added qtknife, movie modification tool

qtknife.py

@@ -0,0 +1,83 @@
+#!/usr/bin/env python
+
+
+import sys
+import logging
+import optparse
+import os
+
+import qtfile
+import qtatoms
+
+
+USAGE = """Usage: %prog [options] <input_movie> <output_movie>
+
+Modify atoms and fields in a QuickTime movie. Multiple atoms and fields
+can be specified separated by commas. Field modifications should be specified
+in the format key:converter:value, for example:
+
+	$ qtknife.py -M colr -F matrix:int:2 input.mov output.mov
+"""
+
+
+
+def main(argv):
+	parser = optparse.OptionParser(usage=USAGE)
+	parser.add_option("-D", "--debug", action="store_true", help="Enable debugging output")
+	parser.add_option("-M", "--modify-types", default=None, help="Modify specific atom types")
+	parser.add_option("-F", "--fields", default=None, help="Modify atom field values")
+	parser.add_option("-S", "--strip-types", default=None, help="Strip specific atom types")
+
+	opts, args = parser.parse_args(argv)
+	if opts.modify_types:
+		modify_types = opts.modify_types.split(",")
+	else:
+		modify_types = []
+
+	if opts.fields:
+		fields = opts.fields.split(",")
+	else:
+		fields = []
+
+	if opts.strip_types:
+		strip_types = opts.strip_types.split(",")
+	else:
+		strip_types = []
+
+	converters = {"str": str,
+				  "int": int}
+
+	if len(args) == 3:
+		source, dest = args[1:]
+	else:
+		parser.error("missing mandatory arguments (need source and destination path)")
+
+	if opts.debug:
+		logging.basicConfig(format="%(asctime)s | %(message)s", level=logging.DEBUG)
+	else:
+		logging.basicConfig(format="%(asctime)s | %(message)s", level=logging.INFO)
+
+	qt = qtfile.QuickTimeFile(source, atom_modules=[qtatoms])
+	target = open(dest, 'wb', 0)
+
+	for kind in strip_types:
+		for atom in qt.find(kind):
+			print "%s -> [free]" % (atom)
+			atom.free()
+
+	for kind in modify_types:
+		for atom in qt.find(kind):
+			print atom
+			for key, converter, value in [f.split(":") for f in fields]:
+				if atom.has_key(key):
+					previous_value = atom[key]
+					atom[key] = converters.get(converter, str)(value)
+					print "| %s=%s -> %s" % (key, previous_value, value)
+				else:
+					print "| %s (no such field)" % (key)
+
+	qt.write(target)
+	return 0
+
+if __name__ == "__main__":
+	sys.exit(main(sys.argv))