Issue #409 PReventShutdown to ElementHostBase

README.md

@@ -13,9 +13,9 @@
 
 ## Current NuGet Release Status
 - If you would like to support this project, you can show your appreciation via [PayPal.Me](https://www.paypal.me/mariodivece/50usd)
-- Current Status: (2019-04-19) - Release 4.1.300 is now available, (see the <a href="https://github.com/unosquare/ffmediaelement/releases">Releases</a>)
+- Current Status: (2019-06-30) - Release 4.1.310 is now available, (see the <a href="https://github.com/unosquare/ffmediaelement/releases">Releases</a>)
 - NuGet Package available here: https://www.nuget.org/packages/FFME.Windows/
-- FFmpeg Version: 4.1.1 <a href="https://ffmpeg.zeranoe.com/builds/win32/shared/ffmpeg-4.1.1-win32-shared.zip">32-bit</a> or <a href="https://ffmpeg.zeranoe.com/builds/win64/shared/ffmpeg-4.1.1-win64-shared.zip">64-bit</a>
+- FFmpeg Version: 4.1.3 <a href="https://ffmpeg.zeranoe.com/builds/win32/shared/ffmpeg-4.1.3-win32-shared.zip">32-bit</a> or <a href="https://ffmpeg.zeranoe.com/builds/win64/shared/ffmpeg-4.1.3-win64-shared.zip">64-bit</a>
 
 *Please note the current NuGet realease might require a different version of the FFmpeg binaries than the ones of the current state of the source code.*
 
@@ -94,7 +94,7 @@ A high-level diagram is provided as additional reference below.
 *Please note that I am unable to distribute FFmpeg's binaries because I don't know if I am allowed to do so. Follow the instructions below to compile, run and test FFME.*
 
 1. Clone this repository.
-2. Download the FFmpeg **shared** binaries for your target architecture: <a href="https://ffmpeg.zeranoe.com/builds/win32/shared/ffmpeg-4.1.1-win32-shared.zip">32-bit</a> or <a href="https://ffmpeg.zeranoe.com/builds/win64/shared/ffmpeg-4.1.1-win64-shared.zip">64-bit</a>.
+2. Download the FFmpeg **shared** binaries for your target architecture: <a href="https://ffmpeg.zeranoe.com/builds/win32/shared/ffmpeg-4.1.3-win32-shared.zip">32-bit</a> or <a href="https://ffmpeg.zeranoe.com/builds/win64/shared/ffmpeg-4.1.3-win64-shared.zip">64-bit</a>.
 3. Extract the contents of the <code>zip</code> file you just downloaded and go to the <code>bin</code> folder that got extracted. You should see 3 <code>exe</code> files and multiple <code>dll</code> files. Select and copy all of them.
 4. Now paste all files from the prior step onto a well-known folder. Take note of the full path. (I used `c:\ffmpeg\`)
 5. Open the solution and set the <code>Unosquare.FFME.Windows.Sample</code> project as the startup project. You can do this by right clicking on the project and selecting <code>Set as startup project</code>. Please note that you will need Visual Studio 2019 with dotnet Core 3.0 SDK for your target architecture installed.

Unosquare.FFME.Windows/MediaElement.Properties.cs

@@ -324,7 +324,19 @@ public MediaPlaybackState UnloadedBehavior
         /// </summary>
         public static readonly DependencyProperty UnloadedBehaviorProperty = DependencyProperty.Register(
             nameof(UnloadedBehavior), typeof(MediaPlaybackState), typeof(MediaElement),
-            new FrameworkPropertyMetadata(MediaPlaybackState.Close));
+            new FrameworkPropertyMetadata(MediaPlaybackState.Close, OnUnloadedBehaviorPropertyChanged));
+
+        private static void OnUnloadedBehaviorPropertyChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
+        {
+            if (d == null || d is MediaElement == false)
+                return;
+
+            var element = (MediaElement)d;
+            if (element.VideoView == null) return;
+
+            var behavior = element.UnloadedBehavior;
+            element.VideoView.PreventShutdown = behavior != MediaPlaybackState.Close;
+        }
 
         #endregion
 

Unosquare.FFME.Windows/Rendering/ElementHostBase.cs

@@ -56,6 +56,12 @@ public event RoutedEventHandler ElementLoaded
         /// </summary>
         public bool HasOwnDispatcher { get; }
 
+        /// <summary>
+        /// Gets or sets if the independent dispatcher should be prevented
+        /// from being shutdown when the host visual is removed from the visual tree (unloaded).
+        /// </summary>
+        public bool PreventShutdown { get; set; }
+
         /// <summary>
         /// Gets the dispatcher this element is hosted on.
         /// </summary>
@@ -160,7 +166,10 @@ protected virtual void Dispose(bool alsoManaged)
                 if (!m_IsDisposed)
                 {
                     if (alsoManaged)
+                    {
+                        PreventShutdown = false;
                         HandleUnloadedEvent(this, EventArgs.Empty);
+                    }
 
                     m_IsDisposed = true;
                 }
@@ -256,8 +265,14 @@ protected virtual void HandleUnloadedEvent(object sender, EventArgs e)
         {
             lock (UnloadLock)
             {
-                if (!HasOwnDispatcher || ElementDispatcher == null || ElementDispatcher.HasShutdownStarted || ElementDispatcher.HasShutdownFinished)
+                if (PreventShutdown ||
+                    !HasOwnDispatcher ||
+                    ElementDispatcher == null ||
+                    ElementDispatcher.HasShutdownStarted ||
+                    ElementDispatcher.HasShutdownFinished)
+                {
                     return;
+                }
 
                 ElementDispatcher.ShutdownFinished += (s, ev) =>
                 {

Unosquare.FFME.Windows/Unosquare.FFME.Windows.csproj

@@ -34,7 +34,7 @@
     <PackageIconUrl>https://github.com/unosquare/ffmediaelement/raw/master/Support/ffme.png</PackageIconUrl>
     <PackageTags>ffme hls wpf ffmpeg mediaelement h264 h265 hevc audio video decoding playback frame</PackageTags>
     <PackageReleaseNotes>
-      This is a release package of the Floyd Engine build referencing bindings to FFmpeg version 4.1.1
+      This is a release package of the Floyd Engine build referencing bindings to FFmpeg version 4.1.3
       This package does not contain the required FFmpeg binaries. Please refer to the following URL for instructions on how to obtain the binaries: https://github.com/unosquare/ffmediaelement
       Release details: https://github.com/unosquare/ffmediaelement/milestone/12?closed=1
     </PackageReleaseNotes>