| 1 | #------------------------------------------------------------------------------
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| 2 | # File: APP12.pm
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| 3 | #
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| 4 | # Description: Read APP12 meta information
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| 5 | #
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| 6 | # Revisions: 10/18/2005 - P. Harvey Created
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| 7 | #
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| 8 | # References: 1) Heinrich Giesen private communication
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| 9 | #------------------------------------------------------------------------------
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| 10 |
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| 11 | package Image::ExifTool::APP12;
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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);
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| 16 |
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| 17 | $VERSION = '1.06';
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| 18 |
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| 19 | sub ProcessAPP12($$$);
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| 20 | sub ProcessDucky($$$);
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| 21 | sub WriteDucky($$$);
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| 22 |
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| 23 | # APP12 tags (ref PH)
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| 24 | %Image::ExifTool::APP12::PictureInfo = (
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| 25 | PROCESS_PROC => \&ProcessAPP12,
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| 26 | GROUPS => { 0 => 'APP12', 1 => 'PictureInfo', 2 => 'Image' },
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| 27 | NOTES => q{
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| 28 | The JPEG APP12 "Picture Info" segment was used by some older cameras, and
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| 29 | contains ASCII-based meta information. Below are some tags which have been
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| 30 | observed Agfa and Polaroid images, however ExifTool will extract information
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| 31 | from any tags found in this segment.
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| 32 | },
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| 33 | FNumber => {
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| 34 | ValueConv => '$val=~s/^[A-Za-z ]*//;$val', # Agfa leads with an 'F'
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| 35 | PrintConv => 'sprintf("%.1f",$val)',
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| 36 | },
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| 37 | Aperture => {
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| 38 | PrintConv => 'sprintf("%.1f",$val)',
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| 39 | },
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| 40 | TimeDate => {
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| 41 | Name => 'DateTimeOriginal',
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| 42 | Description => 'Date/Time Original',
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| 43 | Groups => { 2 => 'Time' },
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| 44 | ValueConv => '$val=~/^\d+$/ ? ConvertUnixTime($val) : $val',
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| 45 | PrintConv => '$self->ConvertDateTime($val)',
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| 46 | },
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| 47 | Shutter => {
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| 48 | Name => 'ExposureTime',
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| 49 | ValueConv => '$val * 1e-6',
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| 50 | PrintConv => 'Image::ExifTool::Exif::PrintExposureTime($val)',
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| 51 | },
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| 52 | shtr => {
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| 53 | Name => 'ExposureTime',
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| 54 | ValueConv => '$val * 1e-6',
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| 55 | PrintConv => 'Image::ExifTool::Exif::PrintExposureTime($val)',
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| 56 | },
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| 57 | 'Serial#' => {
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| 58 | Name => 'SerialNumber',
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| 59 | Groups => { 2 => 'Camera' },
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| 60 | },
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| 61 | Flash => { PrintConv => { 0 => 'Off', 1 => 'On' } },
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| 62 | Macro => { PrintConv => { 0 => 'Off', 1 => 'On' } },
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| 63 | StrobeTime => { },
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| 64 | Ytarget => { Name => 'YTarget' },
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| 65 | ylevel => { Name => 'YLevel' },
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| 66 | FocusPos => { },
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| 67 | FocusMode => { },
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| 68 | Quality => { },
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| 69 | ExpBias => 'ExposureCompensation',
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| 70 | FWare => 'FirmwareVersion',
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| 71 | StrobeTime => { },
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| 72 | Resolution => { },
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| 73 | Protect => { },
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| 74 | ConTake => { },
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| 75 | ImageSize => { PrintConv => '$val=~tr/-/x/;$val' },
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| 76 | ColorMode => { },
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| 77 | Zoom => { },
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| 78 | ZoomPos => { },
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| 79 | LightS => { },
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| 80 | Type => {
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| 81 | Name => 'CameraType',
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| 82 | Groups => { 2 => 'Camera' },
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| 83 | DataMember => 'CameraType',
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| 84 | RawConv => '$self->{CameraType} = $val',
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| 85 | },
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| 86 | Version => { Groups => { 2 => 'Camera' } },
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| 87 | ID => { Groups => { 2 => 'Camera' } },
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| 88 | );
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| 89 |
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| 90 | # APP12 segment written in Photoshop "Save For Web" images
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| 91 | # (from tests with Photoshop 7 files - PH/1)
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| 92 | %Image::ExifTool::APP12::Ducky = (
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| 93 | PROCESS_PROC => \&ProcessDucky,
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| 94 | WRITE_PROC => \&WriteDucky,
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| 95 | GROUPS => { 0 => 'Ducky', 1 => 'Ducky', 2 => 'Image' },
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| 96 | WRITABLE => 'string',
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| 97 | NOTES => q{
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| 98 | Photoshop uses the JPEG APP12 "Ducky" segment to store some information in
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| 99 | "Save for Web" images.
