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106 lines
3.1 KiB
106 lines
3.1 KiB
3 years ago
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#!/usr/bin/env python
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"""Perform linear time correction on a subtitle."""
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from __future__ import division
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import srt
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import datetime
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import srt_tools.utils
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import logging
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log = logging.getLogger(__name__)
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def timedelta_to_milliseconds(delta):
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return delta.days * 86400000 + delta.seconds * 1000 + delta.microseconds / 1000
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def parse_args():
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def srt_timestamp_to_milliseconds(parser, arg):
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try:
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delta = srt.srt_timestamp_to_timedelta(arg)
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except ValueError:
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parser.error("not a valid SRT timestamp: %s" % arg)
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else:
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return timedelta_to_milliseconds(delta)
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examples = {
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"Stretch out a subtitle so that second 1 is 2, 2 is 4, etc": "srt linear-timeshift --f1 00:00:01,000 --t1 00:00:01,000 --f2 00:00:02,000 --t2 00:00:03,000"
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}
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parser = srt_tools.utils.basic_parser(description=__doc__, examples=examples)
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parser.add_argument(
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"--from-start",
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"--f1",
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type=lambda arg: srt_timestamp_to_milliseconds(parser, arg),
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required=True,
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help="the first desynchronised timestamp",
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)
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parser.add_argument(
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"--to-start",
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"--t1",
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type=lambda arg: srt_timestamp_to_milliseconds(parser, arg),
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required=True,
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help="the first synchronised timestamp",
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)
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parser.add_argument(
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"--from-end",
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"--f2",
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type=lambda arg: srt_timestamp_to_milliseconds(parser, arg),
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required=True,
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help="the second desynchronised timestamp",
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)
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parser.add_argument(
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"--to-end",
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"--t2",
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type=lambda arg: srt_timestamp_to_milliseconds(parser, arg),
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required=True,
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help="the second synchronised timestamp",
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)
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return parser.parse_args()
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def calc_correction(to_start, to_end, from_start, from_end):
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angular = (to_end - to_start) / (from_end - from_start)
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linear = to_end - angular * from_end
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return angular, linear
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def correct_time(current_msecs, angular, linear):
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return round(current_msecs * angular + linear)
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def correct_timedelta(bad_delta, angular, linear):
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bad_msecs = timedelta_to_milliseconds(bad_delta)
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good_msecs = correct_time(bad_msecs, angular, linear)
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good_delta = datetime.timedelta(milliseconds=good_msecs)
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return good_delta
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def linear_correct_subs(subtitles, angular, linear):
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for subtitle in subtitles:
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subtitle.start = correct_timedelta(subtitle.start, angular, linear)
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subtitle.end = correct_timedelta(subtitle.end, angular, linear)
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yield subtitle
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def main():
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args = parse_args()
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logging.basicConfig(level=args.log_level)
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angular, linear = calc_correction(
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args.to_start, args.to_end, args.from_start, args.from_end
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)
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srt_tools.utils.set_basic_args(args)
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corrected_subs = linear_correct_subs(args.input, angular, linear)
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output = srt_tools.utils.compose_suggest_on_fail(corrected_subs, strict=args.strict)
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try:
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args.output.write(output)
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except (UnicodeEncodeError, TypeError): # Python 2 fallback
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args.output.write(output.encode(args.encoding))
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if __name__ == "__main__": # pragma: no cover
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main()
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