{"abstract":"Residual codes are returned instead of reconstructed amplitudes.","category":"PCM sample encoding","checks":8,"contract":"Reconstruct bounded delta-coded PCM from a seed and explicit sample-index resets before residual application, returning the continuation predictor.","evaluation_group":"s3-pcm-pcm-delta-reconstruction","failed_approach":"Emitting the pre-update predictor delays the waveform one sample.","family":"s3-pcm-pcm-delta-reconstruction-reconstructed-output","id":"FA-49231","implementations":{"attempt":{"sha256":"2490fc2b3a2fb6c4d4797bb311e68e1f974b986790fc6fa6f652d848ecdb8eed","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\n\nN = 1\nobservations = []\ndef solve(deltas, initial, reset_positions):\n    previous=initial\n    out=[]\n    for i,delta in enumerate(deltas):\n        if i in reset_positions:\n            previous=initial\n        previous+=delta\n        out.append(previous-delta)\n    return [out,previous]\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\ncheck('oracle 1', solve(*([2, -1, 3], 10, [])), [[12, 11, 14], 14])\ncheck('oracle 2', solve(*([1, 2, 3, 4], 5, [2])), [[6, 8, 8, 12], 12])\ncheck('oracle 3', solve(*([], 7, [])), [[], 7])\ncheck('oracle 4', solve(*([0, 0], -3, [0])), [[-3, -3], -3])\ncheck('oracle 5', solve(*([-2, 4, -1], 0, [1])), [[-2, 4, 3], 3])\ncheck('oracle 6', solve(*([3], 2, [])), [[5], 5])\ncheck('oracle 7', solve(*([1, 1, 1], 1, [0, 1, 2])), [[2, 2, 2], 2])\nif N == 1: check('variant packet 1', solve(*[[2, -1, 3, 2, -1, 3], 10, []]), [[12, 11, 14, 16, 15, 18], 18])\nif N == 2: check('variant packet 2', solve(*[[2, -1, 3, 2, -1, 3, 2, -1, 3], 10, []]), [[12, 11, 14, 16, 15, 18, 20, 19, 22], 22])\nif N == 3: check('variant packet 3', solve(*[[2, -1, 3, 2, -1, 3, 2, -1, 3, 2, -1, 3], 10, []]), [[12, 11, 14, 16, 15, 18, 20, 19, 22, 24, 23, 26], 26])\nif N == 4: check('variant packet 4', solve(*[[2, -1, 3, 2, -1, 3, 2, -1, 3, 2, -1, 3, 2, -1, 3], 10, []]), [[12, 11, 14, 16, 15, 18, 20, 19, 22, 24, 23, 26, 28, 27, 30], 30])\nif N == 5: check('variant packet 5', solve(*[[2, -1, 3, 2, -1, 3, 2, -1, 3, 2, -1, 3, 2, -1, 3, 2, -1, 3], 10, []]), [[12, 11, 14, 16, 15, 18, 20, 19, 22, 24, 23, 26, 28, 27, 30, 32, 31, 34], 34])\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":"1ae86efaa0f8b7dbb09873745855545583c2d3d154536755fb4a0575dba885d7","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\n\nN = 1\nobservations = []\ndef solve(deltas, initial, reset_positions):\n    previous=initial\n    out=[]\n    for i,delta in enumerate(deltas):\n        if i in reset_positions:\n            previous=initial\n        previous+=delta\n        out.append(delta)\n    return [out,previous]\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\ncheck('oracle 1', solve(*([2, -1, 3], 10, [])), [[12, 11, 14], 14])\ncheck('oracle 2', solve(*([1, 2, 3, 4], 5, [2])), [[6, 8, 8, 12], 12])\ncheck('oracle 3', solve(*([], 7, [])), [[], 7])\ncheck('oracle 4', solve(*([0, 0], -3, [0])), [[-3, -3], -3])\ncheck('oracle 5', solve(*([-2, 4, -1], 0, [1])), [[-2, 4, 3], 3])\ncheck('oracle 6', solve(*([3], 2, [])), [[5], 5])\ncheck('oracle 7', solve(*([1, 1, 1], 1, [0, 1, 2])), [[2, 2, 2], 2])\nif N == 1: check('variant packet 1', solve(*[[2, -1, 3, 2, -1, 3], 10, []]), [[12, 11, 14, 16, 15, 18], 18])\nif N == 2: check('variant packet 2', solve(*[[2, -1, 3, 2, -1, 3, 2, -1, 3], 10, []]), [[12, 11, 14, 16, 15, 18, 20, 19, 22], 22])\nif N == 3: check('variant packet 3', solve(*[[2, -1, 3, 2, -1, 3, 2, -1, 3, 2, -1, 3], 10, []]), [[12, 11, 14, 16, 15, 18, 20, 19, 22, 24, 23, 26], 26])\nif N == 4: check('variant packet 4', solve(*[[2, -1, 3, 2, -1, 3, 2, -1, 3, 2, -1, 3, 2, -1, 3], 10, []]), [[12, 11, 14, 16, 15, 18, 20, 19, 22, 24, 23, 26, 28, 27, 