def filter_ssrc(self, chosen_ssrc):
"""Filters and wraps data points.
Removes data points with `ssrc != chosen_ssrc`. Unwraps sequence
numbers and timestamps for the chosen selection.
"""
self.data_points = [point for point in self.data_points if point.ssrc == chosen_ssrc]
unwrapped_sequence_numbers = misc.unwrap([point.sequence_number for point in self.data_points], 2 ** 16 - 1)
for (data_point, sequence_number) in zip(self.data_points, unwrapped_sequence_numbers):
data_point.sequence_number = sequence_number
unwrapped_timestamps = misc.unwrap([point.timestamp for point in self.data_points], 2 ** 32 - 1)
for (data_point, timestamp) in zip(self.data_points, unwrapped_timestamps):
data_point.timestamp = timestamp
def testRandomlyDataShouldNotChangeAfterUnwrap(self):
random_data = [random.randint(0, 9) for _ in range(100)]
random_data_copy = random_data[:]
for mod in range(1, 100):
_ = misc.unwrap(random_data, mod)
self.assertEqual(random_data, random_data_copy)
def testRandomlyDataShouldNotChangeAfterUnwrap(self):
random_data = [random.randint(0, 9) for _ in range(100)]
random_data_copy = random_data[:]
for mod in range(1, 100):
_ = misc.unwrap(random_data, mod)
self.assertEqual(random_data, random_data_copy)
def testRandomlyMultiplesOfModAdded(self):
# `unwrap` definition says only multiples of mod are added.
random_data = [random.randint(0, 9) for _ in range(100)]
for mod in range(1, 100):
random_data_unwrapped_mod = misc.unwrap(random_data, mod)
for (old_a, a) in zip(random_data, random_data_unwrapped_mod):
self.assertEqual((old_a - a) % mod, 0)
def testRandomlyMultiplesOfModAdded(self):
# `unwrap` definition says only multiples of mod are added.
random_data = [random.randint(0, 9) for _ in range(100)]
for mod in range(1, 100):
random_data_unwrapped_mod = misc.unwrap(random_data, mod)
for (old_a, a) in zip(random_data, random_data_unwrapped_mod):
self.assertEqual((old_a - a) % mod, 0)
def testRandomlyAgainstInequalityDefinition(self):
# Data has to satisfy -mod/2 <= difference < mod/2 for every
# difference between consecutive values after unwrap.
random_data = [random.randint(0, 9) for _ in range(100)]
for mod in range(1, 100):
random_data_unwrapped_mod = misc.unwrap(random_data, mod)
for (a, b) in zip(random_data_unwrapped_mod,
random_data_unwrapped_mod[1:]):
self.assertTrue(-mod / 2 <= b - a < mod / 2)
def filter_ssrc(self, chosen_ssrc):
"""Filters and wraps data points.
Removes data points with `ssrc != chosen_ssrc`. Unwraps sequence
numbers and timestamps for the chosen selection.
"""
self.data_points = [point for point in self.data_points if
point.ssrc == chosen_ssrc]
unwrapped_sequence_numbers = misc.unwrap(
[point.sequence_number for point in self.data_points], 2**16 - 1)
for (data_point, sequence_number) in zip(self.data_points,
unwrapped_sequence_numbers):
data_point.sequence_number = sequence_number
unwrapped_timestamps = misc.unwrap([point.timestamp for point in
self.data_points], 2**32 - 1)
for (data_point, timestamp) in zip(self.data_points,
unwrapped_timestamps):
data_point.timestamp = timestamp
def testRandomlyAgainstInequalityDefinition(self):
# Data has to satisfy -mod/2 <= difference < mod/2 for every
# difference between consecutive values after unwrap.
random_data = [random.randint(0, 9) for _ in range(100)]
for mod in range(1, 100):
random_data_unwrapped_mod = misc.unwrap(random_data, mod)
for (a, b) in zip(random_data_unwrapped_mod,
random_data_unwrapped_mod[1:]):
self.assertTrue(-mod / 2 <= b - a < mod / 2)
def testDataShouldNotChangeAfterUnwrap(self):
data = [0, 1, 2, 0, -1, -2, -3, -4]
_ = misc.unwrap(data, 4)
self.assertEqual([0, 1, 2, 0, -1, -2, -3, -4], data)
def testUnwrapMod4(self): data = [0, 1, 2, 0, -1, -2, -3, -4] unwrapped_4 = misc.unwrap(data, 4) self.assertEqual([0, 1, 2, 0, -1, -2, -3, -4], unwrapped_4)
def testUnwrapMod3(self): data = [0, 1, 2, 0, -1, -2, -3, -4] unwrapped_3 = misc.unwrap(data, 3) self.assertEqual([0, 1, 2, 3, 2, 1, 0, -1], unwrapped_3)
def testDataShouldNotChangeAfterUnwrap(self):
data = [0, 1, 2, 0, -1, -2, -3, -4]
_ = misc.unwrap(data, 4)
self.assertEqual([0, 1, 2, 0, -1, -2, -3, -4], data)
def testUnwrapMod4(self):
data = [0, 1, 2, 0, -1, -2, -3, -4]
unwrapped_4 = misc.unwrap(data, 4)
self.assertEqual([0, 1, 2, 0, -1, -2, -3, -4], unwrapped_4)
def testUnwrapMod3(self):
data = [0, 1, 2, 0, -1, -2, -3, -4]
unwrapped_3 = misc.unwrap(data, 3)
self.assertEqual([0, 1, 2, 3, 2, 1, 0, -1], unwrapped_3)
