Source code for lightonopu.device

# Copyright (c) 2020 LightOn, All Rights Reserved.
# This file is subject to the terms and conditions defined in
# file 'LICENSE.txt', which is part of this source code package.
import sys
from builtins import object, TypeError
from contextlib import contextmanager, ExitStack
from enum import Enum
from typing import Union, Tuple, List
import numpy as np

from lightonopu.internal.pidfile import PidFile, ProcessRunningException
from lightonopu.types import OutputRoiStrategy, Roi, Tuple2D

# Default values for hardware parameters
default_frametime_us = 500
default_exposure_us = 400
default_gain_dB = 0.

# for constant. checked for truth when hardware is opened
_input1_shape = (912, 1140)
_output1_shape_max = (1920, 1080)
_output2_shape_max = (2040, 1088)

[docs]class OpuAlreadyUsedException(Exception): """Exception raised when hardware resources for an OPU are already taken""" pass
[docs]class AcqState(Enum): """Acquisition state (see common/include/opu_types.hpp)""" stopped = 1 batch = 2 online = 3
# noinspection PyPep8Naming
[docs]class OpuDevice(object): """ Class for hardware interface with a LightOn OPU. Implements a context manager interface for acquiring access to the OPU, but most properties are gettable and settable even though the OPU isn't active. """ def __init__(self, opu_type: str, frametime_us: int, exposure_us: int, sequence_nb_prelim=0, output_roi: Roi = None, verbose=False, name="opu"): if opu_type == "type1": from . import opu1_pybind self.__opu = opu1_pybind.OPU() self._output_shape_max = _output1_shape_max # With Model1 we just get the ROI in the middle self._output_roi_strategy = OutputRoiStrategy.mid_square self._output_roi_increment = 8 elif opu_type == "type2": from . import opu2_pybind self.__opu = opu2_pybind.OPU() self._output_shape_max = _output2_shape_max # With Model2 we get max width in the middle self._output_roi_strategy = OutputRoiStrategy.mid_width self._output_roi_increment = 1 else: raise TypeError("Don't know this OPU type: " + opu_type) # context for pid file self.pidfile = ExitStack() self.opu_type = opu_type # "off" fields allow to know what to send at resource acquisition # force to int if input is e.g. a float self._frametime_us_off = int(frametime_us) self._exposure_us_off = int(exposure_us) self._gain_dB_off = default_gain_dB self._output_roi_off = output_roi self._reserved_off = 0 self._sequence_nb_prelim = sequence_nb_prelim = name self.verbose = verbose # forward opu interface to class self.transform1 = self.__opu.transform1 self.transform2 = self.__opu.transform2 self.transform_single = self.__opu.transform_single self.transform_online = self.__opu.transform_online if hasattr(self.__opu, "transform_online_test"): self.transform_online_test = self.__opu.transform_online_test
[docs] def open(self): """ Acquires hardware resource. Do nothing if the resource is already acquired in the current object. If the resource isn't available, do 4 retries until it is available, or raise a OPUUsedByOther exception Equivalent is to use context manager interface:: with opu: outs = opu.transform(ins) Raises ------ self.OPUUsedByOther if hardware has already been acquired in another process or object """ # Just return if it's already active if return # A PID file allows to check whether an OPU of this name already runs on the system, # and provide the user with a helpful message try: log = sys.stdout if self.verbose else None warn = sys.stderr if self.verbose else None self.pidfile.enter_context(PidFile("/tmp/lighton-{}.pid".format(, log, warn)) except ProcessRunningException: # "from None" to disable exception chaining, not useful here raise OpuAlreadyUsedException(_already_used_text) from None if self.verbose: print("Opening OPU... ", end='', flush=True) # noinspection PyPep8 try:, self._exposure_us_off, self._sequence_nb_prelim, self.verbose) # check that input&output constants is conform to what the hardware tells if self.input_shape != tuple(self.__opu.input_shape): raise Exception("Incorrect values for internal input shape") if self.output_shape_max != tuple(self.__opu.output_shape_max): raise Exception("Incorrect values for internal max output shape") if self.input_size != self.__opu.input_size: raise Exception("Incorrect values for internal input size") if default_gain_dB != self.__opu.gain_dB: raise Exception("Incorrect defaults for output gain") # sets hardware parameter back self.gain_dB = self._gain_dB_off if self._output_roi_off is not None: self.output_roi = self._output_roi_off if self._reserved_off != 0: self.reserve(self._reserved_off) if self.verbose: print("OK") except: # Cleanup if an exception was thrown try: self.__opu.close() finally: self.pidfile.close() raise
