forked from Eyevinn/mp4ff
/
elng.go
58 lines (50 loc) · 1.12 KB
/
elng.go
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package mp4
import (
"io"
"io/ioutil"
)
// ElngBox - Extended Language Box
type ElngBox struct {
Language string
}
// CreateElng - Create an Extended Language Box
func CreateElng(language string) *ElngBox {
return &ElngBox{Language: language}
}
// DecodeElng - box-specific decode
func DecodeElng(hdr *boxHeader, startPos uint64, r io.Reader) (Box, error) {
data, err := ioutil.ReadAll(r)
if err != nil {
return nil, err
}
b := &ElngBox{
Language: string(data[:len(data)-1]),
}
return b, nil
}
// Type - box type
func (b *ElngBox) Type() string {
return "elng"
}
// Size - calculated size of box
func (b *ElngBox) Size() uint64 {
return uint64(boxHeaderSize + len(b.Language) + 1)
}
// Encode - write box to w
func (b *ElngBox) Encode(w io.Writer) error {
err := EncodeHeader(b, w)
if err != nil {
return err
}
_, err = w.Write([]byte(b.Language))
if err != nil {
return err
}
_, err = w.Write([]byte{0})
return err
}
func (b *ElngBox) Info(w io.Writer, specificBoxLevels, indent, indentStep string) error {
bd := newInfoDumper(w, indent, b, -1, 0)
bd.write(" - language: %s", b.Language)
return bd.err
}