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Add 'ts/' from commit '7530d353fdefcc59d83c3c8ebea0a147dcbab234'

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git-subtree-dir: ts
git-subtree-mainline: 92528599badd9da7f5b10d64f10186a1646bb520
git-subtree-split: 7530d353fdefcc59d83c3c8ebea0a147dcbab234
This commit is contained in:
nareix 2016-07-01 21:33:16 +08:00
commit 3bd15c08fd
14 changed files with 2200 additions and 0 deletions
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2
ts/README.md Normal file
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102
ts/checksum.go Normal file
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package ts
import (
"encoding/hex"
"fmt"
"io"
)
var ieeeCrc32Tbl = []uint32{
0x00000000, 0xB71DC104, 0x6E3B8209, 0xD926430D, 0xDC760413, 0x6B6BC517,
0xB24D861A, 0x0550471E, 0xB8ED0826, 0x0FF0C922, 0xD6D68A2F, 0x61CB4B2B,
0x649B0C35, 0xD386CD31, 0x0AA08E3C, 0xBDBD4F38, 0x70DB114C, 0xC7C6D048,
0x1EE09345, 0xA9FD5241, 0xACAD155F, 0x1BB0D45B, 0xC2969756, 0x758B5652,
0xC836196A, 0x7F2BD86E, 0xA60D9B63, 0x11105A67, 0x14401D79, 0xA35DDC7D,
0x7A7B9F70, 0xCD665E74, 0xE0B62398, 0x57ABE29C, 0x8E8DA191, 0x39906095,
0x3CC0278B, 0x8BDDE68F, 0x52FBA582, 0xE5E66486, 0x585B2BBE, 0xEF46EABA,
0x3660A9B7, 0x817D68B3, 0x842D2FAD, 0x3330EEA9, 0xEA16ADA4, 0x5D0B6CA0,
0x906D32D4, 0x2770F3D0, 0xFE56B0DD, 0x494B71D9, 0x4C1B36C7, 0xFB06F7C3,
0x2220B4CE, 0x953D75CA, 0x28803AF2, 0x9F9DFBF6, 0x46BBB8FB, 0xF1A679FF,
0xF4F63EE1, 0x43EBFFE5, 0x9ACDBCE8, 0x2DD07DEC, 0x77708634, 0xC06D4730,
0x194B043D, 0xAE56C539, 0xAB068227, 0x1C1B4323, 0xC53D002E, 0x7220C12A,
0xCF9D8E12, 0x78804F16, 0xA1A60C1B, 0x16BBCD1F, 0x13EB8A01, 0xA4F64B05,
0x7DD00808, 0xCACDC90C, 0x07AB9778, 0xB0B6567C, 0x69901571, 0xDE8DD475,
0xDBDD936B, 0x6CC0526F, 0xB5E61162, 0x02FBD066, 0xBF469F5E, 0x085B5E5A,
0xD17D1D57, 0x6660DC53, 0x63309B4D, 0xD42D5A49, 0x0D0B1944, 0xBA16D840,
0x97C6A5AC, 0x20DB64A8, 0xF9FD27A5, 0x4EE0E6A1, 0x4BB0A1BF, 0xFCAD60BB,
0x258B23B6, 0x9296E2B2, 0x2F2BAD8A, 0x98366C8E, 0x41102F83, 0xF60DEE87,
0xF35DA999, 0x4440689D, 0x9D662B90, 0x2A7BEA94, 0xE71DB4E0, 0x500075E4,
0x892636E9, 0x3E3BF7ED, 0x3B6BB0F3, 0x8C7671F7, 0x555032FA, 0xE24DF3FE,
0x5FF0BCC6, 0xE8ED7DC2, 0x31CB3ECF, 0x86D6FFCB, 0x8386B8D5, 0x349B79D1,
0xEDBD3ADC, 0x5AA0FBD8, 0xEEE00C69, 0x59FDCD6D, 0x80DB8E60, 0x37C64F64,
0x3296087A, 0x858BC97E, 0x5CAD8A73, 0xEBB04B77, 0x560D044F, 0xE110C54B,
0x38368646, 0x8F2B4742, 0x8A7B005C, 0x3D66C158, 0xE4408255, 0x535D4351,
0x9E3B1D25, 0x2926DC21, 0xF0009F2C, 0x471D5E28, 0x424D1936, 0xF550D832,
0x2C769B3F, 0x9B6B5A3B, 0x26D61503, 0x91CBD407, 0x48ED970A, 0xFFF0560E,
0xFAA01110, 0x4DBDD014, 0x949B9319, 0x2386521D, 0x0E562FF1, 0xB94BEEF5,
0x606DADF8, 0xD7706CFC, 0xD2202BE2, 0x653DEAE6, 0xBC1BA9EB, 0x0B0668EF,
0xB6BB27D7, 0x01A6E6D3, 0xD880A5DE, 0x6F9D64DA, 0x6ACD23C4, 0xDDD0E2C0,
0x04F6A1CD, 0xB3EB60C9, 0x7E8D3EBD, 0xC990FFB9, 0x10B6BCB4, 0xA7AB7DB0,
0xA2FB3AAE, 0x15E6FBAA, 0xCCC0B8A7, 0x7BDD79A3, 0xC660369B, 0x717DF79F,
0xA85BB492, 0x1F467596, 0x1A163288, 0xAD0BF38C, 0x742DB081, 0xC3307185,
0x99908A5D, 0x2E8D4B59, 0xF7AB0854, 0x40B6C950, 0x45E68E4E, 0xF2FB4F4A,
0x2BDD0C47, 0x9CC0CD43, 0x217D827B, 0x9660437F, 0x4F460072, 0xF85BC176,
0xFD0B8668, 0x4A16476C, 0x93300461, 0x242DC565, 0xE94B9B11, 0x5E565A15,
0x87701918, 0x306DD81C, 0x353D9F02, 0x82205E06, 0x5B061D0B, 0xEC1BDC0F,
0x51A69337, 0xE6BB5233, 0x3F9D113E, 0x8880D03A, 0x8DD09724, 0x3ACD5620,
0xE3EB152D, 0x54F6D429, 0x7926A9C5, 0xCE3B68C1, 0x171D2BCC, 0xA000EAC8,
0xA550ADD6, 0x124D6CD2, 0xCB6B2FDF, 0x7C76EEDB, 0xC1CBA1E3, 0x76D660E7,
0xAFF023EA, 0x18EDE2EE, 0x1DBDA5F0, 0xAAA064F4, 0x738627F9, 0xC49BE6FD,
0x09FDB889, 0xBEE0798D, 0x67C63A80, 0xD0DBFB84, 0xD58BBC9A, 0x62967D9E,
0xBBB03E93, 0x0CADFF97, 0xB110B0AF, 0x060D71AB, 0xDF2B32A6, 0x6836F3A2,
0x6D66B4BC, 0xDA7B75B8, 0x035D36B5, 0xB440F7B1, 0x00000001,
}
func updateIeeeCrc32(crc uint32, data []byte) uint32 {
for _, b := range data {
crc = ieeeCrc32Tbl[b^byte(crc)] ^ (crc >> 8)
}
return crc
}
type Crc32Reader struct {
R io.Reader
Crc32 uint32
}
var DebugCrc32 = false
func (self *Crc32Reader) Read(b []byte) (n int, err error) {
if n, err = self.R.Read(b); err != nil {
return
}
if DebugCrc32 {
fmt.Println("crc32: update", hex.EncodeToString(b))
}
self.Crc32 = updateIeeeCrc32(self.Crc32, b)
return
}
func (self *Crc32Reader) ReadCrc32UIntAndCheck() (err error) {
if err = ReadDummy(self, 4); err != nil {
return
}
if self.Crc32 != 0 {
err = fmt.Errorf("crc32(%x) != 0", self.Crc32)
return
}
return
}
type Crc32Writer struct {
W io.Writer
Crc32 uint32
}
func (self *Crc32Writer) Write(b []byte) (n int, err error) {
if n, err = self.W.Write(b); err != nil {
return
}
self.Crc32 = updateIeeeCrc32(self.Crc32, b)
return
}

