package mpd

// Rewriter transforms an upstream live MPD into something N_m3u8DL-RE can
// refresh safely. Apps that need DAI/colon stripping or synthetic timelines
// implement this; others return Passthrough.
type Rewriter interface {
	Name() string
	Rewrite(upstreamXML []byte, kidHint string) (out []byte, err error)
}

// Passthrough leaves the MPD unchanged.
type Passthrough struct{}

func (Passthrough) Name() string { return "none" }
func (Passthrough) Rewrite(in []byte, _ string) ([]byte, error) { return in, nil }