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[downloader/dash] Implement dashsegments fd in terms of fragment fd

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This commit is contained in:
remitamine 2016-02-09 17:25:02 +01:00
parent d413095f7e
commit c43fe0268c
1 changed files with 35 additions and 44 deletions
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77
youtube_dl/downloader/dash.py
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@ -1,67 +1,58 @@
from __future__ import unicode_literals from __future__ import unicode_literals
import os
import re import re
from .common import FileDownloader from .fragment import FragmentFD
from ..utils import sanitized_Request from ..utils import (
sanitize_open,
encodeFilename,
)
class DashSegmentsFD(FileDownloader): class DashSegmentsFD(FragmentFD):
""" """
Download segments in a DASH manifest Download segments in a DASH manifest
""" """
FD_NAME = 'dashsegments'
def real_download(self, filename, info_dict): def real_download(self, filename, info_dict):
self.report_destination(filename)
tmpfilename = self.temp_name(filename)
base_url = info_dict['url'] base_url = info_dict['url']
segment_urls = info_dict['segment_urls'] segment_urls = [info_dict['segment_urls'][0]] if self.params.get('test', False) else info_dict['segment_urls']
initialization_url = info_dict.get('initialization_url')
is_test = self.params.get('test', False) ctx = {
remaining_bytes = self._TEST_FILE_SIZE if is_test else None 'filename': filename,
byte_counter = 0 'total_frags': len(segment_urls) + (1 if initialization_url else 0),
}
def append_url_to_file(outf, target_url, target_name, remaining_bytes=None): self._prepare_and_start_frag_download(ctx)
self.to_screen('[DashSegments] %s: Downloading %s' % (info_dict['id'], target_name))
req = sanitized_Request(target_url)
if remaining_bytes is not None:
req.add_header('Range', 'bytes=0-%d' % (remaining_bytes - 1))
data = self.ydl.urlopen(req).read()
if remaining_bytes is not None:
data = data[:remaining_bytes]
outf.write(data)
return len(data)
def combine_url(base_url, target_url): def combine_url(base_url, target_url):
if re.match(r'^https?://', target_url): if re.match(r'^https?://', target_url):
return target_url return target_url
return '%s%s%s' % (base_url, '' if base_url.endswith('/') else '/', target_url) return '%s%s%s' % (base_url, '' if base_url.endswith('/') else '/', target_url)
with open(tmpfilename, 'wb') as outf: segments_filenames = []
if info_dict.get('initialization_url'): def append_url_to_file(target_url, target_filename):
append_url_to_file( success = ctx['dl'].download(target_filename, {'url': combine_url(base_url, target_url)})
outf, combine_url(base_url, info_dict['initialization_url']), if not success:
'initialization segment') return False
down, target_sanitized = sanitize_open(target_filename, 'rb')
ctx['dest_stream'].write(down.read())
down.close()
segments_filenames.append(target_sanitized)
if initialization_url:
append_url_to_file(initialization_url, ctx['tmpfilename'] + '-Init')
for i, segment_url in enumerate(segment_urls): for i, segment_url in enumerate(segment_urls):
segment_len = append_url_to_file( segment_filename = '%s-Seg%d' % (ctx['tmpfilename'], i)
outf, combine_url(base_url, segment_url), append_url_to_file(segment_url, segment_filename)
'segment %d / %d' % (i + 1, len(segment_urls)),
remaining_bytes)
byte_counter += segment_len
if remaining_bytes is not None:
remaining_bytes -= segment_len
if remaining_bytes <= 0:
break
self.try_rename(tmpfilename, filename) self._finish_frag_download(ctx)
self._hook_progress({ for segment_file in segments_filenames:
'downloaded_bytes': byte_counter, os.remove(encodeFilename(segment_file))
'total_bytes': byte_counter,
'filename': filename,
'status': 'finished',
})
return True return True