{"abstract":"Frame reset initializes digital zero instead of packet channel seeds.","category":"PCM sample encoding","checks":8,"contract":"Decode channel-banked residual PCM, resetting predictors only at specified frame boundaries and exporting final per-channel amplitudes.","contract_signature":"frames, seeds, resets","evaluation_group":"s3-pcm-pcm-channel-reconstruction","failed_approach":"Reversing seed order corrupts channel-specific DC values.","family":"s3-pcm-pcm-channel-reconstruction-reset-seeds","id":"FA-49376","implementations":{"attempt":{"sha256":"c9fe2de55cc0990a5942696e3ef0384b0f913d12da8023cce0408e68e8577f2e","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\n\nN = 1\nobservations = []\ndef solve(frames, seeds, resets):\n    state=list(seeds)\n    out=[]\n    for index,frame in enumerate(frames):\n        if index in resets:\n            state=list(reversed(seeds))\n        reconstructed=[]\n        for channel,residual in enumerate(frame):\n            state[channel]+=residual\n            reconstructed.append(state[channel])\n        out.append(reconstructed)\n    return [out,state]\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\ncheck('oracle 1', solve(*([[3, 2], [2, -1]], [2, 8], [])), [[[5, 10], [7, 9]], [7, 9]])\ncheck('oracle 2', solve(*([[1, 2], [2, 3], [4, 1]], [1, 2], [1])), [[[2, 4], [3, 5], [7, 6]], [7, 6]])\ncheck('oracle 3', solve(*([], [3, 4], [])), [[], [3, 4]])\ncheck('oracle 4', solve(*([[1], [2], [-1]], [0], [2])), [[[1], [3], [-1]], [-1]])\ncheck('oracle 5', solve(*([[-1, -1], [2, -2]], [-1, 4], [])), [[[-2, 3], [0, 1]], [0, 1]])\ncheck('oracle 6', solve(*([[1, 2, 3]], [3, 2, 1], [0])), [[[4, 4, 4]], [4, 4, 4]])\ncheck('oracle 7', solve(*([[0, 0], [0, 0]], [1, -1], [])), [[[1, -1], [1, -1]], [1, -1]])\nif N == 1: check('variant packet 1', solve(*[[[3, 2], [2, -1], [3, 2], [2, -1]], [2, 8], []]), [[[5, 10], [7, 9], [10, 11], [12, 10]], [12, 10]])\nif N == 2: check('variant packet 2', solve(*[[[3, 2], [2, -1], [3, 2], [2, -1], [3, 2], [2, -1]], [2, 8], []]), [[[5, 10], [7, 9], [10, 11], [12, 10], [15, 12], [17, 11]], [17, 11]])\nif N == 3: check('variant packet 3', solve(*[[[3, 2], [2, -1], [3, 2], [2, -1], [3, 2], [2, -1], [3, 2], [2, -1]], [2, 8], []]), [[[5, 10], [7, 9], [10, 11], [12, 10], [15, 12], [17, 11], [20, 13], [22, 12]], [22, 12]])\nif N == 4: check('variant packet 4', solve(*[[[3, 2], [2, -1], [3, 2], [2, -1], [3, 2], [2, -1], [3, 2], [2, -1], [3, 2], [2, -1]], [2, 8], []]), [[[5, 10], [7, 9], [10, 11], [12, 10], [15, 12], [17, 11], [20, 13], [22, 12], [25, 14], [27, 13]], [27, 13]])\nif N == 5: check('variant packet 5', solve(*[[[3, 2], [2, -1], [3, 2], [2, -1], [3, 2], [2, -1], [3, 2], [2, -1], [3, 2], [2, -1], [3, 2], [2, -1]], [2, 8], []]), [[[5, 10], [7, 9], [10, 11], [12, 10], [15, 12], [17, 11], [20, 13], [22, 12], [25, 14], [27, 13], [30, 15], [32, 14]], [32, 14]])\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":"487ca059104a88c3f3207c5d893775289041725f217c968b77c99957d8faec88","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\n\nN = 1\nobservations = []\ndef solve(frames, seeds, resets):\n    state=list(seeds)\n    out=[]\n    for index,frame in enumerate(frames):\n        if index in resets:\n            