FAILURE MAP
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FA-49086 / PCM sample encoding / Open access

Pcm byte lane shuffle: output width · case 01

Converted sample width is reported as input container width.

Verified by executionVariant 1 · 8 checks per implementationDownload source bundle ↓JSON ↗

ROOT CAUSE

Converted sample width is reported as input container width.

VERIFIED REPAIR

Use the stated conversion contract at output width.

Unsuccessful approach: Reporting padding width does not describe emitted payload size.

Case contract

Repack each fixed-size sample container using an explicit byte-lane map, retain duplicate selections and validate only declared zero-pad lanes.

Why this case matters

Offline PCM interchange uses these exact bounded packet and sample representation decisions.

1 / The failure

Exit 1
"""Failure Map reference implementation. Python standard library only."""
import json

N = 1
observations = []
def solve(packets, lanes, ignored):
    out=[]
    for packet in packets:
        selected=[packet[i] for i in lanes]
        ignored_values=[packet[i] for i in ignored]
        good=all(value==0 for value in ignored_values)
        out.append([selected,good,len(packet)])
    return out
def check(label, actual, expected):
    observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
check('oracle 1', solve(*([[1, 0, 2, 0], [3, 0, 4, 5]], [2, 0], [1, 3])), [[[2, 1], True, 2], [[4, 3], False, 2]])
check('oracle 2', solve(*([[8, 9]], [1, 0, 1], [])), [[[9, 8, 9], True, 3]])
check('oracle 3', solve(*([], [], [])), [])
check('oracle 4', solve(*([[0, 1, 0]], [1], [0, 2])), [[[1], True, 1]])
check('oracle 5', solve(*([[0, 0]], [], [0, 1])), [[[], True, 0]])
check('oracle 6', solve(*([[4, 3, 2, 1]], [3, 1, 0], [2])), [[[1, 3, 4], False, 3]])
check('oracle 7', solve(*([[1]], [0], [])), [[[1], True, 1]])
if N == 1: check('variant packet 1', solve(*[[[1, 0, 2, 0], [3, 0, 4, 5], [1, 0, 2, 0], [3, 0, 4, 5]], [2, 0], [1, 3]]), [[[2, 1], True, 2], [[4, 3], False, 2], [[2, 1], True, 2], [[4, 3], False, 2]])
