FA-81342 / MIDI event timing / Member archive

Variable-length quantity delta encoder: leading bytes emitted without continuation flag · case 02

Delta 128 is written as [1, 0], which a reader decodes as two separate deltas 1 and 0.

Member previewVariant 2 · 3 implementations · 8 checks per implementation

Case contract

Input a delta-time integer 0..0x0FFFFFFF (booleans rejected). Encode as 7-bit groups, most significant group first, with bit 7 set on every byte except the last. Zero encodes as [0]. Out-of-range or non-integer input 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 1	`[1, 1]`	`[129, 1]`	Failed

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