FA-48895 / PCM sample encoding / Member archive

Validbit left container: left padding shift · case 05

Left justified sample bits are interpreted as right justified.

Member previewVariant 5 · 3 implementations · 8 checks per implementation

Case contract

Extract a signed valid-bit field left justified in an unsigned container; ignore bits above the container and separately return low unused pad bits. valid<container.

Why this case matters

Offline PCM interchange uses these exact bounded packet and sample representation decisions.

One recorded failure

Sample boundary fixture

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

Boundary fixture	Actual	Expected	Outcome
oracle 1	`[[0, 0, 0], [0, 0, 0]]`	`[[-1, 7, 1], [0, 0, 0]]`	Failed

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