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590 lines
11 KiB
Go
590 lines
11 KiB
Go
package tsio
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import (
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"fmt"
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"io"
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"time"
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"git.icomsys.co.kr/ljhwan026/joy4/utils/bits/pio"
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)
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const (
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StreamIdH264 = 0xe0
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StreamIdAAC = 0xc0
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)
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const (
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PAT_PID = 0
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PMT_PID = 0x1000
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)
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const TableIdPMT = 2
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const TableExtPMT = 1
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const TableIdPAT = 0
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const TableExtPAT = 1
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const MaxPESHeaderLength = 19
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const MaxTSHeaderLength = 12
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var ErrPESHeader = fmt.Errorf("invalid PES header")
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var ErrPSIHeader = fmt.Errorf("invalid PSI header")
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var ErrParsePMT = fmt.Errorf("invalid PMT")
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var ErrParsePAT = fmt.Errorf("invalid PAT")
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const (
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ElementaryStreamTypeH264 = 0x1B
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ElementaryStreamTypeAdtsAAC = 0x0F
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)
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type PATEntry struct {
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ProgramNumber uint16
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NetworkPID uint16
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ProgramMapPID uint16
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}
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type PAT struct {
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Entries []PATEntry
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}
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func (self PAT) Len() (n int) {
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return len(self.Entries) * 4
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}
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func (self PAT) Marshal(b []byte) (n int) {
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for _, entry := range self.Entries {
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pio.PutU16BE(b[n:], entry.ProgramNumber)
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n += 2
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if entry.ProgramNumber == 0 {
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pio.PutU16BE(b[n:], entry.NetworkPID&0x1fff|7<<13)
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n += 2
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} else {
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pio.PutU16BE(b[n:], entry.ProgramMapPID&0x1fff|7<<13)
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n += 2
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}
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}
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return
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}
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func (self *PAT) Unmarshal(b []byte) (n int, err error) {
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for n < len(b) {
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if n+4 <= len(b) {
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var entry PATEntry
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entry.ProgramNumber = pio.U16BE(b[n:])
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n += 2
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if entry.ProgramNumber == 0 {
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entry.NetworkPID = pio.U16BE(b[n:]) & 0x1fff
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n += 2
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} else {
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entry.ProgramMapPID = pio.U16BE(b[n:]) & 0x1fff
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n += 2
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}
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self.Entries = append(self.Entries, entry)
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} else {
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break
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}
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}
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if n < len(b) {
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err = ErrParsePAT
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return
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}
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return
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}
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type Descriptor struct {
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Tag uint8
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Data []byte
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}
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type ElementaryStreamInfo struct {
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StreamType uint8
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ElementaryPID uint16
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Descriptors []Descriptor
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}
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type PMT struct {
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PCRPID uint16
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ProgramDescriptors []Descriptor
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ElementaryStreamInfos []ElementaryStreamInfo
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}
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func (self PMT) Len() (n int) {
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// 111(3)
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// PCRPID(13)
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n += 2
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// desclen(16)
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n += 2
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for _, desc := range self.ProgramDescriptors {
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n += 2 + len(desc.Data)
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}
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for _, info := range self.ElementaryStreamInfos {
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// streamType
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n += 1
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// Reserved(3)
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// Elementary PID(13)
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n += 2
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// Reserved(6)
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// ES Info length length(10)
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n += 2
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for _, desc := range info.Descriptors {
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n += 2 + len(desc.Data)
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}
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}
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return
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}
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func (self PMT) fillDescs(b []byte, descs []Descriptor) (n int) {
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for _, desc := range descs {
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b[n] = desc.Tag
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n++
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b[n] = uint8(len(desc.Data))
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n++
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copy(b[n:], desc.Data)
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n += len(desc.Data)
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}
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return
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}
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func (self PMT) Marshal(b []byte) (n int) {
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// 111(3)
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// PCRPID(13)
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pio.PutU16BE(b[n:], self.PCRPID|7<<13)
