New rtc dump analyzing tool in Python
R=henrik.lundin@webrtc.org, ivoc@webrtc.org, kwiberg@webrtc.org, peah@webrtc.org, phoglund@webrtc.org
Review-Url: https://codereview.webrtc.org/1999113002
Cr-Commit-Position: refs/heads/master@{#13218}
diff --git a/webrtc/tools/py_event_log_analyzer/misc.py b/webrtc/tools/py_event_log_analyzer/misc.py
new file mode 100644
index 0000000..50ac28e
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+++ b/webrtc/tools/py_event_log_analyzer/misc.py
@@ -0,0 +1,79 @@
+# Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.
+#
+# Use of this source code is governed by a BSD-style license
+# that can be found in the LICENSE file in the root of the source
+# tree. An additional intellectual property rights grant can be found
+# in the file PATENTS. All contributing project authors may
+# be found in the AUTHORS file in the root of the source tree.
+
+"""Utility functions for calculating statistics.
+"""
+
+from __future__ import division
+import collections
+import sys
+
+
+def count_reordered(sequence_numbers):
+ """Returns number of reordered indices.
+
+ A reordered index is an index `i` for which sequence_numbers[i] >=
+ sequence_numbers[i + 1]
+ """
+ return sum(1 for (s1, s2) in zip(sequence_numbers,
+ sequence_numbers[1:]) if
+ s1 >= s2)
+
+
+def ssrc_normalized_size_table(data_points):
+ """Counts proportion of data for every SSRC.
+
+ Args:
+ data_points: list of pb_parse.DataPoint
+
+ Returns:
+ A dictionary mapping from every SSRC in the data points. The
+ value of an SSRC `s` is the proportion of sizes of packets with
+ SSRC `s` to the total size of all packets.
+
+ """
+ mapping = collections.defaultdict(int)
+ for point in data_points:
+ mapping[point.ssrc] += point.size
+ return normalize_counter(mapping)
+
+
+def normalize_counter(counter):
+ """Returns a normalized version of the dictionary `counter`.
+
+ Does not modify `counter`.
+
+ Returns:
+ A new dictionary, in which every value in `counter`
+ has been divided by the total to sum up to 1.
+ """
+ total = sum(counter.values())
+ return {key: counter[key] / total for key in counter}
+
+
+def unwrap(data, mod):
+ """Returns `data` unwrapped modulo `mod`. Does not modify data.
+
+ Adds integer multiples of mod to all elements of data except the
+ first, such that all pairs of consecutive elements (a, b) satisfy
+ -mod / 2 <= b - a < mod / 2.
+
+ E.g. unwrap([0, 1, 2, 0, 1, 2, 7, 8], 3) -> [0, 1, 2, 3,
+ 4, 5, 4, 5]
+ """
+ lst = data[:]
+ for i in range(1, len(data)):
+ lst[i] = lst[i - 1] + (lst[i] - lst[i - 1] +
+ mod // 2) % mod - (mod // 2)
+ return lst
+
+# Python 2/3-compatible input function
+if sys.version_info[0] <= 2:
+ get_input = raw_input
+else:
+ get_input = input