_gentl.ResourceInUseException when trying to restart camera after unable to fetch buffer with try_fetch()
AndreaMazzoleniOOI opened this issue · 1 comments
AndreaMazzoleniOOI commented
Describe the Issue
I have a GeniNano camera acquiring images every 60s. The applications runs on a RaspberryPi 4, with Harvester installation performed as in #254. The camera start acquiring data when the GenieNanoCamera object is initialized and a Kivy app calls a try_fetch() every 60s. try_fecth() is implemented in the GenieNanoCamera.grab_image() method. After some time, the camera is unable to fetch the buffer, thus None is returned. If i try to stop and restart the camera I get the _gentl.ResourceInUseException and it stays in this state.
Sample Code
I have a callback managed by the KIvy Clock object where I try to stop and restart the camera:
def callback(self):
img = Cam.grab_image(show=False)
# Couldn't fetch img --> img = None --> restart camera
if img is None:
Cam.camera.stop()
Cam.start()
return
# Some other code here
return
Cam is a GenieNanoCamera object defined as below:
class GenieNanoCamera(Camera):
def __init__(self):
super().__init__()
self.h = Harvester()
self.h.reset()
self.h.add_file('/opt/mvIMPACT_Acquire/lib/arm64/mvGenTLProducer.cti') # path to your GenTLProducer.cti file
self.h.update()
self.camera = self.h.create(0)
# self.set_parameters(image_format='Mono8', exposure_time=50000, gain_raw=0, fps=9)
self.connect()
def connect(self):
self.camera.start()
def disconnect(self):
self.camera.stop()
self.camera.destroy()
self.h.reset()
def grab_image(self, show=False):
"""Fetch buffer and returns the image. If unable to fetch the buffer, a None object is returned"""
buffer = self.camera.try_fetch(timeout=10)
if buffer is None:
return None # return empty image to Kivy app
payload = buffer.payload
component = payload.components[0]
width = component.width
height = component.height
data_format = component.data_format
# Reshape the image so that it can be drawn on the VisPy canvas:
if data_format in mono_location_formats:
img = component.data.reshape(height, width)
else:
# The image requires you to reshape it to draw it on the canvas:
if data_format in rgb_formats or data_format in rgba_formats or data_format in bgr_formats or data_format in bgra_formats:
img = component.data.reshape(height, width,
int(component.num_components_per_pixel)) # Set of R, G, B, and Alpha
if data_format in bgr_formats:
# Swap every R and B:
img = img[:, :, ::-1]
elif data_format == 'BayerRG8':
img = component.data.reshape(height, width)
cv2.cvtColor(src=img, code=cv2.COLOR_BayerRG2GRAY, dst=img)
image = img.copy()
if show:
win_name = 'debug'
cv2_open_resized_window(img=image, win_name=win_name, width=WIDTH, height=HEIGHT)
cv2.setWindowProperty(win_name, cv2.WND_PROP_TOPMOST, 1)
cv2.imshow(win_name, image)
cv2.waitKey(0)
cv2.destroyWindow(win_name)
buffer.queue()
return image
def set_parameters(self, image_format, exposure_time, gain_raw, fps):
self.camera.remote_device.node_map.autoBrightnessMode.value = 'Off'
self.camera.remote_device.node_map.PixelFormat.value = image_format
self.camera.remote_device.node_map.AcquisitionFrameRate.value = fps
self.camera.remote_device.node_map.GainRaw.value = gain_raw
self.camera.remote_device.node_map.ExposureTime.value = exposure_time
Complete Traceback error:
>>> self.camera.stop()
Traceback (most recent call last):
File "/home/pi/.local/share/virtualenvs/GUIv2-HIklSUks/lib/python3.7/site-packages/kivy/base.py", line 574, in runTouchApp
EventLoop.mainloop()
File "/home/pi/.local/share/virtualenvs/GUIv2-HIklSUks/lib/python3.7/site-packages/kivy/base.py", line 339, in mainloop
self.idle()
File "/home/pi/.local/share/virtualenvs/GUIv2-HIklSUks/lib/python3.7/site-packages/kivy/base.py", line 379, in idle
Clock.tick()
File "/home/pi/.local/share/virtualenvs/GUIv2-HIklSUks/lib/python3.7/site-packages/kivy/clock.py", line 733, in tick
self.post_idle(ts, self.idle())
File "/home/pi/.local/share/virtualenvs/GUIv2-HIklSUks/lib/python3.7/site-packages/kivy/clock.py", line 776, in post_idle
