[Bug 770107] qtdemux: reports only one encryption system even if it can support more than one

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=770107

--- Comment #18 from Enrique Ocaña González <eocanha at igalia.com> ---
Created attachment 352263
  --> https://bugzilla.gnome.org/attachment.cgi?id=352263&action=edit
3/3 qtdemux: also push buffers without encryption info instead of dropping them

Test "17. PlayReadyH264Video" in YouTube leanback EME conformance tests 2016
for H.264[1] uses a media file[2] with cenc encryption whose first two 'moof'
boxes have no encryption information (no 'saiz' and 'saio' boxes).

Those boxes are actually not encrypted and the current qtdemux implementation
was just dropping them, breaking the test use case.

This patch detects those kind of situations and just lets the unencrypted
buffers pass. Of course, this needs some collaboration by the decryptors,
which should also do the same and not to try to decrypt those clear buffers.

[1]
http://yt-dash-mse-test.commondatastorage.googleapis.com/unit-tests/2016.html?test_type=encryptedmedia-test&webm=false
[2]
http://yt-dash-mse-test.commondatastorage.googleapis.com/unit-tests/media/oops_cenc-20121114-142.mp4

This patch depends on the previous two patches being applied.

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