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package ts
import (
"testing"
)
func TestChecksum(t *testing.T) {
b := []byte("hello world")
b = append(b, []byte{0xbb, 0x08, 0xec, 0x87}...)
crc := updateIeeeCrc32(0xffffffff, b)
t.Logf("%x", crc)
}

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package ts
import (
"bytes"
"encoding/hex"
"fmt"
"time"
"github.com/nareix/av"
"github.com/nareix/codec/aacparser"
"github.com/nareix/codec/h264parser"
"io"
)
type Demuxer struct {
R io.Reader
pktidx int
pkts []av.Packet
pat PAT
pmt *PMT
streams []*Stream
probed bool
}
func (self *Demuxer) Streams() (streams []av.CodecData, err error) {
if err = self.probe(); err != nil {
return
}
for _, stream := range self.streams {
streams = append(streams, stream.CodecData)
}
return
}
func (self *Demuxer) probe() (err error) {
if self.probed {
return
}
for {
if self.pmt != nil {
n := 0
for _, stream := range self.streams {
if stream.CodecData != nil {
n++
}
}
if n == len(self.streams) {
break
}
}
if err = self.poll(); err != nil {
return
}
}
self.probed = true
return
}
func (self *Demuxer) ReadPacket() (pkt av.Packet, err error) {
if err = self.probe(); err != nil {
return
}
for self.pktidx == len(self.pkts) {
if err = self.poll(); err != nil {
return
}
}
if self.pktidx < len(self.pkts) {
pkt = self.pkts[self.pktidx]
self.pktidx++
}
return
}
func (self *Demuxer) poll() (err error) {
self.pktidx = 0
self.pkts = self.pkts[0:0]
for {
if err = self.readTSPacket(); err != nil {
return
}
if len(self.pkts) > 0 {
break
}
}
return
}
func (self *Demuxer) readTSPacket() (err error) {
var header TSHeader
var n int
var data [188]byte
if header, n, err = ReadTSPacket(self.R, data[:]); err != nil {
return
}
payload := data[:n]
if header.PID == 0 {
if self.pat, err = ReadPAT(bytes.NewReader(payload)); err != nil {
return
}
} else {
if self.pmt == nil {
self.streams = []*Stream{}
for _, entry := range self.pat.Entries {
if entry.ProgramMapPID == header.PID {
self.pmt = new(PMT)
if *self.pmt, err = ReadPMT(bytes.NewReader(payload)); err != nil {
return
}
for i, info := range self.pmt.ElementaryStreamInfos {
stream := &Stream{}
stream.idx = i
stream.demuxer = self
stream.pid = info.ElementaryPID
stream.streamType = info.StreamType
switch info.StreamType {
case ElementaryStreamTypeH264:
self.streams = append(self.streams, stream)
case ElementaryStreamTypeAdtsAAC:
self.streams = append(self.streams, stream)
}
}
}
}
} else {
for _, stream := range self.streams {
if header.PID == stream.pid {
if err = stream.handleTSPacket(header, payload); err != nil {
return
}
}
}
}
}
return
}
func (self *Stream) addPacket(payload []byte, timedelta time.Duration) {
dts := self.peshdr.DTS
pts := self.peshdr.PTS
if dts == 0 {
dts = pts
}
demuxer := self.demuxer
pkt := av.Packet{
Idx: int8(self.idx),
IsKeyFrame: self.tshdr.RandomAccessIndicator,
Time: time.Duration(dts)*time.Second / time.Duration(PTS_HZ) + timedelta,
Data: payload,
}
if pts != dts {
pkt.CompositionTime = time.Duration(pts-dts)*time.Second / time.Duration(PTS_HZ)
}
demuxer.pkts = append(demuxer.pkts, pkt)
}
func (self *Stream) payloadEnd() (err error) {
payload := self.buf.Bytes()
switch self.streamType {
case ElementaryStreamTypeAdtsAAC:
var config aacparser.MPEG4AudioConfig
var packets [][]byte
var totsamples int
if config, packets, totsamples, err = aacparser.SplitADTSFrames(payload); err != nil {
err = fmt.Errorf("ts: demuxer: SplitADTSFrames failed: %s", err)
return
}
config = config.Complete()
if self.CodecData == nil {
bw := &bytes.Buffer{}
if err = aacparser.WriteMPEG4AudioConfig(bw, config); err != nil {
err = fmt.Errorf("WriteMPEG4AudioConfig failed: %s", err)
return
}
if self.CodecData, err = aacparser.NewCodecDataFromMPEG4AudioConfigBytes(bw.Bytes()); err != nil {
return
}
}
frametime := time.Duration(totsamples / len(packets)) * time.Second / time.Duration(config.SampleRate)
timedelta := time.Duration(0)
for _, packet := range packets {
self.addPacket(packet, timedelta)
timedelta += frametime
}
case ElementaryStreamTypeH264:
nalus, _ := h264parser.SplitNALUs(payload)
var sps, pps []byte
for _, nalu := range nalus {
if len(nalu) > 0 {
naltype := nalu[0] & 0x1f
switch naltype {
case 7:
sps = nalu
case 8:
pps = nalu
case 6:
case 9:
default:
if false {
fmt.Println("h264", len(nalus), "\n", hex.Dump(nalu))
}
self.addPacket(nalu, time.Duration(0))
}
}
}
if self.CodecData == nil && len(sps) > 0 && len(pps) > 0 {
if self.CodecData, err = h264parser.NewCodecDataFromSPSAndPPS(sps, pps); err != nil {
return
}
}
}
return
}
func (self *Stream) handleTSPacket(header TSHeader, tspacket []byte) (err error) {
r := bytes.NewReader(tspacket)
lr := &io.LimitedReader{R: r, N: int64(len(tspacket))}
if header.PayloadUnitStart && self.peshdr != nil && self.peshdr.DataLength == 0 {
if err = self.payloadEnd(); err != nil {
return
}
}
if header.PayloadUnitStart {
self.buf = bytes.Buffer{}
if self.peshdr, err = ReadPESHeader(lr); err != nil {
return
}
self.tshdr = header
}
if _, err = io.CopyN(&self.buf, lr, lr.N); err != nil {
return
}
if self.buf.Len() == int(self.peshdr.DataLength) {
if err = self.payloadEnd(); err != nil {
return
}
}
return
}

