2 Copyright (C) 2012-2021 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/>.
22 #include "compose.hpp"
25 #include "frame_rate_change.h"
31 using std::shared_ptr;
35 FrameRateChange::FrameRateChange ()
41 FrameRateChange::FrameRateChange (double source_, int dcp_)
46 if (fabs(source / 2.0 - dcp) < fabs(source - dcp)) {
47 /* The difference between source and DCP frame rate will be lower
48 (i.e. better) if we skip.
51 } else if (fabs(source * 2 - dcp) < fabs(source - dcp)) {
52 /* The difference between source and DCP frame rate would be better
53 if we repeated each frame once; it may be better still if we
54 repeated more than once. Work out the required repeat.
56 repeat = round (dcp / source);
59 speed_up = dcp / (source * factor());
61 auto about_equal = [](double a, double b) {
62 return (fabs (a - b) < VIDEO_FRAME_RATE_EPSILON);
65 change_speed = !about_equal (speed_up, 1.0);
69 FrameRateChange::FrameRateChange (shared_ptr<const Film> film, shared_ptr<const Content> content)
70 : FrameRateChange (content->active_video_frame_rate(film), film->video_frame_rate())
76 FrameRateChange::FrameRateChange (shared_ptr<const Film> film, Content const * content)
77 : FrameRateChange (content->active_video_frame_rate(film), film->video_frame_rate())
84 FrameRateChange::description () const
88 if (!skip && repeat == 1 && !change_speed) {
89 description = _("Content and DCP have the same rate.\n");
92 description = _("DCP will use every other frame of the content.\n");
93 } else if (repeat == 2) {
94 description = _("Each content frame will be doubled in the DCP.\n");
95 } else if (repeat > 2) {
96 description = String::compose (_("Each content frame will be repeated %1 more times in the DCP.\n"), repeat - 1);
100 double const pc = dcp * 100 / (source * factor());
102 snprintf (buffer, sizeof(buffer), _("DCP will run at %.1f%% of the content speed.\n"), pc);
103 description += buffer;