def test_create_packet_constant_bitrate(self):
packet_size_bytes = 1200.0
bitrate_kbps = 1500.0
packet_source = PacketSource(packet_size_bytes)
for i in range(1, 11):
packet = packet_source.create_packet(bitrate_kbps)
self.assertEqual(i, packet.id)
self.assertNear(i * 8 * packet_size_bytes / bitrate_kbps,
packet.send_time_ms, 0.001)
def test_create_packet_variable_bitrate(self):
packet_size_bytes = 1200.0
packet_source = PacketSource(packet_size_bytes)
time_ms = 0.0
for i in range(1, 11):
bitrate_kbps = random.randint(150, 2500)
packet = packet_source.create_packet(bitrate_kbps)
time_ms += 8 * packet_size_bytes / bitrate_kbps
self.assertEqual(i, packet.id)
self.assertNear(time_ms, packet.send_time_ms, 0.001)
def test_receiving_rate_regular_packets(self):
for i in range(10):
bitrate_kbps = random.uniform(150.0, 2500.0)
packet_size_bytes = random.uniform(1.0, 8000.0)
delay_ms = random.uniform(10.0, 300.0)
packet_source = PacketSource(packet_size_bytes)
packets = []
for j in range(1000):
packet = packet_source.create_packet(bitrate_kbps)
packet.arrival_time_ms = packet.send_time_ms + delay_ms
packets.append(packet)
time_window_ms = random.uniform(0.0,
1.0) * packets[-1].arrival_time_ms
self.assertNear(receiving_rate_kbps(packets, time_window_ms),
bitrate_kbps, 0.001)
