{"abstract":"The companded wire complement is omitted.","category":"PCM sample encoding","checks":8,"contract":"Decode eight-bit mu-law codewords using complement, three-bit segment, four-bit mantissa and reconstruction bias132; return signed integer PCM amplitudes.","contract_signature":"codes","evaluation_group":"s3-pcm-mulaw-expansion","failed_approach":"Flipping only the sign leaves segment and mantissa inverted.","family":"s3-pcm-mulaw-expansion-wire-complement","id":"FA-48966","implementations":{"attempt":{"sha256":"7b1fe018df7c0659162195c9fb8008ec88e674230154fcc70e5a5323488f816c","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\n\nN = 1\nobservations = []\ndef solve(codes):\n    out=[]\n    for raw in codes:\n        code=raw^128\n        mantissa=code&15\n        exponent=(code>>4)&7\n        amplitude=((mantissa<<3)+132)<<exponent\n        amplitude-=132\n        out.append(-amplitude if code&128 else amplitude)\n    return out\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\ncheck('oracle 1', solve(*([255, 127, 0, 128],)), [0, 0, -32124, 32124])\ncheck('oracle 2', solve(*([254, 253, 252],)), [8, 16, 24])\ncheck('oracle 3', solve(*([240, 239, 224],)), [120, 132, 372])\ncheck('oracle 4', solve(*([16, 32, 64],)), [-15996, -7932, -1884])\ncheck('oracle 5', solve(*([],)), [])\ncheck('oracle 6', solve(*([175, 191, 207, 223],)), [4092, 1980, 924, 396])\ncheck('oracle 7', solve(*([1, 2, 126],)), [-31100, -30076, -8])\nif N == 1: check('variant packet 1', solve(*[[255, 127, 0, 128, 255, 127, 0, 128]]), [0, 0, -32124, 32124, 0, 0, -32124, 32124])\nif N == 2: check('variant packet 2', solve(*[[255, 127, 0, 128, 255, 127, 0, 128, 255, 127, 0, 128]]), [0, 0, -32124, 32124, 0, 0, -32124, 32124, 0, 0, -32124, 32124])\nif N == 3: check('variant packet 3', solve(*[[255, 127, 0, 128, 255, 127, 0, 128, 255, 127, 0, 128, 255, 127, 0, 128]]), [0, 0, -32124, 32124, 0, 0, -32124, 32124, 0, 0, -32124, 32124, 0, 0, -32124, 32124])\nif N == 4: check('variant packet 4', solve(*[[255, 127, 0, 128, 255, 127, 0, 128, 255, 127, 0, 128, 255, 127, 0, 128, 255, 127, 0, 128]]), [0, 0, -32124, 32124, 0, 0, -32124, 32124, 0, 0, -32124, 32124, 0, 0, -32124, 32124, 0, 0, -32124, 32124])\nif N == 5: check('variant packet 5', solve(*[[255, 127, 0, 128, 255, 127, 0, 128, 255, 127, 0, 128, 255, 127, 0, 128, 255, 127, 0, 128, 255, 127, 0, 128]]), [0, 0, -32124, 32124, 0, 0, -32124, 32124, 0, 0, -32124, 32124, 0, 0, -32124, 32124, 0, 0, -32124, 32124, 0, 0, -32124, 32124])\nprint(json.dumps({\"observations\": observations, \"passed\": all(x[\"passed\"] for x in observations)}, ensure_ascii=False))\nraise SystemExit(0 if all(x[\"passed\"] for x in observations) else 1)\n"},"broken":{"sha256":"46ee730ea8f42362037d3649b8c5fa7531ec86026a82347515e4386933ae451a","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\n\nN = 1\nobservations = []\ndef solve(codes):\n    out=[]\n    for raw in codes:\n        code=raw&255\n        mantissa=code&15\n        exponent=(code>>4)&7\n        amplitude=((mantissa<<3)+132)<<exponent\n        amplitude-=132\n        out.append(-amplitude if code&128 else amplitude)\n    return out\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\ncheck('oracle 