iot/labs/Demo/Demo/OnvifPage.xaml.cs

using Flurl;
using LibVLCSharp.Shared;
using System;
using System.Net.Http;
using Xamarin.Forms;
using Xamarin.Forms.Xaml;

namespace Demo
{
    [XamlCompilation(XamlCompilationOptions.Compile)]
    public partial class OnvifPage : ContentPage
    {
        private readonly string _url;
        private readonly LibVLC _libvlc;

        public OnvifPage(string url)
        {
            this._url = url;
            InitializeComponent();
            NavigationPage.SetHasNavigationBar(this, false);
            Core.Initialize();
            this._libvlc = new LibVLC();
            if (url.IndexOf("ptz") != -1)
            {
                this.left.Source = SetImage("left.png");
                this.right.Source = SetImage("right.png");
                this.up.Source = SetImage("up.png");
                this.down.Source = SetImage("down.png");
                this.zoomin.Source = SetImage("zoomin.png");
                this.zoomout.Source = SetImage("zoomout.png");
            }
            else
            {
                this.left.IsEnabled = false;
                this.right.IsEnabled = false;
                this.up.IsEnabled = false;
                this.down.IsEnabled = false;
                this.zoomin.IsEnabled = false;
                this.zoomout.IsEnabled = false;
            }
            this.back.Source = SetImage("back.png");
            this.mute.Source = SetImage("mute.png");
            this.volume.Value = 0;
        }

        protected override void OnAppearing()
        {
            var url = this._url.RemoveQueryParams("host", "node", "id", "ptz").ToString();
            var media = new Media(_libvlc, url, FromType.FromLocation);
            if (Device.RuntimePlatform == Device.Android)
            {
                media.AddOption(new MediaConfiguration() { EnableHardwareDecoding = true });
                media.AddOption(":network-caching=200");
                //media.AddOption(":clock-jitter=0");
                //media.AddOption(":clock-synchro=0");
            }
            var player = new MediaPlayer(_libvlc)
            {
                Volume = 0
            };
            videoView.MediaPlayer = player;
            player.Play(media);
        }

        protected override void OnDisappearing()
        {
            if (this.videoView.MediaPlayer.IsPlaying)
            {
                this.videoView.MediaPlayer.Stop();
            }
        }

        private void Back_Clicked(object sender, EventArgs e)
        {
            if (this.videoView.MediaPlayer.IsPlaying)
            {
                this.videoView.MediaPlayer.Stop();
            }
            this.Navigation.PopAsync();
        }

        private void Volume_ValueChanged(object sender, ValueChangedEventArgs e)
        {
            if (this.videoView?.MediaPlayer != null)
            {
                this.videoView.MediaPlayer.Volume = (int)e.NewValue;
                if (this.videoView.MediaPlayer.Volume == 0 && this.mute.Source.ClassId != "mute.png")
                {
                    this.mute.Source = SetImage("mute.png");
                }
                else if (this.mute.Source.ClassId != "volume.png")
                {
                    this.mute.Source = SetImage("volume.png");
                }
            }
        }

        private void Mute_Clicked(object sender, EventArgs e)
        {
            if (this.videoView?.MediaPlayer != null)
            {
                if (this.videoView.MediaPlayer.Volume == 0)
                {
                    this.volume.Value = 50;
                }
                else
                {
                    this.volume.Value = 0;
                }
            }
        }

        private void Control_Pressed(object sender, EventArgs e)
        {
            var videoUrl = new Url(this._url);
            var url = videoUrl.QueryParams["host"].ToString() + "/App/Exec/";
            url = url.SetQueryParam("node", videoUrl.QueryParams["node"]);
            url = url.SetQueryParam("id", videoUrl.QueryParams["id"]);
            var btn = sender as ImageButton;
            url = url.SetQueryParam("cmd", btn.ClassId);
            Console.WriteLine(url);
            var client = new HttpClient();
            client.GetAsync(url).Wait();
        }

        private void Control_Released(object sender, EventArgs e)
        {
            var videoUrl = new Url(this._url);
            var url = videoUrl.QueryParams["host"].ToString() + "/App/Exec/";
            url = url.SetQueryParam("node", videoUrl.QueryParams["node"]);
            url = url.SetQueryParam("id", videoUrl.QueryParams["id"]);
            url = url.SetQueryParam("cmd", "23stop");
            Console.WriteLine(url);
            var client = new HttpClient();
            client.GetAsync(url).Wait();
        }

        private ImageSource SetImage(string image)
        {
            var result = ImageSource.FromResource($"Demo.wwwroot.images.{image}");
            result.ClassId = image;
            return result;
        }
    }
}