self._process_events()
File "kivy/_clock.pyx", line 620, in kivy._clock.CyClockBase._process_events
File "kivy/_clock.pyx", line 653, in kivy._clock.CyClockBase._process_events
File "kivy/_clock.pyx", line 649, in kivy._clock.CyClockBase._process_events
File "kivy/_clock.pyx", line 218, in kivy._clock.ClockEvent.tick
File "/home/pi/Desktop/GUIv2/ChainTrakingGUI.py", line 73, in callback
Cam.connect()
File "/home/pi/Desktop/GUIv2/src/monocular_marker_tracking/camera.py", line 64, in connect
self.camera.start()
File "/home/pi/.local/share/virtualenvs/GUIv2-HIklSUks/lib/python3.7/site-packages/harvesters/core.py", line 2120, in start
ACQ_START_FLAGS_LIST.ACQ_START_FLAGS_DEFAULT, -1)
File "/home/pi/.local/share/virtualenvs/GUIv2-HIklSUks/lib/python3.7/site-packages/harvesters/core.py", line 214, in m
return getattr(self._source_object, attribute)(*args)
File "/home/pi/.local/share/virtualenvs/GUIv2-HIklSUks/lib/python3.7/site-packages/genicam/gentl.py", line 3838, in start_acquisition
return _gentl.DataStream_start_acquisition(self, *args)
_gentl.ResourceInUseException: GenTL exception: Requested resource is already in use. (Message from the source: ) (ID: -1004)
Expected Behavior
Being able to restart the camera when needed in order to restart acquire images properly.
Configuration
- OS: Raspbian 32 bit
- Python: Python 3.7
- Harvester: 1.3.8
- GenTL Producer: static.matrix-vision.com/mvIMPACT_Acquire/2.46.2/install_mvGenTL_Acquire_ARM.sh
- Camera: Teledyne DALSA Nano - M2420
Reproducibility
This phenomenon can be stably reproduced:
- [X ] Yes
- No.
Actions You Have Taken
-
Since the try_fetch() returns None, I tried to skip a callback when the buffer is not returned with a try except. However, the camera stays in the same state and cannot fetch a buffer anymore.
-
I tried to clear the buffer as in #383 but it does not seem to work.
def set_parameters(self, image_format, exposure_time, gain_raw, fps):
self.camera.remote_device.node_map.BalanceWhiteAuto.value = 'Off'
self.camera.remote_device.node_map.AcquisitionMode.value = "Continuous"
self.camera.remote_device.node_map.TriggerSelector.value = 'FrameStart'
self.camera.remote_device.node_map.TriggerActivation.set_value('RisingEdge')
self.camera.remote_device.node_map.TriggerMode.value = 'On'
self.camera.remote_device.node_map.TriggerSource.value = 'Software'
self.camera.remote_device.node_map.autoBrightnessMode.value = 'Off'
self.camera.remote_device.node_map.PixelFormat.value = image_format
self.camera.remote_device.node_map.AcquisitionFrameRate.value = fps
self.camera.remote_device.node_map.GainRaw.value = gain_raw
self.camera.remote_device.node_map.ExposureTime.value = exposure_time
- I tried to reset the device getting the following:
Traceback (most recent call last):
File "/opt/pycharm/plugins/python-ce/helpers/pydev/_pydevd_bundle/pydevd_exec2.py", line 3, in Exec
exec(exp, global_vars, local_vars)
File "<input>", line 1, in <module>
File "/home/pi/.local/share/virtualenvs/GUIv2-HIklSUks/lib/python3.7/site-packages/genicam/genapi.py", line 2796, in execute
return _genapi.ICommand_execute(self, Verify)
File "/home/pi/.local/share/virtualenvs/GUIv2-HIklSUks/lib/python3.7/site-packages/harvesters/_private/core/port.py", line 54, in write
self.port.write(address, value)
File "/home/pi/.local/share/virtualenvs/GUIv2-HIklSUks/lib/python3.7/site-packages/genicam/gentl.py", line 5016, in write
return _gentl.Port_write(self, address, buffer)
_gentl.AccessDeniedException: GenTL exception: Requested operation is not allowed. (Message from the source: No write access to device Nano-M2420(00:01:0d:c6:2c:c5)(current access DEVICE_ACCESS_STATUS_OPEN_READONLY)) (ID: -1005)
-
If I force the stop of the program and restart it the camera is reset to its original status.
-
I've read the Harvester FAQ page.
Additional context
I am running my code on a Kivy (version 2.1.0) app. try_fetch() is called with a callback managed by the Clock class implemented in Kivy every 60 seconds.