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The first h264 packet
00000000 00 00 00 01 09 f0 00 00 00 01 06 00 07 86 96 7f |................|
^ ^
00000010 80 00 00 40 80 00 00 01 06 05 11 03 87 f4 4e cd |...@..........N.|
^
00000020 0a 4b dc a1 94 3a c3 d4 9b 17 1f 00 80 00 00 00 |.K...:..........|
00000030 01 27 4d 40 0a a9 19 bf 2c b8 0b 50 10 10 13 0a |.'M@....,..P....|
^
00000040 d7 bd f0 10 00 00 00 01 28 fe 09 88 00 00 01 25 |........(......%|
^ ^
00000050 b8 20 20 bf ed 7e de 3b 56 7f 03 c5 d1 06 9a c3 |. ..~.;V.......|
00000060 74 e5 9d 18 e6 3f 9d 63 19 cc 46 fd 36 13 c5 b8 |t....?.c..F.6...|
00000070 7f 3e d9 39 1b 21 74 61 6d 9d b7 5b 71 e6 a2 de |.>.9.!tam..[q...|
00000080 68 0b bf 7e b8 d4 9d 2f 49 19 3b 11 6e 40 a3 0a |h..~.../I.;.n@..|
00000090 3f 02 c5 a3 47 1d ed 2a 3a a1 33 0e 15 2f 36 d8 |?...G..*:.3../6.|
000000a0 c7 2a eb c6 bf 0d 95 e4 42 3e 7b 5f 44 3f b9 a5 |.*......B>{_D?..|
000000b0 d7 a2 c6 f4 41 e8 82 b5 cc cd c9 a4 ec 29 6f 58 |....A........)oX|
000000c0 6c 78 38 7c b5 5b 27 97 9d 56 5f e0 00 00 01 25 |lx8|.['..V_....%|
^
000000d0 2b 82 02 0b af 43 64 9c f1 eb 03 7e 39 a0 b6 f8 |+....Cd....~9...|
000000e0 eb c4 88 d2 ef 79 1f 7c d6 4e 1a d3 5d 27 39 ca |.....y.|.N..]'9.|
000000f0 c6 0b a9 63 78 e2 19 41 71 d4 47 26 bc 58 e4 45 |...cx..Aq.G&.X.E|
00000100 db 77 7b 60 7f d9 e4 11 03 3d 05 0d 72 5e 0d a0 |.w{`.....=..r^..|
00000110 56 4f 1a a9 9e 4f 80 |VO...O.|
[h264 @ 0x7fdf01802200] NAL 9(AUD) at 4/279 length 1
[h264 @ 0x7fdf01802200] NAL 6(SEI) at 10/279 length 10
[h264 @ 0x7fdf01802200] NAL 6(SEI) at 24/279 length 20
[h264 @ 0x7fdf01802200] NAL 7(SPS) at 49/279 length 18
[h264 @ 0x7fdf01802200] NAL 8(PPS) at 72/279 length 3
[h264 @ 0x7fdf01802200] NAL 5(IDR) at 79/279 length 124
[h264 @ 0x7fdf01802200] NAL 5(IDR) at 207/279 length 71
AUD is a must for QuickTime player.
NAL_SLICE = 1,
NAL_DPA = 2,
NAL_DPB = 3,
NAL_DPC = 4,
NAL_IDR_SLICE = 5,
NAL_SEI = 6,
NAL_SPS = 7,
NAL_PPS = 8,
NAL_AUD = 9,
NAL_END_SEQUENCE = 10,
NAL_END_STREAM = 11,
NAL_FILLER_DATA = 12,
NAL_SPS_EXT = 13,
NAL_AUXILIARY_SLICE = 19,

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package ts
import (
"io"
"github.com/nareix/av"
"github.com/nareix/av/avutil"
)
func Handler(h *avutil.RegisterHandler) {
h.Ext = ".ts"
h.ReaderDemuxer = func(r io.Reader) av.Demuxer {
return &Demuxer{R: r}
}
h.WriterMuxer = func(w io.Writer) av.Muxer {
return &Muxer{W: w}
}
}

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package ts
import (
"bytes"
"fmt"
"github.com/nareix/av"
"github.com/nareix/codec/aacparser"
"github.com/nareix/codec/h264parser"
"io"
)
type Muxer struct {
W io.Writer
streams []*Stream
PaddingToMakeCounterCont bool
tswPAT *TSWriter
tswPMT *TSWriter
}
func (self *Muxer) isCodecSupported(codec av.CodecData) bool {
switch codec.Type() {
case av.H264, av.AAC:
return true
default:
return false
}
}
func (self *Muxer) newStream(codec av.CodecData) (err error) {
if !self.isCodecSupported(codec) {
err = fmt.Errorf("codec type=%x is not supported", codec.Type())
return
}
stream := &Stream{
muxer: self,
CodecData: codec,
tsw: &TSWriter{
DiscontinuityIndicator: true,
PID: uint(len(self.streams) + 0x100),
},
}
self.streams = append(self.streams, stream)
return
}
func (self *Muxer) writePaddingTSPackets(tsw *TSWriter) (err error) {
for tsw.ContinuityCounter&0xf != 0x0 {
header := TSHeader{
PID: tsw.PID,
ContinuityCounter: tsw.ContinuityCounter,
}
if _, err = WriteTSHeader(self.W, header, 0); err != nil {
return
}
tsw.ContinuityCounter++
}
return
}
func (self *Muxer) WriteTrailer() (err error) {
if self.PaddingToMakeCounterCont {
for _, stream := range self.streams {
if err = self.writePaddingTSPackets(stream.tsw); err != nil {
return
}
}
}
return
}
func (self *Muxer) WritePATPMT() (err error) {
bufPAT := &bytes.Buffer{}
bufPMT := &bytes.Buffer{}
pat := PAT{
Entries: []PATEntry{
{ProgramNumber: 1, ProgramMapPID: 0x1000},
},
}
WritePAT(bufPAT, pat)
var elemStreams []ElementaryStreamInfo
for _, stream := range self.streams {
switch stream.Type() {
case av.AAC:
elemStreams = append(elemStreams, ElementaryStreamInfo{StreamType: ElementaryStreamTypeAdtsAAC, ElementaryPID: stream.tsw.PID})
case av.H264:
elemStreams = append(elemStreams, ElementaryStreamInfo{StreamType: ElementaryStreamTypeH264, ElementaryPID: stream.tsw.PID})
}
}
pmt := PMT{
PCRPID: 0x100,
ElementaryStreamInfos: elemStreams,
}
WritePMT(bufPMT, pmt)
self.tswPMT = &TSWriter{
PID: 0x1000,
DiscontinuityIndicator: true,
}
self.tswPAT = &TSWriter{
PID: 0,
DiscontinuityIndicator: true,
}
if err = self.tswPAT.WriteTo(self.W, bufPAT.Bytes()); err != nil {
return
}
if err = self.tswPMT.WriteTo(self.W, bufPMT.Bytes()); err != nil {
return
}
return
}
func (self *Muxer) WriteHeader(streams []av.CodecData) (err error) {
self.streams = []*Stream{}
for _, stream := range streams {
if err = self.newStream(stream); err != nil {
return
}
}
if err = self.WritePATPMT(); err != nil {
return
}
return
}
func (self *Muxer) WritePacket(pkt av.Packet) (err error) {
if false {
fmt.Println("ts:", "in", pkt.Idx, pkt.Time, "len", len(pkt.Data))
}
if err = self.writePacket(pkt); err != nil {
return
}
return
}
func (self *Muxer) writePacket(pkt av.Packet) (err error) {
stream := self.streams[pkt.Idx]
switch stream.Type() {
case av.AAC:
codec := stream.CodecData.(aacparser.CodecData)
data := pkt.Data
data = append(codec.MakeADTSHeader(1024, len(data)), data...)
buf := &bytes.Buffer{}
pes := PESHeader{
StreamId: StreamIdAAC,
PTS: timeToPesTs(pkt.Time),
}
WritePESHeader(buf, pes, len(data))
buf.Write(data)
stream.tsw.RandomAccessIndicator = true
stream.tsw.PCR = timeToPCR(pkt.Time)
if err = stream.tsw.WriteTo(self.W, buf.Bytes()); err != nil {
return
}
case av.H264:
codec := stream.CodecData.(h264parser.CodecData)
buf := &bytes.Buffer{}
pes := PESHeader{
StreamId: StreamIdH264,
PTS: timeToPesTs(pkt.Time + pkt.CompositionTime),
DTS: timeToPesTs(pkt.Time),
}
WritePESHeader(buf, pes, 0)
if typ := h264parser.CheckNALUsType(pkt.Data); typ != h264parser.NALU_RAW {
err = fmt.Errorf("ts: h264 nalu format=%d invalid", typ)
return
}
nalus := [][]byte{}
if pkt.IsKeyFrame {
nalus = append([][]byte{codec.SPS(), codec.PPS()})
}
nalus = append(nalus, pkt.Data)
h264parser.WalkNALUsAnnexb(nalus, func(b []byte) {
buf.Write(b)
})
stream.tsw.RandomAccessIndicator = pkt.IsKeyFrame
stream.tsw.PCR = timeToPCR(pkt.Time)
if err = stream.tsw.WriteTo(self.W, buf.Bytes()); err != nil {
return
}
}
return
}

