forked from Eyevinn/mp4ff
/
uuid.go
210 lines (192 loc) · 5.37 KB
/
uuid.go
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package mp4
import (
"encoding/hex"
"io"
"io/ioutil"
)
const (
uuidTfxd = "\x6d\x1d\x9b\x05\x42\xd5\x44\xe6\x80\xe2\x14\x1d\xaf\xf7\x57\xb2"
uuidTfrf = "\xd4\x80\x7e\xf2\xca\x39\x46\x95\x8e\x54\x26\xcb\x9e\x46\xa7\x9f"
)
// UUIDBox - Used as container for MSS boxes tfxd and tfrf
type UUIDBox struct {
UUID string // 16 bytes
SubType string
Tfxd *TfxdData
Tfrf *TfrfData
}
// TfxdData - MSS TfxdBox data after UUID part
// Defined in MSS-SSTR v20180912 section 2.2.4.4
type TfxdData struct {
Version byte
Flags uint32
FragmentAbsoluteTime uint64
FragmentAbsoluteDuration uint64
}
// TfrfData - MSS TfrfBox data after UUID part
// Defined in MSS-SSTR v20180912 section 2.2.4.5
type TfrfData struct {
Version byte
Flags uint32
FragmentCount byte
FragmentAbsoluteTimes []uint64
FragmentAbsoluteDurations []uint64
}
// DecodeUUIDBox - decode a UUID box including tfxd or tfrf
func DecodeUUID(hdr *boxHeader, startPos uint64, r io.Reader) (Box, error) {
data, err := ioutil.ReadAll(r)
if err != nil {
return nil, err
}
u := &UUIDBox{}
s := NewSliceReader(data)
u.UUID = string(s.ReadBytes(16))
switch u.UUID {
case uuidTfxd:
u.SubType = "tfxd"
tfxd, err := decodeTfxd(s)
if err != nil {
return nil, err
}
u.Tfxd = tfxd
case uuidTfrf:
u.SubType = "tfrf"
tfrf, err := decodeTfrf(s)
if err != nil {
return nil, err
}
u.Tfrf = tfrf
default:
// err := fmt.Errorf("Unknown uuid=%s", u.UUID)
// return nil, err
}
return u, err
}
// Type - return box type
func (u *UUIDBox) Type() string {
return "uuid"
}
// Size - return calculated size including tfxd/tfrf
func (u *UUIDBox) Size() uint64 {
var size uint64 = 8 + 16
switch u.SubType {
case "tfxd":
size += u.Tfxd.size()
case "tfrf":
size += u.Tfrf.size()
}
return size
}
// Encode - write UUIDBox including tfxd or tfrf to w
func (u *UUIDBox) Encode(w io.Writer) error {
err := EncodeHeader(u, w)
if err != nil {
return err
}
_, err = w.Write([]byte(u.UUID))
if u.SubType == "tfxd" {
err = u.Tfxd.encode(w)
} else if u.SubType == "tfrf" {
err = u.Tfrf.encode(w)
}
return err
}
func decodeTfxd(s *SliceReader) (*TfxdData, error) {
versionAndFlags := s.ReadUint32()
version := byte(versionAndFlags >> 24)
var fragmentAbsoluteTime uint64
var fragmentAbsoluteDuration uint64
if version == 0 {
fragmentAbsoluteTime = uint64(s.ReadUint32())
fragmentAbsoluteDuration = uint64(s.ReadUint32())
} else {
fragmentAbsoluteTime = s.ReadUint64()
fragmentAbsoluteDuration = s.ReadUint64()
}
t := &TfxdData{
Version: version,
Flags: versionAndFlags & flagsMask,
FragmentAbsoluteTime: fragmentAbsoluteTime,
FragmentAbsoluteDuration: fragmentAbsoluteDuration,
}
return t, nil
}
func (t *TfxdData) size() uint64 {
return 4 + 8 + 8*uint64(t.Version)
}
func (t *TfxdData) encode(w io.Writer) error {
buf := make([]byte, t.size())
sw := NewSliceWriter(buf)
versionAndFlags := (uint32(t.Version) << 24) + t.Flags
sw.WriteUint32(versionAndFlags)
if t.Version == 0 {
sw.WriteUint32(uint32(t.FragmentAbsoluteTime))
sw.WriteUint32(uint32(t.FragmentAbsoluteDuration))
} else {
sw.WriteUint64(t.FragmentAbsoluteTime)
sw.WriteUint64(t.FragmentAbsoluteDuration)
}
_, err := w.Write(buf)
return err
}
func decodeTfrf(s *SliceReader) (*TfrfData, error) {
versionAndFlags := s.ReadUint32()
version := byte(versionAndFlags >> 24)
t := &TfrfData{
Version: version,
Flags: versionAndFlags & flagsMask,
FragmentCount: s.ReadUint8(),
}
if t.Version == 0 {
for i := byte(0); i < t.FragmentCount; i++ {
t.FragmentAbsoluteTimes = append(t.FragmentAbsoluteTimes, uint64(s.ReadUint32()))
t.FragmentAbsoluteDurations = append(t.FragmentAbsoluteDurations, uint64(s.ReadUint32()))
}
} else {
for i := byte(0); i < t.FragmentCount; i++ {
t.FragmentAbsoluteTimes = append(t.FragmentAbsoluteTimes, s.ReadUint64())
t.FragmentAbsoluteDurations = append(t.FragmentAbsoluteDurations, s.ReadUint64())
}
}
return t, nil
}
func (t *TfrfData) size() uint64 {
return 4 + 1 + (8+8*uint64(t.Version))*uint64(t.FragmentCount)
}
func (t *TfrfData) encode(w io.Writer) error {
buf := make([]byte, t.size())
sw := NewSliceWriter(buf)
versionAndFlags := (uint32(t.Version) << 24) + t.Flags
sw.WriteUint32(versionAndFlags)
sw.WriteUint8(t.FragmentCount)
if t.Version == 0 {
for i := byte(0); i < t.FragmentCount; i++ {
sw.WriteUint32(uint32(t.FragmentAbsoluteTimes[i]))
sw.WriteUint32(uint32(t.FragmentAbsoluteDurations[i]))
}
} else {
for i := byte(0); i < t.FragmentCount; i++ {
sw.WriteUint64(t.FragmentAbsoluteTimes[i])
sw.WriteUint64(t.FragmentAbsoluteDurations[i])
}
}
_, err := w.Write(buf)
return err
}
func (u *UUIDBox) Info(w io.Writer, specificBoxLevels, indent, indentStep string) error {
bd := newInfoDumper(w, indent, u, -1, 0)
bd.write(" - uuid: %s", hex.EncodeToString([]byte(u.UUID)))
bd.write(" - subType: %s", u.SubType)
level := getInfoLevel(u, specificBoxLevels)
if level > 0 {
switch u.SubType {
case "tfxd":
bd.write(" - absTime=%d absDur=%d", u.Tfxd.FragmentAbsoluteTime, u.Tfxd.FragmentAbsoluteDuration)
case "tfrf":
for i := 0; i < int(u.Tfrf.FragmentCount); i++ {
bd.write(" - [%d]: absTime=%d absDur=%d", i+1, u.Tfrf.FragmentAbsoluteTimes[i], u.Tfrf.FragmentAbsoluteDurations[i])
}
}
}
return bd.err
}