{"abstract":"Invalid PCM codes become plausible silence amplitudes.","category":"PCM sample encoding","checks":8,"contract":"Decode an explicitly calibrated nonlinear PCM code table relative to its designated zero entry; invalid indices return null rather than a plausible sample.","contract_signature":"codes, table, zero_index","evaluation_group":"s3-pcm-pcm-nonlinear-reconstruction-table","failed_approach":"Returning the calibration zero level hides invalidity too.","family":"s3-pcm-pcm-nonlinear-reconstruction-table-invalid-marker","id":"FA-49906","implementations":{"attempt":{"sha256":"e35fedfbee001ac56d6a1a46052200161f67d4f2f4557d39382c32d332a5a028","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\n\nN = 1\nobservations = []\ndef solve(codes, table, zero_index):\n    out=[]\n    for code in codes:\n        if code<0 or code>=len(table):\n            out.append(table[zero_index])\n            continue\n        amplitude=table[code]-table[zero_index]\n        out.append(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(*([0, 1, 2, 3], [-9, -2, 4, 15], 1)), [-7, 0, 6, 17])\ncheck('oracle 2', solve(*([-1, 0, 3], [1, 3, 9], 0)), [None, 0, None])\ncheck('oracle 3', solve(*([0], [-5], 0)), [0])\ncheck('oracle 4', solve(*([], [-3, 2], 1)), [])\ncheck('oracle 5', solve(*([1, 2], [0, 10, 11], 1)), [0, 1])\ncheck('oracle 6', solve(*([0, 2, 4], [-8, -3, 0, 3, 8], 2)), [-8, 0, 8])\ncheck('oracle 7', solve(*([0, -2, 2], [4, 8, 12], 1)), [-4, None, 4])\nif N == 1: check('variant packet 1', solve(*[[0, 1, 2, 3, 0, 1, 2, 3], [-9, -2, 4, 15], 1]), [-7, 0, 6, 17, -7, 0, 6, 17])\nif N == 2: check('variant packet 2', solve(*[[0, 1, 2, 3, 0, 1, 2, 3, 0, 1, 2, 3], [-9, -2, 4, 15], 1]), [-7, 0, 6, 17, -7, 0, 6, 17, -7, 0, 6, 17])\nif N == 3: check('variant packet 3', solve(*[[0, 1, 2, 3, 0, 1, 2, 3, 0, 1, 2, 3, 0, 1, 2, 3], [-9, -2, 4, 15], 1]), [-7, 0, 6, 17, -7, 0, 6, 17, -7, 0, 6, 17, -7, 0, 6, 17])\nif N == 4: check('variant packet 4', solve(*[[0, 1, 2, 3, 0, 1, 2, 3, 0, 1, 2, 3, 0, 1, 2, 3, 0, 1, 2, 3], [-9, -2, 4, 15], 1]), [-7, 0, 6, 17, -7, 0, 6, 17, -7, 0, 6, 17, -7, 0, 6, 17, -7, 0, 6, 17])\nif N == 5: check('variant packet 5', solve(*[[0, 1, 2, 3, 0, 1, 2, 3, 0, 1, 2, 3, 0, 1, 2, 3, 0, 1, 2, 3, 0, 1, 2, 3], [-9, -2, 4, 15], 1]), [-7, 0, 6, 17, -7, 0, 6, 17, -7, 0, 6, 17, -7, 0, 6, 17, -7, 0, 6, 17, -7, 0, 6, 17])\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":"0476b061c2ee9aa4221390e6e45e4061445ab101b0112433cf046ddf8fd76363","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\n\nN = 1\nobservations = []\ndef solve(codes, table, zero_index):\n    out=[]\n    for code in codes:\n        if code<0 or code>=len(table):\n            out.append(0)\n            continue\n        amplitude=table[code]-table[zero_index]\n        out.append(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(*([0, 1, 2, 3], [-9, -2, 4, 15], 1)), [-7, 0, 6, 17])\ncheck('oracle 2', solve(*([-1, 0, 3], [1, 3, 9], 0)), [None, 0, None])\ncheck('oracle 3', solve(*([0], [-5], 0)), [0])\ncheck('oracle 4', solve(*([], [-3, 2], 1)), [])\ncheck('oracle 5', solve(*([1, 2], [0, 10, 11], 1)), [0, 1])\ncheck('oracle 6', solve(*([0, 2, 4], [-8, -3, 0, 3, 8], 2)), [-8, 0, 8])\ncheck('oracle 7', solve(*([0, -2, 2], [4, 8, 12], 1)), [-4, None, 4])\nif N == 1: check('variant packet 1', solve(*[[0, 1, 2, 3, 0, 1, 2, 3], [-9, -2, 4, 15], 1]), [-7, 0, 6, 17, -7, 0, 6, 17])\nif N == 2: check('variant packet 2', solve(*[[0, 1, 2, 3, 0, 1, 2, 3, 0, 1, 2, 3], [-9, -2, 4, 15], 1]), [-7, 0, 6, 17, -7, 0, 6, 17, -7, 0, 6, 17])\nif N == 3: check('variant packet 3', solve(*[[0, 1, 2, 3, 0, 1, 2, 3, 0, 1, 2, 3, 0, 1, 2, 3], [-9, -2, 4, 15], 1]), [-7, 0, 6, 17, -7, 0, 6, 17, -7, 0, 6, 17, -7, 0, 6, 17])\nif N == 4: check('variant packet 4', solve(*[[0, 1, 2, 3, 0, 1, 2, 3, 0, 1, 2, 3, 0, 1, 2, 3, 