openpilot is an open source driver assistance system. openpilot performs the functions of Automated Lane Centering and Adaptive Cruise Control for over 200 supported car makes and models.
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#!/usr/bin/env python3
import cereal.messaging as messaging
if __name__ == "__main__":
modeld_sock = messaging.sub_sock("modelV2")
last_frame_id = None
start_t: int | None = None
frame_cnt = 0
dropped = 0
while True:
m = messaging.recv_one(modeld_sock)
if m is None:
continue
frame_id = m.modelV2.frameId
t = m.logMonoTime / 1e9
frame_cnt += 1
if start_t is None:
start_t = t
last_frame_id = frame_id
continue
d_frame = frame_id - last_frame_id
dropped += d_frame - 1
expected_num_frames = int((t - start_t) * 20)
frame_drop = 100 * (1 - (expected_num_frames / frame_cnt))
print(f"Num dropped {dropped}, Drop compared to 20Hz: {frame_drop:.2f}%")
last_frame_id = frame_id