1 | #------------------------------------------------------------------------------
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2 | # File: Lytro.pm
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3 | #
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4 | # Description: Read Lytro LFP files
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5 | #
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6 | # Revisions: 2014-07-17 - P. Harvey Created
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7 | #
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8 | # References: 1) http://optics.miloush.net/lytro/TheFileFormat.aspx
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9 | #------------------------------------------------------------------------------
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10 |
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11 | package Image::ExifTool::Lytro;
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12 |
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13 | use strict;
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14 | use vars qw($VERSION);
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15 | use Image::ExifTool qw(:DataAccess :Utils);
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16 | use Image::ExifTool::Import;
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17 |
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18 | $VERSION = '1.03';
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19 |
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20 | sub ExtractTags($$$);
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21 |
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22 | # Lytro LFP tags (ref PH)
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23 | %Image::ExifTool::Lytro::Main = (
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24 | GROUPS => { 2 => 'Camera' },
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25 | VARS => { NO_ID => 1 },
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26 | NOTES => q{
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27 | Tag definitions for Lytro Light Field Picture (LFP) files. ExifTool
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28 | extracts the full JSON metadata blocks, as well as breaking them down into
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29 | individual tags. All available tags are extracted from the JSON metadata,
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30 | even if they don't appear in the table below.
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31 | },
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32 | JSONMetadata => {
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33 | Notes => 'the full JSON-format metadata blocks',
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34 | Binary => 1,
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35 | List => 1,
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36 | },
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37 | EmbeddedImage => {
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38 | Notes => 'JPEG image embedded in LFP files written by Lytro Desktop',
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39 | Groups => { 2 => 'Preview' },
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40 | Binary => 1,
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41 | },
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42 | Type => { Name => 'CameraType' },
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43 | CameraMake => { Name => 'Make' },
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44 | CameraModel => { Name => 'Model', Description => 'Camera Model Name' },
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45 | CameraSerialNumber => { Name => 'SerialNumber'},
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46 | CameraFirmware => { Name => 'FirmwareVersion'},
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47 | DevicesAccelerometerSampleArrayTime => { Name => 'AccelerometerTime'},
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48 | DevicesAccelerometerSampleArrayX => { Name => 'AccelerometerX'},
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49 | DevicesAccelerometerSampleArrayY => { Name => 'AccelerometerY'},
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50 | DevicesAccelerometerSampleArrayZ => { Name => 'AccelerometerZ'},
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51 | DevicesClockZuluTime => {
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52 | Name => 'DateTimeOriginal',
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53 | Description => 'Date/Time Original',
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54 | Groups => { 2 => 'Time' },
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55 | ValueConv => 'require Image::ExifTool::XMP; Image::ExifTool::XMP::ConvertXMPDate($val)',
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56 | PrintConv => '$self->ConvertDateTime($val)',
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57 | },
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58 | DevicesLensFNumber => {
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59 | Name => 'FNumber',
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60 | PrintConv => 'Image::ExifTool::Exif::PrintFNumber($val)',
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61 | },
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62 | DevicesLensFocalLength => {
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63 | Name => 'FocalLength',
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64 | ValueConv => '$val * 1000', # convert from metres to mm
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65 | PrintConv => 'sprintf("%.1f mm",$val)',
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66 | },
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67 | DevicesLensTemperature => {
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68 | Name => 'LensTemperature',
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69 | PrintConv => 'sprintf("%.1f C",$val)',
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70 | },
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71 | DevicesSocTemperature => {
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72 | Name => 'SocTemperature',
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73 | PrintConv => 'sprintf("%.1f C",$val)',
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74 | },
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75 | DevicesShutterFrameExposureDuration => {
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76 | Name => 'FrameExposureTime',
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77 | PrintConv => 'Image::ExifTool::Exif::PrintExposureTime($val)',
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78 | },
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79 | DevicesShutterPixelExposureDuration => {
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80 | Name => 'ExposureTime',
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81 | PrintConv => 'Image::ExifTool::Exif::PrintExposureTime($val)',
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82 | },
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83 | DevicesSensorPixelPitch => {
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84 | Name => 'FocalPlaneXResolution',
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85 | Notes => 'Y resolution is the same as X resolution',
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86 | ValueConv => '25.4 / $val / 1000', # convert from metres to pixels/inch
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87 | },
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88 | DevicesSensorSensorSerial => { Name => 'SensorSerialNumber'},
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89 | DevicesSensorIso => { Name => 'ISO' },
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90 | ImageLimitExposureBias => { Groups => { 2 => 'Image' }, PrintConv => 'sprintf("%+.1f", $val)' },
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91 | ImageModulationExposureBias => { Groups => { 2 => 'Image' }, PrintConv => 'sprintf("%+.1f", $val)' },
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92 | ImageOrientation => {
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93 | Name => 'Orientation',
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94 | Groups => { 2 => 'Image' },
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95 | PrintConv => {
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96 | 1 => 'Horizontal (normal)',
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97 | },
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98 | },
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99 | );
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100 |
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101 | #------------------------------------------------------------------------------
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102 | # Extract tags from a parsed JSON hash
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103 | # Inputs: 0) ExifTool ref, 1) tag hash ref, 2) base tag name
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104 | sub ExtractTags($$$)
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105 | {
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106 | my ($et, $meta, $parent) = @_;
