Timothy B. Terriberry authored 1 year ago and Jean-Marc Valin committed 1 year ago

Since any value of dQ > 0 will cause the initial quantizer to
 degrade to the format-implied maximum (15) with a sufficient
 number of DRED frames, allow signaling a maximum smaller than 15.
This allows encoders to improve the minimum quality of long DRED
 sequences (at the expense of bitrate) without requiring a constant
 quantizer for all frames (dQ == 0).

We don't need redundancy for the first active frame
since we already have the main Opus payload.

Allows us to exclude the most recent silence from DRED

Adjust q0, qD and duration based on bitrate and loss.

Starting with compute_linear()

Removing some indirections

Only code non-degenerate symbols, which makes the encoder faster

More efficient than PVQ

Also, don't code DRED that's redundant with the main packet

8k, 12k and stereo are mostly untested

Brings the DRED implementation in line with the -00 draft

Everything can now be shallow-copied again