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53b7f6294b
Allows Pillow to distinguish between JPEGs and MPOs, and provides some MPO metadata handling. Does not yet handle multiple frames.
71 lines
1.8 KiB
Python
71 lines
1.8 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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__version__ = "0.1"
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from PIL import Image, JpegImagePlugin
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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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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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JpegImagePlugin.JpegImageFile._open(self)
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self.__fp = self.fp # FIXME: hack
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self.__rewind = self.fp.tell()
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self.seek(0) # get ready to read first frame
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def seek(self, frame):
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if frame == 0:
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# rewind
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self.__offset = 0
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self.dispose = None
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self.__frame = -1
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self.__fp.seek(self.__rewind)
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if frame != self.__frame + 1:
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raise ValueError("cannot seek to frame %d" % frame)
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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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Image.register_open("MPO", MpoImageFile, _accept)
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Image.register_save("MPO", _save)
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Image.register_extension("MPO", ".mpo")
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Image.register_mime("MPO", "image/mpo")
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