[gstreamer-bugs] [Bug 614872] New: [tag] Add basic exif support

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=614872
  GStreamer | gst-plugins-base | git

           Summary: [tag] Add basic exif support
    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: ---


Exif spec describe an image format that can contain raw or jpeg encoded images,
it also specs a tag storage scheme that can be embedded into jpeg/tiff/wav and
avi (that I know). We should have a helper tag library for exif as we have
recently added for xmp.

Spec found at: http://www.exif.org/

Exif uses TIFF's IFD structures to store the tags, the IFD entries store the
tag id, type, size and offset to where it is located. The current patch I'm
attaching here will only handle the case where the tag entries and the tag data
are placed together on the file (as the spec seems to recommend). If you feel
other methods of storing the tags are common and important, please comment
here.

Bug #486659 is related.

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