You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
114 lines
2.4 KiB
Go
114 lines
2.4 KiB
Go
package mp4fio
|
|
|
|
import (
|
|
"git.icomsys.co.kr/ljhwan026/joy4/format/mp4/mp4io"
|
|
"git.icomsys.co.kr/ljhwan026/joy4/utils/bits/pio"
|
|
)
|
|
|
|
type ElemStreamDesc struct {
|
|
DecConfig []byte
|
|
TrackId uint16
|
|
mp4io.AtomPos
|
|
}
|
|
|
|
func (self ElemStreamDesc) Children() []mp4io.Atom {
|
|
return nil
|
|
}
|
|
|
|
func (self ElemStreamDesc) fillLength(b []byte, length int) (n int) {
|
|
b[n] = uint8(length & 0x7f)
|
|
n++
|
|
return
|
|
}
|
|
|
|
func (self ElemStreamDesc) lenDescHdr() (n int) {
|
|
return 2
|
|
}
|
|
|
|
func (self ElemStreamDesc) fillDescHdr(b []byte, tag uint8, datalen int) (n int) {
|
|
b[n] = tag
|
|
n++
|
|
n += self.fillLength(b[n:], datalen)
|
|
return
|
|
}
|
|
|
|
func (self ElemStreamDesc) lenESDescHdr() (n int) {
|
|
return self.lenDescHdr() + 3
|
|
}
|
|
|
|
func (self ElemStreamDesc) fillESDescHdr(b []byte, datalen int) (n int) {
|
|
n += self.fillDescHdr(b[n:], mp4io.MP4ESDescrTag, datalen)
|
|
pio.PutU16BE(b[n:], self.TrackId)
|
|
n += 2
|
|
b[n] = 0 // flags
|
|
n++
|
|
return
|
|
}
|
|
|
|
func (self ElemStreamDesc) lenDecConfigDescHdr() (n int) {
|
|
return self.lenDescHdr() + 2 + 3 + 4 + 4 + self.lenDescHdr()
|
|
}
|
|
|
|
func (self ElemStreamDesc) fillDecConfigDescHdr(b []byte, datalen int) (n int) {
|
|
n += self.fillDescHdr(b[n:], mp4io.MP4DecConfigDescrTag, datalen)
|
|
b[n] = 0x40 // objectid
|
|
n++
|
|
b[n] = 0x15 // streamtype
|
|
n++
|
|
// buffer size db
|
|
pio.PutU24BE(b[n:], 0)
|
|
n += 3
|
|
// max bitrage
|
|
pio.PutU32BE(b[n:], uint32(200000))
|
|
n += 4
|
|
// avg bitrage
|
|
pio.PutU32BE(b[n:], uint32(0))
|
|
n += 4
|
|
n += self.fillDescHdr(b[n:], mp4io.MP4DecSpecificDescrTag, datalen-n)
|
|
return
|
|
}
|
|
|
|
func (self ElemStreamDesc) Len() (n int) {
|
|
// len + tag
|
|
return 8 +
|
|
// ver + flags
|
|
4 +
|
|
self.lenESDescHdr() +
|
|
self.lenDecConfigDescHdr() +
|
|
len(self.DecConfig) +
|
|
self.lenDescHdr() + 1
|
|
}
|
|
|
|
// Version(4)
|
|
// ESDesc(
|
|
// MP4ESDescrTag
|
|
// ESID(2)
|
|
// ESFlags(1)
|
|
// DecConfigDesc(
|
|
// MP4DecConfigDescrTag
|
|
// objectId streamType bufSize avgBitrate
|
|
// DecSpecificDesc(
|
|
// MP4DecSpecificDescrTag
|
|
// decConfig
|
|
// )
|
|
// )
|
|
// ?Desc(lenDescHdr+1)
|
|
// )
|
|
|
|
func (self ElemStreamDesc) Marshal(b []byte) (n int) {
|
|
pio.PutU32BE(b[4:], uint32(mp4io.ESDS))
|
|
n += 8
|
|
pio.PutU32BE(b[n:], 0) // Version
|
|
n += 4
|
|
datalen := self.Len()
|
|
n += self.fillESDescHdr(b[n:], datalen-n-self.lenESDescHdr()+3)
|
|
n += self.fillDecConfigDescHdr(b[n:], datalen-n-self.lenDescHdr()-3)
|
|
copy(b[n:], self.DecConfig)
|
|
n += len(self.DecConfig)
|
|
n += self.fillDescHdr(b[n:], 0x06, datalen-n-self.lenDescHdr())
|
|
b[n] = 0x02
|
|
n++
|
|
pio.PutU32BE(b[0:], uint32(n))
|
|
return
|
|
}
|