def disable_cameras(self,
wait_for_disable: bool = False,
timeout: float = 5,
retry: bool = True) -> None:
"""Disables camera by setting dac output low."""
self.logger.debug("Disabling cameras")
# Check if using usb mux
if not self.usb_mux_enabled:
self.logger.debug("Cameras always enabled, not using mux")
return
# Turn off usb mux channel
try:
channel = self.usb_mux_channel
self.dac5578.set_low(channel=channel, retry=retry)
except DAC5578DriverError as e:
raise exceptions.DisableCameraError(logger=self.logger) from e
# Check if waiting for disable
if not wait_for_disable:
return
# Wait for camera to be disabled
self.logger.debug("Waiting for cameras to become disabled")
# Check if simulated
if self.simulated:
self.logger.debug("Simulated camera disable complete")
return
# Initialize timing variables
start_time = time.time()
# Loop forever
while True:
# Look for camera
try:
camera_paths = usb.get_camera_paths(self.vendor_id,
self.product_id)
# Check if all cameras are disables
if camera_paths == []:
self.logger.debug("All cameras disabled")
return
except Exception as e:
raise exceptions.DisableCameraError(logger=self.logger) from e
# Check for timeout
if time.time() - start_time > timeout:
message = "timed out"
raise exceptions.DisableCameraError(message=message,
logger=self.logger)
# Update every 100ms
time.sleep(0.1)
def capture_images(self) -> None:
"""Captures an image from each active camera."""
self.logger.debug("Capturing images")
# Get real or simulated camera paths
if not self.simulate:
camera_paths = usb.get_camera_paths(self.vendor_id,
self.product_id)
else:
camera_paths = []
for i in range(self.num_cameras):
camera_paths.append("simulate_path")
# Check correct number of camera paths
num_detected = len(camera_paths)
if num_detected != self.num_cameras:
message = "Incorrect number of cameras detected, expected {}, detected {}".format(
self.num_cameras, num_detected)
message += ". Proceeding with capture anyway"
self.logger.warning(message)
# Capture an image from each active camera
for index, camera_path in enumerate(camera_paths):
# Get timestring in ISO8601 format
timestring = datetime.datetime.utcnow().strftime(
"%Y-%m-%d-T%H:%M:%SZ")
# Get filename for individual camera or camera instance in set
if self.num_cameras == 1:
filename = "{}_{}.png".format(timestring, self.name)
else:
filename = "{}_{}.{}.png".format(timestring, self.name,
index + 1)
# Create image path
capture_image_path = self.capture_dir + filename
final_image_path = self.directory + filename
# Capture image
self.capture_image_pygame(camera_path, capture_image_path)
shutil.move(capture_image_path, final_image_path)
