[Bug 765275] matroska: implement reading & writing ContentEncryption headers

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=765275

--- Comment #12 from y.bandou <bandou.yacine at gmail.com> ---
Created attachment 354562
  --> https://bugzilla.gnome.org/attachment.cgi?id=354562&action=edit
matroska: Add support for encrypted content with protection API

This patch:

1.Parse the WebM ContentEncryption subelements.

2.Create a GST_PROTECTION event for each ContentEncryption, which will be
  sent before the first source buffer.
  The GST_PROTECTION event doesn't contain the "system_id", DRM system id,
  field because it hasn't been specified neither by Matroska nor by the WebM
  spec.
  For this reason we make DRM system id optional in GST_PROTECTION event.
  See: https://bugzilla.gnome.org/show_bug.cgi?id=784129

3.Parse the protection information of encrypted Block/SimpleBlock, extract
  the IV and the partitioning format (subsamples).

4.Create the metadata protection for each encrypted Block/SimpleBlock, with
  those informations: KeyID (extracted from ContentEncryption element), IV and
  partitioning format.

  The protection metadata follows the same format as qtdemux.

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