Add device info to CastPlayer

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

RELEASENOTES.md

@@ -63,6 +63,10 @@
     *   Update CMake version to avoid incompatibilities with the latest Android
         Studio releases
         ([#9933](https://github.com/google/ExoPlayer/issues/9933)).
+*   Cast extension:
+    *   Implement `getDeviceInfo()` to be able to identify `CastPlayer` when
+        controlling playback with a `MediaController`
+        ([#142](https://github.com/google/ExoPlayer/issues/142)).
 
 ### 1.0.0-beta02 (2022-07-21)
 

libraries/cast/src/main/java/androidx/media3/cast/CastPlayer.java

@@ -82,6 +82,10 @@ import org.checkerframework.checker.nullness.qual.RequiresNonNull;
 @UnstableApi
 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 {
     MediaLibraryInfo.registerModule("media3.cast");
   }
@@ -729,10 +733,10 @@ 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}. */

libraries/cast/src/test/java/androidx/media3/cast/CastPlayerTest.java

@@ -62,6 +62,7 @@ import static org.mockito.MockitoAnnotations.initMocks;
 
 import android.net.Uri;
 import androidx.media3.common.C;
+import androidx.media3.common.DeviceInfo;
 import androidx.media3.common.MediaItem;
 import androidx.media3.common.MediaMetadata;
 import androidx.media3.common.MimeTypes;
@@ -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++) {