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Getting started with repacketisation

This commit is contained in:
Unknown 2017-12-11 14:23:06 +10:30
parent ae6b07ec96
commit bc7962b240
2 changed files with 291 additions and 0 deletions
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125
revid/repacketTest.go Normal file
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package main
import (
"bytes"
"flag"
"fmt"
"io"
"log"
"net"
"time"
"../rtp"
"github.com/beatgammit/rtsp"
)
func init() {
flag.Parse()
}
const sampleRequest = `OPTIONS rtsp://example.com/media.mp4 RTSP/1.0
CSeq: 1
Require: implicit-play
Proxy-Require: gzipped-messages
`
const sampleResponse = `RTSP/1.0 200 OK
CSeq: 1
Public: DESCRIBE, SETUP, TEARDOWN, PLAY, PAUSE
`
func main() {
if len(flag.Args()) >= 1 {
rtspUrl := flag.Args()[0]
rtpUrl := flag.Args()[1]
sess := rtsp.NewSession()
res, err := sess.Options(rtspUrl)
if err != nil {
log.Fatalln(err)
}
fmt.Println("Options:")
fmt.Println(res)
res, err = sess.Describe(rtspUrl)
if err != nil {
log.Fatalln(err)
}
fmt.Println("Describe:")
fmt.Println(res)
p, err := rtsp.ParseSdp(&io.LimitedReader{R: res.Body, N: res.ContentLength})
if err != nil {
log.Fatalln(err)
}
log.Printf("%+v", p)
fmt.Println("Setting up!")
rtpPort, rtcpPort := 17300, 17319
res, err = sess.Setup(rtpUrl, fmt.Sprintf("RTP/AVP;unicast;client_port=%d-%d", rtpPort, rtcpPort))
if err != nil {
log.Fatalln(err)
}
log.Println(res)
fmt.Println("Playing !")
res, err = sess.Play(rtspUrl, res.Header.Get("Session"))
if err != nil {
log.Fatalln(err)
}
log.Println(res)
// create udp connection for rtp stuff
rtpLaddr, err := net.ResolveUDPAddr("udp","192.168.0.109:17300")
if err != nil {fmt.Println("Local rtp addr not set!")}
rtpAddr, err := net.ResolveUDPAddr("udp","192.168.0.50:17300")
if err != nil { fmt.Println( "Resolving rtp address didn't work!")}
rtpConn, err := net.DialUDP("udp",rtpLaddr,rtpAddr)
if err != nil {fmt.Println("Rtp dial didn't work!")}
// Create udp connection for rtcp stuff
rtcpLaddr, err := net.ResolveUDPAddr("udp","192.168.0.109:17319")
if err != nil {fmt.Println("Local ")}
rtcpAddr, err := net.ResolveUDPAddr("udp","192.168.0.50:17301")
if err != nil {fmt.Println("resolving rtcp address didn't work!")}
rtcpConn, err := net.DialUDP("udp",rtcpLaddr, rtcpAddr)
if err != nil {fmt.Println("Rtcp dial didnt't work!")}
// let's create a session that will store useful stuff from the connections
rtpSession := rtp.New(rtpConn,rtcpConn)
// Loop here until we get something in the channels
for{
fmt.Printf("Length of rtpChan: %v\n", len(rtpSession.RtpChan))
time.Sleep(1*time.Second )
select{
case rtpPacket := <-rtpSession.RtpChan:
fmt.Println(rtpPacket)
default:
}
}
} else {
r, err := rtsp.ReadRequest(bytes.NewBufferString(sampleRequest))
if err != nil {
fmt.Println(err)
} else {
fmt.Println(r)
}
res, err := rtsp.ReadResponse(bytes.NewBufferString(sampleResponse))
if err != nil {
fmt.Println(err)
} else {
fmt.Println(res)
}
}
}

166
rtp/rtp.go Normal file
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/*
Copyright (c) 2015, T. Jameson Little <t.jameson.little@gmail.com>
All rights reserved.
Redistribution and use in source and binary forms, with or without modification,
are permitted provided that the following conditions are met:
1. Redistributions of source code must retain the above copyright notice, this
list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright notice,
this list of conditions and the following disclaimer in the documentation and/or
other materials provided with the distribution.
3. Neither the name of the copyright holder nor the names of its contributors
may be used to endorse or promote products derived from this software without
specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
OF THE POSSIBILITY OF SUCH DAMAGE.
*/
package rtp
import (
"net"
"fmt"
)
const (
RTP_VERSION = 2
)
const (
hasRtpPadding = 1 << 5
hasRtpExt = 1 << 4
)
type RtpPacket struct {
Version byte
Padding bool
Ext bool
Marker bool
PayloadType byte
SequenceNumber uint
Timestamp uint
SyncSource uint
CSRC []uint
ExtHeader uint
ExtData []byte
Payload []byte
}
type Session struct {
Rtp net.PacketConn
Rtcp net.PacketConn
RtpChan <-chan RtpPacket
RtcpChan <-chan []byte
rtpChan chan<- RtpPacket
rtcpChan chan<- []byte
}
func New(rtp, rtcp net.PacketConn) *Session {
rtpChan := make(chan RtpPacket, 10)
rtcpChan := make(chan []byte, 10)
s := &Session{
Rtp: rtp,
Rtcp: rtcp,
RtpChan: rtpChan,
RtcpChan: rtcpChan,
rtpChan: rtpChan,
rtcpChan: rtcpChan,
}
go s.HandleRtpConn(rtp)
go s.HandleRtcpConn(rtcp)
return s
}
func toUint(arr []byte) (ret uint) {
for i, b := range arr {
ret |= uint(b) << (8 * uint(len(arr)-i-1))
}
return ret
}
func (s *Session) HandleRtpConn(conn net.PacketConn) {
buf := make([]byte, 4096)
for {
n, _, err := conn.ReadFrom(buf)
if err != nil {
panic(err)
}
cpy := make([]byte, n)
copy(cpy, buf)
go s.handleRtp(cpy)
}
}
func (s *Session) HandleRtcpConn(conn net.PacketConn) {
buf := make([]byte, 4096)
for {
n, _, err := conn.ReadFrom(buf)
if err != nil {
panic(err)
}
cpy := make([]byte, n)
copy(cpy, buf)
go s.handleRtcp(cpy)
}
}
func (s *Session) handleRtp(buf []byte) {
fmt.Println(buf)
packet := RtpPacket{
Version: (buf[0] & 0xC0)>>6,
Padding: buf[0]&hasRtpPadding != 0,
Ext: buf[0]&hasRtpExt != 0,
Marker: buf[1]&1 != 0,
PayloadType: buf[1] >> 1,
SequenceNumber: toUint(buf[2:4]),
Timestamp: toUint(buf[4:8]),
SyncSource: toUint(buf[8:12]),
CSRC: make([]uint, buf[0]>>4),
}
if packet.Version != RTP_VERSION {
fmt.Printf("Packet version: %v", packet.Version)
panic("Unsupported version")
}
i := 12
for j := range packet.CSRC {
packet.CSRC[j] = toUint(buf[i : i+4])
i += 4
}
if packet.Ext {
packet.ExtHeader = toUint(buf[i : i+2])
length := toUint(buf[i+2 : i+4])
i += 4
if length > 0 {
packet.ExtData = buf[i : i+int(length)*4]
i += int(length) * 4
}
}
packet.Payload = buf[i:]
s.rtpChan <- packet
}
func (s *Session) handleRtcp(buf []byte) {
// TODO: implement rtcp
}