{"abstract":"The transport clock advances while playback is paused.","category":"Audio playback scheduling","checks":4,"contract":"Advance a nonnegative playback frame cursor by rendered frames only when not paused.","contract_signature":"position, frames, paused","evaluation_group":"xaud-playback-pause-freezes-position","failed_approach":"Replacing position with block length loses cumulative playback progress.","family":"xaud-playback-pause-freezes-position","id":"FA-10956","implementations":{"attempt":{"sha256":"2cde6fbd8b96fa2fdfffea8c75ac954fc11f489609372325d094a3589966ec0b","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\nimport math\nN = 1\nobservations = []\ndef solve(position, frames, paused):\n    return position if paused else frames\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\ncheck('fixture 1',solve(*(10, 4, True)),10)\ncheck('fixture 2',solve(*(10, 4, False)),14)\ncheck('fixture 3',solve(*(0, 0, False)),0)\ncheck('fixture 4',solve(*(3, 0, True)),3)\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":"37c0c7a77649497760bc04172316aa7b8ff4dc744632ad45aa139fd2c956b013","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\nimport math\nN = 1\nobservations = []\ndef solve(position, frames, paused):\n    return position+frames\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\ncheck('fixture 1',solve(*(10, 4, True)),10)\ncheck('fixture 2',solve(*(10, 4, False)),14)\ncheck('fixture 3',solve(*(0, 0, False)),0)\ncheck('fixture 4',solve(*(3, 0, True)),3)\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":" 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":"xaud-playback-pause-freezes-position","generated_at":"2026-09-29T14:38:43.717654+00:00","license":"CC0-1.0","python":"3.12.14","seed":1,"split":"open-access"},"relevance":"A pure Python local audio pipeline stage with explicit sample formats and frame conventions; no real-time device or signal-spectrum claims.","root_cause":"The transport clock advances while playback is paused.","sha256":"5749a9f50fe51d4d7d6f39e6ae528469654cffe91a5575528cdf1c86d9aea3fa","title":"Playback pause freezes position · 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":40.438,"exit_code":1,"observations":[{"actual":10,"check":"fixture 1","expected":10,"passed":true},{"actual":4,"check":"fixture 2","expected":14,"passed":false},{"actual":0,"check":"fixture 3","expected":0,"passed":true},{"actual":3,"check":"fixture 4","expected":3,"passed":true}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"fixture 1\", \"actual\": 10, \"expected\": 10, \"passed\": true}, {\"check\": \"fixture 2\", \"actual\": 4, \"expected\": 14, \"passed\": false}, {\"check\": \"fixture 3\", \"actual\": 0, \"expected\": 0, \"passed\": true}, {\"check\": \"fixture 4\", \"actual\": 3, \"expected\": 3, \"passed\": true}], \"passed\": false}\n"},"broken":{"elapsed_ms":38.741,"exit_code":1,"observations":[{"actual":14,"check":"fixture 1","expected":10,"passed":false},{"actual":14,"check":"fixture 2","expected":14,"passed":true},{"actual":0,"check":"fixture 3","expected":0,"passed":true},{"actual":3,"check":"fixture 4","expected":3,"passed":true}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"fixture 1\", \"actual\": 14, \"expected\": 10, \"passed\": false}, {\"check\": \"fixture 2\", \"actual\": 14, \"expected\": 14, \"passed\": true}, {\"check\": \"fixture 3\", \"actual\": 0, \"expected\": 0, \"passed\": true}, {\"check\": \"fixture 4\", \"actual\": 3, \"expected\": 3, \"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."}}