2 Copyright (C) 2012-2016 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 #include "frame_rate_change.h"
25 #include "compose.hpp"
31 using boost::shared_ptr;
34 about_equal (double a, double b)
36 return (fabs (a - b) < VIDEO_FRAME_RATE_EPSILON);
39 FrameRateChange::FrameRateChange ()
44 , change_speed (false)
50 FrameRateChange::FrameRateChange (double source_, int dcp_)
53 , change_speed (false)
55 construct (source_, dcp_);
59 FrameRateChange::construct (double source_, int dcp_)
64 if (fabs (source / 2.0 - dcp) < fabs (source - dcp)) {
65 /* The difference between source and DCP frame rate will be lower
66 (i.e. better) if we skip.
69 } else if (fabs (source * 2 - dcp) < fabs (source - dcp)) {
70 /* The difference between source and DCP frame rate would be better
71 if we repeated each frame once; it may be better still if we
72 repeated more than once. Work out the required repeat.
74 repeat = round (dcp / source);
77 speed_up = dcp / (source * factor());
78 change_speed = !about_equal (speed_up, 1.0);
81 FrameRateChange::FrameRateChange (shared_ptr<const Film> film, shared_ptr<const Content> content)
85 construct (content->active_video_frame_rate(film), film->video_frame_rate());
88 FrameRateChange::FrameRateChange (shared_ptr<const Film> film, Content const * content)
92 construct (content->active_video_frame_rate(film), film->video_frame_rate());
96 FrameRateChange::description () const
100 if (!skip && repeat == 1 && !change_speed) {
101 description = _("Content and DCP have the same rate.\n");
104 description = _("DCP will use every other frame of the content.\n");
105 } else if (repeat == 2) {
106 description = _("Each content frame will be doubled in the DCP.\n");
107 } else if (repeat > 2) {
108 description = String::compose (_("Each content frame will be repeated %1 more times in the DCP.\n"), repeat - 1);
112 double const pc = dcp * 100 / (source * factor());
114 snprintf (buffer, sizeof(buffer), _("DCP will run at %.1f%% of the content speed.\n"), pc);
115 description += buffer;