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/*
Copyright (C) 2012-2021 Carl Hetherington <cth@carlh.net>
This file is part of DCP-o-matic.
DCP-o-matic 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.
DCP-o-matic 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 DCP-o-matic. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef DCPOMATIC_FRAME_RATE_CHANGE_H
#define DCPOMATIC_FRAME_RATE_CHANGE_H
#include <memory>
#include <string>
class Content;
class Film;
class FrameRateChange
{
public:
FrameRateChange();
FrameRateChange(double, int);
FrameRateChange(std::shared_ptr<const Film> film, std::shared_ptr<const Content> content);
FrameRateChange(std::shared_ptr<const Film> film, Content const * content);
/** @return factor by which to multiply a source frame rate
to get the effective rate after any skip or repeat has happened.
*/
double factor() const {
if (_skip > 0) {
return 1.0 / (_skip + 1);
}
return _repeat;
}
std::string description() const;
int skip() const {
return _skip;
}
int repeat() const {
return _repeat;
}
double speed_up() const {
return _speed_up;
}
bool change_speed() const {
return _change_speed;
}
double source() const {
return _source;
}
int dcp() const {
return _dcp;
}
private:
double _source = 24;
int _dcp = 24;
/** Frames to skip between each one to use, e.g.
* 0 to skip no frames, 1 to skip every other one, 2 to skip 2 out of 3, etc.
*/
int _skip = 0;
/** number of times to use each frame (e.g. 1 is normal, 2 means repeat each frame once, and so on) */
int _repeat = 1;
/** true if this DCP will run its video faster or slower than the source
* without taking into account `repeat' nor `skip'.
* (e.g. change_speed will be true if
* source is 29.97fps, DCP is 30fps
* source is 14.50fps, DCP is 30fps
* but not if
* source is 15.00fps, DCP is 30fps
* source is 12.50fps, DCP is 25fps)
*/
bool _change_speed = false;
/** Amount by which the video is being sped-up in the DCP; e.g. for a
* 24fps source in a 25fps DCP this would be 25/24.
*/
double _speed_up = 1.0;
};
#endif
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