AndreaMazzoleniOOI commented
EDIT:
Actions You Have Taken
-
Since the try_fetch() returns None, I tried to skip a callback when the buffer is not returned with a try-except. However, the camera stays in the same state and cannot fetch a buffer anymore.
-
I tried to clear the buffer as in #383 but it does not seem to work.
def set_parameters(self, image_format, exposure_time, gain_raw, fps):
self.camera.remote_device.node_map.BalanceWhiteAuto.value = 'Off'
self.camera.remote_device.node_map.AcquisitionMode.value = "Continuous"
self.camera.remote_device.node_map.TriggerSelector.value = 'FrameStart'
self.camera.remote_device.node_map.TriggerActivation.value = 'RisingEdge'
self.camera.remote_device.node_map.TriggerMode.value = 'On'
self.camera.remote_device.node_map.TriggerSource.value = 'Software'
self.camera.remote_device.node_map.autoBrightnessMode.value = 'Off'
self.camera.remote_device.node_map.PixelFormat.value = image_format
self.camera.remote_device.node_map.AcquisitionFrameRate.value = fps
self.camera.remote_device.node_map.GainRaw.value = gain_raw
self.camera.remote_device.node_map.ExposureTime.value = exposure_time
Which raise the following:
Traceback (most recent call last):
File "/home/pi/Desktop/GUIv2/ChainTrakingGUI.py", line 304, in <module>
Cam = init_camera(config)
File "/home/pi/Desktop/GUIv2/ChainTrakingGUI.py", line 281, in init_camera
cam = GenieNanoCamera()
File "/home/pi/Desktop/GUIv2/src/monocular_marker_tracking/camera.py", line 58, in __init__
self.set_parameters(image_format='Mono8', exposure_time=50000, gain_raw=0, fps=9)
File "/home/pi/Desktop/GUIv2/src/monocular_marker_tracking/camera.py", line 127, in set_parameters
self.camera.remote_device.node_map.TriggerActivation.value = 'RisingEdge'
File "/home/pi/.local/share/virtualenvs/GUIv2-HIklSUks/lib/python3.7/site-packages/genicam/genapi.py", line 2650, in <lambda>
__setattr__ = lambda self, name, value: _swig_setattr(self, IEnumeration, name, value)
File "/home/pi/.local/share/virtualenvs/GUIv2-HIklSUks/lib/python3.7/site-packages/genicam/genapi.py", line 101, in _swig_setattr
return _swig_setattr_nondynamic(self, class_type, name, value, 0)
File "/home/pi/.local/share/virtualenvs/GUIv2-HIklSUks/lib/python3.7/site-packages/genicam/genapi.py", line 93, in _swig_setattr_nondynamic
object.__setattr__(self, name, value)
File "/home/pi/.local/share/virtualenvs/GUIv2-HIklSUks/lib/python3.7/site-packages/genicam/genapi.py", line 2714, in _set_value
self.from_string(value)
File "/home/pi/.local/share/virtualenvs/GUIv2-HIklSUks/lib/python3.7/site-packages/genicam/genapi.py", line 1437, in from_string
return _genapi.IValue_from_string(self, ValueStr, Verify)
_genapi.AccessException: Node is not writable. : AccessException thrown in node 'TriggerActivation' while calling 'TriggerActivation.FromString()' (file 'ValueT.h', line 86)
- I tried to reset the device with remote_device.node_map.DeviceReset.execute() getting the following:
File "/opt/pycharm/plugins/python-ce/helpers/pydev/_pydevd_bundle/pydevd_exec2.py", line 3, in Exec
exec(exp, global_vars, local_vars)
File "<input>", line 1, in <module>
File "/home/pi/.local/share/virtualenvs/GUIv2-HIklSUks/lib/python3.7/site-packages/genicam/genapi.py", line 2796, in execute
return _genapi.ICommand_execute(self, Verify)
File "/home/pi/.local/share/virtualenvs/GUIv2-HIklSUks/lib/python3.7/site-packages/harvesters/_private/core/port.py", line 54, in write
self.port.write(address, value)
File "/home/pi/.local/share/virtualenvs/GUIv2-HIklSUks/lib/python3.7/site-packages/genicam/gentl.py", line 5016, in write
return _gentl.Port_write(self, address, buffer)
_gentl.AccessDeniedException: GenTL exception: Requested operation is not allowed. (Message from the source: No write access to device Nano-M2420(00:01:0d:c6:2c:c5)(current access DEVICE_ACCESS_STATUS_OPEN_READONLY)) (ID: -1005)
- If I force the stop of the program and restart it the camera is reset to its original status.