112 lines
2.8 KiB
Python
112 lines
2.8 KiB
Python
#!/usr/bin/python3
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"""
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Author: Ryan Summers
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Description: Provides a mechanism for measuring Stabilizer stream data throughput.
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"""
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import argparse
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import logging
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import sys
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import time
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from stabilizer.stream import StabilizerStream
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class Timer:
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""" A basic timer for measuring elapsed time periods. """
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def __init__(self, period=1.0):
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""" Create the timer with the provided period. """
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self.start_time = time.time()
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self.trigger_time = self.start_time + period
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self.period = period
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self.started = False
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def is_triggered(self):
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""" Check if the timer period has elapsed. """
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now = time.time()
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return now >= self.trigger_time
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def start(self):
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""" Start the timer. """
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self.start_time = time.time()
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self.started = True
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def is_started(self):
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""" Check if the timer has started. """
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return self.started
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def arm(self):
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""" Arm the timer trigger. """
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self.trigger_time = time.time() + self.period
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def elapsed(self):
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""" Get the elapsed time since the timer was started. """
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now = time.time()
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return now - self.start_time
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def sequence_delta(previous_sequence, next_sequence):
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""" Check the number of items between two sequence numbers. """
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if previous_sequence is None:
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return 0
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delta = next_sequence - (previous_sequence + 1)
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return delta & 0xFFFFFFFF
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def main():
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""" Main program. """
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parser = argparse.ArgumentParser(description='Measure Stabilizer livestream quality')
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parser.add_argument('--port', type=int, default=2000,
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help='The port that stabilizer is streaming to')
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args = parser.parse_args()
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logging.basicConfig(level=logging.INFO,
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format='%(asctime)s.%(msecs)03d %(levelname)-8s %(message)s')
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last_index = None
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drop_count = 0
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good_blocks = 0
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total_bytes = 0
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timer = Timer()
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stream = StabilizerStream(args.port)
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while True:
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# Receive any data over UDP and parse it.
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for (seqnum, _) in stream.read_frame():
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if not timer.is_started():
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timer.start()
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# Handle any dropped packets.
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drop_count += sequence_delta(last_index, seqnum)
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last_index = seqnum
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good_blocks += 1
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# Report the throughput periodically.
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if timer.is_triggered():
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drate = stream.get_rx_bytes() * 8 / 1e6 / timer.elapsed()
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print(f'''
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Data Rate: {drate:.3f} Mbps
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Received Blocks: {good_blocks}
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Dropped blocks: {drop_count}
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Metadata: {total_bytes / 1e6:.3f} MB in {timer.elapsed():.2f} s
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----
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''')
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sys.stdout.flush()
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timer.arm()
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if __name__ == '__main__':
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main()
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