Add COMMAND_SEEK_TO_PREVIOUS_MEDIA_ITEM to available commands

PiperOrigin-RevId: 362036291

extensions/mediasession/src/main/java/com/google/android/exoplayer2/ext/mediasession/TimelineQueueNavigator.java

@@ -98,7 +98,10 @@ public abstract class TimelineQueueNavigator implements MediaSessionConnector.Qu
     if (!timeline.isEmpty() && !player.isPlayingAd()) {
       timeline.getWindow(player.getCurrentWindowIndex(), window);
       enableSkipTo = timeline.getWindowCount() > 1;
-      enablePrevious = window.isSeekable || !window.isLive() || player.hasPrevious();
+      enablePrevious =
+          window.isSeekable
+              || !window.isLive()
+              || player.isCommandAvailable(Player.COMMAND_SEEK_TO_PREVIOUS_MEDIA_ITEM);
       enableNext =
           (window.isLive() && window.isDynamic)
               || player.isCommandAvailable(Player.COMMAND_SEEK_TO_NEXT_MEDIA_ITEM);

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

@@ -266,6 +266,9 @@ public abstract class BasePlayer implements Player {
   }
 
   protected Commands getAvailableCommands() {
-    return new Commands.Builder().addIf(COMMAND_SEEK_TO_NEXT_MEDIA_ITEM, hasNext()).build();
+    return new Commands.Builder()
+        .addIf(COMMAND_SEEK_TO_NEXT_MEDIA_ITEM, hasNext())
+        .addIf(COMMAND_SEEK_TO_PREVIOUS_MEDIA_ITEM, hasPrevious())
+        .build();
   }
 }

library/common/src/main/java/com/google/android/exoplayer2/Player.java

@@ -1031,14 +1031,16 @@ public interface Player {
 
   /**
    * Commands that can be executed on a {@code Player}. One of {@link
-   * #COMMAND_SEEK_TO_NEXT_MEDIA_ITEM}.
+   * #COMMAND_SEEK_TO_NEXT_MEDIA_ITEM} or {@link #COMMAND_SEEK_TO_PREVIOUS_MEDIA_ITEM}.
    */
   @Documented
   @Retention(RetentionPolicy.SOURCE)
-  @IntDef({COMMAND_SEEK_TO_NEXT_MEDIA_ITEM})
+  @IntDef({COMMAND_SEEK_TO_NEXT_MEDIA_ITEM, COMMAND_SEEK_TO_PREVIOUS_MEDIA_ITEM})
   @interface Command {}
   /** Command to seek to the next {@link MediaItem} in the playlist. */
   int COMMAND_SEEK_TO_NEXT_MEDIA_ITEM = 0;
+  /** Command to seek to the previous {@link MediaItem} in the playlist. */
+  int COMMAND_SEEK_TO_PREVIOUS_MEDIA_ITEM = 1;
 
   /** Returns the component of this player for audio output, or null if audio is not supported. */
   @Nullable

library/ui/src/main/java/com/google/android/exoplayer2/ui/PlayerControlView.java

@@ -913,7 +913,10 @@ public class PlayerControlView extends FrameLayout {
         timeline.getWindow(player.getCurrentWindowIndex(), window);
         boolean isSeekable = window.isSeekable;
         enableSeeking = isSeekable;
-        enablePrevious = isSeekable || !window.isLive() || player.hasPrevious();
+        enablePrevious =
+            isSeekable
+                || !window.isLive()
+                || player.isCommandAvailable(Player.COMMAND_SEEK_TO_PREVIOUS_MEDIA_ITEM);
         enableRewind = isSeekable && controlDispatcher.isRewindEnabled();
         enableFastForward = isSeekable && controlDispatcher.isFastForwardEnabled();
         enableNext =

library/ui/src/main/java/com/google/android/exoplayer2/ui/PlayerNotificationManager.java

@@ -1460,7 +1460,10 @@ public class PlayerNotificationManager {
     if (!timeline.isEmpty() && !player.isPlayingAd()) {
       timeline.getWindow(player.getCurrentWindowIndex(), window);
       boolean isSeekable = window.isSeekable;
-      enablePrevious = isSeekable || !window.isLive() || player.hasPrevious();
+      enablePrevious =
+          isSeekable
+              || !window.isLive()
+              || player.isCommandAvailable(Player.COMMAND_SEEK_TO_PREVIOUS_MEDIA_ITEM);
       enableRewind = isSeekable && controlDispatcher.isRewindEnabled();
       enableFastForward = isSeekable && controlDispatcher.isFastForwardEnabled();
       enableNext =

library/ui/src/main/java/com/google/android/exoplayer2/ui/StyledPlayerControlView.java

@@ -1148,7 +1148,10 @@ public class StyledPlayerControlView extends FrameLayout {
         timeline.getWindow(player.getCurrentWindowIndex(), window);
         boolean isSeekable = window.isSeekable;
         enableSeeking = isSeekable;
-        enablePrevious = isSeekable || !window.isLive() || player.hasPrevious();
+        enablePrevious =
+            isSeekable
+                || !window.isLive()
+                || player.isCommandAvailable(Player.COMMAND_SEEK_TO_PREVIOUS_MEDIA_ITEM);
         enableRewind = isSeekable && controlDispatcher.isRewindEnabled();
         enableFastForward = isSeekable && controlDispatcher.isFastForwardEnabled();
         enableNext =