public static readonly Rational NtscFilm = _23_97Hz; // 24000/1001
public static Rational Parse(string text)
{
if (text.IndexOf('/') > 0)
{
return(Rational.Parse(text));
}
// Aliases
switch (text)
{
case "23.97": return(_23_97Hz);
case "29.97": return(_29_97Hz);
case "59.94": return(_59_94Hz);
case "119.88": return(_119_88Hz);
case "atsc": return(Atsc);
case "film": return(Film);
case "qpal": return(Pal);
case "pal": return(Pal);
case "ntsc": return(Ntsc);
case "ntsc-film": return(NtscFilm);
}
// e.g. 30fps
if (text.EndsWith("fps") && int.TryParse(text.Substring(0, text.Length - 3), out int fps))
{
return(new Rational(fps, 1));
}
// e.g. 30
else if (int.TryParse(text.Substring(0, text.Length - 3), out fps))
{
return(new Rational(fps, 1));
}
throw new Exception("unknown frame rate:" + text);
}
public static TimeBase Parse(string text)
{
var rational = Rational.Parse(text);
return(new TimeBase(rational.Numerator, rational.Denominator));
}