142 lines
3.9 KiB
Perl
Executable File
142 lines
3.9 KiB
Perl
Executable File
#------------------------------------------------------------------------------
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# File: Scalado.pm
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#
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# Description: Read APP4 SCALADO metadata
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#
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# Revisions: 2013-09-13 - P. Harvey Created
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#------------------------------------------------------------------------------
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package Image::ExifTool::Scalado;
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use strict;
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use vars qw($VERSION);
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use Image::ExifTool qw(:DataAccess :Utils);
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use Image::ExifTool::PLIST;
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$VERSION = '1.01';
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sub ProcessScalado($$$);
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# JPEG APP4 SCALADO tags
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%Image::ExifTool::Scalado::Main = (
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GROUPS => { 0 => 'APP4', 1 => 'Scalado', 2 => 'Image' },
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PROCESS_PROC => \&ProcessScalado,
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TAG_PREFIX => 'Scalado',
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FORMAT => 'int32s',
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NOTES => q{
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Tags extracted from the JPEG APP4 "SCALADO" segment found in images from
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HTC, LG and Samsung phones. (Presumably written by Scalado mobile software,
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L<http://www.scalado.com/>.)
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},
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SPMO => {
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Name => 'DataLength',
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Unknown => 1,
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},
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WDTH => {
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Name => 'PreviewImageWidth',
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ValueConv => '$val ? abs($val) : undef',
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},
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HGHT => {
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Name => 'PreviewImageHeight',
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ValueConv => '$val ? abs($val) : undef',
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},
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QUAL => {
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Name => 'PreviewQuality',
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ValueConv => '$val ? abs($val) : undef',
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},
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# tags not yet decoded with observed values:
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# CHKH: 0, various negative values
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# CHKL: various negative values
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# CLEN: -1024
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# CSPC: -2232593
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# DATA: (+ve data length)
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# HDEC: 0
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# MAIN: 0, 60
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# META: 24
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# SCI0: (+ve data length) often 36
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# SCI1: (+ve data length) 36
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# SCX0: (+ve data length)
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# SCX1: (+ve data length) often 84
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# WDEC: 0
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# VERS: -131328
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);
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#------------------------------------------------------------------------------
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# Extract information from the JPEG APP4 SCALADO segment
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# Inputs: 0) ExifTool object ref, 1) dirInfo ref, 2) tag table ref
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# Returns: 1 on success
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sub ProcessScalado($$$)
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{
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my ($et, $dirInfo, $tagTablePtr) = @_;
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my $dataPt = $$dirInfo{DataPt};
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my $pos = 0;
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my $end = length $$dataPt;
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my $unknown = $et->Options('Unknown');
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$et->VerboseDir('APP4 SCALADO', undef, $end);
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SetByteOrder('MM');
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for (;;) {
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last if $pos + 12 > $end;
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my $tag = substr($$dataPt, $pos, 4);
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my $ver = Get32u($dataPt, $pos + 4); # (looks like a version for some tags)
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if (not $$tagTablePtr{$tag} and $unknown) {
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my $name = $tag;
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$name =~ tr/-A-Za-z0-9_//dc;
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last unless length $name; # stop if tag is garbage
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AddTagToTable($tagTablePtr, $tag, {
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Name => "Scalado_$name",
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Description => "Scalado $name",
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Unknown => 1,
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});
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}
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$et->HandleTag($tagTablePtr, $tag, undef,
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DataPt => $dataPt,
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Start => $pos + 8,
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Size => 4,
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Extra => ", ver $ver",
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);
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if ($tag eq 'SPMO') {
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my $val = Get32u($dataPt, $pos + 8) ;
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if ($ver < 5) { # (I don't have samples for version 3 or 4, so I'm not sure about these)
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$end -= $val; # SPMO gives trailer data length
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} else {
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$end = $val + 12; # SPMO gives length of Scalado directory (excepting this entry)
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}
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}
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$pos += 12;
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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::Scalado - Read APP4 SCALADO metadata
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=head1 SYNOPSIS
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This module is loaded automatically by Image::ExifTool when required.
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=head1 DESCRIPTION
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This module contains definitions required by Image::ExifTool to read
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metadata from the JPEG APP4 SCALADO segment.
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=head1 AUTHOR
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Copyright 2003-2016, 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 SEE ALSO
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L<Image::ExifTool::TagNames/Scalado Tags>,
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L<Image::ExifTool(3pm)|Image::ExifTool>
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=cut
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