1', solve(*([255, 127, 0, 128],)), [0, 0, -32124, 32124])\ncheck('oracle 2', solve(*([254, 253, 252],)), [8, 16, 24])\ncheck('oracle 3', solve(*([240, 239, 224],)), [120, 132, 372])\ncheck('oracle 4', solve(*([16, 32, 64],)), [-15996, -7932, -1884])\ncheck('oracle 5', solve(*([],)), [])\ncheck('oracle 6', solve(*([175, 191, 207, 223],)), [4092, 1980, 924, 396])\ncheck('oracle 7', solve(*([1, 2, 126],)), [-31100, -30076, -8])\nif N == 1: check('variant packet 1', solve(*[[255, 127, 0, 128, 255, 127, 0, 128]]), [0, 0, -32124, 32124, 0, 0, -32124, 32124])\nif N == 2: check('variant packet 2', solve(*[[255, 127, 0, 128, 255, 127, 0, 128, 255, 127, 0, 128]]), [0, 0, -32124, 32124, 0, 0, -32124, 32124, 0, 0, -32124, 32124])\nif N == 3: check('variant packet 3', solve(*[[255, 127, 0, 128, 255, 127, 0, 128, 255, 127, 0, 128, 255, 127, 0, 128]]), [0, 0, -32124, 32124, 0, 0, -32124, 32124, 0, 0, -32124, 32124, 0, 0, -32124, 32124])\nif N == 4: check('variant packet 4', solve(*[[255, 127, 0, 128, 255, 127, 0, 128, 255, 127, 0, 128, 255, 127, 0, 128, 255, 127, 0, 128]]), [0, 0, -32124, 32124, 0, 0, -32124, 32124, 0, 0, -32124, 32124, 0, 0, -32124, 32124, 0, 0, -32124, 32124])\nif N == 5: check('variant packet 5', solve(*[[255, 127, 0, 128, 255, 127, 0, 128, 255, 127, 0, 128, 255, 127, 0, 128, 255, 127, 0, 128, 255, 127, 0, 128]]), [0, 0, -32124, 32124, 0, 0, -32124, 32124, 0, 0, -32124, 32124, 0, 0, -32124, 32124, 0, 0, -32124, 32124, 0, 0, -32124, 32124])\nprint(json.dumps({\"observations\": observations, \"passed\": all(x[\"passed\"] for x in observations)}, ensure_ascii=False))\nraise SystemExit(0 if all(x[\"passed\"] for x in observations) else 1)\n"}},"limitations":"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.","method":"Deterministic executable model with adversarial boundary fixtures.","provenance":{"created_by":"Failure Map","dependencies":"Python standard library","family":"s3-pcm-mulaw-expansion-wire-complement","generated_at":"2026-09-29T14:44:55.696318+00:00","license":"CC0-1.0","python":"3.12.14","seed":1,"split":"open-access"},"relevance":"Offline PCM interchange uses these exact bounded packet and sample representation decisions.","root_cause":"The companded wire complement is omitted.","sha256":"006b8923ee4c7bec6742e2e8baacc736b49b853495d0bc71032c6f42b7bb9828","title":"Mulaw expansion: wire complement · case 01","variant":1,"variant_policy":"Five numbered records share a model and may reuse boundary fixtures.","verified":true,"visibility":"public","verification":{"attempt":{"elapsed_ms":39.044,"exit_code":1,"observations":[{"actual":[32124,-32124,0,0],"check":"oracle 1","expected":[0,0,-32124,32124],"passed":false},{"actual":[31100,30076,29052],"check":"oracle 2","expected":[8,16,24],"passed":false},{"actual":[16764,15996,8316],"check":"oracle 3","expected":[120,132,372],"passed":false},{"actual":[-132,-396,-1980],"check":"oracle 4","expected":[-15996,-7932,-1884],"passed":false},{"actual":[],"check":"oracle 5","expected":[],"passed":true},{"actual":[876,1884,3900,7932],"check":"oracle 6","expected":[4092,1980,924,396],"passed":false},{"actual":[-8,-16,-31100],"check":"oracle 