forked from s444420/AL-2020
142 lines
4.3 KiB
Python
142 lines
4.3 KiB
Python
#
|
|
# The Python Imaging Library.
|
|
# $Id$
|
|
#
|
|
# MPO file handling
|
|
#
|
|
# See "Multi-Picture Format" (CIPA DC-007-Translation 2009, Standard of the
|
|
# Camera & Imaging Products Association)
|
|
#
|
|
# The multi-picture object combines multiple JPEG images (with a modified EXIF
|
|
# data format) into a single file. While it can theoretically be used much like
|
|
# a GIF animation, it is commonly used to represent 3D photographs and is (as
|
|
# of this writing) the most commonly used format by 3D cameras.
|
|
#
|
|
# History:
|
|
# 2014-03-13 Feneric Created
|
|
#
|
|
# See the README file for information on usage and redistribution.
|
|
#
|
|
|
|
from . import Image, ImageFile, JpegImagePlugin
|
|
from ._binary import i16be as i16
|
|
|
|
|
|
def _accept(prefix):
|
|
return JpegImagePlugin._accept(prefix)
|
|
|
|
|
|
def _save(im, fp, filename):
|
|
# Note that we can only save the current frame at present
|
|
return JpegImagePlugin._save(im, fp, filename)
|
|
|
|
|
|
##
|
|
# Image plugin for MPO images.
|
|
|
|
|
|
class MpoImageFile(JpegImagePlugin.JpegImageFile):
|
|
|
|
format = "MPO"
|
|
format_description = "MPO (CIPA DC-007)"
|
|
_close_exclusive_fp_after_loading = False
|
|
|
|
def _open(self):
|
|
self.fp.seek(0) # prep the fp in order to pass the JPEG test
|
|
JpegImagePlugin.JpegImageFile._open(self)
|
|
self._after_jpeg_open()
|
|
|
|
def _after_jpeg_open(self, mpheader=None):
|
|
self.mpinfo = mpheader if mpheader is not None else self._getmp()
|
|
self.__framecount = self.mpinfo[0xB001]
|
|
self.__mpoffsets = [
|
|
mpent["DataOffset"] + self.info["mpoffset"] for mpent in self.mpinfo[0xB002]
|
|
]
|
|
self.__mpoffsets[0] = 0
|
|
# Note that the following assertion will only be invalid if something
|
|
# gets broken within JpegImagePlugin.
|
|
assert self.__framecount == len(self.__mpoffsets)
|
|
del self.info["mpoffset"] # no longer needed
|
|
self.__fp = self.fp # FIXME: hack
|
|
self.__fp.seek(self.__mpoffsets[0]) # get ready to read first frame
|
|
self.__frame = 0
|
|
self.offset = 0
|
|
# for now we can only handle reading and individual frame extraction
|
|
self.readonly = 1
|
|
|
|
def load_seek(self, pos):
|
|
self.__fp.seek(pos)
|
|
|
|
@property
|
|
def n_frames(self):
|
|
return self.__framecount
|
|
|
|
@property
|
|
def is_animated(self):
|
|
return self.__framecount > 1
|
|
|
|
def seek(self, frame):
|
|
if not self._seek_check(frame):
|
|
return
|
|
self.fp = self.__fp
|
|
self.offset = self.__mpoffsets[frame]
|
|
|
|
self.fp.seek(self.offset + 2) # skip SOI marker
|
|
segment = self.fp.read(2)
|
|
if not segment:
|
|
raise ValueError("No data found for frame")
|
|
if i16(segment) == 0xFFE1: # APP1
|
|
n = i16(self.fp.read(2)) - 2
|
|
self.info["exif"] = ImageFile._safe_read(self.fp, n)
|
|
|
|
exif = self.getexif()
|
|
if 40962 in exif and 40963 in exif:
|
|
self._size = (exif[40962], exif[40963])
|
|
elif "exif" in self.info:
|
|
del self.info["exif"]
|
|
|
|
self.tile = [("jpeg", (0, 0) + self.size, self.offset, (self.mode, ""))]
|
|
self.__frame = frame
|
|
|
|
def tell(self):
|
|
return self.__frame
|
|
|
|
def _close__fp(self):
|
|
try:
|
|
if self.__fp != self.fp:
|
|
self.__fp.close()
|
|
except AttributeError:
|
|
pass
|
|
finally:
|
|
self.__fp = None
|
|
|
|
@staticmethod
|
|
def adopt(jpeg_instance, mpheader=None):
|
|
"""
|
|
Transform the instance of JpegImageFile into
|
|
an instance of MpoImageFile.
|
|
After the call, the JpegImageFile is extended
|
|
to be an MpoImageFile.
|
|
|
|
This is essentially useful when opening a JPEG
|
|
file that reveals itself as an MPO, to avoid
|
|
double call to _open.
|
|
"""
|
|
jpeg_instance.__class__ = MpoImageFile
|
|
jpeg_instance._after_jpeg_open(mpheader)
|
|
return jpeg_instance
|
|
|
|
|
|
# ---------------------------------------------------------------------
|
|
# Registry stuff
|
|
|
|
# Note that since MPO shares a factory with JPEG, we do not need to do a
|
|
# separate registration for it here.
|
|
# Image.register_open(MpoImageFile.format,
|
|
# JpegImagePlugin.jpeg_factory, _accept)
|
|
Image.register_save(MpoImageFile.format, _save)
|
|
|
|
Image.register_extension(MpoImageFile.format, ".mpo")
|
|
|
|
Image.register_mime(MpoImageFile.format, "image/mpo")
|