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78 lines
2.5 KiB
Plaintext
78 lines
2.5 KiB
Plaintext
18 years ago
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XMP support
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===========
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Exiv2 uses the Adobe XMP toolkit (XMP SDK) to parse
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and serialize XMP packets (only the XMPCore component).
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Todo: XMP support is controlled with the ENABLE_XMP directive
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in config/config.mk.in. This will be a configure option
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eventually.
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Top-level classes to access XMP metadata are XmpData,
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XmpDatum and XmpKey. They work similar to the corresponding
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Exif and IPTC classes. The property-repository is XmpProperties.
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In addition to the expected new members, class Image also
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has a new interface to access the raw XMP packet.
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Supported XMP types
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-------------------
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Simple types : supported
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Structures : not supported
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Arrays : unordered and ordered arrays are supported
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alternative arrays are not supported
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Property Qualifiers : not supported
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Language Alternatives : not supported
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XMP properties are accessed through keys of the form
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"Xmp.<Prefix>.<Property>", where <Prefix> is the preferred
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(or rather, registered) prefix for a schema namespace and
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<Property> is the name of a property in that namespace. Only
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known properties in known namespaces are supported at the
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moment. Functions to register namespaces and properterties
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are not provided yet.
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Note: Unlike Exif and IPTC tags, XMP properties do not have
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a tag number.
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XMP toolkit installation
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========================
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This is what worked for me on a Debian GNU/Linux (testing)
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system. Your mileage may vary. Please check with Adobe if
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you encounter problems with the XMP toolkit installation.
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Installation directory
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----------------------
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The top-level exiv2 directory ($HOME/src/exiv2/ on my system).
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If you install XMP elsewhere, or use different OS or STAGE
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options to the make command below, you will need to manually
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modify the exiv2/config/config.mk.in (before running the
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configure script). There is no autoconf-magic yet to set
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this via configure options.
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External packages (non-Debian)
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-----------------
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xmp_v411_sdk.zip - from adobe.com: http://www.adobe.com/devnet/xmp/sdk/eula.html
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expat-2.0.1.tar.gz - from sourceforge.net: http://sourceforge.net/project/showfiles.php?group_id=10127
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exiv2 - from SVN
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Installation steps
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------------------
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cd $HOME/src/exiv2/
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cp /path/to/xmp_v411_sdk.zip ./
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unzip xmp_v411_sdk.zip
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cp /path/to/expat-2.0.1.tar.gz XMP-SDK/third-party/
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cd XMP-SDK/third-party/
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tar zxvf expat-2.0.1.tar.gz
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mv expat expat-orig
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mv expat-2.0.1 expat
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cd ../build/gcc
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make -f XMPCore.mak OS=i80386linux STAGE=debug
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Expected result
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---------------
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Now there should be a library
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../../public/libraries/i80386linux/debug/libXMPCoreStaticDebug.a
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