Introduction
============

Hsalf, or reversed Flash, is a pure Python package to read and write Flash
file formats.

Hsalf supports SWF file, both compressed and uncompressed formats.


License
=======

Hsalf is released under the MIT license.


Example
=======

This example prints out file version, frame rate, and all tag codes::

	from hsalf import swf
	f = swf.SwfFile('screen.swf')
	print f.header.file_header.version
	print f.header.frame_header.frame_rate

	for tag in f.iter_body():
		print tag.tag_code

This function extracts frames from a Screen Video from a Flash movie::

	def extract_screen_video(file_name, stream_id, dst_dir='.'):
		import os
		import Image

		swf = SwfFile(file_name)
		last_img = None
		for tag in swf.iter_body():
		 	if isinstance(tag, VideoFrameTag) and tag.stream_id == stream_id:
				svp = ScreenVideoPacket().deserialize(
					StringIO(tag.video_data))
				if svp.frame_type == KEY_FRAME:
					last_img = Image.new('RGB',
						(svp.image_width, svp.image_height))
				img = svp.to_image(last_img)
				img.save('{0}{1}{2:05d}.png'.format(dst_dir, os.sep,
					tag.frame_num))
				last_img = img

There are some sample scripts to extract other materials from SWF file in
``scripts`` directory.