[AVTCORE] SCReAM implementation of draft-ietf-avtcore-cc-feedback-message-02
Ingemar Johansson S <ingemar.s.johansson@ericsson.com> Thu, 06 September 2018 14:00 UTC
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From: Ingemar Johansson S <ingemar.s.johansson@ericsson.com>
To: "rmcat@ietf.org" <rmcat@ietf.org>, "avt@ietf.org" <avt@ietf.org>
CC: Zaheduzzaman Sarker <zaheduzzaman.sarker@ericsson.com>, "avt@ietf.org" <avt@ietf.org>, "varun.singh@iki.fi" <varun.singh@iki.fi>, "mramalho@cisco.com" <mramalho@cisco.com>, "'csp@csperkins.org'" <csp@csperkins.org>
Thread-Topic: SCReAM implementation of draft-ietf-avtcore-cc-feedback-message-02
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Date: Thu, 06 Sep 2018 14:00:21 +0000
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Subject: [AVTCORE] SCReAM implementation of draft-ietf-avtcore-cc-feedback-message-02
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Gentlepeople! The SCReAM implementation found at https://github.com/EricssonResearch/scream now implements https://tools.ietf.org/html/draft-ietf-avtcore-cc-feedback-message-02 Really hope that I got everything right General impressions: 1 The overhead increases a bit as compared to the previous proprietary format, it should not cause too much headache at high media rates but can be a concern over low bitrate links , see https://github.com/EricssonResearch/scream#feedback-format for a few ballpark numbers. I will later see if one can lower the feedback rate or the ACK range. 2 The ACK range is 64 RTP packets, in the absence of packet loss in the feedback path this is a bit overkill, for SCReAM it should suffice with a 16 bit ACK range, there is a certain risk of false loss detection with a reduced ACK range however. 3 I changed the internal time base in the code to 32 bit unsigned Q16 variable, If I understand things this should reflex the middle 32 bits in the 64bit NTP time stamp. The time base was earlier a 64 bit time in microseconds, this change remove a lot of messy conversions and hopefully a few potential bugs. /Ingemar ================================== Ingemar Johansson M.Sc. Master Researcher Ericsson Research Network Protocols & E2E Performance Labratoriegränd 11 971 28, Luleå, Sweden Phone +46-1071 43042 SMS/MMS +46-73 078 3289 ingemar.s.johansson@ericsson.com<mailto:ingemar.s.johansson@ericsson.com> www.ericsson.com Between the wish and the thing the world lies waiting. Cormac McCarthy ==================================
- [AVTCORE] SCReAM implementation of draft-ietf-avt… Ingemar Johansson S