func Audio(buf []byte) (types.Type, error) {
	return doMatchMap(buf, matchers.Audio)
}
Audio tries to match a file as audio type
package filetype
import (
	"github.com/h2non/filetype/matchers"
	"github.com/h2non/filetype/types"
)
func Image(buf []byte) (types.Type, error) {
	return doMatchMap(buf, matchers.Image)
}
func IsImage(buf []byte) bool {
	kind, _ := Image(buf)
	return kind != types.Unknown
}