state=[0]*len(seeds)\n        reconstructed=[]\n        for channel,residual in enumerate(frame):\n            state[channel]+=residual\n            reconstructed.append(state[channel])\n        out.append(reconstructed)\n    return [out,state]\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\ncheck('oracle 1', solve(*([[3, 2], [2, -1]], [2, 8], [])), [[[5, 10], [7, 9]], [7, 9]])\ncheck('oracle 2', solve(*([[1, 2], [2, 3], [4, 1]], [1, 2], [1])), [[[2, 4], [3, 5], [7, 6]], [7, 6]])\ncheck('oracle 3', solve(*([], [3, 4], [])), [[], [3, 4]])\ncheck('oracle 4', solve(*([[1], [2], [-1]], [0], [2])), [[[1], [3], [-1]], [-1]])\ncheck('oracle 5', solve(*([[-1, -1], [2, -2]], [-1, 4], [])), [[[-2, 3], [0, 1]], [0, 1]])\ncheck('oracle 6', solve(*([[1, 2, 3]], [3, 2, 1], [0])), [[[4, 4, 4]], [4, 4, 4]])\ncheck('oracle 7', solve(*([[0, 0], [0, 0]], [1, -1], [])), [[[1, -1], [1, -1]], [1, -1]])\nif N == 1: check('variant packet 1', solve(*[[[3, 2], [2, -1], [3, 2], [2, -1]], [2, 8], []]), [[[5, 10], [7, 9], [10, 11], [12, 10]], [12, 10]])\nif N == 2: check('variant packet 2', solve(*[[[3, 2], [2, -1], [3, 2], [2, -1], [3, 2], [2, -1]], [2, 8], []]), [[[5, 10], [7, 9], [10, 11], [12, 10], [15, 12], [17, 11]], [17, 11]])\nif N == 3: check('variant packet 3', solve(*[[[3, 2], [2, -1], [3, 2], [2, -1], [3, 2], [2, -1], [3, 2], [2, -1]], [2, 8], []]), [[[5, 10], [7, 9], [10, 11], [12, 10], [15, 12], [17, 11], [20, 13], [22, 12]], [22, 12]])\nif N == 4: check('variant packet 4', solve(*[[[3, 2], [2, -1], [3, 2], [2, -1], [3, 2], [2, -1], [3, 2], [2, -1], [3, 2], [2, -1]], [2, 8], []]), [[[5, 10], [7, 9], [10, 11], [12, 10], [15, 12], [17, 11], [20, 13], [22, 12], [25, 14], [27, 13]], [27, 13]])\nif N == 5: check('variant packet 5', solve(*[[[3, 2], [2, -1], [3, 2], [2, -1], [3, 2], [2, -1], [3, 2], [2, -1], [3, 2], [2, -1], [3, 2], [2, -1]], [2, 8], []]), [[[5, 10], [7, 9], [10, 11], [12, 10], [15, 12], [17, 11], [20, 13], [22, 12], [25, 14], [27, 13], [30, 15], [32, 14]], [32, 14]])\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-channel-reconstruction-reset-seeds","generated_at":"2026-09-29T14:44:59.565152+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":"Frame reset initializes digital zero instead of packet channel seeds.","sha256":"bad5f4ccb238614aefd93d99dedbfaee938f195e8cfb79710e150e46f7ce7176","title":"Pcm channel reconstruction: reset seeds · 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":40.039,"exit_code":1,"observations":[{"actual":[[[5,10],[7,9]],[7,9]],"check":"oracle 1","expected":[[[5,10],[7,9]],[7,9]],"passed":true},{"actual":[[[2,4],[4,4],[8,5]],[8,5]],"check":"oracle 2","expected":[[[2,4],[3,5],[7,6]],[7,6]],"passed":false},{"actual":[[],[3,4]],"check":"oracle 3","expected":[[],[3,4]],"passed":true},{"actual":[[[1],[3],[-1]],[-1]],"check":"oracle 4","expected":[[[1],[3],[-1]],[-1]],"passed":true},{"actual":[[[-2,3],[0,1]],[0,1]],"check":"oracle 5","expected":[[[-2,3],[0,1]],[0,1]],"passed":true},{"actual":[[[2,4,6]],[2,4,6]],"check":"oracle 6","expected":[[[4,4,4]],[4,4,4]],"passed":false},{"actual":[[[1,-1],[1,-1]],[1,-1]],"check":"oracle 7","expected":[[[1,-1],[1,-1]],[1,-1]],"passed":true},{"actual":[[[5,10],[7,9],[10,11],[12,10]],[12,10]],"check":"variant