FA-81492 / MIDI event timing / Member archive

Set Tempo meta event to BPM: tempo value read little-endian · case 02

120 BPM (07 A1 20) is read as 2138375 microseconds, about 28 BPM.

Member previewVariant 2 · 3 implementations · 8 checks per implementation

Case contract

Input the bytes of a Set Tempo meta event: FF 51 03 followed by a 24-bit big-endian microseconds-per-quarter value (nonzero). Return [microseconds, bpm_x100] where bpm_x100 = 6000000000 / microseconds rounded half up. Anything else 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	`[2138375, 2806]`	`[500000, 12000]`	Failed

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