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FileDownloader: Simplify and document

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Philipp Hagemeister 2013-05-05 20:49:42 +02:00
parent 891629c84a
commit b338f1b154
1 changed files with 51 additions and 52 deletions
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95
youtube_dl/FileDownloader.py
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@ -435,47 +435,40 @@ class FileDownloader(object):
return u'[download] %s upload date is not in range %s' % (date_from_str(date).isoformat(), dateRange)
return None
def extract_info(self, url, download = True, ie_name = None):
def extract_info(self, url, download=True, ie_key=None):
'''
Returns a list with a dictionary for each video we find.
If 'download', also downloads the videos.
'''
suitable_found = False
#We copy the original list
ies = list(self._ies)
if ie_name is not None:
#We put in the first place the given info extractor
first_ie = get_info_extractor(ie_name)()
first_ie.set_downloader(self)
ies.insert(0, first_ie)
if ie_key:
ie = get_info_extractor(ie_key)()
ie.set_downloader(self)
ies = [ie]
else:
ies = self._ies
for ie in ies:
# Go to next InfoExtractor if not suitable
if not ie.suitable(url):
continue
# Warn if the _WORKING attribute is False
if not ie.working():
self.report_warning(u'the program functionality for this site has been marked as broken, '
u'and will probably not work. If you want to go on, use the -i option.')
self.report_warning(u'The program functionality for this site has been marked as broken, '
u'and will probably not work.')
# Suitable InfoExtractor found
suitable_found = True
# Extract information from URL and process it
try:
ie_results = ie.extract(url)
if ie_results is None: # Finished already (backwards compatibility; listformats and friends should be moved here)
ie_result = ie.extract(url)
if ie_result is None: # Finished already (backwards compatibility; listformats and friends should be moved here)
break
results = []
for ie_result in ie_results:
if not 'extractor' in ie_result:
#The extractor has already been set somewhere else
if isinstance(ie_result, list):
# Backwards compatibility: old IE result format
ie_result = {
'_type': 'compat_list',
'entries': ie_result,
}
if 'extractor' not in ie_result:
ie_result['extractor'] = ie.IE_NAME
results.append(self.process_ie_result(ie_result, download))
return results
return self.process_ie_result(ie_result, download=download)
except ExtractorError as de: # An error we somewhat expected
self.report_error(compat_str(de), de.format_traceback())
break
@ -485,33 +478,31 @@ class FileDownloader(object):
break
else:
raise
if not suitable_found:
else:
self.report_error(u'no suitable InfoExtractor: %s' % url)
def process_ie_result(self, ie_result, download = True):
def process_ie_result(self, ie_result, download=True):
"""
Take the result of the ie and return a list of videos.
For url elements it will search the suitable ie and get the videos
For playlist elements it will process each of the elements of the 'entries' key
Take the result of the ie(may be modified) and resolve all unresolved
references (URLs, playlist items).
It will also download the videos if 'download'.
Returns the resolved ie_result.
"""
result_type = ie_result.get('_type', 'video') #If not given we suppose it's a video, support the dafault old system
result_type = ie_result.get('_type', 'video') # If not given we suppose it's a video, support the default old system
if result_type == 'video':
if 'playlist' not in ie_result:
#It isn't part of a playlist
# It isn't part of a playlist
ie_result['playlist'] = None
ie_result['playlist_index'] = None
if download:
#Do the download:
self.process_info(ie_result)
return ie_result
elif result_type == 'url':
#We get the video pointed by the url
result = self.extract_info(ie_result['url'], download, ie_name = ie_result['ie_key'])[0]
return result
return self.extract_info(ie_result['url'], download, ie_key=ie_result.get('ie_key'))
elif result_type == 'playlist':
#We process each entry in the playlist
# We process each entry in the playlist
playlist = ie_result.get('title', None) or ie_result.get('id', None)
self.to_screen(u'[download] Downloading playlist: %s' % playlist)
@ -533,20 +524,28 @@ class FileDownloader(object):
for i,entry in enumerate(entries,1):
self.to_screen(u'[download] Downloading video #%s of %s' %(i, n_entries))
entry_result = self.process_ie_result(entry, False)
entry_result['playlist'] = playlist
entry_result['playlist_index'] = i + playliststart
#We must do the download here to correctly set the 'playlist' key
if download:
self.process_info(entry_result)
entry['playlist'] = playlist
entry['playlist_index'] = i + playliststart
entry_result = self.process_ie_result(entry, download=download)
playlist_results.append(entry_result)
result = ie_result.copy()
result['entries'] = playlist_results
return result
ie_result['entries'] = playlist_results
return ie_result
elif result_type == 'compat_list':
def _fixup(r):
r.setdefault('extractor', ie_result['extractor'])
return r
ie_result['entries'] = [
self.process_ie_result(_fixup(r), download=download)
for r in ie_result['entries']
]
return ie_result
else:
raise Exception('Invalid result type: %s' % result_type)
def process_info(self, info_dict):
"""Process a single dictionary returned by an InfoExtractor."""
"""Process a single resolved IE result."""
assert info_dict.get('_type', 'video') == 'video'
#We increment the download the download count here to match the previous behaviour.
self.increment_downloads()