{"abstract":"Unspecified PCM positions are initialized with the wrong silence code.","category":"PCM sample encoding","checks":8,"contract":"Reconstruct a sparse PCM packet into a fixed sample span using explicit silence, ignore out-of-range events and apply duplicate positions in arrival order.","evaluation_group":"s3-pcm-pcm-sparse-impulses","failed_approach":"Unknown markers are not the stipulated valid digital silence.","family":"s3-pcm-pcm-sparse-impulses-default-code","id":"FA-49416","implementations":{"attempt":{"sha256":"adf3321962e65e850abac15cd7e5fc4344d2bfae9b0ce8db73d5a603e22ea4c9","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\n\nN = 1\nobservations = []\ndef solve(events, length, zero):\n    out=[None]*length\n    for index,value in events:\n        if 0<=index<length:\n            out[index]=value\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, 130], [3, 129]], 4, 128)), [130, 128, 128, 129])\ncheck('oracle 2', solve(*([[1, 5], [1, 7]], 3, 0)), [0, 7, 0])\ncheck('oracle 3', solve(*([[-1, 3], [1, 4]], 3, 0)), [0, 4, 0])\ncheck('oracle 4', solve(*([], 3, 128)), [128, 128, 128])\ncheck('oracle 5', solve(*([[3, 7], [0, 2]], 3, 0)), [2, 0, 0])\ncheck('oracle 6', solve(*([], 0, 128)), [])\ncheck('oracle 7', solve(*([[0, 128], [0, 129]], 1, 128)), [129])\nif N == 1: check('variant packet 1', solve(*[[[0, 130], [3, 129], [0, 130], [3, 129]], 5, 128]), [130, 128, 128, 129, 128])\nif N == 2: check('variant packet 2', solve(*[[[0, 130], [3, 129], [0, 130], [3, 129], [0, 130], [3, 129]], 6, 128]), [130, 128, 128, 129, 128, 128])\nif N == 3: check('variant packet 3', solve(*[[[0, 130], [3, 129], [0, 130], [3, 129], [0, 130], [3, 129], [0, 130], [3, 129]], 7, 128]), [130, 128, 128, 129, 128, 128, 128])\nif N == 4: check('variant packet 4', solve(*[[[0, 130], [3, 129], [0, 130], [3, 129], [0, 130], [3, 129], [0, 130], [3, 129], [0, 130], [3, 129]], 8, 128]), [130, 128, 128, 129, 128, 128, 128, 128])\nif N == 5: check('variant packet 5', solve(*[[[0, 130], [3, 129], [0, 130], [3, 129], [0, 130], [3, 129], [0, 130], [3, 129], [0, 130], [3, 129], [0, 130], [3, 129]], 9, 128]), [130, 128, 128, 129, 128, 128, 128, 128, 128])\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":"516c095119c133a325f0a1f1c62d858fa9c17464a55633f449497b0e10c17307","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\n\nN = 1\nobservations = []\ndef solve(events, length, zero):\n    out=[0]*length\n    for index,value in events:\n        if 0<=index<length:\n            out[index]=value\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, 130], [3, 129]], 4, 128)), [130, 128, 128, 129])\ncheck('oracle 2', solve(*([[1, 5], [1, 7]], 3, 0)), [0, 7, 0])\ncheck('oracle 3', solve(*([[-1, 3], [1, 4]], 3, 0)), [0, 4, 0])\ncheck('oracle 4', solve(*([], 3, 128)), [128, 128, 128])\ncheck('oracle 5', solve(*([[3, 7], [0, 2]], 3, 0)), [2, 0, 0])\ncheck('oracle 6', solve(*([], 0, 128)), [])\ncheck('oracle 7', solve(*([[0, 128], [0, 129]], 1, 128)), [129])\nif N == 1: check('variant packet 1', solve(*[[[0, 130], [3, 129], [0, 130], [3, 129]], 5, 128]), [130, 128, 128, 129, 128])\nif N == 2: check('variant packet 2', solve(*[[[0, 130], [3, 129], [0, 130], [3, 129], [0, 130], [3, 129]], 6, 128]), [130, 128, 128, 129, 128, 128])\nif N == 3: check('variant packet 3', solve(*[[[0, 130], [3, 129], [0, 130], [3, 129], [0, 130], [3, 129], [0, 130], [3, 129]], 7, 128]), [130, 128, 128, 129, 128, 128, 128])\nif N == 4: check('variant packet 4', solve(*[[[0, 130], [3, 129], [0, 130], [3, 129], [0, 130], [3, 129], [0, 130], [3, 129], [0, 130], [3, 129]], 8, 128]), [130, 128, 128, 129, 128, 