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from __future__ import unicode_literals
import copy
import functools
import os
from ..compat import compat_str
from ..utils import (
_configuration_args,
encodeFilename,
PostProcessingError,
)
class PostProcessorMetaClass(type):
@staticmethod
def run_wrapper(func):
@functools.wraps(func)
def run(self, info, *args, **kwargs):
info_copy = copy.deepcopy(self._copy_infodict(info))
self._hook_progress({'status': 'started'}, info_copy)
ret = func(self, info, *args, **kwargs)
if ret is not None:
_, info = ret
self._hook_progress({'status': 'finished'}, info_copy)
return ret
return run
def __new__(cls, name, bases, attrs):
if 'run' in attrs:
attrs['run'] = cls.run_wrapper(attrs['run'])
return type.__new__(cls, name, bases, attrs)
class PostProcessor(metaclass=PostProcessorMetaClass):
"""Post Processor class.
PostProcessor objects can be added to downloaders with their
add_post_processor() method. When the downloader has finished a
successful download, it will take its internal chain of PostProcessors
and start calling the run() method on each one of them, first with
an initial argument and then with the returned value of the previous
PostProcessor.
The chain will be stopped if one of them ever returns None or the end
of the chain is reached.
PostProcessor objects follow a "mutual registration" process similar
to InfoExtractor objects.
Optionally PostProcessor can use a list of additional command-line arguments
with self._configuration_args.
"""
_downloader = None
def __init__(self, downloader=None):
self._progress_hooks = []
self.add_progress_hook(self.report_progress)
self.set_downloader(downloader)
self.PP_NAME = self.pp_key()
@classmethod
def pp_key(cls):
name = cls.__name__[:-2]
return compat_str(name[6:]) if name[:6].lower() == 'ffmpeg' else name
def to_screen(self, text, prefix=True, *args, **kwargs):
tag = '[%s] ' % self.PP_NAME if prefix else ''
if self._downloader:
return self._downloader.to_screen('%s%s' % (tag, text), *args, **kwargs)
def report_warning(self, text, *args, **kwargs):
if self._downloader:
return self._downloader.report_warning(text, *args, **kwargs)
def report_error(self, text, *args, **kwargs):
# Exists only for compatibility. Do not use
if self._downloader:
return self._downloader.report_error(text, *args, **kwargs)
def write_debug(self, text, *args, **kwargs):
if self._downloader:
return self._downloader.write_debug(text, *args, **kwargs)
def get_param(self, name, default=None, *args, **kwargs):
if self._downloader:
return self._downloader.params.get(name, default, *args, **kwargs)
return default
def set_downloader(self, downloader):
"""Sets the downloader for this PP."""
self._downloader = downloader
for ph in getattr(downloader, '_postprocessor_hooks', []):
self.add_progress_hook(ph)
def _copy_infodict(self, info_dict):
return getattr(self._downloader, '_copy_infodict', dict)(info_dict)
@staticmethod
def _restrict_to(*, video=True, audio=True, images=True):
allowed = {'video': video, 'audio': audio, 'images': images}
def decorator(func):
@functools.wraps(func)
def wrapper(self, info):
format_type = (
'video' if info.get('vcodec') != 'none'
else 'audio' if info.get('acodec') != 'none'
else 'images')
if allowed[format_type]:
return func(self, info)
else:
self.to_screen('Skipping %s' % format_type)
return [], info
return wrapper
return decorator
def run(self, information):
"""Run the PostProcessor.
The "information" argument is a dictionary like the ones
composed by InfoExtractors. The only difference is that this
one has an extra field called "filepath" that points to the
downloaded file.
This method returns a tuple, the first element is a list of the files
that can be deleted, and the second of which is the updated
information.
In addition, this method may raise a PostProcessingError
exception if post processing fails.
"""
return [], information # by default, keep file and do nothing
def try_utime(self, path, atime, mtime, errnote='Cannot update utime of file'):
try:
os.utime(encodeFilename(path), (atime, mtime))
except Exception:
self.report_warning(errnote)
def _configuration_args(self, exe, *args, **kwargs):
return _configuration_args(
self.pp_key(), self.get_param('postprocessor_args'), exe, *args, **kwargs)
def _hook_progress(self, status, info_dict):
if not self._progress_hooks:
return
status.update({
'info_dict': info_dict,
'postprocessor': self.pp_key(),
})
for ph in self._progress_hooks:
ph(status)
def add_progress_hook(self, ph):
# See YoutubeDl.py (search for postprocessor_hooks) for a description of this interface
self._progress_hooks.append(ph)
def report_progress(self, s):
s['_default_template'] = '%(postprocessor)s %(status)s' % s
progress_dict = s.copy()
progress_dict.pop('info_dict')
progress_dict = {'info': s['info_dict'], 'progress': progress_dict}
progress_template = self.get_param('progress_template', {})
tmpl = progress_template.get('postprocess')
if tmpl:
self._downloader.to_stdout(self._downloader.evaluate_outtmpl(tmpl, progress_dict))
self._downloader.to_console_title(self._downloader.evaluate_outtmpl(
progress_template.get('postprocess-title') or 'hypervideo %(progress._default_template)s',
progress_dict))
class AudioConversionError(PostProcessingError):
pass
|
