{"abstract":"Active TDM mask is interpreted with reversed slot numbering.","category":"PCM sample encoding","checks":8,"contract":"Stipulated TDM PCM extractor: active mask bits name ascending physical slots; ignore mask bits above slot count and reject incomplete physical frames.","contract_signature":"frames, active_mask, slots","evaluation_group":"s3-pcm-pcm-tdm-active-slots","failed_approach":"AND against slot index rather than its bit cannot select correct lanes.","family":"s3-pcm-pcm-tdm-active-slots-slot-mask-order","id":"FA-49991","implementations":{"attempt":{"sha256":"8c50367b4272edfeef47696af168a37b5180ad8204a5a841f8175956a7e357a3","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\n\nN = 1\nobservations = []\ndef solve(frames, active_mask, slots):\n    channels=[i for i in range(slots) if active_mask&i]\n    out=[]\n    for frame in frames:\n        if len(frame)<slots:\n            out.append(None)\n            continue\n        out.append([frame[i] if i<len(frame) else None for i in channels])\n    return [channels,out]\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\ncheck('oracle 1', solve(*([[10, 20, 30, 40], [1, 2, 3, 4]], 10, 4)), [[1, 3], [[20, 40], [2, 4]]])\ncheck('oracle 2', solve(*([[1, 2]], 8, 4)), [[3], [None]])\ncheck('oracle 3', solve(*([[1, 2, 3]], 0, 3)), [[], [[]]])\ncheck('oracle 4', solve(*([], 3, 4)), [[0, 1], []])\ncheck('oracle 5', solve(*([[1, 2, 3, 4]], 9, 4)), [[0, 3], [[1, 4]]])\ncheck('oracle 6', solve(*([[1, 2]], 1, 2)), [[0], [[1]]])\ncheck('oracle 7', solve(*([[1, 2, 3, 4]], 16, 4)), [[], [[]]])\nif N == 1: check('variant packet 1', solve(*[[[10, 20, 30, 40], [1, 2, 3, 4], [10, 20, 30, 40], [1, 2, 3, 4]], 10, 4]), [[1, 3], [[20, 40], [2, 4], [20, 40], [2, 4]]])\nif N == 2: check('variant packet 2', solve(*[[[10, 20, 30, 40], [1, 2, 3, 4], [10, 20, 30, 40], [1, 2, 3, 4], [10, 20, 30, 40], [1, 2, 3, 4]], 10, 4]), [[1, 3], [[20, 40], [2, 4], [20, 40], [2, 4], [20, 40], [2, 4]]])\nif N == 3: check('variant packet 3', solve(*[[[10, 20, 30, 40], [1, 2, 3, 4], [10, 20, 30, 40], [1, 2, 3, 4], [10, 20, 30, 40], [1, 2, 3, 4], [10, 20, 30, 40], [1, 2, 3, 4]], 10, 4]), [[1, 3], [[20, 40], [2, 4], [20, 40], [2, 4], [20, 40], [2, 4], [20, 40], [2, 4]]])\nif N == 4: check('variant packet 4', solve(*[[[10, 20, 30, 40], [1, 2, 3, 4], [10, 20, 30, 40], [1, 2, 3, 4], [10, 20, 30, 40], [1, 2, 3, 4], [10, 20, 30, 40], [1, 2, 3, 4], [10, 20, 30, 40], [1, 2, 3, 4]], 10, 4]), [[1, 3], [[20, 40], [2, 4], [20, 40], [2, 4], [20, 40], [2, 4], [20, 40], [2, 4], [20, 40], [2, 4]]])\nif N == 5: check('variant packet 5', solve(*[[[10, 20, 30, 40], [1, 2, 3, 4], [10, 20, 30, 40], [1, 2, 3, 4], [10, 20, 30, 40], [1, 2, 3, 4], [10, 20, 30, 40], [1, 2, 3, 4], [10, 20, 30, 40], [1, 2, 3, 4], [10, 20, 30, 40], [1, 2, 3, 4]], 10, 4]), [[1, 3], [[20, 40], [2, 4], [20, 40], [2, 4], [20, 40], [2, 4], [20, 40], [2, 4], [20, 40], [2, 4], [20, 40], [2, 4]]])\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":"d5e66d8e1aee64638c32f16e4d7cb05824608860417a8e5ff0d198afdd25ecc0","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\n\nN = 1\nobservations = []\ndef solve(frames, active_mask, slots):\n    channels=[i for i in range(slots) if active_mask&(1<<(slots-1-i))]\n    out=[]\n    for frame in frames:\n        if len(frame)<slots:\n            out.append(None)\n            continue\n        out.append([frame[i] if i<len(frame) else None for i in channels])\n    return [channels,out]\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\ncheck('oracle 1', solve(*([[10, 20, 30, 40], [1, 2, 3, 4]], 10, 4)), [[1, 3], [[20, 40], [2, 4]]])\ncheck('oracle 2', solve(*([[1, 2]], 8, 4)), [[3], [None]])\ncheck('oracle 3', solve(*([[1, 2, 3]], 0, 3)), [[], [[]]])\ncheck('oracle 4', solve(*([], 3, 4)), [[0, 1], []])\ncheck('oracle 5', solve(*([[1, 2, 3, 4]], 9, 4)), [[0, 3], [[1, 4]]])\ncheck('oracle 6', solve(*([[1, 2]], 1, 2)), [[0], [[1]]])\ncheck('oracle 7', solve(*([[1, 2, 3, 4]], 16, 4)), [[], [[]]])\nif N == 1: check('variant packet 1', solve(*[[[10, 20, 30, 40], [1, 2, 3, 4], [10, 20, 30, 40], [1, 2, 3, 4]], 10, 4]), [[1, 3], [[20, 40], [2, 4], [20, 40], [2, 4]]])\nif N == 2: check('variant packet 2', solve(*[[[10, 20, 30, 40], [1, 2, 3, 4], [10, 20, 30, 40], [1, 2, 3, 4], [10, 20, 30, 40], [1, 2, 3, 4]], 10, 4]), [[1, 3], [[20, 40], [2, 4], [20, 40], [2, 4], [20, 40], [2, 4]]])\nif N == 3: check('variant packet 3', solve(*[[[10, 20, 30, 40], [1, 2, 3, 4], [10, 20, 30, 40], [1, 2, 3, 4], [10, 20, 30, 40], [1, 2, 3, 4], [10, 20, 30, 40], [1, 2, 3, 4]], 10, 4]), [[1, 3], [[20, 40], [2, 4], [20, 40], [2, 4], [20, 40], [2, 4], [20, 40], [2, 4]]])\nif N == 4: check('variant packet 4', solve(*[[[10, 20, 30, 40], [1, 2, 3, 4], [10, 20, 30, 40], [1, 2, 3, 4], [10, 20, 30, 40], [1, 2, 3, 4], [10, 20, 30, 40], [1, 2, 3, 4], [10, 20, 30, 40], [1, 2, 3, 4]], 10, 4]), [[1, 3], [[20, 40], [2, 4], [20, 40], [2, 4], [20, 40], [2, 4], [20, 40], [2, 4], [20, 40], [2, 4]]])\nif N == 5: check('variant packet 5', solve(*[[[10, 20, 30, 40], [1, 2, 3, 4], [10, 20, 30, 40], [1, 2, 3, 4], [10, 20, 30, 40], [1, 2, 3, 4], [10, 20, 30, 40], [1, 2, 3, 4], [10, 20, 30, 40], [1, 2, 3, 4], [10, 20, 30, 40], [1, 2, 3, 4]], 10, 4]), [[1, 3], [[20, 40], [2, 4], [20, 40], [2, 4], [20, 40], [2, 4], [20, 40], [2, 4], [20, 40], [2, 4], [20, 40], [2, 4]]])\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-tdm-active-slots-slot-mask-order","generated_at":"2026-09-29T14:45:05.254644+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":"Active TDM mask is interpreted with reversed slot numbering.","sha256":"74031e4a4f1cd9548cbdfefdeca8c5c09b18914a87620fdd847e22733adbd2b9","title":"Pcm tdm active slots: slot mask order · 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":40.153,"exit_code":1,"observations":[{"actual":[[2,3],[[30,40],[3,4]]],"check":"oracle 1","expected":[[1,3],[[20,40],[2,4]]],"passed":false},{"actual":[[],[null]],"check":"oracle 2","expected":[[3],[null]],"passed":false},{"actual":[[],[[]]],"check":"oracle 3","expected":[[],[[]]],"passed":true},{"actual":[[1,2,3],[]],"check":"oracle 4","expected":[[0,1],[]],"passed":false},{"actual":[[1,3],[[2,4]]],"check":"oracle 