128, 128, 128])\nif N == 5: check('variant packet 5', solve(*[[[0, 130], [3, 129], [0, 130], [3, 129], [0, 130], [3, 129], [0, 130], [3, 129], [0, 130], [3, 129], [0, 130], [3, 129]], 9, 128]), [130, 128, 128, 129, 128, 128, 128, 128, 128])\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"},"fixed":{"sha256":"d4d329f9b7f97e81ef35b06cea7cef9c1050f94f1d687a1bc126e5f206eaf9b3","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\n\nN = 1\nobservations = []\ndef solve(events, length, zero):\n    out=[zero]*length\n    for index,value in events:\n        if 0<=index<length:\n            out[index]=value\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, 130], [3, 129]], 4, 128)), [130, 128, 128, 129])\ncheck('oracle 2', solve(*([[1, 5], [1, 7]], 3, 0)), [0, 7, 0])\ncheck('oracle 3', solve(*([[-1, 3], [1, 4]], 3, 0)), [0, 4, 0])\ncheck('oracle 4', solve(*([], 3, 128)), [128, 128, 128])\ncheck('oracle 5', solve(*([[3, 7], [0, 2]], 3, 0)), [2, 0, 0])\ncheck('oracle 6', solve(*([], 0, 128)), [])\ncheck('oracle 7', solve(*([[0, 128], [0, 129]], 1, 128)), [129])\nif N == 1: check('variant packet 1', solve(*[[[0, 130], [3, 129], [0, 130], [3, 129]], 5, 128]), [130, 128, 128, 129, 128])\nif N == 2: check('variant packet 2', solve(*[[[0, 130], [3, 129], [0, 130], [3, 129], [0, 130], [3, 129]], 6, 128]), [130, 128, 128, 129, 128, 128])\nif N == 3: check('variant packet 3', solve(*[[[0, 130], [3, 129], [0, 130], [3, 129], [0, 130], [3, 129], [0, 130], [3, 129]], 7, 128]), [130, 128, 128, 129, 128, 128, 128])\nif N == 4: check('variant packet 4', solve(*[[[0, 130], [3, 129], [0, 130], [3, 129], [0, 130], [3, 129], [0, 130], [3, 129], [0, 130], [3, 129]], 8, 128]), [130, 128, 128, 129, 128, 128, 128, 128])\nif N == 5: check('variant packet 5', solve(*[[[0, 130], [3, 129], [0, 130], [3, 129], [0, 130], [3, 129], [0, 130], [3, 129], [0, 130], [3, 129], [0, 130], [3, 129]], 9, 128]), [130, 128, 128, 129, 128, 128, 128, 128, 128])\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-sparse-impulses-default-code","generated_at":"2026-09-29T14:44:59.779878+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.","repair":"Use the stated conversion contract at default code.","root_cause":"Unspecified PCM positions are initialized with the wrong silence code.","sha256":"3a89fd202a84870e8c5a3f2c26de55cfa4cc31d7993f8db1c32e64b9f1081c8a","title":"Pcm sparse impulses: default code · case 01","variant":1,"variant_policy":"Five numbered records share a model and may reuse boundary fixtures.","verification":{"attempt":{"elapsed_ms":40.1,"exit_code":1,"observations":[{"actual":[130,null,null,129],"check":"oracle 1","expected":[130,128,128,129],"passed":false},{"actual":[null,7,null],"check":"oracle 2","expected":[0,7,0],"passed":false},{"actual":[null,4,null],"check":"oracle 3","expected":[0,4,0],"passed":false},{"actual":[null,null,null],"check":"oracle 4","expected":[128,128,128],"passed":false},{"actual":[2,null,null],"check":"oracle 5","expected":[2,0,0],"passed":false},{"actual":[],"check":"oracle 6","expected":[],"passed":true},{"actual":[129],"check":"oracle 7","expected":[129],"passed":true},{"actual":[130,null,null,129,null],"check":"variant packet 1","expected":[130,128,128,129,128],"passed":false}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"oracle 1\", \"actual\": [130, null, null, 129], \"expected\": [130, 128, 128, 129], \"passed\": false}, {\"check\": \"oracle 2\", \"actual\": [null, 7, null], \"expected\": [0, 7, 0], \"passed\": false}, {\"check\": \"oracle 3\", \"actual\": [null, 4, null], \"expected\": [0, 4, 0], \"passed\": false}, {\"check\": \"oracle 