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

   1 from __future__ import unicode_literals
   2
   3 import os
   4
   5 from ..utils import (
   6     PostProcessingError,
   7     encodeFilename,
   8 )
   9
  10
  11 class PostProcessor(object):
  12     """Post Processor class.
  13
  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
  19     PostProcessor.
  20
  21     The chain will be stopped if one of them ever returns None or the end
  22     of the chain is reached.
  23
  24     PostProcessor objects follow a "mutual registration" process similar
  25     to InfoExtractor objects.
  26
  27     Optionally PostProcessor can use a list of additional command-line arguments
  28     with self._configuration_args.
  29     """
  30
  31     _downloader = None
  32
  33     def __init__(self, downloader=None):
  34         self._downloader = downloader
  35
  36     def set_downloader(self, downloader):
  37         """Sets the downloader for this PP."""
  38         self._downloader = downloader
  39
  40     def run(self, information):
  41         """Run the PostProcessor.
  42
  43         The "information" argument is a dictionary like the ones
  44         composed by InfoExtractors. The only difference is that this
  45         one has an extra field called "filepath" that points to the
  46         downloaded file.
  47
  48         This method returns a tuple, the first element is a list of the files
  49         that can be deleted, and the second of which is the updated
  50         information.
  51
  52         In addition, this method may raise a PostProcessingError
  53         exception if post processing fails.
  54         """
  55         return [], information  # by default, keep file and do nothing
  56
  57     def try_utime(self, path, atime, mtime, errnote='Cannot update utime of file'):
  58         try:
  59             os.utime(encodeFilename(path), (atime, mtime))
  60         except Exception:
  61             self._downloader.report_warning(errnote)
  62
  63     def _configuration_args(self, default=[]):
  64         pp_args = self._downloader.params.get('postprocessor_args')
  65         if pp_args is None:
  66             return default
  67         assert isinstance(pp_args, list)
  68         return pp_args
  69
  70
  71 class AudioConversionError(PostProcessingError):
  72     pass