@Override
 protected void onEnabled(int track, long positionUs, boolean joining)
     throws ExoPlaybackException {
   super.onEnabled(track, positionUs, joining);
   if (joining && allowedJoiningTimeUs > 0) {
     joiningDeadlineUs = SystemClock.elapsedRealtime() * 1000L + allowedJoiningTimeUs;
   }
   frameReleaseTimeHelper.enable();
 }