python-pymtp 0.0.6-1.1 / usr / lib / python2.7 / dist-packages / pymtp.py

#!/usr/bin/env python
#
# A Ctypes wrapper to LibMTP
# Developed by: Nick Devito (nick@nick125.com)
# (c) 2008 Nick Devito
# Released under the GPLv3 or later.
#

"""
	PyMTP is a pythonic wrapper around libmtp, making it a bit more 
	friendly to use in python

	Example Usage (or see examples/):
		>>> import pymtp
		>>> mtp = pymtp.MTP()
	        >>> mtp.connect()
		PTP: Opening session
	        >>> print mtp.get_devicename()
	        Device name
	        >>> mtp.disconnect()
		PTP: Closing session
		>>>
"""

__VERSION__ = "0.0.5"
__VERSION_MACRO__ = 5
__VERSION_MINOR__ = 0
__VERSION_MAJOR__ = 0
__VERSION_TUPLE__ = (__VERSION_MAJOR__, __VERSION_MINOR__, __VERSION_MACRO__)
__AUTHOR__ = "Nick Devito (nick@nick125.com)"
__LICENSE__ = "GPL-3"
__DEBUG__ = 1

import os
import ctypes
import ctypes.util

# NOTE: This code *may* work on windows, I don't have a win32 system to test
# this on. 
_module_path = ctypes.util.find_library("mtp") 
_libmtp = ctypes.CDLL(_module_path)

# ----------
# Error Definitions
# ----------
class NoDeviceConnected(Exception): 
	"""
		Raised when there isn't a device connected to the USB bus 
	"""

	pass

class AlreadyConnected(Exception):
	"""
		Raised when we're already connected to a device and there is 
		an attempt to connect
	"""

	pass
	
class UnsupportedCommand(Exception): 
	"""
		Raised when the connected device does not support the command 
		issued
	"""

	pass

class CommandFailed(Exception): 
	"""
		Raised when the connected device returned an error when trying 
		to execute a command
	"""

	pass

class NotConnected(Exception): 
	"""
		Raised when a command is called and the device is not connected
	"""

	pass

class ObjectNotFound(Exception):
	"""
		Raised when a command tries to get an object that doesn't exist
	"""

	pass

# ----------
# End Error Definitions
# ----------

# ----------
# Data Model Definitions
# ----------

class LIBMTP_Error(ctypes.Structure):
	"""
		LIBMTP_Error
		Contains the ctypes structure for LIBMTP_error_t
	"""

	def __repr__(self):
		return self.errornumber

LIBMTP_Error._fields_ = [("errornumber", ctypes.c_int),
                         ("error_text", ctypes.c_char_p),
                         ("next", ctypes.POINTER(LIBMTP_Error))]

class LIBMTP_DeviceStorage(ctypes.Structure):
	"""
		LIBMTP_DeviceStorage
		Contains the ctypes structure for LIBMTP_devicestorage_t
	"""

	def __repr__(self):
		return self.id

LIBMTP_DeviceStorage._fields_ = [("id", ctypes.c_uint32),
                                 ("StorageType", ctypes.c_uint16),
                                 ("FilesystemType", ctypes.c_uint16),
                                 ("AccessCapability", ctypes.c_uint16),
                                 ("MaxCapacity", ctypes.c_uint64),
                                 ("FreeSpaceInBytes", ctypes.c_uint64),
                                 ("FreeSpaceInObjects", ctypes.c_uint64),
                                 ("StorageDescription", ctypes.c_char_p),
                                 ("VolumeIdentifier", ctypes.c_char_p),
                                 ("next", ctypes.POINTER(LIBMTP_DeviceStorage)),
                                 ("prev", ctypes.POINTER(LIBMTP_DeviceStorage))]

class LIBMTP_DeviceEntry(ctypes.Structure):
	"""
		LIBMTP_DeviceEntry
		Contains the ctypes structure for LIBMTP_device_entry_t
	"""

	def __repr__(self):
		return self.vendor

LIBMTP_DeviceEntry._fields_ = [("vendor", ctypes.c_char_p),
			       ("vendor_id", ctypes.c_uint16),
			       ("product", ctypes.c_char_p),
			       ("product_id", ctypes.c_uint16),
			       ("device_flags", ctypes.c_uint32)]

class LIBMTP_RawDevice(ctypes.Structure):
	"""
		LIBMTP_RawDevice
		Contains the ctypes structure for LIBMTP_raw_device_t
	"""

	def __repr__(self):
		return self.device_entry

LIBMTP_RawDevice._fields_ = [("device_entry", LIBMTP_DeviceEntry),
			     ("bus_location", ctypes.c_uint32),
			     ("devnum", ctypes.c_uint8)]

class LIBMTP_MTPDevice(ctypes.Structure):
	"""
		LIBMTP_MTPDevice
		Contains the ctypes structure for LIBMTP_mtpdevice_t
	"""

