Make tests more robust, use devices or card indices.

playbacktest.py

@@ -21,17 +21,17 @@ import getopt
 import alsaaudio
 
 def usage():
-    print('usage: playbacktest.py [-c <card>] <file>', file=sys.stderr)
+    print('usage: playbacktest.py [-d <device>] <file>', file=sys.stderr)
     sys.exit(2)
 
 if __name__ == '__main__':
 
-    card = 'default'
+    device = 'default'
 
-    opts, args = getopt.getopt(sys.argv[1:], 'c:')
+    opts, args = getopt.getopt(sys.argv[1:], 'd:')
     for o, a in opts:
-        if o == '-c':
-            card = a
+        if o == '-d':
+            device = a
 
     if not args:
         usage()
@@ -39,7 +39,7 @@ if __name__ == '__main__':
     f = open(args[0], 'rb')
 
     # Open the device in playback mode. 
-    out = alsaaudio.PCM(alsaaudio.PCM_PLAYBACK, card=card)
+    out = alsaaudio.PCM(alsaaudio.PCM_PLAYBACK, device=device)
 
     # Set attributes: Mono, 44100 Hz, 16 bit little endian frames
     out.setchannels(1)