first attempt of C implementation of fec encoder (not tested yet due to NEON/DOT_PROD not being separable)

Helps reduce the error on the most recent frames

Can now inject FEC features to be used by the PLC when available

Swish has lower loss, but doesn't seem to improve quality

Jan Buethe authored 2 years ago and Jean-Marc Valin committed 2 years ago

Model now stores LPC gamma, look-ahead, and end-to-end.
Parameters aren't quite reliable yet, YMMV

Helps forget concealment features faster