Enable nullness checks for more easy files

PiperOrigin-RevId: 322586013

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

@@ -15,6 +15,7 @@
  */
 package com.google.android.exoplayer2;
 
+import androidx.annotation.Nullable;
 import com.google.android.exoplayer2.source.TrackGroupArray;
 import com.google.android.exoplayer2.trackselection.TrackSelectionArray;
 import com.google.android.exoplayer2.upstream.Allocator;
@@ -94,7 +95,7 @@ public class DefaultLoadControl implements LoadControl {
   /** Builder for {@link DefaultLoadControl}. */
   public static final class Builder {
 
-    private DefaultAllocator allocator;
+    @Nullable private DefaultAllocator allocator;
     private int minBufferMs;
     private int maxBufferMs;
     private int bufferForPlaybackMs;

library/core/src/main/java/com/google/android/exoplayer2/mediacodec/MediaCodecInfo.java

@@ -328,7 +328,7 @@ public final class MediaCodecInfo {
   public boolean isSeamlessAdaptationSupported(
       Format oldFormat, Format newFormat, boolean isNewFormatComplete) {
     if (isVideo) {
-      return oldFormat.sampleMimeType.equals(newFormat.sampleMimeType)
+      return Assertions.checkNotNull(oldFormat.sampleMimeType).equals(newFormat.sampleMimeType)
           && oldFormat.rotationDegrees == newFormat.rotationDegrees
           && (adaptive
               || (oldFormat.width == newFormat.width && oldFormat.height == newFormat.height))
@@ -336,14 +336,16 @@ public final class MediaCodecInfo {
               || Util.areEqual(oldFormat.colorInfo, newFormat.colorInfo));
     } else {
       if (!MimeTypes.AUDIO_AAC.equals(mimeType)
-          || !oldFormat.sampleMimeType.equals(newFormat.sampleMimeType)
+          || !Assertions.checkNotNull(oldFormat.sampleMimeType).equals(newFormat.sampleMimeType)
           || oldFormat.channelCount != newFormat.channelCount
           || oldFormat.sampleRate != newFormat.sampleRate) {
         return false;
       }
       // Check the codec profile levels support adaptation.
+      @Nullable
       Pair<Integer, Integer> oldCodecProfileLevel =
           MediaCodecUtil.getCodecProfileAndLevel(oldFormat);
+      @Nullable
       Pair<Integer, Integer> newCodecProfileLevel =
           MediaCodecUtil.getCodecProfileAndLevel(newFormat);
       if (oldCodecProfileLevel == null || newCodecProfileLevel == null) {
@@ -402,6 +404,7 @@ public final class MediaCodecInfo {
    *     the {@link MediaCodec}'s width and height alignment requirements, or null if not a video
    *     codec.
    */
+  @Nullable
   @RequiresApi(21)
   public Point alignVideoSizeV21(int width, int height) {
     if (capabilities == null) {

library/core/src/main/java/com/google/android/exoplayer2/upstream/DefaultAllocator.java

@@ -19,6 +19,7 @@ import androidx.annotation.Nullable;
 import com.google.android.exoplayer2.util.Assertions;
 import com.google.android.exoplayer2.util.Util;
 import java.util.Arrays;
+import org.checkerframework.checker.nullness.compatqual.NullableType;
 
 /**
  * Default implementation of {@link Allocator}.
@@ -35,7 +36,7 @@ public final class DefaultAllocator implements Allocator {
   private int targetBufferSize;
   private int allocatedCount;
   private int availableCount;
-  private Allocation[] availableAllocations;
+  @NullableType private Allocation[] availableAllocations;
 
   /**
    * Constructs an instance without creating any {@link Allocation}s up front.
@@ -97,7 +98,7 @@ public final class DefaultAllocator implements Allocator {
     allocatedCount++;
     Allocation allocation;
     if (availableCount > 0) {
-      allocation = availableAllocations[--availableCount];
+      allocation = Assertions.checkNotNull(availableAllocations[--availableCount]);
       availableAllocations[availableCount] = null;
     } else {
       allocation = new Allocation(new byte[individualAllocationSize], 0);
@@ -141,11 +142,11 @@ public final class DefaultAllocator implements Allocator {
       int lowIndex = 0;
       int highIndex = availableCount - 1;
       while (lowIndex <= highIndex) {
-        Allocation lowAllocation = availableAllocations[lowIndex];
+        Allocation lowAllocation = Assertions.checkNotNull(availableAllocations[lowIndex]);
         if (lowAllocation.data == initialAllocationBlock) {
           lowIndex++;
         } else {
-          Allocation highAllocation = availableAllocations[highIndex];
+          Allocation highAllocation = Assertions.checkNotNull(availableAllocations[highIndex]);
           if (highAllocation.data != initialAllocationBlock) {
             highIndex--;
           } else {