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58 lines
1.4 KiB
58 lines
1.4 KiB
5 years ago
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# -*- coding: utf-8 -*-
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from __future__ import unicode_literals
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from logging import NullHandler, getLogger
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from six import text_type
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from ...rule import Rule
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logger = getLogger(__name__)
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logger.addHandler(NullHandler())
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class AudioChannelsRule(Rule):
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"""Audio Channel rule."""
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mapping = {
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1: '1.0',
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2: '2.0',
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6: '5.1',
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8: '7.1',
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}
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def execute(self, props, pv_props, context):
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"""Execute the rule against properties."""
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count = props.get('channels_count')
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if count is None:
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return
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channels = self.mapping.get(count) if isinstance(count, int) else None
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positions = pv_props.get('channel_positions') or []
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positions = positions if isinstance(positions, list) else [positions]
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candidate = 0
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for position in positions:
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if not position:
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continue
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c = 0
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for i in position.split('/'):
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try:
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c += float(i)
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except ValueError:
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logger.debug('Invalid %s: %s', self.description, i)
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pass
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c_count = int(c) + int(round((c - int(c)) * 10))
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if c_count == count:
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return text_type(c)
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candidate = max(candidate, c)
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if channels:
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return channels
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if candidate:
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return text_type(candidate)
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self.report(positions, context)
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