Re: [MMUSIC] Review of 4566bis
Christer Holmberg <christer.holmberg@ericsson.com> Tue, 02 June 2015 15:24 UTC
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From: Christer Holmberg <christer.holmberg@ericsson.com>
To: Paul Kyzivat <pkyzivat@alum.mit.edu>, Roni Even <ron.even.tlv@gmail.com>, "mmusic@ietf.org" <mmusic@ietf.org>
Thread-Topic: [MMUSIC] Review of 4566bis
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Date: Tue, 02 Jun 2015 15:24:30 +0000
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Subject: Re: [MMUSIC] Review of 4566bis
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Hi, >>> I do not think that general media level overrides session level value >>> works for the b= attribute Roni >> >> b= is not an attribute :) >> >> Anyway, my suggestion would be that the DEFAULT RULE for all SDP elements that can occur both on >> session and media level should be that the media level overrides the session level. Then, in cases where >> it does not apply, it should be explicitly stated. > > I do think this *would have been* the right thing to do from the beginning. But I am uncertain > if it is the right thing to do *now*, for backward compatibility reasons. > > Before doing so we will need to do an exhaustive study of all current attribute definitions that are registered > in IANA as valid at both session and media level - to ensure that their meaning won't be changed by this. I agree. And, I am not saying we shall apply the media-overrides-session rule to all attributes - I am saying that it needs to be clear to which attributes the rule applies, and to which it doesn't. Leaving it unspecified will not bring compatibility, and the whole purpose of a bis is to correct bugs and clarify things which are unclear :) I would assume that, in most cases, the media-overrides-session rule DOES apply. And, we must make sure that, when new attributes are defined, it is indicated whether the rule applies or not. Regards, Christer >> -----Original Message----- >> From: mmusic [mailto:mmusic-bounces@ietf.org] On Behalf Of Paul >> Kyzivat >> Sent: 31 May, 2015 8:43 PM >> To: mmusic@ietf.org >> Subject: Re: [MMUSIC] Review of 4566bis >> >> On 5/31/15 9:38 AM, Christer Holmberg wrote: >> >> Good list Christer! >> >> I have comments on a few of your issues: >> >>> Q6_2: >>> >>> In some of the sub-sections, it is indicated that a media-level >>> attribute value overrides a session-level attribute value. As far as >>> I know, that applies to all attributes (that can be present both on >>> the session-level and media-level), so there should be a generic >>> statement about that. >>> >>> This is similar to the comment on the c= line. >> >> I used to think this, but I think there are some exceptions. (But I >> don't > offhand >> remember what they are.) >> >>> Section 6.7: >>> >>> --------------- >>> >>> Q6-7_1: >>> >>> The text says: >>> >>> "If any one of these appears in a media section then it applies >>> for >>> >>> that media section. If none appear in a media section then the >>> one >>> >>> from session level, if any, applies to that media section." >>> >>> There should be a general statement in the draft about session level >>> information applying to the media level. >> >> I wish there could be a general statement, but it is hard, given > exceptions. >> Perhaps there could be a general statement with note that it can be > overridden >> in particular cases. >> >> But in any case, *this* is different, because it says that the >> presence of > any >> *one* of four different attributes at media level overrides the >> presence > of any >> one of those four at session level. >> >>> Section 6.11: >>> >>> ----------------- >>> >>> The text says that the attribute "specifies the language" of the >>> session description. >>> >>> There has been some confusion about what that really means, so I >>> think it would be good to clarify that it applies to any textual >>> information that may be provided within the description. >>> >>> It would also be good to explicitly indicate that the attribute is >>> not related to languages used in the actual media streams. >> >> +1 >> >> Thanks, >> Paul >> >> _______________________________________________ >> mmusic mailing list >> mmusic@ietf.org >> https://www.ietf.org/mailman/listinfo/mmusic > > _______________________________________________ > mmusic mailing list > mmusic@ietf.org > https://www.ietf.org/mailman/listinfo/mmusic >
- [MMUSIC] Review of 4566bis Christer Holmberg
- Re: [MMUSIC] Review of 4566bis Paul Kyzivat
- Re: [MMUSIC] Review of 4566bis Roni Even
- Re: [MMUSIC] Review of 4566bis Christer Holmberg
- Re: [MMUSIC] Review of 4566bis Ali C. Begen (abegen)
- Re: [MMUSIC] Review of 4566bis Christer Holmberg
- Re: [MMUSIC] Review of 4566bis Christer Holmberg
- Re: [MMUSIC] Review of 4566bis Paul Kyzivat
- Re: [MMUSIC] Review of 4566bis Christer Holmberg
- Re: [MMUSIC] Review of 4566bis Paul Kyzivat