strange boxes udta and name

Author: Timur Nurutdinov

box.go

@@ -49,6 +49,7 @@ func init() {
 		"meta": DecodeMeta,
 		"mdat": DecodeMdat,
 		"free": DecodeFree,
+		"name": DecodeName,
 	}
 }
 

name.go

@@ -0,0 +1,42 @@
+package mp4
+
+import (
+	"io"
+	"io/ioutil"
+)
+
+// Name Box
+//
+// Status: not decoded
+type NameBox struct {
+	notDecoded []byte
+}
+
+func DecodeName(r io.Reader) (Box, error) {
+	data, err := ioutil.ReadAll(r)
+	if err != nil {
+		return nil, err
+	}
+	return &NameBox{
+		notDecoded: data[:],
+	}, nil
+}
+
+func (b *NameBox) Type() string {
+	return "name"
+}
+
+func (b *NameBox) Size() int {
+	return BoxHeaderSize + 4 + len(b.notDecoded)
+}
+
+func (b *NameBox) Encode(w io.Writer) error {
+	err := EncodeHeader(b, w)
+	if err != nil {
+		return err
+	}
+	buf := makebuf(b)
+	copy(buf[:], b.notDecoded)
+	_, err = w.Write(buf)
+	return err
+}

trak.go

@@ -11,6 +11,7 @@ type TrakBox struct {
 	Tkhd *TkhdBox
 	Mdia *MdiaBox
 	Edts *EdtsBox
+	Udta *UdtaBox
 }
 
 func DecodeTrak(r io.Reader) (Box, error) {
@@ -27,6 +28,8 @@ func DecodeTrak(r io.Reader) (Box, error) {
 			t.Mdia = b.(*MdiaBox)
 		case "edts":
 			t.Edts = b.(*EdtsBox)
+		case "udta":
+			t.Udta = b.(*UdtaBox)
 		default:
 			return nil, ErrBadFormat
 		}
@@ -44,6 +47,9 @@ func (b *TrakBox) Size() int {
 	if b.Edts != nil {
 		sz += b.Edts.Size()
 	}
+	if b.Udta != nil {
+		sz += b.Udta.Size()
+	}
 	return sz + BoxHeaderSize
 }
 
@@ -52,6 +58,9 @@ func (b *TrakBox) Dump() {
 	if b.Edts != nil {
 		b.Edts.Dump()
 	}
+	// if b.Udta != nil {
+	// 	b.Udta.Dump()
+	// }
 	b.Mdia.Dump()
 }
 
@@ -70,5 +79,11 @@ func (b *TrakBox) Encode(w io.Writer) error {
 			return err
 		}
 	}
+	if b.Udta != nil {
+		err = b.Udta.Encode(w)
+		if err != nil {
+			return err
+		}
+	}
 	return b.Mdia.Encode(w)
 }

udta.go

@@ -7,6 +7,7 @@ import "io"
 // Contained in: Movie Box (moov) or Track Box (trak)
 type UdtaBox struct {
 	Meta *MetaBox
+	Name *NameBox
 }
 
 func DecodeUdta(r io.Reader) (Box, error) {
@@ -19,6 +20,8 @@ func DecodeUdta(r io.Reader) (Box, error) {
 		switch b.Type() {
 		case "meta":
 			u.Meta = b.(*MetaBox)
+		case "name":
+			u.Name = b.(*NameBox)
 		default:
 			return nil, ErrBadFormat
 		}
@@ -31,13 +34,34 @@ func (b *UdtaBox) Type() string {
 }
 
 func (b *UdtaBox) Size() int {
-	return BoxHeaderSize + b.Meta.Size()
+	sz := BoxHeaderSize
+	if b.Meta != nil {
+		sz += b.Meta.Size()
+	}
+	if b.Name != nil {
+		sz += b.Name.Size()
+	}
+	return sz
 }
 
 func (b *UdtaBox) Encode(w io.Writer) error {
 	err := EncodeHeader(b, w)
 	if err != nil {
 		return err
 	}
-	return b.Meta.Encode(w)
+	if b.Meta != nil {
+		err = b.Meta.Encode(w)
+		if err != nil {
+			return err
+		}
+
+	}
+	if b.Name != nil {
+		err = b.Name.Encode(w)
+		if err != nil {
+			return err
+		}
+
+	}
+	return nil
 }