Do not set a duration for live streams

A live window with changing duration can't be properly
displayed in a media notification. The duration constantly
changes and creates a nervous jumping seekbar that is not
really useful.

This change sets the duration for live streams to `C.TIME_UNSET`
when publishing the player state to the platform session. This
way no duration is sent to the platform session which prevents
media controls from drawing a seekbar.

Issue: androidx/media#1256
PiperOrigin-RevId: 624112541

RELEASENOTES.md

@@ -19,6 +19,9 @@
 *   Muxers:
 *   IMA extension:
 *   Session:
+    *   Hide seekbar in the media notification for live streams by not setting
+        the duration into the platform session metadata
+        ([#1256](https://github.com/androidx/media/issues/1256)).
 *   UI:
 *   Downloads:
 *   OkHttp Extension:

libraries/session/src/main/java/androidx/media3/session/MediaSessionLegacyStub.java

@@ -1292,7 +1292,10 @@ import org.checkerframework.checker.initialization.qual.Initialized;
       PlayerWrapper player = sessionImpl.getPlayerWrapper();
       @Nullable MediaItem currentMediaItem = player.getCurrentMediaItemWithCommandCheck();
       MediaMetadata newMediaMetadata = player.getMediaMetadataWithCommandCheck();
-      long newDurationMs = player.getDurationWithCommandCheck();
+      long newDurationMs =
+          player.isCurrentMediaItemLiveWithCommandCheck()
+              ? C.TIME_UNSET
+              : player.getDurationWithCommandCheck();
       String newMediaId =
           currentMediaItem != null ? currentMediaItem.mediaId : MediaItem.DEFAULT_MEDIA_ID;
       @Nullable

libraries/session/src/main/java/androidx/media3/session/PlayerWrapper.java

@@ -982,6 +982,10 @@ import java.util.List;
     return super.isCurrentMediaItemLive();
   }
 
+  public boolean isCurrentMediaItemLiveWithCommandCheck() {
+    return isCommandAvailable(COMMAND_GET_CURRENT_MEDIA_ITEM) && isCurrentMediaItemLive();
+  }
+
   @Override
   public boolean isCurrentMediaItemSeekable() {
     verifyApplicationThread();