File Coverage

blib/lib/Image/ExifTool/Lytro.pm

Criterion	Covered	Total	%
statement	57	61	93.4
branch	24	38	63.1
condition	1	3	33.3
subroutine	6	6	100.0
pod	0	2	0.0
total	88	110	80.0

#------------------------------------------------------------------------------
# File:         Lytro.pm
#
# Description:  Read Lytro LFP files
#
# Revisions:    2014-07-17 - P. Harvey Created
#
# References:   1) http://optics.miloush.net/lytro/TheFileFormat.aspx
#------------------------------------------------------------------------------

package Image::ExifTool::Lytro;

use strict;
use vars qw($VERSION);
use Image::ExifTool qw(:DataAccess :Utils);
use Image::ExifTool::Import;

$VERSION = '1.03';

sub ExtractTags($$$);

# Lytro LFP tags (ref PH)
%Image::ExifTool::Lytro::Main = (
    GROUPS => { 2 => 'Camera' },
    VARS => { NO_ID => 1 },
    NOTES => q{
        Tag definitions for Lytro Light Field Picture (LFP) files.  ExifTool
        extracts the full JSON metadata blocks, as well as breaking them down into
        individual tags.  All available tags are extracted from the JSON metadata,
        even if they don't appear in the table below.
    },
    JSONMetadata => {
        Notes => 'the full JSON-format metadata blocks',
        Binary => 1,
        List => 1,
    },
    EmbeddedImage => {
        Notes => 'JPEG image embedded in LFP files written by Lytro Desktop',
        Groups => { 2 => 'Preview' },
        Binary => 1,
    },
    Type                => { Name => 'CameraType' },
    CameraMake          => { Name => 'Make' },
    CameraModel         => { Name => 'Model', Description => 'Camera Model Name' },
    CameraSerialNumber  => { Name => 'SerialNumber'},
    CameraFirmware      => { Name => 'FirmwareVersion'},
    DevicesAccelerometerSampleArrayTime => { Name => 'AccelerometerTime'},
    DevicesAccelerometerSampleArrayX    => { Name => 'AccelerometerX'},
    DevicesAccelerometerSampleArrayY    => { Name => 'AccelerometerY'},
    DevicesAccelerometerSampleArrayZ    => { Name => 'AccelerometerZ'},
    DevicesClockZuluTime => {
        Name => 'DateTimeOriginal',
        Description => 'Date/Time Original',
        Groups => { 2 => 'Time' },
        ValueConv => 'require Image::ExifTool::XMP; Image::ExifTool::XMP::ConvertXMPDate($val)',
        PrintConv => '$self->ConvertDateTime($val)',
    },
    DevicesLensFNumber => {
        Name => 'FNumber',
        PrintConv => 'Image::ExifTool::Exif::PrintFNumber($val)',
    },
    DevicesLensFocalLength => {
        Name => 'FocalLength',
        ValueConv => '$val * 1000', # convert from metres to mm
        PrintConv => 'sprintf("%.1f mm",$val)',
    },
    DevicesLensTemperature => {
        Name => 'LensTemperature',
        PrintConv => 'sprintf("%.1f C",$val)',
    },
    DevicesSocTemperature => {
        Name => 'SocTemperature',
        PrintConv => 'sprintf("%.1f C",$val)',
    },
    DevicesShutterFrameExposureDuration => {
        Name => 'FrameExposureTime',
        PrintConv => 'Image::ExifTool::Exif::PrintExposureTime($val)',
    },
    DevicesShutterPixelExposureDuration => {
        Name => 'ExposureTime',
        PrintConv => 'Image::ExifTool::Exif::PrintExposureTime($val)',
    },
    DevicesSensorPixelPitch => {
        Name => 'FocalPlaneXResolution',
        Notes => 'Y resolution is the same as X resolution',
        ValueConv => '25.4 / $val / 1000',  # convert from metres to pixels/inch
    },
    DevicesSensorSensorSerial   => { Name => 'SensorSerialNumber'},
    DevicesSensorIso            => { Name => 'ISO' },
    ImageLimitExposureBias      => { Groups => { 2 => 'Image' }, PrintConv => 'sprintf("%+.1f", $val)' },
    ImageModulationExposureBias => { Groups => { 2 => 'Image' }, PrintConv => 'sprintf("%+.1f", $val)' },
    ImageOrientation => {
        Name => 'Orientation',
        Groups => { 2 => 'Image' },
        PrintConv => {
            1 => 'Horizontal (normal)',
        },
    },
);

