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 }