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#!/usr/bin/env python
"""Perform linear time correction on a subtitle."""
from __future__ import division
import srt
import datetime
import srt_tools.utils
import logging
log = logging.getLogger(__name__)
def timedelta_to_milliseconds(delta):
return delta.days * 86400000 + delta.seconds * 1000 + delta.microseconds / 1000
def parse_args():
def srt_timestamp_to_milliseconds(parser, arg):
try:
delta = srt.srt_timestamp_to_timedelta(arg)
except ValueError:
parser.error("not a valid SRT timestamp: %s" % arg)
else:
return timedelta_to_milliseconds(delta)
examples = {
"Stretch out a subtitle so that second 1 is 1, 2 is 3, 3 is 5, etc": "srt linear-timeshift --f1 00:00:01,000 --t1 00:00:01,000 --f2 00:00:02,000 --t2 00:00:03,000"
}
parser = srt_tools.utils.basic_parser(description=__doc__, examples=examples)
parser.add_argument(
"--from-start",
"--f1",
type=lambda arg: srt_timestamp_to_milliseconds(parser, arg),
required=True,
help="the first desynchronised timestamp",
)
parser.add_argument(
"--to-start",
"--t1",
type=lambda arg: srt_timestamp_to_milliseconds(parser, arg),
required=True,
help="the first synchronised timestamp",
)
parser.add_argument(
"--from-end",
"--f2",
type=lambda arg: srt_timestamp_to_milliseconds(parser, arg),
required=True,
help="the second desynchronised timestamp",
)
parser.add_argument(
"--to-end",
"--t2",
type=lambda arg: srt_timestamp_to_milliseconds(parser, arg),
required=True,
help="the second synchronised timestamp",
)
return parser.parse_args()
def calc_correction(to_start, to_end, from_start, from_end):
angular = (to_end - to_start) / (from_end - from_start)
linear = to_end - angular * from_end
return angular, linear
def correct_time(current_msecs, angular, linear):
return round(current_msecs * angular + linear)
def correct_timedelta(bad_delta, angular, linear):
bad_msecs = timedelta_to_milliseconds(bad_delta)
good_msecs = correct_time(bad_msecs, angular, linear)
good_delta = datetime.timedelta(milliseconds=good_msecs)
return good_delta
def linear_correct_subs(subtitles, angular, linear):
for subtitle in subtitles:
subtitle.start = correct_timedelta(subtitle.start, angular, linear)
subtitle.end = correct_timedelta(subtitle.end, angular, linear)
yield subtitle
def main():
args = parse_args()
logging.basicConfig(level=args.log_level)
angular, linear = calc_correction(
args.to_start, args.to_end, args.from_start, args.from_end
)
srt_tools.utils.set_basic_args(args)
corrected_subs = linear_correct_subs(args.input, angular, linear)
output = srt_tools.utils.compose_suggest_on_fail(corrected_subs, strict=args.strict)
try:
args.output.write(output)
except (UnicodeEncodeError, TypeError): # Python 2 fallback
args.output.write(output.encode(args.encoding))
if __name__ == "__main__": # pragma: no cover
main()
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