[gstreamer-bugs] [Bug 345352] [API] query tag setters (and getters?) for supported tags

[GStreamer (bugzilla.gnome.org)]

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  GStreamer | gstreamer (core) | Ver: HEAD CVS




------- Comment #2 from René Stadler  2007-09-26 10:29 UTC -------
I had the idea of using filter functions for tag lists.  From an application
standpoint (like a coverage generator) it would look like this:

Merge some tags using gst_tag_setter_{add,merge}_tags as usual.  The new
behavior of the element would imply that it filters out unsupported tags in the
process.  The app can then peek at the list with gst_tag_setter_get_tag_list to
check which tags got accepted.

Elements that have not been updated to the new behavior would be easily
identified by feeding a non-existant dummy tag as bait, since they accept
anything silently without checking.

I don't know how complex or ugly the implementation would have to be, so this
idea might be completely cracked after all.


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