{"abstract":"Inactive physical slots are mistaken for dense PCM channels.","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.","evaluation_group":"s3-pcm-pcm-tdm-active-slots","failed_approach":"Reversing selected channels changes the declared ascending-slot order.","family":"s3-pcm-pcm-tdm-active-slots-active-selection","id":"FA-50006","implementations":{"attempt":{"sha256":"f5641dda6072d44dac7d0f1d7b53fff569109ccc9d5576b123b7f2e20f3816a9","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<<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 reversed(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":"eb5c2772d42548310d249035d158443dfc404562ff08cd158aa0748f328bc7d7","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<<i)]\n    out=[]\n    for frame in frames:\n        if len(frame)<slots:\n            out.append(None)\n            continue\n        out.append(list(frame[:len(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"},"fixed":{"sha256":"f7693ccfc98bcfd5d45aa20328bb98c97199afaebe2b84622681230993d219e2","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<<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-active-selection","generated_at":"2026-09-29T14:45:05.132519+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 active selection.","root_cause":"Inactive physical slots are mistaken for dense PCM channels.","sha256":"f869490782fa307e19ee83a8f48c9c0c3dc4675174a3009af0b0ec68bc2a7617","title":"Pcm tdm active slots: active selection · case 01","variant":1,"variant_policy":"Five numbered records share a model and may reuse boundary fixtures.","verification":{"attempt":{"elapsed_ms":39.811,"exit_code":1,"observations":[{"actual":[[1,3],[[40,20],[4,2]]],"check":"oracle 1","expected":[[1,3],[[20,40],[2,4]]],"passed":false},{"actual":[[3],[null]],"check":"oracle 2","expected":[[3],[null]],"passed":true},{"actual":[[],[[]]],"check":"oracle 3","expected":[[],[[]]],"passed":true},{"actual":[[0,1],[]],"check":"oracle 4","expected":[[0,1],[]],"passed":true},{"actual":[[0,3],[[4,1]]],"check":"oracle 5","expected":[[0,3],[[1,4]]],"passed":false},{"actual":[[0],[[1]]],"check":"oracle 6","expected":[[0],[[1]]],"passed":true},{"actual":[[],[[]]],"check":"oracle 7","expected":[[],[[]]],"passed":true},{"actual":[[1,3],[[40,20],[4,2],[40,20],[4,2]]],"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\": [[1, 3], [[40, 20], [4, 2]]], \"expected\": [[1, 3], [[20, 40], [2, 4]]], \"passed\": false}, {\"check\": \"oracle 2\", \"actual\": [[3], [null]], \"expected\": [[3], [null]], \"passed\": true}, {\"check\": \"oracle 3\", \"actual\": [[], [[]]], \"expected\": [[], [[]]], \"passed\": true}, {\"check\": \"oracle 4\", \"actual\": [[0, 1], []], \"expected\": [[0, 1], []], \"passed\": true}, {\"check\": \"oracle 5\", \"actual\": [[0, 3], [[4, 1]]], \"expected\": [[0, 3], [[1, 4]]], \"passed\": false}, {\"check\": \"oracle 6\", \"actual\": [[0], [[1]]], \"expected\": [[0], [[1]]], \"passed\": true}, {\"check\": \"oracle 7\", \"actual\": [[], [[]]], \"expected\": [[], [[]]], \"passed\": true}, {\"check\": \"variant packet 1\", \"actual\": [[1, 3], [[40, 20], [4, 2], [40, 20], [4, 2]]], \"expected\": [[1, 3], [[20, 40], [2, 4], [20, 40], [2, 4]]], \"passed\": false}], \"passed\": false}\n"},"broken":{"elapsed_ms":37.819,"exit_code":1,"observations":[{"actual":[[1,3],[[10,20],[1,2]]],"check":"oracle 