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punktfunk/clients/cli
enricobuehlerandClaude Fable 5 f4f83202cb
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feat(core/client): an AU's prefix reaches the decoder while its tail is on the wire
Delivery used to be all-or-nothing: the decoder saw byte 0 only after the
last packet of the AU landed, so the whole transmit time sat in front of
decode. With the slice-streamed wire (previous commit) blocks now arrive
addressable, and a client can opt in (connect's new frame_parts) to
receive each AU's newly-contiguous prefix as Frame::part pieces - offset
tiling, first/last marked, the completing push carrying only the suffix.
A PARTIAL_FRAME-capable decoder then chews slices concurrently with the
remaining network transfer.

The reassembler walks a per-frame cursor over successfully-completed
blocks (failed FEC reconstructs don't advance it), coalesces blocks that
finished out of order into one part, keeps probe filler whole, and stops
short of the final block so the zero-padded tail still trims at
completion. Whole-frame consumers see byte-identical behavior - parts
never flow without the opt-in, and never on PyroWave (its newest-wins
draining assumes whole AUs).

Per-AU accounting keeps its units: OWD/ABR feeds, the inter-arrival
series and the clock-based jump-to-live detector only count completing
deliveries, and FrameChannel::depth() counts AUs so a part-rich queue
can't trip jump-to-live at a fraction of the real backlog. The consumer
contract (gap or orphan part = AU lost: abandon, flush, resync on the
next first) is documented on FramePart; the C ABI keeps parts off until
PunktfunkFrame can express them.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
2026-07-31 14:14:46 +02:00
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