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| 100 | },
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| 101 | 1 => { #PH
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| 102 | Name => 'Quality',
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| 103 | Priority => 0,
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| 104 | Avoid => 1,
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| 105 | Writable => 'int32u',
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| 106 | ValueConv => 'unpack("N",$val)', # 4-byte integer
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| 107 | ValueConvInv => 'pack("N",$val)',
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| 108 | PrintConv => '"$val%"',
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| 109 | PrintConvInv => '$val=~/(\d+)/ ? $1 : undef',
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| 110 | },
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| 111 | 2 => { #1
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| 112 | Name => 'Comment',
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| 113 | Priority => 0,
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| 114 | Avoid => 1,
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| 115 | # (ignore 4-byte character count at start of value)
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| 116 | ValueConv => '$self->Unicode2Charset(substr($val,4),"MM")',
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| 117 | ValueConvInv => 'pack("N",length $val) . $self->Charset2Unicode($val,"MM")',
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| 118 | },
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| 119 | 3 => { #PH
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| 120 | Name => 'Copyright',
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| 121 | Priority => 0,
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| 122 | Avoid => 1,
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| 123 | Groups => { 2 => 'Author' },
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| 124 | # (ignore 4-byte character count at start of value)
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| 125 | ValueConv => '$self->Unicode2Charset(substr($val,4),"MM")',
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| 126 | ValueConvInv => 'pack("N",length $val) . $self->Charset2Unicode($val,"MM")',
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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 | # Write APP12 Ducky segment
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| 132 | # Inputs: 0) ExifTool object ref, 1) dirInfo ref, 2) tag table ref
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| 133 | # Returns: New directory data or undefined on error
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| 134 | sub WriteDucky($$$)
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| 135 | {
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| 136 | my ($exifTool, $dirInfo, $tagTablePtr) = @_;
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| 137 | $exifTool or return 1; # allow dummy access to autoload this package
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| 138 | my $dataPt = $$dirInfo{DataPt};
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| 139 | my $pos = $$dirInfo{DirStart};
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| 140 | my $newTags = $exifTool->GetNewTagInfoHash($tagTablePtr);
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| 141 | my @addTags = sort { $a <=> $b } keys(%$newTags);
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| 142 | my $verbose = $exifTool->Options('Verbose');
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| 143 | my $out = $exifTool->Options('TextOut');
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| 144 | my ($dirEnd, %doneTags);
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| 145 | if ($dataPt) {
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| 146 | $dirEnd = $pos + $$dirInfo{DirLen};
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| 147 | } else {
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| 148 | my $tmp = '';
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| 149 | $dataPt = \$tmp;
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| 150 | $pos = $dirEnd = 0;
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| 151 | }
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| 152 | my $newData = '';
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| 153 | SetByteOrder('MM');
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| 154 | # process all data blocks in Ducky segment
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| 155 | for (;;) {
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| 156 | my ($tag, $len, $val);
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| 157 | if ($pos + 4 <= $dirEnd) {
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| 158 | $tag = Get16u($dataPt, $pos);
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| 159 | $len = Get16u($dataPt, $pos + 2);
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| 160 | $pos += 4;
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| 161 | if ($pos + $len > $dirEnd) {
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| 162 | $exifTool->Warn('Invalid Ducky block length');
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| 163 | return undef;
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| 164 | }
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| 165 | $val = substr($$dataPt, $pos, $len);
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| 166 | $pos += $len;
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| 167 | } else {
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| 168 | last unless @addTags;
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| 169 | $tag = pop @addTags;
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| 170 | next if $doneTags{$tag};
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| 171 | }
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| 172 | $doneTags{$tag} = 1;
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| 173 | my $tagInfo = $$newTags{$tag};
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| 174 | if ($tagInfo) {
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| 175 | my $newValueHash = $exifTool->GetNewValueHash($tagInfo);
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| 176 | my $isNew;
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| 177 | if (defined $val) {
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| 178 | if (Image::ExifTool::IsOverwriting($newValueHash, $val)) {
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| 179 | if ($verbose > 1) {
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| 180 | my $pval = $exifTool->Printable($val);
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| 181 | print $out " - Ducky:$$tagInfo{Name} = '$pval'\n";
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| 182 | }
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| 183 | $isNew = 1;
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| 184 | }
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| 185 | } else {
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| 186 | next unless Image::ExifTool::IsCreating($newValueHash);
