2 Copyright (C) 2012-2015 Carl Hetherington <cth@carlh.net>
4 This file is part of DCP-o-matic.
6 DCP-o-matic is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2 of the License, or
9 (at your option) any later version.
11 DCP-o-matic is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with DCP-o-matic. If not, see <http://www.gnu.org/licenses/>.
21 #ifndef DCPOMATIC_FRAME_RATE_CHANGE_H
22 #define DCPOMATIC_FRAME_RATE_CHANGE_H
26 struct FrameRateChange
28 FrameRateChange (double, int);
30 /** @return factor by which to multiply a source frame rate
31 to get the effective rate after any skip or repeat has happened.
33 double factor () const {
44 /** true to skip every other frame */
46 /** number of times to use each frame (e.g. 1 is normal, 2 means repeat each frame once, and so on) */
48 /** true if this DCP will run its video faster or slower than the source
49 * without taking into account `repeat' nor `skip'.
50 * (e.g. change_speed will be true if
51 * source is 29.97fps, DCP is 30fps
52 * source is 14.50fps, DCP is 30fps
54 * source is 15.00fps, DCP is 30fps
55 * source is 12.50fps, DCP is 25fps)
59 /** Amount by which the video is being sped-up in the DCP; e.g. for a
60 * 24fps source in a 25fps DCP this would be 25/24.
64 std::string description () const;