[FFmpeg-soc] [RFC] AAC invalid 5.1 streams

[Andreas Öman]

Hi,

I've discovered that some 5.1 streams incorrectly seem to encode the LFE
element as a second SCE (Single Channel Element). With the previous
channel management in AAC this was less of a problem as it just kept
adding elements as it discovered them.

So, in order to comply with these broken streams a kludge is needed
(attached).

I still believe that my version is better because:

* It's written to comply with the standard,
   not to make things up as we go.

* It's more compact, and much less code in the output-mixer stage.

Just want to inform you guys on whats going on. If nobody objects
I'll commit it.
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