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203 lines
6.6 KiB
Python
203 lines
6.6 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 __future__ import annotations
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import os
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import struct
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from typing import IO, Any, cast
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from . import (
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Image,
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ImageFile,
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ImageSequence,
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JpegImagePlugin,
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TiffImagePlugin,
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)
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from ._binary import o32le
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from ._util import DeferredError
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def _save(im: Image.Image, fp: IO[bytes], filename: str | bytes) -> None:
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JpegImagePlugin._save(im, fp, filename)
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def _save_all(im: Image.Image, fp: IO[bytes], filename: str | bytes) -> None:
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append_images = im.encoderinfo.get("append_images", [])
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if not append_images and not getattr(im, "is_animated", False):
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_save(im, fp, filename)
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return
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mpf_offset = 28
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offsets: list[int] = []
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im_sequences = [im, *append_images]
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total = sum(getattr(seq, "n_frames", 1) for seq in im_sequences)
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for im_sequence in im_sequences:
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for im_frame in ImageSequence.Iterator(im_sequence):
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if not offsets:
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# APP2 marker
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ifd_length = 66 + 16 * total
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im_frame.encoderinfo["extra"] = (
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b"\xff\xe2"
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+ struct.pack(">H", 6 + ifd_length)
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+ b"MPF\0"
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+ b" " * ifd_length
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)
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exif = im_frame.encoderinfo.get("exif")
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if isinstance(exif, Image.Exif):
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exif = exif.tobytes()
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im_frame.encoderinfo["exif"] = exif
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if exif:
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mpf_offset += 4 + len(exif)
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JpegImagePlugin._save(im_frame, fp, filename)
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offsets.append(fp.tell())
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else:
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encoderinfo = im_frame._attach_default_encoderinfo(im)
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im_frame.save(fp, "JPEG")
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im_frame.encoderinfo = encoderinfo
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offsets.append(fp.tell() - offsets[-1])
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ifd = TiffImagePlugin.ImageFileDirectory_v2()
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ifd[0xB000] = b"0100"
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ifd[0xB001] = len(offsets)
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mpentries = b""
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data_offset = 0
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for i, size in enumerate(offsets):
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if i == 0:
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mptype = 0x030000 # Baseline MP Primary Image
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else:
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mptype = 0x000000 # Undefined
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mpentries += struct.pack("<LLLHH", mptype, size, data_offset, 0, 0)
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if i == 0:
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data_offset -= mpf_offset
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data_offset += size
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ifd[0xB002] = mpentries
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fp.seek(mpf_offset)
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fp.write(b"II\x2a\x00" + o32le(8) + ifd.tobytes(8))
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fp.seek(0, os.SEEK_END)
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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) -> None:
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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: dict[int, Any] | None = None) -> None:
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self.mpinfo = mpheader if mpheader is not None else self._getmp()
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if self.mpinfo is None:
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msg = "Image appears to be a malformed MPO file"
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raise ValueError(msg)
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self.n_frames = 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.n_frames == len(self.__mpoffsets)
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del self.info["mpoffset"] # no longer needed
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self.is_animated = self.n_frames > 1
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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: int) -> None:
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if isinstance(self._fp, DeferredError):
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raise self._fp.ex
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self._fp.seek(pos)
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def seek(self, frame: int) -> None:
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if not self._seek_check(frame):
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return
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if isinstance(self._fp, DeferredError):
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raise self._fp.ex
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self.fp = self._fp
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self.offset = self.__mpoffsets[frame]
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original_exif = self.info.get("exif")
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if "exif" in self.info:
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del self.info["exif"]
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self.fp.seek(self.offset + 2) # skip SOI marker
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if not self.fp.read(2):
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msg = "No data found for frame"
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raise ValueError(msg)
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self.fp.seek(self.offset)
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JpegImagePlugin.JpegImageFile._open(self)
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if self.info.get("exif") != original_exif:
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self._reload_exif()
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self.tile = [
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ImageFile._Tile("jpeg", (0, 0) + self.size, self.offset, self.tile[0][-1])
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]
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self.__frame = frame
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def tell(self) -> int:
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return self.__frame
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@staticmethod
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def adopt(
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jpeg_instance: JpegImagePlugin.JpegImageFile,
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mpheader: dict[int, Any] | None = None,
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) -> MpoImageFile:
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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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mpo_instance = cast(MpoImageFile, jpeg_instance)
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mpo_instance._after_jpeg_open(mpheader)
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return mpo_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_save_all(MpoImageFile.format, _save_all)
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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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