if N == 2: check('variant packet 2', solve(*[[[1, 0, 2, 0], [3, 0, 4, 5], [1, 0, 2, 0], [3, 0, 4, 5], [1, 0, 2, 0], [3, 0, 4, 5]], [2, 0], [1, 3]]), [[[2, 1], True, 2], [[4, 3], False, 2], [[2, 1], True, 2], [[4, 3], False, 2], [[2, 1], True, 2], [[4, 3], False, 2]])
if N == 3: check('variant packet 3', solve(*[[[1, 0, 2, 0], [3, 0, 4, 5], [1, 0, 2, 0], [3, 0, 4, 5], [1, 0, 2, 0], [3, 0, 4, 5], [1, 0, 2, 0], [3, 0, 4, 5]], [2, 0], [1, 3]]), [[[2, 1], True, 2], [[4, 3], False, 2], [[2, 1], True, 2], [[4, 3], False, 2], [[2, 1], True, 2], [[4, 3], False, 2], [[2, 1], True, 2], [[4, 3], False, 2]])
if N == 4: check('variant packet 4', solve(*[[[1, 0, 2, 0], [3, 0, 4, 5], [1, 0, 2, 0], [3, 0, 4, 5], [1, 0, 2, 0], [3, 0, 4, 5], [1, 0, 2, 0], [3, 0, 4, 5], [1, 0, 2, 0], [3, 0, 4, 5]], [2, 0], [1, 3]]), [[[2, 1], True, 2], [[4, 3], False, 2], [[2, 1], True, 2], [[4, 3], False, 2], [[2, 1], True, 2], [[4, 3], False, 2], [[2, 1], True, 2], [[4, 3], False, 2], [[2, 1], True, 2], [[4, 3], False, 2]])
if N == 5: check('variant packet 5', solve(*[[[1, 0, 2, 0], [3, 0, 4, 5], [1, 0, 2, 0], [3, 0, 4, 5], [1, 0, 2, 0], [3, 0, 4, 5], [1, 0, 2, 0], [3, 0, 4, 5], [1, 0, 2, 0], [3, 0, 4, 5], [1, 0, 2, 0], [3, 0, 4, 5]], [2, 0], [1, 3]]), [[[2, 1], True, 2], [[4, 3], False, 2], [[2, 1], True, 2], [[4, 3], False, 2], [[2, 1], True, 2], [[4, 3], False, 2], [[2, 1], True, 2], [[4, 3], False, 2], [[2, 1], True, 2], [[4, 3], False, 2], [[2, 1], True, 2], [[4, 3], False, 2]])
print(json.dumps({"observations": observations, "passed": all(x["passed"] for x in observations)}, ensure_ascii=False))
raise SystemExit(0 if all(x["passed"] for x in observations) else 1)
Boundary fixtureActualExpectedOutcome
oracle 1[[[2, 1], True, 4], [[4, 3], False, 4]][[[2, 1], True, 2], [[4, 3], False, 2]]Failed
oracle 2[[[9, 8, 9], True, 2]][[[9, 8, 9], True, 3]]Failed
oracle 3[][]Passed
oracle 4[[[1], True, 3]][[[1], True, 1]]Failed
oracle 5[[[], True, 2]][[[], True, 0]]Failed
oracle 6[[[1, 3, 4], False, 4]][[[1, 3, 4], False, 3]]Failed
oracle 7[[[1], True, 1]][[[1], True, 1]]Passed
variant packet 1[[[2, 1], True, 4], [[4, 3], False, 4], [[2, 1], True, 4], [[4, 3], False, 4]][[[2, 1], True, 2], [[4, 3], False, 2], [[2, 1], True, 2], [[4, 3], False, 2]]Failed

