso => { Name => 'ISO' },
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ImageLimitExposureBias => { Groups => { 2 => 'Image' }, PrintConv => 'sprintf("%+.1f", $val)' },
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ImageModulationExposureBias => { Groups => { 2 => 'Image' }, PrintConv => 'sprintf("%+.1f", $val)' },
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ImageOrientation => {
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Name => 'Orientation',
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Groups => { 2 => 'Image' },
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PrintConv => {
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1 => 'Horizontal (normal)',
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},
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},
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);
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#------------------------------------------------------------------------------
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# Extract tags from a parsed JSON hash
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# Inputs: 0) ExifTool ref, 1) tag hash ref, 2) base tag name
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sub ExtractTags($$$)
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{
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my ($et, $meta, $parent) = @_;
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ref $meta eq 'HASH' or $et->Warn('Invalid LFP metadata'), return;
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my ($key, $val, $name, $tagTablePtr);
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foreach $key (sort keys %$meta) {
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my $tag = $parent . ucfirst($key);
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foreach $val (ref $$meta{$key} eq 'ARRAY' ? @{$$meta{$key}} : $$meta{$key}) {
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ref $val eq 'HASH' and ExtractTags($et, $val, $tag), next;
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$tagTablePtr or $tagTablePtr = GetTagTable('Image::ExifTool::Lytro::Main');
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unless ($$tagTablePtr{$tag}) {
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($name = $tag) =~ s/[^-_a-zA-Z0-9](.?)/\U$1/g;
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$name =~ s/ParametersVendorContentComLytroTags//;
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my %tagInfo;
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$tagInfo{Groups} = { 2 => 'Image' } unless $name =~ s/^Devices//;
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$tagInfo{List} = 1 if ref $$meta{$key} eq 'ARRAY';
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$tagInfo{Name} = $name;
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my $str = $tag eq $name ? '' : " as $name";
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$et->VPrint(0, " [adding $tag$str]\n");
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AddTagToTable($tagTablePtr, $tag, \%tagInfo);
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}
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$et->HandleTag($tagTablePtr, $tag, $val);
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}
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}
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}
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#------------------------------------------------------------------------------
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# Process segments from a Lytro LFP image
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# Inputs: 0) ExifTool object reference, 1) dirInfo reference
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# Returns: 1 on success, 0 if this wasn't a valid Lytro image
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sub ProcessLFP($$)
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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 = $et->Options('Verbose');
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my ($buff, $id);
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# validate the Lytro file header
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return 0 unless $raf->Read($buff, 16) == 16 and $buff =~ /^\x89LFP\x0d\x0a\x1a\x0a/;
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$et->SetFileType(); # set the FileType tag
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SetByteOrder('MM');
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my $tagTablePtr = GetTagTable('Image::ExifTool::Lytro::Main');
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while ($raf->Read($buff, 16) == 16) {
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$buff =~ /^\x89LF/ or $et->Warn('LFP format error'), last;
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my $size = Get32u(\$buff, 12);
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$size & 0x80000000 and $et->Warn('Invalid LFP segment size'), last;
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$raf->Read($id, 80) == 80 or $et->Warn('Truncated LFP segment'), last; # ignore the sha1
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if ($verbose) {
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$id =~ s/\0.*//s;
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$et->VPrint(0, substr($buff,1,3), " segment ($size bytes, $id)\n");
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}
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if ($size > 20000000) {
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$raf->Seek($size, 1) or $et->Warn('Seek error in LFP file'), last;
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} else {
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$raf->Read($buff,$size) == $size or $et->Warn('Truncated LFP data'), last;
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$et->VerboseDump(\$buff, Addr=>$raf->Tell()-$size);
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if ($buff =~ /^\{\s+"/) { # JSON metadata?
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pos($buff) = 0;
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$et->HandleTag($tagTablePtr, 'JSONMetadata', $buff);
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my $meta = Image::ExifTool::Import::ReadJSONObject(undef, \$buff);
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ExtractTags($et, $meta, '');
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} elsif ($buff =~ /^\xff\xd8\xff/) { # embedded JPEG image?
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$et->HandleTag($tagTablePtr, 'EmbeddedImage', $buff);
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}
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}
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# skip padding if necessary
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my $pad = 16 - ($size % 16);
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$raf->Seek($pad, 1) if $pad != 16;
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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::Lytro - Read Lytro LFP files
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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 routines required by Image::ExifTool to read metadata
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from Lytro Light Field Picture (LFP) files.
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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://optics.miloush.net/lytro/TheFileFormat.aspx>
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=back
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=head1 SEE ALSO
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L<Image::ExifTool::TagNames/Lytro Tags>,
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L<Image::ExifTool(3pm)|Image::ExifTool>
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=cut
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