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/*
Copyright (C) 2012-2015 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.
*/
#ifndef DCPOMATIC_FRAME_RATE_CHANGE_H
#define DCPOMATIC_FRAME_RATE_CHANGE_H
#include <string>
struct FrameRateChange
{
FrameRateChange (double, int);
/** @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) {
return 0.5;
}
return repeat;
}
double source;
int dcp;
/** true to skip every other frame */
bool skip;
/** number of times to use each frame (e.g. 1 is normal, 2 means repeat each frame once, and so on) */
int repeat;
/** 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;
/** 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;
std::string description () const;
};
#endif
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