def __enter__(self): return self def __exit__(self, *args): self.close() def close(self): # grab hardware values before closing try: if self._frametime_us_off = self.__opu.frametime_us self._exposure_us_off = self.__opu.exposure_us self._gain_dB_off = self.__opu.gain_dB self._output_roi_off = to_roi(self.__opu.output_roi) self.__opu.close() finally: # In the end make sure the pidfile is released self.pidfile.close() @contextmanager def acquiring(self, triggered=True, online=False): try: if online: self.__opu.start_online_acq(triggered) else: self.__opu.start_acq(triggered) yield finally: self.__opu.stop_acq() @property def active(self): """bool, whether the hardware resources have been acquired""" return @property def input_shape(self) -> Tuple2D: """tuple(int), Shape of the input, in elements and cartesian coordinates """ return _input1_shape @property def output_shape_max(self) -> Tuple2D: """tuple(int): Shape of the whole output (no ROI), in elements and cartesian coordinates""" return self._output_shape_max @property def output_roi_strategy(self) -> OutputRoiStrategy: return self._output_roi_strategy @property def output_roi_increment(self) -> int: return self._output_roi_increment @property def nb_features(self) -> int: """int: Total number of features supported by the OPU""" return self.input_shape[0] * self.input_shape[1] @property def input_size(self) -> int: """int: Input size, in bytes""" return self.nb_features // 8 @property def exposure_us(self) -> int: """int: exposure for output, in microseconds""" return self.__opu.exposure_us if else self._exposure_us_off @property def output_readout_us(self) -> int: """int: time given for readout, in microseconds""" if not raise RuntimeError("The Opu must be active to get this value") return self.__opu.output_readout_us @property def frametime_us(self) -> int: """int: time for which each input display, in microseconds""" return self.__opu.frametime_us if else self._frametime_us_off @frametime_us.setter def frametime_us(self, value): if self.__opu.frametime_us = int(value) else: self._frametime_us_off = int(value) @exposure_us.setter def exposure_us(self, value): if self.__opu.exposure_us = int(value) else: self._exposure_us_off = int(value)
[docs] def reserve(self, n_images): """Does internal allocation of a number of images, necessary for transform2 calls""" if self.__opu.reserve(int(n_images)) else: self._reserved_off = int(n_images)
@property def output_shape(self) -> Tuple2D: """ list(int): Shape of the current output ROI, in elements and cartesian coordinates """ return self.output_roi[1] @property def acq_state(self) -> Union[AcqState, None]: return AcqState(self.__opu.acq_state) if else None @property def output_dtype(self): return np.uint8 @property def output_roi(self) -> Roi: """ tuple(list(int)): offset and size of the current output ROI""" return to_roi(self.__opu.output_roi) if else self._output_roi_off @output_roi.setter def output_roi(self, value: Roi): if # Binding accepts tuple(list(int), list(inst)) self.__opu.output_roi = (list(value[0]), list(value[1])) else: self._output_roi_off = value @property def gain_dB(self) -> float: """ Gain of the output (not implemented in every device)""" return self.__opu.gain_dB if else self._gain_dB_off @gain_dB.setter def gain_dB(self, value): if self.__opu.gain_dB = value else: self._gain_dB_off = value
[docs] def versions(self): """Returns multi-line string with device and libraries versions""" version = [] # device version needs an active OPU if version.append(self.__opu.device_versions()) # this is static so works even if non active version.append(self.__opu.library_versions()) return '\n'.join(version)
def __deepcopy__(self, memo): """ Deep copy of an object Can't make a deep copy of an OPU that represents a hardware resource, However sklearn needs to clone it as an estimator """ return self def __getstate__(self): """Closes and return current state""" state = {"active":, "opu_type": self.opu_type, "frametime_us": self.frametime_us, "exposure_us": self.exposure_us, "gain_dB": self.gain_dB, "output_ROI": self.output_roi, "reserved": self._reserved_off, "verbose": self.verbose} self.close() return state def __setstate__(self, state): """Restore object with given state""" self.__init__(state["opu_type"], state["frametime_us"], state["exposure_us"], state["verbose"]) self.output_roi = state["output_ROI"] self.gain_dB = state["gain_dB"] self._reserved_off = state["reserved"] # If state was active then open OPU if state["active"]: def __str__(self): active = "Active" if else "Inactive" return '{} OPU, frametime {} μs, exposure {} μs, output ROI {}'.format( active, self.frametime_us, self.exposure_us, self.output_roi)
_already_used_text = """ The OPU hardware resources have already been reserved by another OPU or OPUMap object. The options to recover from this are: * shutdown the kernel if it's in a notebook; * call close() on the object when you don't need it anymore, or use the Python "with" statement. """ def to_roi(roi: Tuple[List[int], List[int]]) -> Roi: # Binding returns tuple(list, list), we want tuple(tuple, tuple) # noinspection PyTypeChecker return tuple(roi[0]), tuple(roi[1])