def test_loss_ratio_gap_packets(self):
packets = []
for i in range(10):
# Only id and arrival time matter here
packet = Packet(i, None, None)
packet.arrival_time_ms = 10.0 * i
packets.append(packet)
for i in range(20, 30):
# Only id and arrival time matter here
packet = Packet(i, None, None)
packet.arrival_time_ms = 10.0 * i
packets.append(packet)
# Short time windows won't trigger loss computation.
for t in range(0, 200, 10):
self.assertEqual(loss_ratio(packets, t), 0.0)
for i in range(10):
time_window_ms = 200 + 10*i
loss = 1.0 - float(11 + i)/(21 + i)
self.assertEqual(loss_ratio(packets, time_window_ms), loss)
def test_loss_ratio_gap_packets(self):
packets = []
for i in range(10):
# Only id and arrival time matter here
packet = Packet(i, None, None)
packet.arrival_time_ms = 10.0 * i
packets.append(packet)
for i in range(20, 30):
# Only id and arrival time matter here
packet = Packet(i, None, None)
packet.arrival_time_ms = 10.0 * i
packets.append(packet)
# Short time windows won't trigger loss computation.
for t in range(0, 200, 10):
self.assertEqual(loss_ratio(packets, t), 0.0)
for i in range(10):
time_window_ms = 200 + 10 * i
loss = 1.0 - float(11 + i) / (21 + i)
self.assertEqual(loss_ratio(packets, time_window_ms), loss)
def receive_packet(self, packet):
self.time_ms.append(packet.arrival_time_ms)
self.packets.append(packet)
# Use delay as a signal.
# 1) Subtract Baseline.
# 2) Apply Median filter.
# 3) Apply Exponential Smoothing Filter.
# 4) Non-linear Estimate queuing delay warping.
delay_ms = packet.arrival_time_ms - packet.send_time_ms
self.baseline_delay_ms = min(self.baseline_delay_ms, delay_ms)
self.delay_signals_ms.append(delay_ms - self.baseline_delay_ms)
self.median_filtered_delays_ms.append(self.__median_filter())
self.exp_smoothed_delays_ms.append(self.__exp_smoothing_filter())
self.est_queuing_delays_ms.append(self.__non_linear_warping())
self.loss_ratios.append(loss_ratio(self.packets, NadaReceiver.LOSS_RATIO_TIME_WINDOW_MS))
self.receiving_rates_kbps.append(receiving_rate_kbps(self.packets, NadaReceiver.RECEIVING_RATE_TIME_WINDOW_MS))
self.congestion_signals_ms.append(self.est_queuing_delays_ms[-1] + NadaReceiver.LOSS_PENALTY_MS * self.loss_ratios[-1])
def test_loss_ratio_single_packet(self):
# Only id and arrival time matter here
packet = Packet(1, None, None)
packet.arrival_time_ms = 10.0
self.assertEqual(loss_ratio([packet], 0.0), 0.0)
self.assertEqual(loss_ratio([packet], 50.0), 0.0)
def test_loss_ratio_no_packets(self):
self.assertEqual(loss_ratio(None, 0.0), 0.0)
self.assertEqual(loss_ratio(None, 50.0), 0.0)
self.assertEqual(loss_ratio([], 0.0), 0.0)
self.assertEqual(loss_ratio([], 50.0), 0.0)
def test_loss_ratio_single_packet(self):
# Only id and arrival time matter here
packet = Packet(1, None, None)
packet.arrival_time_ms = 10.0
self.assertEqual(loss_ratio([packet], 0.0), 0.0)
self.assertEqual(loss_ratio([packet], 50.0), 0.0)
def test_loss_ratio_no_packets(self):
self.assertEqual(loss_ratio(None, 0.0), 0.0)
self.assertEqual(loss_ratio(None, 50.0), 0.0)
self.assertEqual(loss_ratio([], 0.0), 0.0)
self.assertEqual(loss_ratio([], 50.0), 0.0)