{"abstract":"Repeated sentinel chunks never advance their matching size entry.","category":"PCM sample encoding","checks":8,"contract":"Resolve sentinel PCM chunk lengths from per-tag occurrence-ordered extended size tables, preserving ordinary sizes and null for missing table entries.","evaluation_group":"s3-pcm-rf64-pcm-size-table","failed_approach":"Advancing twice skips the next declared length.","family":"s3-pcm-rf64-pcm-size-table-table-advance","id":"FA-49586","implementations":{"attempt":{"sha256":"31f660cfb91e7fa5bf8646d833d35a5fd1536ae393af040119eb3f27d3a9136c","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\n\nN = 1\nobservations = []\ndef solve(chunks, extended_sizes, sentinel):\n    used={}\n    out=[]\n    for tag,size in chunks:\n        if size==sentinel:\n            ordinal=used.get(tag,0)\n            matches=extended_sizes.get(tag,[])\n            resolved=matches[ordinal] if ordinal<len(matches) else None\n            used[tag]=ordinal+2\n        else:\n            resolved=size\n        out.append([tag,resolved])\n    return out\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\ncheck('oracle 1', solve(*([['data', 99], ['data', 99]], {'data': [4, 8]}, 99)), [['data', 4], ['data', 8]])\ncheck('oracle 2', solve(*([['data', 4], ['data', 99]], {'data': [8]}, 99)), [['data', 4], ['data', 8]])\ncheck('oracle 3', solve(*([['data', 99], ['JUNK', 99], ['data', 99]], {'data': [4, 8], 'JUNK': [3]}, 99)), [['data', 4], ['JUNK', 3], ['data', 8]])\ncheck('oracle 4', solve(*([], {}, 99)), [])\ncheck('oracle 5', solve(*([['data', 99]], {}, 99)), [['data', None]])\ncheck('oracle 6', solve(*([['data', 99], ['data', 99]], {'data': [5]}, 99)), [['data', 5], ['data', None]])\ncheck('oracle 7', solve(*([['data', 98]], {'data': [10]}, 99)), [['data', 98]])\nif N == 1: check('variant packet 1', solve(*[[['data', 99], ['data', 99], ['data', 99], ['data', 99]], {'data': [4, 8]}, 99]), [['data', 4], ['data', 8], ['data', None], ['data', None]])\nif N == 2: check('variant packet 2', solve(*[[['data', 99], ['data', 99], ['data', 99], ['data', 99], ['data', 99], ['data', 99]], {'data': [4, 8]}, 99]), [['data', 4], ['data', 8], ['data', None], ['data', None], ['data', None], ['data', None]])\nif N == 3: check('variant packet 3', solve(*[[['data', 99], ['data', 99], ['data', 99], ['data', 99], ['data', 99], ['data', 99], ['data', 99], ['data', 99]], {'data': [4, 8]}, 99]), [['data', 4], ['data', 8], ['data', None], ['data', None], ['data', None], ['data', None], ['data', None], ['data', None]])\nif N == 4: check('variant packet 4', solve(*[[['data', 99], ['data', 99], ['data', 99], ['data', 99], ['data', 99], ['data', 99], ['data', 99], ['data', 99], ['data', 99], ['data', 99]], {'data': [4, 8]}, 99]), [['data', 4], ['data', 8], ['data', None], ['data', None], ['data', None], ['data', None], ['data', None], ['data', None], ['data', None], ['data', None]])\nif N == 5: check('variant packet 5', solve(*[[['data', 99], ['data', 99], ['data', 99], ['data', 99], ['data', 99], ['data', 99], ['data', 99], ['data', 99], ['data', 99], ['data', 99], ['data', 99], ['data', 99]], {'data': [4, 8]}, 99]), [['data', 4], ['data', 8], ['data', None], ['data', None], ['data', None], ['data', None], ['data', None], ['data', None], ['data', None], ['data', None], ['data', None], ['data', None]])\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":"272f5212dc88149ffed3d9f7447cf9545931611621d9a7b7fa309a847cf31e13","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\n\nN = 1\nobservations = []\ndef solve(chunks, extended_sizes, sentinel):\n    used={}\n    out=[]\n    for tag,size in chunks:\n        if size==sentinel:\n            ordinal=used.get(tag,0)\n            matches=extended_sizes.get(tag,[])\n            resolved=matches[ordinal] if ordinal<len(matches) else None\n            used[tag]=ordinal\n        else:\n            resolved=size\n        out.append([tag,resolved])\n    return