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#!/usr/bin/env python3
"""TTS with per-sentence timing (karaoke captions).
Usage: tts-words.py <text> <voice> <out.mp3> <out.sentences.json>
Writes mp3 + JSON [{w, start, end}] (seconds, relative to segment start).
Uses edge-tts SentenceBoundary stream events.
"""
import asyncio
import json
import sys
import edge_tts
async def main(text: str, voice: str, mp3_path: str, sentences_path: str) -> None:
comm = edge_tts.Communicate(text, voice)
sentences = []
with open(mp3_path, "wb") as f:
async for chunk in comm.stream():
if chunk.get("type") == "audio":
f.write(chunk.get("data", b""))
elif chunk.get("type") == "SentenceBoundary":
start = chunk.get("offset", 0) / 1e7
dur = chunk.get("duration", 0) / 1e7
sentences.append(
{"w": chunk.get("text", ""), "start": round(start, 3), "end": round(start + dur, 3)}
)
with open(sentences_path, "w") as f:
json.dump(sentences, f)
if __name__ == "__main__":
asyncio.run(main(sys.argv[1], sys.argv[2], sys.argv[3], sys.argv[4]))