Zebra Crossing Unity3D WebCam QR Decoder (multi-threaded)

ZXingScanner.cs

using ZXing;
using ZXing.Common;

using UnityEngine;

using System;
using System.Threading;
using System.Collections.Generic;

/// <summary>
/// Extremely basic usage of BarcodeDecoder in ZXing
/// library to actively decode QR codes from WebCam.
/// You may download ZXing C# binaries from:
/// http://zxingnet.codeplex.com/
/// This is tested with Unity3D 5.3.5f1
/// 
/// A Single threaded version of this class is available at:
/// https://gist.github.com/sepehr-laal/d52d0ee173c5c28d1f324729b35cb96a
/// 
/// Attach this script to an object in your scene and
/// hit play. If you hold a QR code in front of your
/// WebCam, its decoded string appears in "decodedResult"
/// </summary>
public class ZXingScanner : MonoBehaviour
{
    internal class Data
    {
        public Color32[] image;
        public int imageHeight;
        public int imageWidth;
    }

    public string decodedResult;
    WebCamTexture webCamTexture;
    BarcodeReader barcodeReader;
    Thread barcodeDecoderThread;
    TimeSpan barcodeThreadDelay;
    volatile bool stopSignal;
    volatile bool dataSignal;
    volatile Data data;

    void Start()
    {
        var formats = new List<BarcodeFormat>();
        formats.Add(BarcodeFormat.QR_CODE);

        barcodeReader = new BarcodeReader
        {
            AutoRotate = false,
            Options = new DecodingOptions
            {
                PossibleFormats = formats,
                TryHarder = true,
            }
        };

        webCamTexture = new WebCamTexture();
        webCamTexture.Play();

        data = new Data { image = null };
        dataSignal = true;
        stopSignal = false;

        barcodeThreadDelay = TimeSpan.FromMilliseconds(1);
        barcodeDecoderThread = new Thread(DecodeQR);
        barcodeDecoderThread.Start();
    }

    void Update()
    {
        if (webCamTexture != null && webCamTexture.isPlaying && dataSignal)
        {
            data.image = webCamTexture.GetPixels32();
            data.imageHeight = webCamTexture.height;
            data.imageWidth = webCamTexture.width;
            dataSignal = false;
        }
    }

    void DecodeQR()
    {
        while (!stopSignal)
        {
            if (!dataSignal)
            {
                Result result = barcodeReader.Decode(
                    data.image,
                    data.imageWidth,
                    data.imageHeight);

                if (result != null)
                    decodedResult = result.Text;

                dataSignal = true;
            }

            Thread.Sleep(barcodeThreadDelay);
        }
    }

    void OnDestroy()
    {
        if (webCamTexture != null)
            webCamTexture.Stop();

        stopSignal = true;
        barcodeDecoderThread.Join();
    }
}