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).

Allows us to exclude the most recent silence from DRED

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

More efficient than PVQ

Brings the DRED implementation in line with the -00 draft

output() renamed to decode(), dred objects using alloc() and free(),
OpusDRED now passed as cost for decoding.

progressive decode, avoid storing DRED decoder state