116 lines
4.5 KiB
Python
116 lines
4.5 KiB
Python
from __future__ import unicode_literals
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import itertools
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import re
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import time
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import xml.etree.ElementTree as etree
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from .common import FileDownloader
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from ..compat import (
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compat_str,
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compat_urllib_request,
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)
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from ..utils import (
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parse_iso8601,
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xpath_with_ns,
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)
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class DashSegmentsFD(FileDownloader):
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"""
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Download segments in a DASH manifest
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"""
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def real_download(self, filename, info_dict):
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self.report_destination(filename)
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tmpfilename = self.temp_name(filename)
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is_test = self.params.get('test', False)
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remaining_bytes = self._TEST_FILE_SIZE if is_test else None
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byte_counter = 0
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def append_url_to_file(outf, target_url, target_name, remaining_bytes=None):
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self.to_screen('[DashSegments] %s: Downloading %s' % (info_dict['id'], target_name))
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req = compat_urllib_request.Request(target_url)
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if remaining_bytes is not None:
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req.add_header('Range', 'bytes=0-%d' % (remaining_bytes - 1))
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data = self.ydl.urlopen(req).read()
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if remaining_bytes is not None:
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data = data[:remaining_bytes]
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outf.write(data)
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return len(data)
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if not info_dict.get('is_live'):
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base_url = info_dict['url']
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segment_urls = info_dict['segment_urls']
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def combine_url(base_url, target_url):
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if re.match(r'^https?://', target_url):
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return target_url
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return '%s/%s' % (base_url, target_url)
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init_url = combine_url(base_url, info_dict['initialization_url'])
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segment_urls = [combine_url(base_url, segment_url) for segment_url in segment_urls]
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else:
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manifest_url = info_dict['url']
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manifest_xml = self.ydl.urlopen(manifest_url).read()
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manifest = etree.fromstring(manifest_xml)
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_x = lambda p: xpath_with_ns(p, {'ns': 'urn:mpeg:DASH:schema:MPD:2011'})
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ad = [e for e in manifest.findall(_x('ns:Period/ns:AdaptationSet')) if e.attrib['id'] == info_dict['mpd_set_id']][0]
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segment_template = ad.find(_x('ns:SegmentTemplate'))
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def subs_url_template(url_template, repr_id, number=None):
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result = url_template.replace('$RepresentationID$', repr_id)
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if number is not None:
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result = result.replace('$Number$', compat_str(number))
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return result
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start_time = parse_iso8601(manifest.attrib['availabilityStartTime'])
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segment_duration = (int(segment_template.attrib['duration']) / int(segment_template.attrib['timescale'])) # in seconds
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first_segment = int((int(time.time()) - start_time) / segment_duration)
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init_url = subs_url_template(segment_template.attrib['initialization'], '1')
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def build_live_segment_urls():
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for nr in itertools.count(first_segment):
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# We have to avoid requesting a segment before its start time
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expected_time = start_time + nr * segment_duration
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wait_time = expected_time - time.time()
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if wait_time > 0:
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time.sleep(wait_time)
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yield subs_url_template(segment_template.attrib['media'], '1', nr)
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segment_urls = build_live_segment_urls()
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with open(tmpfilename, 'wb') as outf:
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append_url_to_file(
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outf, init_url,
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'initialization segment')
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for i, segment_url in enumerate(segment_urls):
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note = 'segment %d' % (i + 1)
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if not info_dict.get('is_live'):
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note += ' / %d' % len(segment_urls)
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segment_len = append_url_to_file(
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outf, segment_url, note, remaining_bytes)
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byte_counter += segment_len
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self._hook_progress({
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'status': 'downloading',
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'downloaded_bytes': byte_counter,
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'filename': filename,
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})
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if remaining_bytes is not None:
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remaining_bytes -= segment_len
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if remaining_bytes <= 0:
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break
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self.try_rename(tmpfilename, filename)
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self._hook_progress({
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'downloaded_bytes': byte_counter,
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'total_bytes': byte_counter,
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'filename': filename,
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'status': 'finished',
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})
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return True
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