out\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\ncheck('oracle 1', solve(*([['data', 99], ['data', 99]], {'data': [4, 8]}, 99)), [['data', 4], ['data', 8]])\ncheck('oracle 2', solve(*([['data', 4], ['data', 99]], {'data': [8]}, 99)), [['data', 4], ['data', 8]])\ncheck('oracle 3', solve(*([['data', 99], ['JUNK', 99], ['data', 99]], {'data': [4, 8], 'JUNK': [3]}, 99)), [['data', 4], ['JUNK', 3], ['data', 8]])\ncheck('oracle 4', solve(*([], {}, 99)), [])\ncheck('oracle 5', solve(*([['data', 99]], {}, 99)), [['data', None]])\ncheck('oracle 6', solve(*([['data', 99], ['data', 99]], {'data': [5]}, 99)), [['data', 5], ['data', None]])\ncheck('oracle 7', solve(*([['data', 98]], {'data': [10]}, 99)), [['data', 98]])\nif N == 1: check('variant packet 1', solve(*[[['data', 99], ['data', 99], ['data', 99], ['data', 99]], {'data': [4, 8]}, 99]), [['data', 4], ['data', 8], ['data', None], ['data', None]])\nif N == 2: check('variant packet 2', solve(*[[['data', 99], ['data', 99], ['data', 99], ['data', 99], ['data', 99], ['data', 99]], {'data': [4, 8]}, 99]), [['data', 4], ['data', 8], ['data', None], ['data', None], ['data', None], ['data', None]])\nif N == 3: check('variant packet 3', solve(*[[['data', 99], ['data', 99], ['data', 99], ['data', 99], ['data', 99], ['data', 99], ['data', 99], ['data', 99]], {'data': [4, 8]}, 99]), [['data', 4], ['data', 8], ['data', None], ['data', None], ['data', None], ['data', None], ['data', None], ['data', None]])\nif N == 4: check('variant packet 4', solve(*[[['data', 99], ['data', 99], ['data', 99], ['data', 99], ['data', 99], ['data', 99], ['data', 99], ['data', 99], ['data', 99], ['data', 99]], {'data': [4, 8]}, 99]), [['data', 4], ['data', 8], ['data', None], ['data', None], ['data', None], ['data', None], ['data', None], ['data', None], ['data', None], ['data', None]])\nif N == 5: check('variant packet 5', solve(*[[['data', 99], ['data', 99], ['data', 99], ['data', 99], ['data', 99], ['data', 99], ['data', 99], ['data', 99], ['data', 99], ['data', 99], ['data', 99], ['data', 99]], {'data': [4, 8]}, 99]), [['data', 4], ['data', 8], ['data', None], ['data', None], ['data', None], ['data', None], ['data', None], ['data', None], ['data', None], ['data', None], ['data', None], ['data', None]])\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":"728d06433a577a7d64523e6e570094e730b94bed045d0fd93c5f223e89ca7334","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\n\nN = 1\nobservations = []\ndef solve(chunks, extended_sizes, sentinel):\n    used={}\n    out=[]\n    for tag,size in chunks:\n        if size==sentinel:\n            ordinal=used.get(tag,0)\n            matches=extended_sizes.get(tag,[])\n            resolved=matches[ordinal] if ordinal<len(matches) else None\n            used[tag]=ordinal+1\n        else:\n            resolved=size\n        out.append([tag,resolved])\n    return out\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\ncheck('oracle 1', solve(*([['data', 99], ['data', 99]], {'data': [4, 8]}, 99)), [['data', 4], ['data', 8]])\ncheck('oracle 2', solve(*([['data', 4], ['data', 99]], {'data': [8]}, 99)), [['data', 4], ['data', 8]])\ncheck('oracle 3', solve(*([['data', 99], ['JUNK', 99], ['data', 99]], {'data': [4, 8], 'JUNK': [3]}, 99)), [['data', 4], ['JUNK', 3], ['data', 8]])\ncheck('oracle 4', solve(*([], {}, 99)), [])\ncheck('oracle 5', solve(*([['data', 99]], {}, 99)), [['data', None]])\ncheck('oracle 6', solve(*([['data', 99], ['data', 99]], {'data': [5]}, 99)), [['data', 5], ['data', None]])\ncheck('oracle 7', solve(*([['data', 98]], {'data': [10]}, 99)), [['data', 98]])\nif N == 1: check('variant packet 1', solve(*[[['data', 99], ['data', 99], ['data', 99], ['data', 99]], {'data': [4, 8]}, 99]), [['data', 4], ['data', 8], ['data', None], ['data', None]])\nif N == 2: check('variant packet 2', solve(*[[['data', 99], ['data', 99], ['data', 99], ['data', 99], ['data', 99], ['data', 99]], {'data': [4, 8]}, 99]), [['data', 4], ['data', 