[Bug 770107] qtdemux: reports only one encryption system even if it can support more than one

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=770107

--- Comment #22 from Xabier Rodríguez Calvar <calvaris at igalia.com> ---
(In reply to Tim-Philipp Müller from comment #20)
> >+  if (stream->protection_scheme_event_queue.length) {
> >+    ...
> >+    walk = stream->protection_scheme_event_queue.tail;
> >+  } else {
> >+    ...
> >+    walk = qtdemux->protection_event_queue.tail;
> >+  }
> >+
> >+  g_value_init (&event_list, GST_TYPE_LIST);
> >+  for (; walk; walk = g_list_previous (walk)) {
> >+    ...
> >+  }
> 
> OOC, what is the reason we're walking the event queues backwards here?

Cause that way, we queue the protection events in the same order they are found
in the media. If we don't walk the queue backwards, we'll have to do it in the
client, but I think pushing the events in the same order they are found is a
good idea.

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