gstreamer/ext/metadata/TODO


This file contains a list of things to be done as well some open issues (questions) related to design/implementation.

INFO:

1- To see the list of tags current mapped:
  http://webcvs.freedesktop.org/gstreamer/gst-plugins-bad/ext/metadata/metadata_mapping.htm?view=co 

TODO:

1- Add more individual tags to XMP, EXIF and IPTC
2- Get properties like 'width' and 'height' from caps
3- Review the code (in order to move to gst-plugins-good)
4- Document how the plugin works (atchitecture and interaction beteween modules)
5- Improve the test application (to save also in png and to make it possible to set the metadata elements properties)
6- Implement GDateTime support in GLib to be used by GStreamer (http://bugzilla.gnome.org/show_bug.cgi?id=50076)
7- Use a standard GStreamer Data-Time type to map our Data-time tags
8- Make the correct merge mode for multiple value tags (bag and seq) like dc:creator, ...

OPEN ISSUES:

1- What is (How) the best way to delete some tag?
2- How to change metadata when the orignal image was modified.
  ex: file.jpeg has XMP, then we do filesrc ! metadataparse ! jpegdec ! pngenc ! metadatamux ! files
  is the metadata still valid? which fields are no valid anymore?
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.
4- Add GST_TYPE_FRACTION support for GStreamer TAGS
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.
6- language is not considered in XMP (How to do it with GStreamer?)
7- Add a helper function that convert from value to string. For example,
aperture-size is 2.7 and the app wants to show "f/2.7", 'contrast' is a range
and the app wants to show as "Normal", "Soft", "Hard". For the time being it is
up to the APP to make this conversion.

LINKS IN BUGZILA

1- to move to good
  http://bugzilla.gnome.org/show_bug.cgi?id=513182
2- Proposal of new tags
  http://bugzilla.gnome.org/show_bug.cgi?id=482947
  http://bugzilla.gnome.org/show_bug.cgi?id=481169
3- Discussion about the architecture 
  http://bugzilla.gnome.org/show_bug.cgi?id=486659

KNOWN BUGS

bugs in libexif:

1- https://sourceforge.net/tracker/?func=detail&atid=112272&aid=1884609&group_id=12272

  a- EXIF_TAG_ISO_SPEED_RATINGS should be in EXIF_IFD_EXIF
  b- EXIF_TAG_ISO_SPEED_RATINGS is not inserted anyway

2- EXIF_TAG_FLASH can't be written from the scratch

3- GST_TAG_CAPTURE_COLOR_SPACE can't be written from the scratch
Code documentation. Original commit message from CVS: Code documentation. 2007-12-13 17:19:54 +00:00
			`This file contains a list of things to be done as well some open issues (questions) related to design/implementation.`

Some IPTC tags mapped. Original commit message from CVS: Some IPTC tags mapped. 2007-12-21 19:01:00 +00:00			`INFO:`

Map Date-Time and GPS tags and Convert from EXIF to XMP Datatime as local time (those changes has been done in previo... 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) 2008-02-28 10:41:56 +00:00			`1- To see the list of tags current mapped:`
			`http://webcvs.freedesktop.org/gstreamer/gst-plugins-bad/ext/metadata/metadata_mapping.htm?view=co`
Removed gstmetadatacommon. Original commit message from CVS: Removed gstmetadatacommon. 2007-12-21 09:45:56 +00:00
Code documentation. Original commit message from CVS: Code documentation. 2007-12-13 17:19:54 +00:00			`TODO:`

Fixed adding EXIF tags to correct IFD. Mapped some XMP tags. Original commit message from CVS: Fixed adding EXIF tags to correct IFD. Mapped some XMP tags. 2008-01-17 16:10:48 +00:00			`1- Add more individual tags to XMP, EXIF and IPTC`
Added new module for common functions. Using GST_TYPE_FRACTION for Exif (S)Rational types. Original commit message from CVS: Added new module for common functions. Using GST_TYPE_FRACTION for Exif (S)Rational types. 2007-12-14 18:18:37 +00:00			`2- Get properties like 'width' and 'height' from caps`
			`3- Review the code (in order to move to gst-plugins-good)`
			`4- Document how the plugin works (atchitecture and interaction beteween modules)`
Map more Exif tags. Original commit message from CVS: Map more Exif tags. 2008-02-02 20:22:19 +00:00			`5- Improve the test application (to save also in png and to make it possible to set the metadata elements properties)`
Map Date-Time and GPS tags and Convert from EXIF to XMP Datatime as local time (those changes has been done in previo... 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) 2008-02-28 10:41:56 +00:00			`6- Implement GDateTime support in GLib to be used by GStreamer (http://bugzilla.gnome.org/show_bug.cgi?id=50076)`
			`7- Use a standard GStreamer Data-Time type to map our Data-time tags`
			`8- Make the correct merge mode for multiple value tags (bag and seq) like dc:creator, ...`
Code documentation. Original commit message from CVS: Code documentation. 2007-12-13 17:19:54 +00:00
			`OPEN ISSUES:`

