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/*
Copyright (C) 2014-2015 Carl Hetherington <cth@carlh.net>
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 2 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, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include "sub_time.h"
#include "sub_assert.h"
#include "exceptions.h"
#include <cmath>
#include <iomanip>
#include <iostream>
using std::ostream;
using std::cout;
using std::setw;
using std::setfill;
using boost::optional;
using namespace sub;
bool
sub::operator< (sub::Time const & a, sub::Time const & b)
{
if (a._seconds != b._seconds) {
return a._seconds < b._seconds;
}
if (!a._rate && !b._rate) {
/* Can compare if neither has a specified frame rate */
return a._frames < b._frames;
}
if ((a._rate && !b._rate) || (!a._rate && b._rate)) {
throw UnknownFrameRateError ();
}
return (a._frames * a._rate.get().numerator * b._rate.get().denominator) < (b._frames * b._rate.get().numerator * a._rate.get().denominator);
}
bool
sub::operator> (sub::Time const & a, sub::Time const & b)
{
if (a._seconds != b._seconds) {
return a._seconds > b._seconds;
}
if (!a._rate && !b._rate) {
/* Can compare if neither has a specified frame rate */
return a._frames > b._frames;
}
if ((a._rate && !b._rate) || (!a._rate && b._rate)) {
throw UnknownFrameRateError ();
}
return (a._frames * a._rate.get().numerator * b._rate.get().denominator) > (b._frames * b._rate.get().numerator * a._rate.get().denominator);
}
bool
sub::operator== (sub::Time const & a, sub::Time const & b)
{
if (!a._rate && !b._rate) {
/* Can compare if neither has a specified frame rate */
return (a._seconds == b._seconds && a._frames == b._frames);
}
if ((a._rate && !b._rate) || (!a._rate && b._rate)) {
throw UnknownFrameRateError ();
}
if (a._seconds != b._seconds) {
return false;
}
return (a._frames * a._rate.get().numerator * b._rate.get().denominator) == (b._frames * b._rate.get().numerator * a._rate.get().denominator);
}
bool
sub::operator!= (sub::Time const & a, sub::Time const & b)
{
return !(a == b);
}
ostream&
sub::operator<< (ostream& s, Time const & t)
{
s << setw (2) << setfill('0') << t.hours() << ":"
<< setw (2) << setfill('0') << t.minutes() << ":"
<< setw (2) << setfill('0') << t.seconds() << ":"
<< t._frames;
if (t._rate) {
s << " @ " << t._rate.get().numerator << "/" << t._rate.get().denominator;
}
return s;
}
int
Time::hours () const
{
return _seconds / 3600;
}
int
Time::minutes () const
{
return (_seconds - hours() * 3600) / 60;
}
int
Time::seconds () const
{
return (_seconds - hours() * 3600 - minutes() * 60);
}
int
Time::frames_at (Rational rate) const
{
if (!_rate) {
throw UnknownFrameRateError ();
}
return rint (double (_frames) * _rate.get().denominator * rate.numerator / (_rate.get().numerator * rate.denominator));
}
int
Time::milliseconds () const
{
return frames_at (Rational (1000, 1));
}
Time
Time::from_hmsf (int h, int m, int s, int f, optional<Rational> rate)
{
return Time (h * 3600 + m * 60 + s, f, rate);
}
Time
Time::from_hms (int h, int m, int s, int ms)
{
return Time (h * 3600 + m * 60 + s, ms, Rational (1000, 1));
}
/** Create a Time from a number of frames.
* rate must be integer.
*/
Time
Time::from_frames (int f, Rational rate)
{
SUB_ASSERT (rate.denominator != 0);
SUB_ASSERT (rate.integer ());
return Time (f / rate.integer_fraction(), f % rate.integer_fraction(), rate);
}
double
Time::all_as_seconds () const
{
return _seconds + double(milliseconds()) / 1000;
}
/** Add a time to this one. Both *this and t must have a specified _rate */
void
Time::add (Time t)
{
SUB_ASSERT (_rate);
SUB_ASSERT (t._rate);
Rational result_rate = max (*_rate, *t._rate);
*this = Time::from_frames((all_as_seconds() + t.all_as_seconds()) * result_rate.fraction(), result_rate);
}
void
Time::scale (float f)
{
SUB_ASSERT (_rate);
SUB_ASSERT (_rate->denominator != 0);
SUB_ASSERT (_rate->integer ());
double const s = Time::all_as_seconds() * f;
_seconds = floor (s);
_frames = rint ((s - _seconds) * _rate->fraction());
}
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