FA-49272 / PCM sample encoding / Member archive
Pcm mid side lifting: lifting rounding · case 02
Truncation toward zero differs from floor on negative odd side codes.
Case contract
Encode stereo integer PCM through reversible floor lifting: side=L-R, mid=R+floor(side/2), with an explicit odd-side parity sideband.
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 | [[3, 3, 1], [4, -3, 1]] | [[3, 3, 1], [3, -3, 1]] | Failed |
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