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100 lines
3.0 KiB
Python
100 lines
3.0 KiB
Python
#
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# The Python Imaging Library.
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# $Id$
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#
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# MPO file handling
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#
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# See "Multi-Picture Format" (CIPA DC-007-Translation 2009, Standard of the
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# Camera & Imaging Products Association)
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#
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# The multi-picture object combines multiple JPEG images (with a modified EXIF
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# data format) into a single file. While it can theoretically be used much like
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# a GIF animation, it is commonly used to represent 3D photographs and is (as
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# of this writing) the most commonly used format by 3D cameras.
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#
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# History:
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# 2014-03-13 Feneric Created
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#
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# See the README file for information on usage and redistribution.
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#
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from PIL import Image, JpegImagePlugin
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__version__ = "0.1"
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def _accept(prefix):
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return JpegImagePlugin._accept(prefix)
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def _save(im, fp, filename):
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# Note that we can only save the current frame at present
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return JpegImagePlugin._save(im, fp, filename)
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##
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# Image plugin for MPO images.
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class MpoImageFile(JpegImagePlugin.JpegImageFile):
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format = "MPO"
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format_description = "MPO (CIPA DC-007)"
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def _open(self):
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self.fp.seek(0) # prep the fp in order to pass the JPEG test
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JpegImagePlugin.JpegImageFile._open(self)
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self.mpinfo = self._getmp()
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self.__framecount = self.mpinfo[0xB001]
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self.__mpoffsets = [mpent['DataOffset'] + self.info['mpoffset']
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for mpent in self.mpinfo[0xB002]]
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self.__mpoffsets[0] = 0
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# Note that the following assertion will only be invalid if something
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# gets broken within JpegImagePlugin.
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assert self.__framecount == len(self.__mpoffsets)
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del self.info['mpoffset'] # no longer needed
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self.__fp = self.fp # FIXME: hack
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self.__fp.seek(self.__mpoffsets[0]) # get ready to read first frame
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self.__frame = 0
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self.offset = 0
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# for now we can only handle reading and individual frame extraction
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self.readonly = 1
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def load_seek(self, pos):
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self.__fp.seek(pos)
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@property
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def n_frames(self):
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return self.__framecount
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@property
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def is_animated(self):
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return self.__framecount > 1
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def seek(self, frame):
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if frame < 0 or frame >= self.__framecount:
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raise EOFError("no more images in MPO file")
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else:
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self.fp = self.__fp
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self.offset = self.__mpoffsets[frame]
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self.tile = [
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("jpeg", (0, 0) + self.size, self.offset, (self.mode, ""))
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]
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self.__frame = frame
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def tell(self):
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return self.__frame
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# -------------------------------------------------------------------q-
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# Registry stuff
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# Note that since MPO shares a factory with JPEG, we do not need to do a
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# separate registration for it here.
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# Image.register_open(MpoImageFile.format,
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# JpegImagePlugin.jpeg_factory, _accept)
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Image.register_save(MpoImageFile.format, _save)
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Image.register_extension(MpoImageFile.format, ".mpo")
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Image.register_mime(MpoImageFile.format, "image/mpo")
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