Add method to check if tunneling is enabled.

Issue: google/ExoPlayer#2518
PiperOrigin-RevId: 460482615

library/core/src/main/java/com/google/android/exoplayer2/ExoPlayer.java

@@ -1602,4 +1602,13 @@ public interface ExoPlayer extends Player {
    * @see AudioOffloadListener#onExperimentalSleepingForOffloadChanged(boolean)
    */
   boolean experimentalIsSleepingForOffload();
+
+  /**
+   * Returns whether <a
+   * href="https://source.android.com/devices/tv/multimedia-tunneling">tunneling</a> is enabled for
+   * the currently selected tracks.
+   *
+   * @see Player.Listener#onTracksChanged(Tracks)
+   */
+  boolean isTunnelingEnabled();
 }

library/core/src/main/java/com/google/android/exoplayer2/ExoPlayerImpl.java

@@ -1671,6 +1671,17 @@ import java.util.concurrent.TimeoutException;
     streamVolumeManager.setMuted(muted);
   }
 
+  @Override
+  public boolean isTunnelingEnabled() {
+    verifyApplicationThread();
+    for (RendererConfiguration config : playbackInfo.trackSelectorResult.rendererConfigurations) {
+      if (config.tunneling) {
+        return true;
+      }
+    }
+    return false;
+  }
+
   /* package */ void setThrowsWhenUsingWrongThread(boolean throwsWhenUsingWrongThread) {
     this.throwsWhenUsingWrongThread = throwsWhenUsingWrongThread;
   }

library/core/src/main/java/com/google/android/exoplayer2/SimpleExoPlayer.java

@@ -1247,6 +1247,12 @@ public class SimpleExoPlayer extends BasePlayer
     player.setDeviceMuted(muted);
   }
 
+  @Override
+  public boolean isTunnelingEnabled() {
+    blockUntilConstructorFinished();
+    return player.isTunnelingEnabled();
+  }
+
   /* package */ void setThrowsWhenUsingWrongThread(boolean throwsWhenUsingWrongThread) {
     blockUntilConstructorFinished();
     player.setThrowsWhenUsingWrongThread(throwsWhenUsingWrongThread);

testutils/src/main/java/com/google/android/exoplayer2/testutil/StubExoPlayer.java

@@ -410,4 +410,9 @@ public class StubExoPlayer extends StubPlayer implements ExoPlayer {
   public boolean experimentalIsSleepingForOffload() {
     throw new UnsupportedOperationException();
   }
+
+  @Override
+  public boolean isTunnelingEnabled() {
+    throw new UnsupportedOperationException();
+  }
 }