Re: [MMUSIC] Streaming media

[Gonzalo Camarillo <[e-mail]>]

Flemming,

thanks for the pointer. That was the draft I was looking for.

I could use that framework to indicate streaming media, although for
that application, an attribute per media stream, rather than per payload
type would seem more appropriate.

Thanks,

Gonzalo

Flemming Andreasen wrote:
> 
> Gonzalo Camarillo wrote:
> 
> > Hi,
> >
> > I kind of remember that some time ago there was a proposal about an SDP
> > attribute to indicate that the receiver could use long buffers to
> > receive the media. I believe it dealt with tones, mainly.
> >
> 
> Right (sort of). The basic discussion was support of fax and modem calls
> and we've had a couple of different drafts on this topic (starting in
> London 2001), with the latest one being
> <draft-rajeshkumar-mmusic-gpmd-01.txt>. The approach taken has been to
> associate optional attributes with a particular payload type in order to
> indicate certain characeteristics about the media that the receiver may
> benefit from knowing. For example, the gpmd draft defines a "voice band
> data" attribute to indicate that the media is voice-band data. However, we
> would not try and specify implementation specific ways of dealing with
> "voice-band data" such as use of long buffers or other.
> 
> >
> > I was thinking that if we establish a session using SIP that will carry
> > streaming media, we may want to tell the other end that it can buffer
> > this stream.
> >
> 
> I believe the gpmd framework could be used for this, but in a slightly
> different way. Rather than specifying that "media can be buffered" we would
> have a more generic attribute that defines the media as "streaming" and
> hence the receiver can apply whatever special processing it may desire for
> streaming media, e.g. buffering it.
> 
> >
> > What is the status of that work? was there any interest in the group?
> >
> 
> There has been some interest expressed (mostly by modem folks) and the work
> is being performed in the MMUSIC WG, although as an individual submission.
> There are a few issues with the current gpmd draft and we will be issuing a
> new version. Assuming it does not generate any major comments, we will then
> be asking for a WG last call on it.
> 
> -- Flemming
> 
> >
> > Thanks,
> >
> > Gonzalo
> > _______________________________________________
> > mmusic mailing list
> > [e-mail]
> > https://www1.ietf.org/mailman/listinfo/mmusic

-- 
Gonzalo Camarillo         Phone :  [phone]
Oy L M Ericsson Ab        Mobile:  [phone]
Telecom R&D               Fax   :  [phone]
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