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