Camera image stream parsing code.

MainForm.cs

//https://eaton-works.com/2023/11/14/telecom-camera-hack/

using ServiceStack.Text;

namespace CameraStreamApp;

public sealed partial class MainForm : Form
{
    private readonly Dictionary<string, PictureBox> cameras = new();

    public MainForm() => InitializeComponent();

    private sealed class CameraUpdate
    {
        public string ip { get; set; }

        public string image_name { get; set; }

        public string raw_image { get; set; }

        public string camera_no { get; set; }
    }

    private async void MainForm_Shown(object sender, EventArgs e)
    {
        var client = new HttpClient();

        using (var streamReader = new StreamReader(await client.GetStreamAsync("https://a-telecom-company.com/api/events/incident-events")))
        {
            while (true)
            {
                //Each stream line contains a new live image.
                var message = await streamReader.ReadLineAsync();
                if (string.IsNullOrEmpty(message)) continue;
                //Clean up the JSON a bit and then deserialize.
                var cu = JsonSerializer.DeserializeFromString<CameraUpdate>(message[7..^1].Replace("\\\"", "\"").Replace("\\n", string.Empty));
                if (cameras.TryGetValue(cu.camera_no, out var camera))
                {
                    //An existing camera has been found. Update the picture box in the UI with the latest live image.
                    if (string.IsNullOrEmpty(cu.raw_image)) continue;
                    using (var ms = new MemoryStream(Convert.FromBase64String(cu.raw_image)))
                    {
                        camera.Image = Image.FromStream(ms);
                    }
                }
                else
                {
                    //A new camera has been found. Add a picture box in the UI for it.
                    var pb = new PictureBox { Width = 400, Height = 300, Padding = new Padding(10), Dock = DockStyle.Top };
                    cameras.Add(cu.camera_no, pb);
                    CamerasPanel.Controls.Add(pb);
                    Text = $"A Telecom Company Video ({cameras.Count} Cameras)";
                    if (string.IsNullOrEmpty(cu.raw_image)) continue;
                    using (var ms = new MemoryStream(Convert.FromBase64String(cu.raw_image)))
                    {
                        pb.Image = Image.FromStream(ms);
                    }
                }
            }
        }
    }
}