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8efb5d2012
Original commit message from CVS: Map Date-Time and GPS tags and Convert from EXIF to XMP Datatime as local time (those changes has been done in previous comit but had to be revert in 2008-02-10 due to frozen)
59 lines
2.8 KiB
Plaintext
59 lines
2.8 KiB
Plaintext
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This file contains a list of things to be done as well some open issues (questions) related to design/implementation.
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INFO:
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1- To see the list of tags current mapped:
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http://webcvs.freedesktop.org/gstreamer/gst-plugins-bad/ext/metadata/metadata_mapping.htm?view=co
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TODO:
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1- Add more individual tags to XMP, EXIF and IPTC
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2- Get properties like 'width' and 'height' from caps
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3- Review the code (in order to move to gst-plugins-good)
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4- Document how the plugin works (atchitecture and interaction beteween modules)
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5- Improve the test application (to save also in png and to make it possible to set the metadata elements properties)
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6- Implement GDateTime support in GLib to be used by GStreamer (http://bugzilla.gnome.org/show_bug.cgi?id=50076)
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7- Use a standard GStreamer Data-Time type to map our Data-time tags
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8- Make the correct merge mode for multiple value tags (bag and seq) like dc:creator, ...
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OPEN ISSUES:
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1- What is (How) the best way to delete some tag?
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2- How to change metadata when the orignal image was modified.
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ex: file.jpeg has XMP, then we do filesrc ! metadataparse ! jpegdec ! pngenc ! metadatamux ! files
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is the metadata still valid? which fields are no valid anymore?
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3- In EXIF, how to make sure we are compliant with the specification when adding some tag? For example, we are not considerinb what are mandatory (or optional) IFDs for tags.
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4- Add GST_TYPE_FRACTION support for GStreamer TAGS
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5- currently, in JPEG files, if there is a Photoshop segment, everything inside it but IPTC will be lost. From the point of view of implementation it is easy, but I still don't now how to solve from the point of view of "designing". Anyway I think it is not so important.
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6- language is not considered in XMP (How to do it with GStreamer?)
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7- Add a helper function that convert from value to string. For example,
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aperture-size is 2.7 and the app wants to show "f/2.7", 'contrast' is a range
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and the app wants to show as "Normal", "Soft", "Hard". For the time being it is
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up to the APP to make this conversion.
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LINKS IN BUGZILA
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1- to move to good
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http://bugzilla.gnome.org/show_bug.cgi?id=513182
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2- Proposal of new tags
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http://bugzilla.gnome.org/show_bug.cgi?id=482947
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http://bugzilla.gnome.org/show_bug.cgi?id=481169
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3- Discussion about the architecture
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http://bugzilla.gnome.org/show_bug.cgi?id=486659
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4- Also extraction image width and height and set caps properly
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http://bugzilla.gnome.org/show_bug.cgi?id=503616
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KNOWN BUGS
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bugs in libexif:
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1- https://sourceforge.net/tracker/?func=detail&atid=112272&aid=1884609&group_id=12272
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a- EXIF_TAG_ISO_SPEED_RATINGS should be in EXIF_IFD_EXIF
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b- EXIF_TAG_ISO_SPEED_RATINGS is not inserted anyway
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2- EXIF_TAG_FLASH can't be written from the scratch
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3- GST_TAG_CAPTURE_COLOR_SPACE can't be written from the scratch
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