1 from __future__ import unicode_literals
11 class PostProcessor(object):
12 """Post Processor class.
14 PostProcessor objects can be added to downloaders with their
15 add_post_processor() method. When the downloader has finished a
16 successful download, it will take its internal chain of PostProcessors
17 and start calling the run() method on each one of them, first with
18 an initial argument and then with the returned value of the previous
21 The chain will be stopped if one of them ever returns None or the end
22 of the chain is reached.
24 PostProcessor objects follow a "mutual registration" process similar
25 to InfoExtractor objects.
30 def __init__(self, downloader=None):
31 self._downloader = downloader
33 def set_downloader(self, downloader):
34 """Sets the downloader for this PP."""
35 self._downloader = downloader
37 def run(self, information):
38 """Run the PostProcessor.
40 The "information" argument is a dictionary like the ones
41 composed by InfoExtractors. The only difference is that this
42 one has an extra field called "filepath" that points to the
45 This method returns a tuple, the first element of which describes
46 whether the original file should be kept (i.e. not deleted - None for
47 no preference), and the second of which is the updated information.
49 In addition, this method may raise a PostProcessingError
50 exception if post processing fails.
52 return None, information # by default, keep file and do nothing
54 def try_utime(self, path, atime, mtime, errnote='Cannot update utime of file'):
56 os.utime(encodeFilename(path), (atime, mtime))
58 self._downloader.report_warning(errnote)
61 class AudioConversionError(PostProcessingError):