SHA-256 / 442cba3658b9bd8fe6ef61fdaff1828b2bc839da420c12e38cbefedb41fd81c5

2 / The unsuccessful fix

Exit 1
"""Failure Map reference implementation. Python standard library only."""
import json

N = 1
observations = []
def solve(packets, lanes, ignored):
    out=[]
    for packet in packets:
        selected=[packet[i] for i in lanes]
        ignored_values=[packet[i] for i in ignored]
        good=all(value==0 for value in ignored_values)
        out.append([selected,good,len(ignored)])
    return out
def check(label, actual, expected):
    observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
check('oracle 1', solve(*([[1, 0, 2, 0], [3, 0, 4, 5]], [2, 0], [1, 3])), [[[2, 1], True, 2], [[4, 3], False, 2]])
check('oracle 2', solve(*([[8, 9]], [1, 0, 1], [])), [[[9, 8, 9], True, 3]])
check('oracle 3', solve(*([], [], [])), [])
check('oracle 4', solve(*([[0, 1, 0]], [1], [0, 2])), [[[1], True, 1]])
check('oracle 5', solve(*([[0, 0]], [], [0, 1])), [[[], True, 0]])
check('oracle 6', solve(*([[4, 3, 2, 1]], [3, 1, 0], [2])), [[[1, 3, 4], False, 3]])
check('oracle 7', solve(*([[1]], [0], [])), [[[1], True, 1]])
if N == 1: check('variant packet 1', solve(*[[[1, 0, 2, 0], [3, 0, 4, 5], [1, 0, 2, 0], [3, 0, 4, 5]], [2, 0], [1, 3]]), [[[2, 1], True, 2], [[4, 3], False, 2], [[2, 1], True, 2], [[4, 3], False, 2]])
if N == 2: check('variant packet 2', solve(*[[[1, 0, 2, 0], [3, 0, 4, 5], [1, 0, 2, 0], [3, 0, 4, 5], [1, 0, 2, 0], [3, 0, 4, 5]], [2, 0], [1, 3]]), [[[2, 1], True, 2], [[4, 3], False, 2], [[2, 1], True, 2], [[4, 3], False, 2], [[2, 1], True, 2], [[4, 3], False, 2]])
if N == 3: check('variant packet 3', solve(*[[[1, 0, 2, 0], [3, 0, 4, 5], [1, 0, 2, 0], [3, 0, 4, 5], [1, 0, 2, 0], [3, 0, 4, 5], [1, 0, 2, 0], [3, 0, 4, 5]], [2, 0], [1, 3]]), [[[2, 1], True, 2], [[4, 3], False, 2], [[2, 1], True, 2], [[4, 3], False, 2], [[2, 1], True, 2], [[4, 3], False, 2], [[2, 1], True, 2], [[4, 3], False, 2]])
if N == 4: check('variant packet 4', solve(*[[[1, 0, 2, 0], [3, 0, 4, 5], [1, 0, 2, 0], [3, 0, 4, 5], [1, 0, 2, 0], [3, 0, 4, 5], [1, 0, 2, 0], [3, 0, 4, 5], [1, 0, 2, 0], [3, 0, 4, 5]], [2, 0], [1, 3]]), [[[2, 1], True, 2], [[4, 3], False, 2], [[2, 1], True, 2], [[4, 3], False, 2], [[2, 1], True, 2], [[4, 3], False, 2], [[2, 1], True, 2], [[4, 3], False, 2], [[2, 1], True, 2], [[4, 3], False, 2]])
if N == 5: check('variant packet 5', solve(*[[[1, 0, 2, 0], [3, 0, 4, 5], [1, 0, 2, 0], [3, 0, 4, 5], [1, 0, 2, 0], [3, 0, 4, 5], [1, 0, 2, 0], [3, 0, 4, 5], [1, 0, 2, 0], [3, 0, 4, 5], [1, 0, 2, 0], [3, 0, 4, 5]], [2, 0], [1, 3]]), [[[2, 1], True, 2], [[4, 3], False, 2], [[2, 1], True, 2], [[4, 3], False, 2], [[2, 1], True, 2], [[4, 3], False, 2], [[2, 1], True, 2], [[4, 3], False, 2], [[2, 1], True, 2], [[4, 3], False, 2], [[2, 1], True, 2], [[4, 3], False, 2]])
print(json.dumps({"observations": observations, "passed": all(x["passed"] for x in observations)}, ensure_ascii=False))
raise SystemExit(0 if all(x["passed"] for x in observations) else 1)
Boundary fixtureActualExpectedOutcome
oracle 1[[[2, 1], True, 2], [[4, 3], False, 2]][[[2, 1], True, 2], [[4, 3], False, 2]]Passed
oracle 2[[[9, 8, 9], True, 0]][[[9, 8, 9], True, 3]]Failed
oracle 3[][]Passed
oracle 4[[[1], True, 2]][[[1], True, 1]]Failed
oracle 5[[[], True, 2]][[[], True, 0]]Failed
oracle 6[[[1, 3, 4], False, 1]][[[1, 3, 4], False, 3]]Failed
oracle 7[[[1], True, 0]][[[1], True, 1]]Failed
variant packet 1[[[2, 1], True, 2], [[4, 3], False, 2], [[2, 1], True, 2], [[4, 3], False, 2]][[[2, 1], True, 2], [[4, 3], False, 2], [[2, 1], True, 2], [[4, 3], False, 2]]Passed

SHA-256 / dc028731104fcc036e41ed957cf621be4343c57359e370bba40f5d352d087efc

3 / The verified repair

Exit 0
"""Failure Map reference implementation. Python standard library only."""
import json

