From f0ff9c22ff6a16588631902a7c4322d6067df0db Mon Sep 17 00:00:00 2001
From: Roman Zeyde <roman.zeyde@gmail.com>
Date: Fri, 12 Sep 2014 19:16:08 +0300
Subject: [PATCH] wave: use stdin/stdout if fname is None

---
 amodem/wave.py | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/amodem/wave.py b/amodem/wave.py
index 19e9a30..c735c14 100644
--- a/amodem/wave.py
+++ b/amodem/wave.py
@@ -14,7 +14,8 @@ bytes_per_second = bytes_per_sample * Fs
 audio_format = 'S{}_LE'.format(bits_per_sample)  # PCM signed little endian
 
 
-def launch(tool, fname='-', **kwargs):
+def launch(tool, fname=None, **kwargs):
+    fname = fname or '-'
     args = [tool, fname, '-q', '-f', audio_format, '-c', '1', '-r', str(Fs)]
     log.debug('Running: %r', args)
     p = sp.Popen(args=args, **kwargs)