示例#1
0
        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));
            }
        }