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punktfunk/crates/punktfunk-host/src
enricobuehler bbe4380b41
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perf(latency): T1.1 frame-driven encode trigger + T1.4 time-based flush thresholds
design/latency-reduction-2026-07.md tier 1, remaining halves:

- T1.1: the native encode loop wakes on the capture's ACTUAL arrival instead of
  sampling at a free-running tick — deletes the sample-and-hold (~half a frame
  interval on average, a full one worst-case: ~8ms avg @60fps). New
  Capturer::supports_arrival_wait/wait_arrival pair (IDD-push waits its
  frame-ready event against the shared-header token; the PipeWire portal blocks
  its channel with a pending stash); backends without an arrival signal — and
  PUNKTFUNK_FRAME_DRIVEN=0 — keep the legacy tick bit-identically. A
  0.9x-interval rate floor caps encode at ~1.11x target when the compositor
  outruns the session; a +0.5x-interval keepalive keeps static desktops
  re-encoding at 1.5x-interval cadence. Pacing deadlines re-anchor to the
  actual submit so they can't drift against the arrival clock. GameStream
  plane untouched.
- T1.4: the jump-to-live detectors run on WALL-CLOCK now (STANDING_TIME /
  FLUSH_AFTER = 250ms) instead of 30-frame counts whose meaning scaled with
  fps (500ms @60 but 125ms @240 — and stretching further under T1.1's slower
  static-scene repeats). The queue trip also requires depth still >= high, so
  a hysteresis-band hover can't fire on elapsed time alone.

Validated: .21 Linux 185 core + 177 host + pf-capture tests, clippy
-D warnings; .133 Windows cargo check of pf-capture + punktfunk-host green.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
2026-07-17 19:31:49 +02:00
..
2026-07-04 13:52:17 +02:00