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142 lines
4.3 KiB
Python
142 lines
4.3 KiB
Python
5 years ago
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#
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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 . import Image, ImageFile, JpegImagePlugin
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from ._binary import i16be as i16
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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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_close_exclusive_fp_after_loading = False
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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._after_jpeg_open()
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def _after_jpeg_open(self, mpheader=None):
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self.mpinfo = mpheader if mpheader is not None else self._getmp()
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self.__framecount = self.mpinfo[0xB001]
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self.__mpoffsets = [
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mpent["DataOffset"] + self.info["mpoffset"] for mpent in self.mpinfo[0xB002]
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]
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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 not self._seek_check(frame):
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return
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self.fp = self.__fp
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self.offset = self.__mpoffsets[frame]
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self.fp.seek(self.offset + 2) # skip SOI marker
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segment = self.fp.read(2)
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if not segment:
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raise ValueError("No data found for frame")
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if i16(segment) == 0xFFE1: # APP1
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n = i16(self.fp.read(2)) - 2
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self.info["exif"] = ImageFile._safe_read(self.fp, n)
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exif = self.getexif()
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if 40962 in exif and 40963 in exif:
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self._size = (exif[40962], exif[40963])
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elif "exif" in self.info:
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del self.info["exif"]
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self.tile = [("jpeg", (0, 0) + self.size, self.offset, (self.mode, ""))]
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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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def _close__fp(self):
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try:
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if self.__fp != self.fp:
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self.__fp.close()
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except AttributeError:
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pass
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finally:
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self.__fp = None
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@staticmethod
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def adopt(jpeg_instance, mpheader=None):
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"""
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Transform the instance of JpegImageFile into
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an instance of MpoImageFile.
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After the call, the JpegImageFile is extended
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to be an MpoImageFile.
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This is essentially useful when opening a JPEG
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file that reveals itself as an MPO, to avoid
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double call to _open.
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"""
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jpeg_instance.__class__ = MpoImageFile
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jpeg_instance._after_jpeg_open(mpheader)
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return jpeg_instance
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# ---------------------------------------------------------------------
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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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