Raphaël G. Git Repositories - youtubedl/blob - youtube_dl/postprocessor/common.py

   1 from __future__ import unicode_literals
   2
   3 from ..utils import PostProcessingError
   4
   5
   6 class PostProcessor(object):
   7     """Post Processor class.
   8
   9     PostProcessor objects can be added to downloaders with their
  10     add_post_processor() method. When the downloader has finished a
  11     successful download, it will take its internal chain of PostProcessors
  12     and start calling the run() method on each one of them, first with
  13     an initial argument and then with the returned value of the previous
  14     PostProcessor.
  15
  16     The chain will be stopped if one of them ever returns None or the end
  17     of the chain is reached.
  18
  19     PostProcessor objects follow a "mutual registration" process similar
  20     to InfoExtractor objects.
  21     """
  22
  23     _downloader = None
  24
  25     def __init__(self, downloader=None):
  26         self._downloader = downloader
  27
  28     def set_downloader(self, downloader):
  29         """Sets the downloader for this PP."""
  30         self._downloader = downloader
  31
  32     def run(self, information):
  33         """Run the PostProcessor.
  34
  35         The "information" argument is a dictionary like the ones
  36         composed by InfoExtractors. The only difference is that this
  37         one has an extra field called "filepath" that points to the
  38         downloaded file.
  39
  40         This method returns a tuple, the first element of which describes
  41         whether the original file should be kept (i.e. not deleted - None for
  42         no preference), and the second of which is the updated information.
  43
  44         In addition, this method may raise a PostProcessingError
  45         exception if post processing fails.
  46         """
  47         return None, information  # by default, keep file and do nothing
  48
  49
  50 class AudioConversionError(PostProcessingError):
  51     pass