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102 lines
3.4 KiB
Python
102 lines
3.4 KiB
Python
from __future__ import unicode_literals
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import os
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from ..compat import compat_str
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from ..utils import (
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cli_configuration_args,
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encodeFilename,
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PostProcessingError,
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)
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class PostProcessor(object):
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"""Post Processor class.
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PostProcessor objects can be added to downloaders with their
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add_post_processor() method. When the downloader has finished a
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successful download, it will take its internal chain of PostProcessors
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and start calling the run() method on each one of them, first with
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an initial argument and then with the returned value of the previous
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PostProcessor.
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The chain will be stopped if one of them ever returns None or the end
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of the chain is reached.
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PostProcessor objects follow a "mutual registration" process similar
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to InfoExtractor objects.
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Optionally PostProcessor can use a list of additional command-line arguments
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with self._configuration_args.
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"""
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_downloader = None
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def __init__(self, downloader=None):
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self._downloader = downloader
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self.PP_NAME = self.pp_key()
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@classmethod
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def pp_key(cls):
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name = cls.__name__[:-2]
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return compat_str(name[6:]) if name[:6].lower() == 'ffmpeg' else name
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def to_screen(self, text, prefix=True, *args, **kwargs):
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tag = '[%s] ' % self.PP_NAME if prefix else ''
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if self._downloader:
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return self._downloader.to_screen('%s%s' % (tag, text), *args, **kwargs)
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def report_warning(self, text, *args, **kwargs):
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if self._downloader:
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return self._downloader.report_warning(text, *args, **kwargs)
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def report_error(self, text, *args, **kwargs):
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if self._downloader:
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return self._downloader.report_error(text, *args, **kwargs)
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def write_debug(self, text, prefix=True, *args, **kwargs):
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tag = '[debug] ' if prefix else ''
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if self.get_param('verbose', False) and self._downloader:
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return self._downloader.to_screen('%s%s' % (tag, text), *args, **kwargs)
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def get_param(self, name, default=None, *args, **kwargs):
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if self._downloader:
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return self._downloader.params.get(name, default, *args, **kwargs)
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return default
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def set_downloader(self, downloader):
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"""Sets the downloader for this PP."""
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self._downloader = downloader
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def run(self, information):
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"""Run the PostProcessor.
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The "information" argument is a dictionary like the ones
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composed by InfoExtractors. The only difference is that this
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one has an extra field called "filepath" that points to the
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downloaded file.
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This method returns a tuple, the first element is a list of the files
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that can be deleted, and the second of which is the updated
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information.
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In addition, this method may raise a PostProcessingError
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exception if post processing fails.
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"""
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return [], information # by default, keep file and do nothing
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def try_utime(self, path, atime, mtime, errnote='Cannot update utime of file'):
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try:
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os.utime(encodeFilename(path), (atime, mtime))
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except Exception:
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self.report_warning(errnote)
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def _configuration_args(self, *args, **kwargs):
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return cli_configuration_args(
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self._downloader.params.get('postprocessor_args'),
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self.pp_key().lower(), *args, **kwargs)
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class AudioConversionError(PostProcessingError):
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pass
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