molluskandClaude Opus 4.8
875e6e124c
Replaces the fire-and-forget datagram path with sequenced packets, a per-peer jitter buffer, and persistent per-peer send tasks. Together these fix three intertwined weaknesses that only showed up off localhost. Packet format: every audio frame now carries a 4-byte little-endian sequence number header ([seq][opus payload]), the basis for reordering and loss detection. Jitter buffer (core/jitter.rs): incoming packets are reordered by sequence behind a fixed ~60ms playout delay. Missing sequences with later packets already buffered are concealed via Opus PLC (decode(None)) -- a path the decoder supported but nothing ever invoked. Underruns go idle and re-buffer rather than concealing indefinitely. Covered by unit tests using real encoded frames (reorder, gap-conceal, prime, late-drop). Transport (network/iroh_impl.rs): each peer gets one long-lived send task fed by a shallow bounded channel (drop-oldest on backpressure), instead of spawning a throwaway task per peer per 20ms frame. Connections are now established reactively on peer-join and torn down on peer-leave; the lexicographically-lower EndpointId dials so a full-mesh pair forms exactly one shared bidirectional connection instead of two racing ones. This also removes the previous lock-held-across-connect().await serialization. Opus decoder: PLC output is now sized to one 20ms frame, so concealment synthesizes 20ms instead of a 120ms burst from the oversized max buffer. Known follow-up (Tier 2): no reconnect on transient connection loss; a send error currently retires the peer until they rejoin. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>