{"abstract":"Frame offsets and lengths are applied as individual sample offsets.","category":"Audio frame buffers","checks":4,"contract":"Return count complete frames from in-bounds frame offset start in interleaved PCM with positive channel count.","contract_signature":"samples, channels, start, count","evaluation_group":"xaud-frame-slice-multiplies-channel-stride","failed_approach":"Scaling only the start still truncates each multichannel frame count.","family":"xaud-frame-slice-multiplies-channel-stride","id":"FA-10836","implementations":{"attempt":{"sha256":"c6601c5b5761636e5ad4272a85289218a7407dcc459a250f02aa73a2acd1b4e4","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\nimport math\nN = 1\nobservations = []\ndef solve(samples, channels, start, count):\n    return samples[start*channels:start*channels+count]\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\ncheck('fixture 1',solve(*([1, 2, 3, 4, 5, 6], 2, 1, 2)),[3, 4, 5, 6])\ncheck('fixture 2',solve(*([1, 2], 2, 0, 1)),[1, 2])\ncheck('fixture 3',solve(*([1, 2], 2, 1, 0)),[])\ncheck('fixture 4',solve(*([1, 2, 3], 1, 1, 1)),[2])\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":"a4e67be6088409b1f5713b9d2bb8a67d21168e63dd57fac978c4df469a04814a","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\nimport math\nN = 1\nobservations = []\ndef solve(samples, channels, start, count):\n    return samples[start:start+count]\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\ncheck('fixture 1',solve(*([1, 2, 3, 4, 5, 6], 2, 1, 2)),[3, 4, 5, 6])\ncheck('fixture 2',solve(*([1, 2], 2, 0, 1)),[1, 2])\ncheck('fixture 3',solve(*([1, 2], 2, 1, 0)),[])\ncheck('fixture 4',solve(*([1, 2, 3], 1, 1, 1)),[2])\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-frame-slice-multiplies-channel-stride","generated_at":"2026-09-29T14:38:42.617534+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":"Frame offsets and lengths are applied as individual sample offsets.","sha256":"66c836d5302a9ece4b6357d8ca05b503913285e8c2fcacdf2d213d8accfadc77","title":"Frame slice multiplies channel stride · 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":40.354,"exit_code":1,"observations":[{"actual":[3,4],"check":"fixture 1","expected":[3,4,5,6],"passed":false},{"actual":[1],"check":"fixture 2","expected":[1,2],"passed":false},{"actual":[],"check":"fixture 3","expected":[],"passed":true},{"actual":[2],"check":"fixture 4","expected":[2],"passed":true}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"fixture 1\", \"actual\": [3, 4], \"expected\": [3, 4, 5, 6], \"passed\": false}, {\"check\": \"fixture 2\", \"actual\": [1], \"expected\": [1, 2], \"passed\": false}, {\"check\": \"fixture 3\", \"actual\": [], \"expected\": [], \"passed\": true}, {\"check\": \"fixture 4\", \"actual\": [2], \"expected\": [2], \"passed\": true}], \"passed\": false}\n"},"broken":{"elapsed_ms":39.259,"exit_code":1,"observations":[{"actual":[2,3],"check":"fixture 1","expected":[3,4,5,6],"passed":false},{"actual":[1],"check":"fixture 2","expected":[1,2],"passed":false},{"actual":[],"check":"fixture 3","expected":[],"passed":true},{"actual":[2],"check":"fixture 4","expected":[2],"passed":true}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"fixture 1\", \"actual\": [2, 3], \"expected\": [3, 4, 5, 6], \"passed\": false}, {\"check\": \"fixture 2\", \"actual\": [1], \"expected\": [1, 2], \"passed\": false}, {\"check\": \"fixture 3\", \"actual\": [], \"expected\": [], \"passed\": true}, {\"check\": \"fixture 4\", \"actual\": [2], \"expected\": [2], \"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."}}