codec

type Codec interface {
	String() string

	Flags([]cli.Flag) []cli.Flag
	Extensions() []string

	CanEncode() bool

	Sniff(io.ReaderAt) (int, []byte, error)
	Decode(io.Reader) (image.Image, error)
	Encode(io.Writer, image.Image, opts.Common) error
}

type Sniffed struct {
	Header     []byte
	Confidence int
	Codec      Codec
}