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

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