Fix chromecast sample and bump libvlc.ios version

Chromecast/Chromecast.iOS/Chromecast.iOS.csproj

@@ -154,7 +154,7 @@
       <Version>0.0.2</Version>
     </PackageReference>
     <PackageReference Include="VideoLAN.LibVLC.iOS">
-      <Version>3.0.0-alpha2</Version>
+      <Version>3.1.5-alpha</Version>
     </PackageReference>
     <PackageReference Include="Xamarin.Forms" Version="3.3.0.871608-pre2" />
   </ItemGroup>

Chromecast/Chromecast/MainPage.xaml.cs

 using LibVLCSharp.Shared;
+
 using System.Collections.Generic;
-using System.Diagnostics;
 using System.Linq;
 using System.Threading.Tasks;
+using static System.Diagnostics.Debug;
+
 using Xamarin.Forms;
+using System;
 
 namespace Chromecast
 {
@@ -28,7 +31,7 @@ namespace Chromecast
                 // start chromecast discovery
                 DiscoverChromecasts();
 
-                // hold on a bit
+                // hold on a bit at first to give libvlc time to find the chromecast
                 await Task.Delay(5000);
 
                 // start casting if any renderer found
@@ -42,24 +45,29 @@ namespace Chromecast
         private void StartCasting()
         {
             // abort casting if no renderer items were found
-            if (!_rendererItems.Any()) return;
+            if (!_rendererItems.Any())
+            {
+                WriteLine("No renderer items found. Abort casting...");
+                return;
+            }
 
             // create new media
             var media = new Media(_libVLC, 
                 "http://www.quirksmode.org/html5/videos/big_buck_bunny.mp4", 
                 Media.FromType.FromLocation);
 
-            // create the mediaplayer from the media
-            _mediaPlayer = new MediaPlayer(media);
+            // create the mediaplayer
+            _mediaPlayer = new MediaPlayer(_libVLC);
 
             // set the previously discovered renderer item (chromecast) on the mediaplayer
+            // if you set it to null, it will start to render normally (i.e. locally) again
             _mediaPlayer.SetRenderer(_rendererItems.First());
 
             // start the playback
             _mediaPlayer.Play(media);
         }
 
-        private void DiscoverChromecasts()
+        void DiscoverChromecasts()
         {
             // load native libvlc libraries
             Core.Initialize();
@@ -67,33 +75,36 @@ namespace Chromecast
             // create core libvlc object
             _libVLC = new LibVLC();
 
+            string rendererName;
+
+            // choose the correct service discovery protocol depending on the host platform
+            // Apple platforms use the Bonjour protocol
+            if (Device.RuntimePlatform == Device.iOS)
+                rendererName = _libVLC.RendererList.Select(renderer => renderer.Name).FirstOrDefault(name => name.Equals("Bonjour_renderer"));
+            else if (Device.RuntimePlatform == Device.Android)
+                rendererName = _libVLC.RendererList.Select(renderer => renderer.Name).FirstOrDefault(name => name.Equals("microdns_renderer"));
+            else throw new PlatformNotSupportedException("Only Android and iOS are currently supported in this sample");
+
             // create a renderer discoverer
-            _rendererDiscoverer = new RendererDiscoverer(_libVLC, _libVLC.RendererList[0].Name);
+            _rendererDiscoverer = new RendererDiscoverer(_libVLC, rendererName);
 
             // register callback when a new renderer is found
             _rendererDiscoverer.ItemAdded += RendererDiscoverer_ItemAdded;
 
             // start discovery on the local network
-            _rendererDiscoverer.Start();
-        }
-
-        private void _libVLC_Log(object sender, LogEventArgs e)
-        {
-            Debug.WriteLine(e.Message);
+            var r = _rendererDiscoverer.Start();
         }
 
         /// <summary>
         /// Raised when a renderer has been discovered or has been removed
         /// </summary>
-        /// <param name="sender"></param>
-        /// <param name="e"></param>
-        private void RendererDiscoverer_ItemAdded(object sender, RendererDiscovererItemAddedEventArgs e)
+        void RendererDiscoverer_ItemAdded(object sender, RendererDiscovererItemAddedEventArgs e)
         {
-            Debug.WriteLine($"New item discovered: {e.RendererItem.Name} of type {e.RendererItem.Type}");
+            WriteLine($"New item discovered: {e.RendererItem.Name} of type {e.RendererItem.Type}");
             if (e.RendererItem.CanRenderVideo)
-                Debug.WriteLine("Can render video");
+                WriteLine("Can render video");
             if (e.RendererItem.CanRenderAudio)
-                Debug.WriteLine("Can render audio");
+                WriteLine("Can render audio");
 
             // add newly found renderer item to local collection
             _rendererItems.Add(e.RendererItem);