- url = info_dict['url']
- protocol = info_dict.get('protocol')
-
- if url.startswith('rtmp'):
- return RtmpFD
- if protocol == 'm3u8_native':
- return NativeHlsFD
- if (protocol == 'm3u8') or (protocol is None and determine_ext(url) == 'm3u8'):
- return HlsFD
- if url.startswith('mms') or url.startswith('rtsp'):
- return MplayerFD
- if determine_ext(url) == 'f4m':
- return F4mFD
- else:
- return HttpFD
+ protocol = determine_protocol(info_dict)
+ info_dict['protocol'] = protocol
+
+ external_downloader = params.get('external_downloader')
+ if external_downloader is not None:
+ ed = get_external_downloader(external_downloader)
+ if ed.supports(info_dict):
+ return ed
+
+ return PROTOCOL_MAP.get(protocol, HttpFD)
+