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#!/usr/bin/env python
#
# This script removes duplicate frames from a RAW ETI file.
# It reads FCT from etisnoop output and only copies the
# frames if the FCT is increasing by one.
#
# usage:
# etisnoop -v -i in.eti | remove-duplicate-frames.py in.eti out.eti
import sys
import re
regex = re.compile(r'Frame Count \[([0-9]+)\]')
if len(sys.argv) < 3:
print("usage: etisnoop -vi in.eti | {} in.eti out.eti".format(sys.argv[0]))
sys.exit(1)
eti_in = open(sys.argv[1], "rb")
eti_out = open(sys.argv[2], "wb")
lastfct = -1
while True:
line = sys.stdin.readline()
if line == '':
break
fct = 0
m = regex.search(line)
if m is None:
continue
else:
fct = int(m.groups()[0])
if lastfct == 0 and fct == 249:
print("Ignore {} duplicate rollover".format(fct))
eti_in.read(6144)
elif fct > lastfct:
print("Take {}".format(fct))
eti_out.write(eti_in.read(6144))
lastfct = fct
elif lastfct == 249 and fct == 0:
print("Take {} because rollover".format(fct))
eti_out.write(eti_in.read(6144))
lastfct = fct
else:
print("Ignore {}".format(fct))
eti_in.read(6144)
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