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import six
import warnings
from nd2reader.common import get_from_dict_if_exists
def parse_if_not_none(to_check, callback):
if to_check is not None:
return callback()
return None
def parse_dimension_text_line(line):
if six.b("Dimensions:") in line:
entries = line.split(six.b("\r\n"))
for entry in entries:
if entry.startswith(six.b("Dimensions:")):
return entry
return None
def parse_roi_shape(shape):
if shape == 3:
return 'rectangle'
elif shape == 9:
return 'circle'
return None
def parse_roi_type(type_no):
if type_no == 4:
return 'stimulation'
elif type_no == 3:
return 'reference'
elif type_no == 2:
return 'background'
return None
def get_loops_from_data(loop_data):
# special ND experiment
if six.b('pPeriod') not in loop_data:
return []
if six.b('uiPeriodCount') in loop_data and loop_data[six.b('uiPeriodCount')] > 0:
loops = []
for i, period in enumerate(loop_data[six.b('pPeriod')]):
# exclude invalid periods
if six.b('pPeriodValid') in loop_data:
try:
if loop_data[six.b('pPeriodValid')][i] == 1:
loops.append(loop_data[six.b('pPeriod')][period])
except IndexError:
continue
else:
# we can't be sure, append all
loops.append(loop_data[six.b('pPeriod')][period])
return [loop_data]
def guess_sampling_from_loops(duration, loop):
""" In some cases, both keys are not saved. Then try to calculate it.
Args:
duration: the total duration of the loop
loop: the raw loop data
Returns:
float: the guessed sampling interval in milliseconds
"""
number_of_loops = get_from_dict_if_exists('uiCount', loop)
number_of_loops = number_of_loops if number_of_loops is not None and number_of_loops > 0 else 1
interval = duration / number_of_loops
return interval
def determine_sampling_interval(duration, loop):
"""Determines the loop sampling interval in milliseconds
Args:
duration: loop duration in milliseconds
loop: loop dictionary
Returns:
float: the sampling interval in milliseconds
"""
interval = get_from_dict_if_exists('dPeriod', loop)
avg_interval = get_from_dict_if_exists('dAvgPeriodDiff', loop)
if interval is None or interval <= 0:
interval = avg_interval
else:
avg_interval_set = avg_interval is not None and avg_interval > 0
if round(avg_interval) != round(interval) and avg_interval_set:
message = ("Reported average frame interval (%.1f ms) doesn't"
" match the set interval (%.1f ms). Using the average"
" now.")
warnings.warn(message % (avg_interval, interval), RuntimeWarning)
interval = avg_interval
if interval is None or interval <= 0:
# In some cases, both keys are not saved. Then try to calculate it.
interval = guess_sampling_from_loops(duration, loop)
return interval