The return path. A frame still waiting is asked for by chunk after 64 ms,
then every 32 ms, three times, on the previous receiver's field-tested
cadence; a repair request never asks for a keyframe, since it exists so
that one is not needed. A frame given up on is reported late, and once
per 500 ms a keyframe is requested, because whatever depended on it
cannot be decoded either. Records are built by CultLib's
build_receiver_feedback and sent down the producer's own session on the
media channel; with nobody attached they are counted as not sent rather
than lost quietly.
The loopback test runs the whole path over real sockets: a producer
connects, loses one chunk, is asked for exactly that chunk with no
keyframe request, and when the frame ages out hears it was late and
that a keyframe is wanted.
cargo test -p ratatoskr-core -> 28 passed
Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
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