[Bug 749590] protection_meta: implement transform function

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=749590

--- Comment #4 from Philippe Normand <phil at base-art.net> ---
This is how I understood the usage of the Protection API anyway:

- qtdemux/dashdemux decorate buffers with protection meta
- demuxers also send protection events downstream
- a decryptor supporting the needed cenc protection system(s) is created and
added after the demuxer

The decryptor would handle the decryption of the incoming buffers and remove
the gst protection meta and other no longer needed caps members and emit
buffers that can be then parsed and decoded.

So I'm trying to use one decryptor implemented as a transform element... But it
can't handle the protection meta because it's been removed.

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