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[mixcloud] Simplify url extraction

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On the tracks I tested the server number in the url from the webpage is valid
for the mp3 or the m4a file and any other number is invalid, it's a
waste of time to check them.
This commit is contained in:
Jaime Marquínez Ferrándiz 2015-04-17 19:02:49 +02:00
parent d8e7ef04dc
commit c5826a491b
1 changed files with 15 additions and 57 deletions
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72
youtube_dl/extractor/mixcloud.py
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@ -1,7 +1,6 @@
from __future__ import unicode_literals
import re
import itertools
from .common import InfoExtractor
from ..compat import (
@ -46,20 +45,16 @@ class MixcloudIE(InfoExtractor):
},
}]
def _get_url(self, track_id, template_url, server_number):
boundaries = (1, 30)
for nr in server_numbers(server_number, boundaries):
url = template_url % nr
try:
# We only want to know if the request succeed
# don't download the whole file
self._request_webpage(
HEADRequest(url), track_id,
'Checking URL %d/%d ...' % (nr, boundaries[-1]))
return url
except ExtractorError:
pass
return None
def _check_url(self, url, track_id, ext):
try:
# We only want to know if the request succeed
# don't download the whole file
self._request_webpage(
HEADRequest(url), track_id,
'Trying %s URL' % ext)
return True
except ExtractorError:
return False
def _real_extract(self, url):
mobj = re.match(self._VALID_URL, url)
@ -72,15 +67,10 @@ def _real_extract(self, url):
preview_url = self._search_regex(
r'\s(?:data-preview-url|m-preview)="([^"]+)"', webpage, 'preview url')
song_url = preview_url.replace('/previews/', '/c/originals/')
server_number = int(self._search_regex(r'stream(\d+)', song_url, 'server number'))
template_url = re.sub(r'(stream\d*)', 'stream%d', song_url)
final_song_url = self._get_url(track_id, template_url, server_number)
if final_song_url is None:
self.to_screen('Trying with m4a extension')
template_url = template_url.replace('.mp3', '.m4a').replace('originals/', 'm4a/64/')
final_song_url = self._get_url(track_id, template_url, server_number)
if final_song_url is None:
raise ExtractorError('Unable to extract track url')
if not self._check_url(song_url, track_id, 'mp3'):
song_url = song_url.replace('.mp3', '.m4a').replace('originals/', 'm4a/64/')
if not self._check_url(song_url, track_id, 'm4a'):
raise ExtractorError('Unable to extract track url')
PREFIX = (
r'm-play-on-spacebar[^>]+'
@ -107,7 +97,7 @@ def _real_extract(self, url):
return {
'id': track_id,
'title': title,
'url': final_song_url,
'url': song_url,
'description': description,
'thumbnail': thumbnail,
'uploader': uploader,
@ -115,35 +105,3 @@ def _real_extract(self, url):
'view_count': view_count,
'like_count': like_count,
}
def server_numbers(first, boundaries):
""" Server numbers to try in descending order of probable availability.
Starting from first (i.e. the number of the server hosting the preview file)
and going further and further up to the higher boundary and down to the
lower one in an alternating fashion. Namely:
server_numbers(2, (1, 5))
# Where the preview server is 2, min number is 1 and max is 5.
# Yields: 2, 3, 1, 4, 5
Why not random numbers or increasing sequences? Since from what I've seen,
full length files seem to be hosted on servers whose number is closer to
that of the preview; to be confirmed.
"""
zip_longest = getattr(itertools, 'zip_longest', None)
if zip_longest is None:
# python 2.x
zip_longest = itertools.izip_longest
if len(boundaries) != 2:
raise ValueError("boundaries should be a two-element tuple")
min, max = boundaries
highs = range(first + 1, max + 1)
lows = range(first - 1, min - 1, -1)
rest = filter(
None, itertools.chain.from_iterable(zip_longest(highs, lows)))
yield first
for n in rest:
yield n