			`1- What is (How) the best way to delete some tag?`
			`2- How to change metadata when the orignal image was modified.`
			`ex: file.jpeg has XMP, then we do filesrc ! metadataparse ! jpegdec ! pngenc ! metadatamux ! files`
			`is the metadata still valid? which fields are no valid anymore?`
Fixed adding EXIF tags to correct IFD. Mapped some XMP tags. Original commit message from CVS: Fixed adding EXIF tags to correct IFD. Mapped some XMP tags. 2008-01-17 16:10:48 +00:00			`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.`
			`4- Add GST_TYPE_FRACTION support for GStreamer TAGS`
			`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.`
			`6- language is not considered in XMP (How to do it with GStreamer?)`
Map Date-Time and GPS tags and Convert from EXIF to XMP Datatime as local time (those changes has been done in previo... 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) 2008-02-28 10:41:56 +00:00			`7- Add a helper function that convert from value to string. For example,`
			`aperture-size is 2.7 and the app wants to show "f/2.7", 'contrast' is a range`
			`and the app wants to show as "Normal", "Soft", "Hard". For the time being it is`
			`up to the APP to make this conversion.`
Code documentation. Original commit message from CVS: Code documentation. 2007-12-13 17:19:54 +00:00
Just uptade the ToDo list. Original commit message from CVS: Just uptade the ToDo list. 2008-01-30 16:53:40 +00:00			`LINKS IN BUGZILA`

			`1- to move to good`
Map Date-Time and GPS tags and Convert from EXIF to XMP Datatime as local time (those changes has been done in previo... 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) 2008-02-28 10:41:56 +00:00			`http://bugzilla.gnome.org/show_bug.cgi?id=513182`
Just uptade the ToDo list. Original commit message from CVS: Just uptade the ToDo list. 2008-01-30 16:53:40 +00:00			`2- Proposal of new tags`
Map Date-Time and GPS tags and Convert from EXIF to XMP Datatime as local time (those changes has been done in previo... 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) 2008-02-28 10:41:56 +00:00			`http://bugzilla.gnome.org/show_bug.cgi?id=482947`
			`http://bugzilla.gnome.org/show_bug.cgi?id=481169`
Just uptade the ToDo list. Original commit message from CVS: Just uptade the ToDo list. 2008-01-30 16:53:40 +00:00			`3- Discussion about the architecture`
Map Date-Time and GPS tags and Convert from EXIF to XMP Datatime as local time (those changes has been done in previo... 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) 2008-02-28 10:41:56 +00:00			`http://bugzilla.gnome.org/show_bug.cgi?id=486659`
Just uptade the ToDo list. Original commit message from CVS: Just uptade the ToDo list. 2008-01-30 16:53:40 +00:00
New base class for metadata elements. Original commit message from CVS: New base class for metadata elements. 2007-12-19 09:50:47 +00:00			`KNOWN BUGS`

Map more Exif tags. Original commit message from CVS: Map more Exif tags. 2008-02-02 20:22:19 +00:00			`bugs in libexif:`

Map Date-Time and GPS tags and Convert from EXIF to XMP Datatime as local time (those changes has been done in previo... 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) 2008-02-28 10:41:56 +00:00			`1- https://sourceforge.net/tracker/?func=detail&atid=112272&aid=1884609&group_id=12272`
Map more Exif tags. Original commit message from CVS: Map more Exif tags. 2008-02-02 20:22:19 +00:00
Map Date-Time and GPS tags and Convert from EXIF to XMP Datatime as local time (those changes has been done in previo... 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) 2008-02-28 10:41:56 +00:00			`a- EXIF_TAG_ISO_SPEED_RATINGS should be in EXIF_IFD_EXIF`
			`b- EXIF_TAG_ISO_SPEED_RATINGS is not inserted anyway`
Map more Exif tags. Original commit message from CVS: Map more Exif tags. 2008-02-02 20:22:19 +00:00
Map Date-Time and GPS tags and Convert from EXIF to XMP Datatime as local time (those changes has been done in previo... 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) 2008-02-28 10:41:56 +00:00			`2- EXIF_TAG_FLASH can't be written from the scratch`
Add lot of documentation. Original commit message from CVS: Add lot of documentation. 2008-01-25 17:45:28 +00:00
Map Date-Time and GPS tags and Convert from EXIF to XMP Datatime as local time (those changes has been done in previo... 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) 2008-02-28 10:41:56 +00:00			`3- GST_TAG_CAPTURE_COLOR_SPACE can't be written from the scratch`