1","expected":[[1,3],[[20,40],[2,4]]],"passed":false},{"actual":[[3],[null]],"check":"oracle 2","expected":[[3],[null]],"passed":true},{"actual":[[],[[]]],"check":"oracle 3","expected":[[],[[]]],"passed":true},{"actual":[[0,1],[]],"check":"oracle 4","expected":[[0,1],[]],"passed":true},{"actual":[[0,3],[[1,2]]],"check":"oracle 5","expected":[[0,3],[[1,4]]],"passed":false},{"actual":[[0],[[1]]],"check":"oracle 6","expected":[[0],[[1]]],"passed":true},{"actual":[[],[[]]],"check":"oracle 7","expected":[[],[[]]],"passed":true},{"actual":[[1,3],[[10,20],[1,2],[10,20],[1,2]]],"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\": [[1, 3], [[10, 20], [1, 2]]], \"expected\": [[1, 3], [[20, 40], [2, 4]]], \"passed\": false}, {\"check\": \"oracle 2\", \"actual\": [[3], [null]], \"expected\": [[3], [null]], \"passed\": true}, {\"check\": \"oracle 3\", \"actual\": [[], [[]]], \"expected\": [[], [[]]], \"passed\": true}, {\"check\": \"oracle 4\", \"actual\": [[0, 1], []], \"expected\": [[0, 1], []], \"passed\": true}, {\"check\": \"oracle 5\", \"actual\": [[0, 3], [[1, 2]]], \"expected\": [[0, 3], [[1, 4]]], \"passed\": false}, {\"check\": \"oracle 6\", \"actual\": [[0], [[1]]], \"expected\": [[0], [[1]]], \"passed\": true}, {\"check\": \"oracle 7\", \"actual\": [[], [[]]], \"expected\": [[], [[]]], \"passed\": true}, {\"check\": \"variant packet 1\", \"actual\": [[1, 3], [[10, 20], [1, 2], [10, 20], [1, 2]]], \"expected\": [[1, 3], [[20, 40], [2, 4], [20, 40], [2, 4]]], \"passed\": false}], \"passed\": false}\n"},"fixed":{"elapsed_ms":37.488,"exit_code":0,"observations":[{"actual":[[1,3],[[20,40],[2,4]]],"check":"oracle 1","expected":[[1,3],[[20,40],[2,4]]],"passed":true},{"actual":[[3],[null]],"check":"oracle 2","expected":[[3],[null]],"passed":true},{"actual":[[],[[]]],"check":"oracle 3","expected":[[],[[]]],"passed":true},{"actual":[[0,1],[]],"check":"oracle 4","expected":[[0,1],[]],"passed":true},{"actual":[[0,3],[[1,4]]],"check":"oracle 5","expected":[[0,3],[[1,4]]],"passed":true},{"actual":[[0],[[1]]],"check":"oracle 6","expected":[[0],[[1]]],"passed":true},{"actual":[[],[[]]],"check":"oracle 7","expected":[[],[[]]],"passed":true},{"actual":[[1,3],[[20,40],[2,4],[20,40],[2,4]]],"check":"variant packet 1","expected":[[1,3],[[20,40],[2,4],[20,40],[2,4]]],"passed":true}],"passed":true,"stderr":"","stdout":"{\"observations\": [{\"check\": \"oracle 1\", \"actual\": [[1, 3], [[20, 40], [2, 4]]], \"expected\": [[1, 3], [[20, 40], [2, 4]]], \"passed\": true}, {\"check\": \"oracle 2\", \"actual\": [[3], [null]], \"expected\": [[3], [null]], \"passed\": true}, {\"check\": \"oracle 3\", \"actual\": [[], [[]]], \"expected\": [[], [[]]], \"passed\": true}, {\"check\": \"oracle 4\", \"actual\": [[0, 1], []], \"expected\": [[0, 1], []], \"passed\": true}, {\"check\": \"oracle 5\", \"actual\": [[0, 3], [[1, 4]]], \"expected\": [[0, 3], [[1, 4]]], \"passed\": true}, {\"check\": \"oracle 6\", \"actual\": [[0], [[1]]], \"expected\": [[0], [[1]]], \"passed\": true}, {\"check\": \"oracle 7\", \"actual\": [[], [[]]], \"expected\": [[], [[]]], \"passed\": true}, {\"check\": \"variant packet 1\", \"actual\": [[1, 3], [[20, 40], [2, 4], [20, 40], [2, 4]]], \"expected\": [[1, 3], [[20, 40], [2, 4], [20, 40], [2, 4]]], \"passed\": true}], \"passed\": true}\n"}},"verified":true,"visibility":"public"}