[FFmpeg-devel] [PATCH v2] opusdsp: add ability to modify deemphasis constant

[Lynne]

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.

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