337 lines
12 KiB
Python
337 lines
12 KiB
Python
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# -*- coding: utf-8 -*-
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# imageio is distributed under the terms of the (new) BSD License.
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""" Read/Write SWF files.
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Backend: internal
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Shockwave flash (SWF) is a media format designed for rich and
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interactive animations. This plugin makes use of this format to
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store a series of images in a lossless format with good compression
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(zlib). The resulting images can be shown as an animation using
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a flash player (such as the browser).
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SWF stores images in RGBA format. RGB or grayscale images are
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automatically converted. SWF does not support meta data.
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Parameters for reading
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----------------------
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loop : bool
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If True, the video will rewind as soon as a frame is requested
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beyond the last frame. Otherwise, IndexError is raised. Default False.
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Parameters for saving
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---------------------
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fps : int
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The speed to play the animation. Default 12.
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loop : bool
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If True, add a tag to the end of the file to play again from
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the first frame. Most flash players will then play the movie
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in a loop. Note that the imageio SWF Reader does not check this
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tag. Default True.
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html : bool
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If the output is a file on the file system, write an html file
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(in HTML5) that shows the animation. Default False.
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compress : bool
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Whether to compress the swf file. Default False. You probably don't
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want to use this. This does not decrease the file size since
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the images are already compressed. It will result in slower
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read and write time. The only purpose of this feature is to
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create compressed SWF files, so that we can test the
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functionality to read them.
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"""
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import os
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import zlib
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import logging
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from io import BytesIO
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import numpy as np
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from ..core import Format, read_n_bytes, image_as_uint
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logger = logging.getLogger(__name__)
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_swf = None # lazily loaded in lib()
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def load_lib():
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global _swf
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from . import _swf
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return _swf
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class SWFFormat(Format):
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"""See :mod:`imageio.plugins.swf`"""
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def _can_read(self, request):
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tmp = request.firstbytes[0:3].decode("ascii", "ignore")
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if tmp in ("FWS", "CWS"):
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return True
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def _can_write(self, request):
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if request.extension in self.extensions:
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return True
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# -- reader
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class Reader(Format.Reader):
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def _open(self, loop=False):
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if not _swf:
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load_lib()
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self._arg_loop = bool(loop)
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self._fp = self.request.get_file()
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# Check file ...
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tmp = self.request.firstbytes[0:3].decode("ascii", "ignore")
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if tmp == "FWS":
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pass # OK
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elif tmp == "CWS":
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# Compressed, we need to decompress
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bb = self._fp.read()
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bb = bb[:8] + zlib.decompress(bb[8:])
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# Wrap up in a file object
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self._fp = BytesIO(bb)
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else:
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raise IOError("This does not look like a valid SWF file")
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# Skip first bytes. This also tests support got seeking ...
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try:
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self._fp.seek(8)
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self._streaming_mode = False
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except Exception:
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self._streaming_mode = True
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self._fp_read(8)
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# Skip header
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# Note that the number of frames is there, which we could
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# potentially use, but the number of frames does not necessarily
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# correspond to the number of images.
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nbits = _swf.bits2int(self._fp_read(1), 5)
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nbits = 5 + nbits * 4
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Lrect = nbits / 8.0
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if Lrect % 1:
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Lrect += 1
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Lrect = int(Lrect)
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self._fp_read(Lrect + 3)
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# Now the rest is basically tags ...
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self._imlocs = [] # tuple (loc, sze, T, L1)
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if not self._streaming_mode:
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# Collect locations of frame, while skipping through the data
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# This does not read any of the tag *data*.
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try:
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while True:
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isimage, sze, T, L1 = self._read_one_tag()
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loc = self._fp.tell()
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if isimage:
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# Still need to check if the format is right
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format = ord(self._fp_read(3)[2:])
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if format == 5: # RGB or RGBA lossless
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self._imlocs.append((loc, sze, T, L1))
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self._fp.seek(loc + sze) # Skip over tag
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except IndexError:
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pass # done reading
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def _fp_read(self, n):
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return read_n_bytes(self._fp, n)
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def _close(self):
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pass
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def _get_length(self):
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if self._streaming_mode:
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return np.inf
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else:
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return len(self._imlocs)
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def _get_data(self, index):
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# Check index
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if index < 0:
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raise IndexError("Index in swf file must be > 0")
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if not self._streaming_mode:
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if self._arg_loop and self._imlocs:
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index = index % len(self._imlocs)
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if index >= len(self._imlocs):
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raise IndexError("Index out of bounds")
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if self._streaming_mode:
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# Walk over tags until we find an image
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while True:
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isimage, sze, T, L1 = self._read_one_tag()
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bb = self._fp_read(sze) # always read data
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if isimage:
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im = _swf.read_pixels(bb, 0, T, L1) # can be None
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if im is not None:
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return im, {}
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else:
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# Go to corresponding location, read data, and convert to image
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loc, sze, T, L1 = self._imlocs[index]
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self._fp.seek(loc)
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bb = self._fp_read(sze)
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# Read_pixels should return ndarry, since we checked format
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im = _swf.read_pixels(bb, 0, T, L1)
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return im, {}
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def _read_one_tag(self):
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"""
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Return (True, loc, size, T, L1) if an image that we can read.
