def __enter__(self):
if self.src_dir is not None:<EOL><INDENT>for directory in self._needed_directories:<EOL><INDENT>if not os.path.exists("<STR_LIT>".format(<EOL>self.src_dir, directory)):<EOL><INDENT>os.mkdir("<STR_LIT>".format(self.src_dir, directory))<EOL><DEDENT><DEDENT><DEDENT>return self<EOL>
Creates the needed directories for audio processing. Will only be
called if the instance is initialized within a context manager.