[PD] MIDI and opensoundcontrol: type m for OSC ?

[Winfried Ritsch]

Hello,


On Monday 11 July 2016 12:10:21 Martin Peach wrote:
> On Mon, Jul 11, 2016 at 9:32 AM, Winfried Ritsch <ritsch at iem.at> wrote:
> > Hello,
> > 
> > 1) Had anyone experience with or used the tag type "m" for transmitting
> > MIDI
> > over OSC ?
> > 
> > from http://opensoundcontrol.org/spec-1_0 :
> > 
> > " m 4 byte MIDI message. Bytes from MSB to LSB are: port id, status byte,
> > data1, data2"
> > 
> > 2) Is there a defined protocol for MIDI over OSC ?
> > 
> > 3) How to implement this in Pd ?
> > 
> >  since there are no 'm' typetags defined for [oscformat] and [packOSC]
> > 
> > I can add 'm' to [packOSC] and [unpackOSC], it's not too  difficult...
> 
> How would a MIDI message be specified? I can add a selector like [sendmidi
> /some/path 1 2 3 4( where 1 2 3 4 are the four bytes. Would the MIDI
> channel be in the portID or the status byte as usual? [unpackOSC] would
> emit the path and a (multiple of 4)-byte list.
> The [sendmidi( message would accept any amount of MIDI quads. MIDI sysex
> messages would be better sent as blobs.
> Single-byte MIDI messages would still need to be sent as four bytes.
> 
Thanks for the offer, this seems a proper way to implement this.

But first I want to evaluate if it is really needed. if  there is the 
opportunity, people will use it and complicate things in future ;-).

> > I ask, because someone want to send MIDI over OSC to my Robot-Pianoplayer
> > driven by Pd and I do not know if this is used by other software this way,
> > if
> > it is "worth" to implement.
> > 
> > It's a bit more efficient than sending four integers. In Pd you can't make
> 
> every possible 32-bit integer from four bytes since it has to be converted
> to a 32-bit float first, so the simple method of packing a MIDI message
> into one integer won't work.
> 
native MIDI is 3bytes=24Bit  (except SYSEX) so it could work.
(to be exact since data bytes are 7 bits and status also with bit 8 set, a 
MIDI message  is 21Bit long)

mfG
 Winfried

-- 
--
- ao.Univ.Prof. DI Winfried Ritsch 
- ritsch at iem.at - http://iem.at/ritsch
- Institut fuer Elektronische Musik und Akustik
- University of Music and Dramatic Art Graz
- Tel. ++43-316-389-3510 (3170) Fax ++43-316-389-3171 
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