30], 30])\nif N == 5: check('variant packet 5', solve(*[[2, -1, 3, 2, -1, 3, 2, -1, 3, 2, -1, 3, 2, -1, 3, 2, -1, 3], 10, []]), [[12, 11, 14, 16, 15, 18, 20, 19, 22, 24, 23, 26, 28, 27, 30, 32, 31, 34], 34])\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":"7a2542fc018856e5d2479ea2204d465ae6c94048c48d0793d6c34727392a72b4","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\n\nN = 1\nobservations = []\ndef solve(deltas, initial, reset_positions):\n    previous=initial\n    out=[]\n    for i,delta in enumerate(deltas):\n        if i in reset_positions:\n            previous=initial\n        previous+=delta\n        out.append(previous)\n    return [out,previous]\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\ncheck('oracle 1', solve(*([2, -1, 3], 10, [])), [[12, 11, 14], 14])\ncheck('oracle 2', solve(*([1, 2, 3, 4], 5, [2])), [[6, 8, 8, 12], 12])\ncheck('oracle 3', solve(*([], 7, [])), [[], 7])\ncheck('oracle 4', solve(*([0, 0], -3, [0])), [[-3, -3], -3])\ncheck('oracle 5', solve(*([-2, 4, -1], 0, [1])), [[-2, 4, 3], 3])\ncheck('oracle 6', solve(*([3], 2, [])), [[5], 5])\ncheck('oracle 7', solve(*([1, 1, 1], 1, [0, 1, 2])), [[2, 2, 2], 2])\nif N == 1: check('variant packet 1', solve(*[[2, -1, 3, 2, -1, 3], 10, []]), [[12, 11, 14, 16, 15, 18], 18])\nif N == 2: check('variant packet 2', solve(*[[2, -1, 3, 2, -1, 3, 2, -1, 3], 10, []]), [[12, 11, 14, 16, 15, 18, 20, 19, 22], 22])\nif N == 3: check('variant packet 3', solve(*[[2, -1, 3, 2, -1, 3, 2, -1, 3, 2, -1, 3], 10, []]), [[12, 11, 14, 16, 15, 18, 20, 19, 22, 24, 23, 26], 26])\nif N == 4: check('variant packet 4', solve(*[[2, -1, 3, 2, -1, 3, 2, -1, 3, 2, -1, 3, 2, -1, 3], 10, []]), [[12, 11, 14, 16, 15, 18, 20, 19, 22, 24, 23, 26, 28, 27, 30], 30])\nif N == 5: check('variant packet 5', solve(*[[2, -1, 3, 2, -1, 3, 2, -1, 3, 2, -1, 3, 2, -1, 3, 2, -1, 3], 10, []]), [[12, 11, 14, 16, 15, 18, 20, 19, 22, 24, 23, 26, 28, 27, 30, 32, 31, 34], 34])\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-delta-reconstruction-reconstructed-output","generated_at":"2026-09-29T14:44:57.968779+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 reconstructed output.","root_cause":"Residual codes are returned instead of reconstructed amplitudes.","sha256":"79b2539494a2ce167c8088bad824f561dbd81dfd13565eaeea1f67dbf0961f08","title":"Pcm delta reconstruction: reconstructed output · case 01","variant":1,"variant_policy":"Five numbered records share a model and may reuse boundary fixtures.","verification":{"attempt":{"elapsed_ms":42.141,"exit_code":1,"observations":[{"actual":[[10,12,11],14],"check":"oracle 1","expected":[[12,11,14],14],"passed":false},{"actual":[[5,6,5,8],12],"check":"oracle 2","expected":[[6,8,8,12],12],"passed":false},{"actual":[[],7],"check":"oracle 3","expected":[[],7],"passed":true},{"actual":[[-3,-3],-3],"check":"oracle 4","expected":[[-3,-3],-3],"passed":true},{"actual":[[0,0,4],3],"check":"oracle 5","expected":[[-2,4,3],3],"passed":false},{"actual":[[2],5],"check":"oracle 6","expected":[[5],5],"passed":false},{"actual":[[1,1,1],2],"check":"oracle 7","expected":[[2,2,2],2],"passed":false},{"actual":[[10,12,11,14,16,15],18],"check":"variant packet 1","expected":[[12,11,14,16,15,18],18],"passed":false}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"oracle 1\", \"actual\": [[10, 12, 11], 14], \"expected\": [[12, 11, 14], 14], \"passed\": false}, {\"check\": \"oracle 2\", \"actual\": [[5, 6, 5, 8], 12], \"expected\": [[6, 8, 8, 12], 12], \"passed\": false}, {\"check\": \"oracle 3\", \"actual\": [[], 7], \"expected\": [[], 7], \"passed\": true}, {\"check\": \"oracle 4\", \"actual\": [[-3, -3], -3], \"expected\": [[-3, -3], -3], \"passed\": true}, {\"check\": \"oracle 5\", \"actual\": [[0, 0, 4], 3], \"expected\": [[-2, 