[gmpi] Re: 3.15 MIDI
- From: "Jeff McClintock" <jeffmcc@xxxxxxxxxx>
- To: <gmpi@xxxxxxxxxxxxx>
- Date: Thu, 17 Jun 2004 11:06:42 +1200
OK, That's an interesting point.
If you convert MIDI to GMPI then back to MIDI, the converter may use
running status when the original stream did not (or vica versa). Therefore
is is not exactly the original byte stream.
Hmm...
Both streams represent the same performance, both will 'render' the same
music.
Is that a genuine problem, I don't know....
Jeff
----- Original Message -----
From: "Chris Grigg" <gmpi-public@xxxxxxxxxxxxxx>
To: <gmpi@xxxxxxxxxxxxx>
Sent: Thursday, June 17, 2004 10:41 AM
Subject: [gmpi] Re: 3.15 MIDI
> 1. OK, in this model how would the following be handled?:
>
> - Sys ex
> - MIDI out from plugs
> - GMPI/MIDI transcoding side effects including:
> > Message execution time shifts
> > Running Status handling
> > (N)RPN parameter number tracking
>
> 2. On that last category,the more I think about it, the more it seems
> impossible, or at least it that it would be somewhat to very
> complicated, to have one GMPI message per MIDI message without losing
> MIDI stream byte-exactness.
>
> Consider running status, for example in the context of an ordinary
> 7-bit controller message. MIDI device sends a full 2-byte
> status+data message, waits a minute, then sends another controller
> message but this time it's a 1-byte message, relying on running
> status to imply/repeat/insert the previous status byte. The host
> turns the first MIDI msg into a GMPI set-parameter message, the plug
> converts it back to MIDI, and sees a 2-byte msg; so far, so good.
> Then the plug gets a second GMPI message corresponding to the 2nd
> MIDI message, converts it back to MIDI... but now you've got another
> 2-byte message instead of a 1-byte message. MIDI received at the
> plug not exact with MIDI received at the host.
>
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