[Bug 793412] msdk: session close failure if there are multiple sessions in a pipeline

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=793412

Hyunjun Ko <zzoon at igalia.com> changed:

           What    |Removed                     |Added
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 Attachment #368816|reviewed                    |none
             status|                            |
 Attachment #368816|0                           |1
        is obsolete|                            |

--- Comment #7 from Hyunjun Ko <zzoon at igalia.com> ---
Created attachment 369403
  --> https://bugzilla.gnome.org/attachment.cgi?id=369403&action=edit
msdk: manage child sessions on parent GstMsdkContext

Sometimes parent context is released before its children get released.
In this case MFXClose of parent session fails.

To make sure that child sessions are closed before closing a parent session,
Parent context needs to manage child sessions and close them first when it's
released.

------------

rebased.

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