av/packet/RtpToTsConverter.go

/*
NAME
  RtpToTsConverter.go - provides utilities for the conversion of Rtp packets
  to equivalent MpegTs packets.

DESCRIPTION
  See Readme.md

AUTHOR
  Saxon Nelson-Milton <saxon.milton@gmail.com>

LICENSE
  RtpToTsConverter.go is Copyright (C) 2017 the Australian Ocean Lab (AusOcean)

  It is free software: you can redistribute it and/or modify them
  under the terms of the GNU General Public License as published by the
  Free Software Foundation, either version 3 of the License, or (at your
  option) any later version.

  It is distributed in the hope that it will be useful, but WITHOUT
  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
 for more details.

  You should have received a copy of the GNU General Public License
  along with revid in gpl.txt.  If not, see [GNU licenses](http://www.gnu.org/licenses).
*/

package packet

type RtpToTsConverter interface {
  Convert()
}

type rtpToTsConverter struct {
  TsChan <-chan *MpegTsPacket
  RtpChan chan<- RtpPacket
  tsChan chan<- *MpegTsPacket
  rtpChan <-chan RtpPacket
  currentTsPacket *MpegTsPacket
  currentCC byte
  payloadByteChan chan byte
}

func NewRtpToTsConverter() (c *rtpToTsConverter) {
  c = new(rtpToTsConverter)
  tsChan := make(chan *MpegTsPacket,100)
  rtpChan := make(chan RtpPacket,100)
  c.TsChan = tsChan
  c.RtpChan = rtpChan
  c.tsChan = tsChan
  c.rtpChan = rtpChan
  c.currentTsPacket = new(MpegTsPacket)
  c.currentCC = 0
  c.payloadByteChan = make(chan byte, 10000)
  return
}

func (c* rtpToTsConverter) Convert() {
    for {
      select{
      default:
      case rtpPacket := <-c.rtpChan:
        for ii := range rtpPacket.Payload {
          c.payloadByteChan<-rtpPacket.Payload[ii]
        }
        for len(c.payloadByteChan) > 156 {
          c.currentTsPacket = new(MpegTsPacket)
          c.currentTsPacket.SyncByte = 0x47
          c.currentTsPacket.TEI = false
          c.currentTsPacket.PUSI = true
          c.currentTsPacket.Priority = false
          c.currentTsPacket.PID = 4096
          c.currentTsPacket.TSC = 0
          c.currentTsPacket.AFC = 1
          c.currentTsPacket.Payload = make([]byte, 156)
          for ii:=0; ii < 156; ii++ {
            c.currentTsPacket.Payload[ii] = <-c.payloadByteChan
          }
          c.tsChan<-c.currentTsPacket
        }
      }
    }

}