7","expected":[-31100,-30076,-8],"passed":false},{"actual":[32124,-32124,0,0,32124,-32124,0,0],"check":"variant packet 1","expected":[0,0,-32124,32124,0,0,-32124,32124],"passed":false}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"oracle 1\", \"actual\": [32124, -32124, 0, 0], \"expected\": [0, 0, -32124, 32124], \"passed\": false}, {\"check\": \"oracle 2\", \"actual\": [31100, 30076, 29052], \"expected\": [8, 16, 24], \"passed\": false}, {\"check\": \"oracle 3\", \"actual\": [16764, 15996, 8316], \"expected\": [120, 132, 372], \"passed\": false}, {\"check\": \"oracle 4\", \"actual\": [-132, -396, -1980], \"expected\": [-15996, -7932, -1884], \"passed\": false}, {\"check\": \"oracle 5\", \"actual\": [], \"expected\": [], \"passed\": true}, {\"check\": \"oracle 6\", \"actual\": [876, 1884, 3900, 7932], \"expected\": [4092, 1980, 924, 396], \"passed\": false}, {\"check\": \"oracle 7\", \"actual\": [-8, -16, -31100], \"expected\": [-31100, -30076, -8], \"passed\": false}, {\"check\": \"variant packet 1\", \"actual\": [32124, -32124, 0, 0, 32124, -32124, 0, 0], \"expected\": [0, 0, -32124, 32124, 0, 0, -32124, 32124], \"passed\": false}], \"passed\": false}\n"},"broken":{"elapsed_ms":40.005,"exit_code":1,"observations":[{"actual":[-32124,32124,0,0],"check":"oracle 1","expected":[0,0,-32124,32124],"passed":false},{"actual":[-31100,-30076,-29052],"check":"oracle 2","expected":[8,16,24],"passed":false},{"actual":[-16764,-15996,-8316],"check":"oracle 3","expected":[120,132,372],"passed":false},{"actual":[132,396,1980],"check":"oracle 4","expected":[-15996,-7932,-1884],"passed":false},{"actual":[],"check":"oracle 5","expected":[],"passed":true},{"actual":[-876,-1884,-3900,-7932],"check":"oracle 6","expected":[4092,1980,924,396],"passed":false},{"actual":[8,16,31100],"check":"oracle 7","expected":[-31100,-30076,-8],"passed":false},{"actual":[-32124,32124,0,0,-32124,32124,0,0],"check":"variant packet 1","expected":[0,0,-32124,32124,0,0,-32124,32124],"passed":false}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"oracle 1\", \"actual\": [-32124, 32124, 0, 0], \"expected\": [0, 0, -32124, 32124], \"passed\": false}, {\"check\": \"oracle 2\", \"actual\": [-31100, -30076, -29052], \"expected\": [8, 16, 24], \"passed\": false}, {\"check\": \"oracle 3\", \"actual\": [-16764, -15996, -8316], \"expected\": [120, 132, 372], \"passed\": false}, {\"check\": \"oracle 4\", \"actual\": [132, 396, 1980], \"expected\": [-15996, -7932, -1884], \"passed\": false}, {\"check\": \"oracle 5\", \"actual\": [], \"expected\": [], \"passed\": true}, {\"check\": \"oracle 6\", \"actual\": [-876, -1884, -3900, -7932], \"expected\": [4092, 1980, 924, 396], \"passed\": false}, {\"check\": \"oracle 7\", \"actual\": [8, 16, 31100], \"expected\": [-31100, -30076, -8], \"passed\": false}, {\"check\": \"variant packet 1\", \"actual\": [-32124, 32124, 0, 0, -32124, 32124, 0, 0], \"expected\": [0, 0, -32124, 32124, 0, 0, -32124, 32124], \"passed\": false}], \"passed\": false}\n"}},"member_only":{"stages":["fixed"],"fields":["implementations.fixed","verification.fixed","harness","repair"],"note":"The verified repair, its recorded checks, the repair description, and the scoring harness are available to members."}}