Fixes #2545 Multiple media elements handling

app/src/common/shared/org/mozilla/vrbrowser/browser/Media.java

@@ -23,11 +23,13 @@ public class Media implements MediaElement.Delegate {
     private MediaElement mMedia;
     private CopyOnWriteArrayList<MediaElement.Delegate> mMediaListeners;
     private ResizeDelegate mResizeDelegate;
+    private long mLastStateUpdate;
 
     public Media(@NonNull MediaElement aMediaElement) {
         mMedia = aMediaElement;
         mMediaListeners = new CopyOnWriteArrayList<>();
         aMediaElement.setDelegate(this);
+        mLastStateUpdate = 0;
     }
 
     public void addMediaListener(MediaElement.Delegate aListener) {
@@ -113,6 +115,10 @@ public void setMuted(boolean aIsMuted) {
         mMedia.setMuted(aIsMuted);
     }
 
+    public long getLastStateUpdate() {
+        return mLastStateUpdate;
+    }
+
     public void unload() {
         mIsUnloaded = true;
         mMediaListeners.clear();
@@ -149,6 +155,7 @@ public void onPlaybackStateChange(MediaElement mediaElement, int playbackState)
             mPlaying = false;
             mIsUnloaded = true;
         }
+        mLastStateUpdate = System.currentTimeMillis();
         mMediaListeners.forEach(listener -> listener.onPlaybackStateChange(mediaElement, playbackState));
     }
 

app/src/common/shared/org/mozilla/vrbrowser/browser/VideoAvailabilityListener.java

@@ -1,5 +1,7 @@
 package org.mozilla.vrbrowser.browser;
 
+import androidx.annotation.NonNull;
+
 public interface VideoAvailabilityListener {
-    default void onVideoAvailabilityChanged(boolean aVideosAvailable) {}
+    default void onVideoAvailabilityChanged(@NonNull Media media, boolean aVideoAvailable) {}
 }

app/src/common/shared/org/mozilla/vrbrowser/browser/engine/Session.java

@@ -49,10 +49,12 @@
 
 import java.net.URI;
 import java.net.URISyntaxException;
+import java.util.Comparator;
 import java.util.concurrent.CompletableFuture;
 import java.util.concurrent.CopyOnWriteArrayList;
 import java.util.concurrent.atomic.AtomicBoolean;
 import java.util.concurrent.atomic.AtomicInteger;
+import java.util.function.Predicate;
 
 import static java.util.Objects.requireNonNull;
 import static org.mozilla.vrbrowser.utils.ServoUtils.createServoSession;
@@ -247,7 +249,9 @@ private void dumpState(GeckoSession.ContentDelegate aListener) {
     }
 
     private void dumpState(VideoAvailabilityListener aListener) {
-        aListener.onVideoAvailabilityChanged(mState.mMediaElements != null && mState.mMediaElements.size() > 0);
+        mState.mMediaElements.forEach(element -> {
+            aListener.onVideoAvailabilityChanged(element,true);
+        });
     }
 
     private void dumpState(WebXRStateChangedListener aListener) {
@@ -690,6 +694,7 @@ public boolean isFirstContentfulPaint() {
         return mFirstContentfulPaint;
     }
 
+    @Nullable
     public Media getFullScreenVideo() {
         for (Media media: mState.mMediaElements) {
             if (media.isFullscreen()) {
@@ -703,6 +708,19 @@ public Media getFullScreenVideo() {
         return null;
     }
 
+    @Nullable
+    public Media getActiveVideo() {
+        for (Media media: mState.mMediaElements) {
+            if (media.isFullscreen()) {
+                return media;
+            }
+        }
+        return mState.mMediaElements.stream()
+                .sorted((o1, o2) -> (int)o2.getLastStateUpdate() - (int)o1.getLastStateUpdate())
+                .filter(Media::isPlayed)
+                .findFirst().orElse(null);
+    }
+
     public boolean isInputActive() {
         return mState.mIsInputActive;
     }
@@ -1448,7 +1466,7 @@ public void onMediaAdd(@NonNull GeckoSession aSession, @NonNull MediaElement ele
         mState.mMediaElements.add(media);
 
         for (VideoAvailabilityListener listener: mVideoAvailabilityListeners) {
-            listener.onVideoAvailabilityChanged(true);
+            listener.onVideoAvailabilityChanged(media, true);
         }
     }
 
