'Refresh volume information.'

def _refresh_volume(self):

    volume_info = self._braviarc.get_volume_info()
    if (volume_info is not None):
        self._volume = volume_info.get('volume')
        self._min_volume = volume_info.get('minVolume')
        self._max_volume = volume_info.get('maxVolume')
        self._muted = volume_info.get('mute')