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Return (False, loc, size, T, L1) if any other tag.
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"""
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# Get head
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head = self._fp_read(6)
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if not head: # pragma: no cover
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raise IndexError("Reached end of swf movie")
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# Determine type and length
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T, L1, L2 = _swf.get_type_and_len(head)
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if not L2: # pragma: no cover
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raise RuntimeError("Invalid tag length, could not proceed")
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# Read data
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isimage = False
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sze = L2 - 6
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# bb = self._fp_read(L2 - 6)
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# Parse tag
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if T == 0:
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raise IndexError("Reached end of swf movie")
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elif T in [20, 36]:
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isimage = True
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# im = _swf.read_pixels(bb, 0, T, L1) # can be None
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elif T in [6, 21, 35, 90]: # pragma: no cover
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logger.warning("Ignoring JPEG image: cannot read JPEG.")
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else:
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pass # Not an image tag
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# Done. Return image. Can be None
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# return im
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return isimage, sze, T, L1
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def _get_meta_data(self, index):
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return {} # This format does not support meta data
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# -- writer
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class Writer(Format.Writer):
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def _open(self, fps=12, loop=True, html=False, compress=False):
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if not _swf:
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load_lib()
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self._arg_fps = int(fps)
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self._arg_loop = bool(loop)
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self._arg_html = bool(html)
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self._arg_compress = bool(compress)
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self._fp = self.request.get_file()
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self._framecounter = 0
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self._framesize = (100, 100)
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# For compress, we use an in-memory file object
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if self._arg_compress:
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self._fp_real = self._fp
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self._fp = BytesIO()
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def _close(self):
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self._complete()
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# Get size of (uncompressed) file
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sze = self._fp.tell()
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# set nframes, this is in the potentially compressed region
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self._fp.seek(self._location_to_save_nframes)
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self._fp.write(_swf.int2uint16(self._framecounter))
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# Compress body?
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if self._arg_compress:
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bb = self._fp.getvalue()
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self._fp = self._fp_real
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self._fp.write(bb[:8])
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self._fp.write(zlib.compress(bb[8:]))
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sze = self._fp.tell() # renew sze value
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# set size
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self._fp.seek(4)
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self._fp.write(_swf.int2uint32(sze))
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self._fp = None # Disable
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# Write html?
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if self._arg_html and os.path.isfile(self.request.filename):
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dirname, fname = os.path.split(self.request.filename)
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filename = os.path.join(dirname, fname[:-4] + ".html")
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w, h = self._framesize
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html = HTML % (fname, w, h, fname)
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with open(filename, "wb") as f:
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f.write(html.encode("utf-8"))
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def _write_header(self, framesize, fps):
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self._framesize = framesize
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# Called as soon as we know framesize; when we get first frame
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bb = b""
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bb += "FC"[self._arg_compress].encode("ascii")
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bb += "WS".encode("ascii") # signature bytes
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bb += _swf.int2uint8(8) # version
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bb += "0000".encode("ascii") # FileLength (leave open for now)
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bb += (
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_swf.Tag().make_rect_record(0, framesize[0], 0, framesize[1]).tobytes()
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)
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bb += _swf.int2uint8(0) + _swf.int2uint8(fps) # FrameRate
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self._location_to_save_nframes = len(bb)
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bb += "00".encode("ascii") # nframes (leave open for now)
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self._fp.write(bb)
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# Write some initial tags
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taglist = _swf.FileAttributesTag(), _swf.SetBackgroundTag(0, 0, 0)
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for tag in taglist:
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self._fp.write(tag.get_tag())
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def _complete(self):
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# What if no images were saved?
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if not self._framecounter:
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self._write_header((10, 10), self._arg_fps)
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# Write stop tag if we do not loop
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if not self._arg_loop:
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self._fp.write(_swf.DoActionTag("stop").get_tag())
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# finish with end tag
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self._fp.write("\x00\x00".encode("ascii"))
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def _append_data(self, im, meta):
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# Correct shape and type
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if im.ndim == 3 and im.shape[-1] == 1:
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im = im[:, :, 0]
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im = image_as_uint(im, bitdepth=8)
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# Get frame size
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wh = im.shape[1], im.shape[0]
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# Write header on first frame
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isfirstframe = False
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if self._framecounter == 0:
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isfirstframe = True
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self._write_header(wh, self._arg_fps)
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# Create tags
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bm = _swf.BitmapTag(im)
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sh = _swf.ShapeTag(bm.id, (0, 0), wh)
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po = _swf.PlaceObjectTag(1, sh.id, move=(not isfirstframe))
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sf = _swf.ShowFrameTag()
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# Write tags
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for tag in [bm, sh, po, sf]:
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self._fp.write(tag.get_tag())
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self._framecounter += 1
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def set_meta_data(self, meta):
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pass
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HTML = """
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<!DOCTYPE html>
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<html>
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<head>
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<title>Show Flash animation %s</title>
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</head>
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<body>
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<embed width="%i" height="%i" src="%s">
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</html>
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"""
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