Subject: [linux-audio-dev] latest MWPP document released ...
From: John Lazzaro (lazzaro_AT_CS.Berkeley.EDU)
Date: Sat Jun 29 2002 - 05:12:32 EEST
Hi lad-folk,
For those of you interested in the MIDI Wire Packetization
Protocol, the AVT WG posting announcing the latest memo release is
below. A goal in this release was to create a memo readable by both
MIDI experts and IETF standards experts, there is tutorial IETF
background information woven into each section ...
--jl
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[as posted to avt_AT_ietf.org]
Hi everyone,
draft-ietf-avt-mwpp-midi-rtp-04.txt is ready for download:
http://www.cs.berkeley.edu/~lazzaro/sa/pubs/txt/current-mwpp.txt
A long Change Log starts -04.txt, a few highlights:
[1] We've had good success getting input from MIDI experts on
the "bits-on-the-wire" issues of MWPP's RTP packetization.
The packetization format is stabilizing, as the small
number of packetization-related changes in -04.txt shows.
At this point, the document needs the same sort of MIDI
expert opinion on the SDP side of MWPP. However, 03.txt's SDP
text is not welcoming to an SDP newcomer. So much IETF context is
needed: SDP/SIP/SIP-offer-answer/SIP-NAT-hacks/RTSP all link to
RTP in subtle ways.
So, the big focus on -04.txt is editorial in nature, a rewrite
to de-mystify SDP and its protocol neighborhood. In -04.txt:
o A new intro that describes RTP's connection to SDP & friends.
o The SDP parameter definitions now live in Appendices C.1-5.
o Only one SDP section in the main text (Section 6), that
explains how to set up "minimal" stream descriptions,
and introduces SDP Appendices as enhancements to the minimal.
[2] Significant redesign and enhancement of SDP features, including:
o An extensible way to specify the method of rendering MIDI
to audio.
o Via the new config="" mpeg4-generic feature, -04.txt supports
a flexible transport method for AudioSpecificConfig() data.
o Rationalization of mwpp and mpeg4-generic MWPP modes -- the
rtpmap line structure is now identical, and the two media
types share most SDP parameters.
o General support for multiple MWPP streams, w/ sync features.
I won't be making the trip to Japan, but hope to prepare a few slides
to update the MWPP plan going forward for the AVT session.
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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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