#------------------------------------------------------------------------------
# Extract tags from a parsed JSON hash
# Inputs: 0) ExifTool ref, 1) tag hash ref, 2) base tag name
sub ExtractTags($$$)
{
    my ($et, $meta, $parent) = @_;
    ref $meta eq 'HASH' or $et->Warn('Invalid LFP metadata'), return;
    my ($key, $val, $name, $tagTablePtr);
    foreach $key (sort keys %$meta) {
        my $tag = $parent . ucfirst($key);
        foreach $val (ref $$meta{$key} eq 'ARRAY' ? @{$$meta{$key}} : $$meta{$key}) {
            ref $val eq 'HASH' and ExtractTags($et, $val, $tag), next;
            $tagTablePtr or $tagTablePtr = GetTagTable('Image::ExifTool::Lytro::Main');
            unless ($$tagTablePtr{$tag}) {
                ($name = $tag) =~ s/[^-_a-zA-Z0-9](.?)/\U$1/g;
                $name =~ s/ParametersVendorContentComLytroTags//;
                my %tagInfo;
                $tagInfo{Groups} = { 2 => 'Image' } unless $name =~ s/^Devices//;
                $tagInfo{List} = 1 if ref $$meta{$key} eq 'ARRAY';
                $tagInfo{Name} = $name;
                my $str = $tag eq $name ? '' : " as $name";
                $et->VPrint(0, "  [adding $tag$str]\n");
                AddTagToTable($tagTablePtr, $tag, \%tagInfo);
            }
            $et->HandleTag($tagTablePtr, $tag, $val);
        }
    }
}

#------------------------------------------------------------------------------
# Process segments from a Lytro LFP image
# Inputs: 0) ExifTool object reference, 1) dirInfo reference
# Returns: 1 on success, 0 if this wasn't a valid Lytro image
sub ProcessLFP($$)
{
    my ($et, $dirInfo) = @_;
    my $raf = $$dirInfo{RAF};
    my $verbose = $et->Options('Verbose');
    my ($buff, $id);

    # validate the Lytro file header
    return 0 unless $raf->Read($buff, 16) == 16 and $buff =~ /^\x89LFP\x0d\x0a\x1a\x0a/;
    $et->SetFileType();   # set the FileType tag
    SetByteOrder('MM');
    my $tagTablePtr = GetTagTable('Image::ExifTool::Lytro::Main');
    while ($raf->Read($buff, 16) == 16) {
        $buff =~ /^\x89LF/ or $et->Warn('LFP format error'), last;
        my $size = Get32u(\$buff, 12);
        $size & 0x80000000 and $et->Warn('Invalid LFP segment size'), last;
        $raf->Read($id, 80) == 80 or $et->Warn('Truncated LFP segment'), last;  # ignore the sha1
        if ($verbose) {
            $id =~ s/\0.*//s;
            $et->VPrint(0, substr($buff,1,3), " segment ($size bytes, $id)\n");
        }
        if ($size > 20000000) {
            $raf->Seek($size, 1) or $et->Warn('Seek error in LFP file'), last;
        } else {
            $raf->Read($buff,$size) == $size or $et->Warn('Truncated LFP data'), last;
            $et->VerboseDump(\$buff, Addr=>$raf->Tell()-$size);
            if ($buff =~ /^\{\s+"/) { # JSON metadata?
                pos($buff) = 0;
                $et->HandleTag($tagTablePtr, 'JSONMetadata', $buff);
                my $meta = Image::ExifTool::Import::ReadJSONObject(undef, \$buff);
                ExtractTags($et, $meta, '');
            } elsif ($buff =~ /^\xff\xd8\xff/) { # embedded JPEG image?
                $et->HandleTag($tagTablePtr, 'EmbeddedImage', $buff);
            }
        }
        # skip padding if necessary
        my $pad = 16 - ($size % 16);
        $raf->Seek($pad, 1) if $pad != 16;
    }
    return 1;
}

1;  # end

__END__