[MMUSIC] Crazy SDP based on a=rid lack of syntax restrictions.
Magnus Westerlund <magnus.westerlund@ericsson.com> Tue, 05 May 2020 09:16 UTC
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From: Magnus Westerlund <magnus.westerlund@ericsson.com>
To: "mmusic@ietf.org" <mmusic@ietf.org>
Thread-Topic: Crazy SDP based on a=rid lack of syntax restrictions.
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Date: Tue, 05 May 2020 09:16:40 +0000
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Subject: [MMUSIC] Crazy SDP based on a=rid lack of syntax restrictions.
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Hi, I sent an email on this already to C238 mailing list. However, I don't know if got caught in the spam filters for people. Or that people don't know that things may actually need feedback on postings on that list. I recommend people on that list to keep their eyes open as we likely have some things for simulcast that we need to share. So in the context of a=rid's syntax rules (See https://datatracker.ietf.org/doc/draft-ietf-mmusic-rid/) You can also view it as an another installment in Cullen's how big can SDP become? I think we still should have put in upper boundary for parameters in the ABNF syntax in the RID (RFC8851). For example the rid-id we know have an implicit upper boundary of 255 bytes otherwise it will not be possible to send as an SDES item. And those integers for parameters (int-param-val) where catering for 64- bit integers should be enough for all eternity. I guess this is a ship that sailed. However, I do hope that your SDP parsers are capable of processing this below example SDP snippet that I believe is syntactically correct and gives OPUS a very high upper limit in bandwidth, i.e. restricted by codec and not RID parameter. The value in the max-br parameter is Coleridge’s Rime of the Ancient mariner( https://www.poetryfoundation.org/poems/43997/the-rime-of-the-ancient-mariner-text-of-1834) in ASCII where each ascii character has been converted to octal encoding. It is 55828 DIGITs. m=audio 49200 RTP/AVP 97 98 99 100 101 102 a=mid:foo a=rtpmap:97 G711/8000 a=rtpmap:98 LPC/8000 a=rtpmap:99 OPUS/48000/1 a=rtpmap:100 RED/8000/1 a=rtpmap:101 CN/8000 a=rtpmap:102 telephone-event/8000 a=fmtp:99 useinbandfec=1; usedtx=0 a=fmtp:100 97/98 a=fmtp:102 0-15 a=ptime:20 a=maxptime:40 a=rid:5 send pt=99,102;max-br=64000 a=rid:6 send pt=100,97,101,102 a=rid:7 send pt=99;max- br=12010112212440111121111644015116340141156401411561431511451561644011514116215 11561451625412101156144401501454016316415716016014516415040157156145401571464016 41501621451455612471021714016415017140154157156147401471621451714014214514116214 44014115614440147154151164164145162151156147401451711455412116157167401671501451 62145146157162145401631641571601604716316440164150157165401551457712121241501454 01021621511441451471621571571554716340144157157162163401411621454015716014515614 51444016715114414554121011561444011140141155401561451701644015714640153151156731 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14540151163401501571411625412111163401471571561457240141156144401561571674016415 01454012714514414415115614755107165145163164121241651621561451444014616215715540 16415014540142162151144145147162157157155471634014415715716256121211014540167145 15616440154151153145401571561454016415014116440150141164150401421451451564016316 41651561561451445412101156144401511634015714640163145156163145401461571621541571 62156721210140163141144144145162401411561444014140167151163145162401551411565412 11014540162157163145401641501454015515716216215716740155157162156561212 Cheers Magnus Westerlund -- Cheers Magnus Westerlund ---------------------------------------------------------------------- Networks, Ericsson Research ---------------------------------------------------------------------- Ericsson AB | Phone +46 10 7148287 Torshamnsgatan 23 | Mobile +46 73 0949079 SE-164 80 Stockholm, Sweden | mailto: magnus.westerlund@ericsson.com ----------------------------------------------------------------------
- [MMUSIC] Crazy SDP based on a=rid lack of syntax … Magnus Westerlund