processing

type EventLineHeader struct {
	// Index original entry index in absolute file offset
	Index int64
	// Index original entry index in absolute file offset, after Layer field onwards
	IndexFromLayer int64
	// Length of line in bytes
	Length int
	// Length of line in bytes, without Layer field
	LengthFromLayer int

	// Depth The placement in the display list, including nesting
	Depth types.Depth
	// Start When the frame appears
	Start time.Duration

	ReadOrder int
}

type EventLineHeaders []EventLineHeader