[Bug 760590] query: recursive accept-caps query

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=760590

--- Comment #2 from Thiago Sousa Santos <thiagossantos at gmail.com> ---
(In reply to Olivier Crête from comment #1)
> Any reason is not just do a query caps with the desired caps as a filter and
> check if the return value is empty or not? That should be the equivalent of
> a recursive accept-caps? I guess we could add some helper functions to for
> the intersections vs subset case.

Suppose you have an element that does h264 and has in its template caps:

video/x-h264, stream-format=byte-stream, alignment=nal

If you do a caps query with "video/x-h264, stream-format=byte-stream" as a
filter it will return 'video/x-h264, stream-format=byte-stream, alignment=nal'
but if you send a caps event with the same caps it will fail because of the
subset check.

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