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########################################################### |
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# A Perl package for showing/modifying JPEG (meta)data. # |
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# Copyright (C) 2004,2005,2006 Stefano Bettelli # |
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# See the COPYING and LICENSE files for license terms. # |
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########################################################### |
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use Image::MetaData::JPEG::data::Tables qw(:TagsAPP1_Exif :TagsAPP1_XMP); |
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no integer; |
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use strict; |
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use warnings; |
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########################################################### |
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# This method parses an APP1 segment. Such an application # |
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# segment can host a great deal of metadata, in at least # |
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# two formats (see specialised routines for more details):# |
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# 1) Exif JPEG files use APP1 so that they do not con- # |
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# flict with JFIF metadata (which use APP0); # |
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# 2) Adobe, in order to be more standard compliant than # |
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# others, uses APP1 for its XMP metadata format. # |
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# This method decides among the various formats and then # |
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# calls a more specialised method. An error is issued if # |
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# the metadata format is not recognised. # |
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#=========================================================# |
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# Ref: "Exchangeable image file format for digital still # |
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# cameras: Exif Version 2.2", JEITA CP-3451, Apr2002 # |
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# Japan Electronic Industry Development Assoc. (JEIDA) # |
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# and: "XMP Specification", version 3.2, June 2005, Adobe # |
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# Systems Inc., San Jose, CA, http://www.adobe.com # |
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########################################################### |
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sub parse_app1 { |
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my ($this) = @_; |
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# If the data area begins with "Exif\000\000" it is an Exif section |
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return $this->parse_app1_exif() |
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if $this->data(0, length $APP1_EXIF_TAG) eq $APP1_EXIF_TAG; |
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# If it begins with "http://ns.adobe.com/xap/1.0/", it is Adobe XMP |
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return $this->parse_app1_xmp() |
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if $this->data(0, length $APP1_XMP_TAG) eq $APP1_XMP_TAG; |
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# if the segment type is unknown, generate an error |
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$this->die('Incorrect identifier (' . $this->data(0,6) . ')'); |
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} |
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require 'Image/MetaData/JPEG/parsers/app1_exif.pl'; |
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require 'Image/MetaData/JPEG/parsers/app1_xmp.pl'; |
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# successful load |
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1; |