Add NonNull at package level for extractor

PiperOrigin-RevId: 286381499

library/core/src/main/java/com/google/android/exoplayer2/extractor/BinarySearchSeeker.java

@@ -91,7 +91,7 @@ public abstract class BinarySearchSeeker {
 
   protected final BinarySearchSeekMap seekMap;
   protected final TimestampSeeker timestampSeeker;
-  protected @Nullable SeekOperationParams seekOperationParams;
+  @Nullable protected SeekOperationParams seekOperationParams;
 
   private final int minimumSearchRange;
 
@@ -173,7 +173,6 @@ public abstract class BinarySearchSeeker {
    */
   public int handlePendingSeek(ExtractorInput input, PositionHolder seekPositionHolder)
       throws InterruptedException, IOException {
-    TimestampSeeker timestampSeeker = Assertions.checkNotNull(this.timestampSeeker);
     while (true) {
       SeekOperationParams seekOperationParams = Assertions.checkNotNull(this.seekOperationParams);
       long floorPosition = seekOperationParams.getFloorBytePosition();

library/core/src/main/java/com/google/android/exoplayer2/extractor/ChunkIndex.java

@@ -76,7 +76,7 @@ public final class ChunkIndex implements SeekMap {
    * @return The index of the corresponding chunk.
    */
   public int getChunkIndex(long timeUs) {
-    return Util.binarySearchFloor(timesUs, timeUs, true, true);
+    return Util.binarySearchFloor(timesUs, timeUs, /* inclusive= */ true, /* stayInBounds= */ true);
   }
 
   // SeekMap implementation.

library/core/src/main/java/com/google/android/exoplayer2/extractor/DefaultExtractorsFactory.java

@@ -15,6 +15,7 @@
  */
 package com.google.android.exoplayer2.extractor;
 
+import androidx.annotation.Nullable;
 import com.google.android.exoplayer2.extractor.amr.AmrExtractor;
 import com.google.android.exoplayer2.extractor.flac.FlacExtractor;
 import com.google.android.exoplayer2.extractor.flv.FlvExtractor;
@@ -56,10 +57,11 @@ import java.lang.reflect.Constructor;
  */
 public final class DefaultExtractorsFactory implements ExtractorsFactory {
 
+  @Nullable
   private static final Constructor<? extends Extractor> FLAC_EXTENSION_EXTRACTOR_CONSTRUCTOR;
 
   static {
-    Constructor<? extends Extractor> flacExtensionExtractorConstructor = null;
+    @Nullable Constructor<? extends Extractor> flacExtensionExtractorConstructor = null;
     try {
       // LINT.IfChange
       flacExtensionExtractorConstructor =

library/core/src/main/java/com/google/android/exoplayer2/extractor/FlacMetadataReader.java

@@ -171,7 +171,7 @@ public final class FlacMetadataReader {
     if (type == FlacConstants.METADATA_TYPE_STREAM_INFO) {
       metadataHolder.flacStreamMetadata = readStreamInfoBlock(input);
     } else {
-      FlacStreamMetadata flacStreamMetadata = metadataHolder.flacStreamMetadata;
+      @Nullable FlacStreamMetadata flacStreamMetadata = metadataHolder.flacStreamMetadata;
       if (flacStreamMetadata == null) {
         throw new IllegalArgumentException();
       }

library/core/src/main/java/com/google/android/exoplayer2/extractor/GaplessInfoHolder.java

@@ -15,6 +15,8 @@
  */
 package com.google.android.exoplayer2.extractor;
 
+import static com.google.android.exoplayer2.util.Util.castNonNull;
+
 import com.google.android.exoplayer2.Format;
 import com.google.android.exoplayer2.metadata.Metadata;
 import com.google.android.exoplayer2.metadata.id3.CommentFrame;
@@ -107,8 +109,8 @@ public final class GaplessInfoHolder {
     Matcher matcher = GAPLESS_COMMENT_PATTERN.matcher(data);
     if (matcher.find()) {
       try {
-        int encoderDelay = Integer.parseInt(matcher.group(1), 16);
+        int encoderDelay = Integer.parseInt(castNonNull(matcher.group(1)), 16);
-        int encoderPadding = Integer.parseInt(matcher.group(2), 16);
+        int encoderPadding = Integer.parseInt(castNonNull(matcher.group(2)), 16);
         if (encoderDelay > 0 || encoderPadding > 0) {
           this.encoderDelay = encoderDelay;
           this.encoderPadding = encoderPadding;

library/core/src/main/java/com/google/android/exoplayer2/extractor/Id3Peeker.java

@@ -50,7 +50,7 @@ public final class Id3Peeker {
       ExtractorInput input, @Nullable Id3Decoder.FramePredicate id3FramePredicate)
       throws IOException, InterruptedException {
     int peekedId3Bytes = 0;
-    Metadata metadata = null;
+    @Nullable Metadata metadata = null;
     while (true) {
       try {
         input.peekFully(scratch.data, /* offset= */ 0, Id3Decoder.ID3_HEADER_LENGTH);

library/core/src/main/java/com/google/android/exoplayer2/extractor/package-info.java

@@ -0,0 +1,19 @@
+/*
+ * Copyright (C) 2019 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+@NonNullApi
+package com.google.android.exoplayer2.extractor;
+
+import com.google.android.exoplayer2.util.NonNullApi;