	def __repr__(self):
		return self.interface_number

LIBMTP_MTPDevice._fields_ = [("interface_number", ctypes.c_uint8),
                             ("params", ctypes.c_void_p),
                             ("usbinfo", ctypes.c_void_p),
                             ("storage", ctypes.POINTER(LIBMTP_DeviceStorage)),
                             ("errorstack", ctypes.POINTER(LIBMTP_Error)),
                             ("maximum_battery_level", ctypes.c_uint8),
                             ("default_music_folder", ctypes.c_uint32),
                             ("default_playlist_folder", ctypes.c_uint32),
                             ("default_picture_folder", ctypes.c_uint32),
                             ("default_video_folder", ctypes.c_uint32),
                             ("default_organizer_folder", ctypes.c_uint32),
                             ("default_zencast_folder", ctypes.c_uint32),
                             ("default_album_folder", ctypes.c_uint32),
                             ("default_text_folder", ctypes.c_uint32),
                             ("cd", ctypes.c_void_p),
                             ("next", ctypes.POINTER(LIBMTP_MTPDevice))]

class LIBMTP_File(ctypes.Structure):
	"""
		LIBMTP_File
		Contains the ctypes structure for LIBMTP_file_t
	"""

	def __repr__(self):
		return "%s (%s)" % (self.filename, self.item_id)

LIBMTP_File._fields_ = [("item_id", ctypes.c_uint32),
                        ("parent_id", ctypes.c_uint32),
                        ("storage_id", ctypes.c_uint32),
                        ("filename", ctypes.c_char_p),
                        ("filesize", ctypes.c_uint64),
                        ("modificationdate", ctypes.c_uint64),
			("filetype", ctypes.c_int), # LIBMTP_filetype_t enum
			("next", ctypes.POINTER(LIBMTP_File))]

class LIBMTP_Track(ctypes.Structure):
	"""
		LIBMTP_Track
		Contains the ctypes structure for LIBMTP_track_t
	"""

	def __repr__(self):
		return "%s - %s (%s)" % (self.artist, self.title, self.item_id)
		
LIBMTP_Track._fields_ = [("item_id", ctypes.c_uint32),
			("parent_id", ctypes.c_uint32),
                        ("storage_id", ctypes.c_uint32),
			("title", ctypes.c_char_p),
			("artist", ctypes.c_char_p),
			("composer", ctypes.c_char_p), 
			("genre", ctypes.c_char_p),
			("album", ctypes.c_char_p),
			("date", ctypes.c_char_p),
			("filename", ctypes.c_char_p),
			("tracknumber", ctypes.c_uint16),
			("duration", ctypes.c_uint32),
			("samplerate", ctypes.c_uint32),
			("nochannels", ctypes.c_uint16),
			("wavecodec", ctypes.c_uint32),
			("bitrate", ctypes.c_uint32),
			("bitratetype", ctypes.c_uint16),
			("rating", ctypes.c_uint16),
			("usecount", ctypes.c_uint32),
			("filesize", ctypes.c_uint64),
                        ("modificationdate", ctypes.c_uint64),
			("filetype", ctypes.c_int), # LIBMTP_filetype_t enum
			("next", ctypes.POINTER(LIBMTP_Track))]

class LIBMTP_Playlist(ctypes.Structure):
	"""
		LIBMTP_Playlist
		Contains the ctypes structure for LIBMTP_playlist_t
	"""

	def __init__(self):
		self.tracks = ctypes.pointer(ctypes.c_uint32(0))
		self.no_tracks = ctypes.c_uint32(0)
	def __repr__(self):
		return "%s (%s)" % (self.name, self.playlist_id)

	def __iter__(self):
		"""
			This allows the playlist object to act like a list with
			a generator.
		"""
		for track in xrange(self.no_tracks):
			yield self.tracks[track]

	def __getitem__(self, key):
		"""
			This allows the playlist to return tracks like a list
		"""

		if (key > (self.no_tracks - 1)):
			raise IndexError

		return self.tracks[key]

	def __setitem__(self, key, value):
		"""
			This allows the user to manipulate the playlist like a 
			list. However, this will only modify existing objects, 
			you can't try to set a key outside of the current size.
		"""

		if (key > (self.no_tracks - 1)):
			raise IndexError

		self.tracks[key] = value

	def __delitem__(self, key):
		"""
			This allows the user to delete an object
			from the playlist
		"""

		if (key > (self.no_tracks - 1)):
			raise IndexError

		for i in range(key, (self.no_tracks - 1)):
			self.tracks[i] = self.tracks[i + 1]

		self.no_tracks -= 1
	
	def append(self, value):
		"""
			This function appends a track to the end of the tracks
			list.
		"""
		if (self.tracks == None):
			self.tracks = ctypes.pointer(ctypes.c_uint32(0))

		self.no_tracks += 1
		self.tracks[(self.no_tracks - 1)] = value

	def __len__(self):
		"""
			This returns the number of tracks in the playlist
		"""

