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76 lines
2.4 KiB
76 lines
2.4 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 ...rule import Rule
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class ResolutionRule(Rule):
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"""Resolution rule."""
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standard_resolutions = (
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480,
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720,
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1080,
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2160,
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4320,
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)
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uncommon_resolutions = (
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240,
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288,
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360,
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576,
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)
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resolutions = list(sorted(standard_resolutions + uncommon_resolutions))
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square = 4. / 3
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wide = 16. / 9
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def execute(self, props, pv_props, context):
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"""Return the resolution for the video.
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The resolution is based on a widescreen TV (16:9)
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1920x800 will be considered 1080p since the TV will use 1920x1080 with vertical black bars
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1426x1080 is considered 1080p since the TV will use 1920x1080 with horizontal black bars
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The calculation considers the display aspect ratio and the pixel aspect ratio (not only width and height).
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The upper resolution is selected if there's no perfect match with the following list of resolutions:
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240, 288, 360, 480, 576, 720, 1080, 2160, 4320
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If no interlaced information is available, resolution will be considered Progressive.
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"""
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width = props.get('width')
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height = props.get('height')
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if not width or not height:
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return
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try:
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width = width.magnitude
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height = height.magnitude
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except AttributeError:
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pass
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dar = props.get('aspect_ratio', float(width) / height)
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par = props.get('pixel_aspect_ratio', 1)
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scan_type = props.get('scan_type', 'p')[0].lower()
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# selected DAR must be between 4:3 and 16:9
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selected_dar = max(min(dar, self.wide), self.square)
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# mod-16
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stretched_width = int(round(width * par / 16)) * 16
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# mod-8
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calculated_height = int(round(stretched_width / selected_dar / 8)) * 8
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selected_resolution = None
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for r in reversed(self.resolutions):
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if r < calculated_height:
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break
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selected_resolution = r
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if selected_resolution:
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return '{0}{1}'.format(selected_resolution, scan_type)
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msg = '{width}x{height} - scan_type: {scan_type}, aspect_ratio: {dar}, pixel_aspect_ratio: {par}'.format(
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width=width, height=height, scan_type=scan_type, dar=dar, par=par)
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self.report(msg, context)
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