def _filtering_step(self, basename):
name = '<STR_LIT>'.join(basename.split('<STR_LIT:.>')[:-<NUM_LIT:1>])<EOL>if basename.split('<STR_LIT:.>')[-<NUM_LIT:1>] == "<STR_LIT>":<EOL><INDENT>if self.get_verbosity():<EOL><INDENT>print("<STR_LIT>".format(<EOL>self.src_dir, basename))<EOL><DEDENT>subprocess.Popen(["<STR_LIT>", "<STR_LIT>".format(self.src_dir, name),<EOL>"<STR_LIT>".format(self.src_dir, name)],<EOL>universal_newlines=True).communicate()<EOL><DEDENT>
Moves the audio file if the format is `wav` to `filtered` directory.

Parameters
----------
basename : str
    A basename of `/home/random-guy/some-audio-file.wav` is
    `some-audio-file.wav`