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Added a lock to start_preview and caught errors

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This commit is contained in:
Richard Bowman 2019-04-08 14:05:29 +01:00
parent 24ded8de32
commit ec50d245ab
1 changed files with 13 additions and 4 deletions
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17
openflexure_microscope/camera/pi.py
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@ -228,10 +228,17 @@ class StreamingCamera(BaseCamera):
def start_preview(self, fullscreen=True, window=None) -> bool:
"""Start the on board GPU camera preview."""
logging.info("Starting the GPU preview")
self.start_stream_recording()
self.camera.start_preview(fullscreen=fullscreen, window=window)
self.state['preview_active'] = True
time.sleep(0.2)
try:
with self.lock:
self.camera.start_preview(fullscreen=fullscreen, window=window)
self.state['preview_active'] = True
time.sleep(0.2)
except picamera.exc.PiCameraMMALError as e:
logging.error("Suppressed a MMALError in start_preview. Exception: {}".format(e))
except picamera.exc.PiCameraValueError as e:
logging.error("Suppressed a ValueError exception in start_preview. Exception: {}".format(e))
return True
def stop_preview(self) -> bool:
@ -366,7 +373,9 @@ class StreamingCamera(BaseCamera):
self.stream,
format='mjpeg',
quality=self.config['jpeg_quality'],
bitrate=-1, # RWB: disable bitrate control
bitrate=-1, # RWB: disable bitrate control
# (bitrate control makes JPEG size less good as a focus
# metric)
splitter_port=splitter_port)
except picamera.exc.PiCameraAlreadyRecording:
logging.info("Error while starting preview: Recording already running.")