{"abstract":"Silence runs use integer zero despite an explicit unsigned PCM zero code.","category":"PCM sample encoding","checks":8,"contract":"Decode tagged PCM literal and silence-run packets up to a sample capacity, honoring the declared digital-silence code and skipping unknown metadata.","contract_signature":"packets, zero, limit","evaluation_group":"s3-pcm-pcm-silence-run-packets","failed_approach":"Holding the last amplitude creates a DC segment instead of silence.","family":"s3-pcm-pcm-silence-run-packets-silence-code","id":"FA-49391","implementations":{"attempt":{"sha256":"9a8cc524d60dd1ae439b26c867787d1e1385e760e2ea9ac159f9e96ae8a68e43","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\n\nN = 1\nobservations = []\ndef solve(packets, zero, limit):\n    out=[]\n    for tag,payload in packets:\n        if tag=='audio':\n            out.extend(payload)\n        elif tag=='silence':\n            out.extend([out[-1] if out else zero]*max(0,payload))\n        else:\n            continue\n        if len(out)>=limit:\n            out=out[:limit]\n            break\n    return out\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\ncheck('oracle 1', solve(*([['audio', [130, 131]], ['silence', 2], ['audio', [129]]], 128, 8)), [130, 131, 128, 128, 129])\ncheck('oracle 2', solve(*([['silence', 0], ['audio', [5]]], 128, 5)), [5])\ncheck('oracle 3', solve(*([['metadata', []], ['audio', [1, 2]]], 0, 4)), [1, 2])\ncheck('oracle 4', solve(*([['audio', [1, 2, 3]], ['silence', 2]], 0, 2)), [1, 2])\ncheck('oracle 5', solve(*([], 128, 5)), [])\ncheck('oracle 6', solve(*([['silence', -1], ['silence', 2]], 128, 3)), [128, 128])\ncheck('oracle 7', solve(*([['audio', [1]], ['audio', [2]]], 0, 0)), [])\nif N == 1: check('variant packet 1', solve(*[[['audio', [130, 131]], ['silence', 2], ['audio', [129]], ['audio', [130, 131]], ['silence', 2], ['audio', [129]]], 128, 16]), [130, 131, 128, 128, 129, 130, 131, 128, 128, 129])\nif N == 2: check('variant packet 2', solve(*[[['audio', [130, 131]], ['silence', 2], ['audio', [129]], ['audio', [130, 131]], ['silence', 2], ['audio', [129]], ['audio', [130, 131]], ['silence', 2], ['audio', [129]]], 128, 24]), [130, 131, 128, 128, 129, 130, 131, 128, 128, 129, 130, 131, 128, 128, 129])\nif N == 3: check('variant packet 3', solve(*[[['audio', [130, 131]], ['silence', 2], ['audio', [129]], ['audio', [130, 131]], ['silence', 2], ['audio', [129]], ['audio', [130, 131]], ['silence', 2], ['audio', [129]], ['audio', [130, 131]], ['silence', 2], ['audio', [129]]], 128, 32]), [130, 131, 128, 128, 129, 130, 131, 128, 128, 129, 130, 131, 128, 128, 129, 130, 131, 128, 128, 129])\nif N == 4: check('variant packet 4', solve(*[[['audio', [130, 131]], ['silence', 2], ['audio', [129]], ['audio', [130, 131]], ['silence', 2], ['audio', [129]], ['audio', [130, 131]], ['silence', 2], ['audio', [129]], ['audio', [130, 131]], ['silence', 2], ['audio', [129]], ['audio', [130, 131]], ['silence', 2], ['audio', [129]]], 128, 40]), [130, 131, 128, 128, 129, 130, 131, 128, 128, 129, 130, 131, 128, 128, 129, 130, 131, 128, 128, 129, 130, 131, 128, 128, 129])\nif N == 5: check('variant packet 5', solve(*[[['audio', [130, 131]], ['silence', 2], ['audio', [129]], ['audio', [130, 131]], ['silence', 2], ['audio', [129]], ['audio', [130, 131]], ['silence', 2], ['audio', [129]], ['audio', [130, 131]], ['silence', 2], ['audio', [129]], ['audio', [130, 131]], ['silence', 2], ['audio', [129]], ['audio', [130, 