8], ['data', None], ['data', None], ['data', None], ['data', None]])\nif N == 3: check('variant packet 3', solve(*[[['data', 99], ['data', 99], ['data', 99], ['data', 99], ['data', 99], ['data', 99], ['data', 99], ['data', 99]], {'data': [4, 8]}, 99]), [['data', 4], ['data', 8], ['data', None], ['data', None], ['data', None], ['data', None], ['data', None], ['data', None]])\nif N == 4: check('variant packet 4', solve(*[[['data', 99], ['data', 99], ['data', 99], ['data', 99], ['data', 99], ['data', 99], ['data', 99], ['data', 99], ['data', 99], ['data', 99]], {'data': [4, 8]}, 99]), [['data', 4], ['data', 8], ['data', None], ['data', None], ['data', None], ['data', None], ['data', None], ['data', None], ['data', None], ['data', None]])\nif N == 5: check('variant packet 5', solve(*[[['data', 99], ['data', 99], ['data', 99], ['data', 99], ['data', 99], ['data', 99], ['data', 99], ['data', 99], ['data', 99], ['data', 99], ['data', 99], ['data', 99]], {'data': [4, 8]}, 99]), [['data', 4], ['data', 8], ['data', None], ['data', None], ['data', None], ['data', None], ['data', None], ['data', None], ['data', None], ['data', None], ['data', None], ['data', None]])\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-rf64-pcm-size-table-table-advance","generated_at":"2026-09-29T14:45:01.313818+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 table advance.","root_cause":"Repeated sentinel chunks never advance their matching size entry.","sha256":"e5f5e86bf7e2c6c38b9df62c1d8e5ac6fab4e0d95ef3c8a6c9559fdb953885a8","title":"Rf64 pcm size table: table advance · case 01","variant":1,"variant_policy":"Five numbered records share a model and may reuse boundary fixtures.","verification":{"attempt":{"elapsed_ms":39.673,"exit_code":1,"observations":[{"actual":[["data",4],["data",null]],"check":"oracle 1","expected":[["data",4],["data",8]],"passed":false},{"actual":[["data",4],["data",8]],"check":"oracle 2","expected":[["data",4],["data",8]],"passed":true},{"actual":[["data",4],["JUNK",3],["data",null]],"check":"oracle 3","expected":[["data",4],["JUNK",3],["data",8]],"passed":false},{"actual":[],"check":"oracle 4","expected":[],"passed":true},{"actual":[["data",null]],"check":"oracle 5","expected":[["data",null]],"passed":true},{"actual":[["data",5],["data",null]],"check":"oracle 6","expected":[["data",5],["data",null]],"passed":true},{"actual":[["data",98]],"check":"oracle 7","expected":[["data",98]],"passed":true},{"actual":[["data",4],["data",null],["data",null],["data",null]],"check":"variant packet 1","expected":[["data",4],["data",8],["data",null],["data",null]],"passed":false}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"oracle 1\", \"actual\": [[\"data\", 4], [\"data\", null]], \"expected\": [[\"data\", 4], [\"data\", 8]], \"passed\": false}, {\"check\": \"oracle 2\", \"actual\": [[\"data\", 4], [\"data\", 8]], \"expected\": [[\"data\", 4], [\"data\", 8]], \"passed\": true}, {\"check\": \"oracle 3\", \"actual\": [[\"data\", 4], [\"JUNK\", 3], [\"data\", null]], \"expected\": [[\"data\", 4], [\"JUNK\", 3], [\"data\", 8]], \"passed\": false}, {\"check\": \"oracle 4\", \"actual\": [], \"expected\": [], \"passed\": true}, {\"check\": \"oracle 5\", \"actual\": [[\"data\", null]], \"expected\": [[\"data\", null]], \"passed\": true}, {\"check\": \"oracle 6\", \"actual\": [[\"data\", 5], [\"data\", null]], \"expected\": [[\"data\", 5], [\"data\", null]], \"passed\": true}, {\"check\": \"oracle 7\", \"actual\": [[\"data\", 98]], \"expected\": [[\"data\", 98]], \"passed\": true}, {\"check\": \"variant packet 1\", \"actual\": [[\"data\", 4], [\"data\", null], [\"data\", null], [\"data\", null]], \"expected\": [[\"data\", 4], [\"data\", 8], [\"data\", null], [\"data\", null]], \"passed\": false}], \"passed\": false}\n"},"broken":{"elapsed_ms":41.902,"exit_code":1,"observations":[{"actual":[["data",4],["data",4]],"check":"oracle 1","expected":[["data",4],["data",8]],"passed":false},{"actual":[["data",4],["data",8]],"check":"oracle 