def _prepareImageBuffer(self, numImages=1):
"""
Prepares a bigger buffer for e.g. more than 1 triggered image.
Notes: This function uses a sleep function to guarantee allocated memory.
Parameters
----------
numImages : int
Number of expected images.
Returns
-------
buffer: memory_handle
Memory handle which adresses the allocated buffer memory
"""
# Calculate buffer size
# TODO: bytePerSample may have to be changed when using different pixel formats
samplePerPixel = 1
bytePerSample = 1
nbBuffers = numImages
totalBufferSize = self._width * self._height * samplePerPixel * \
bytePerSample * nbBuffers
buffer = s.Fg_AllocMemEx(self.device, totalBufferSize, nbBuffers)
# Give time to allocate buffer -
# tests without sleep/too short sleep failed
time.sleep(.5)
return buffer
def initialise(self):
totalBufferSize = self.camset.cam_dict['frameformat'][2][
2] * self.camset.cam_dict['frameformat'][2][
3] * self.camset.cam_dict['numpicsbuffer'][2]
self.memHandle = SISO.Fg_AllocMemEx(
self.fg, totalBufferSize, self.camset.cam_dict['numpicsbuffer'][2])
self.display = SISO.CreateDisplay(
8, self.camset.cam_dict['frameformat'][2][2],
self.camset.cam_dict['frameformat'][2][3])
SISO.SetBufferWidth(self.display,
self.camset.cam_dict['frameformat'][2][2],
self.camset.cam_dict['frameformat'][2][3])
fg = s.Fg_InitEx(applet, boardId, 1)
else:
fg = s.Fg_InitEx(applet, boardId, 0)
# error handling
err = s.Fg_getLastErrorNumber(fg)
mes = s.Fg_getErrorDescription(err)
if err < 0:
print("Error", err, ":", mes)
sys.exit()
else:
print("ok")
# allocating memory
memHandle = s.Fg_AllocMemEx(fg, totalBufferSize, nbBuffers)
# Set Applet Parameters
err = s.Fg_setParameterWithInt(fg, s.FG_WIDTH, width, camPort)
if (err < 0):
print("Fg_setParameter(FG_WIDTH) failed: ",
s.Fg_getLastErrorDescription(fg))
s.Fg_FreeMemEx(fg, memHandle)
s.Fg_FreeGrabber(fg)
exit(err)
err = s.Fg_setParameterWithInt(fg, s.FG_HEIGHT, height, camPort)
if (err < 0):
print("Fg_setParameter(FG_HEIGHT) failed: ",
s.Fg_getLastErrorDescription(fg))
s.Fg_FreeMemEx(fg, memHandle)