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David Chen
d269ac59dd
Carry repair sequence state through the existing DownTrack GetState/SeedState handoff so cached transceiver reuse preserves SRTP sequence continuity. Close the old encoder before saving its sequence, and allocate its media group only when protection is first used. Apply subscriber settings from one immutable snapshot and discard superseded updates. Preserve upstream FEC on shared sendrecv codec lists when downstream generation is disabled. Lock the source RTP stats while seeding a replacement sender to avoid racing its final snapshot update. Align field and import grouping with the surrounding implementation. Add regressions for sequence wrap/rebind, SRTP sender reuse, concurrent settings, superseded updates, and independent negotiation flags. Validation: full race suites passed for pkg/sfu/flexfec, pkg/sfu/pacer, pkg/sfu/rtpstats, pkg/sfu, and pkg/rtc. Encoder benchmarks remain approximately 1.9-2.5 us per five 1200-byte media packets at low/medium/high protection; disabled encoding has zero allocations.