/
TrackEncryption.go
75 lines (71 loc) · 1.73 KB
/
TrackEncryption.go
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package sofia
import (
"encoding/binary"
"io"
)
// ISO/IEC 23001-7
// aligned(8) class TrackEncryptionBox extends FullBox('tenc', version, flags=0) {
// unsigned int(8) reserved = 0;
// if (version==0) {
// unsigned int(8) reserved = 0;
// } else { // version is 1 or greater
// unsigned int(4) default_crypt_byte_block;
// unsigned int(4) default_skip_byte_block;
// }
// unsigned int(8) default_isProtected;
// unsigned int(8) default_Per_Sample_IV_Size;
// unsigned int(8)[16] default_KID;
// if (default_isProtected ==1 && default_Per_Sample_IV_Size == 0) {
// unsigned int(8) default_constant_IV_size;
// unsigned int(8)[default_constant_IV_size] default_constant_IV;
// }
// }
type TrackEncryption struct {
BoxHeader BoxHeader
FullBoxHeader FullBoxHeader
Extends struct {
_ uint8
_ uint8
DefaultIsProtected uint8
DefaultPerSampleIvSize uint8
}
DefaultKid UUID
}
func (t *TrackEncryption) read(r io.Reader) error {
err := t.BoxHeader.read(r)
if err != nil {
return err
}
err = t.FullBoxHeader.read(r)
if err != nil {
return err
}
err = binary.Read(r, binary.BigEndian, &t.Extends)
if err != nil {
return err
}
_, err = io.ReadFull(r, t.DefaultKid[:])
if err != nil {
return err
}
return nil
}
func (t TrackEncryption) write(w io.Writer) error {
err := t.BoxHeader.write(w)
if err != nil {
return err
}
err = t.FullBoxHeader.write(w)
if err != nil {
return err
}
err = binary.Write(w, binary.BigEndian, t.Extends)
if err != nil {
return err
}
_, err = w.Write(t.DefaultKid[:])
if err != nil {
return err
}
return nil
}