		return self.no_tracks

LIBMTP_Playlist._fields_ = [("playlist_id", ctypes.c_uint32),
                            ("parent_id", ctypes.c_uint32),
                            ("storage_id", ctypes.c_uint32),
                            ("name", ctypes.c_char_p),
                            ("tracks", ctypes.POINTER(ctypes.c_uint32)),
                            ("no_tracks", ctypes.c_uint32),
                            ("next", ctypes.POINTER(LIBMTP_Playlist))]

class LIBMTP_Folder(ctypes.Structure):
	"""
		LIBMTP_Folder
		Contains the ctypes structure for LIBMTP_folder_t
	"""

	def __repr__(self):
		return "%s (%s)" % (self.name, self.folder_id)

LIBMTP_Folder._fields_ = [("folder_id", ctypes.c_uint32),
                          ("parent_id", ctypes.c_uint32),
                          ("storage_id", ctypes.c_uint32),
                          ("name", ctypes.c_char_p),
                          ("sibling", ctypes.POINTER(LIBMTP_Folder)),
                          ("child", ctypes.POINTER(LIBMTP_Folder))]

# Abstracted from libmtp's LIBMTP_filetype_t. This must be kept in sync.
#  first checked in 0.2.6.1
#  last checked in version 1.1.6
LIBMTP_Filetype = {
	"WAV":			ctypes.c_int(0),
	"MP3":			ctypes.c_int(1),
	"WMA":			ctypes.c_int(2),
	"OGG":			ctypes.c_int(3),
	"AUDIBLE":		ctypes.c_int(4),
	"MP4":			ctypes.c_int(5),
	"UNDEF_AUDIO":		ctypes.c_int(6),	
	"WMV":			ctypes.c_int(7),
	"AVI":			ctypes.c_int(8),
	"MPEG":			ctypes.c_int(9),
	"ASF":			ctypes.c_int(10),
	"QT":			ctypes.c_int(11),
	"UNDEF_VIDEO":		ctypes.c_int(12),
	"JPEG":			ctypes.c_int(13),
	"JFIF":			ctypes.c_int(14),
	"TIFF":			ctypes.c_int(15),
	"BMP":			ctypes.c_int(16),
	"GIF":			ctypes.c_int(17),
	"PICT":			ctypes.c_int(18),
	"PNG":			ctypes.c_int(19),
	"VCALENDAR1":		ctypes.c_int(20),
	"VCALENDAR2":		ctypes.c_int(21),
	"VCARD2":		ctypes.c_int(22),
	"VCARD3":		ctypes.c_int(23),
	"WINDOWSIMAGEFORMAT":	ctypes.c_int(24),
	"WINEXEC":		ctypes.c_int(25),
	"TEXT":			ctypes.c_int(26),
	"HTML":			ctypes.c_int(27),
	"FIRMWARE":		ctypes.c_int(28),
	"AAC":			ctypes.c_int(29),
	"MEDIACARD":		ctypes.c_int(30),
	"FLAC":			ctypes.c_int(31),
	"MP2":			ctypes.c_int(32),
	"M4A":			ctypes.c_int(33),
	"DOC":			ctypes.c_int(34),
	"XML":			ctypes.c_int(35),
	"XLS":			ctypes.c_int(36),
	"PPT":			ctypes.c_int(37),
	"MHT":			ctypes.c_int(38),
	"JP2":			ctypes.c_int(39),
	"JPX":			ctypes.c_int(40),
	"ALBUM":		ctypes.c_int(41),
	"PLAYLIST":		ctypes.c_int(42),
	"UNKNOWN":		ctypes.c_int(43),
}

# Synced from libmtp 0.2.6.1's libmtp.h. Must be kept in sync.
LIBMTP_Error_Number = {
	"NONE":			ctypes.c_int(0),
	"GENERAL":		ctypes.c_int(1),
	"PTP_LAYER":		ctypes.c_int(2),
	"USB_LAYER":		ctypes.c_int(3),
	"MEMORY_ALLOCATION":	ctypes.c_int(4),
	"NO_DEVICE_ATTACHED":	ctypes.c_int(5),
	"STORAGE_FULL":		ctypes.c_int(6),
	"CONNECTING":		ctypes.c_int(7),
	"CANCELLED":		ctypes.c_int(8),
}

