blob: 629497c0186949909e3e25bfe047c1892d56af00 [file] [log] [blame]
# 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 CountReordered(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 SsrcNormalizedSizeTable(data_points):
"""Counts proportion of data for every SSRC.
data_points: list of pb_parse.DataPoint
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 NormalizeCounter(mapping)
def NormalizeCounter(counter):
"""Returns a normalized version of the dictionary `counter`.
Does not modify `counter`.
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
def SsrcDirections(data_points):
ssrc_is_incoming = {}
for point in data_points:
ssrc_is_incoming[point.ssrc] = point.incoming
return ssrc_is_incoming
# Python 2/3-compatible input function
if sys.version_info[0] <= 2:
get_input = raw_input # pylint: disable=invalid-name
get_input = input # pylint: disable=invalid-name