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https://github.com/larsimmisch/pyalsaaudio.git
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larsimmisch
fc3517b00e
3) git-svn-id: svn://svn.code.sf.net/p/pyalsaaudio/code/trunk@29 ec2f30ec-7544-0410-870e-f70ca00c83f0
121 lines
3.4 KiB
Python
Executable File
121 lines
3.4 KiB
Python
Executable File
#!/usr/bin/env python
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## mixertest.py
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##
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## This is an example of using the ALSA mixer API
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##
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## The script will set the volume or mute switch of the specified Mixer
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## depending on command line options.
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##
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## Examples:
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## python mixertest.py # list available mixers
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## python mixertest.py Master # show Master mixer settings
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## python mixertest.py Master 80 # set the master volume to 80%
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## python mixertest.py Master 1,90 # set channel 1 volume to 90%
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## python mixertest.py Master mute # mute the master mixer
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## python mixertest.py Master unmute # unmute the master mixer
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# Footnote: I'd normally use print instead of sys.std(out|err).write,
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# but we're in the middle of the conversion between python 2 and 3
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# and this code runs on both versions without conversion
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import sys
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import getopt
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import alsaaudio
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def list_mixers(idx=0):
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sys.stdout.write("Available mixer controls:\n")
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for m in alsaaudio.mixers(idx):
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sys.stdout.write(" '%s'\n" % m)
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def show_mixer(name, idx=0):
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# Demonstrates how mixer settings are queried.
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try:
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mixer = alsaaudio.Mixer(name, cardindex=idx)
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except alsaaudio.ALSAAudioError:
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sys.stderr.write("No such mixer\n")
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sys.exit(1)
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sys.stdout.write("Mixer name: '%s'\n" % mixer.mixer())
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sys.stdout.write("Capabilities: %s %s\n" % (' '.join(mixer.volumecap()),
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' '.join(mixer.switchcap())))
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volumes = mixer.getvolume()
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for i in range(len(volumes)):
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sys.stdout.write("Channel %i volume: %i%%\n" % (i,volumes[i]))
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try:
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mutes = mixer.getmute()
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for i in range(len(mutes)):
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if mutes[i]:
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sys.stdout.write("Channel %i is muted\n" % i)
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except alsaaudio.ALSAAudioError:
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# May not support muting
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pass
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try:
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recs = mixer.getrec()
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for i in range(len(recs)):
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if recs[i]:
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sys.stdout.write("Channel %i is recording\n" % i)
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except alsaaudio.ALSAAudioError:
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# May not support recording
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pass
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def set_mixer(name, args, idx=0):
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# Demonstrates how to set mixer settings
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try:
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mixer = alsaaudio.Mixer(name, cardindex=idx)
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except alsaaudio.ALSAAudioError:
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sys.stderr.write("No such mixer")
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sys.exit(1)
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if args in ['mute','unmute']:
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# Mute/unmute the mixer
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if args == 'mute':
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mixer.setmute(1)
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else:
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mixer.setmute(0)
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sys.exit(0)
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if args in ['rec','unrec']:
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# Enable/disable recording
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if args == 'rec':
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mixer.setrec(1)
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else:
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mixer.setrec(0)
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sys.exit(0)
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if args.find(',') != -1:
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channel,volume = map(int,args.split(','))
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else:
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channel = alsaaudio.MIXER_CHANNEL_ALL
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volume = int(args)
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# Set volume for specified channel. MIXER_CHANNEL_ALL means set
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# volume for all channels
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mixer.setvolume(volume, channel)
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def usage():
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sys.stderr.write('usage: mixertest.py [-c <card>] ' \
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'[ <control>[,<value>]]\n')
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sys.exit(2)
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if __name__ == '__main__':
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cardindex = 0
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opts, args = getopt.getopt(sys.argv[1:], 'c:')
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for o, a in opts:
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if o == '-c':
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cardindex = int(a)
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if not len(args):
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list_mixers(cardindex)
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elif len(args) == 1:
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show_mixer(args[0], cardindex)
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else:
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set_mixer(args[0], args[1], cardindex)
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