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calculator.py
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# -*- coding: utf-8 -*-
# Copyright (C) 2005 Osmo Salomaa
#
# This program 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.
#
# This program 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 this program. If not, see <http://www.gnu.org/licenses/>.
"""Time and frame calculator."""
import aeidon
__all__ = ("Calculator",)
class Calculator:
"""
Time and frame calculator.
Times are handled as strings, frames as integers and seconds as floats.
Only one instance of :class:`Calculator` exists for a given framerate.
"""
_instances = {}
def __new__(cls, framerate=None):
"""
Return possibly existing instance for `framerate`.
`framerate` can be either an :attr:`aeidon.framerates` item
(preferred to be able to reuse instances) or an exact float value.
"""
if framerate is None:
framerate = aeidon.framerates.FPS_23_976
if not framerate in aeidon.framerates:
# Always return a new instance for float values.
return object.__new__(cls)
if not framerate in cls._instances:
cls._instances[framerate] = object.__new__(cls)
return cls._instances[framerate]
def __init__(self, framerate=None):
"""
Initialize a :class:`Calculator` instance.
`framerate` can be either an :attr:`aeidon.framerates` item
(preferred to be able to reuse instances) or an exact float value.
"""
if framerate is None:
framerate = aeidon.framerates.FPS_23_976
if framerate in aeidon.framerates:
self._framerate = framerate.value
else:
# Use non-constant values as is.
self._framerate = float(framerate)
def add(self, x, y):
"""Add position `y` to `x`."""
if aeidon.is_time(x):
x = self.to_seconds(x)
y = self.to_seconds(y)
return self.seconds_to_time(x + y)
if aeidon.is_frame(x):
return x + self.to_frame(y)
if aeidon.is_seconds(x):
return x + self.to_seconds(y)
raise ValueError("Invalid type for x: {!r}"
.format(type(x)))
def frame_to_seconds(self, frame):
"""Convert `frame` to seconds."""
return aeidon.as_seconds(frame / self._framerate)
def frame_to_time(self, frame):
"""Convert `frame` to time."""
seconds = self.frame_to_seconds(frame)
return self.seconds_to_time(seconds)
def get_middle(self, x, y):
"""Return time, frame or seconds halfway between `x` and `y`."""
if aeidon.is_time(x):
x = self.time_to_seconds(x)
y = self.to_seconds(y)
return self.seconds_to_time((x + y) / 2)
if aeidon.is_frame(x):
y = self.to_frame(y)
return aeidon.as_frame(round((x + y) / 2, 0))
if aeidon.is_seconds(x):
y = self.to_seconds(y)
return aeidon.as_seconds(((x + y) / 2))
raise ValueError("Invalid type for x: {!r}"
.format(type(x)))
def is_earlier(self, x, y):
"""Return ``True`` if `x` is earlier than `y`."""
if aeidon.is_time(x):
x = self.time_to_seconds(x)
return self.is_earlier(x, y)
if aeidon.is_frame(x):
return (x < self.to_frame(y))
if aeidon.is_seconds(x):
return (x < self.to_seconds(y))
raise ValueError("Invalid type for x: {!r}"
.format(type(x)))
def is_later(self, x, y):
"""Return ``True`` if `x` is later than `y`."""
if aeidon.is_time(x):
x = self.time_to_seconds(x)
return self.is_later(x, y)
if aeidon.is_frame(x):
return (x > self.to_frame(y))
if aeidon.is_seconds(x):
return (x > self.to_seconds(y))
raise ValueError("Invalid type for x: {!r}"
.format(type(x)))
def is_valid_time(self, time):
"""Return ``True`` if `time` is a valid time string."""
if time.startswith("-"):
time = time[1:]
try:
hours = int(time[ :2])
minutes = int(time[3:5])
seconds = int(time[6:8])
mseconds = int(time[9: ])
except ValueError:
return False
return (0 <= hours <= 99 and
0 <= minutes <= 59 and
0 <= seconds <= 59 and
0 <= mseconds <= 999)
def normalize_time(self, time):
"""
Convert `time` to valid format.
>>> calc = aeidon.Calculator()
>>> calc.normalize_time("1:2:3,4")
'01:02:03.400'
"""
time = time.strip()
sign = "-" if time.startswith("-") else ""
time = time.replace("-", "")
time = time.replace(",", ".")
if time.count(":") == 1:
# Allow hours to be missing,
# used at least in the WebVTT format.
time = "00:{}".format(time)
hours, minutes, seconds = time.split(":")
return ("{}{:02.0f}:{:02.0f}:{:02.0f}.{:03.0f}"
.format(sign,
int(hours),
int(minutes),
int(float(seconds)),
(float(seconds) % 1) * 1000))
def round(self, pos, ndigits):
"""
Round `pos` to given precision in decimal digits.
`ndigits` may be negative. For frames zero will be used
if given `ndigits` is greater than zero.
"""
if aeidon.is_time(pos):
pos = self.time_to_seconds(pos)
pos = round(pos, ndigits)
return self.seconds_to_time(pos)
if aeidon.is_frame(pos):
ndigits = min(0, ndigits)
pos = round(pos, ndigits)
return aeidon.as_frame(pos)
if aeidon.is_seconds(pos):
pos = round(pos, ndigits)
return aeidon.as_seconds(pos)
raise ValueError("Invalid type for pos: {!r}"
.format(type(pos)))
def seconds_to_frame(self, seconds):
"""Convert `seconds` to frame."""
return int(round(seconds * self._framerate, 0))
def seconds_to_time(self, seconds):
"""Convert `seconds` to time."""
sign = "-" if seconds < 0 else ""
seconds = abs(round(seconds, 3))
if seconds > 359999.999:
return "{}99:59:59.999".format(sign)
return ("{}{:02.0f}:{:02.0f}:{:02.0f}.{:03.0f}"
.format(sign,
seconds // 3600,
(seconds % 3600) // 60,
int(seconds % 60),
(seconds % 1) * 1000))
def time_to_frame(self, time):
"""Convert `time` to frame."""
seconds = self.time_to_seconds(time)
return self.seconds_to_frame(seconds)
def time_to_seconds(self, time):
"""Convert `time` to seconds."""
coefficient = -1 if time.startswith("-") else 1
time = time[1:] if time.startswith("-") else time
return coefficient * sum((float(time[ :2]) * 3600,
float(time[3:5]) * 60,
float(time[6:8]),
float(time[9: ]) / 1000))
def to_frame(self, pos):
"""Convert `pos` to frame."""
if aeidon.is_time(pos):
return self.time_to_frame(pos)
if aeidon.is_frame(pos):
return pos
if aeidon.is_seconds(pos):
return self.seconds_to_frame(pos)
raise ValueError("Invalid type for pos: {!r}"
.format(type(pos)))
def to_seconds(self, pos):
"""Convert `pos` to seconds."""
if aeidon.is_time(pos):
return self.time_to_seconds(pos)
if aeidon.is_frame(pos):
return self.frame_to_seconds(pos)
if aeidon.is_seconds(pos):
return pos
raise ValueError("Invalid type for pos: {!r}"
.format(type(pos)))
def to_time(self, pos):
"""Convert `pos` to time."""
if aeidon.is_time(pos):
return pos
if aeidon.is_frame(pos):
return self.frame_to_time(pos)
if aeidon.is_seconds(pos):
return self.seconds_to_time(pos)
raise ValueError("Invalid type for pos: {!r}"
.format(type(pos)))