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/*
Copyright (C) 2014 Carl Hetherington <cth@carlh.net>
This program 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.
This program 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 this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include "stl_util.h"
#include "exceptions.h"
#include "compose.hpp"
#include <string>
#include <cmath>
using std::string;
using namespace sub;
bool
about_equal (float a, float b)
{
return fabs (a - b) < 1e-4;
}
string
sub::stl_frame_rate_to_dfc (float r)
{
/* This is the FAB Subtitler mapping, as used by Annotation Edit */
if (about_equal (r, 23.976)) {
return "STL24.01";
} else if (about_equal (r, 24)) {
return "STL23.01";
} else if (about_equal (r, 25)) {
return "STL25.01";
} else if (about_equal (r, 30)) {
return "STL30.01";
}
return "STL25.01";
}
float
sub::stl_dfc_to_frame_rate (string s)
{
if (s == "STL24.01") {
return 23.976;
} else if (s == "STL23.01") {
return 24;
} else if (s == "STL25.01") {
return 25;
} else if (s == "STL30.01") {
return 30;
}
throw STLError (String::compose ("Unknown disk format code %1 in binary STL file", s));
}
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