audio: Use None instead of -1 for undefined volume
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@ -43,7 +43,7 @@ class Audio(pykka.ThreadingActor):
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self._mixer_track = None
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self._software_mixing = False
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self._appsrc = None
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self._volume_set = -1
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self._volume_set = None
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self._notify_source_signal_id = None
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self._about_to_finish_id = None
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@ -396,7 +396,7 @@ class Audio(pykka.ThreadingActor):
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volume_set_scaled = self._rescale(
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self._volume_set, old=internal_scale, new=mixer_scale)
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if self._volume_set > 0 and volume_set_scaled == avg_volume:
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if self._volume_set is not None and volume_set_scaled == avg_volume:
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return self._volume_set
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else:
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return self._rescale(
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