/usr/lib/python3/dist-packages/aeidon/agents/position.py is in python3-aeidon 0.24.3-1.
This file is owned by root:root, with mode 0o644.
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# Copyright (C) 2005-2007,2009 Osmo Salomaa
#
# This file is part of Gaupol.
#
# Gaupol is free software: you can redistribute it and/or modify it under the
# terms of the GNU General Public License as published by the Free Software
# Foundation, either version 3 of the License, or (at your option) any later
# version.
#
# Gaupol is distributed in the hope that it will be useful, but WITHOUT ANY
# WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
# A PARTICULAR PURPOSE. See the GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License along with
# Gaupol. If not, see <http://www.gnu.org/licenses/>.
"""Manipulating times and frames."""
import aeidon
_ = aeidon.i18n._
class PositionAgent(aeidon.Delegate, metaclass=aeidon.Contractual):
"""Manipulating times and frames."""
def _get_frame_transform_ensure(self, value, p1, p2):
assert aeidon.is_frame(value[1])
def _get_frame_transform(self, p1, p2):
"""
Return a formula for linear transformation of positions.
Return coefficient and constant, with which all subtitles
should be scaled and shifted by to apply correction.
"""
# Think of this as a linear transformation where input positions
# are located on the x-axis and output positions on the y-axis.
x1 = self.subtitles[p1[0]].start_frame
x2 = self.subtitles[p2[0]].start_frame
y1 = p1[1]
y2 = p2[1]
coefficient = (y2 - y1) / (x2 - x1)
constant = int(round(-coefficient * x1 + y1, 0))
return coefficient, constant
def _get_seconds_transform_ensure(self, value, p1, p2):
assert aeidon.is_seconds(value[1])
def _get_seconds_transform(self, p1, p2):
"""
Return a formula for linear transformation of positions.
Return coefficient and constant, with which all subtitles should be
scaled and shifted by to apply correction.
"""
# Think of this as a linear transformation where input positions
# are located on the x-axis and output positions on the y-axis.
x1 = self.subtitles[p1[0]].start_seconds
x2 = self.subtitles[p2[0]].start_seconds
y1 = p1[1]
y2 = p2[1]
coefficient = (y2 - y1) / (x2 - x1)
constant = -coefficient * x1 + y1
return coefficient, constant
def _get_time_transform(self, p1, p2):
"""
Return a formula for linear correction of positions.
Return coefficient and constant, with which all subtitles should be
scaled and shifted by to apply correction.
"""
p1 = [p1[0], self.calc.time_to_seconds(p1[1])]
p2 = [p2[0], self.calc.time_to_seconds(p2[1])]
return self._get_seconds_transform(p1, p2)
def adjust_durations_require(self, indices=None, *args, **kwargs):
for index in indices or ():
assert 0 <= index < len(self.subtitles)
@aeidon.deco.export
@aeidon.deco.revertable
def adjust_durations(self,
indices=None,
speed=None,
lengthen=False,
shorten=False,
minimum=None,
maximum=None,
gap=None,
register=-1):
"""
Lengthen or shorten durations by changing end positions.
`indices` can be ``None`` to process all subtitles. `speed` is reading
speed in characters per second. `lengthen` is ``True`` to increase
durations to match reading speed. `shorten` is ``True`` to decrease
durations to match reading speed. `maximum` is the greatest allowed
duration in seconds. `minimum` is the smallest allowed duration in
seconds. `gap` is seconds to be left between consecutive subtitles.
Using a gap of at least zero is always a good idea if dealing with
a case or format where overlapping is not desirable.
Return changed indices.
