Remove DefaultHlsExtractorFactory from null-checking blacklist

PiperOrigin-RevId: 274537528

library/hls/src/main/java/com/google/android/exoplayer2/source/hls/DefaultHlsExtractorFactory.java

@@ -185,8 +185,8 @@ public final class DefaultHlsExtractorFactory implements HlsExtractorFactory {
   private Extractor createExtractorByFileExtension(
   private Extractor createExtractorByFileExtension(
       Uri uri,
       Uri uri,
       Format format,
       Format format,
-      List<Format> muxedCaptionFormats,
-      DrmInitData drmInitData,
+      @Nullable List<Format> muxedCaptionFormats,
+      @Nullable DrmInitData drmInitData,
       TimestampAdjuster timestampAdjuster) {
       TimestampAdjuster timestampAdjuster) {
     String lastPathSegment = uri.getLastPathSegment();
     String lastPathSegment = uri.getLastPathSegment();
     if (lastPathSegment == null) {
     if (lastPathSegment == null) {
@@ -226,7 +226,7 @@ public final class DefaultHlsExtractorFactory implements HlsExtractorFactory {
       @DefaultTsPayloadReaderFactory.Flags int userProvidedPayloadReaderFactoryFlags,
       @DefaultTsPayloadReaderFactory.Flags int userProvidedPayloadReaderFactoryFlags,
       boolean exposeCea608WhenMissingDeclarations,
       boolean exposeCea608WhenMissingDeclarations,
       Format format,
       Format format,
-      List<Format> muxedCaptionFormats,
+      @Nullable List<Format> muxedCaptionFormats,
       TimestampAdjuster timestampAdjuster) {
       TimestampAdjuster timestampAdjuster) {
     @DefaultTsPayloadReaderFactory.Flags
     @DefaultTsPayloadReaderFactory.Flags
     int payloadReaderFactoryFlags =
     int payloadReaderFactoryFlags =
@@ -270,26 +270,34 @@ public final class DefaultHlsExtractorFactory implements HlsExtractorFactory {
   private static FragmentedMp4Extractor createFragmentedMp4Extractor(
   private static FragmentedMp4Extractor createFragmentedMp4Extractor(
       TimestampAdjuster timestampAdjuster,
       TimestampAdjuster timestampAdjuster,
       Format format,
       Format format,
-      DrmInitData drmInitData,
+      @Nullable DrmInitData drmInitData,
       @Nullable List<Format> muxedCaptionFormats) {
       @Nullable List<Format> muxedCaptionFormats) {
-    boolean isVariant = false;
-    for (int i = 0; i < format.metadata.length(); i++) {
-      Metadata.Entry entry = format.metadata.get(i);
-      if (entry instanceof HlsTrackMetadataEntry) {
-        isVariant = !((HlsTrackMetadataEntry) entry).variantInfos.isEmpty();
-        break;
-      }
-    }
     // Only enable the EMSG TrackOutput if this is the 'variant' track (i.e. the main one) to avoid
     // Only enable the EMSG TrackOutput if this is the 'variant' track (i.e. the main one) to avoid
     // creating a separate EMSG track for every audio track in a video stream.
     // creating a separate EMSG track for every audio track in a video stream.
     return new FragmentedMp4Extractor(
     return new FragmentedMp4Extractor(
-        /* flags= */ isVariant ? FragmentedMp4Extractor.FLAG_ENABLE_EMSG_TRACK : 0,
+        /* flags= */ isFmp4Variant(format) ? FragmentedMp4Extractor.FLAG_ENABLE_EMSG_TRACK : 0,
         timestampAdjuster,
         timestampAdjuster,
         /* sideloadedTrack= */ null,
         /* sideloadedTrack= */ null,
         drmInitData,
         drmInitData,
         muxedCaptionFormats != null ? muxedCaptionFormats : Collections.emptyList());
         muxedCaptionFormats != null ? muxedCaptionFormats : Collections.emptyList());
   }
   }
 
 
+  /** Returns true if this {@code format} represents a 'variant' track (i.e. the main one). */
+  private static boolean isFmp4Variant(Format format) {
+    Metadata metadata = format.metadata;
+    if (metadata == null) {
+      return false;
+    }
+    for (int i = 0; i < metadata.length(); i++) {
+      Metadata.Entry entry = metadata.get(i);
+      if (entry instanceof HlsTrackMetadataEntry) {
+        return !((HlsTrackMetadataEntry) entry).variantInfos.isEmpty();
+      }
+    }
+    return false;
+  }
+
+  @Nullable
   private static Result buildResultForSameExtractorType(
   private static Result buildResultForSameExtractorType(
       Extractor previousExtractor, Format format, TimestampAdjuster timestampAdjuster) {
       Extractor previousExtractor, Format format, TimestampAdjuster timestampAdjuster) {
     if (previousExtractor instanceof WebvttExtractor) {
     if (previousExtractor instanceof WebvttExtractor) {