# ----------
# End Data Model Definitions
# ----------

# ----------
# Type Definitions
# ----------
_libmtp.LIBMTP_Detect_Raw_Devices.restype = ctypes.c_int # actually LIBMTP_Error_Number enum
_libmtp.LIBMTP_Get_Friendlyname.restype = ctypes.c_char_p
_libmtp.LIBMTP_Get_Serialnumber.restype = ctypes.c_char_p
_libmtp.LIBMTP_Get_Modelname.restype = ctypes.c_char_p
_libmtp.LIBMTP_Get_Manufacturername.restype = ctypes.c_char_p
_libmtp.LIBMTP_Get_Deviceversion.restype = ctypes.c_char_p
_libmtp.LIBMTP_Get_Filelisting_With_Callback.restype = ctypes.POINTER(LIBMTP_File)
_libmtp.LIBMTP_Get_Tracklisting_With_Callback.restype = ctypes.POINTER(LIBMTP_Track)
_libmtp.LIBMTP_Get_Filetype_Description.restype = ctypes.c_char_p
_libmtp.LIBMTP_Get_Filemetadata.restype = ctypes.POINTER(LIBMTP_File)
_libmtp.LIBMTP_Get_Trackmetadata.restype = ctypes.POINTER(LIBMTP_Track)
_libmtp.LIBMTP_Get_First_Device.restype = ctypes.POINTER(LIBMTP_MTPDevice)
_libmtp.LIBMTP_Get_Playlist_List.restype = ctypes.POINTER(LIBMTP_Playlist)
_libmtp.LIBMTP_Get_Playlist.restype = ctypes.POINTER(LIBMTP_Playlist)
_libmtp.LIBMTP_Get_Folder_List.restype = ctypes.POINTER(LIBMTP_Folder)
_libmtp.LIBMTP_Find_Folder.restype = ctypes.POINTER(LIBMTP_Folder)
_libmtp.LIBMTP_Get_Errorstack.restype = ctypes.POINTER(LIBMTP_Error)
# This is for callbacks with the type of LIBMTP_progressfunc_t
Progressfunc = ctypes.CFUNCTYPE(ctypes.c_void_p, ctypes.c_uint64, ctypes.c_uint64)

# ----------
# End Type Definitions
# ----------

class MTP:
	"""
		The MTP object 
		This is the main wrapper around libmtp
	"""

	def __init__(self):
		""" 
			Initializes the MTP object

			@rtype: None
			@return: None
		"""

		self.mtp = _libmtp
		self.mtp.LIBMTP_Init()
		self.device = None

	def debug_stack(self):
		"""
			Checks if __DEBUG__ is set, if so, prints and clears the
			errorstack.

			@rtype: None
			@return: None
		"""

		if __DEBUG__:
			self.mtp.LIBMTP_Dump_Errorstack()
			#self.mtp.LIBMTP_Clear_Errorstack()

	def detect_devices(self):
		"""
			Detect if any MTP devices are connected

			@rtype: None
			@return: a list of LIBMTP_RawDevice instances for devices found

		"""

		devlist = []
		device = LIBMTP_RawDevice()
		devices = ctypes.pointer(device)
		numdevs = ctypes.c_int(0)
		err = self.mtp.LIBMTP_Detect_Raw_Devices(ctypes.byref(devices),
							 ctypes.byref(numdevs))
		if err == LIBMTP_Error_Number['NO_DEVICE_ATTACHED']:
			return devlist
		elif err == LIBMTP_Error_Number['STORAGE_FULL']:
			# ignore this, we're just trying to detect here, not do anything else
			pass
		elif err == LIBMTP_Error_Number['CONNECTING']:
			raise AlreadyConnected('CONNECTING')
		elif err == LIBMTP_Error_Number['GENERAL']:
			raise CommandFailed('GENERAL')
		elif err == LIBMTP_Error_Number['PTP_LAYER']:
			raise CommandFailed('PTP_LAYER')
		elif err == LIBMTP_Error_Number['USB_LAYER']:
			raise CommandFailed('USB_LAYER')
		elif err == LIBMTP_Error_Number['MEMORY_ALLOCATION']:
			raise CommandFailed('MEMORY_ALLOCATION')
		elif err == LIBMTP_Error_Number['CANCELLED']:
			raise CommandFailed('CANCELLED')
		if numdevs.value == 0:
			return devlist
		for i in range(numdevs.value):
			devlist.append(devices[i])
		return devlist

	def connect(self):
		"""
			Initializes the MTP connection to the device 

			@rtype: None
			@return: None

		"""

		if (self.device != None):
			raise AlreadyConnected

		self.device = self.mtp.LIBMTP_Get_First_Device()

		if not self.device:
			self.device = None
			raise NoDeviceConnected
			
	def disconnect(self):
		"""
			Disconnects the MTP device and deletes the self.device object

			@rtype: None
			@return: None
		"""

		if (self.device == None):
			raise NotConnected

		self.mtp.LIBMTP_Release_Device(self.device)
		del self.device
		self.device = None

	def get_devicename(self):
		"""
			Returns the connected device's 'friendly name' (or 
			known as the owner name)

			@rtype: string
			@return: The connected device's 'friendly name'
		"""

		if (self.device == None): 
			raise NotConnected

		return self.mtp.LIBMTP_Get_Friendlyname(self.device)
		
	def set_devicename(self, name):
		"""
			Changes the connected device's 'friendly name' to name

