[Bug 749590] protection_meta: implement transform function

[GStreamer (GNOME Bugzilla)]

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

--- Comment #9 from Philippe Normand <phil at base-art.net> ---
Yes the decryptor is basetransform derived, but it receives a read-only buffer
and needs to do an in-place transform so a writable buffer is created from the
read-only buffer, AFAIU.

And yes the decryptor is right after the demuxer. The decryptor actually needs
to read the meta to perform the content decryption, AFAIK :)

Perhaps I'm missing something there, should the decryptor then have a custom
prepare_output_buffer implementation that would take care of copying the meta?

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