Replace the fixed 3-frame (~60ms) playout delay with a feedback
controller that tunes depth to real network behavior, no wall clock
needed:
- Grow (+1 frame) on a late-arriving packet (one for a sequence already
played past) or a gap that forces Opus PLC — jitter beat the cushion.
- Shrink (-1 frame) after a long unbroken run of real frames — the link
is comfortably ahead. Fast grow, slow shrink (AIMD-style).
- Bounded to [2, 12] frames (40-240ms), well under MAX_BUFFERED_FRAMES.
- Benign silence (a talker pausing) emits none of these signals, so the
delay is untouched across quiet stretches — avoids the classic
"inflate delay because someone went quiet" bug.
- Prime-timeout safety net: since the mixer polls every ~20ms, prime
after ~500ms even under a grown target so a short utterance isn't held
forever and startup latency stays bounded.
No public API change; all logic stays in jitter.rs. Adds 8 unit tests
(grow/shrink, both bounds, silence-neutrality, prime timeout).
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
molluskandClaude Opus 4.8
4e8074cb92