Add device info to CastPlayer

Issue: androidx/media#142
PiperOrigin-RevId: 468666737

extensions/cast/src/main/java/com/google/android/exoplayer2/ext/cast/CastPlayer.java

@@ -80,6 +80,10 @@ import org.checkerframework.checker.nullness.qual.RequiresNonNull;
  */
 public final class CastPlayer extends BasePlayer {
 
+  /** The {@link DeviceInfo} returned by {@link #getDeviceInfo() this player}. */
+  public static final DeviceInfo DEVICE_INFO =
+      new DeviceInfo(DeviceInfo.PLAYBACK_TYPE_REMOTE, /* minVolume= */ 0, /* maxVolume= */ 0);
+
   static {
     ExoPlayerLibraryInfo.registerModule("goog.exo.cast");
   }
@@ -727,10 +731,10 @@ public final class CastPlayer extends BasePlayer {
     return CueGroup.EMPTY_TIME_ZERO;
   }
 
-  /** This method is not supported and always returns {@link DeviceInfo#UNKNOWN}. */
+  /** This method always returns {@link CastPlayer#DEVICE_INFO}. */
   @Override
   public DeviceInfo getDeviceInfo() {
-    return DeviceInfo.UNKNOWN;
+    return DEVICE_INFO;
   }
 
   /** This method is not supported and always returns {@code 0}. */

extensions/cast/src/test/java/com/google/android/exoplayer2/ext/cast/CastPlayerTest.java

@@ -63,6 +63,7 @@ import static org.mockito.MockitoAnnotations.initMocks;
 import android.net.Uri;
 import androidx.test.ext.junit.runners.AndroidJUnit4;
 import com.google.android.exoplayer2.C;
+import com.google.android.exoplayer2.DeviceInfo;
 import com.google.android.exoplayer2.MediaItem;
 import com.google.android.exoplayer2.MediaMetadata;
 import com.google.android.exoplayer2.PlaybackParameters;
@@ -1864,6 +1865,14 @@ public class CastPlayerTest {
     verify(mockListener, never()).onMediaMetadataChanged(any());
   }
 
+  @Test
+  public void getDeviceInfo_returnsCorrectDeviceInfoWithPlaybackTypeRemote() {
+    DeviceInfo deviceInfo = castPlayer.getDeviceInfo();
+
+    assertThat(deviceInfo).isEqualTo(CastPlayer.DEVICE_INFO);
+    assertThat(deviceInfo.playbackType).isEqualTo(DeviceInfo.PLAYBACK_TYPE_REMOTE);
+  }
+
   private int[] createMediaQueueItemIds(int numberOfIds) {
     int[] mediaQueueItemIds = new int[numberOfIds];
     for (int i = 0; i < numberOfIds; i++) {