app.py

import os
import uuid
import torch
import soundfile as sf
from fastapi import FastAPI, File, UploadFile, Form
from fastapi.responses import FileResponse
from TTS.api import TTS

app = FastAPI(title="XTTS Voice Cloning API")

# Load model once (VERY IMPORTANT)
device = "cuda" if torch.cuda.is_available() else "cpu"

tts = TTS(
    model_name="tts_models/multilingual/multi-dataset/xtts_v2"
).to(device)

OUTPUT_DIR = "outputs"
os.makedirs(OUTPUT_DIR, exist_ok=True)


@app.post("/clone-voice/")
async def clone_voice(
    text: str = Form(...),
    language: str = Form(...),
    audio: UploadFile = File(...)
):
    try:
        # Save uploaded audio
        input_path = f"{OUTPUT_DIR}/{uuid.uuid4()}_input.wav"
        with open(input_path, "wb") as f:
            f.write(await audio.read())

        # Output file
        output_path = f"{OUTPUT_DIR}/{uuid.uuid4()}_output.wav"

        # Generate speech
        tts.tts_to_file(
            text=text,
            speaker_wav=input_path,
            language=language,
            file_path=output_path
        )

        return FileResponse(output_path, media_type="audio/wav")

    except Exception as e:
        return {"error": str(e)}