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add packet_length field for PES Header

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This commit is contained in:
nareix 2016-03-09 01:25:20 +08:00
parent 443a7e4869
commit a623b75470
1 changed files with 11 additions and 5 deletions
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16
writer.go
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@ -305,10 +305,10 @@ func bswap32(v uint) uint {
return (v>>24)|((v>>16)&0xff)<<8|((v>>8)&0xff)<<16|(v&0xff)<<24
}
func WritePESHeader(w io.Writer, self PESHeader) (err error) {
func WritePESHeader(w io.Writer, self PESHeader, dataLength int) (err error) {
// http://dvd.sourceforge.net/dvdinfo/pes-hdr.html
var pts_dts_flags, header_length uint
var pts_dts_flags, header_length, packet_length uint
// start code(24) 000001
// StreamId(8)
@ -347,8 +347,14 @@ func WritePESHeader(w io.Writer, self PESHeader) (err error) {
header_length += 5
}
if dataLength > 0 {
packet_length = uint(dataLength) + header_length + 3
}
// packet_length(16) if zero then variable length
if err = WriteUInt(w, 0, 2); err != nil {
// Specifies the number of bytes remaining in the packet after this field. Can be zero.
// If the PES packet length is set to zero, the PES packet can be of any length.
// A value of zero for the PES packet length can be used only when the PES packet payload is a video elementary stream.
if err = WriteUInt(w, packet_length, 2); err != nil {
return
}
@ -389,7 +395,7 @@ func WritePESHeader(w io.Writer, self PESHeader) (err error) {
func WritePESPacket(w *TSWriter, header PESHeader, data []byte) (err error) {
bw := &bytes.Buffer{}
if err = WritePESHeader(bw, header); err != nil {
if err = WritePESHeader(bw, header, len(data)); err != nil {
return
}
iov := &iovec{}
@ -654,7 +660,7 @@ func (self *SimpleH264Writer) WriteNALU(sync bool, duration int, nalu []byte) (e
StreamId: StreamIdH264,
PTS: uint64(self.PTS)*PTS_HZ/uint64(self.TimeScale),
}
if err = WritePESHeader(self.pesBuf, pes); err != nil {
if err = WritePESHeader(self.pesBuf, pes, 0); err != nil {
return
}