file.go

type Codec interface {
   Encode(data []int) ([]int, error)
   Decode(data []int) ([]int, error)
} 

type H264 struct {
}

func (H264) Encode(data []int) ([]int, error) {
  // ... lots of code
  return data, nil
}

var supportedCodecs := []Codec{H264{}, AV1{}}

func Encode(codec string, data int[]) {
 // here we can chose e use
 // supportedCodecs[0].Encode(data)
}