Turn on nullness checker for playback stats

The nullness checker complains about Integers with @IntDef annotations
so replace pairs with custom pair types for the timed event records in
PlaybackStats.

PiperOrigin-RevId: 284731834

library/core/src/main/java/com/google/android/exoplayer2/analytics/PlaybackStatsListener.java

@@ -16,7 +16,6 @@
 package com.google.android.exoplayer2.analytics;
 
 import android.os.SystemClock;
-import android.util.Pair;
 import androidx.annotation.Nullable;
 import com.google.android.exoplayer2.C;
 import com.google.android.exoplayer2.ExoPlaybackException;
@@ -25,6 +24,9 @@ import com.google.android.exoplayer2.PlaybackParameters;
 import com.google.android.exoplayer2.Player;
 import com.google.android.exoplayer2.Timeline;
 import com.google.android.exoplayer2.Timeline.Period;
+import com.google.android.exoplayer2.analytics.PlaybackStats.EventTimeAndException;
+import com.google.android.exoplayer2.analytics.PlaybackStats.EventTimeAndFormat;
+import com.google.android.exoplayer2.analytics.PlaybackStats.EventTimeAndPlaybackState;
 import com.google.android.exoplayer2.analytics.PlaybackStats.PlaybackState;
 import com.google.android.exoplayer2.source.LoadEventInfo;
 import com.google.android.exoplayer2.source.MediaLoadData;
@@ -42,7 +44,6 @@ import java.util.Collections;
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
-import org.checkerframework.checker.nullness.compatqual.NullableType;
 
 /**
  * {@link AnalyticsListener} to gather {@link PlaybackStats} from the player.
@@ -433,12 +434,12 @@ public final class PlaybackStatsListener
     // Final stats.
     private final boolean keepHistory;
     private final long[] playbackStateDurationsMs;
-    private final List<Pair<EventTime, @PlaybackState Integer>> playbackStateHistory;
+    private final List<EventTimeAndPlaybackState> playbackStateHistory;
     private final List<long[]> mediaTimeHistory;
-    private final List<Pair<EventTime, @NullableType Format>> videoFormatHistory;
-    private final List<Pair<EventTime, @NullableType Format>> audioFormatHistory;
-    private final List<Pair<EventTime, Exception>> fatalErrorHistory;
-    private final List<Pair<EventTime, Exception>> nonFatalErrorHistory;
+    private final List<EventTimeAndFormat> videoFormatHistory;
+    private final List<EventTimeAndFormat> audioFormatHistory;
+    private final List<EventTimeAndException> fatalErrorHistory;
+    private final List<EventTimeAndException> nonFatalErrorHistory;
     private final boolean isAd;
 
     private long firstReportedTimeMs;
@@ -589,7 +590,7 @@ public final class PlaybackStatsListener
     public void onFatalError(EventTime eventTime, Exception error) {
       fatalErrorCount++;
       if (keepHistory) {
-        fatalErrorHistory.add(Pair.create(eventTime, error));
+        fatalErrorHistory.add(new EventTimeAndException(eventTime, error));
       }
       hasFatalError = true;
       isInterruptedByAd = false;
@@ -743,7 +744,7 @@ public final class PlaybackStatsListener
     public void onNonFatalError(EventTime eventTime, Exception error) {
       nonFatalErrorCount++;
       if (keepHistory) {
-        nonFatalErrorHistory.add(Pair.create(eventTime, error));
+        nonFatalErrorHistory.add(new EventTimeAndException(eventTime, error));
       }
     }
 
@@ -776,9 +777,9 @@ public final class PlaybackStatsListener
               : playbackStateDurationsMs[PlaybackStats.PLAYBACK_STATE_JOINING_FOREGROUND];
       boolean hasBackgroundJoin =
           playbackStateDurationsMs[PlaybackStats.PLAYBACK_STATE_JOINING_BACKGROUND] > 0;
-      List<Pair<EventTime, @NullableType Format>> videoHistory =
+      List<EventTimeAndFormat> videoHistory =
           isFinal ? videoFormatHistory : new ArrayList<>(videoFormatHistory);
-      List<Pair<EventTime, @NullableType Format>> audioHistory =
+      List<EventTimeAndFormat> audioHistory =
           isFinal ? audioFormatHistory : new ArrayList<>(audioFormatHistory);
       return new PlaybackStats(
           /* playbackCount= */ 1,
@@ -864,7 +865,7 @@ public final class PlaybackStatsListener
       currentPlaybackState = newPlaybackState;
       currentPlaybackStateStartTimeMs = eventTime.realtimeMs;
       if (keepHistory) {
-        playbackStateHistory.add(Pair.create(eventTime, currentPlaybackState));
+        playbackStateHistory.add(new EventTimeAndPlaybackState(eventTime, currentPlaybackState));
       }
     }
 
@@ -973,7 +974,7 @@ public final class PlaybackStatsListener
       }
       currentVideoFormat = newFormat;
       if (keepHistory) {
-        videoFormatHistory.add(Pair.create(eventTime, currentVideoFormat));
+        videoFormatHistory.add(new EventTimeAndFormat(eventTime, currentVideoFormat));
       }
     }
 
@@ -989,7 +990,7 @@ public final class PlaybackStatsListener
       }
       currentAudioFormat = newFormat;
       if (keepHistory) {
-        audioFormatHistory.add(Pair.create(eventTime, currentAudioFormat));
+        audioFormatHistory.add(new EventTimeAndFormat(eventTime, currentAudioFormat));
       }
     }