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package ts
import (
"fmt"
"io"
"io/ioutil"
)
func ReadUInt(r io.Reader, n int) (res uint, err error) {
var b [4]byte
if _, err = r.Read(b[0:n]); err != nil {
return
}
for i := 0; i < n; i++ {
res <<= 8
res |= uint(b[i])
}
return
}
func ReadDummy(r io.Reader, n int) (err error) {
_, err = io.CopyN(ioutil.Discard, r, int64(n))
return
}
func ReadUInt64(r io.Reader, n int) (res uint64, err error) {
var res32 uint
if n > 4 {
if res32, err = ReadUInt(r, n-4); err != nil {
return
}
res |= uint64(res32) << 32
n = 4
}
if res32, err = ReadUInt(r, n); err != nil {
return
}
res |= uint64(res32)
return
}
func ReadTSHeader(r io.Reader) (self TSHeader, err error) {
var flags uint
// sync(8)
// transport_error_indicator(1)
// payload_unit_start_indicator(1)
// transport_priority(1)
// pid(13)
// Scrambling control(2)
// Adaptation field flag(1)
// Continuity counter(4)
if flags, err = ReadUInt(r, 4); err != nil {
return
}
if DebugReader {
fmt.Fprintf(DebugOutput, "ts: flags %s\n", FieldsDumper{
Fields: []struct {
Length int
Desc string
}{
{8, "sync"},
{1, "transport_error_indicator"},
{1, "payload_unit_start_indicator"},
{1, "transport_priority"},
{13, "pid"},
{2, "scrambling_control"},
{1, "adaptation_field_flag"},
{1, "payload_flag"},
{4, "continuity_counter"},
},
Val: flags,
Length: 32,
})
}
if flags&0x400000 != 0 {
// When set to '1' it indicates that this TS packet contains the first PES packet.
self.PayloadUnitStart = true
}
if (flags&0xff000000)>>24 != 0x47 {
err = fmt.Errorf("invalid sync")
return
}
self.PID = (flags & 0x1fff00) >> 8
self.ContinuityCounter = flags & 0xf
if flags&0x20 != 0 {
var flags, length uint
if length, err = ReadUInt(r, 1); err != nil {
return
}
if length > 0 {
lr := &io.LimitedReader{R: r, N: int64(length)}
if flags, err = ReadUInt(lr, 1); err != nil {
return
}
if DebugReader {
fmt.Fprintf(DebugOutput, "ts: ext_flags %s\n", FieldsDumper{
Fields: []struct {
Length int
Desc string
}{
{1, "discontinuity_indicator"},
{1, "random_access_indicator"},
{1, "elementary_stream_priority_indicator"},
{1, "pcr_flag"},
{1, "opcr_flag"},
{1, "splicing_point_flag"},
{1, "transport_private_data_flag"},
{1, "adaptation_field_extension_flag"},
},
Val: flags,
Length: 8,
})
}
// random_access_indicator
if flags&0x40 != 0 {
self.RandomAccessIndicator = true
}
// PCR
if flags&0x10 != 0 {
var v uint64
if v, err = ReadUInt64(lr, 6); err != nil {
return
}
// clock is 27MHz
self.PCR = UIntToPCR(v)
if DebugReader {
fmt.Fprintf(DebugOutput, "ts: PCR %d %f\n", self.PCR, float32(self.PCR)/PCR_HZ)
}
}
// OPCR
if flags&0x08 != 0 {
var v uint64
if v, err = ReadUInt64(lr, 6); err != nil {
return
}
self.OPCR = UIntToPCR(v)
}
// Splice countdown
if flags&0x04 != 0 {
if _, err = ReadUInt(lr, 1); err != nil {
return
}
}
// Transport private data
if flags&0x02 != 0 {
var length uint
if length, err = ReadUInt(lr, 1); err != nil {
return
}
b := make([]byte, length)
if _, err = lr.Read(b); err != nil {
return
}
}
// Adaptation extension
if lr.N > 0 {
if DebugReader {
// rubish
fmt.Fprintln(DebugOutput, "ts: skip", lr.N)
}
if err = ReadDummy(lr, int(lr.N)); err != nil {
return
}
}
}
}
return
}
func ReadTSPacket(r io.Reader, data []byte) (self TSHeader, n int, err error) {
lr := &io.LimitedReader{R: r, N: 188}
if self, err = ReadTSHeader(lr); err != nil {
return
}
if DebugReader {
fmt.Fprintln(DebugOutput, "ts: data len", lr.N)
}
if n, err = lr.Read(data[:lr.N]); err != nil {
return
}
return
}
func ReadPSI(r io.Reader) (self PSI, lr *io.LimitedReader, cr *Crc32Reader, err error) {
var flags, pointer, length uint
// pointer field
if pointer, err = ReadUInt(r, 1); err != nil {
return
}
if DebugReader {
fmt.Fprintf(DebugOutput, "psi: pointer=%d\n", pointer)
}
if pointer != 0 {
if err = ReadDummy(r, int(pointer)); err != nil {
return
}
}
cr = &Crc32Reader{R: r, Crc32: 0xffffffff}
// table_id
if self.TableId, err = ReadUInt(cr, 1); err != nil {
return
}
// reserved(4)=0xb
// section_length(10)
if flags, err = ReadUInt(cr, 2); err != nil {
return
}
length = flags & 0x3FF
if DebugReader {
fmt.Fprintf(DebugOutput, "psi: tableid=%d len=%d\n", self.TableId, length)
}
lr = &io.LimitedReader{R: cr, N: int64(length)}
// Table ID extension(16)
if self.TableIdExtension, err = ReadUInt(lr, 2); err != nil {
return
}
// resverd(2)=3
// version(5)
// Current_next_indicator(1)
if flags, err = ReadUInt(lr, 1); err != nil {
return
}
if DebugReader {
fmt.Fprintf(DebugOutput, "psi: %s\n", FieldsDumper{
Fields: []struct {
Length int
Desc string
}{
{2, "resverd"},
{5, "version"},
{1, "current_next_indicator"},
},
Val: flags,
Length: 8,
})
}
// section_number(8)
if self.SecNum, err = ReadUInt(lr, 1); err != nil {
return
}
// last_section_number(8)
if self.LastSecNum, err = ReadUInt(lr, 1); err != nil {
return
}
if DebugReader {
fmt.Fprintf(DebugOutput, "psi: table_id=%x table_extension=%x secnum=%x lastsecnum=%x\n",
self.TableId,
self.TableIdExtension,
self.SecNum,
self.LastSecNum,
)
}
lr.N -= 4
return
}
func ReadPMT(r io.Reader) (self PMT, err error) {
readDescs := func(lr *io.LimitedReader) (res []Descriptor, err error) {
var desc Descriptor
for lr.N > 0 {
if desc.Tag, err = ReadUInt(lr, 1); err != nil {
return
}
var length uint
if length, err = ReadUInt(lr, 1); err != nil {
return
}
desc.Data = make([]byte, length)
if _, err = lr.Read(desc.Data); err != nil {
return
}
res = append(res, desc)
}
return
}
var lr *io.LimitedReader
var cr *Crc32Reader
//var psi PSI
if _, lr, cr, err = ReadPSI(r); err != nil {
return
}
var flags, length uint
// 111(3)
// PCRPID(13)
if flags, err = ReadUInt(lr, 2); err != nil {
return
}
self.PCRPID = flags & 0x1fff
if DebugReader {
fmt.Fprintf(DebugOutput, "pmt: %s\n", FieldsDumper{
Fields: []struct {
Length int
Desc string
}{
{3, "reserved"},
{13, "pcrpid"},
},
Val: flags,
Length: 16,
})
}
// Reserved(4)=0xf
// Reserved(2)=0x0
// Program info length(10)
if flags, err = ReadUInt(lr, 2); err != nil {