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n += 2
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hold := n
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n += 2
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pos := n
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n += self.fillDescs(b[n:], self.ProgramDescriptors)
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desclen := n - pos
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pio.PutU16BE(b[hold:], uint16(desclen)|0xf<<12)
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for _, info := range self.ElementaryStreamInfos {
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b[n] = info.StreamType
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n++
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// Reserved(3)
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// Elementary PID(13)
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pio.PutU16BE(b[n:], info.ElementaryPID|7<<13)
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n += 2
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hold := n
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n += 2
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pos := n
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n += self.fillDescs(b[n:], info.Descriptors)
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desclen := n - pos
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pio.PutU16BE(b[hold:], uint16(desclen)|0x3c<<10)
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}
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return
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}
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func (self PMT) parseDescs(b []byte) (descs []Descriptor, err error) {
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n := 0
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for n < len(b) {
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if n+2 <= len(b) {
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desc := Descriptor{}
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desc.Tag = b[n]
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desc.Data = make([]byte, b[n+1])
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n += 2
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if n+len(desc.Data) < len(b) {
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copy(desc.Data, b[n:])
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descs = append(descs, desc)
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n += len(desc.Data)
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} else {
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break
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}
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} else {
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break
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}
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}
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if n < len(b) {
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err = ErrParsePMT
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return
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}
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return
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}
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func (self *PMT) Unmarshal(b []byte) (n int, err error) {
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if len(b) < n+4 {
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err = ErrParsePMT
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return
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}
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// 111(3)
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// PCRPID(13)
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self.PCRPID = pio.U16BE(b[0:2]) & 0x1fff
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n += 2
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// Reserved(4)=0xf
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// Reserved(2)=0x0
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// Program info length(10)
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desclen := int(pio.U16BE(b[2:4]) & 0x3ff)
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n += 2
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if desclen > 0 {
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if len(b) < n+desclen {
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err = ErrParsePMT
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return
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}
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if self.ProgramDescriptors, err = self.parseDescs(b[n : n+desclen]); err != nil {
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return
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}
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n += desclen
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}
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for n < len(b) {
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if len(b) < n+5 {
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err = ErrParsePMT
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return
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}
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var info ElementaryStreamInfo
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info.StreamType = b[n]
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n++
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// Reserved(3)
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// Elementary PID(13)
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info.ElementaryPID = pio.U16BE(b[n:]) & 0x1fff
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n += 2
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// Reserved(6)
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// ES Info length(10)
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desclen := int(pio.U16BE(b[n:]) & 0x3ff)
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n += 2
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if desclen > 0 {
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if len(b) < n+desclen {
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err = ErrParsePMT
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return
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}
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if info.Descriptors, err = self.parseDescs(b[n : n+desclen]); err != nil {
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return
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}
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n += desclen
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}
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self.ElementaryStreamInfos = append(self.ElementaryStreamInfos, info)
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}
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return
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}
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func ParsePSI(h []byte) (tableid uint8, tableext uint16, hdrlen int, datalen int, err error) {
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if len(h) < 8 {
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err = ErrPSIHeader
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return
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}
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// pointer(8)
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pointer := h[0]
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hdrlen++
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if pointer > 0 {
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hdrlen += int(pointer)
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if len(h) < hdrlen {
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err = ErrPSIHeader
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return
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}
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}
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if len(h) < hdrlen+12 {
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err = ErrPSIHeader
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return
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}
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// table_id(8)
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tableid = h[hdrlen]
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hdrlen++
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// section_syntax_indicator(1)=1,private_bit(1)=0,reserved(2)=3,unused(2)=0,section_length(10)
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datalen = int(pio.U16BE(h[hdrlen:]))&0x3ff - 9
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hdrlen += 2
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if datalen < 0 {
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err = ErrPSIHeader
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return
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}
