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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 "content.h"
#include "film.h"
#include "frame_rate_change.h"
#include <cmath>
#include "i18n.h"
using std::shared_ptr;
using std::string;
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 = round(source / dcp) - 1;
} 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 == 0 && _repeat == 1 && !_change_speed) {
description = _("Content and DCP have the same rate.\n");
} else {
if (_skip == 1) {
description = _("DCP will use every other frame of the content.\n");
} else if (_skip >= 2) {
description = fmt::format(_("DCP will contain 1 out of every {} frames of the content.\n"), _skip + 1);
} else if (_repeat == 2) {
description = _("Each content frame will be doubled in the DCP.\n");
} else if (_repeat > 2) {
description = fmt::format(_("Each content frame will be repeated {} 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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