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[f4m] Refresh fragment list periodically on live streams

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This commit is contained in:
Antti Ajanki 2015-02-22 21:03:49 +02:00
parent 6f4ba54079
commit c4f8c453ae
1 changed files with 49 additions and 10 deletions
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57
youtube_dl/downloader/f4m.py
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@ -121,7 +121,8 @@ class FlvReader(io.BytesIO):
self.read_unsigned_int() # BootstrapinfoVersion
# Profile,Live,Update,Reserved
self.read(1)
flags = self.read_unsigned_char()
live = flags & 0x20 != 0
# time scale
self.read_unsigned_int()
# CurrentMediaTime
@ -160,6 +161,7 @@ class FlvReader(io.BytesIO):
return {
'segments': segments,
'fragments': fragments,
'live': live,
}
def read_bootstrap_info(self):
@ -182,6 +184,10 @@ def build_fragments_list(boot_info):
for segment, fragments_count in segment_run_table['segment_run']:
for _ in range(fragments_count):
res.append((segment, next(fragments_counter)))
if boot_info['live']:
res = res[-2:]
return res
@ -246,6 +252,38 @@ class F4mFD(FileDownloader):
self.report_error('Unsupported DRM')
return media
def _get_bootstrap_from_url(self, bootstrap_url):
bootstrap = self.ydl.urlopen(bootstrap_url).read()
return read_bootstrap_info(bootstrap)
def _update_live_fragments(self, bootstrap_url, latest_fragment):
fragments_list = []
retries = 30
while (not fragments_list) and (retries > 0):
boot_info = self._get_bootstrap_from_url(bootstrap_url)
fragments_list = build_fragments_list(boot_info)
fragments_list = [f for f in fragments_list if f[1] > latest_fragment]
if not fragments_list:
# Retry after a while
time.sleep(5.0)
retries -= 1
if not fragments_list:
self.report_error('Failed to update fragments')
return fragments_list
def _parse_bootstrap_node(self, node, base_url):
if node.text is None:
bootstrap_url = compat_urlparse.urljoin(
base_url, node.attrib['url'])
boot_info = self._get_bootstrap_from_url(bootstrap_url)
else:
bootstrap_url = None
bootstrap = base64.b64decode(node.text)
boot_info = read_bootstrap_info(bootstrap)
return (boot_info, bootstrap_url)
def real_download(self, filename, info_dict):
man_url = info_dict['url']
requested_bitrate = info_dict.get('tbr')
@ -265,18 +303,13 @@ class F4mFD(FileDownloader):
base_url = compat_urlparse.urljoin(man_url, media.attrib['url'])
bootstrap_node = doc.find(_add_ns('bootstrapInfo'))
if bootstrap_node.text is None:
bootstrap_url = compat_urlparse.urljoin(
base_url, bootstrap_node.attrib['url'])
bootstrap = self.ydl.urlopen(bootstrap_url).read()
else:
bootstrap = base64.b64decode(bootstrap_node.text)
boot_info, bootstrap_url = self._parse_bootstrap_node(bootstrap_node, base_url)
live = boot_info['live']
metadata_node = media.find(_add_ns('metadata'))
if metadata_node is not None:
metadata = base64.b64decode(metadata_node.text)
else:
metadata = None
boot_info = read_bootstrap_info(bootstrap)
fragments_list = build_fragments_list(boot_info)
if self.params.get('test', False):
@ -301,6 +334,7 @@ class F4mFD(FileDownloader):
(dest_stream, tmpfilename) = sanitize_open(tmpfilename, 'wb')
write_flv_header(dest_stream)
if not live:
write_metadata_tag(dest_stream, metadata)
# This dict stores the download progress, it's updated by the progress
@ -348,7 +382,8 @@ class F4mFD(FileDownloader):
http_dl.add_progress_hook(frag_progress_hook)
frags_filenames = []
for (seg_i, frag_i) in fragments_list:
while fragments_list:
seg_i, frag_i = fragments_list.pop(0)
name = 'Seg%d-Frag%d' % (seg_i, frag_i)
url = base_url + name
if akamai_pv:
@ -367,6 +402,10 @@ class F4mFD(FileDownloader):
break
frags_filenames.append(frag_filename)
if not fragments_list and live and bootstrap_url:
fragments_list = self._update_live_fragments(bootstrap_url, frag_i)
self.to_screen('Updated available fragments: %d' % len(fragments_list))
dest_stream.close()
elapsed = time.time() - start