@@ -1462,10 +1480,8 @@ public void onMediaRemove(@NonNull GeckoSession aSession, @NonNull MediaElement
             if (media.getMediaElement() == element) {
                 media.unload();
                 mState.mMediaElements.remove(i);
-                if (mState.mMediaElements.size() == 0) {
-                    for (VideoAvailabilityListener listener: mVideoAvailabilityListeners) {
-                        listener.onVideoAvailabilityChanged(false);
-                    }
+                for (VideoAvailabilityListener listener: mVideoAvailabilityListeners) {
+                    listener.onVideoAvailabilityChanged(media, false);
                 }
                 return;
             }

app/src/common/shared/org/mozilla/vrbrowser/ui/widgets/WindowWidget.java

@@ -1668,37 +1668,29 @@ public void onExternalResponse(@NonNull GeckoSession geckoSession, @NonNull Geck
 
     // VideoAvailabilityListener
 
-    private Media mMedia;
-
     @Override
-    public void onVideoAvailabilityChanged(boolean aVideosAvailable) {
+    public void onVideoAvailabilityChanged(@NonNull Media aMedia, boolean aVideoAvailable) {
         boolean mediaAvailable;
         if (mSession != null) {
-            if (mMedia != null) {
-                mMedia.removeMediaListener(mMediaDelegate);
-            }
-
-            mMedia = mSession.getFullScreenVideo();
-            if (aVideosAvailable && mMedia != null) {
-                mMedia.addMediaListener(mMediaDelegate);
-                mediaAvailable = true;
+            if (aVideoAvailable) {
+                aMedia.addMediaListener(mMediaDelegate);
 
             } else {
-                mediaAvailable = false;
+                aMedia.removeMediaListener(mMediaDelegate);
             }
+            mediaAvailable = mSession.getActiveVideo() != null;
 
         } else {
             mediaAvailable = false;
         }
 
         if (mediaAvailable) {
-            if (mSession.getFullScreenVideo().isPlayed()) {
-                mViewModel.setIsMediaAvailable(true);
+            if (mSession.getActiveVideo().isPlayed()) {
                 mViewModel.setIsMediaPlaying(true);
             }
+            mViewModel.setIsMediaAvailable(true);
 
         } else {
-            mMedia = null;
             mViewModel.setIsMediaAvailable(false);
             mViewModel.setIsMediaPlaying(false);
         }
@@ -1754,6 +1746,8 @@ public void captureImage() {
     public void onLocationChange(@NonNull GeckoSession session, @Nullable String url) {
         mViewModel.setUrl(url);
         mViewModel.setIsDrmUsed(false);
+        mViewModel.setIsMediaAvailable(false);
+        mViewModel.setIsMediaPlaying(false);
 
         if (StringUtils.isEmpty(url)) {
             mViewModel.setIsBookmarked(false);

app/src/common/shared/org/mozilla/vrbrowser/ui/widgets/Windows.java

@@ -1085,17 +1085,21 @@ public void onTitleClicked(@NonNull TitleBarWidget titleBar) {
     @Override
     public void onMediaPlayClicked(@NonNull TitleBarWidget titleBar) {
         for (WindowWidget window : getCurrentWindows()) {
-            if (window.getTitleBar() == titleBar) {
-                window.getSession().getFullScreenVideo().play();
+            if (window.getTitleBar() == titleBar &&
+                    window.getSession() != null &&
+                    window.getSession().getActiveVideo() != null) {
+                window.getSession().getActiveVideo().play();
             }
         }
     }
 
     @Override
     public void onMediaPauseClicked(@NonNull TitleBarWidget titleBar) {
         for (WindowWidget window : getCurrentWindows()) {
-            if (window.getTitleBar() == titleBar) {
-                window.getSession().getFullScreenVideo().pause();
+            if (window.getTitleBar() == titleBar &&
+                    window.getSession() != null &&
+                    window.getSession().getActiveVideo() != null) {
+                window.getSession().getActiveVideo().pause();
             }
         }
     }