[Bug 705991] Adding support for DASH common encryption to qtdemux and dashdemux

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=705991

--- Comment #95 from A Ashley <bugzilla at ashley-family.net> ---
Created attachment 300678
  --> https://bugzilla.gnome.org/attachment.cgi?id=300678&action=edit
Creates a GstProtectionMeta object that can be attached to buffers of encrypted
samples

In order to support some types of protected streams (such as those protected
using DASH Common Encryption) some per-buffer information needs to be passed
between elements.

This patch adds a GstMeta type called GstProtectionMeta that allows protection
specific information to be added to a GstBuffer. An example of its usage is
qtdemux providing information to each output sample that enables a downstream
element to decrypt it.

This patch also adds a unit test for GstProtectionMeta that creates
GstProtectionMeta adds and removes it from a buffer and performs some simple
reference count checks.

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