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// Table ID extension(16)
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tableext = pio.U16BE(h[hdrlen:])
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hdrlen += 2
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// resverd(2)=3
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// version(5)
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// Current_next_indicator(1)
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hdrlen++
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// section_number(8)
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hdrlen++
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// last_section_number(8)
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hdrlen++
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// data
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// crc(32)
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return
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}
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const PSIHeaderLength = 9
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func FillPSI(h []byte, tableid uint8, tableext uint16, datalen int) (n int) {
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// pointer(8)
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h[n] = 0
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n++
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// table_id(8)
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h[n] = tableid
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n++
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// section_syntax_indicator(1)=1,private_bit(1)=0,reserved(2)=3,unused(2)=0,section_length(10)
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pio.PutU16BE(h[n:], uint16(0xa<<12|2+3+4+datalen))
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n += 2
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// Table ID extension(16)
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pio.PutU16BE(h[n:], tableext)
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n += 2
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// resverd(2)=3,version(5)=0,Current_next_indicator(1)=1
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h[n] = 0x3<<6 | 1
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n++
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// section_number(8)
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h[n] = 0
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n++
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// last_section_number(8)
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h[n] = 0
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n++
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n += datalen
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crc := calcCRC32(0xffffffff, h[1:n])
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pio.PutU32LE(h[n:], crc)
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n += 4
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return
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}
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func TimeToPCR(tm time.Duration) (pcr uint64) {
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// base(33)+resverd(6)+ext(9)
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ts := uint64(tm * PCR_HZ / time.Second)
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base := ts / 300
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ext := ts % 300
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pcr = base<<15 | 0x3f<<9 | ext
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return
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}
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func PCRToTime(pcr uint64) (tm time.Duration) {
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base := pcr >> 15
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ext := pcr & 0x1ff
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ts := base*300 + ext
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tm = time.Duration(ts) * time.Second / time.Duration(PCR_HZ)
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return
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}
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func TimeToTs(tm time.Duration) (v uint64) {
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ts := uint64(tm * PTS_HZ / time.Second)
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// 0010 PTS 32..30 1 PTS 29..15 1 PTS 14..00 1
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v = ((ts>>30)&0x7)<<33 | ((ts>>15)&0x7fff)<<17 | (ts&0x7fff)<<1 | 0x100010001
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return
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}
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func TsToTime(v uint64) (tm time.Duration) {
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// 0010 PTS 32..30 1 PTS 29..15 1 PTS 14..00 1
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ts := (((v >> 33) & 0x7) << 30) | (((v >> 17) & 0x7fff) << 15) | ((v >> 1) & 0x7fff)
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tm = time.Duration(ts) * time.Second / time.Duration(PTS_HZ)
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return
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}
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const (
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PTS_HZ = 90000
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PCR_HZ = 27000000
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)
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func ParsePESHeader(h []byte) (hdrlen int, streamid uint8, datalen int, pts, dts time.Duration, err error) {
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if h[0] != 0 || h[1] != 0 || h[2] != 1 {
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err = ErrPESHeader
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return
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}
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streamid = h[3]
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flags := h[7]
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hdrlen = int(h[8]) + 9
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datalen = int(pio.U16BE(h[4:6]))
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if datalen > 0 {
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datalen -= int(h[8]) + 3
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}
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const PTS = 1 << 7
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const DTS = 1 << 6
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if flags&PTS != 0 {
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if len(h) < 14 {
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err = ErrPESHeader
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return
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}
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pts = TsToTime(pio.U40BE(h[9:14]))
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if flags&DTS != 0 {
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if len(h) < 19 {
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err = ErrPESHeader
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return
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}
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dts = TsToTime(pio.U40BE(h[14:19]))
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}
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}
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return
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}
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func FillPESHeader(h []byte, streamid uint8, datalen int, pts, dts time.Duration) (n int) {
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h[0] = 0
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h[1] = 0
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h[2] = 1
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h[3] = streamid
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const PTS = 1 << 7
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const DTS = 1 << 6
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var flags uint8
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if pts != 0 {
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flags |= PTS
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if dts != 0 {
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flags |= DTS
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}
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}
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if flags&PTS != 0 {
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n += 5
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}
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if flags&DTS != 0 {
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n += 5
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}
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// packet_length(16) if zero then variable length
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// Specifies the number of bytes remaining in the packet after this field. Can be zero.
