diff --git a/library/common/src/main/java/com/google/android/exoplayer2/Player.java b/library/common/src/main/java/com/google/android/exoplayer2/Player.java
index 1e83b03ab1..cc57a5becd 100644
--- a/library/common/src/main/java/com/google/android/exoplayer2/Player.java
+++ b/library/common/src/main/java/com/google/android/exoplayer2/Player.java
@@ -1613,10 +1613,28 @@ public interface Player {
   int COMMAND_SET_REPEAT_MODE = 15;
 
   /**
-   * Command to get the currently playing {@link MediaItem}.
+   * Command to get information about the currently playing {@link MediaItem}.
    *
-   * <p>The {@link #getCurrentMediaItem()} method must only be called if this command is {@linkplain
-   * #isCommandAvailable(int) available}.
+   * <p>The following methods must only be called if this command is {@linkplain
+   * #isCommandAvailable(int) available}:
+   *
+   * <ul>
+   *   <li>{@link #getCurrentMediaItem()}
+   *   <li>{@link #isCurrentMediaItemDynamic()}
+   *   <li>{@link #isCurrentMediaItemLive()}
+   *   <li>{@link #isCurrentMediaItemSeekable()}
+   *   <li>{@link #getCurrentLiveOffset()}
+   *   <li>{@link #getDuration()}
+   *   <li>{@link #getCurrentPosition()}
+   *   <li>{@link #getBufferedPosition()}
+   *   <li>{@link #getContentDuration()}
+   *   <li>{@link #getContentPosition()}
+   *   <li>{@link #getContentBufferedPosition()}
+   *   <li>{@link #getTotalBufferedDuration()}
+   *   <li>{@link #isPlayingAd()}
+   *   <li>{@link #getCurrentAdGroupIndex()}
+   *   <li>{@link #getCurrentAdIndexInAdGroup()}
+   * </ul>
    */
   int COMMAND_GET_CURRENT_MEDIA_ITEM = 16;
 
@@ -1636,8 +1654,6 @@ public interface Player {
    *   <li>{@link #getPreviousMediaItemIndex()}
    *   <li>{@link #hasPreviousMediaItem()}
    *   <li>{@link #hasNextMediaItem()}
-   *   <li>{@link #getCurrentAdGroupIndex()}
-   *   <li>{@link #getCurrentAdIndexInAdGroup()}
    * </ul>
    */
   int COMMAND_GET_TIMELINE = 17;
@@ -2667,18 +2683,27 @@ public interface Player {
   /**
    * Returns the duration of the current content or ad in milliseconds, or {@link C#TIME_UNSET} if
    * the duration is not known.
+   *
+   * <p>This method must only be called if {@link #COMMAND_GET_CURRENT_MEDIA_ITEM} is {@linkplain
+   * #getAvailableCommands() available}.
    */
   long getDuration();
 
   /**
    * Returns the playback position in the current content or ad, in milliseconds, or the prospective
    * position in milliseconds if the {@link #getCurrentTimeline() current timeline} is empty.
+   *
+   * <p>This method must only be called if {@link #COMMAND_GET_CURRENT_MEDIA_ITEM} is {@linkplain
+   * #getAvailableCommands() available}.
    */
   long getCurrentPosition();
 
   /**
    * Returns an estimate of the position in the current content or ad up to which data is buffered,
    * in milliseconds.
+   *
+   * <p>This method must only be called if {@link #COMMAND_GET_CURRENT_MEDIA_ITEM} is {@linkplain
+   * #getAvailableCommands() available}.
    */
   long getBufferedPosition();
 
@@ -2692,6 +2717,9 @@ public interface Player {
   /**
    * Returns an estimate of the total buffered duration from the current position, in milliseconds.
    * This includes pre-buffered data for subsequent ads and {@linkplain MediaItem media items}.
+   *
+   * <p>This method must only be called if {@link #COMMAND_GET_CURRENT_MEDIA_ITEM} is {@linkplain
+   * #getAvailableCommands() available}.
    */
   long getTotalBufferedDuration();
 
@@ -2705,6 +2733,9 @@ public interface Player {
    * Returns whether the current {@link MediaItem} is dynamic (may change when the {@link Timeline}
    * is updated), or {@code false} if the {@link Timeline} is empty.
    *
+   * <p>This method must only be called if {@link #COMMAND_GET_CURRENT_MEDIA_ITEM} is {@linkplain
+   * #getAvailableCommands() available}.
+   *
    * @see Timeline.Window#isDynamic
    */
   boolean isCurrentMediaItemDynamic();
@@ -2719,6 +2750,9 @@ public interface Player {
    * Returns whether the current {@link MediaItem} is live, or {@code false} if the {@link Timeline}
    * is empty.
    *
+   * <p>This method must only be called if {@link #COMMAND_GET_CURRENT_MEDIA_ITEM} is {@linkplain
+   * #getAvailableCommands() available}.
+   *
    * @see Timeline.Window#isLive()
    */
   boolean isCurrentMediaItemLive();
@@ -2733,6 +2767,9 @@ public interface Player {
    *
    * <p>Note that this offset may rely on an accurate local time, so this method may return an
    * incorrect value if the difference between system clock and server clock is unknown.
+   *
+   * <p>This method must only be called if {@link #COMMAND_GET_CURRENT_MEDIA_ITEM} is {@linkplain
+   * #getAvailableCommands() available}.
    */
   long getCurrentLiveOffset();
 
