mirror of https://bitbucket.org/ausocean/av.git
258 lines
8.6 KiB
Go
258 lines
8.6 KiB
Go
/*
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NAME
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RtpToTsConverter.go - provides utilities for the conversion of Rtp packets
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to equivalent MpegTs packets.
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DESCRIPTION
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See Readme.md
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AUTHOR
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Saxon Nelson-Milton <saxon.milton@gmail.com>
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LICENSE
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RtpToTsConverter.go is Copyright (C) 2017 the Australian Ocean Lab (AusOcean)
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It is free software: you can redistribute it and/or modify them
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under the terms of the GNU General Public License as published by the
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Free Software Foundation, either version 3 of the License, or (at your
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option) any later version.
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It is distributed in the hope that it will be useful, but WITHOUT
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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for more details.
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You should have received a copy of the GNU General Public License
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along with revid in gpl.txt. If not, see [GNU licenses](http://www.gnu.org/licenses).
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*/
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package generator
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import (
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_"fmt"
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_"os"
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//"bitbucket.org/ausocean/av/mpegts"
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//"bitbucket.org/ausocean/av/pes"
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//"bitbucket.org/ausocean/av/tools"
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//"bitbucket.org/ausocean/av/rtp"
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"../mpegts"
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"../pes"
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"../tools"
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"../rtp"
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)
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var (
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PatTable = []byte{0, 0, 176, 13, 0, 1, 193, 0, 0, 0, 1, 240, 0, 42, 177, 4, 178, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,}
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PmtTable = []byte{0, 2, 176, 18, 0, 1, 193, 0, 0, 0xE1, 0x00, 0xF0, 0, 0x1B, 0xE1, 0, 0xF0, 0, 0x15, 0xBD, 0x4D, 0x56, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,}
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)
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const (
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SdtPid = 17
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PatPid = 0
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PmtPid = 4096
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VideoPid = 256
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)
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type tsGenerator struct {
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rtpInputChan chan rtp.RtpPacket
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outputChan chan []byte
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nalInputChan chan []byte
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currentTsPacket *mpegts.MpegTsPacket
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payloadByteChan chan byte
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currentCC byte
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currentPtsTime float64
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currentPcrTime float64
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fps uint
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pesPktChan chan []byte
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ccMap map[int]int
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}
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func (g *tsGenerator)GetInputChan() chan []byte {
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return g.nalInputChan
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}
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func (g *tsGenerator)GetOutputChan() chan []byte {
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return g.outputChan
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}
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func NewTsGenerator(fps uint) (g *tsGenerator) {
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g = new(tsGenerator)
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g.outputChan = make(chan []byte, 100)
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g.rtpInputChan = make(chan rtp.RtpPacket, 100)
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g.nalInputChan = make(chan []byte, 10000)
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g.currentCC = 0
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g.fps = fps
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g.currentPcrTime = .0
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g.currentPtsTime = .7
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g.pesPktChan = make(chan []byte, 1000)
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g.payloadByteChan = make(chan byte, 100000)
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g.ccMap = make(map[int]int, 4)
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g.ccMap[SdtPid] = 0
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g.ccMap[PatPid] = 0
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g.ccMap[PmtPid] = 0
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g.ccMap[VideoPid] = 0
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return
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}
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func (g *tsGenerator) genPts()(pts uint64){
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pts = uint64(g.currentPtsTime * float64(90000))
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g.currentPtsTime += 1.0/float64(g.fps)
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return
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}
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func (g *tsGenerator) genPcr()(pcr uint64){
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pcr = uint64(g.currentPcrTime * float64(90000))
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g.currentPcrTime += 1.0/float64(g.fps)
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return
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}
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func (g *tsGenerator) Start(){
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go g.generate()
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}
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func (g *tsGenerator) generate() {
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var rtpBuffer [](*rtp.RtpPacket)
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for {
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select {
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case rtpPacket := <-g.rtpInputChan:
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rtpBuffer = append(rtpBuffer, &rtpPacket)
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if len(rtpBuffer) > 2 {
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// if there's something weird going on with sequence numbers then
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// insertion sort
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if rtpPacket.SequenceNumber < rtpBuffer[len(rtpBuffer)-2].SequenceNumber {
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for i := 1; i < len(rtpBuffer); i++ {
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for j := i; j > 0 && rtpBuffer[j].SequenceNumber < rtpBuffer[j-1].SequenceNumber; j-- {
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temp := rtpBuffer[j]
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rtpBuffer[j] = rtpBuffer[j-1]
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rtpBuffer[j-1] = temp
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}
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}
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}
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}
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if len(rtpBuffer) > 200 {
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for tools.GetOctectType(rtpBuffer[0]) != 7 {
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rtpBuffer = rtpBuffer[1:]
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}
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sps := make([]byte, len(rtpBuffer[0].Payload))
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copy(sps[:], rtpBuffer[0].Payload[:])
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rtpBuffer = rtpBuffer[1:]
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pps := make([]byte, len(rtpBuffer[0].Payload))
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copy(pps[:], rtpBuffer[0].Payload[:])
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rtpBuffer = rtpBuffer[1:]
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sei := make([]byte, len(rtpBuffer[0].Payload))
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copy(sei[:], rtpBuffer[0].Payload[:])
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rtpBuffer = rtpBuffer[1:]
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for tools.GetOctectType(rtpBuffer[0]) != 7 {
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switch tools.GetOctectType(rtpBuffer[0]) {
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case 28:
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if tools.GetStartBit(rtpBuffer[0]) == 1 {
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var buffer []byte
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buffer = append(buffer, []byte{0x00, 0x00, 0x01}...)
