nx_room_jitterbuf.nx

nx_room_jitterbuf.nx -- X-ROOM (overseas-grade): sovereign DETERMINISTIC ADAPTIVE JITTER BUFFER. After loss (handled by nx_room_fec), JITTER is the other killer of intercontinental calls: packets over a long-haul path arrive with variable delay, so a fixed buffer is either too small (late packets dropped = choppy) or too big (constant added latency). This sizes the buffer from MEASURED jitter, causally. MODEL: r[i] = packet i's arrival delay RELATIVE to its ideal playout slot (ms), anchored at packet 0 (clock-offset-free). A packet is ON-TIME iff r[i] <= target depth chosen from PAST jitter (env = peak-hold with linear decay): target = clamp(env+margin, min, max). Late packets are counted (they'd be concealed). latency cost = the buffer depth (target); loss = #late. EXCEED axis (honest) vs Zoom/WebRTC/Teams jitter buffers: a deterministic, audit-replayable depth controller that PARETO-DOMINATES fixed buffers on the same trace -- fewer late-losses than a fixed-SMALL buffer AND lower average latency than a fixed-LARGE buffer that achieves the same loss. Sovereign, integer-exact. main() is the SELF-VALIDATING GATE. Evidence -> knowledge/status/room_jitterbuf.log. HONEST SCOPE: causal depth control on a relative-delay trace; full RFC3550 inter- arrival estimator + playout-clock resync = deeper rung. license_tier: ORIGINAL