FA-81660 / MIDI event timing / Member archive

14-bit pitch bend to cents: eight-bit data bytes accepted · case 05

A data byte of 128 (a status byte) is accepted and folded into the bend value.

Member previewVariant 5 · 3 implementations · 8 checks per implementation

Case contract

Input [lsb, msb, range_semitones] with 7-bit data bytes. value = msb*128 + lsb, offset = value - 8192. Positive offsets scale to +range by dividing by 8191, negative ones by 8192. cents = offset * range * 100 / divisor, rounded half away from zero. Invalid bytes or negative range return 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 1	`200`	`null`	Failed

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