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Re-calculate time offset from CPU time to real time on each frame

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This commit is contained in:
Julian Stirling 2026-07-18 13:38:26 -03:00
parent 3b89a499d0
commit a7b298889a
1 changed files with 4 additions and 3 deletions
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7
src/openflexure_microscope_server/things/camera/picamera.py
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@ -86,8 +86,6 @@ class PicameraStreamOutput(Output):
Output.__init__(self) Output.__init__(self)
self.stream = stream self.stream = stream
self.encoder = encoder self.encoder = encoder
# The difference between unix time and the CPU time
self.cpu_dt = time.time() - time.monotonic()
def outputframe( def outputframe(
self, self,
@ -101,10 +99,13 @@ class PicameraStreamOutput(Output):
if timestamp is None or self.encoder.firsttimestamp is None: if timestamp is None or self.encoder.firsttimestamp is None:
frame_timestamp = None frame_timestamp = None
else: else:
# The difference between unix time and the CPU time. Do not cache this
# number as it can change with clock slew or other time adjustments.
cpu_dt = time.time() - time.monotonic()
# Reconstruct full CPU time of the frame in us # Reconstruct full CPU time of the frame in us
timestamp += self.encoder.firsttimestamp timestamp += self.encoder.firsttimestamp
# Convert to datetime # Convert to datetime
frame_timestamp = datetime.fromtimestamp(self.cpu_dt + timestamp / 1e6) frame_timestamp = datetime.fromtimestamp(cpu_dt + timestamp / 1e6)
self.stream.add_frame(frame, frame_timestamp) self.stream.add_frame(frame, frame_timestamp)