Unpacked to Packed gr_unpacked_to_packed_xx from gnuradio import gr gr.unpacked_to_packed_$(type.fcn)($bits_per_chunk, $endianness) Type type enum Int int fcn:ii Short short fcn:ss Byte byte fcn:bb Bits per Chunk bits_per_chunk 2 int Endianness endianness enum MSB gr.GR_MSB_FIRST LSB gr.GR_LSB_FIRST in $type out $type