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     cli_configuration_args,
   8     encodeFilename,
   9 )
  10
  11
  12 class PostProcessor(object):
  13     """Post Processor class.
  14
  15     PostProcessor objects can be added to downloaders with their
  16     add_post_processor() method. When the downloader has finished a
  17     successful download, it will take its internal chain of PostProcessors
  18     and start calling the run() method on each one of them, first with
  19     an initial argument and then with the returned value of the previous
  20     PostProcessor.
  21
  22     The chain will be stopped if one of them ever returns None or the end
  23     of the chain is reached.
  24
  25     PostProcessor objects follow a "mutual registration" process similar
  26     to InfoExtractor objects.
  27
  28     Optionally PostProcessor can use a list of additional command-line arguments
  29     with self._configuration_args.
  30     """
  31
  32     _downloader = None
  33
  34     def __init__(self, downloader=None):
  35         self._downloader = downloader
  36
  37     def set_downloader(self, downloader):
  38         """Sets the downloader for this PP."""
  39         self._downloader = downloader
  40
  41     def run(self, information):
  42         """Run the PostProcessor.
  43
  44         The "information" argument is a dictionary like the ones
  45         composed by InfoExtractors. The only difference is that this
  46         one has an extra field called "filepath" that points to the
  47         downloaded file.
  48
  49         This method returns a tuple, the first element is a list of the files
  50         that can be deleted, and the second of which is the updated
  51         information.
  52
  53         In addition, this method may raise a PostProcessingError
  54         exception if post processing fails.
  55         """
  56         return [], information  # by default, keep file and do nothing
  57
  58     def try_utime(self, path, atime, mtime, errnote='Cannot update utime of file'):
  59         try:
  60             os.utime(encodeFilename(path), (atime, mtime))
  61         except Exception:
  62             self._downloader.report_warning(errnote)
  63
  64     def _configuration_args(self, default=[]):
  65         return cli_configuration_args(self._downloader.params, 'postprocessor_args', default)
  66
  67
  68 class AudioConversionError(PostProcessingError):
  69     pass