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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/>.
*/
#include "frame_rate_change.h"
#include "types.h"
#include "content.h"
#include "film.h"
#include <dcp/compose.h>
#include <cmath>
#include "i18n.h"
using std::string;
using std::shared_ptr;
FrameRateChange::FrameRateChange ()
{
}
FrameRateChange::FrameRateChange (double source_, int dcp_)
{
source = source_;
dcp = dcp_;
if (fabs(source / 2.0 - dcp) < fabs(source - dcp)) {
/* The difference between source and DCP frame rate will be lower
(i.e. better) if we skip.
*/
skip = true;
} else if (fabs(source * 2 - dcp) < fabs(source - dcp)) {
/* The difference between source and DCP frame rate would be better
if we repeated each frame once; it may be better still if we
repeated more than once. Work out the required repeat.
*/
repeat = round (dcp / source);
}
speed_up = dcp / (source * factor());
auto about_equal = [](double a, double b) {
return (fabs (a - b) < VIDEO_FRAME_RATE_EPSILON);
};
change_speed = !about_equal (speed_up, 1.0);
}
FrameRateChange::FrameRateChange (shared_ptr<const Film> film, shared_ptr<const Content> content)
: FrameRateChange (content->active_video_frame_rate(film), film->video_frame_rate())
{
}
FrameRateChange::FrameRateChange (shared_ptr<const Film> film, Content const * content)
: FrameRateChange (content->active_video_frame_rate(film), film->video_frame_rate())
{
}
string
FrameRateChange::description () const
{
string description;
if (!skip && repeat == 1 && !change_speed) {
description = _("Content and DCP have the same rate.\n");
} else {
if (skip) {
description = _("DCP will use every other frame of the content.\n");
} else if (repeat == 2) {
description = _("Each content frame will be doubled in the DCP.\n");
} else if (repeat > 2) {
description = dcp::compose (_("Each content frame will be repeated %1 more times in the DCP.\n"), repeat - 1);
}
if (change_speed) {
double const pc = dcp * 100 / (source * factor());
char buffer[256];
snprintf (buffer, sizeof(buffer), _("DCP will run at %.1f%% of the content speed.\n"), pc);
description += buffer;
}
}
return description;
}
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