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| 187 | $isNew = 1;
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| 188 | }
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| 189 | if ($isNew) {
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| 190 | $val = Image::ExifTool::GetNewValues($newValueHash);
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| 191 | ++$exifTool->{CHANGED};
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| 192 | next unless defined $val; # next if tag is being deleted
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| 193 | if ($verbose > 1) {
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| 194 | my $pval = $exifTool->Printable($val);
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| 195 | print $out " + Ducky:$$tagInfo{Name} = '$pval'\n";
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| 196 | }
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| 197 | }
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| 198 | }
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| 199 | $newData .= pack('nn', $tag, length $val) . $val;
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| 200 | }
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| 201 | $newData .= "\0\0" if length $newData;
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| 202 | return $newData;
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| 203 | }
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| 204 |
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| 205 | #------------------------------------------------------------------------------
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| 206 | # Process APP12 Ducky segment (ref PH)
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| 207 | # Inputs: 0) ExifTool object reference, 1) Directory information ref, 2) tag table ref
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| 208 | # Returns: 1 on success, 0 if this wasn't a recognized Ducky segment
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| 209 | # Notes: This segment has the following format:
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| 210 | # 1) 5 bytes: "Ducky"
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| 211 | # 2) multiple data blocks (all integers are big endian):
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| 212 | # a) 2 bytes: block type (0=end, 1=Quality, 2=Comment, 3=Copyright)
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| 213 | # b) 2 bytes: block length (N)
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| 214 | # c) N bytes: block data
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| 215 | sub ProcessDucky($$$)
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| 216 | {
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| 217 | my ($exifTool, $dirInfo, $tagTablePtr) = @_;
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| 218 | my $dataPt = $$dirInfo{DataPt};
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| 219 | my $pos = $$dirInfo{DirStart};
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| 220 | my $dirEnd = $pos + $$dirInfo{DirLen};
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| 221 | SetByteOrder('MM');
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| 222 | # process all data blocks in Ducky segment
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| 223 | for (;;) {
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| 224 | last if $pos + 4 > $dirEnd;
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| 225 | my $tag = Get16u($dataPt, $pos);
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| 226 | my $len = Get16u($dataPt, $pos + 2);
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| 227 | $pos += 4;
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| 228 | if ($pos + $len > $dirEnd) {
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| 229 | $exifTool->Warn('Invalid Ducky block length');
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| 230 | last;
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| 231 | }
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| 232 | my $val = substr($$dataPt, $pos, $len);
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| 233 | $exifTool->HandleTag($tagTablePtr, $tag, $val,
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| 234 | DataPt => $dataPt,
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| 235 | DataPos => $$dirInfo{DataPos},
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| 236 | Start => $pos,
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| 237 | Size => $len,
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| 238 | );
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| 239 | $pos += $len;
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| 240 | }
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| 241 | return 1;
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| 242 | }
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| 243 |
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| 244 | #------------------------------------------------------------------------------
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| 245 | # Process APP12 Picture Info segment (ref PH)
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| 246 | # Inputs: 0) ExifTool object reference, 1) Directory information ref, 2) tag table ref
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| 247 | # Returns: 1 on success, 0 if this wasn't a recognized APP12
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| 248 | sub ProcessAPP12($$$)
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| 249 | {
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| 250 | my ($exifTool, $dirInfo, $tagTablePtr) = @_;
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| 251 | my $dataPt = $$dirInfo{DataPt};
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| 252 | my $dirStart = $$dirInfo{DirStart} || 0;
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| 253 | my $dirLen = $$dirInfo{DirLen} || (length($$dataPt) - $dirStart);
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| 254 | if ($dirLen != $dirStart + length($$dataPt)) {
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| 255 | my $buff = substr($$dataPt, $dirStart, $dirLen);
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| 256 | $dataPt = \$buff;
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| 257 | } else {
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| 258 | pos($$dataPt) = $$dirInfo{DirStart};
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| 259 | }
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| 260 | my $verbose = $exifTool->Options('Verbose');
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| 261 | my $success = 0;
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| 262 | my $section = '';
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| 263 | pos($$dataPt) = 0;
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| 264 |
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| 265 | # this regular expression is a bit complex, but basically we are looking for
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| 266 | # section headers (ie. "[Camera Info]") and tag/value pairs (ie. "tag=value",
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| 267 | # where "value" may contain white space), separated by spaces or CR/LF.
