[FFmpeg-devel] [PATCH] 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, using a z=0.64).

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.

Patch attached.

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