Subject: Re: [linux-audio-dev] OSC, service discovery ...
From: Steve Harris (S.W.Harris_AT_ecs.soton.ac.uk)
Date: Tue Jan 27 2004 - 02:14:30 EET
While it would be good to be compatible with IETF standards I'm not sure
how applicable they are: OSC doesnt have sessions or streams per se and it
has almost no semantics.
Also it would be a great advantage if service discovery could be done only
using the OSC protocol - for compatability with existing implmentations.
The offer/answer stuff might be relevant, if we can come up with an
equivalent encoding in OSC messages.
- Steve
On Mon, Jan 26, 2004 at 02:58:30 -0800, John Lazzaro wrote:
> Hi everyone,
>
> Just wanted to put in a plug for IETF-based solutions
> to doing service discovery for OSC -- basically, this would
> entail using SIP:
>
> http://www.ietf.org/rfc/rfc3261.txt
>
> for session management, and SDP:
>
> http://www.ietf.org/internet-drafts/draft-ietf-mmusic-sdp-new-15.txt
>
> to describe the sessions themselves. To specify OSC
> in SDP, you'd use UDP or TCP as a transport specifier on
> the media line, and make up (and eventually, register) a "fmt"
> parameter for OSC.
>
> One of the things I'm planning to do now that RTP MIDI
> is finally nearing Last Call is to look at session management
> frameworks for RTP MIDI that would use SIP + SDP. If OSC
> went this route too, applications could use the Offer/Answer
> protocol:
>
> http://www.ietf.org/rfc/rfc3264.txt
>
> to negotiate to use MIDI (for baseline support) or OSC
> (to do more sophisticated things). This was one of the
> motivations behind RTP MIDI -- to offer a migration path
> from MIDI, without requiring backward-compatibility between
> control languages ...
>
> ---
> John Lazzaro
> http://www.cs.berkeley.edu/~lazzaro
> lazzaro [at] cs [dot] berkeley [dot] edu
> ---
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