[Bug 756897] qtdemux: cenc aux_info_type endianness issue

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=756897

--- Comment #20 from Greg Rutz <g.rutz at cablelabs.com> ---
All multi-byte fields, including FOURCCs, in ISOBMFF files (MOV, MP4, QT, etc)
are big-endian.

FWIW, the comment in the definition for GST_MAKE_FOURCC says:

"Transform four characters into a #guint32 fourcc value with host endianness"

If this were true, I would expect that this function would be different on
platforms with different endianness.  But I don't think that is the case. 
Seems like the decision was made at some point to always store FOURCC values in
GStreamer as little-endian.

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