return
}
length = flags & 0x3ff
if DebugReader {
fmt.Fprintf(DebugOutput, "pmt: ProgramDescriptorsLen=%d\n", length)
}
if length > 0 {
lr := &io.LimitedReader{R: lr, N: int64(length)}
if self.ProgramDescriptors, err = readDescs(lr); err != nil {
return
}
}
for lr.N > 0 {
var info ElementaryStreamInfo
if info.StreamType, err = ReadUInt(lr, 1); err != nil {
return
}
// Reserved(3)
// Elementary PID(13)
if flags, err = ReadUInt(lr, 2); err != nil {
return
}
info.ElementaryPID = flags & 0x1fff
if DebugReader {
fmt.Fprintf(DebugOutput, "pmt: info1 %s\n", FieldsDumper{
Fields: []struct {
Length int
Desc string
}{
{3, "reserved"},
{13, "elementary_pid"},
},
Val: flags,
Length: 16,
})
}
// Reserved(6)
// ES Info length(10)
if flags, err = ReadUInt(lr, 2); err != nil {
return
}
length = flags & 0x3ff
if DebugReader {
fmt.Fprintf(DebugOutput, "pmt: info2 %s\n", FieldsDumper{
Fields: []struct {
Length int
Desc string
}{
{6, "reserved"},
{10, "es_info_length"},
},
Val: flags,
Length: 16,
})
}
if length > 0 {
lr := &io.LimitedReader{R: lr, N: int64(length)}
if info.Descriptors, err = readDescs(lr); err != nil {
return
}
}
self.ElementaryStreamInfos = append(self.ElementaryStreamInfos, info)
}
if DebugReader {
fmt.Fprintf(DebugOutput, "pmt: ProgramDescriptors %v\n", self.ProgramDescriptors)
fmt.Fprintf(DebugOutput, "pmt: ElementaryStreamInfos %v\n", self.ElementaryStreamInfos)
}
if err = cr.ReadCrc32UIntAndCheck(); err != nil {
if DebugReader {
fmt.Fprintf(DebugOutput, "pmt: %s\n", err)
}
return
}
return
}
func ReadPAT(r io.Reader) (self PAT, err error) {
var lr *io.LimitedReader
var cr *Crc32Reader
//var psi PSI
if _, lr, cr, err = ReadPSI(r); err != nil {
return
}
for lr.N > 0 {
entry := PATEntry{}
if entry.ProgramNumber, err = ReadUInt(lr, 2); err != nil {
return
}
if entry.ProgramNumber == 0 {
if entry.NetworkPID, err = ReadUInt(lr, 2); err != nil {
return
}
entry.NetworkPID &= 0x1fff
} else {
if entry.ProgramMapPID, err = ReadUInt(lr, 2); err != nil {
return
}
entry.ProgramMapPID &= 0x1fff
}
self.Entries = append(self.Entries, entry)
}
if err = cr.ReadCrc32UIntAndCheck(); err != nil {
if DebugReader {
fmt.Fprintf(DebugOutput, "pat: %s\n", err)
}
return
}
if DebugReader {
fmt.Fprintf(DebugOutput, "pat: %v\n", self)
}
return
}
func ReadPESHeader(r io.Reader) (res *PESHeader, err error) {
var flags, length uint
self := &PESHeader{}
// http://dvd.sourceforge.net/dvdinfo/pes-hdr.html
// start code 000001
if flags, err = ReadUInt(r, 3); err != nil {
return
}
if flags != 0x000001 {
err = fmt.Errorf("invalid PES header")
return
}
if self.StreamId, err = ReadUInt(r, 1); err != nil {
return
}
if length, err = ReadUInt(r, 2); err != nil {
return
}
if DebugReader {
fmt.Fprintf(DebugOutput, "pes: StreamId=%x length=%d\n", self.StreamId, length)
}
if length == 0 {
length = 1 << 31
}
lrAll := &io.LimitedReader{R: r, N: int64(length)}
lr := lrAll
// 10(2)
// PES scrambling control(2)
// PES priority(1)
// data alignment indicator(1)
// copyright(1)
// original or copy(1)
if _, err = ReadUInt(lr, 1); err != nil {
return
}
if DebugReader {
fmt.Fprintf(DebugOutput, "pes: %s\n", FieldsDumper{
Fields: []struct {
Length int
Desc string
}{
{2, "scrambling_control"},
{1, "priority"},
{1, "data_alignment_indicator"},
{1, "copyright"},
{1, "original_or_copy"},
},
Val: flags,
Length: 6,
})
}
// PTS DTS flags(2)
// ESCR flag(1)
// ES rate flag(1)
// DSM trick mode flag(1)
// additional copy info flag(1)
// PES CRC flag(1)
// PES extension flag(1)
if flags, err = ReadUInt(lr, 1); err != nil {
return
}
if DebugReader {
fmt.Fprintf(DebugOutput, "pes: %s\n", FieldsDumper{
Fields: []struct {
Length int
Desc string
}{
{2, "pts_dts_flags"},
{1, "escr_flag"},
{1, "es_rate_flag"},
{1, "dsm_trick_mode_flag"},
{1, "additional_copy_info_flag"},
{1, "pes_crc_flag"},
{1, "pes_extension_flag"},
},
Val: flags,
Length: 8,
})
}
// PES header data length(8)
if length, err = ReadUInt(lr, 1); err != nil {
return
}
lr = &io.LimitedReader{R: lr, N: int64(length)}
if flags&0x80 != 0 {
var v uint64
if v, err = ReadUInt64(lr, 5); err != nil {
return
}
self.PTS = PESUIntToTs(v)
if DebugReader {
fmt.Fprintf(DebugOutput, "pes: pts %d %f\n", self.PTS, float32(self.PTS)/float32(PTS_HZ))
}
}
if flags&0x40 != 0 && flags&0x80 != 0 {
var v uint64
if v, err = ReadUInt64(lr, 5); err != nil {
return
}
self.DTS = PESUIntToTs(v)
if DebugReader {
fmt.Fprintf(DebugOutput, "pes: dts %d %f\n", self.DTS, float32(self.DTS)/float32(PTS_HZ))
}
}
// ESCR flag
if flags&0x20 != 0 {
if _, err = ReadUInt64(lr, 6); err != nil {
return
}
}
// ES rate flag
if flags&0x10 != 0 {
if _, err = ReadUInt64(lr, 3); err != nil {
return
}
}
// additional copy info flag
if flags&0x04 != 0 {
if _, err = ReadUInt(lr, 1); err != nil {
return
}
}
// PES CRC flag
if flags&0x02 != 0 {
if _, err = ReadUInt(lr, 2); err != nil {
return
}
}
// PES extension flag
if flags&0x01 != 0 {
var flags uint
// PES private data flag(1)
// pack header field flag(1)
// program packet sequence counter flag(1)
// P-STD buffer flag(1)
// 111(3)
// PES extension flag 2(1)
if flags, err = ReadUInt(lr, 1); err != nil {
return
}
// PES private data flag(1)
if flags&0x80 != 0 {
// if set to 1 16 bytes of user defined data is appended to the header data field
if err = ReadDummy(lr, 16); err != nil {
return
}
}
// pack header field flag(1)
if flags&0x40 != 0 {
// if set to 1 the 8-bit pack field length value is appended to the header data field
if err = ReadDummy(lr, 1); err != nil {
return
}
}
// program packet sequence counter flag(1)
if flags&0x20 != 0 {
if err = ReadDummy(lr, 2); err != nil {
return
}
}
// P-STD buffer flag(1)
if flags&0x10 != 0 {
if err = ReadDummy(lr, 2); err != nil {
return
}
}
// PES extension flag 2(1)
if flags&0x01 != 0 {
if err = ReadDummy(lr, 2); err != nil {
return
}
}
}
if lr.N > 0 {
if err = ReadDummy(lr, int(lr.N)); err != nil {
return
}
}
if lrAll.N < 65536 {
self.DataLength = uint(lrAll.N)
}
res = self
return
}

