81 lines
5.4 KiB
Python
Executable File
81 lines
5.4 KiB
Python
Executable File
#!/usr/bin/env python3
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"""Create synthetic-only speech fixtures. Never accepts a recording or sends data to a provider.
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The random canaries and expected facts live in the local manifest only; the Dify
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probe sends the audio, schema and recording time but never this ground truth.
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Requires macOS say plus ffmpeg/ffprobe. Refuses to replace an existing manifest.
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"""
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import argparse
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import hashlib
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import json
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import pathlib
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import secrets
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import subprocess
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import tempfile
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def run(command):
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return subprocess.run(command, check=True, capture_output=True, text=True).stdout
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def duration(path):
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return float(run(["ffprobe", "-v", "error", "-show_entries", "format=duration", "-of", "default=nw=1:nk=1", str(path)]))
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def main():
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parser = argparse.ArgumentParser()
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parser.add_argument("--output", type=pathlib.Path, required=True)
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parser.add_argument("--voice", default="Tingting")
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args = parser.parse_args()
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output = args.output.resolve()
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if (output / "manifest.json").exists() or any((output / (case + ".mp3")).exists() for case in ("short", "medium", "long")):
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raise SystemExit("Fixture identity already exists; reuse it instead of regenerating or resubmitting.")
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output.mkdir(parents=True, exist_ok=True)
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output.chmod(0o700)
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manifest = {"generator": "followup-audio-synthetic-v1", "synthetic": True,
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"recorded_at": "2026-09-29 10:00:00", "speech_revision": "ordinary-dialogue-v2", "fixtures": []}
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words = ["紫色海豚", "水晶风车", "绿色蜻蜓", "银色树叶", "蓝色鲸鱼", "金色河流", "红色石榴", "白色云朵"]
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with tempfile.TemporaryDirectory(prefix="followup-audio-synthetic-") as temporary:
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temp = pathlib.Path(temporary)
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# Synthetic provenance stays in the manifest. The speech must not contradict
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# the expected task by declaring all reported measurements non-facts.
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middle_text = "客服说，电话里的声音还清楚吗？患者说，很清楚。客服说，好的，我们继续聊。患者说，好的，您说吧。"
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run(["say", "-v", args.voice, "-r", "190", "-o", str(temp / "middle.aiff"), middle_text])
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for case, seconds, systolic, diastolic in (("short", 60, 131, 86), ("medium", 900, 139, 88), ("long", 3598, 147, 91)):
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head_canary = "".join(secrets.SystemRandom().sample(words, 3))
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tail_canary = "".join(secrets.SystemRandom().sample(words, 3))
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while tail_canary == head_canary:
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tail_canary = "".join(secrets.SystemRandom().sample(words, 3))
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head = f"患者说，我先读三个词，{head_canary}。昨天晚上九点，我测的血压是收缩压一百二十六，舒张压八十二。前天下午两点，我测的餐后血糖是七点二。"
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tail = f"患者说，我再补充一次测量。今天早晨七点，我的收缩压是{systolic}，舒张压是{diastolic}。最后再读三个词，{tail_canary}。客服说，好的，再见。"
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run(["say", "-v", args.voice, "-r", "190", "-o", str(temp / "head.aiff"), head])
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run(["say", "-v", args.voice, "-r", "190", "-o", str(temp / "tail.aiff"), tail])
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filler_seconds = seconds - duration(temp / "head.aiff") - duration(temp / "tail.aiff")
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if filler_seconds <= 0:
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raise SystemExit("Speech is longer than short fixture; increase speaking rate or duration")
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path = output / (case + ".mp3")
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filters = f"[0:a]aresample=16000,aformat=channel_layouts=mono[h];[1:a]aresample=16000,aformat=channel_layouts=mono,atrim=duration={filler_seconds},asetpts=PTS-STARTPTS[m];[2:a]aresample=16000,aformat=channel_layouts=mono[t];[h][m][t]concat=n=3:v=0:a=1[out]"
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run(["ffmpeg", "-nostdin", "-hide_banner", "-loglevel", "error", "-i", str(temp / "head.aiff"),
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"-stream_loop", "-1", "-i", str(temp / "middle.aiff"), "-i", str(temp / "tail.aiff"),
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"-filter_complex", filters, "-map", "[out]", "-t", str(seconds), "-codec:a", "libmp3lame", "-b:a", "32k", "-y", str(path)])
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path.chmod(0o600)
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actual = duration(path)
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sha = hashlib.file_digest(path.open("rb"), "sha256").hexdigest()
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manifest["fixtures"].append({"case": case, "file": path.name, "sha256": sha, "duration_seconds": actual,
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"synthetic": True, "generator": manifest["generator"], "expected": {"canaries": [head_canary, tail_canary], "facts": [
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{"kind": "blood", "record_date": "2026-09-28", "record_time": "21:00", "values": {"systolic_pressure": 126, "diastolic_pressure": 82}},
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{"kind": "blood", "record_date": "2026-09-27", "record_time": "14:00", "values": {"postprandial_blood_sugar": 7.2}},
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{"kind": "blood", "record_date": "2026-09-29", "record_time": "07:00", "values": {"systolic_pressure": systolic, "diastolic_pressure": diastolic}},
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]}})
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print(json.dumps({"case": case, "path": str(path), "duration_seconds": actual, "sha256": sha, "synthetic": True}))
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manifest_path = output / "manifest.json"
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manifest_path.write_text(json.dumps(manifest, ensure_ascii=False, indent=2) + "\n")
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manifest_path.chmod(0o600)
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reopened = json.loads(manifest_path.read_text())
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assert len(reopened["fixtures"]) == 3
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print(json.dumps({"manifest": str(manifest_path), "synthetic": True, "fixtures": 3}))
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if __name__ == "__main__":
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main()
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