@@ -2746,18 +2783,26 @@ public interface Player {
    * Returns whether the current {@link MediaItem} is seekable, or {@code false} if the {@link
    * Timeline} is empty.
    *
+   * <p>This method must only be called if {@link #COMMAND_GET_CURRENT_MEDIA_ITEM} is {@linkplain
+   * #getAvailableCommands() available}.
+   *
    * @see Timeline.Window#isSeekable
    */
   boolean isCurrentMediaItemSeekable();
 
-  /** Returns whether the player is currently playing an ad. */
+  /**
+   * Returns whether the player is currently playing an ad.
+   *
+   * <p>This method must only be called if {@link #COMMAND_GET_CURRENT_MEDIA_ITEM} is {@linkplain
+   * #getAvailableCommands() available}.
+   */
   boolean isPlayingAd();
 
   /**
    * If {@link #isPlayingAd()} returns true, returns the index of the ad group in the period
    * currently being played. Returns {@link C#INDEX_UNSET} otherwise.
    *
-   * <p>This method must only be called if {@link #COMMAND_GET_TIMELINE} is {@linkplain
+   * <p>This method must only be called if {@link #COMMAND_GET_CURRENT_MEDIA_ITEM} is {@linkplain
    * #getAvailableCommands() available}.
    */
   int getCurrentAdGroupIndex();
@@ -2766,7 +2811,7 @@ public interface Player {
    * If {@link #isPlayingAd()} returns true, returns the index of the ad in its ad group. Returns
    * {@link C#INDEX_UNSET} otherwise.
    *
-   * <p>This method must only be called if {@link #COMMAND_GET_TIMELINE} is {@linkplain
+   * <p>This method must only be called if {@link #COMMAND_GET_CURRENT_MEDIA_ITEM} is {@linkplain
    * #getAvailableCommands() available}.
    */
   int getCurrentAdIndexInAdGroup();
@@ -2775,6 +2820,9 @@ public interface Player {
    * If {@link #isPlayingAd()} returns {@code true}, returns the duration of the current content in
    * milliseconds, or {@link C#TIME_UNSET} if the duration is not known. If there is no ad playing,
    * the returned duration is the same as that returned by {@link #getDuration()}.
+   *
+   * <p>This method must only be called if {@link #COMMAND_GET_CURRENT_MEDIA_ITEM} is {@linkplain
+   * #getAvailableCommands() available}.
    */
   long getContentDuration();
 
@@ -2782,6 +2830,9 @@ public interface Player {
    * If {@link #isPlayingAd()} returns {@code true}, returns the content position that will be
    * played once all ads in the ad group have finished playing, in milliseconds. If there is no ad
    * playing, the returned position is the same as that returned by {@link #getCurrentPosition()}.
+   *
+   * <p>This method must only be called if {@link #COMMAND_GET_CURRENT_MEDIA_ITEM} is {@linkplain
+   * #getAvailableCommands() available}.
    */
   long getContentPosition();
 
@@ -2789,6 +2840,9 @@ public interface Player {
    * If {@link #isPlayingAd()} returns {@code true}, returns an estimate of the content position in
    * the current content up to which data is buffered, in milliseconds. If there is no ad playing,
    * the returned position is the same as that returned by {@link #getBufferedPosition()}.
+   *
+   * <p>This method must only be called if {@link #COMMAND_GET_CURRENT_MEDIA_ITEM} is {@linkplain
+   * #getAvailableCommands() available}.
    */
   long getContentBufferedPosition();
 
diff --git a/library/common/src/main/java/com/google/android/exoplayer2/Timeline.java b/library/common/src/main/java/com/google/android/exoplayer2/Timeline.java
index 7acd4863ab..6fb855cc25 100644
--- a/library/common/src/main/java/com/google/android/exoplayer2/Timeline.java
+++ b/library/common/src/main/java/com/google/android/exoplayer2/Timeline.java
@@ -1404,6 +1404,38 @@ public abstract class Timeline implements Bundleable {
     return bundle;
   }
 
+  /**
+   * Returns a {@link Bundle} containing just the specified {@link Window}.
+   *
+   * <p>The {@link #getWindow(int, Window)} windows} and {@link #getPeriod(int, Period) periods} of
+   * an instance restored by {@link #CREATOR} may have missing fields as described in {@link
+   * Window#toBundle()} and {@link Period#toBundle()}.
+   *
+   * @param windowIndex The index of the {@link Window} to include in the {@link Bundle}.
+   */
+  public final Bundle toBundleWithOneWindowOnly(int windowIndex) {
+    Window window = getWindow(windowIndex, new Window(), /* defaultPositionProjectionUs= */ 0);
+
+    List<Bundle> periodBundles = new ArrayList<>();
+    Period period = new Period();
+    for (int i = window.firstPeriodIndex; i <= window.lastPeriodIndex; i++) {
+      getPeriod(i, period, /* setIds= */ false);
+      period.windowIndex = 0;
+      periodBundles.add(period.toBundle());
+    }
+
+    window.lastPeriodIndex = window.lastPeriodIndex - window.firstPeriodIndex;
+    window.firstPeriodIndex = 0;
+    Bundle windowBundle = window.toBundle();
+
+    Bundle bundle = new Bundle();
+    BundleUtil.putBinder(
+        bundle, FIELD_WINDOWS, new BundleListRetriever(ImmutableList.of(windowBundle)));
+    BundleUtil.putBinder(bundle, FIELD_PERIODS, new BundleListRetriever(periodBundles));
+    bundle.putIntArray(FIELD_SHUFFLED_WINDOW_INDICES, new int[] {0});
+    return bundle;
+  }
+
   /**
    * Object that can restore a {@link Timeline} from a {@link Bundle}.
    *