docs: public void extract(@NotNull final RandomAccessReader reader, @NotNull final Metadata metadata)
      {
          JfxxDirectory directory = new JfxxDirectory();
          metadata.addDirectory(directory);
  
          try {
              // For JFXX, the tag number is also the offset into the segment
  
              directory.setInt(JfxxDirectory.TAG_EXTENSION_CODE, reader.getUInt8(JfxxDirectory.TAG_EXTENSION_CODE));
          } catch (IOException me) {
              directory.addError(me.getMessage());
          }
      }