48 lines
1.6 KiB
Python
48 lines
1.6 KiB
Python
import alsaaudio
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import logging
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from mopidy import settings
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from mopidy.mixers import BaseMixer
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logger = logging.getLogger('mopidy.mixers.alsa')
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class AlsaMixer(BaseMixer):
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"""
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Mixer which uses the Advanced Linux Sound Architecture (ALSA) to control
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volume.
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"""
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def __init__(self, *args, **kwargs):
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super(AlsaMixer, self).__init__(*args, **kwargs)
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self._mixer = alsaaudio.Mixer(self._get_mixer_control())
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assert self._mixer is not None
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def _get_mixer_control(self):
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"""Returns the first mixer control candidate that is known to ALSA"""
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candidates = self._get_mixer_control_candidates()
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for control in candidates:
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if control in alsaaudio.mixers():
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logger.info(u'Mixer control in use: %s', control)
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return control
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else:
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logger.debug(u'Mixer control not found, skipping: %s', control)
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logger.warning(u'No working mixer controls found. Tried: %s',
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candidates)
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def _get_mixer_control_candidates(self):
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"""
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A mixer named 'Master' does not always exist, so we fall back to using
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'PCM'. If this does not work for you, you may set
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:attr:`mopidy.settings.MIXER_ALSA_CONTROL`.
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"""
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if settings.MIXER_ALSA_CONTROL:
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return [settings.MIXER_ALSA_CONTROL]
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return [u'Master', u'PCM']
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def _get_volume(self):
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# FIXME does not seem to see external volume changes.
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return self._mixer.getvolume()[0]
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def _set_volume(self, volume):
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self._mixer.setvolume(volume)
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