Make tests more robust, use devices or card indices.

recordtest.py

@@ -4,7 +4,7 @@
 ##
 ## This is an example of a simple sound capture script.
 ##
-## The script opens an ALSA pcm forsound capture. Set
+## The script opens an ALSA pcm device for sound capture, sets
 ## various attributes of the capture, and reads in a loop,
 ## writing the data to standard out.
 ##
@@ -22,17 +22,17 @@ import getopt
 import alsaaudio
 
 def usage():
-    print('usage: recordtest.py [-c <card>] <file>', file=sys.stderr)
+    print('usage: recordtest.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()
@@ -42,7 +42,7 @@ if __name__ == '__main__':
     # Open the device in nonblocking capture mode. The last argument could
     # just as well have been zero for blocking mode. Then we could have
     # left out the sleep call in the bottom of the loop
-    inp = alsaaudio.PCM(alsaaudio.PCM_CAPTURE, alsaaudio.PCM_NONBLOCK, card)
+    inp = alsaaudio.PCM(alsaaudio.PCM_CAPTURE, alsaaudio.PCM_NONBLOCK, device=device)
 
     # Set attributes: Mono, 44100 Hz, 16 bit little endian samples
     inp.setchannels(1)