Extract RTP from pcap to raw and convert to wav

extract_rtp.sh

#!/bin/bash

pcap_file="voip.pcap";  #nama file pcap
audio_output="suara.wav"; #output audio
raw_file="suara.raw"; #nama raw file hasil extract

if [ $EUID -ne 0 ]; then
	echo "This script must be run as root";
	exit 1;
fi

if [ -x /usr/bin/tshark ]; then
	ssrc=$(tshark -n -r $pcap_file -R rtp -T fields -e rtp.ssrc -Eseparator=, | sort -u | awk 'FNR ==1 {print}')
 	echo "SSRC: ";
	echo $ssrc;
	tshark -n -r $pcap_file -R rtp -R "rtp.ssrc == $ssrc" -T fields -e rtp.payload | tee payloads;
else
	echo "tshark tidak ditemukan";
fi
 

for payload in `cat payloads`; 
do 
	IFS=:; 
	for byte in $payload; 
	do 
		printf "\\x$byte" >> $raw_file; 
	done; 
done
 
if [ -x /usr/bin/sox ]; then
	echo 'sox has converted pcap to wav file';
	sox -t raw -r 8000 -v 4 -c 1 -U $raw_file $audio_output;
else
	echo "sox tidak ditemukan";
fi