Make resetPosition reset the position if true

Issue: #8024
PiperOrigin-RevId: 335846035

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

@@ -308,6 +308,13 @@ public final class CastPlayer extends BasePlayer {
   }
 
   @Override
+  public void setMediaItems(List<MediaItem> mediaItems, boolean resetPosition) {
+    int windowIndex = resetPosition ? 0 : getCurrentWindowIndex();
+    long startPositionMs = resetPosition ? C.TIME_UNSET : getContentPosition();
+    setMediaItems(mediaItems, windowIndex, startPositionMs);
+  }
+
+  @Override
   public void setMediaItems(
       List<MediaItem> mediaItems, int startWindowIndex, long startPositionMs) {
     setMediaItemsInternal(

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

@@ -45,12 +45,6 @@ public abstract class BasePlayer implements Player {
   }
 
   @Override
-  public void setMediaItems(List<MediaItem> mediaItems, boolean resetPosition) {
-    setMediaItems(
-        mediaItems, /* startWindowIndex= */ C.INDEX_UNSET, /* startPositionMs= */ C.TIME_UNSET);
-  }
-
-  @Override
   public void setMediaItems(List<MediaItem> mediaItems) {
     setMediaItems(mediaItems, /* resetPosition= */ true);
   }

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

@@ -348,6 +348,11 @@ import java.util.concurrent.TimeoutException;
   }
 
   @Override
+  public void setMediaItems(List<MediaItem> mediaItems, boolean resetPosition) {
+    setMediaSources(createMediaSources(mediaItems), resetPosition);
+  }
+
+  @Override
   public void setMediaItems(
       List<MediaItem> mediaItems, int startWindowIndex, long startPositionMs) {
     setMediaSources(createMediaSources(mediaItems), startWindowIndex, startPositionMs);

library/core/src/test/java/com/google/android/exoplayer2/ExoPlayerTest.java

@@ -104,6 +104,7 @@ import com.google.android.exoplayer2.upstream.TransferListener;
 import com.google.android.exoplayer2.util.Assertions;
 import com.google.android.exoplayer2.util.Clock;
 import com.google.common.collect.ImmutableList;
+import com.google.common.collect.Lists;
 import java.io.IOException;
 import java.util.ArrayList;
 import java.util.Arrays;
@@ -5700,6 +5701,42 @@ public final class ExoPlayerTest {
   }
 
   @Test
+  public void setMediaItems_resetPosition_resetsPosition() throws Exception {
+    final int[] currentWindowIndices = {C.INDEX_UNSET, C.INDEX_UNSET};
+    final long[] currentPositions = {C.INDEX_UNSET, C.INDEX_UNSET};
+    ActionSchedule actionSchedule =
+        new ActionSchedule.Builder(TAG)
+            .pause()
+            .executeRunnable(
+                new PlayerRunnable() {
+                  @Override
+                  public void run(SimpleExoPlayer player) {
+                    player.seekTo(/* windowIndex= */ 1, /* positionMs= */ 1000);
+                    currentWindowIndices[0] = player.getCurrentWindowIndex();
+                    currentPositions[0] = player.getCurrentPosition();
+                    List<MediaItem> listOfTwo =
+                        Lists.newArrayList(
+                            MediaItem.fromUri(Uri.EMPTY), MediaItem.fromUri(Uri.EMPTY));
+                    player.setMediaItems(listOfTwo, /* resetPosition= */ true);
+                    currentWindowIndices[1] = player.getCurrentWindowIndex();
+                    currentPositions[1] = player.getCurrentPosition();
+                  }
+                })
+            .prepare()
+            .waitForTimelineChanged()
+            .play()
+            .build();
+    new ExoPlayerTestRunner.Builder(context)
+        .setActionSchedule(actionSchedule)
+        .build()
+        .start(/* doPrepare= */ false)
+        .blockUntilActionScheduleFinished(TIMEOUT_MS)
+        .blockUntilEnded(TIMEOUT_MS);
+    assertArrayEquals(new int[] {1, 0}, currentWindowIndices);
+    assertArrayEquals(new long[] {1000, 0}, currentPositions);
+  }
+
+  @Test
   public void setMediaSources_empty_whenEmpty_validInitialSeek_correctMaskingWindowIndex()
       throws Exception {
     Timeline secondTimeline = new FakeTimeline(/* windowCount= */ 1);