2","expected":[["data",4],["data",8]],"passed":true},{"actual":[["data",4],["JUNK",3],["data",4]],"check":"oracle 3","expected":[["data",4],["JUNK",3],["data",8]],"passed":false},{"actual":[],"check":"oracle 4","expected":[],"passed":true},{"actual":[["data",null]],"check":"oracle 5","expected":[["data",null]],"passed":true},{"actual":[["data",5],["data",5]],"check":"oracle 6","expected":[["data",5],["data",null]],"passed":false},{"actual":[["data",98]],"check":"oracle 7","expected":[["data",98]],"passed":true},{"actual":[["data",4],["data",4],["data",4],["data",4]],"check":"variant packet 1","expected":[["data",4],["data",8],["data",null],["data",null]],"passed":false}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"oracle 1\", \"actual\": [[\"data\", 4], [\"data\", 4]], \"expected\": [[\"data\", 4], [\"data\", 8]], \"passed\": false}, {\"check\": \"oracle 2\", \"actual\": [[\"data\", 4], [\"data\", 8]], \"expected\": [[\"data\", 4], [\"data\", 8]], \"passed\": true}, {\"check\": \"oracle 3\", \"actual\": [[\"data\", 4], [\"JUNK\", 3], [\"data\", 4]], \"expected\": [[\"data\", 4], [\"JUNK\", 3], [\"data\", 8]], \"passed\": false}, {\"check\": \"oracle 4\", \"actual\": [], \"expected\": [], \"passed\": true}, {\"check\": \"oracle 5\", \"actual\": [[\"data\", null]], \"expected\": [[\"data\", null]], \"passed\": true}, {\"check\": \"oracle 6\", \"actual\": [[\"data\", 5], [\"data\", 5]], \"expected\": [[\"data\", 5], [\"data\", null]], \"passed\": false}, {\"check\": \"oracle 7\", \"actual\": [[\"data\", 98]], \"expected\": [[\"data\", 98]], \"passed\": true}, {\"check\": \"variant packet 1\", \"actual\": [[\"data\", 4], [\"data\", 4], [\"data\", 4], [\"data\", 4]], \"expected\": [[\"data\", 4], [\"data\", 8], [\"data\", null], [\"data\", null]], \"passed\": false}], \"passed\": false}\n"},"fixed":{"elapsed_ms":42.287,"exit_code":0,"observations":[{"actual":[["data",4],["data",8]],"check":"oracle 1","expected":[["data",4],["data",8]],"passed":true},{"actual":[["data",4],["data",8]],"check":"oracle 2","expected":[["data",4],["data",8]],"passed":true},{"actual":[["data",4],["JUNK",3],["data",8]],"check":"oracle 3","expected":[["data",4],["JUNK",3],["data",8]],"passed":true},{"actual":[],"check":"oracle 4","expected":[],"passed":true},{"actual":[["data",null]],"check":"oracle 5","expected":[["data",null]],"passed":true},{"actual":[["data",5],["data",null]],"check":"oracle 6","expected":[["data",5],["data",null]],"passed":true},{"actual":[["data",98]],"check":"oracle 7","expected":[["data",98]],"passed":true},{"actual":[["data",4],["data",8],["data",null],["data",null]],"check":"variant packet 1","expected":[["data",4],["data",8],["data",null],["data",null]],"passed":true}],"passed":true,"stderr":"","stdout":"{\"observations\": [{\"check\": \"oracle 1\", \"actual\": [[\"data\", 4], [\"data\", 8]], \"expected\": [[\"data\", 4], [\"data\", 8]], \"passed\": true}, {\"check\": \"oracle 2\", \"actual\": [[\"data\", 4], [\"data\", 8]], \"expected\": [[\"data\", 4], [\"data\", 8]], \"passed\": true}, {\"check\": \"oracle 3\", \"actual\": [[\"data\", 4], [\"JUNK\", 3], [\"data\", 8]], \"expected\": [[\"data\", 4], [\"JUNK\", 3], [\"data\", 8]], \"passed\": true}, {\"check\": \"oracle 4\", \"actual\": [], \"expected\": [], \"passed\": true}, {\"check\": \"oracle 5\", \"actual\": [[\"data\", null]], \"expected\": [[\"data\", null]], \"passed\": true}, {\"check\": \"oracle 6\", \"actual\": [[\"data\", 5], [\"data\", null]], \"expected\": [[\"data\", 5], [\"data\", null]], \"passed\": true}, {\"check\": \"oracle 7\", \"actual\": [[\"data\", 98]], \"expected\": [[\"data\", 98]], \"passed\": true}, {\"check\": \"variant packet 1\", \"actual\": [[\"data\", 4], [\"data\", 8], [\"data\", null], [\"data\", null]], \"expected\": [[\"data\", 4], [\"data\", 8], [\"data\", null], [\"data\", null]], \"passed\": true}], \"passed\": true}\n"}},"verified":true,"visibility":"public"}