Clean up UnboundedIntArray

library/extractor/src/main/java/com/google/android/exoplayer2/extractor/avi/UnboundedIntArray.java

 package com.google.android.exoplayer2.extractor.avi;
 
 import androidx.annotation.NonNull;
+import androidx.annotation.VisibleForTesting;
 import java.util.Arrays;
 
 public class UnboundedIntArray {
   @NonNull
+  @VisibleForTesting
   int[] array;
   //unint
-  int size =0;
+  private int size =0;
 
   public UnboundedIntArray() {
     this(8);
@@ -32,7 +34,9 @@ public class UnboundedIntArray {
   }
 
   public void pack() {
-    array = Arrays.copyOf(array, size);
+    if (size != array.length) {
+      array = Arrays.copyOf(array, size);
+    }
   }
 
   protected void grow() {
@@ -40,6 +44,11 @@ public class UnboundedIntArray {
     array = Arrays.copyOf(array, increase + array.length + size);
   }
 
+  public int[] getArray() {
+    pack();
+    return array;
+  }
+
   /**
    * Only works if values are in sequential order
    * @param v

library/extractor/src/test/java/com/google/android/exoplayer2/extractor/avi/UnboundedIntArrayTest.java

@@ -9,7 +9,7 @@ public class UnboundedIntArrayTest {
     final UnboundedIntArray unboundedIntArray = new UnboundedIntArray();
     unboundedIntArray.add(4);
     Assert.assertEquals(1, unboundedIntArray.getSize());
-    Assert.assertEquals(unboundedIntArray.array[0], 4);
+    Assert.assertEquals(unboundedIntArray.getArray()[0], 4);
   }
 
   @Test