Subject: [AVT] MWPP-01.txt notes ...

From: John Lazzaro <[email-masked]>
Date: Thu, 21 Feb 2002 12:30:06 -0800

> From: [email-masked]
> Subject: [AVT] I-D ACTION:draft-ietf-avt-mwpp-midi-rtp-01.txt
>
  
http://www.ietf.org/internet-drafts/draft-ietf-avt-mwpp-midi-rtp-01.txt

A quick synopsis of the changes:

  o  The MIDI command section now encodes all legal MIDI
     commands, including all MIDI Systems commands.

  o  The MIDI command section header has new features to
     support the efficient streaming of pre-generated MIDI
     performances.

  o  A new SDP parameter (pwe) indicates that a stream
     is suitable for use in pseudo-wire emulation.

  o  Changes in response to Dominique Fober's AVT postings.

Basically, at this point, for applications where the recovery
journal isn't needed (TCP transport) MWPP is done --
if you see any MIDI functionality which is unencodable in
the MIDI Command Section of MWPP, its a bug we need to fix.

Major remaining work items include:

  o  A redesign of Chapter C of the recovery journal, to 
     handle the semantics of all 128 controllers of the
     MIDI Control Change command. Will probably include
     the creation of a new recovery journal chapter for
     Registered/Non-Registered Parameter Numbers, since
     the Chapter C format is unsuitable for resiliency
     for this feature.

  o  Resiliency guidelines for MIDI Systems. A significant 
     subset is amenable to recovery journal techniques, 
     the rest requires the hooks for an "other means" 
     resiliency, which for unicast could be as simple as
     a separate TCP MWPP link dedicated to the bulk transport
     aspects of MIDI Systems which are unsuitable for UDP
     streaming.

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John Lazzaro -- Research Specialist -- CS Division -- EECS -- UC Berkeley
lazzaro [at] cs [dot] berkeley [dot] edu     www.cs.berkeley.edu/~lazzaro
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