[AVT] updated MIDI packetization I-D submitted
John Lazzaro <lazzaro@CS.Berkeley.EDU> Tue, 02 October 2001 19:27 UTC
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Date: Tue, 02 Oct 2001 12:26:19 -0700
From: John Lazzaro <lazzaro@CS.Berkeley.EDU>
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Subject: [AVT] updated MIDI packetization I-D submitted
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Hi everyone, We've finished rewriting: --- MWPP: A resilient MIDI RTP packetization for network musical performance <draft-lazzaro-avt-mwpp-midi-nmp-00.txt> Abstract This memo describes the MIDI Wire Protocol Packetization (MWPP). MWPP is a resilient RTP packetization for the MIDI wire protocol; it is specialized for low-latency applications such as network musical performance. MWPP defines a multicast-compatible recovery system for gracefully handling lost and late packets during the performance. In a network musical performance system, incoming MWPP streams control audio synthesis software running on each network host. This software might use the MPEG 4 Structured Audio standard as a normative framework for audio synthesis. To support MPEG 4 Structured Audio in an interoperable fashion, this memo describes how to transport MWPP via the generic MPEG 4 RTP packetization. --- and sent it off to internet-drafts@ietf.org, hopefully an announcement will happen in the next few days. Until the official announcement, you can pick up the new I-D using this URL: http://www.cs.berkeley.edu/~lazzaro/files/ietf/draft-lazzaro-avt-mwpp-midi-nmp-00.txt Note the I-D number is still -00 because the I-D name needed to be changed. The memo has changed in several major ways, in response to WG feedback: [1] MWPP is now, explicitly, a MIDI RTP packetization for low-latency applications such as network musical performance; it is no longer defined to be an MPEG packetization. The change reflects the goal of supporting all low-latency MIDI softsynth applications, not just MPEG 4 Structured Audio applications. [2] The relationship between the memo and MPEG 4 is two-fold: -- The memo normatively includes the MPEG 4 Structured Audio document, because MWPP borrows the semantics of MIDI control of a software synthesizer from the document. Since these semantics are sound, and are simple to apply to other, non-MPEG-4 software applications, it is easier to include these semantics normatively from an MPEG document, than to regurgitate them in an IETF document. -- Because the memo normatively includes the MPEG 4 Structured Audio document, the recovery semantics of MWPP are a good match for Structured Audio systems. However, for maximum interoperability, these Structured Audio applications should use "RFC-generic", not the RTP packetization MWPP uses. To solve this problem, we've added two sections to the I-D: Section 9, which describes how to use MWPP with RFC-generic, and Section 12, which describes the SDP to configure RFC-generic for use with MWPP. These sections draw heavily from the recent draft-ietf-avt-mpeg4-simple-00.txt I-D. WG members who read the earlier I-D only need to read the abstract, Section 1 (Introduction), and Sections 9 and 12 ("RFC-generic"), the other sections and appendices of the I-D are virtually unchanged from the earlier version. The plan from our end is to monitor the WG response, to see if the issues from the first draft are satisfied; once that wave passes, we plan to post pointers to the I-D to a few mailing lists where mainstream MIDI applications folks hang out, and encourage them to read the I-D, and join the AVT mailing list if they want to discuss MWPP open issues. This seems to be a way to solicit feedback from related communities, in a way that makes the WG aware of the open issues ... ------------------------------------------------------------------------- John Lazzaro -- Research Specialist -- CS Division -- EECS -- UC Berkeley lazzaro [at] cs [dot] berkeley [dot] edu www.cs.berkeley.edu/~lazzaro ------------------------------------------------------------------------- _______________________________________________ Audio/Video Transport Working Group avt@ietf.org http://www1.ietf.org/mailman/listinfo/avt
- [AVT] updated MIDI packetization I-D submitted John Lazzaro