131]], ['silence', 2], ['audio', [129]]], 128, 48]), [130, 131, 128, 128, 129, 130, 131, 128, 128, 129, 130, 131, 128, 128, 129, 130, 131, 128, 128, 129, 130, 131, 128, 128, 129, 130, 131, 128, 128, 129])\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":"ab2db2b0930cb9edc2251ec97cad7d20bd126a5312f0920cfda928bd85ef66b4","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\n\nN = 1\nobservations = []\ndef solve(packets, zero, limit):\n    out=[]\n    for tag,payload in packets:\n        if tag=='audio':\n            out.extend(payload)\n        elif tag=='silence':\n            out.extend([0]*max(0,payload))\n        else:\n            continue\n        if len(out)>=limit:\n            out=out[:limit]\n            break\n    return out\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\ncheck('oracle 1', solve(*([['audio', [130, 131]], ['silence', 2], ['audio', [129]]], 128, 8)), [130, 131, 128, 128, 129])\ncheck('oracle 2', solve(*([['silence', 0], ['audio', [5]]], 128, 5)), [5])\ncheck('oracle 3', solve(*([['metadata', []], ['audio', [1, 2]]], 0, 4)), [1, 2])\ncheck('oracle 4', solve(*([['audio', [1, 2, 3]], ['silence', 2]], 0, 2)), [1, 2])\ncheck('oracle 5', solve(*([], 128, 5)), [])\ncheck('oracle 6', solve(*([['silence', -1], ['silence', 2]], 128, 3)), [128, 128])\ncheck('oracle 7', solve(*([['audio', [1]], ['audio', [2]]], 0, 0)), [])\nif N == 1: check('variant packet 1', solve(*[[['audio', [130, 131]], ['silence', 2], ['audio', [129]], ['audio', [130, 131]], ['silence', 2], ['audio', [129]]], 128, 16]), [130, 131, 128, 128, 129, 130, 131, 128, 128, 129])\nif N == 2: check('variant packet 2', solve(*[[['audio', [130, 131]], ['silence', 2], ['audio', [129]], ['audio', [130, 131]], ['silence', 2], ['audio', [129]], ['audio', [130, 131]], ['silence', 2], ['audio', [129]]], 128, 24]), [130, 131, 128, 128, 129, 130, 131, 128, 128, 129, 130, 131, 128, 128, 129])\nif N == 3: check('variant packet 3', solve(*[[['audio', [130, 131]], ['silence', 2], ['audio', [129]], ['audio', [130, 131]], ['silence', 2], ['audio', [129]], ['audio', [130, 131]], ['silence', 2], ['audio', [129]], ['audio', [130, 131]], ['silence', 2], ['audio', [129]]], 128, 32]), [130, 131, 128, 128, 129, 130, 131, 128, 128, 129, 130, 131, 128, 128, 129, 130, 131, 128, 128, 129])\nif N == 4: check('variant packet 4', solve(*[[['audio', [130, 131]], ['silence', 2], ['audio', [129]], ['audio', [130, 131]], ['silence', 2], ['audio', [129]], ['audio', [130, 131]], ['silence', 2], ['audio', [129]], ['audio', [130, 131]], ['silence', 2], ['audio', [129]], ['audio', [130, 131]], ['silence', 2], ['audio', [129]]], 128, 40]), [130, 131, 128, 128, 129, 130, 131, 128, 128, 129, 130, 131, 128, 128, 129, 130, 131, 128, 128, 129, 130, 131, 128, 128, 129])\nif N == 5: check('variant packet 5', solve(*[[['audio', [130, 131]], ['silence', 2], ['audio', [129]], ['audio', [130, 131]], ['silence', 2], ['audio', [129]], ['audio', [130, 131]], ['silence', 2], ['audio', [129]], ['audio', [130, 131]], ['silence', 2], ['audio', [129]], ['audio', [130, 131]], ['silence', 2], ['audio', [129]], ['audio', [130, 131]], ['silence', 2], ['audio', [129]]], 128, 48]), [130, 131, 128, 128, 129, 130, 131, 128, 128, 129, 130, 131, 128, 128, 129, 130, 131, 128, 128, 129, 130, 131, 128, 128, 129, 130, 131, 128, 128, 129])\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-silence-run-packets-silence-code","generated_at":"2026-09-29T14:44:59.738462+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":"Silence