"""
new_indices = []
new_subtitles = []
for index in indices or self.get_all_indices():
start = self.subtitles[index].start_seconds
end = self.subtitles[index].end_seconds
end_max = (self.subtitles[index + 1].start_seconds
if index < len(self.subtitles) - 1
else 360000)
if speed is not None:
length = self.get_text_length(index, aeidon.documents.MAIN)
optimal_duration = length / float(speed)
if lengthen:
if end - start < optimal_duration:
end = start + optimal_duration
if shorten:
if end - start > optimal_duration:
end = start + optimal_duration
if minimum is not None:
if end - start < minimum:
end = start + minimum
if maximum is not None:
if end - start > maximum:
end = start + maximum
if gap is not None:
if end_max - end < gap:
end = max(start, end_max - gap)
if end != self.subtitles[index].end_seconds:
new_indices.append(index)
subtitle = self.subtitles[index].copy()
subtitle.end_seconds = end
new_subtitles.append(subtitle)
if not new_indices:
return new_indices
self.replace_positions(new_indices, new_subtitles, register=register)
self.set_action_description(register, _("Adjusting durations"))
return new_indices
def convert_framerate_require(self, indices, *args, **kwargs):
for index in indices or ():
assert 0 <= index < len(self.subtitles)
@aeidon.deco.export
@aeidon.deco.revertable
def convert_framerate(self,
indices,
framerate_in,
framerate_out,
register=-1):
"""
Set the value of framerate and convert subtitles to it.
`indices` can be ``None`` to process all subtitles.
"""
self.set_framerate(framerate_in, register=None)
new_subtitles = []
indices = indices or self.get_all_indices()
for index in indices:
subtitle = self.subtitles[index].copy()
subtitle.convert_framerate(framerate_out)
new_subtitles.append(subtitle)
self.set_framerate(framerate_out)
self.replace_positions(indices, new_subtitles, register=register)
self.group_actions(register, 2, _("Converting framerate"))
@aeidon.deco.export
@aeidon.deco.revertable
def set_framerate(self, framerate, register=-1):
"""Set the value of framerate."""
orig_framerate = self.framerate
self.framerate = framerate
self.calc = aeidon.Calculator(framerate)
for subtitle in self.subtitles:
subtitle.framerate = framerate
action = self.new_revertable_action(register)
action.docs = tuple(aeidon.documents)
action.description = _("Setting framerate")
action.revert_function = self.set_framerate
action.revert_args = (orig_framerate,)
self.register_action(action)
def shift_positions_require(self, indices, count, register=-1):
for index in indices or ():
assert 0 <= index < len(self.subtitles)
@aeidon.deco.export
@aeidon.deco.revertable
def shift_positions(self, indices, value, register=-1):
"""
Make subtitles appear earlier or later.
`indices` can be ``None`` to process all subtitles.
"""
new_subtitles = []
indices = indices or self.get_all_indices()
for index in indices:
subtitle = self.subtitles[index].copy()
subtitle.shift_positions(value)
new_subtitles.append(subtitle)
self.replace_positions(indices, new_subtitles, register=register)
self.set_action_description(register, _("Shifting positions"))
def transform_positions_require(self, indices, *args, **kwargs):
for index in indices or ():
assert 0 <= index < len(self.subtitles)
@aeidon.deco.export
@aeidon.deco.revertable
def transform_positions(self, indices, p1, p2, register=-1):
"""
Change positions by a linear two-point correction.
`indices` can be ``None`` to process all subtitles. `p1` and `p2`
should be tuples of index, position.
"""
if aeidon.is_time(p1[1]):
method = self._get_time_transform
if aeidon.is_frame(p1[1]):
method = self._get_frame_transform
if aeidon.is_seconds(p1[1]):
method = self._get_seconds_transform
coefficient, constant = method(p1, p2)
new_subtitles = []
indices = indices or self.get_all_indices()
for index in indices:
subtitle = self.subtitles[index].copy()
subtitle.scale_positions(coefficient)
subtitle.shift_positions(constant)
new_subtitles.append(subtitle)
self.replace_positions(indices, new_subtitles, register=register)
self.set_action_description(register, _("Transforming positions"))
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