def set_f_number(f_number):
"""Changes the current aperture size when using manual mode.
TODO(jordanhuus): confirm when this works and doesn't work.
Args:
param1 (float): TODO(jordanhuus): determine unit of measurement
"""
ptpTransport = PtpUsbTransport(
PtpUsbTransport.findptps(PtpUsbTransport.USB_CLASS_PTP))
bulk_in, bulk_out, interrupt_in = \
PtpUsbTransport.retrieve_device_endpoints(
PtpUsbTransport.findptps(PtpUsbTransport.USB_CLASS_PTP))
ptpSession = PtpSession(ptpTransport)
vendorId = PtpValues.Vendors.STANDARD
try:
# Open device session
ptpSession.OpenSession()
ptpSession.SetFNumber(f_number)
except PtpException as e:
raise PtpException(
"PTP Exception: %s" %
PtpValues.ResponseNameById(e.responsecode, vendorId), ptpSession,
ptpTransport)
except Exception as e:
raise Exception(e)
# Close the session
del ptpSession
del ptpTransport
from ptp import PtpValues
ptpTransport = PtpUsbTransport(PtpUsbTransport.findptps()[0])
ptpSession = PtpSession(ptpTransport)
vendorId = PtpValues.Vendors.STANDARD
try:
ptpSession.OpenSession()
deviceInfo = ptpSession.GetDeviceInfo()
vendorId = deviceInfo.VendorExtensionID
# Read all the possible fstops
fstops = ptpSession.GetDevicePropInfo(
PtpValues.StandardProperties.F_NUMBER).Enumeration
for fstop in fstops:
ptpSession.SetFNumber(fstop)
print "Capturing %i" % fstop
ptpSession.InitiateCapture(
objectFormatId=PtpValues.StandardObjectFormats.EXIF_JPEG)
while True:
evt = ptpSession.CheckForEvent(None)
if evt.eventcode == PtpValues.StandardEvents.OBJECT_ADDED:
break
except PtpException, e:
print "PTP Exception: %s" % PtpValues.ResponseNameById(
e.responsecode, vendorId)
except Exception, e:
print "An exception occurred: %s" % e
traceback.print_exc()
def get_f_number_options():
"""TODO(jordanhuus): add doc string
"""
ptpTransport = PtpUsbTransport(
PtpUsbTransport.findptps(PtpUsbTransport.USB_CLASS_PTP))
bulk_in, bulk_out, interrupt_in = \
PtpUsbTransport.retrieve_device_endpoints(
PtpUsbTransport.findptps(PtpUsbTransport.USB_CLASS_PTP))
ptpSession = PtpSession(ptpTransport)
vendorId = PtpValues.Vendors.STANDARD
minimum_f_stop = None
maximum_f_stop = None
f_stop_type_index = None
try:
# Open device session
ptpSession.OpenSession()
# Available f-stop values
# Start with the most granular option (1/3rd stops)
f_numbers_third_stops = [
100, 110, 120, 140, 160, 180, 200, 220, 250, 280, 320, 350, 400,
450, 500, 560, 630, 710, 800, 900, 1000, 1100, 1300, 1400, 1600,
1800, 2000, 2200, 2500, 2900, 3200, 3600
]
f_numbers_half_stops = [
100, 120, 140, 170, 200, 240, 280, 330, 400, 480, 560, 670, 800,
950, 1100, 1300, 1600, 1900, 2200, 2700, 3200
]
f_numbers_full_stops = [
100, 140, 200, 280, 400, 560, 800, 1100, 1600, 2200, 3200
]
f_stops = [
f_numbers_third_stops, f_numbers_half_stops, f_numbers_full_stops
]
# Attempt to find min/max f-stop values
for i in range(len(f_stops)):
if minimum_f_stop and maximum_f_stop:
break
# Find min
for f_number in f_stops[i]:
try:
ptpSession.SetFNumber(f_number)
if not minimum_f_stop:
minimum_f_stop = f_number
f_stop_type_index = i
break
except PtpException as ptpe:
if ptpe.args[0] == 8220:
continue
# Find max
for f_number in f_stops[i][::-1]:
try:
ptpSession.SetFNumber(f_number)
if not maximum_f_stop:
maximum_f_stop = f_number
f_stop_type_index = i
break
except PtpException as ptpe:
if ptpe.args[0] == 8220:
continue
except PtpException as e:
raise PtpException(
"PTP Exception: %s" %
PtpValues.ResponseNameById(e.responsecode, vendorId), ptpSession,
ptpTransport)
except Exception as e:
raise Exception(e)
# Close the session
del ptpSession
del ptpTransport
if f_stop_type_index == 0:
f_stop_type = "third_stops"
elif f_stop_type_index == 1:
f_stop_type = "half_stops"
elif f_stop_type_index == 2:
f_stop_type = "full_stops"
return (f_stop_type, f_stops[f_stop_type_index].index(minimum_f_stop),
f_stops[f_stop_type_index].index(maximum_f_stop))