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## mixertest.py
##
## This is an example of using the ALSA mixer API
##
## The script will set the volume or mute switch of the specified Mixer
## depending on command line options.
##
## Examples:
## python mixertest.py # list available mixers
## python mixertest.py Master # show Master mixer settings
## python mixertest.py Master 80 # set the master volume to 80%
## python mixertest.py Master 1,90 # set channel 1 volume to 90%
## python mixertest.py Master mute # mute the master mixer
## python mixertest.py Master unmute # unmute the master mixer
import alsaaudio
import sys
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:
# Demonstrates how mixer settings are queried.
name = sys.argv[1]
try:
mixer = alsaaudio.Mixer(name)
except alsaaudio.ALSAAudioError:
print "No such mixer"
sys.exit(1)
print "Mixer name: '%s'"%mixer.mixer()
print "Capabilities",mixer.volumecap()+mixer.switchcap()
volumes = mixer.getvolume()
for i in range(len(volumes)):
print "Channel %i volume: %i%%"%(i,volumes[i])
try:
mutes = mixer.getmute()
for i in range(len(mutes)):
if mutes[i]: print "Channel %i is muted"%i
except alsaaudio.ALSAAudioError:
# May not support muting
pass
try:
recs = mixer.getrec()
for i in range(len(recs)):
if recs[i]: print "Channel %i is recording"%i
except alsaaudio.ALSAAudioError:
# May not support recording
pass
if (len(sys.argv)) == 3:
# Demonstrates how to set mixer settings
name = sys.argv[1]
try:
mixer = alsaaudio.Mixer(name)
except alsaaudio.ALSAAudioError:
print "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)
sys.exit(0)
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)
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