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[fragment,hls,f4m,dash,ism] improve fragment downloading

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- resume immediately
- no need to concatenate segments and decrypt them on every resume
- no need to save temp files for segments

and for hls downloader:
- no need to download keys for segments that already downloaded
This commit is contained in:
Remita Amine
2016-06-28 18:07:50 +01:00
parent 58f6ab72ed
commit 75a2485407
7 changed files with 111 additions and 123 deletions
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34
youtube_dl/downloader/hls.py
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@@ -1,6 +1,5 @@
from __future__ import unicode_literals
import os.path
import re
import binascii
try:
@@ -18,8 +17,6 @@ from ..compat import (
compat_struct_pack,
)
from ..utils import (
encodeFilename,
sanitize_open,
parse_m3u8_attributes,
update_url_query,
)
@@ -103,17 +100,18 @@ class HlsFD(FragmentFD):
media_sequence = 0
decrypt_info = {'METHOD': 'NONE'}
byte_range = {}
frags_filenames = []
frag_index = 0
for line in s.splitlines():
line = line.strip()
if line:
if not line.startswith('#'):
frag_index += 1
if frag_index <= ctx['frag_index']:
continue
frag_url = (
line
if re.match(r'^https?://', line)
else compat_urlparse.urljoin(man_url, line))
frag_name = 'Frag%d' % i
frag_filename = '%s-%s' % (ctx['tmpfilename'], frag_name)
if extra_query:
frag_url = update_url_query(frag_url, extra_query)
count = 0
@@ -122,15 +120,10 @@ class HlsFD(FragmentFD):
headers['Range'] = 'bytes=%d-%d' % (byte_range['start'], byte_range['end'])
while count <= fragment_retries:
try:
success = ctx['dl'].download(frag_filename, {
'url': frag_url,
'http_headers': headers,
})
success, frag_content = self._download_fragment(
ctx, frag_url, info_dict, headers)
if not success:
return False
down, frag_sanitized = sanitize_open(frag_filename, 'rb')
frag_content = down.read()
down.close()
break
except compat_urllib_error.HTTPError as err:
# Unavailable (possibly temporary) fragments may be served.
@@ -139,28 +132,29 @@ class HlsFD(FragmentFD):
# https://github.com/rg3/youtube-dl/issues/10448).
count += 1
if count <= fragment_retries:
self.report_retry_fragment(err, frag_name, count, fragment_retries)
self.report_retry_fragment(err, frag_index, count, fragment_retries)
if count > fragment_retries:
if skip_unavailable_fragments:
i += 1
media_sequence += 1
self.report_skip_fragment(frag_name)
self.report_skip_fragment(frag_index)
continue
self.report_error(
'giving up after %s fragment retries' % fragment_retries)
return False
if decrypt_info['METHOD'] == 'AES-128':
iv = decrypt_info.get('IV') or compat_struct_pack('>8xq', media_sequence)
decrypt_info['KEY'] = decrypt_info.get('KEY') or self.ydl.urlopen(decrypt_info['URI']).read()
frag_content = AES.new(
decrypt_info['KEY'], AES.MODE_CBC, iv).decrypt(frag_content)
ctx['dest_stream'].write(frag_content)
frags_filenames.append(frag_sanitized)
self._append_fragment(ctx, frag_content)
# We only download the first fragment during the test
if test:
break
i += 1
media_sequence += 1
elif line.startswith('#EXT-X-KEY'):
decrypt_url = decrypt_info.get('URI')
decrypt_info = parse_m3u8_attributes(line[11:])
if decrypt_info['METHOD'] == 'AES-128':
if 'IV' in decrypt_info:
@@ -170,7 +164,8 @@ class HlsFD(FragmentFD):
man_url, decrypt_info['URI'])
if extra_query:
decrypt_info['URI'] = update_url_query(decrypt_info['URI'], extra_query)
decrypt_info['KEY'] = self.ydl.urlopen(decrypt_info['URI']).read()
if decrypt_url != decrypt_info['URI']:
decrypt_info['KEY'] = None
elif line.startswith('#EXT-X-MEDIA-SEQUENCE'):
media_sequence = int(line[22:])
elif line.startswith('#EXT-X-BYTERANGE'):
@@ -183,7 +178,4 @@ class HlsFD(FragmentFD):
self._finish_frag_download(ctx)
for frag_file in frags_filenames:
os.remove(encodeFilename(frag_file))
return True