Apr 24, 2024, 10:54 by dev@lynne.ee:

> xHE-AAC relies on the same postfilter mechanism
> that Opus uses to improve clarity (albeit with a steeper
> deemphasis filter).
>
> The code to apply it is identical, it's still just a
> simple IIR low-pass filter. This commit makes it possible
> to use alternative constants.
>
> Version 2 changes:
> Move the deemphasis constant table to opustab.c and
> document its values better.
>

v3 attached, forgot to port the native opus encoder.