[OSC_dev] OSC Query Systems & Binary Protocol

[Christopher Graham]

Hi Steve,

Sounds good I'll review your paper and look for you at NIME.  I'll be there
as a vendor and will have a booth, although I don't quite have anything to
sell yet, just a prototype.

I may be at ICMC this year, so I may see you there also.

Sorry, everyone, if multiple copies my post appeared on the list.  It kept
sending me a bounce message.

- Chris

> -----Original Message-----
> From: osc_dev-bounces at create.ucsb.edu 
> [mailto:osc_dev-bounces at create.ucsb.edu] On Behalf Of Stephen Sinclair
> Sent: June 2, 2007 5:00 PM
> To: Developer's list for the OpenSound Control (OSC) Protocol
> Subject: Re: [OSC_dev] OSC Query Systems & Binary Protocol
> 
> Hi Chris,
> 
> > Therefore I need a query interface, and preferably I would use one 
> > that is compatible with what others are doing.
> 
> You might be interested in some work we've been doing at 
> McGill.  We are tackling this exact issue with controllers 
> built in our lab.  So far we've put together a mapping system 
> that allows querying of namespace and then making arbitrary 
> connections with scaling operators between the controller and 
> a compatible synthesis engine.  The work we've done so far 
> has been in Max/MSP.  We've written a paper on the subject 
> which has been submitted (but not yet accepted) to ICMC.  You 
> might like to look at it, so I've put it up on my webspace:
> 
> http://www.music.mcgill.ca/~sinclair/pub/papers/Malloch_mappin
> g2007.pdf
> 
> When we wrote this in fact I was not aware of liboscqs, so 
> thank you for bringing it to my attention!  Same as you, we 
> of course do _not_ want to duplicate work.  Our paper merely 
> presents what query protocol we were using en lieu of 
> something more standard being available.  We are definitely 
> open to suggestions, but you might find some ideas in there 
> nonetheless.
> 
> > I will be at NIME next week, so if anyone is interested in 
> discussing 
> > these things, please let me know.
> 
> I will as well, as will Joe Malloch, the primary author of 
> the above... we'll be sure to talk! :)
> 
> 
> Steve
> 
> 
> On 6/2/07, Chris Graham <chrisgr at shaw.ca> wrote:
> > I'm developing a family of modular electronic wind instruments that 
> > will use OSC as their external interface to other 
> applications.  You 
> > can see more details at www.multiwind.com.
> >
> > The plan is that the instruments are mainly rich sources of 
> control data.
> > Higher level interpretation of the control gestures into 
> music control 
> > signals (in OSC or MIDI) is done on a host computer.  The 
> hardware is 
> > modular and highly configurable and it is desirable that the host 
> > computer software be able to query what modules are 
> present, i.e. what 
> > the overall namespace of the instrument currenly is.  It 
> will also be 
> > desirable for host computer sofware to be able to configure the 
> > instrument using OSC commands regarding what sensors to sample, 
> > sampling rate, prescaling, hysteresis to apply, etc., and 
> where to send the data.
> >
> > Therefore I need a query interface, and preferably I would use one 
> > that is compatible with what others are doing.
> >
> > The closest proposal I have seen to what I need is the one 
> by Martin 
> > Habets which is available at 
> http://liboscqs.sourceforge.net/ . This 
> > describes a way to inquire of an OSC client the details of its 
> > namespace, and to ask it to send specific data items to 
> specific data 
> > consumers.  I would add to the the ability to set the sampling rate 
> > for a given sensor, transformations to apply, etc.
> >
> > I see from the list archives that there was some controversy about 
> > whether this, or any dynamic patching systems was desirable, but I 
> > definitely need something like this and I expect that 
> others do also.
> >
> > Martin, if you see this post, could you explain more 
> details about the 
> > "category" field is in your patching system?  It's not 
> clear to me how 
> > this, an integer, specifies what item in the namespace is 
> supposed to 
> > be sent to the requested destination.
> >
> > More generally, what is the current state of the art in 
> query systems 
> > and patching?  I saw in another post that the Lemur group was 
> > developing a query system.  What is this?  Any others?
> >
> > I'm also developing a compact binary version semantically 
> equivalent 
> > to the essential elements of OSC, but suitable for lower 
> bandwidth connections.
> > For example the expansion bus in my instruments uses the 
> SPI protocol 
> > with a maximum shared rate of about 1Mbps.  Also, my 
> devices use USB 
> > with a USB 1.1 equivalent data rate to link to the host, 
> and I want to 
> > be efficient of bandwidth on that link.  My binary protocol 
> which will 
> > arrive at the host on USB HID (for tighter timing than USB 
> bulk) will 
> > be translated into normal OSC by my USB driver, so it will not 
> > necessarily be seen to the outside world, but my lower 
> level solutions 
> > may be of interest to others.  I will open source the host 
> software for this project so others can use it.
> >
> >
> > - Chris Graham
> >
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> >
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