FA-49815 / PCM sample encoding / Member archive

Pcm two tap predictor: history shift · case 05

Both predictor taps retain the newest decoded sample.

Member previewVariant 5 · 3 implementations · 8 checks per implementation

Case contract

Stipulated two-history adaptive PCM decoder with explicit integer predictor coefficients, floor divisor, signed residual nibble and fixed residual amplitude scale.

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	`[[6, 4, -12, 2], 2, 2]`	`[[6, 5, -12, -7], -7, -12]`	Failed

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

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