This is release 0.4; it was tested with python2.5 and python3.0 (rc2 &

3)


git-svn-id: svn://svn.code.sf.net/p/pyalsaaudio/code/trunk@29 ec2f30ec-7544-0410-870e-f70ca00c83f0

mixertest.py

@@ -1,3 +1,5 @@
+#!/usr/bin/env python
+
 ## mixertest.py
 ##
 ## This is an example of using the ALSA mixer API
@@ -13,34 +15,40 @@
 ## python mixertest.py Master mute   # mute the master mixer
 ## python mixertest.py Master unmute # unmute the master mixer
 
-import alsaaudio
+
+# Footnote: I'd normally use print instead of sys.std(out|err).write,
+# but we're in the middle of the conversion between python 2 and 3
+# and this code runs on both versions without conversion
+
 import sys
+import getopt
+import alsaaudio
 
-if len(sys.argv) == 1:
-    # Demonstrates how to read the available mixers
-    print "Available mixer controls:"
-    for m in alsaaudio.mixers():
-        print "  '%s'" % m
-
-if len(sys.argv) == 2:
+def list_mixers(idx=0):
+    sys.stdout.write("Available mixer controls:\n")
+    for m in alsaaudio.mixers(idx):
+        sys.stdout.write("  '%s'\n" % m)
+    
+def show_mixer(name, idx=0):
     # Demonstrates how mixer settings are queried.
-    name = sys.argv[1]
     try:
-        mixer = alsaaudio.Mixer(name)
+        mixer = alsaaudio.Mixer(name, cardindex=idx)
     except alsaaudio.ALSAAudioError:
-        print "No such mixer"
+        sys.stderr.write("No such mixer\n")
         sys.exit(1)
 
-    print "Mixer name: '%s'"%mixer.mixer()
-    print "Capabilities",mixer.volumecap()+mixer.switchcap()
+    sys.stdout.write("Mixer name: '%s'\n" % mixer.mixer())
+    sys.stdout.write("Capabilities: %s %s\n" % (' '.join(mixer.volumecap()),
+                                                ' '.join(mixer.switchcap())))
     volumes = mixer.getvolume()
     for i in range(len(volumes)):
-        print "Channel %i volume: %i%%"%(i,volumes[i])
+        sys.stdout.write("Channel %i volume: %i%%\n" % (i,volumes[i]))
         
     try:
         mutes = mixer.getmute()
         for i in range(len(mutes)):
-            if mutes[i]: print "Channel %i is muted"%i
+            if mutes[i]:
+                sys.stdout.write("Channel %i is muted\n" % i)
     except alsaaudio.ALSAAudioError:
         # May not support muting
         pass
@@ -48,41 +56,65 @@ if len(sys.argv) == 2:
     try:
         recs = mixer.getrec()
         for i in range(len(recs)):
-            if recs[i]: print "Channel %i is recording"%i
+            if recs[i]:
+                sys.stdout.write("Channel %i is recording\n" % i)
     except alsaaudio.ALSAAudioError:
         # May not support recording
         pass
 
-if (len(sys.argv)) == 3:
+def set_mixer(name, args, idx=0):
     # Demonstrates how to set mixer settings
-    name = sys.argv[1]
     try:
-        mixer = alsaaudio.Mixer(name)
+        mixer = alsaaudio.Mixer(name, cardindex=idx)
     except alsaaudio.ALSAAudioError:
-        print "No such mixer"
+        sys.stderr.write("No such mixer")
         sys.exit(1)
 
-    args = sys.argv[2]
     if args in ['mute','unmute']:
         # Mute/unmute the mixer
-        if args == 'mute': mixer.setmute(1)
-        else: mixer.setmute(0)
-        sys.exit(0)
-    if args in ['rec','unrec']:
-        # Enable/disable recording
-        if args == 'rec': mixer.setrec(1)
-        else: mixer.setrec(0)
+        if args == 'mute':
+            mixer.setmute(1)
+        else:
+            mixer.setmute(0)
         sys.exit(0)
         
+    if args in ['rec','unrec']:
+        # Enable/disable recording
+        if args == 'rec':
+            mixer.setrec(1)
+        else:
+            mixer.setrec(0)
+        sys.exit(0)
             
-    if args.find(',')!=-1:
+    if args.find(',') != -1:
         channel,volume = map(int,args.split(','))
     else:
         channel = alsaaudio.MIXER_CHANNEL_ALL
         volume = int(args)
     # Set volume for specified channel. MIXER_CHANNEL_ALL means set
     # volume for all channels
-    mixer.setvolume(volume,channel)
+    mixer.setvolume(volume, channel)
+
+def usage():
+    sys.stderr.write('usage: mixertest.py [-c <card>] ' \
+                     '[ <control>[,<value>]]\n')
+    sys.exit(2)
+
+if __name__ == '__main__':
+
+    cardindex = 0
+    opts, args = getopt.getopt(sys.argv[1:], 'c:')
+    for o, a in opts:
+        if o == '-c':
+            cardindex = int(a)
+
+    if not len(args):
+        list_mixers(cardindex)
+    elif len(args) == 1:
+        show_mixer(args[0], cardindex)
+    else:
+        set_mixer(args[0], args[1], cardindex)
+