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extend.go
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/
extend.go
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package fmp4io
import "github.com/ogsts/vdk/utils/bits/pio"
const MVEX = Tag(0x6d766578)
type MovieExtend struct {
Tracks []*TrackExtend
Unknowns []Atom
AtomPos
}
func (a MovieExtend) Marshal(b []byte) (n int) {
pio.PutU32BE(b[4:], uint32(MVEX))
n += a.marshal(b[8:]) + 8
pio.PutU32BE(b[0:], uint32(n))
return
}
func (a MovieExtend) marshal(b []byte) (n int) {
for _, atom := range a.Tracks {
n += atom.Marshal(b[n:])
}
for _, atom := range a.Unknowns {
n += atom.Marshal(b[n:])
}
return
}
func (a MovieExtend) Len() (n int) {
n += 8
for _, atom := range a.Tracks {
n += atom.Len()
}
for _, atom := range a.Unknowns {
n += atom.Len()
}
return
}
func (a *MovieExtend) Unmarshal(b []byte, offset int) (n int, err error) {
(&a.AtomPos).setPos(offset, len(b))
n += 8
for n+8 < len(b) {
tag := Tag(pio.U32BE(b[n+4:]))
size := int(pio.U32BE(b[n:]))
if len(b) < n+size {
err = parseErr("TagSizeInvalid", n+offset, err)
return
}
switch tag {
case TREX:
{
atom := &TrackExtend{}
if _, err = atom.Unmarshal(b[n:n+size], offset+n); err != nil {
err = parseErr("trex", n+offset, err)
return
}
a.Tracks = append(a.Tracks, atom)
}
default:
{
atom := &Dummy{Tag_: tag, Data: b[n : n+size]}
if _, err = atom.Unmarshal(b[n:n+size], offset+n); err != nil {
err = parseErr("", n+offset, err)
return
}
a.Unknowns = append(a.Unknowns, atom)
}
}
n += size
}
return
}
func (a MovieExtend) Children() (r []Atom) {
for _, atom := range a.Tracks {
r = append(r, atom)
}
r = append(r, a.Unknowns...)
return
}
func (a MovieExtend) Tag() Tag {
return MVEX
}
const TREX = Tag(0x74726578)
type TrackExtend struct {
Version uint8
Flags uint32
TrackID uint32
DefaultSampleDescIdx uint32
DefaultSampleDuration uint32
DefaultSampleSize uint32
DefaultSampleFlags uint32
AtomPos
}
func (a TrackExtend) Marshal(b []byte) (n int) {
pio.PutU32BE(b[4:], uint32(TREX))
n += a.marshal(b[8:]) + 8
pio.PutU32BE(b[0:], uint32(n))
return
}
func (a TrackExtend) marshal(b []byte) (n int) {
pio.PutU8(b[n:], a.Version)
n += 1
pio.PutU24BE(b[n:], a.Flags)
n += 3
pio.PutU32BE(b[n:], a.TrackID)
n += 4
pio.PutU32BE(b[n:], a.DefaultSampleDescIdx)
n += 4
pio.PutU32BE(b[n:], a.DefaultSampleDuration)
n += 4
pio.PutU32BE(b[n:], a.DefaultSampleSize)
n += 4
pio.PutU32BE(b[n:], a.DefaultSampleFlags)
n += 4
return
}
func (a TrackExtend) Len() (n int) {
n += 8
n += 1
n += 3
n += 4
n += 4
n += 4
n += 4
n += 4
return
}
func (a *TrackExtend) Unmarshal(b []byte, offset int) (n int, err error) {
(&a.AtomPos).setPos(offset, len(b))
n += 8
if len(b) < n+1 {
err = parseErr("Version", n+offset, err)
return
}
a.Version = pio.U8(b[n:])
n += 1
if len(b) < n+3 {
err = parseErr("Flags", n+offset, err)
return
}
a.Flags = pio.U24BE(b[n:])
n += 3
if len(b) < n+4 {
err = parseErr("TrackID", n+offset, err)
return
}
a.TrackID = pio.U32BE(b[n:])
n += 4
if len(b) < n+4 {
err = parseErr("DefaultSampleDescIdx", n+offset, err)
return
}
a.DefaultSampleDescIdx = pio.U32BE(b[n:])
n += 4
if len(b) < n+4 {
err = parseErr("DefaultSampleDuration", n+offset, err)
return
}
a.DefaultSampleDuration = pio.U32BE(b[n:])
n += 4
if len(b) < n+4 {
err = parseErr("DefaultSampleSize", n+offset, err)
return
}
a.DefaultSampleSize = pio.U32BE(b[n:])
n += 4
if len(b) < n+4 {
err = parseErr("DefaultSampleFlags", n+offset, err)
return
}
a.DefaultSampleFlags = pio.U32BE(b[n:])
n += 4
return
}
func (a TrackExtend) Children() (r []Atom) {
return
}
func (a TrackExtend) Tag() Tag {
return TREX
}