			@type name: string
			@param name: The name to change the connected device's
			 'friendly name' to
			@rtype: None
			@return: None
		"""

		if (self.device == None):
			raise NotConnected

		ret = self.mtp.LIBMTP_Set_Friendlyname(self.device, name)
		if (ret != 0):
			self.debug_stack()
			raise CommandFailed

	def get_serialnumber(self):
		"""
			Returns the connected device's serial number

			@rtype: string
			@return: The connected device's serial number
		"""

		if (self.device == None):
			raise NotConnected

		return self.mtp.LIBMTP_Get_Serialnumber(self.device)

	def get_manufacturer(self):
		"""
			Return the connected device's manufacturer

			@rtype: string
			@return: The connected device's manufacturer
		"""
		if (self.device == None):
			raise NotConnected

		return self.mtp.LIBMTP_Get_Manufacturername(self.device)

	def get_batterylevel(self):
		"""
			Returns the connected device's maximum and current 
			battery levels

			@rtype: tuple
			@return: The connected device's maximum and current 
			 battery levels ([0] is maximum, [1] is current)
		"""

		if (self.device == None):
			raise NotConnected

		maximum_level = ctypes.c_uint8()
		current_level = ctypes.c_uint8()

		ret = self.mtp.LIBMTP_Get_Batterylevel(self.device, \
		  ctypes.byref(maximum_level), ctypes.byref(current_level))

		if (ret != 0):
			raise CommandFailed
			
		return (maximum_level.value, current_level.value)

	def get_modelname(self):
		"""
			Returns the connected device's model name (such 
			as "Zen V Plus")

			@rtype: string
			@return: The connected device's model name
		"""

		if (self.device == None):
			raise NotConnected

		return self.mtp.LIBMTP_Get_Modelname(self.device)

	def get_deviceversion(self):
		"""
			Returns the connected device's version (such as 
			firmware/hardware version)

			@rtype: string
			@return: Returns the connect device's version 
			 information
		"""

		if (self.device == None):
			raise NotConnected

		return self.mtp.LIBMTP_Get_Deviceversion(self.device)

	def get_filelisting(self, callback=None):
		"""
			Returns the connected device's file listing as a tuple, 
			containing L{LIBMTP_File} objects.

			@type callback: function or None
			@param callback: The function provided to libmtp to
			 receive callbacks from ptp. Callback must take two
			 arguments, total and sent (in bytes)
			@rtype: tuple
			@return: Returns the connect device file listing tuple
		"""

		if (self.device == None):
			raise NotConnected

		if (callback != None):
			callback = Progressfunc(callback)

		files = self.mtp.LIBMTP_Get_Filelisting_With_Callback(self.device, callback, None)
		ret = []
		next = files

		while next:
			ret.append(next.contents)
			if (next.contents.next == None):
				break
			next = next.contents.next

		return ret
	
	def get_filetype_description(self, filetype):
		"""
			Returns the description of the filetype

			@type filetype: int
			@param filetype: The MTP filetype integer
			@rtype: string
			@return: The file type information
		"""

		if (self.device == None):
			raise NotConnected

		return self.mtp.LIBMTP_Get_Filetype_Description(filetype)

	def get_file_metadata(self, file_id):
		"""
			Returns the file metadata from the connected device

			As per the libmtp documentation, calling this function 
			repeatly is not recommended, as it is slow and creates 
			a large amount of USB traffic.

			@type file_id: int
			@param file_id: The unique numeric file id
			@rtype: LIBMTP_File
			@return: The file metadata
		"""

		if (self.device == None):
			raise NotConnected

		ret = self.mtp.LIBMTP_Get_Filemetadata(self.device, file_id)

		if (not hasattr(ret, 'contents')):
			raise ObjectNotFound

		return ret.contents
	
	def get_tracklisting(self, callback=None):
		"""
			Returns tracks from the connected device

			@type callback: function or None
			@param callback: The function provided to libmtp to
			 receive callbacks from ptp. Callback must take two
			 arguments, total and sent (in bytes)
			@rtype: tuple
			@return: Returns a tuple full of L{LIBMTP_Track} objects
		"""

		if (self.device == None):
			raise NotConnected

		if (callback != None):
			callback = Progressfunc(callback)

		tracks = self.mtp.LIBMTP_Get_Tracklisting_With_Callback(self.device, callback, None)
		ret = []
		next = tracks

		while next:
			ret.append(next.contents)
			if (next.contents.next == None):
				break
			next = next.contents.next

		return ret

	def get_track_metadata(self, track_id):
		"""
			Returns the track metadata

                        As per the libmtp documentation, calling this function repeatly is not
			recommended, as it is slow and creates a large amount of USB traffic.

