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[extractor/common] Document _type values (Motivated by #4254)

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Philipp Hagemeister 2014-11-20 16:47:59 +01:00
parent 6adeffa7c6
commit fed5d03260
1 changed files with 37 additions and 1 deletions
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38
youtube_dl/extractor/common.py
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@ -43,7 +43,11 @@ class InfoExtractor(object):
information possibly downloading the video to the file system, among
other possible outcomes.
The dictionaries must include the following fields:
The type field determines the the type of the result.
By far the most common value (and the default if _type is missing) is
"video", which indicates a single video.
For a video, the dictionaries must include the following fields:
id: Video identifier.
title: Video title, unescaped.
@ -151,6 +155,38 @@ class InfoExtractor(object):
Unless mentioned otherwise, None is equivalent to absence of information.
_type "playlist" indicates multiple videos.
There must be a key "entries", which is a list or a PagedList object, each
element of which is a valid dictionary under this specfication.
Additionally, playlists can have "title" and "id" attributes with the same
semantics as videos (see above).
_type "multi_video" indicates that there are multiple videos that
form a single show, for examples multiple acts of an opera or TV episode.
It must have an entries key like a playlist and contain all the keys
required for a video at the same time.
_type "url" indicates that the video must be extracted from another
location, possibly by a different extractor. Its only required key is:
"url" - the next URL to extract.
Additionally, it may have properties believed to be identical to the
resolved entity, for example "title" if the title of the referred video is
known ahead of time.
_type "url_transparent" entities have the same specification as "url", but
indicate that the given additional information is more precise than the one
associated with the resolved URL.
This is useful when a site employs a video service that hosts the video and
its technical metadata, but that video service does not embed a useful
title, description etc.
Subclasses of this one should re-define the _real_initialize() and
_real_extract() methods and define a _VALID_URL regexp.
Probably, they should also be added to the list of extractors.