N = 1
observations = []
def solve(packets, lanes, ignored):
    out=[]
    for packet in packets:
        selected=[packet[i] for i in lanes]
        ignored_values=[packet[i] for i in ignored]
        good=all(value==0 for value in ignored_values)
        out.append([selected,good,len(selected)])
    return out
def check(label, actual, expected):
    observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
check('oracle 1', solve(*([[1, 0, 2, 0], [3, 0, 4, 5]], [2, 0], [1, 3])), [[[2, 1], True, 2], [[4, 3], False, 2]])
check('oracle 2', solve(*([[8, 9]], [1, 0, 1], [])), [[[9, 8, 9], True, 3]])
check('oracle 3', solve(*([], [], [])), [])
check('oracle 4', solve(*([[0, 1, 0]], [1], [0, 2])), [[[1], True, 1]])
check('oracle 5', solve(*([[0, 0]], [], [0, 1])), [[[], True, 0]])
check('oracle 6', solve(*([[4, 3, 2, 1]], [3, 1, 0], [2])), [[[1, 3, 4], False, 3]])
check('oracle 7', solve(*([[1]], [0], [])), [[[1], True, 1]])
if N == 1: check('variant packet 1', solve(*[[[1, 0, 2, 0], [3, 0, 4, 5], [1, 0, 2, 0], [3, 0, 4, 5]], [2, 0], [1, 3]]), [[[2, 1], True, 2], [[4, 3], False, 2], [[2, 1], True, 2], [[4, 3], False, 2]])
if N == 2: check('variant packet 2', solve(*[[[1, 0, 2, 0], [3, 0, 4, 5], [1, 0, 2, 0], [3, 0, 4, 5], [1, 0, 2, 0], [3, 0, 4, 5]], [2, 0], [1, 3]]), [[[2, 1], True, 2], [[4, 3], False, 2], [[2, 1], True, 2], [[4, 3], False, 2], [[2, 1], True, 2], [[4, 3], False, 2]])
if N == 3: check('variant packet 3', solve(*[[[1, 0, 2, 0], [3, 0, 4, 5], [1, 0, 2, 0], [3, 0, 4, 5], [1, 0, 2, 0], [3, 0, 4, 5], [1, 0, 2, 0], [3, 0, 4, 5]], [2, 0], [1, 3]]), [[[2, 1], True, 2], [[4, 3], False, 2], [[2, 1], True, 2], [[4, 3], False, 2], [[2, 1], True, 2], [[4, 3], False, 2], [[2, 1], True, 2], [[4, 3], False, 2]])
if N == 4: check('variant packet 4', solve(*[[[1, 0, 2, 0], [3, 0, 4, 5], [1, 0, 2, 0], [3, 0, 4, 5], [1, 0, 2, 0], [3, 0, 4, 5], [1, 0, 2, 0], [3, 0, 4, 5], [1, 0, 2, 0], [3, 0, 4, 5]], [2, 0], [1, 3]]), [[[2, 1], True, 2], [[4, 3], False, 2], [[2, 1], True, 2], [[4, 3], False, 2], [[2, 1], True, 2], [[4, 3], False, 2], [[2, 1], True, 2], [[4, 3], False, 2], [[2, 1], True, 2], [[4, 3], False, 2]])
if N == 5: check('variant packet 5', solve(*[[[1, 0, 2, 0], [3, 0, 4, 5], [1, 0, 2, 0], [3, 0, 4, 5], [1, 0, 2, 0], [3, 0, 4, 5], [1, 0, 2, 0], [3, 0, 4, 5], [1, 0, 2, 0], [3, 0, 4, 5], [1, 0, 2, 0], [3, 0, 4, 5]], [2, 0], [1, 3]]), [[[2, 1], True, 2], [[4, 3], False, 2], [[2, 1], True, 2], [[4, 3], False, 2], [[2, 1], True, 2], [[4, 3], False, 2], [[2, 1], True, 2], [[4, 3], False, 2], [[2, 1], True, 2], [[4, 3], False, 2], [[2, 1], True, 2], [[4, 3], False, 2]])
print(json.dumps({"observations": observations, "passed": all(x["passed"] for x in observations)}, ensure_ascii=False))
raise SystemExit(0 if all(x["passed"] for x in observations) else 1)
Boundary fixtureActualExpectedOutcome
oracle 1[[[2, 1], True, 2], [[4, 3], False, 2]][[[2, 1], True, 2], [[4, 3], False, 2]]Passed
oracle 2[[[9, 8, 9], True, 3]][[[9, 8, 9], True, 3]]Passed
oracle 3[][]Passed
oracle 4[[[1], True, 1]][[[1], True, 1]]Passed
oracle 5[[[], True, 0]][[[], True, 0]]Passed
oracle 6[[[1, 3, 4], False, 3]][[[1, 3, 4], False, 3]]Passed
oracle 7[[[1], True, 1]][[[1], True, 1]]Passed
variant packet 1[[[2, 1], True, 2], [[4, 3], False, 2], [[2, 1], True, 2], [[4, 3], False, 2]][[[2, 1], True, 2], [[4, 3], False, 2], [[2, 1], True, 2], [[4, 3], False, 2]]Passed

SHA-256 / 9645ffb7d97e201b5c6308039e238f8c182d3af6ec2dc4aa9ee67632414e1743

Verification & scope

Stipulated finite model; no claim of hardware timing or full file-format conformance. This reproducer isolates one failure mechanism. Results cover the supplied fixtures. Variants within a family share a test contract and should remain grouped when constructing evaluation splits. Related mechanisms with a shared evaluation_group must also remain together; these controlled models are not independent production incidents.

Observations recorded using Python 3.12.14 at 2026-09-29T14:44:56.612156+00:00.

Case digest / c8e7a7ee3b2c0700d04db82661f56560c10da4f9e1b117cb928bb289c44c6f9a