#!/usr/bin/env python

from scapy.all import rdpcap, wrpcap

def process_packets(in_file_name, out_file_name, scale_factor):
	pkts = rdpcap(in_file_name)
	cooked=[]
	#timestamp = 1234567890.000000
	base_timestamp = None
	for p in pkts:
		if not base_timestamp:
			base_timestamp = p.time
		delta_time = p.time - base_timestamp
		p.time = base_timestamp + (scale_factor * delta_time)
		pmod=p
		cooked.append(pmod)
	wrpcap(out_file_name, cooked)


process_packets("sample.pcap", "modified.pcap", 12.0)