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// If the PES packet length is set to zero, the PES packet can be of any length.
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// A value of zero for the PES packet length can be used only when the PES packet payload is a **video** elementary stream.
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var pktlen uint16
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if datalen >= 0 {
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pktlen = uint16(datalen + n + 3)
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}
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pio.PutU16BE(h[4:6], pktlen)
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h[6] = 2<<6 | 1 // resverd(6,2)=2,original_or_copy(0,1)=1
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h[7] = flags
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h[8] = uint8(n)
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// pts(40)?
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// dts(40)?
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if flags&PTS != 0 {
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if flags&DTS != 0 {
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pio.PutU40BE(h[9:14], TimeToTs(pts)|3<<36)
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pio.PutU40BE(h[14:19], TimeToTs(dts)|1<<36)
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} else {
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pio.PutU40BE(h[9:14], TimeToTs(pts)|2<<36)
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}
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}
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n += 9
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return
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}
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type TSWriter struct {
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w io.Writer
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ContinuityCounter uint
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tshdr []byte
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}
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func NewTSWriter(pid uint16) *TSWriter {
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w := &TSWriter{}
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w.tshdr = make([]byte, 188)
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w.tshdr[0] = 0x47
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pio.PutU16BE(w.tshdr[1:3], pid&0x1fff)
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for i := 6; i < 188; i++ {
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w.tshdr[i] = 0xff
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}
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return w
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}
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func (self *TSWriter) WritePackets(w io.Writer, datav [][]byte, pcr time.Duration, sync bool, paddata bool) (err error) {
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datavlen := pio.VecLen(datav)
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writev := make([][]byte, len(datav))
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writepos := 0
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for writepos < datavlen {
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self.tshdr[1] = self.tshdr[1] & 0x1f
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self.tshdr[3] = byte(self.ContinuityCounter)&0xf | 0x30
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self.tshdr[5] = 0 // flags
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hdrlen := 6
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self.ContinuityCounter++
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if writepos == 0 {
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self.tshdr[1] = 0x40 | self.tshdr[1] // Payload Unit Start Indicator
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if pcr != 0 {
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hdrlen += 6
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self.tshdr[5] = 0x10 | self.tshdr[5] // PCR flag (Discontinuity indicator 0x80)
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pio.PutU48BE(self.tshdr[6:12], TimeToPCR(pcr))
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}
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if sync {
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self.tshdr[5] = 0x40 | self.tshdr[5] // Random Access indicator
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}
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}
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padtail := 0
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end := writepos + 188 - hdrlen
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if end > datavlen {
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if paddata {
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padtail = end - datavlen
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} else {
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hdrlen += end - datavlen
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}
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end = datavlen
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}
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n := pio.VecSliceTo(datav, writev, writepos, end)
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self.tshdr[4] = byte(hdrlen) - 5 // length
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if _, err = w.Write(self.tshdr[:hdrlen]); err != nil {
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return
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}
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for i := 0; i < n; i++ {
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if _, err = w.Write(writev[i]); err != nil {
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return
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}
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}
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if padtail > 0 {
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if _, err = w.Write(self.tshdr[188-padtail : 188]); err != nil {
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return
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}
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}
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writepos = end
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}
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return
|
|
}
|
|
|
|
func ParseTSHeader(tshdr []byte) (pid uint16, start bool, iskeyframe bool, hdrlen int, err error) {
|
|
// https://en.wikipedia.org/wiki/MPEG_transport_stream
|
|
if tshdr[0] != 0x47 {
|
|
err = fmt.Errorf("tshdr sync invalid")
|
|
return
|
|
}
|
|
pid = uint16((tshdr[1]&0x1f))<<8 | uint16(tshdr[2])
|
|
start = tshdr[1]&0x40 != 0
|
|
hdrlen += 4
|
|
if tshdr[3]&0x20 != 0 {
|
|
hdrlen += int(tshdr[4]) + 1
|
|
iskeyframe = tshdr[5]&0x40 != 0
|
|
}
|
|
return
|
|
}
|