wave: fix filename argument usage

amodem/calib.py

@@ -14,7 +14,7 @@ fmt = 'coherence={:.3f} amplitude={:.3f} phase={:+.1f} peak={:.3f}\n'
 
 
 def send(wave_play=wave.play):
-    p = wave_play('-', stdin=wave.sp.PIPE, stderr=open('/dev/null'))
+    p = wave_play(stdin=wave.sp.PIPE, stderr=open('/dev/null'))
     try:
         while True:
             try:
@@ -26,7 +26,7 @@ def send(wave_play=wave.play):
 
 
 def recv(wave_record=wave.record, reporter=sys.stdout.write):
-    p = wave_record('-', stdout=wave.sp.PIPE)
+    p = wave_record(stdout=wave.sp.PIPE)
     try:
         while True:
             data = p.stdout.read(len(sig_dump))

amodem/wave.py

@@ -16,7 +16,7 @@ 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='-', **kwargs):
     args = [tool, fname, '-q', '-f', audio_format, '-c', '1', '-r', str(Fs)]
     log.debug('running: %r', args)
     p = sp.Popen(args=args, **kwargs)

scripts/wave.py

@@ -21,7 +21,7 @@ player.add_argument(
 player.set_defaults(func=wave.play)
 
 args = parser.parse_args()
-p = args.func(args.filename)
+p = args.func(fname=args.filename)
 
 import sys
 exitcode = 0