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107 | ref $meta eq 'HASH' or $et->Warn('Invalid LFP metadata'), return;
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108 | my ($key, $val, $name, $tagTablePtr);
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109 | foreach $key (sort keys %$meta) {
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110 | my $tag = $parent . ucfirst($key);
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111 | foreach $val (ref $$meta{$key} eq 'ARRAY' ? @{$$meta{$key}} : $$meta{$key}) {
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112 | ref $val eq 'HASH' and ExtractTags($et, $val, $tag), next;
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113 | $tagTablePtr or $tagTablePtr = GetTagTable('Image::ExifTool::Lytro::Main');
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114 | unless ($$tagTablePtr{$tag}) {
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115 | ($name = $tag) =~ s/[^-_a-zA-Z0-9](.?)/\U$1/g;
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116 | $name =~ s/ParametersVendorContentComLytroTags//;
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117 | my %tagInfo;
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118 | $tagInfo{Groups} = { 2 => 'Image' } unless $name =~ s/^Devices//;
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119 | $tagInfo{List} = 1 if ref $$meta{$key} eq 'ARRAY';
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120 | $tagInfo{Name} = $name;
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121 | my $str = $tag eq $name ? '' : " as $name";
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122 | $et->VPrint(0, " [adding $tag$str]\n");
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123 | AddTagToTable($tagTablePtr, $tag, \%tagInfo);
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124 | }
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125 | $et->HandleTag($tagTablePtr, $tag, $val);
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126 | }
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127 | }
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128 | }
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129 |
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130 | #------------------------------------------------------------------------------
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131 | # Process segments from a Lytro LFP image
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132 | # Inputs: 0) ExifTool object reference, 1) dirInfo reference
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133 | # Returns: 1 on success, 0 if this wasn't a valid Lytro image
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134 | sub ProcessLFP($$)
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135 | {
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136 | my ($et, $dirInfo) = @_;
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137 | my $raf = $$dirInfo{RAF};
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138 | my $verbose = $et->Options('Verbose');
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139 | my ($buff, $id);
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140 |
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141 | # validate the Lytro file header
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142 | return 0 unless $raf->Read($buff, 16) == 16 and $buff =~ /^\x89LFP\x0d\x0a\x1a\x0a/;
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143 | $et->SetFileType(); # set the FileType tag
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144 | SetByteOrder('MM');
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145 | my $tagTablePtr = GetTagTable('Image::ExifTool::Lytro::Main');
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146 | while ($raf->Read($buff, 16) == 16) {
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147 | $buff =~ /^\x89LF/ or $et->Warn('LFP format error'), last;
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148 | my $size = Get32u(\$buff, 12);
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149 | $size & 0x80000000 and $et->Warn('Invalid LFP segment size'), last;
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150 | $raf->Read($id, 80) == 80 or $et->Warn('Truncated LFP segment'), last; # ignore the sha1
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151 | if ($verbose) {
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152 | $id =~ s/\0.*//s;
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153 | $et->VPrint(0, substr($buff,1,3), " segment ($size bytes, $id)\n");
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154 | }
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155 | if ($size > 20000000) {
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156 | $raf->Seek($size, 1) or $et->Warn('Seek error in LFP file'), last;
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157 | } else {
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158 | $raf->Read($buff,$size) == $size or $et->Warn('Truncated LFP data'), last;
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159 | $et->VerboseDump(\$buff, Addr=>$raf->Tell()-$size);
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160 | if ($buff =~ /^\{\s+"/) { # JSON metadata?
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161 | pos($buff) = 0;
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162 | $et->HandleTag($tagTablePtr, 'JSONMetadata', $buff);
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163 | my $meta = Image::ExifTool::Import::ReadJSONObject(undef, \$buff);
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164 | ExtractTags($et, $meta, '');
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165 | } elsif ($buff =~ /^\xff\xd8\xff/) { # embedded JPEG image?
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166 | $et->HandleTag($tagTablePtr, 'EmbeddedImage', $buff);
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167 | }
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168 | }
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169 | # skip padding if necessary
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170 | my $pad = 16 - ($size % 16);
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171 | $raf->Seek($pad, 1) if $pad != 16;
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172 | }
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173 | return 1;
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174 | }
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175 |
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176 | 1; # end
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177 |
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178 | __END__
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179 |
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180 | =head1 NAME
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181 |
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182 | Image::ExifTool::Lytro - Read Lytro LFP files
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183 |
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184 | =head1 SYNOPSIS
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185 |
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186 | This module is used by Image::ExifTool
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187 |
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188 | =head1 DESCRIPTION
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189 |
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190 | This module contains routines required by Image::ExifTool to read metadata
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191 | from Lytro Light Field Picture (LFP) files.
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192 |
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193 | =head1 AUTHOR
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194 |
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195 | Copyright 2003-2021, Phil Harvey (philharvey66 at gmail.com)
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196 |
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197 | This library is free software; you can redistribute it and/or modify it
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198 | under the same terms as Perl itself.
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199 |
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200 | =head1 REFERENCES
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201 |
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202 | =over 4
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203 |
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204 | =item L<http://optics.miloush.net/lytro/TheFileFormat.aspx>
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205 |
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206 | =back
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207 |
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208 | =head1 SEE ALSO
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209 |
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210 | L<Image::ExifTool::TagNames/Lytro Tags>,
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211 | L<Image::ExifTool(3pm)|Image::ExifTool>
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212 |
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213 | =cut
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214 |
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