4, 3], 3], \"passed\": false}, {\"check\": \"oracle 6\", \"actual\": [[2], 5], \"expected\": [[5], 5], \"passed\": false}, {\"check\": \"oracle 7\", \"actual\": [[1, 1, 1], 2], \"expected\": [[2, 2, 2], 2], \"passed\": false}, {\"check\": \"variant packet 1\", \"actual\": [[10, 12, 11, 14, 16, 15], 18], \"expected\": [[12, 11, 14, 16, 15, 18], 18], \"passed\": false}], \"passed\": false}\n"},"broken":{"elapsed_ms":42.728,"exit_code":1,"observations":[{"actual":[[2,-1,3],14],"check":"oracle 1","expected":[[12,11,14],14],"passed":false},{"actual":[[1,2,3,4],12],"check":"oracle 2","expected":[[6,8,8,12],12],"passed":false},{"actual":[[],7],"check":"oracle 3","expected":[[],7],"passed":true},{"actual":[[0,0],-3],"check":"oracle 4","expected":[[-3,-3],-3],"passed":false},{"actual":[[-2,4,-1],3],"check":"oracle 5","expected":[[-2,4,3],3],"passed":false},{"actual":[[3],5],"check":"oracle 6","expected":[[5],5],"passed":false},{"actual":[[1,1,1],2],"check":"oracle 7","expected":[[2,2,2],2],"passed":false},{"actual":[[2,-1,3,2,-1,3],18],"check":"variant packet 1","expected":[[12,11,14,16,15,18],18],"passed":false}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"oracle 1\", \"actual\": [[2, -1, 3], 14], \"expected\": [[12, 11, 14], 14], \"passed\": false}, {\"check\": \"oracle 2\", \"actual\": [[1, 2, 3, 4], 12], \"expected\": [[6, 8, 8, 12], 12], \"passed\": false}, {\"check\": \"oracle 3\", \"actual\": [[], 7], \"expected\": [[], 7], \"passed\": true}, {\"check\": \"oracle 4\", \"actual\": [[0, 0], -3], \"expected\": [[-3, -3], -3], \"passed\": false}, {\"check\": \"oracle 5\", \"actual\": [[-2, 4, -1], 3], \"expected\": [[-2, 4, 3], 3], \"passed\": false}, {\"check\": \"oracle 6\", \"actual\": [[3], 5], \"expected\": [[5], 5], \"passed\": false}, {\"check\": \"oracle 7\", \"actual\": [[1, 1, 1], 2], \"expected\": [[2, 2, 2], 2], \"passed\": false}, {\"check\": \"variant packet 1\", \"actual\": [[2, -1, 3, 2, -1, 3], 18], \"expected\": [[12, 11, 14, 16, 15, 18], 18], \"passed\": false}], \"passed\": false}\n"},"fixed":{"elapsed_ms":40.71,"exit_code":0,"observations":[{"actual":[[12,11,14],14],"check":"oracle 1","expected":[[12,11,14],14],"passed":true},{"actual":[[6,8,8,12],12],"check":"oracle 2","expected":[[6,8,8,12],12],"passed":true},{"actual":[[],7],"check":"oracle 3","expected":[[],7],"passed":true},{"actual":[[-3,-3],-3],"check":"oracle 4","expected":[[-3,-3],-3],"passed":true},{"actual":[[-2,4,3],3],"check":"oracle 5","expected":[[-2,4,3],3],"passed":true},{"actual":[[5],5],"check":"oracle 6","expected":[[5],5],"passed":true},{"actual":[[2,2,2],2],"check":"oracle 7","expected":[[2,2,2],2],"passed":true},{"actual":[[12,11,14,16,15,18],18],"check":"variant packet 1","expected":[[12,11,14,16,15,18],18],"passed":true}],"passed":true,"stderr":"","stdout":"{\"observations\": [{\"check\": \"oracle 1\", \"actual\": [[12, 11, 14], 14], \"expected\": [[12, 11, 14], 14], \"passed\": true}, {\"check\": \"oracle 2\", \"actual\": [[6, 8, 8, 12], 12], \"expected\": [[6, 8, 8, 12], 12], \"passed\": true}, {\"check\": \"oracle 3\", \"actual\": [[], 7], \"expected\": [[], 7], \"passed\": true}, {\"check\": \"oracle 4\", \"actual\": [[-3, -3], -3], \"expected\": [[-3, -3], -3], \"passed\": true}, {\"check\": \"oracle 5\", \"actual\": [[-2, 4, 3], 3], \"expected\": [[-2, 4, 3], 3], \"passed\": true}, {\"check\": \"oracle 6\", \"actual\": [[5], 5], \"expected\": [[5], 5], \"passed\": true}, {\"check\": \"oracle 7\", \"actual\": [[2, 2, 2], 2], \"expected\": [[2, 2, 2], 2], \"passed\": true}, {\"check\": \"variant packet 1\", \"actual\": [[12, 11, 14, 16, 15, 18], 18], \"expected\": [[12, 11, 14, 16, 15, 18], 18], \"passed\": true}], \"passed\": true}\n"}},"verified":true,"visibility":"public"}