			@type track_id: int
			@param track_id: The unique numeric track id
			@rtype: L{LIBMTP_Track}
			@return: The track metadata
		"""

		if (self.device == None):
			raise NotConnected

		ret = self.mtp.LIBMTP_Get_Trackmetadata(self.device, track_id)

		if (not hasattr(ret, 'contents')):
			raise ObjectNotFound

		return ret.contents

	def get_file_to_file(self, file_id, target, callback=None):
		"""
			Downloads the file from the connected device and stores it at the 
			target location

			@type file_id: int
			@param file_id: The unique numeric file id
			@type target: str
			@param target: The location to place the file
			@type callback: function or None
			@param callback: The function provided to libmtp to 
			 receive callbacks from ptp. Callback must take two 
			 arguments, total and sent (in bytes)
		"""

		if (self.device == None):
			raise NotConnected
			
		if (callback != None):
			callback = Progressfunc(callback)
			
		ret = self.mtp.LIBMTP_Get_File_To_File(self.device, file_id, target, callback, None)

		if (ret != 0):
			self.debug_stack()
			raise CommandFailed

	def get_track_to_file(self, track_id, target, callback=None):
		"""
			Downloads the track from the connected device and stores it at 
			the target location
			
			@type track_id: int
			@param track_id: The unique numeric track id
			@type target: str
			@param target: The location to place the track
			@type callback: function or None
			@param callback: The function provided to libmtp to
			 receive callbacks from ptp. Callback must take two
			 arguments, total and sent (in bytes)
		"""

		if (self.device == None):
			raise NotConnected
			
		if (callback != None):
			callback = Progressfunc(callback)

		ret = self.mtp.LIBMTP_Get_Track_To_File(self.device, track_id, target, callback, None)

		if (ret != 0):
			self.debug_stack()
			raise CommandFailed

	def find_filetype(self, filename):
		"""
			Attempts to guess the filetype off the filename. Kind of 
			inaccurate and should be trusted with a grain of salt. It
			works in most situations, though.
			
			@type filename: str
			@param filename: The filename to attempt to guess from
			@rtype: int
			@return: The integer of the Filetype
		"""

		fileext = filename.lower().split(".")[-1]

		if (fileext == "wav" or fileext == "wave"):
			return LIBMTP_Filetype["WAV"]
		elif (fileext == "mp3"):
			return LIBMTP_Filetype["MP3"]
		elif (fileext == "wma"):
			return LIBMTP_Filetype["WMA"]
		elif (fileext == "ogg"):
			return LIBMTP_Filetype["OGG"]
		elif (fileext == "mp4"):
			return LIBMTP_Filetype["MP4"]
		elif (fileext == "wmv"):
			return LIBMTP_Filetype["WMV"]
		elif (fileext == "avi"):
			return LIBMTP_Filetype["AVI"]
		elif (fileext == "mpeg" or fileext == "mpg"):
			return LIBMTP_Filetype["MPEG"]
		elif (fileext == "asf"):
			return LIBMTP_Filetype["ASF"]
		elif (fileext == "qt" or fileext == "mov"):
			return LIBMTP_Filetype["QT"]
		elif (fileext == "jpeg" or fileext == "jpg"):
			return LIBMTP_Filetype["JPEG"]
		elif (fileext == "jfif"):
			return LIBMTP_Filetype["JFIF"]
		elif (fileext == "tif" or fileext == "tiff"):
			return LIBMTP_Filetype["TIFF"]
		elif (fileext == "bmp"):
			return LIBMTP_Filetype["BMP"]
		elif (fileext == "gif"):
			return LIBMTP_Filetype["GIF"]
		elif (fileext == "pic" or fileext == "pict"):
			return LIBMTP_Filetype["PICT"]
		elif (fileext == "png"):
			return LIBMTP_Filetype["PNG"]
		elif (fileext == "wmf"):
			return LIBMTP_Filetype["WINDOWSIMAGEFORMAT"]
		elif (fileext == "ics"):
			return LIBMTP_Filetype["VCALENDAR2"]
		elif (fileext == "exe" or fileext == "com" or fileext == "bat"\
		      or fileext == "dll" or fileext == "sys"):
			return LIBMTP_Filetype["WINEXEC"]
		elif (fileext == "aac"):
			return LIBMTP_Filetype["AAC"]
		elif (fileext == "mp2"):
			return LIBMTP_Filetype["MP2"]
		elif (fileext == "flac"):
			return LIBMTP_Filetype["FLAC"]
		elif (fileext == "m4a"):
			return LIBMTP_Filetype["M4A"]
		elif (fileext == "doc"):
			return LIBMTP_Filetype["DOC"]
		elif (fileext == "xml"):
			return LIBMTP_Filetype["XML"]
		elif (fileext == "xls"):
			return LIBMTP_Filetype["XLS"]
		elif (fileext == "ppt"):
			return LIBMTP_Filetype["PPT"]
		elif (fileext == "mht"):
			return LIBMTP_Filetype["MHT"]
		elif (fileext == "jp2"):
			return LIBMTP_Filetype["JP2"]
		elif (fileext == "jpx"):
			return LIBMTP_Filetype["JPX"]
		else:
			return LIBMTP_Filetype["UNKNOWN"]

	def send_file_from_file(self, source, target, callback=None):
		"""
			Sends a file from the filesystem to the connected device
			and stores it at the target filename inside the parent.
		
