FA-81829 / MIDI event timing / Member archive

Event placement inside an audio render buffer: event sample position truncated · case 04

Events between two samples always land on the earlier sample; a half-sample event plays early.

Member previewVariant 4 · 3 implementations · 8 checks per implementation

Case contract

Input [sample_rate, buffer_start_sample, buffer_size, event_times_us]. Each event maps to sample position us*rate/1000000 rounded half up. Positions before the buffer start are "late", positions at or after start+size are "future", otherwise the offset within the buffer. Invalid rate or size returns None.

Why this case matters

MIDI sequencers, file readers and synth drivers depend on exact event ordering and tick/time arithmetic.

One recorded failure

Sample boundary fixture

This sample comes from the broken implementation of a controlled reproducer.

Boundary fixture	Actual	Expected	Outcome
oracle 0	`[0, "future", 511, "late"]`	`[0, "future", 511, 0]`	Failed

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