app.py

# app.py
from flask import Flask, render_template, Response, jsonify, request
from camera import VideoCamera, STABILITY_SECONDS, CONF_THRESHOLD
import os
import time

app = Flask(__name__)
# Global instance of the video camera class
cam = None

# Ensure the camera is initialized only once
def get_camera():
    global cam
    if cam is None:
        try:
            cam = VideoCamera()
        except IOError as e:
            print(f"Failed to initialize camera: {e}")
            return None
    return cam

@app.route('/')
def index():
    """Video streaming home page."""
    # Pass settings to the frontend for display
    return render_template('index.html', 
                           stability_s=STABILITY_SECONDS, 
                           conf_thresh=CONF_THRESHOLD)

def gen(camera):
    """Video streaming generator function."""
    while True:
        frame = camera.get_frame()
        # Yield the frame in Motion JPEG format
        yield (b'--frame\r\n'
               b'Content-Type: image/jpeg\r\n\r\n' + frame + b'\r\n\r\n')
        # Control the frame rate (e.g., 30 FPS)
        time.sleep(1/30)

@app.route('/video_feed')
def video_feed():
    """Route to stream the video frame by frame."""
    camera = get_camera()
    if camera is None:
        return Response("Error: Camera not available.", status=500)
        
    return Response(gen(camera),
                    mimetype='multipart/x-mixed-replace; boundary=frame')

@app.route('/get_output')
def get_output():
    """API endpoint to check for new characters and append them."""
    camera = get_camera()
    if camera is None:
        return jsonify(output="", status="error")
        
    output = ""
    # Empty the queue, collecting all committed characters
    while not camera.output_queue.empty():
        try:
            output += camera.output_queue.get_nowait()
        except queue.Empty:
            break
            
    return jsonify(output=output, status="ok")

if __name__ == '__main__':
    # Ensure all model paths are valid before starting
    if not os.path.exists("project/Model"):
        print("ERROR: 'project/Model' directory not found. Please check paths.")
    else:
        # Start the Flask development server
        app.run(host='0.0.0.0', debug=False, threaded=True)