[gstreamer-bugs] [Bug 613690] New: [xmp] refactoring to 1-n tag mappings

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=613690
  GStreamer | gst-plugins-base | git

           Summary: [xmp] refactoring to 1-n tag mappings
    Classification: Desktop
           Product: GStreamer
           Version: git
        OS/Version: All
            Status: UNCONFIRMED
          Severity: enhancement
          Priority: Normal
         Component: gst-plugins-base
        AssignedTo: gstreamer-bugs at lists.sourceforge.net
        ReportedBy: thiago.sousa.santos at collabora.co.uk
         QAContact: gstreamer-bugs at lists.sourceforge.net
      GNOME target: ---
     GNOME version: ---


xmp helper lib needs to be refactored in order to be able to support exif GPS
location tags.

The problems to solve are:

1) Be able to serialize doubles into the exif GPSCoordinate format, which is
'degrees','minutes','seconds'D, where D is a char (N, S, W, E) indicating the
direction.
 - The solution here is to add a serialization/deserialization pair of
functions to each tag mapping so they can handle with the tags in the way it is
requested. If NULL, defaults to the trivial serialization.

2) _ELEVATION tag is mapped into exif:GPSAltitude and exif:GPSAltitudeRef *at
the same time*, so we need a way to have 1-n mappings and be able to
serialize/deserialize it properly.


Patches follow.

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