FA-48899 / PCM sample encoding / Member archive

Validbit left container: valid mask · case 04

Bits above the declared container leak into the valid field.

Member previewVariant 4 · 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 3	`[[8, 15], [0, 0]]`	`[[-8, -1], [0, 0]]`	Failed

MEMBER ARCHIVE

The complete case is available to members.

This record includes three runnable implementations, regression fixtures, execution results, and source hashes.

Member access is invitation-based. Sign in with your invited account to inspect the sources.