5","expected":[[0,3],[[1,4]]],"passed":false},{"actual":[[1],[[2]]],"check":"oracle 6","expected":[[0],[[1]]],"passed":false},{"actual":[[],[[]]],"check":"oracle 7","expected":[[],[[]]],"passed":true},{"actual":[[2,3],[[30,40],[3,4],[30,40],[3,4]]],"check":"variant packet 1","expected":[[1,3],[[20,40],[2,4],[20,40],[2,4]]],"passed":false}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"oracle 1\", \"actual\": [[2, 3], [[30, 40], [3, 4]]], \"expected\": [[1, 3], [[20, 40], [2, 4]]], \"passed\": false}, {\"check\": \"oracle 2\", \"actual\": [[], [null]], \"expected\": [[3], [null]], \"passed\": false}, {\"check\": \"oracle 3\", \"actual\": [[], [[]]], \"expected\": [[], [[]]], \"passed\": true}, {\"check\": \"oracle 4\", \"actual\": [[1, 2, 3], []], \"expected\": [[0, 1], []], \"passed\": false}, {\"check\": \"oracle 5\", \"actual\": [[1, 3], [[2, 4]]], \"expected\": [[0, 3], [[1, 4]]], \"passed\": false}, {\"check\": \"oracle 6\", \"actual\": [[1], [[2]]], \"expected\": [[0], [[1]]], \"passed\": false}, {\"check\": \"oracle 7\", \"actual\": [[], [[]]], \"expected\": [[], [[]]], \"passed\": true}, {\"check\": \"variant packet 1\", \"actual\": [[2, 3], [[30, 40], [3, 4], [30, 40], [3, 4]]], \"expected\": [[1, 3], [[20, 40], [2, 4], [20, 40], [2, 4]]], \"passed\": false}], \"passed\": false}\n"},"broken":{"elapsed_ms":39.71,"exit_code":1,"observations":[{"actual":[[0,2],[[10,30],[1,3]]],"check":"oracle 1","expected":[[1,3],[[20,40],[2,4]]],"passed":false},{"actual":[[0],[null]],"check":"oracle 2","expected":[[3],[null]],"passed":false},{"actual":[[],[[]]],"check":"oracle 3","expected":[[],[[]]],"passed":true},{"actual":[[2,3],[]],"check":"oracle 4","expected":[[0,1],[]],"passed":false},{"actual":[[0,3],[[1,4]]],"check":"oracle 5","expected":[[0,3],[[1,4]]],"passed":true},{"actual":[[1],[[2]]],"check":"oracle 6","expected":[[0],[[1]]],"passed":false},{"actual":[[],[[]]],"check":"oracle 7","expected":[[],[[]]],"passed":true},{"actual":[[0,2],[[10,30],[1,3],[10,30],[1,3]]],"check":"variant packet 1","expected":[[1,3],[[20,40],[2,4],[20,40],[2,4]]],"passed":false}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"oracle 1\", \"actual\": [[0, 2], [[10, 30], [1, 3]]], \"expected\": [[1, 3], [[20, 40], [2, 4]]], \"passed\": false}, {\"check\": \"oracle 2\", \"actual\": [[0], [null]], \"expected\": [[3], [null]], \"passed\": false}, {\"check\": \"oracle 3\", \"actual\": [[], [[]]], \"expected\": [[], [[]]], \"passed\": true}, {\"check\": \"oracle 4\", \"actual\": [[2, 3], []], \"expected\": [[0, 1], []], \"passed\": false}, {\"check\": \"oracle 5\", \"actual\": [[0, 3], [[1, 4]]], \"expected\": [[0, 3], [[1, 4]]], \"passed\": true}, {\"check\": \"oracle 6\", \"actual\": [[1], [[2]]], \"expected\": [[0], [[1]]], \"passed\": false}, {\"check\": \"oracle 7\", \"actual\": [[], [[]]], \"expected\": [[], [[]]], \"passed\": true}, {\"check\": \"variant packet 1\", \"actual\": [[0, 2], [[10, 30], [1, 3], [10, 30], [1, 3]]], \"expected\": [[1, 3], [[20, 40], [2, 4], [20, 40], [2, 4]]], \"passed\": false}], \"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."}}