P2P calls now adapt codec quality based on observed network conditions,
matching what relay calls already had.
Three-layer implementation:
- QualityReport::from_path_stats(): construct reports from local quinn
stats (loss%, RTT, jitter) without needing relay-generated reports
- CallEncoder.pending_quality_report: one-shot attachment to next
source packet (consumed on encode, not repeated)
- Engine send tasks: generate quality report every 50 frames (~1s)
from quinn_path_stats() and attach via set_pending_quality_report()
- Engine recv tasks: self-observe from own QUIC path stats every 50
packets, feed to AdaptiveQualityController for P2P adaptation
(works even if peer isn't sending quality reports yet)
Both relay and P2P calls now have adaptive quality. On relay calls,
both peer-sent reports AND local observations feed the controller.
Hysteresis (3 consecutive bad reports to downgrade) prevents thrashing.
372 tests passing (+4 new: from_path_stats encoding, clamping, zero
values, encoder quality report attachment).
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
1e82811cc1