runs use integer zero despite an explicit unsigned PCM zero code.","sha256":"5e1b81f8279dce1d818c1391e8d9cc68f3cf2dfd6b7fabb8ac5dbe33d84f7b32","title":"Pcm silence run packets: silence code · 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":41.841,"exit_code":1,"observations":[{"actual":[130,131,131,131,129],"check":"oracle 1","expected":[130,131,128,128,129],"passed":false},{"actual":[5],"check":"oracle 2","expected":[5],"passed":true},{"actual":[1,2],"check":"oracle 3","expected":[1,2],"passed":true},{"actual":[1,2],"check":"oracle 4","expected":[1,2],"passed":true},{"actual":[],"check":"oracle 5","expected":[],"passed":true},{"actual":[128,128],"check":"oracle 6","expected":[128,128],"passed":true},{"actual":[],"check":"oracle 7","expected":[],"passed":true},{"actual":[130,131,131,131,129,130,131,131,131,129],"check":"variant packet 1","expected":[130,131,128,128,129,130,131,128,128,129],"passed":false}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"oracle 1\", \"actual\": [130, 131, 131, 131, 129], \"expected\": [130, 131, 128, 128, 129], \"passed\": false}, {\"check\": \"oracle 2\", \"actual\": [5], \"expected\": [5], \"passed\": true}, {\"check\": \"oracle 3\", \"actual\": [1, 2], \"expected\": [1, 2], \"passed\": true}, {\"check\": \"oracle 4\", \"actual\": [1, 2], \"expected\": [1, 2], \"passed\": true}, {\"check\": \"oracle 5\", \"actual\": [], \"expected\": [], \"passed\": true}, {\"check\": \"oracle 6\", \"actual\": [128, 128], \"expected\": [128, 128], \"passed\": true}, {\"check\": \"oracle 7\", \"actual\": [], \"expected\": [], \"passed\": true}, {\"check\": \"variant packet 1\", \"actual\": [130, 131, 131, 131, 129, 130, 131, 131, 131, 129], \"expected\": [130, 131, 128, 128, 129, 130, 131, 128, 128, 129], \"passed\": false}], \"passed\": false}\n"},"broken":{"elapsed_ms":39.177,"exit_code":1,"observations":[{"actual":[130,131,0,0,129],"check":"oracle 1","expected":[130,131,128,128,129],"passed":false},{"actual":[5],"check":"oracle 2","expected":[5],"passed":true},{"actual":[1,2],"check":"oracle 3","expected":[1,2],"passed":true},{"actual":[1,2],"check":"oracle 4","expected":[1,2],"passed":true},{"actual":[],"check":"oracle 5","expected":[],"passed":true},{"actual":[0,0],"check":"oracle 6","expected":[128,128],"passed":false},{"actual":[],"check":"oracle 7","expected":[],"passed":true},{"actual":[130,131,0,0,129,130,131,0,0,129],"check":"variant packet 1","expected":[130,131,128,128,129,130,131,128,128,129],"passed":false}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"oracle 1\", \"actual\": [130, 131, 0, 0, 129], \"expected\": [130, 131, 128, 128, 129], \"passed\": false}, {\"check\": \"oracle 2\", \"actual\": [5], \"expected\": [5], \"passed\": true}, {\"check\": \"oracle 3\", \"actual\": [1, 2], \"expected\": [1, 2], \"passed\": true}, {\"check\": \"oracle 4\", \"actual\": [1, 2], \"expected\": [1, 2], \"passed\": true}, {\"check\": \"oracle 5\", \"actual\": [], \"expected\": [], \"passed\": true}, {\"check\": \"oracle 6\", \"actual\": [0, 0], \"expected\": [128, 128], \"passed\": false}, {\"check\": \"oracle 7\", \"actual\": [], \"expected\": [], \"passed\": true}, {\"check\": \"variant packet 1\", \"actual\": [130, 131, 0, 0, 129, 130, 131, 0, 0, 129], \"expected\": [130, 131, 128, 128, 129, 130, 131, 128, 128, 129], \"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."}}