36
ts/stream.go Normal file
View File

@ -0,0 +1,36 @@
package ts
import (
"time"
"bytes"
"github.com/nareix/av"
)
type Stream struct {
av.CodecData
pid uint
buf bytes.Buffer
peshdr *PESHeader
tshdr TSHeader
demuxer *Demuxer
muxer *Muxer
streamId uint
streamType uint
tsw *TSWriter
dataBuf *iovec
cacheSize int
idx int
}
func timeToPesTs(tm time.Duration) uint64 {
return uint64(tm*PTS_HZ/time.Second) + PTS_HZ
}
func timeToPCR(tm time.Duration) uint64 {
return uint64(tm*PCR_HZ/time.Second) + PCR_HZ
}

122
ts/ts.go Normal file
View File

@ -0,0 +1,122 @@
package ts
import (
"fmt"
"os"
)
const (
ElementaryStreamTypeH264 = 0x1B
ElementaryStreamTypeAdtsAAC = 0x0F
)
type TSHeader struct {
PID uint
PCR uint64
OPCR uint64
ContinuityCounter uint
PayloadUnitStart bool
DiscontinuityIndicator bool
RandomAccessIndicator bool
HeaderLength uint
}
type PATEntry struct {
ProgramNumber uint
NetworkPID uint
ProgramMapPID uint
}
type PAT struct {
Entries []PATEntry
}
type PMT struct {
PCRPID uint
ProgramDescriptors []Descriptor
ElementaryStreamInfos []ElementaryStreamInfo
}
type Descriptor struct {
Tag uint
Data []byte
}
type ElementaryStreamInfo struct {
StreamType uint
ElementaryPID uint
Descriptors []Descriptor
}
type PSI struct {
TableIdExtension uint
TableId uint
SecNum uint
LastSecNum uint
}
const (
StreamIdH264 = 0xe0
StreamIdAAC = 0xc0
)
type PESHeader struct {
StreamId uint // H264=0xe0 AAC=0xc0
DataLength uint
PTS uint64
DTS uint64
ESCR uint64
}
func PESUIntToTs(v uint64) (ts uint64) {
// 0010 PTS 32..30 1 PTS 29..15 1 PTS 14..00 1
return (((v >> 33) & 0x7) << 30) | (((v >> 17) & 0x7fff) << 15) | ((v >> 1) & 0x7fff)
}
func PESTsToUInt(ts uint64) (v uint64) {
// 0010 PTS 32..30 1 PTS 29..15 1 PTS 14..00 1
return ((ts>>30)&0x7)<<33 | ((ts>>15)&0x7fff)<<17 | (ts&0x7fff)<<1 | 0x100010001
}
const (
PTS_HZ = 90000
PCR_HZ = 27000000
)
func UIntToPCR(v uint64) uint64 {
// base(33)+resverd(6)+ext(9)
base := v >> 15
ext := v & 0x1ff
return base*300 + ext
}
func PCRToUInt(pcr uint64) uint64 {
base := pcr / 300
ext := pcr % 300
return base<<15 | 0x3f<<9 | ext
}
var DebugOutput = os.Stdout
var DebugReader = false
var DebugWriter = false
type FieldsDumper struct {
Fields []struct {
Length int
Desc string
}
Val uint
Length uint
}
func (self FieldsDumper) String() (res string) {
pos := uint(self.Length)
for _, field := range self.Fields {
pos -= uint(field.Length)
val := (self.Val >> pos) & (1<<uint(field.Length) - 1)
if val != 0 {
res += fmt.Sprintf("%s=%x ", field.Desc, val)
}
}
return
}

9
ts/ts_test.go Normal file
View File

@ -0,0 +1,9 @@
package ts
import (
"testing"
)
func TestPESTsConv(t *testing.T) {
t.Logf("%x", PESTsToUInt(0x123))
}