packet 1","expected":[[[5,10],[7,9],[10,11],[12,10]],[12,10]],"passed":true}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"oracle 1\", \"actual\": [[[5, 10], [7, 9]], [7, 9]], \"expected\": [[[5, 10], [7, 9]], [7, 9]], \"passed\": true}, {\"check\": \"oracle 2\", \"actual\": [[[2, 4], [4, 4], [8, 5]], [8, 5]], \"expected\": [[[2, 4], [3, 5], [7, 6]], [7, 6]], \"passed\": false}, {\"check\": \"oracle 3\", \"actual\": [[], [3, 4]], \"expected\": [[], [3, 4]], \"passed\": true}, {\"check\": \"oracle 4\", \"actual\": [[[1], [3], [-1]], [-1]], \"expected\": [[[1], [3], [-1]], [-1]], \"passed\": true}, {\"check\": \"oracle 5\", \"actual\": [[[-2, 3], [0, 1]], [0, 1]], \"expected\": [[[-2, 3], [0, 1]], [0, 1]], \"passed\": true}, {\"check\": \"oracle 6\", \"actual\": [[[2, 4, 6]], [2, 4, 6]], \"expected\": [[[4, 4, 4]], [4, 4, 4]], \"passed\": false}, {\"check\": \"oracle 7\", \"actual\": [[[1, -1], [1, -1]], [1, -1]], \"expected\": [[[1, -1], [1, -1]], [1, -1]], \"passed\": true}, {\"check\": \"variant packet 1\", \"actual\": [[[5, 10], [7, 9], [10, 11], [12, 10]], [12, 10]], \"expected\": [[[5, 10], [7, 9], [10, 11], [12, 10]], [12, 10]], \"passed\": true}], \"passed\": false}\n"},"broken":{"elapsed_ms":41.135,"exit_code":1,"observations":[{"actual":[[[5,10],[7,9]],[7,9]],"check":"oracle 1","expected":[[[5,10],[7,9]],[7,9]],"passed":true},{"actual":[[[2,4],[2,3],[6,4]],[6,4]],"check":"oracle 2","expected":[[[2,4],[3,5],[7,6]],[7,6]],"passed":false},{"actual":[[],[3,4]],"check":"oracle 3","expected":[[],[3,4]],"passed":true},{"actual":[[[1],[3],[-1]],[-1]],"check":"oracle 4","expected":[[[1],[3],[-1]],[-1]],"passed":true},{"actual":[[[-2,3],[0,1]],[0,1]],"check":"oracle 5","expected":[[[-2,3],[0,1]],[0,1]],"passed":true},{"actual":[[[1,2,3]],[1,2,3]],"check":"oracle 6","expected":[[[4,4,4]],[4,4,4]],"passed":false},{"actual":[[[1,-1],[1,-1]],[1,-1]],"check":"oracle 7","expected":[[[1,-1],[1,-1]],[1,-1]],"passed":true},{"actual":[[[5,10],[7,9],[10,11],[12,10]],[12,10]],"check":"variant packet 1","expected":[[[5,10],[7,9],[10,11],[12,10]],[12,10]],"passed":true}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"oracle 1\", \"actual\": [[[5, 10], [7, 9]], [7, 9]], \"expected\": [[[5, 10], [7, 9]], [7, 9]], \"passed\": true}, {\"check\": \"oracle 2\", \"actual\": [[[2, 4], [2, 3], [6, 4]], [6, 4]], \"expected\": [[[2, 4], [3, 5], [7, 6]], [7, 6]], \"passed\": false}, {\"check\": \"oracle 3\", \"actual\": [[], [3, 4]], \"expected\": [[], [3, 4]], \"passed\": true}, {\"check\": \"oracle 4\", \"actual\": [[[1], [3], [-1]], [-1]], \"expected\": [[[1], [3], [-1]], [-1]], \"passed\": true}, {\"check\": \"oracle 5\", \"actual\": [[[-2, 3], [0, 1]], [0, 1]], \"expected\": [[[-2, 3], [0, 1]], [0, 1]], \"passed\": true}, {\"check\": \"oracle 6\", \"actual\": [[[1, 2, 3]], [1, 2, 3]], \"expected\": [[[4, 4, 4]], [4, 4, 4]], \"passed\": false}, {\"check\": \"oracle 7\", \"actual\": [[[1, -1], [1, -1]], [1, -1]], \"expected\": [[[1, -1], [1, -1]], [1, -1]], \"passed\": true}, {\"check\": \"variant packet 1\", \"actual\": [[[5, 10], [7, 9], [10, 11], [12, 10]], [12, 10]], \"expected\": [[[5, 10], [7, 9], [10, 11], [12, 10]], [12, 10]], \"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."}}