Re: [sc-dev] SynthDesc from SynthDef.asBytes. converting byte arrays to int16 and floats

[Scott Wilson <sdwilson@xxxxxxxxxxxx>]

Did you ever get this working? It would be very useful for something 
I'm working on now. Some of the methods below have been implemented, 
but there's still no Float-from32bits or -from64bits. I had a go at it, 
hacking together a few things, but eventually ran up against this.

Alternatively, is there an easy way to determine the number of output 
channels from a SynthDef without storing it?

S.

On 20 Aug 2004, at 00:19, Ioannis Zannos wrote:

> Thanks, that is actually what I was asking for.
> Except for the getFloat.  At this point, I'd need to
> code this in SC (rather than in C++). What is the algorithm
> for this?
>
> IZ
>
> -------------------
>
> On Fri, 6 Aug 2004, James McCartney wrote:
>
> > This is not the best approach. You should implement the methods in
> > CollStream like this.
> >
> > 	getChar { ^this.next; }
> > 	getInt8 { ^this.next & 255; }
> > 	getInt16 { ^this.getInt8 << 8 | this.getInt8; }
> > 	getInt32 { ^this.getInt16 << 16 | this.getInt16; }
> > 	getFloat { ^Float.from32bits(this.getInt32); }
> > 	getDouble { ^Float.from64bits(this.getInt32, this.getInt32); }
> > 	getPascalString {
> > 		var size, string;
> > 		size = this.getInt8;
> > 		string = String.newClear(size);
> > 		size.do {|i| string[i] = this.getChar };
> > 		^string
> > 	}
> >
> > unfortunately there is nothing like Float.from32bits or
> > Float.from64bits. There should be primitives for that.
> >
> >
> > On Aug 6, 2004, at 3:47 PM, Ioannis Zannos wrote:
> >
> > > Hello,
> > > I am trying to add a method SynthDesc-fromSynthDefBytes, so as to
> > > be able to create a SynthDesc directly from SynthDef without having
> > > to load it from its data on Unix file.  This would be very
> > > useful for creating synthdescs and accompanying GUIs for playing
> > > functions on-the-fly.   Could someone help me convert from the
> > > byte-array format of compiled SynthDefs to SynthDesc by providing
> > > a description of the Integer16 and Float formats used in SynthDef
> > > files?
> > >
> > > Below is the framework of the class I am writing that will make the
> > > conversion.
> > >
> > > Thanks.
> >
> > _______________________________________________
> > sc-dev mailing list
> > sc-dev@xxxxxxxxxxxxxxx
> > http://www.create.ucsb.edu/mailman/listinfo/sc-dev
>
> --
> Iannis Zannos
> Research Director
> Center for Research in Electronic Art Technology
> Music Department / MAT,
> University of California, Santa Barbara,
> Santa Barbara, California 93106
>
> Tel: (805) 893-8352
> Fax: (805) 893-7194
>
> http://www.create.ucsb.edu/~iani/
>
>
>
>
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