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buffer = append(buffer, []byte{0x09, 0x10}...)
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buffer = append(buffer, []byte{0x00, 0x00, 0x01}...)
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buffer = append(buffer, sps...)
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buffer = append(buffer, []byte{0x00, 0x00, 0x01}...)
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buffer = append(buffer, pps...)
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buffer = append(buffer, []byte{0x00, 0x00, 0x01}...)
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buffer = append(buffer, sei...)
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buffer = append(buffer, []byte{0x00, 0x00, 0x01}...)
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buffer = append(buffer, rtpBuffer[0].Payload[0]&0xE0|rtpBuffer[0].Payload[1]&0x1F)
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buffer = append(buffer, rtpBuffer[0].Payload[2:]...)
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rtpBuffer = rtpBuffer[1:]
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for {
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buffer = append(buffer, rtpBuffer[0].Payload[2:]...)
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if tools.GetEndBit(rtpBuffer[0]) == 1 {
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rtpBuffer = rtpBuffer[1:]
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g.nalInputChan <- buffer
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break
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}
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rtpBuffer = rtpBuffer[1:]
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}
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}
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case 1:
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var buffer []byte
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buffer = append(buffer, []byte{0x00, 0x00, 0x01}...)
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buffer = append(buffer, []byte{0x09, 0x10}...)
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buffer = append(buffer, []byte{0x00, 0x00, 0x01}...)
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buffer = append(buffer, sps...)
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buffer = append(buffer, []byte{0x00, 0x00, 0x01}...)
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buffer = append(buffer, pps...)
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buffer = append(buffer, []byte{0x00, 0x00, 0x01}...)
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buffer = append(buffer, sei...)
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buffer = append(buffer, []byte{0x00, 0x00, 0x01}...)
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buffer = append(buffer, rtpBuffer[0].Payload[0]&0xE0|rtpBuffer[0].Payload[1]&0x1F)
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buffer = append(buffer, rtpBuffer[0].Payload[2:]...)
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rtpBuffer = rtpBuffer[1:]
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g.nalInputChan <- buffer
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default:
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}
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}
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}
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case nalUnit := <-g.nalInputChan:
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pesPkt := pes.PESPacket{
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StreamID: 0xE0,
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PDI: byte(2),
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PTS: g.genPts(),
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Data: nalUnit,
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HeaderLength: 5,
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}
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g.pesPktChan <- pesPkt.ToByteSlice()
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case pesPkt := <-g.pesPktChan:
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for ii := range pesPkt {
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g.payloadByteChan <- pesPkt[ii]
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}
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pusi := true
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for len(g.payloadByteChan) > 0 {
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pkt := mpegts.MpegTsPacket{
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PUSI: pusi,
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PID: VideoPid,
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RAI: pusi,
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CC: byte(g.getCC(VideoPid)),
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AFC: byte(3),
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PCRF: pusi,
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}
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pkt.FillPayload(g.payloadByteChan)
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if pusi {
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// Create pat table and send off
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patPkt := mpegts.MpegTsPacket{
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PUSI: pusi,
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PID: PatPid,
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CC: byte(g.getCC(PatPid)),
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AFC: 1,
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Payload: PatTable,
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}
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patPktAsByteSlice, _ := patPkt.ToByteSlice()
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g.outputChan <- patPktAsByteSlice
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// Create pmt table and send off
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pmtPkt := mpegts.MpegTsPacket{
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PUSI: pusi,
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PID: PmtPid,
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CC: byte(g.getCC(PmtPid)),
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AFC: 1,
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Payload: PmtTable,
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}
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pmtPktAsByteSlice, _ := pmtPkt.ToByteSlice()
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g.outputChan <- pmtPktAsByteSlice
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pkt.PCR = g.genPcr()
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pusi = false
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}
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pktAsBytelice, _ := pkt.ToByteSlice()
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g.outputChan<-pktAsBytelice
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}
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}
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}
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}
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func (g *tsGenerator) getCC(pid int) int {
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temp := g.ccMap[pid]
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if g.ccMap[pid]++; g.ccMap[pid] > 15 {
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g.ccMap[pid] = 0
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}
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return temp
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}
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