278 líneas
8,6 KiB
Python
Archivo ejecutable
278 líneas
8,6 KiB
Python
Archivo ejecutable
#!/usr/bin/env python3
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'''
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Feed parser with many features
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from a feed, it supports filtering, subslicing, random picking
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Beside feeds, it supports picking files from directories
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'''
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import os
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import logging
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from argparse import ArgumentParser
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from subprocess import check_output
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from collections import OrderedDict
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import re
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import urllib.request
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from urllib.parse import urlparse, unquote
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import posixpath
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import random
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from bisect import bisect
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from lxml import html
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import requests
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def weighted_choice(values, weights):
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'''
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random.choice with weights
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weights must be integers greater than 0.
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Their meaning is "relative", that is [1,2,3] is the same as [2,4,6]
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'''
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assert len(values) == len(weights)
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total = 0
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cum_weights = []
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for w in weights:
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total += w
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cum_weights.append(total)
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x = random.random() * total
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i = bisect(cum_weights, x)
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return values[i]
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class Audio(object):
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def __init__(self, url, duration=None):
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self.url = url
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if duration is None:
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duration = get_duration(url.encode('utf-8'))
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self.duration = duration
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def __str__(self):
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return self.url
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def __repr__(self):
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return '<Audio {} ({})>'.format(self.url, self.duration)
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@property
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def urls(self):
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return [self.url]
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class AudioGroup(list):
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def __init__(self, description=None):
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self.description = description or ''
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self.audios = []
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def __len__(self):
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return len(self.audios)
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def append(self, arg):
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self.audios.append(arg)
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def __str__(self):
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return '\n'.join(str(a) for a in self.audios)
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def __repr__(self):
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return '<AudioGroup "{}" ({})\n{} >'.\
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format(self.description, self.duration,
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'\n'.join(' ' + repr(a) for a in self.audios))
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@property
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def duration(self):
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return sum(a.duration for a in self.audios if a.duration is not None)
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@property
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def urls(self):
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return [a.url for a in self.audios]
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def get_tree(feed_url):
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if feed_url.startswith('http:') or feed_url.startswith('https:'):
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tree = html.fromstring(requests.get(feed_url).content)
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else:
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if not os.path.exists(feed_url):
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raise ValueError("file not found: {}".format(feed_url))
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tree = html.parse(open(feed_url))
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return tree
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def get_audio_from_description(text):
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# non-empty lines
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lines = [line.strip()
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for line in text.split('\n')
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if line.strip()]
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url = lines[0]
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duration = None
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if len(lines) > 1:
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duration = int(re.findall(r'\d+', lines[1].split('=')[1].strip())[0])
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return Audio(unquote(url), duration)
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# copied from larigira.fsutils
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def scan_dir_audio(dirname, extensions=('mp3', 'oga', 'wav', 'ogg')):
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for root, dirnames, filenames in os.walk(dirname):
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for fname in filenames:
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if fname.split('.')[-1].lower() in extensions:
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yield os.path.join(root, fname)
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def get_audio_from_dir(dirpath):
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fpaths = scan_dir_audio(dirpath)
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return [Audio('file://' + os.path.realpath(u)) for u in fpaths]
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def get_urls(tree):
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urls = tree.xpath('//item/description')
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for url_elem in urls:
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yield get_audio_from_description(url_elem.text)
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def get_grouped_urls(tree):
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groups = OrderedDict()
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items = tree.xpath('//item')
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for item in items:
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guid = item.xpath('guid')[0].text.strip()
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if guid not in groups:
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groups[guid] = AudioGroup(guid)
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groups[guid].append(get_audio_from_description(
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item.xpath('description')[0].text))
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return groups
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def get_duration(url):
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lineout = check_output(['ffprobe', '-v', 'error',
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'-show_entries', 'format=duration',
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'-i', url]).split(b'\n')
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duration = next(l for l in lineout if l.startswith(b'duration='))
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value = duration.split(b'=')[1]
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return int(float(value))
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def get_parser():