			This will attempt to "guess" the filetype with 
			find_filetype()
		
			@type source: str
			@param source: The path on the filesystem where the file resides
			@type target: str
			@param target: The target filename on the device
			@type callback: function or None
			@param callback: The function provided to libmtp to 
			 receive callbacks from ptp. Callback function must
			 take two arguments, sent and total (in bytes)
			@rtype: int
			@return: The object ID of the new file
		"""

		if (self.device == None):
			raise NotConnected

		if (os.path.isfile(source) == False):
			raise IOError
			
		if (callback != None):
			callback = Progressfunc(callback)

		metadata = LIBMTP_File(filename=target, \
		  filetype=self.find_filetype(source), \
		  filesize=os.stat(source).st_size)

		ret = self.mtp.LIBMTP_Send_File_From_File(self.device, source, \
		  ctypes.pointer(metadata), callback, None)

		if (ret != 0):
			self.debug_stack()
			raise CommandFailed

		return metadata.item_id
		
	def send_track_from_file(self, source, target, metadata, callback=None):
		"""
			Sends a track from the filesystem to the connected 
			device
			
			@type source: str
			@param source: The path where the track resides
			@type target: str
			@param target: The target filename on the device
			@type metadata: LIBMTP_Track
			@param metadata: The track metadata
			@type callback: function or None
			@param callback: The function provided to libmtp to
			 receive callbacks from ptp. Callback function must
			 take two arguments, sent and total (in bytes)
			@rtype: int
			@return: The object ID of the new track
		"""

		if (self.device == None):
			raise NotConnected

		if (os.path.exists(source) == None):
			raise IOError
		
		if callback:
			callback = Progressfunc(callback)
		
		metadata.filename = target
		metadata.filetype = self.find_filetype(source)
		metadata.filesize = os.stat(source).st_size

		ret = self.mtp.LIBMTP_Send_Track_From_File(self.device, source, \
		  ctypes.pointer(metadata), callback, None)

		if (ret != 0):
			self.debug_stack()
			raise CommandFailed

		return metadata.item_id
					
	def get_freespace(self):
		"""
			Returns the amount of free space on the connected device
			@rtype: long
			@return: The amount of free storage in bytes
		"""

		if (self.device == None):
			raise NotConnected

		self.mtp.LIBMTP_Get_Storage(self.device, 0)
		return self.device.contents.storage.contents.FreeSpaceInBytes

	def get_totalspace(self):
		"""
			Returns the total space on the connected device
			@rtype: long
			@return: The amount of total storage in bytes
		"""

		if (self.device == None):
			raise NotConnected

		self.mtp.LIBMTP_Get_Storage(self.device, 0)
		return self.device.contents.storage.contents.MaxCapacity
		
	def get_usedspace(self):
		"""
			Returns the amount of used space on the connected device

			@rtype: long
			@return: The amount of used storage in bytes
		"""

		if (self.device == None):
			raise NotConnected

		self.mtp.LIBMTP_Get_Storage(self.device, 0)
		storage = self.device.contents.storage.contents
		return (storage.MaxCapacity - storage.FreeSpaceInBytes)

	def get_usedspace_percent(self):
		"""
			Returns the amount of used space as a percentage

			@rtype: float
			@return: The percentage of used storage
		"""

		if (self.device == None):
			raise NotConnected

		self.mtp.LIBMTP_Get_Storage(self.device, 0)
		storage = self.device.contents.storage.contents

		# Why don't we call self.get_totalspace/self.get_usedspace 
		# here? That would require 3 *more* calls to 
		# LIBMTP_Get_Storage
		usedspace = storage.MaxCapacity - storage.FreeSpaceInBytes
		return ((float(usedspace) / float(storage.MaxCapacity)) * 100)

	def delete_object(self, object_id):
		"""
			Deletes the object off the connected device.

			@type object_id: int
			@param object_id: The unique object identifier
		"""

		if (self.device == None):
			raise NotConnected

		ret = self.mtp.LIBMTP_Delete_Object(self.device, object_id)

		if (ret != 0):
			self.debug_stack()
			raise CommandFailed

	def get_playlists(self):
		"""
			Returns a tuple filled with L{LIBMTP_Playlist} objects
			from the connected device.

			The main gotcha of this function is that the tracks 
			variable of LIBMTP_Playlist isn't iterable (without
			segfaults), so, you have to iterate over the no_tracks
			(through range or xrange) and access it that way (i.e.
			tracks[track_id]). Kind of sucks.

