@sh.add_function(dsp, outputs=['input_file'])
def open_input_file(input_file_name):
"""
Open the input file.
:param input_file_name:
Input file name.
:type input_file_name: str
:return:
Input file.
:rtype: io.BytesIO
"""
with open(input_file_name, 'rb') as file:
return io.BytesIO(file.read())