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p = ArgumentParser('Get music from a (well-specified) xml feed')
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src = p.add_argument_group('sources', 'How to deal with sources')
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p.add_argument('--source-weights',
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help='Select only one "source" based on this weights')
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filters = p.add_argument_group('filters', 'Select only items that match these conditions')
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filters.add_argument('--max-len', default=0, type=int,
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help='Exclude any audio that is longer than MAXLEN seconds')
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filters.add_argument('--random', default=False,
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action='store_true', help='Pick randomly')
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p.add_argument('--start', default=0, type=int,
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help='0-indexed start number. '
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'By default, play from most recent')
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p.add_argument('--howmany', default=1, type=int,
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help='If not specified, only 1 will be played')
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p.add_argument('--slotsize', help='Seconds between each audio', type=int)
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p.add_argument('--group', help='Group articles', default=False,
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action='store_true')
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p.add_argument('--copy', help='Copy files to $TMPDIR', default=False,
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action='store_true')
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p.add_argument('--debug', help='Debug messages', default=False,
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action='store_true')
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p.add_argument('urls', metavar='URL', nargs='+')
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return p
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def put(audio, copy=False):
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if not copy:
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for url in audio.urls:
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print(url)
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else:
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for url in audio.urls:
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if url.split(':')[0] in ('http', 'https'):
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destdir = (os.environ.get('TMPDIR', '.'))
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fname = posixpath.basename(urlparse(url).path)
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# sanitize
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fname = "".join(c for c in fname
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if c.isalnum() or c in list('._-')).rstrip()
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dest = os.path.join(destdir, fname)
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os.makedirs(destdir, exist_ok=True)
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fname, headers = urllib.request.urlretrieve(url, dest)
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print('file://%s' % os.path.realpath(fname))
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else:
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# FIXME: file:// urls are just copied
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print(url)
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def main():
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parser = get_parser()
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args = parser.parse_args()
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if not args.debug:
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logging.basicConfig(level=logging.WARNING)
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else:
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logging.basicConfig(level=logging.DEBUG)
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sources = args.urls
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if args.source_weights:
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weights = tuple(map(int, args.source_weights.split(':')))
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if len(weights) != len(sources):
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parser.exit(status=2, message='Weight must be in the'
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' same number as sources\n')
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sources = [weighted_choice(sources, weights)]
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audios = []
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for url in sources:
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if url.startswith('http:') or url.startswith('https:') \
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or os.path.isfile(url):
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# download the feed
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tree = get_tree(url)
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if not args.group:
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# get audio urls, removing those that are too long
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audios += [audio for audio in get_urls(tree)
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if args.max_len == 0 or
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audio.duration <= args.max_len]
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else:
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groups = get_grouped_urls(tree)
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audios += [groups[g] for g in groups.keys()
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if args.max_len == 0 or
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groups[g].duration <= args.max_len
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]
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elif os.path.isdir(url):
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audiodir = get_audio_from_dir(url)
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if not args.group:
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audios += audiodir
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else:
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for a in audiodir:
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ag = AudioGroup(os.path.basename(a.url))
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ag.append(a)
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audios.append(ag)
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else:
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logging.info('unsupported url `%s`', url)
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audios = audios[args.start:]
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if args.random:
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random.shuffle(audios)
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audios = audios[:args.howmany]
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# the for loop excludes the last one
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# this is to support the --slotsize option
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if not audios:
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return
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for audio in audios[:-1]:
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if args.debug:
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print(repr(audio))
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else:
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put(audio, args.copy)
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if args.slotsize is not None:
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duration = audio.duration
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if duration < args.slotsize:
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print('## musica per {} secondi'
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.format(args.slotsize - duration))
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# finally, the last one
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if args.debug:
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print(repr(audios[-1]))
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else:
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put(audios[-1], args.copy)
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# else: # grouping; TODO: support slotsize
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# for item in groups:
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# if args.debug:
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# print('#', item, groups[item].duration)
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# print(groups[item])
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if __name__ == '__main__':
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main()
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