code: @Override
      public IoBuffer getDecoderConfiguration() {
          if (blockDataAACDCR == null) {
              return null;
          }
          IoBuffer result = IoBuffer.allocate(4);
          result.setAutoExpand(true);
          result.put(blockDataAACDCR);
          result.rewind();
          return result;
      }
docs: {@inheritDoc}