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#!/usr/bin/env python
## 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 [un]mute # [un]mute the master mixer
## python mixertest.py Capture [un]rec # [dis/en]able capture
## python mixertest.py Master 0,[un]mute # [un]mute channel 0
## python mixertest.py Capture 0,[un]rec # [dis/en]able capture on channel 0
# 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
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.
try:
mixer = alsaaudio.Mixer(name, cardindex=idx)
except alsaaudio.ALSAAudioError:
sys.stderr.write("No such mixer\n")
sys.exit(1)
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)):
sys.stdout.write("Channel %i volume: %i%%\n" % (i,volumes[i]))
try:
mutes = mixer.getmute()
for i in range(len(mutes)):
if mutes[i]:
sys.stdout.write("Channel %i is muted\n" % i)
except alsaaudio.ALSAAudioError:
# May not support muting
pass
try:
recs = mixer.getrec()
for i in range(len(recs)):
if recs[i]:
sys.stdout.write("Channel %i is recording\n" % i)
except alsaaudio.ALSAAudioError:
# May not support recording
pass
def set_mixer(name, args, idx=0):
# Demonstrates how to set mixer settings
try:
mixer = alsaaudio.Mixer(name, cardindex=idx)
except alsaaudio.ALSAAudioError:
sys.stderr.write("No such mixer")
sys.exit(1)
if args.find(',') != -1:
args_array = args.split(',')
channel = int(args_array[0])
args = ','.join(args_array[1:])
else:
channel = alsaaudio.MIXER_CHANNEL_ALL
if args in ['mute', 'unmute']:
# Mute/unmute the mixer
if args == 'mute':
mixer.setmute(1, channel)
else:
mixer.setmute(0, channel)
elif args in ['rec','unrec']:
# Enable/disable recording
if args == 'rec':
mixer.setrec(1, channel)
else:
mixer.setrec(0, channel)
else:
# Set volume for specified channel. MIXER_CHANNEL_ALL means set
# volume for all channels
volume = int(args)
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:?h')
for o, a in opts:
if o == '-c':
cardindex = int(a)
else:
usage()
if not len(args):
list_mixers(cardindex)
elif len(args) == 1:
show_mixer(args[0], cardindex)
else:
set_mixer(args[0], args[1], cardindex)
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