Re: [MMUSIC] DECISION: Default mechanism to map RTP data to m- line is based on PT?

[Harald Alvestrand <[e-mail]>]

I am on vacation now, so short answer:

Apps that use m-lines for rtp session negotiation and not for stream control need no such association.

If we mandate such association, we load those apps with extra luggage.


Christer Holmberg <[e-mail]> wrote:

>Hi Harald,
>
>Just for my clarification: Assuming we are talking about applications
>using RTP (instead of ANY BUNDLE application), is your answer to Q3
>still "no"?
>
>In other words, do you think there might be RTP cases where it is not
>needed to associate the RTP data with an m- line?
>
>OR, do you think that BUNDLE simply shouldn't say anything about how to
>map RTP packets to m- lines?
>
>Regards,
>
>Christer
>
>
>From: [e-mail] [mailto:[e-mail]] On
>Behalf Of Harald Alvestrand
>Sent: 26. kesäkuuta 2013 8:25
>To: [e-mail]
>Subject: Re: [MMUSIC] DECISION: Default mechanism to map RTP data to m-
>line is based on PT?
>
>On 06/25/2013 01:34 PM, Christer Holmberg wrote:
>Hi,
>
>Emil suggested that the default, "MTI", mechanism for mapping RTP data
>to m- lines should be based on PT. Applications are allowed to use
>whatever other mechanisms, but usage of such mechanisms must be
>negotiated (or, applications need to have some other means knowing that
>the other endpoint support such mechanisms).
>
>Q3: Do we need to specify a default, MTI, mechanism for mapping RTP
>data to m- lines?
>
>No. This makes the assumption that all applications have the need to
>map RTP data to m-lines; this assumption is not proven (and probably
>cannot be - it's hard to prove a negative. It might be possible to
>disprove it, though).
>
>
>
>Q4: If Q3, do we mandate applications to support, and use (unless
>applications are made aware of other mechanisms supported by all
>endpoints) PT for mapping received RTP media?
>
>If the WG disagrees with me on Q3, it might as well go down this path.
>I have no strong opinion.
>
>
>
>This means that, when mapping RTP to m- lines is required (whether it
>is always mandated is discussed in another thread), within a BUNDLE
>group each PT value must be unique to an individual m- line.
>
>NOTE: If your answer to Q3 is "yes", but your answer to Q4 is "no",
>please indicate which mechanism you prefer :)
>
>Regards,
>
>Christer
>
>
>
>
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Sent from my Android phone with K-9 Mail. Please excuse my brevity.