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The following script (r.mp4.m) starts relying
mechanism. It first checks whether the relay is already
established and if it is so, the script simply exits.
If the relay is not established, the script starts relay to
to the DSS2 host (using rtptrans or equivalently combination
of rtpdump and rtpplay). Finally, before exit, the script
spawns control script (r.ch.2) and parses PID of
rtp-transport programs.
#!/bin/bash
multip=226.91.0.22 # multicast IP on the local host
multport=38028 # multicast port on the local host
multporta=38030 # multicast port on the local host
host=194.109.218.117 # IP number of the remote DSS
port=48028 # UDP port on the remote DSS
porta=58030 # UDP port on the remote DSS
sdp=l-rel-mp4 # sdp file on the host
locsdp=rtsp://204.181.65.11:7071/a-v-m
loccip=204.181.65
#### no need to change anything beyond this point
pids="" # PID of the video rtp-transport
pidsa="" # PID of the audio rtp-transport
rtpd="/var/www/cgi-bin/rtpdump"
rtpp="/var/www/cgi-bin/rtpplay"
if [ $loccip == $( echo $REMOTE_ADDR | cut -f1,2,3 -d. ) ]
then
echo Content-type: application/x-quicktime-media-link
echo
echo \<\?xml version=\"1.0\"\?\>
echo \<\?quicktime type=\"application/x-quicktime-media-link\"\?\>
echo \<embed src=\"$locsdp\" autoplay=\"true\" \/\>
exit 0
fi
if [ -f "/tmp/$host.rel" ]
then
if [ $(netstat -au | grep $host | grep -c ESTABLISHED) -gt 0 ]
then
echo Content-type: application/x-quicktime-media-link
echo
echo \<\?xml version=\"1.0\"\?\>
echo \<\?quicktime type=\"application/x-quicktime-media-link\"\?\>
echo \<embed src=\"rtsp://$host/$sdp\" autoplay=\"true\" \/\>
exit $NOPROCESS
else
zombpr1=$(ps auxw | grep rtpdump | grep $multport | awk '{ print($2) }')
let "zombpr2 = $zombpr1 + 2"
let "zombpr3 = $zombpr1 + 4"
kill -9 $zombpr1 $zombpr2 $zombpr3
rm -fr /tmp/$host.rel
fi
fi
$rtpd -F dump $multip/$multport | $rtpp $host/$port/127 &> /tmp/$host.rel &
pids="$pids $!"
let "pids = $pids -1"
$rtpd -F dump $multip/$multporta | $rtpp $host/$porta/127 &> /dev/null &
pidsa="$pidsa $!"
let "pidsa = $pidsa -1"
/var/www/cgi-bin/r.ch.2 $host $pids $pidsa < /dev/null > /dev/null 2>&1 &
echo Content-type: application/x-quicktime-media-link
echo
echo \<\?xml version=\"1.0\"\?\>
echo \<\?quicktime type=\"application/x-quicktime-media-link\"\?\>
echo \<embed src=\"rtsp://$host/$sdp\" autoplay=\"true\" \/\>
exit 0
Control mechanism is established through relay.ch
script. It checks whiter any client at DSS2 server is
requesting the stream, and if not after 50 unsuccessful
relaying cycles, the script stops RTPTRANS.
#!/bin/sh
until [ $(grep -c refused /tmp/$1.rel) -gt 25 ]; do
sleep 1s
done
rm -f /tmp/$1.rel
kill -9 $2 > /dev/null
kill -9 $3 > /dev/null
SDP file on the second server DSS2 describes to relay, and
is a standard SDP file:
v=0
o=- 1012366293653228 1012366293653230 IN IP4 194.109.218.117
s=Relay to Mont
e=NONE
t=0 0
a=sendonly
a=x-bufferdelay:4
c=IN IP4 194.109.218.117
b=RR:0
m=video 46946 RTP/AVP 31
a=cliprect:16,16,256,336
Scripts are available in the following tar file scripts.tar.
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