FA-50308 / PCM sample encoding / Member archive

Pcm channel lifting chain: first residual channel · case 03

The literal anchor is also encoded as a residual, adding a channel.

Member previewVariant 3 · 3 implementations · 8 checks per implementation

Case contract

Losslessly represent each PCM frame as a first-channel anchor followed by differences from immediately preceding original channels; preserve empty and mono frames.

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	`[[3, 0, 2, 3], [1, 0, 1, 2]]`	`[[3, 2, 3], [1, 1, 2]]`	Failed

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