Swap reading and playing media period updates.

Both periods are rarely updated in the same iteration. If they are, advancing
the reading period first seems more logical and also more efficient as it may
avoid one extra doSomeWork iteration.

PiperOrigin-RevId: 260463735

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

@@ -1491,8 +1491,8 @@ import java.util.concurrent.atomic.AtomicBoolean;
       return;
     }
     maybeUpdateLoadingPeriod();
-    maybeUpdatePlayingPeriod();
     maybeUpdateReadingPeriod();
+    maybeUpdatePlayingPeriod();
   }
 
   private void maybeUpdateLoadingPeriod() throws IOException {
@@ -1518,32 +1518,6 @@ import java.util.concurrent.atomic.AtomicBoolean;
     }
   }
 
-  private void maybeUpdatePlayingPeriod() throws ExoPlaybackException {
-    boolean advancedPlayingPeriod = false;
-    while (shouldAdvancePlayingPeriod()) {
-      if (advancedPlayingPeriod) {
-        // If we advance more than one period at a time, notify listeners after each update.
-        maybeNotifyPlaybackInfoChanged();
-      }
-      MediaPeriodHolder oldPlayingPeriodHolder = queue.getPlayingPeriod();
-      MediaPeriodHolder newPlayingPeriodHolder = queue.advancePlayingPeriod();
-      updatePlayingPeriodRenderers(oldPlayingPeriodHolder);
-      playbackInfo =
-          playbackInfo.copyWithNewPosition(
-              newPlayingPeriodHolder.info.id,
-              newPlayingPeriodHolder.info.startPositionUs,
-              newPlayingPeriodHolder.info.contentPositionUs,
-              getTotalBufferedDurationUs());
-      int discontinuityReason =
-          oldPlayingPeriodHolder.info.isLastInTimelinePeriod
-              ? Player.DISCONTINUITY_REASON_PERIOD_TRANSITION
-              : Player.DISCONTINUITY_REASON_AD_INSERTION;
-      playbackInfoUpdate.setPositionDiscontinuity(discontinuityReason);
-      updatePlaybackPositions();
-      advancedPlayingPeriod = true;
-    }
-  }
-
   private void maybeUpdateReadingPeriod() throws ExoPlaybackException, IOException {
     MediaPeriodHolder readingPeriodHolder = queue.getReadingPeriod();
     if (readingPeriodHolder == null) {
@@ -1621,6 +1595,32 @@ import java.util.concurrent.atomic.AtomicBoolean;
     }
   }
 
+  private void maybeUpdatePlayingPeriod() throws ExoPlaybackException {
+    boolean advancedPlayingPeriod = false;
+    while (shouldAdvancePlayingPeriod()) {
+      if (advancedPlayingPeriod) {
+        // If we advance more than one period at a time, notify listeners after each update.
+        maybeNotifyPlaybackInfoChanged();
+      }
+      MediaPeriodHolder oldPlayingPeriodHolder = queue.getPlayingPeriod();
+      MediaPeriodHolder newPlayingPeriodHolder = queue.advancePlayingPeriod();
+      updatePlayingPeriodRenderers(oldPlayingPeriodHolder);
+      playbackInfo =
+          playbackInfo.copyWithNewPosition(
+              newPlayingPeriodHolder.info.id,
+              newPlayingPeriodHolder.info.startPositionUs,
+              newPlayingPeriodHolder.info.contentPositionUs,
+              getTotalBufferedDurationUs());
+      int discontinuityReason =
+          oldPlayingPeriodHolder.info.isLastInTimelinePeriod
+              ? Player.DISCONTINUITY_REASON_PERIOD_TRANSITION
+              : Player.DISCONTINUITY_REASON_AD_INSERTION;
+      playbackInfoUpdate.setPositionDiscontinuity(discontinuityReason);
+      updatePlaybackPositions();
+      advancedPlayingPeriod = true;
+    }
+  }
+
   private boolean shouldAdvancePlayingPeriod() {
     if (!playWhenReady) {
       return false;