135
ts/vecio.go Normal file
View File

@ -0,0 +1,135 @@
package ts
import (
"fmt"
"io"
"net"
"os"
"syscall"
"unsafe"
)
type iovec struct {
data [][]byte
Len int
pos int
idx int
}
func (self *iovec) Prepend(b []byte) {
self.data = append([][]byte{b}, self.data...)
self.Len += len(b)
}
func (self *iovec) Append(b []byte) {
self.data = append(self.data, b)
self.Len += len(b)
}
func (self *iovec) WriteTo(w io.Writer, n int) (written int, err error) {
for n > 0 && self.Len > 0 {
data := self.data[self.idx]
var b []byte
if n > len(data) {
b = data
} else {
b = data[:n]
}
data = data[len(b):]
if len(data) == 0 {
self.idx++
} else {
self.data[self.idx] = data
}
self.Len -= len(b)
n -= len(b)
written += len(b)
if _, err = w.Write(b); err != nil {
return
}
}
return
}
type sysiovec struct {
Base uintptr
Len uint64
}
type vecWriter struct {
fd uintptr
smallBytesBuf []byte
iov []sysiovec
}
func (self *vecWriter) Write(p []byte) (written int, err error) {
iov := sysiovec{
Len: uint64(len(p)),
}
if len(p) < 16 {
iov.Base = uintptr(len(self.smallBytesBuf))
self.smallBytesBuf = append(self.smallBytesBuf, p...)
} else {
iov.Base = uintptr(unsafe.Pointer(&p[0]))
}
self.iov = append(self.iov, iov)
return
}
func (self *vecWriter) Flush() (err error) {
for i := range self.iov {
iov := &self.iov[i]
if iov.Base < uintptr(len(self.smallBytesBuf)) {
iov.Base = uintptr(unsafe.Pointer(&self.smallBytesBuf[iov.Base]))
}
}
N := 1024
for i := 0; i < len(self.iov); i += N {
n := len(self.iov) - i
if n > N {
n = N
}
_, _, errno := syscall.Syscall(syscall.SYS_WRITEV, self.fd, uintptr(unsafe.Pointer(&self.iov[i])), uintptr(n))
if errno != 0 {
err = fmt.Errorf("writev failed with error: %d", errno)
return
}
}
if DebugWriter {
fmt.Printf("vecw: smallBytesBuf=%d iovNr=%d\n", len(self.smallBytesBuf), len(self.iov))
}
self.iov = self.iov[:0]
self.smallBytesBuf = self.smallBytesBuf[:0]
return
}
func newVecWriter(w io.Writer) (vecw *vecWriter) {
var err error
var f *os.File
switch obj := w.(type) {
case *net.TCPConn:
f, err = obj.File()
if err != nil {
return
}
case *os.File:
f = obj
default:
return
}
vecw = &vecWriter{
fd: f.Fd(),
}
return
}

