video config construction refactoring

internal/video/config.go

@@ -0,0 +1,31 @@
+package video
+
+import (
+	"mxl-pattern-generator/internal/flowdef"
+
+	"github.com/qvest-digital/go-mxl/mxl"
+)
+
+type Config struct {
+	Definition flowdef.Video
+	Pattern    string
+}
+
+func (c Config) ID() string {
+	return c.Definition.ID
+}
+
+func (c Config) Width() uint {
+	return c.Definition.FrameWidth
+}
+
+func (c Config) Height() uint {
+	return c.Definition.FrameHeight
+}
+
+func (c Config) Rate() mxl.Rational {
+	return mxl.Rational{
+		Num: int64(c.Definition.GrainRate.Numerator),
+		Den: int64(c.Definition.GrainRate.Denominator),
+	}
+}