0, 1, 2, 3], [-9, -2, 4, 15], 1]), [-7, 0, 6, 17, -7, 0, 6, 17, -7, 0, 6, 17, -7, 0, 6, 17, -7, 0, 6, 17])\nif N == 5: check('variant packet 5', solve(*[[0, 1, 2, 3, 0, 1, 2, 3, 0, 1, 2, 3, 0, 1, 2, 3, 0, 1, 2, 3, 0, 1, 2, 3], [-9, -2, 4, 15], 1]), [-7, 0, 6, 17, -7, 0, 6, 17, -7, 0, 6, 17, -7, 0, 6, 17, -7, 0, 6, 17, -7, 0, 6, 17])\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-pcm-nonlinear-reconstruction-table-invalid-marker","generated_at":"2026-09-29T14:45:04.335912+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":"Invalid PCM codes become plausible silence amplitudes.","sha256":"ab11097d22181dcce43f954ec9e962a636933d89609acdaad2cd25174d0cd89c","title":"Pcm nonlinear reconstruction table: invalid marker · 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":36.575,"exit_code":1,"observations":[{"actual":[-7,0,6,17],"check":"oracle 1","expected":[-7,0,6,17],"passed":true},{"actual":[1,0,1],"check":"oracle 2","expected":[null,0,null],"passed":false},{"actual":[0],"check":"oracle 3","expected":[0],"passed":true},{"actual":[],"check":"oracle 4","expected":[],"passed":true},{"actual":[0,1],"check":"oracle 5","expected":[0,1],"passed":true},{"actual":[-8,0,8],"check":"oracle 6","expected":[-8,0,8],"passed":true},{"actual":[-4,8,4],"check":"oracle 7","expected":[-4,null,4],"passed":false},{"actual":[-7,0,6,17,-7,0,6,17],"check":"variant packet 1","expected":[-7,0,6,17,-7,0,6,17],"passed":true}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"oracle 1\", \"actual\": [-7, 0, 6, 17], \"expected\": [-7, 0, 6, 17], \"passed\": true}, {\"check\": \"oracle 2\", \"actual\": [1, 0, 1], \"expected\": [null, 0, null], \"passed\": false}, {\"check\": \"oracle 3\", \"actual\": [0], \"expected\": [0], \"passed\": true}, {\"check\": \"oracle 4\", \"actual\": [], \"expected\": [], \"passed\": true}, {\"check\": \"oracle 5\", \"actual\": [0, 1], \"expected\": [0, 1], \"passed\": true}, {\"check\": \"oracle 6\", \"actual\": [-8, 0, 8], \"expected\": [-8, 0, 8], \"passed\": true}, {\"check\": \"oracle 7\", \"actual\": [-4, 8, 4], \"expected\": [-4, null, 4], \"passed\": false}, {\"check\": \"variant packet 1\", \"actual\": [-7, 0, 6, 17, -7, 0, 6, 17], \"expected\": [-7, 0, 6, 17, -7, 0, 6, 17], \"passed\": true}], \"passed\": false}\n"},"broken":{"elapsed_ms":40.585,"exit_code":1,"observations":[{"actual":[-7,0,6,17],"check":"oracle 1","expected":[-7,0,6,17],"passed":true},{"actual":[0,0,0],"check":"oracle 2","expected":[null,0,null],"passed":false},{"actual":[0],"check":"oracle 3","expected":[0],"passed":true},{"actual":[],"check":"oracle 4","expected":[],"passed":true},{"actual":[0,1],"check":"oracle 5","expected":[0,1],"passed":true},{"actual":[-8,0,8],"check":"oracle 6","expected":[-8,0,8],"passed":true},{"actual":[-4,0,4],"check":"oracle 7","expected":[-4,null,4],"passed":false},{"actual":[-7,0,6,17,-7,0,6,17],"check":"variant packet 1","expected":[-7,0,6,17,-7,0,6,17],"passed":true}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"oracle 1\", \"actual\": [-7, 0, 6, 17], \"expected\": [-7, 0, 6, 17], \"passed\": true}, {\"check\": \"oracle 2\", \"actual\": [0, 0, 0], \"expected\": [null, 0, null], \"passed\": false}, {\"check\": \"oracle 3\", \"actual\": [0], \"expected\": [0], \"passed\": true}, {\"check\": \"oracle 4\", \"actual\": [], \"expected\": [], \"passed\": true}, {\"check\": \"oracle 5\", \"actual\": [0, 1], \"expected\": [0, 1], \"passed\": true}, {\"check\": \"oracle 6\", \"actual\": [-8, 0, 8], \"expected\": [-8, 0, 8], \"passed\": true}, {\"check\": \"oracle 7\", \"actual\": [-4, 0, 4], \"expected\": [-4, null, 4], \"passed\": false}, {\"check\": \"variant packet 1\", \"actual\": [-7, 0, 6, 17, -7, 0, 6, 17], \"expected\": [-7, 0, 6, 17, -7, 0, 6, 17], \"passed\": true}], \"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."}}