556
ts/writer.go Normal file
View File

@ -0,0 +1,556 @@
package ts
import (
"bytes"
"fmt"
"io"
)
func WriteUInt64(w io.Writer, val uint64, n int) (err error) {
var b [8]byte
for i := n - 1; i >= 0; i-- {
b[i] = byte(val)
val >>= 8
}
if _, err = w.Write(b[:n]); err != nil {
return
}
return
}
func WriteUInt(w io.Writer, val uint, n int) (err error) {
return WriteUInt64(w, uint64(val), n)
}
func makeRepeatValBytes(val byte, n int) []byte {
b := make([]byte, n)
for i := range b {
b[i] = val
}
return b
}
func WriteRepeatVal(w io.Writer, val byte, n int) (err error) {
_, err = w.Write(makeRepeatValBytes(val, n))
return
}
func WriteTSHeader(w io.Writer, self TSHeader, dataLength int) (written int, err error) {
var flags, extFlags uint
// sync(8)
// transport_error_indicator(1)
// payload_unit_start_indicator(1)
// transport_priority(1)
// pid(13)
// Scrambling control(2)
// Adaptation field flag(1) 0x20
// Payload flag(1) 0x10
// Continuity counter(4)
flags = 0x47 << 24
flags |= 0x10
if self.PayloadUnitStart {
flags |= 0x400000
}
flags |= (self.PID & 0x1fff) << 8
flags |= self.ContinuityCounter & 0xf
if DebugWriter {
fmt.Fprintf(DebugOutput, "tsw: pid=%x\n", self.PID)
}
const PCR = 0x10
const OPCR = 0x08
const EXT = 0x20
if self.PCR != 0 {
extFlags |= PCR
}
if self.OPCR != 0 {
extFlags |= OPCR
}
if self.RandomAccessIndicator {
extFlags |= 0x40
}
if self.DiscontinuityIndicator {
extFlags |= 0x80
}
if extFlags != 0 {
flags |= EXT
}
// need padding
if dataLength < 184 {
flags |= EXT
}
if err = WriteUInt(w, flags, 4); err != nil {
return
}
written += 4
if flags&EXT != 0 {
var length uint
// Discontinuity indicator 1 0x80
// Random Access indicator 1 0x40
// Elementary stream priority indicator 1 0x20
// PCR flag 1 0x10
// OPCR flag 1 0x08
length = 1 // extFlags
if extFlags&PCR != 0 {
length += 6
}
if extFlags&OPCR != 0 {
length += 6
}
paddingLength := 0
// need padding
if int(length)+5+dataLength < 188 {
paddingLength = 188 - dataLength - 5 - int(length)
length = 188 - uint(dataLength) - 5
}
if DebugWriter {
fmt.Fprintf(DebugOutput, "tsw: header padding=%d\n", paddingLength)
}
if err = WriteUInt(w, length, 1); err != nil {
return
}
if err = WriteUInt(w, extFlags, 1); err != nil {
return
}
if extFlags&PCR != 0 {
if err = WriteUInt64(w, PCRToUInt(self.PCR), 6); err != nil {
return
}
}
if extFlags&OPCR != 0 {
if err = WriteUInt64(w, PCRToUInt(self.OPCR), 6); err != nil {
return
}
}
if paddingLength > 0 {
if err = WriteRepeatVal(w, 0xff, paddingLength); err != nil {
return
}
}
written += int(length) + 1
}
return
}
type TSWriter struct {
W io.Writer
PID uint
TSHeader
DisableHeaderPadding bool
DiscontinuityIndicator bool
vecw *vecWriter
}
func (self *TSWriter) EnableVecWriter() {
if self.vecw == nil {
self.vecw = newVecWriter(self.W)
if DebugWriter && self.vecw != nil {
fmt.Fprintln(DebugOutput, "tsw: enabled vec writer")
}
}
}
func (self *TSWriter) WriteIovec(data *iovec) (err error) {
if self.vecw != nil {
if err = self.WriteIovecTo(self.vecw, data); err != nil {
return
}
if err = self.vecw.Flush(); err != nil {
return
}
} else {
if err = self.WriteIovecTo(self.W, data); err != nil {
return
}
}
return
}
func (self *TSWriter) WriteIovecTo(w io.Writer, data *iovec) (err error) {
for i := 0; data.Len > 0; i++ {
header := TSHeader{
PID: self.PID,
ContinuityCounter: self.ContinuityCounter,
DiscontinuityIndicator: self.DiscontinuityIndicator,
}
if i == 0 {
header.PayloadUnitStart = true
header.RandomAccessIndicator = self.RandomAccessIndicator
header.PCR = self.PCR
header.OPCR = self.OPCR
}
requestLength := data.Len
if self.DisableHeaderPadding {
requestLength = 188
}
var headerLength int
if headerLength, err = WriteTSHeader(w, header, requestLength); err != nil {
return
}
payloadLength := 188 - headerLength
if self.DisableHeaderPadding && data.Len < payloadLength {
data.Append(makeRepeatValBytes(0xff, payloadLength-data.Len))
}
if DebugWriter {
fmt.Fprintf(DebugOutput, "tsw: payloadLength=%d dataLength=%d\n", payloadLength, data.Len)
}
if _, err = data.WriteTo(w, payloadLength); err != nil {
return
}
self.ContinuityCounter++
}
return
}
func (self *TSWriter) WriteTo(w io.Writer, data []byte) (err error) {
iov := &iovec{}
iov.Append(data)
return self.WriteIovecTo(w, iov)
}
func (self *TSWriter) Write(data []byte) (err error) {
iov := &iovec{}
iov.Append(data)
return self.WriteIovec(iov)
}
func WritePSI(w io.Writer, self PSI, data []byte) (err error) {
// pointer(8)
// table_id(8)
// reserved(4)=0xb,section_length(10)
// Table ID extension(16)
// section_syntax_indicator(1)=1,private_bit(1)=1,reserved(2)=3,unused(2)=0,section_length(10)
// section_number(8)
// last_section_number(8)
// data
// crc(32)
// pointer(8)
if err = WriteUInt(w, 0, 1); err != nil {
return
}
cw := &Crc32Writer{W: w, Crc32: 0xffffffff}
// table_id(8)
if err = WriteUInt(cw, self.TableId, 1); err != nil {
return
}
// section_syntax_indicator(1)=1,private_bit(1)=0,reserved(2)=3,unused(2)=0,section_length(10)
var flags, length uint
length = 2 + 3 + 4 + uint(len(data))
flags = 0xa<<12 | length
if err = WriteUInt(cw, flags, 2); err != nil {
return
}
if DebugWriter {
fmt.Fprintf(DebugOutput, "psiw: length=%d\n", length)
}
// Table ID extension(16)
if err = WriteUInt(cw, self.TableIdExtension, 2); err != nil {
return
}
// resverd(2)=3,version(5)=0,Current_next_indicator(1)=1
flags = 0x3<<6 | 1
if err = WriteUInt(cw, flags, 1); err != nil {
return
}
// section_number(8)
if err = WriteUInt(cw, self.SecNum, 1); err != nil {
return
}
// last_section_number(8)
if err = WriteUInt(cw, self.LastSecNum, 1); err != nil {
return
}
// data
if _, err = cw.Write(data); err != nil {
return
}
// crc(32)
if err = WriteUInt(w, bswap32(uint(cw.Crc32)), 4); err != nil {
return
}
return
}
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, dataLength int) (err error) {
// http://dvd.sourceforge.net/dvdinfo/pes-hdr.html
var pts_dts_flags, header_length, packet_length uint
// start code(24) 000001
// StreamId(8)
// packet_length(16)
// resverd(6,2)=2,original_or_copy(0,1)=1
// pts_dts_flags(6,2)
// header_length(8)
// pts(40)?
// dts(40)?
// data
// start code(24) 000001
if err = WriteUInt(w, 0x000001, 3); err != nil {
return
}
// StreamId(8)
if err = WriteUInt(w, self.StreamId, 1); err != nil {
return
}
const PTS = 1 << 7
const DTS = 1 << 6
if self.PTS != 0 {
pts_dts_flags |= PTS
if self.DTS != 0 {
pts_dts_flags |= DTS
}
}
if pts_dts_flags&PTS != 0 {
header_length += 5
}
if pts_dts_flags&DTS != 0 {
header_length += 5
}
if dataLength > 0 {
packet_length = uint(dataLength) + header_length + 3
}
// packet_length(16) if zero then variable length
// 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
}
// resverd(6,2)=2,original_or_copy(0,1)=1
if err = WriteUInt(w, 2<<6|1, 1); err != nil {
return
}
// pts_dts_flags(6,2)
if err = WriteUInt(w, pts_dts_flags, 1); err != nil {
return
}
// header_length(8)
if err = WriteUInt(w, header_length, 1); err != nil {
return
}
// pts(40)?
// dts(40)?
if pts_dts_flags&PTS != 0 {
if pts_dts_flags&DTS != 0 {
if err = WriteUInt64(w, PESTsToUInt(self.PTS)|3<<36, 5); err != nil {
return
}
if err = WriteUInt64(w, PESTsToUInt(self.DTS)|1<<36, 5); err != nil {
return
}
} else {
if err = WriteUInt64(w, PESTsToUInt(self.PTS)|2<<36, 5); err != nil {
return
}
}
}
return
}
func WritePESPacket(w *TSWriter, header PESHeader, data []byte) (err error) {
bw := &bytes.Buffer{}
if err = WritePESHeader(bw, header, len(data)); err != nil {
return
}
iov := &iovec{}
iov.Append(bw.Bytes())
iov.Append(data)
if err = w.WriteIovec(iov); err != nil {
return
}
return
}
func WritePAT(w io.Writer, self PAT) (err error) {
bw := &bytes.Buffer{}
for _, entry := range self.Entries {
if err = WriteUInt(bw, entry.ProgramNumber, 2); err != nil {
return
}
if entry.ProgramNumber == 0 {
if err = WriteUInt(bw, entry.NetworkPID&0x1fff|7<<13, 2); err != nil {
return
}
} else {
if err = WriteUInt(bw, entry.ProgramMapPID&0x1fff|7<<13, 2); err != nil {
return
}
}
}
psi := PSI{
TableIdExtension: 1,
}
if err = WritePSI(w, psi, bw.Bytes()); err != nil {
return
}
return
}
func WritePATPacket(w io.Writer, pat PAT) (err error) {
tsw := &TSWriter{
W: w,
PID: 0,
DisableHeaderPadding: true,
}
bw := &bytes.Buffer{}
if err = WritePAT(bw, pat); err != nil {
return
}
if err = tsw.Write(bw.Bytes()); err != nil {
return
}
return
}
func WritePMT(w io.Writer, self PMT) (err error) {
writeDescs := func(w io.Writer, descs []Descriptor) (err error) {
for _, desc := range descs {
if err = WriteUInt(w, desc.Tag, 1); err != nil {
return
}
if err = WriteUInt(w, uint(len(desc.Data)), 1); err != nil {
return
}
if _, err = w.Write(desc.Data); err != nil {
return
}
}
return
}
writeBody := func(w io.Writer) (err error) {
if err = WriteUInt(w, self.PCRPID|7<<13, 2); err != nil {
return
}
bw := &bytes.Buffer{}
if err = writeDescs(bw, self.ProgramDescriptors); err != nil {
return
}
if err = WriteUInt(w, 0xf<<12|uint(bw.Len()), 2); err != nil {
return
}
if _, err = w.Write(bw.Bytes()); err != nil {
return
}
for _, info := range self.ElementaryStreamInfos {
if err = WriteUInt(w, info.StreamType, 1); err != nil {
return
}
// Reserved(3)
// Elementary PID(13)
if err = WriteUInt(w, info.ElementaryPID|7<<13, 2); err != nil {
return
}
bw := &bytes.Buffer{}
if err = writeDescs(bw, info.Descriptors); err != nil {
return
}
// Reserved(6)
// ES Info length length(10)
if err = WriteUInt(w, uint(bw.Len())|0x3c<<10, 2); err != nil {
return
}
if _, err = w.Write(bw.Bytes()); err != nil {
return
}
}
return
}
bw := &bytes.Buffer{}
if err = writeBody(bw); err != nil {
return
}
psi := PSI{
TableId: 2,
TableIdExtension: 1,
}
if err = WritePSI(w, psi, bw.Bytes()); err != nil {
return
}
return
}
func WritePMTPacket(w io.Writer, pmt PMT, pid uint) (err error) {
tsw := &TSWriter{
W: w,
PID: pid,
DisableHeaderPadding: true,
}
bw := &bytes.Buffer{}
if err = WritePMT(bw, pmt); err != nil {
return
}
if err = tsw.Write(bw.Bytes()); err != nil {
return
}
return
}

17
ts/writer_test.go Normal file
View File

@ -0,0 +1,17 @@
package ts
import (
"bytes"
"encoding/hex"
"testing"
)
func TestWriteTSHeader(t *testing.T) {
bw := &bytes.Buffer{}
w := &TSWriter{
W: bw,
PCR: 0x12345678,
}
w.Write([]byte{'h', 'e', 'l', 'o'}[:], false)
t.Logf("\n%s", hex.Dump(bw.Bytes()))
}