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

[GStreamer (GNOME Bugzilla)]

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

A Ashley <bugzilla at ashley-family.net> changed:

           What    |Removed                     |Added
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 Attachment #301551|needs-work                  |none
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 Attachment #301551|0                           |1
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 Attachment #301554|reviewed                    |none
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 Attachment #301554|0                           |1
        is obsolete|                            |

--- Comment #115 from A Ashley <bugzilla at ashley-family.net> ---
Created attachment 301697
  --> https://bugzilla.gnome.org/attachment.cgi?id=301697&action=edit
Creates gstprotection in GStreamer core

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 adds a utility function to select a supported protection system from
the installed Decryption elements found in the registry. The
gst_protection_select_system function that takes an array of identifiers and
searches the registry for a element of klass Decryptor that supports one or
more of the supplied identifiers. If multiple elements are found, the one with
the highest rank is selected.

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