FA-49063 / PCM sample encoding / Member archive
Xor coded pcm: width mask · case 03
A single boundary bit is used where a contiguous field mask is required.
Case contract
Undo a per-line XOR inversion map within a signed PCM field before interpreting sign and detecting canonical zero.
Why this case matters
Offline PCM interchange uses these exact bounded packet and sample representation decisions.
One recorded failure
Sample boundary fixtureThis sample comes from the broken implementation of a controlled reproducer.
| Boundary fixture | Actual | Expected | Outcome |
|---|---|---|---|
| oracle 1 | [[0, true], [0, true], [0, true], [0, true], [0, true]] | [[5, false], [6, false], [2, false], [-3, false], [-6, false]] | Failed |
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