[AVTCORE] SDP directorate review of draft-ietf-payload-rtp-jpegxs-13

Christer Holmberg <christer.holmberg@ericsson.com> Mon, 17 May 2021 14:24 UTC

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From: Christer Holmberg <christer.holmberg@ericsson.com>
To: IETF AVTCore WG <avt@ietf.org>
CC: "avtcore-chairs@ietf.org" <avtcore-chairs@ietf.org>, "Murray S. Kucherawy" <superuser@gmail.com>, mmusic <mmusic@ietf.org>
Thread-Topic: SDP directorate review of draft-ietf-payload-rtp-jpegxs-13
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Date: Mon, 17 May 2021 14:24:17 +0000
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Subject: [AVTCORE] SDP directorate review of draft-ietf-payload-rtp-jpegxs-13
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Hi,

I have performed the SDP directorate review of draft-ietf-payload-rtp-jpegxs-13.

Regards,

Christer

----

Q.1

I suggest converting section 7.2 to a separate main section, and change the name to "SDP Offer/Answer Considerations". I don't think we need to consider other SDP usage than Offer/Answer.


Q.2. Regarding section 7.2.1.:


    "A Session Description Protocol (SDP) [RFC8866] media description SHALL be created for each RTP stream."

This sentence is not needed.


     "The information carried in the media type specification of
      Section 7.1 has a specific mapping to the SDP fields, used to
      describe RTP sessions.  This information is redundant with the
      information found in the payload data (namely, in the JPEG XS header
      segment) and SHALL be consistent with it."

In SDP offer/answer, you typically indicate what you are willing to RECEIVE. In this case it seems like you indicate what you are going to SEND. Is there a reason for that? I guess that impacts Section 7.2.3 too.


Q.3. Regarding Section 7.2.3.:

     "All parameters must be supported by both sides,"

In Section 7.2.1 you say that the receiver shall ignore unrecognized parameters. I ASSUME that you mean that the all the parameter defined in Section 7.2.1.

      "i.e. the answerer SHALL either maintain all parameters or remove the media format (payload
       type) completely if one or more of the parameter values are not
       supported."

I don't understand what this mean. According to Section 7.2.1, some of the parameters are OPTIONAL. Is the answerer only allowed to reply with parameters that were present in the offer?