#!/usr/bin/python
# -*- coding: utf-8 -*-
import sys
import traceback
from ptp.PtpUsbTransport import PtpUsbTransport
from ptp.PtpSession import PtpSession, PtpException
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
id = 0
while True:
ptpSession.InitiateCapture(
objectFormatId=PtpValues.StandardObjectFormats.EXIF_JPEG)
objectid = None
while True:
evt = ptpSession.CheckForEvent(None)
if evt == None:
raise Exception("Capture did not complete")
if evt.eventcode == PtpValues.StandardEvents.OBJECT_ADDED:
objectid = evt.params[0]
break
class CHDKPtpCapture:
def __init__(self):
self.autofocuslocked = False
def connect(self):
"""Connects to the first available ptp device, ptpSession is used to access most ptp commands"""
ptps = PtpUsbTransport.findptps()
print ptps
self.ptpTransport = PtpUsbTransport(ptps[0])
self.ptpSession = PtpSession(self.ptpTransport)
self.vendorId = PtpValues.Vendors.STANDARD
self.ptpSession.OpenSession()
self.deviceInfo = self.ptpSession.GetDeviceInfo()
print "ser: " + self.deviceInfo.SerialNumber
self.vendorId = self.deviceInfo.VendorExtensionID
print "model: " + self.deviceInfo.Model
return True
def capture(self):
"""Captures an image and returns it's objectid"""
self.activateShootingMode()
lua_script = "shoot()"
logging.debug("sending script")
executeScript(self.ptpSession,
lua_script,
CHDKPtpValues.ScriptingLanguage.LUA,
wait=True)
logging.debug("script finished")
# below couple of lines in while loop taken from Capture.py of pyptp
objectid = None
while True:
evt = self.ptpSession.CheckForEvent(None)
if evt == None:
raise Exception("Capture did not complete")
if evt.eventcode == PtpValues.StandardEvents.OBJECT_ADDED:
objectid = evt.params[0]
break
return objectid
def activateShootingMode(self):
"""Activates shooting mode on the camera, allowing the camera to shoot while under usb control"""
lua_script = """
switch_mode_usb(1)
rec,vid,mode=get_mode()
while rec == false do
rec,vid,mode=get_mode()
end
"""
executeScript(self.ptpSession,
lua_script,
CHDKPtpValues.ScriptingLanguage.LUA,
wait=True)
def disableFlash(self):
self.activateShootingMode()
lua_script = "set_prop(143,2) -- turns flash off on SX200IS"
executeScript(self.ptpSession,
lua_script,
CHDKPtpValues.ScriptingLanguage.LUA,
wait=True)
def enableAutoFlash(self):
self.activateShootingMode()
lua_script = "set_prop(143,1) -- turns flash to auto on SX200IS"
executeScript(self.ptpSession,
lua_script,
CHDKPtpValues.ScriptingLanguage.LUA,
wait=True)
def lockAutofocus(self):
"""Prevents the camera from autofocusing"""
self.activateShootingMode()
lua_script = "set_aflock(1)"
executeScript(self.ptpSession,
lua_script,
CHDKPtpValues.ScriptingLanguage.LUA,
wait=True)
self.autofocuslocked = True
def unlockAutofocus(self):
"""Allows the camera to autofocus"""
self.activateShootingMode()
lua_script = "set_aflock(0)"
executeScript(self.ptpSession,
lua_script,
CHDKPtpValues.ScriptingLanguage.LUA,
wait=True)
self.autofocuslocked = False
def autofocus(self):
"""Attempts to autofocus the camera"""
self.activateShootingMode()
lua_script = "press('shoot_half')"
executeScript(self.ptpSession,
lua_script,
CHDKPtpValues.ScriptingLanguage.LUA,
wait=True)
time.sleep(
2
) # we must wait for a short time for the autofocus to complete, otherwise if we lockAutofocus right afterwards we can cause the program to lock up
def downloadAndSaveObject(self, objectid, savepath):
file = open(savepath, "w")
self.ptpSession.GetObject(objectid, file)
file.close()
def deleteObject(self, objectid):
self.ptpSession.DeleteObject(objectid)
def getAutofocusLocked(self):
return self.autofocuslocked
