56 lines
1.4 KiB
Python
56 lines
1.4 KiB
Python
from mopidy import settings
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class BaseMixer(object):
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"""
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:param backend: a backend instance
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:type mixer: :class:`mopidy.backends.base.BaseBackend`
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**Settings:**
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- :attr:`mopidy.settings.MIXER_MAX_VOLUME`
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"""
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def __init__(self, backend, *args, **kwargs):
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self.backend = backend
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self.amplification_factor = settings.MIXER_MAX_VOLUME / 100.0
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@property
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def volume(self):
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"""
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The audio volume
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Integer in range [0, 100]. :class:`None` if unknown. Values below 0 is
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equal to 0. Values above 100 is equal to 100.
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"""
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if self._get_volume() is None:
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return None
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return int(self._get_volume() / self.amplification_factor)
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@volume.setter
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def volume(self, volume):
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volume = int(int(volume) * self.amplification_factor)
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if volume < 0:
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volume = 0
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elif volume > 100:
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volume = 100
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self._set_volume(volume)
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def destroy(self):
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pass
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def _get_volume(self):
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"""
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Return volume as integer in range [0, 100]. :class:`None` if unknown.
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*Must be implemented by subclass.*
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"""
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raise NotImplementedError
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def _set_volume(self, volume):
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"""
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Set volume as integer in range [0, 100].
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*Must be implemented by subclass.*
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"""
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raise NotImplementedError
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