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| 268 | # (APP12 uses CR/LF, but Olympus TextualInfo is similar and uses spaces)
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| 269 | while ($$dataPt =~ /(\[.*?\]|[\w#-]+=[\x20-\x7e]+?(?=\s*([\n\r\0]|[\w#-]+=|\[|$)))/g) {
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| 270 | my $token = $1;
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| 271 | # was this a section name?
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| 272 | if ($token =~ /^\[(.*)\]/) {
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| 273 | $exifTool->VerboseDir($1) if $verbose;
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| 274 | $section = ($token =~ /\[(\S+) ?Info\]/i) ? $1 : '';
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| 275 | $success = 1;
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| 276 | next;
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| 277 | }
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| 278 | $exifTool->VerboseDir($$dirInfo{DirName}) if $verbose and not $success;
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| 279 | $success = 1;
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| 280 | my ($tag, $val) = ($token =~ /(\S+)=(.+)/);
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| 281 | my $tagInfo = $exifTool->GetTagInfo($tagTablePtr, $tag);
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| 282 | $verbose and $exifTool->VerboseInfo($tag, $tagInfo, Value => $val);
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| 283 | unless ($tagInfo) {
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| 284 | # add new tag to table
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| 285 | $tagInfo = { Name => $tag };
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| 286 | # put in Camera group if information in "Camera" section
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| 287 | $$tagInfo{Groups} = { 2 => 'Camera' } if $section =~ /camera/i;
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| 288 | Image::ExifTool::AddTagToTable($tagTablePtr, $tag, $tagInfo);
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| 289 | }
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| 290 | $exifTool->FoundTag($tagInfo, $val);
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| 291 | }
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| 292 | return $success;
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| 293 | }
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| 294 |
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| 295 |
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| 296 | 1; #end
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| 297 |
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| 298 | __END__
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| 299 |
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| 300 | =head1 NAME
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| 301 |
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| 302 | Image::ExifTool::APP12 - Read APP12 meta information
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| 303 |
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| 304 | =head1 SYNOPSIS
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| 305 |
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| 306 | This module is loaded automatically by Image::ExifTool when required.
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| 307 |
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| 308 | =head1 DESCRIPTION
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| 309 |
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| 310 | This module contains definitions required by Image::ExifTool to interpret
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| 311 | APP12 meta information.
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| 312 |
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| 313 | =head1 AUTHOR
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| 314 |
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| 315 | Copyright 2003-2007, Phil Harvey (phil at owl.phy.queensu.ca)
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| 316 |
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| 317 | This library is free software; you can redistribute it and/or modify it
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| 318 | under the same terms as Perl itself.
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| 319 |
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| 320 | =head1 ACKNOWLEDGEMENTS
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| 321 |
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| 322 | Thanks to Heinrich Giesen for his help decoding APP12 "Ducky" information.
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| 323 |
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| 324 | =head1 SEE ALSO
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| 325 |
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| 326 | L<Image::ExifTool::TagNames/APP12 Tags>,
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| 327 | L<Image::ExifTool(3pm)|Image::ExifTool>
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| 328 |
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| 329 | =cut
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