main.py

from fastapi import FastAPI, WebSocket, WebSocketDisconnect, Request
from fastapi.middleware.cors import CORSMiddleware
from fastapi.responses import JSONResponse, HTMLResponse
import sounddevice as sd
import numpy as np
import librosa
import joblib
import uvicorn
import threading
import asyncio
import logging
from typing import List

logging.basicConfig(level=logging.INFO)
logger = logging.getLogger(__name__)

app = FastAPI()

@app.get("/", response_class=HTMLResponse)
async def get(request: Request):
    logger.info("Saving the index page")
    with open("templates/index.html") as f:
        html_content = f.read()
    return HTMLResponse(content=html_content, status_code=200)

@app.get("/health")
def health_check():
    return {"status": "ok"}

app.add_middleware(
    CORSMiddleware,
    allow_origins=["*"],
    allow_credentials=True,
    allow_methods=["*"],
    allow_headers=["*"],
)

is_detecting = False
detection_thread = None

model = joblib.load('models/xgb_test.pkl')

class ConnectionManager:
    def __init__(self):
        self.active_connections: List[WebSocket] = []

    async def connect(self, websocket: WebSocket):
        await websocket.accept()
        self.active_connections.append(websocket)

    def disconnect(self, websocket: WebSocket):
        self.active_connections.remove(websocket)

    async def send_message(self, message: str):
        for connection in self.active_connections:
            await connection.send_text(message)

manager = ConnectionManager()

def extract_features(audio):
    sr = 16000

    mfccs = librosa.feature.mfcc(y=audio, sr=sr, n_mfcc=13)
    mfccs = np.mean(mfccs, axis=1)

    chroma = librosa.feature.chroma_stft(y=audio, sr=sr)
    chroma = np.mean(chroma, axis=1)

    contrast = librosa.feature.spectral_contrast(y=audio, sr=sr)
    contrast = np.mean(contrast, axis=1)

    centroid = librosa.feature.spectral_centroid(y=audio, sr=sr)
    centroid = np.mean(centroid, axis=1)

    combined_features = np.hstack([mfccs, chroma, contrast, centroid])
    return combined_features

async def process_audio_data(audio_data):
    audio_np = np.frombuffer(audio_data, dtype=np.float32)
    features = extract_features(audio_np)
    features = features.reshape(1, -1)
    prediction = model.predict(features)
    is_fake = prediction[0]

    result = 'fake' if is_fake else 'real'
    
    await manager.send_message(result)

@app.post("/start_detection")
async def start_detection():
    global is_detecting

    if not is_detecting:
        is_detecting = True
    return JSONResponse(content={'status': 'detection_started'})

@app.post("/stop_detection")
async def stop_detection():
    global is_detecting
    is_detecting = False
    return JSONResponse(content={'status': 'detection_stopped'})

@app.websocket("/ws")
async def websocket_endpoint(websocket: WebSocket):
    await manager.connect(websocket)
    try:
        while True:
            data = await websocket.receive_bytes()
            await process_audio_data(data)
    except WebSocketDisconnect:
        manager.disconnect(websocket)

if __name__ == '__main__':
    uvicorn.run(app, host="0.0.0.0", port=7860)