4\", \"actual\": [null, null, null], \"expected\": [128, 128, 128], \"passed\": false}, {\"check\": \"oracle 5\", \"actual\": [2, null, null], \"expected\": [2, 0, 0], \"passed\": false}, {\"check\": \"oracle 6\", \"actual\": [], \"expected\": [], \"passed\": true}, {\"check\": \"oracle 7\", \"actual\": [129], \"expected\": [129], \"passed\": true}, {\"check\": \"variant packet 1\", \"actual\": [130, null, null, 129, null], \"expected\": [130, 128, 128, 129, 128], \"passed\": false}], \"passed\": false}\n"},"broken":{"elapsed_ms":40.016,"exit_code":1,"observations":[{"actual":[130,0,0,129],"check":"oracle 1","expected":[130,128,128,129],"passed":false},{"actual":[0,7,0],"check":"oracle 2","expected":[0,7,0],"passed":true},{"actual":[0,4,0],"check":"oracle 3","expected":[0,4,0],"passed":true},{"actual":[0,0,0],"check":"oracle 4","expected":[128,128,128],"passed":false},{"actual":[2,0,0],"check":"oracle 5","expected":[2,0,0],"passed":true},{"actual":[],"check":"oracle 6","expected":[],"passed":true},{"actual":[129],"check":"oracle 7","expected":[129],"passed":true},{"actual":[130,0,0,129,0],"check":"variant packet 1","expected":[130,128,128,129,128],"passed":false}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"oracle 1\", \"actual\": [130, 0, 0, 129], \"expected\": [130, 128, 128, 129], \"passed\": false}, {\"check\": \"oracle 2\", \"actual\": [0, 7, 0], \"expected\": [0, 7, 0], \"passed\": true}, {\"check\": \"oracle 3\", \"actual\": [0, 4, 0], \"expected\": [0, 4, 0], \"passed\": true}, {\"check\": \"oracle 4\", \"actual\": [0, 0, 0], \"expected\": [128, 128, 128], \"passed\": false}, {\"check\": \"oracle 5\", \"actual\": [2, 0, 0], \"expected\": [2, 0, 0], \"passed\": true}, {\"check\": \"oracle 6\", \"actual\": [], \"expected\": [], \"passed\": true}, {\"check\": \"oracle 7\", \"actual\": [129], \"expected\": [129], \"passed\": true}, {\"check\": \"variant packet 1\", \"actual\": [130, 0, 0, 129, 0], \"expected\": [130, 128, 128, 129, 128], \"passed\": false}], \"passed\": false}\n"},"fixed":{"elapsed_ms":37.385,"exit_code":0,"observations":[{"actual":[130,128,128,129],"check":"oracle 1","expected":[130,128,128,129],"passed":true},{"actual":[0,7,0],"check":"oracle 2","expected":[0,7,0],"passed":true},{"actual":[0,4,0],"check":"oracle 3","expected":[0,4,0],"passed":true},{"actual":[128,128,128],"check":"oracle 4","expected":[128,128,128],"passed":true},{"actual":[2,0,0],"check":"oracle 5","expected":[2,0,0],"passed":true},{"actual":[],"check":"oracle 6","expected":[],"passed":true},{"actual":[129],"check":"oracle 7","expected":[129],"passed":true},{"actual":[130,128,128,129,128],"check":"variant packet 1","expected":[130,128,128,129,128],"passed":true}],"passed":true,"stderr":"","stdout":"{\"observations\": [{\"check\": \"oracle 1\", \"actual\": [130, 128, 128, 129], \"expected\": [130, 128, 128, 129], \"passed\": true}, {\"check\": \"oracle 2\", \"actual\": [0, 7, 0], \"expected\": [0, 7, 0], \"passed\": true}, {\"check\": \"oracle 3\", \"actual\": [0, 4, 0], \"expected\": [0, 4, 0], \"passed\": true}, {\"check\": \"oracle 4\", \"actual\": [128, 128, 128], \"expected\": [128, 128, 128], \"passed\": true}, {\"check\": \"oracle 5\", \"actual\": [2, 0, 0], \"expected\": [2, 0, 0], \"passed\": true}, {\"check\": \"oracle 6\", \"actual\": [], \"expected\": [], \"passed\": true}, {\"check\": \"oracle 7\", \"actual\": [129], \"expected\": [129], \"passed\": true}, {\"check\": \"variant packet 1\", \"actual\": [130, 128, 128, 129, 128], \"expected\": [130, 128, 128, 129, 128], \"passed\": true}], \"passed\": true}\n"}},"verified":true,"visibility":"public"}