Add ETI duplicate frame removal helper tool

1 files changed, 51 insertions, 0 deletions

diff --git a/remove-duplicate-frames.py b/remove-duplicate-frames.py
new file mode 100755
index 0000000..c6451d8
--- /dev/null
+++ b/remove-duplicate-frames.py
@@ -0,0 +1,51 @@
+#!/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)
+