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): self._hook_progress({'status': 'started'}, info) ret = func(self, info, *args, **kwargs) if ret is not None: _, info = ret self._hook_progress({'status': 'finished'}, info) 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) @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 info_dict = dict(info_dict) for key in ('__original_infodict', '__postprocessors'): info_dict.pop(key, None) status.update({ 'info_dict': copy.deepcopy(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 'yt-dlp %(progress._default_template)s', progress_dict)) class AudioConversionError(PostProcessingError): pass