Draft-gentric-avt-rtsp-http-00.txt Tunneling RTSP/RTP/RTCP in HTTP (draft-gentric-avt-rtsp-http-00.txt) Anne Jones, Apple Philippe Gentric, Philips MP4Net.

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Presentation transcript:

draft-gentric-avt-rtsp-http-00.txt Tunneling RTSP/RTP/RTCP in HTTP (draft-gentric-avt-rtsp-http-00.txt) Anne Jones, Apple Philippe Gentric, Philips MP4Net

draft-gentric-avt-rtsp-http-00.txt RTSP (RFC 2326 section ) describes a TCP-based streaming mode (RTSP session control is interleaved with RTP data packets and RTCP control packets)

draft-gentric-avt-rtsp-http-00.txt C->S: SETUP rtsp://foo.com/bar.file RTSP/1.0 CSeq: 2 Transport: RTP/AVP/TCP;interleaved=0-1 S->C: RTSP/ OK CSeq: 2 Date: 05 Jun :57:18 GMT Transport: RTP/AVP/TCP;interleaved=0-1 Session: C->S: PLAY rtsp://foo.com/bar.file RTSP/1.0 CSeq: 3 Session: S->C: RTSP/ OK CSeq: 3 Session: Date: 05 Jun :59:15 GMT RTP-Info: url=rtsp://foo.com/bar.file; seq=232433;rtptime= S->C: $\000{2 byte length}{"length" bytes data, w/RTP header} S->C: $\001{2 byte length}{"length" bytes RTCP packet} RTSP RFC 2326 Section Interleaved RTP/RTCP packets Inside RTSP/TCP

draft-gentric-avt-rtsp-http-00.txt Works fine, except for HTTP-only firewalls This work Extend it for HTTP-only firewalls + Pragmatic approach + traverse ANY firewall NOW, including HTTP 1.0 « Poor » implementations

draft-gentric-avt-rtsp-http-00.txt Motivation/Context ISMA: (Internet Streaming Media Alliance)  Media distribution  Standard based  Basic product requirement

draft-gentric-avt-rtsp-http-00.txt Solution outline: Use HTTP to create 2 channels One Client-to-Server One Server-to-Client Use Cookie to correlate both Server sends its IP address to enable load balancing schemes « Hide » (in Base 64) the client-to-server RTSP syntax to prevent proxies from blocking on it

draft-gentric-avt-rtsp-http-00.txt ClientServer HTTP: GET (with sessionCookie) Reply contains : server IP address (load balancing) RTSP replies Interleaved RTP/RTCP packets (no reply) HTTP: POST (with sessionCookie) contains: base64 encoded RTSP commands Server To Client channel Client To Server channel

draft-gentric-avt-rtsp-http-00.txt Implementation status Has been implemented Has been deployed Works fine

draft-gentric-avt-rtsp-http-00.txt Security issues Same as HTTP Same as RTSP etc … base64 encoding aims at preventing some proxy implementation from blocking on trying to parse RTSP … the mime type can be used for filtering

draft-gentric-avt-rtsp-http-00.txt Traffic on the reflector: suggests use HTTP CONNECT to open tunnel in proxy/firewall (this feature is used for https so unless it is implement with drastic restrictions, it would work ?) More ideas ? How to proceed ?