protected override string CollectArgument(IProperty property)
{
switch (property.Name)
{
case "seek":
return(PreviewMode || !Seek.IsValid() ? null : string.Format((string)property.Value, Seek.TotalSeconds));
case "filter":
int w, h;
string select;
string scale;
string tile;
if (PreviewMode)
{
w = -1;
h = Height.NotBelow(-1);
select = ",select=key";
tile = ",tile=100x1";
}
else
{
w = Width.NotBelow(-1);
h = Height.NotBelow(-1);
float scene = SceneFilter.Within(-1.0f, 1.0f);
select = scene <= 0.00f ? string.Empty : $",select=gt(scene\\,{scene:F2})";
tile = string.Empty;
}
if (w <= 0)
{
w = -1;
}
if (h <= 0)
{
h = -1;
}
scale = w > 0 || h > 0 ? $",scale={w}:{h}" : string.Empty;
return(string.Format((string)property.Value, select + scale + tile));
case "frames":
return(string.Format((string)property.Value, PreviewMode ? 1 : Frames.NotBelow(1)));
case "variations":
case "other":
return((string)property.Value);
case "output":
if (PreviewMode || Frames < 2)
{
return(base.CollectArgument(property));
}
if (string.IsNullOrWhiteSpace((string)property.Value))
{
throw new ArgumentNullException(nameof(property.Value));
}
if (string.IsNullOrWhiteSpace(Output))
{
throw new InvalidOperationException(nameof(Output) + " is missing.");
}
string fileName = Path.GetFileNameWithoutExtension(Output);
string ext = Path.GetExtension(Output);
if (string.IsNullOrWhiteSpace(ext))
{
ext = ".jpg";
}
return(fileName + "%02d" + ext);
default:
return(base.CollectArgument(property));
}
}