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punktfunk/crates
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feat(core,android): Automatic bitrate caps at the client decode limit, not the link ceiling
The Automatic bitrate controller only reacted to network signals (loss, capture→received
OWD, FEC-unrecoverable frames, jump-to-live flush), so on a fast LAN feeding a slower
mobile HW decoder it slow-started straight to the link-probe ceiling and parked there —
backlogging frames inside the decoder, where those signals never register, and choking it.
Reported on a Snapdragon 8 Gen 1: Automatic pinned ~500 Mbps with unusable latency.

Feed the client's decode-stage latency (received→decoded) into the controller as a
first-class signal, symmetric with the existing OWD one: a rise over its rolling-min
baseline ends the slow-start climb and, sustained over two windows, backs the rate ×0.7
down to the real decode limit — so Automatic settles where the decoder keeps up.

- core/abr: on_window gains decode_mean_us; a decode_means rolling-min baseline +
  DECODE_RISE_US (15 ms) fold a decode rise into the bad-window logic.
- core/client: per-frame report_decode_us accumulator, drained to a window mean by the
  data-plane pump; wants_decode_latency() gate (Automatic, non-PyroWave) lets embedders
  skip the measurement where it's ignored. Re-target log prints the driving signals.
- android/decode: report the decode stage on both the sync and async decode paths,
  HUD-independent, measured from the AU leaving next_frame (so codec-input backpressure
  is included) and excluding the vsync present wait.

Apple/Windows report_decode_us calls to follow.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
2026-07-15 17:28:11 +02:00
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