			@rtype: tuple
			@return: Tuple filled with LIBMTP_Playlist objects
		"""

		if (self.device == None):
			raise NotConnected

		playlists = self.mtp.LIBMTP_Get_Playlist_List(self.device)
		ret = []
		next = playlists

		while next:
			ret.append(next.contents)
			if (next.contents.next == None):
				break
			next = next.contents.next

		return ret

	def get_playlist(self, playlist_id):
		"""
			Returns a L{LIBMTP_Playlist} object of the requested
			playlist_id from the connected device

			@type playlist_id: int
			@param playlist_id: The unique playlist identifier
			@rtype: LIBMTP_Playlist
			@return: The playlist object
		"""

		if (self.device == None):
			raise NotConnected

		try:
			ret = self.mtp.LIBMTP_Get_Playlist(self.device, playlist_id).contents
		except ValueError:
			raise ObjectNotFound

		return ret

	def create_new_playlist(self, metadata):
		"""
			Creates a new playlist based on the metadata object
			passed.

			@type metadata: LIBMTP_Playlist
			@param metadata: A LIBMTP_Playlist object describing 
			 the playlist
			@rtype: int
			@return: The object ID of the new playlist
		"""

		if (self.device == None):
			raise NotConnected
		
		ret = self.mtp.LIBMTP_Create_New_Playlist(self.device, ctypes.pointer(metadata))

		if (ret != 0):
			self.debug_stack()
			raise CommandFailed

		return metadata.playlist_id

	def update_playlist(self, metadata):
		"""
			Updates a playlist based on the supplied metadata. 
			
			When updating the tracks field in a playlist, this
			function will replace the playlist's tracks with 
			the tracks supplied in the metadata object. This
			means that the previous tracks in the playlist
			will be overwritten.

			@type metadata: LIBMTP_Playlist
			@param metadata: A LIBMTP_Playlist object describing
			 the updates to the playlist.
		"""
		
		if (self.device == None):
			raise NotConnected

		ret = self.mtp.LIBMTP_Update_Playlist(self.device, ctypes.pointer(metadata))

		if (ret != 0):
			self.debug_stack()
			raise CommandFailed

	def get_folder_list(self):
		"""
			Returns a pythonic dict of the folders on the
			device.

			@rtype: dict
			@return: A dict of the folders on the device where
			 the folder ID is the key.
		"""
		
		if (self.device == None):
			raise NotConnected

		folders = self.mtp.LIBMTP_Get_Folder_List(self.device)
		next = folders
		# List of folders, key being the folder ID
		ret = {}		
		# Iterate over the folders to grab the first-level parents
		while True:
			next = next.contents
			scanned = True

			# Check if this ID exists, if not, add it
			# and trigger a scan of the children
			if not (ret.has_key(next.folder_id)):
				ret[next.folder_id] = next
				scanned = False

			if ((scanned == False) and (next.child)):
				## Scan the children
				next = next.child

			elif (next.sibling):
				## Scan the siblings
				next = next.sibling

			elif (next.parent_id != 0):
				## If we have no children/siblings to visit,
				## and we aren't at the parent, go back to
				## the parent.
			 	next = self.mtp.LIBMTP_Find_Folder(folders, int(next.parent_id))
		
			else:
				## We have scanned everything, let's go home.
				break
		
		return ret

	def get_parent_folders(self):
		"""
			Returns a list of only the parent folders.
			@rtype: list
			@return: Returns a list of the parent folders
		"""
				
		if (self.device == None):
			raise NotConnected
		folders = self.mtp.LIBMTP_Get_Folder_List(self.device)
		next = folders
		# A temporary holding space, this makes checking folder
		# IDs easier
		tmp = {}

		while True:
			next = next.contents
			## Check if this folder is in the dict
			if not (tmp.has_key(next.folder_id)):
				tmp[next.folder_id] = next

			# Check for siblings
			if (next.sibling):
				## Scan the sibling
				next = next.sibling
			else:
				## We're done here.
				break

		## convert the dict into a list
		ret = []
		for key in tmp:
			ret.append(tmp[key])

		return ret

	def create_folder(self, name, parent=0, storage=0):
		"""
			This creates a new folder in the parent. If the parent 
			is 0, it will go in the main directory.
			
			@type name: str
			@param name: The name for the folder
			@type parent: int
			@param parent: The parent ID or 0 for main directory
                        @type storage: int
                        @param storage: The storage id or 0 to create the new folder
                                        on the primary storage
			@rtype: int
			@return: Returns the object ID of the new folder
		"""

		if (self.device == None):
			raise NotConnected
			
		ret = self.mtp.LIBMTP_Create_Folder(self.device, name, parent, storage)

		if (ret == 0):
			self.debug_stack()
			raise CommandFailed 

		return ret

	def get_errorstack(self):
		"""
			Returns the connected device's errorstack from
			LIBMTP.
			@rtype: L{LIBMTP_Error}
			@return: An array of LIBMTP_Errors.
		"""

		if (self.device == None):
			raise NotConnected
		
		ret = self.mtp.LIBMTP_Get_Errorstack(self.device)

		if (ret != 0):
			raise CommandFailed

		return ret