[Impromptu] impromptu v2.0 released

[Michele Pasin]

Hi all,

did anybody have any strange impromptu behavior after the latest OSX  
update?

[http://www.flickr.com/photos/mikele/3907046949/sizes/l/]

Basically, as soon as I launch the movie-capture function (see the  
screenshot) I start getting a never ending list of 'audio dropout'  
errors... as a result I have to stop the screencapture function and  
can't do any screen-casting anymore.
I think it's caused by an OS update for I am actually using Impromptu  
1.3 on that machine (an iMac, Intel Core Duo), and  the error started  
appearing only recently. I also tried using 1.5 and 2.0 ... same  
'audio dropout' problem.

what could it be?

Curiously instead, on my macBookPro laptop (same OS, Intel Core 2 Duo)  
everything seems to work fine....

thanks,

Michele



On 7 Sep 2009, at 09:13, Andrew Sorensen wrote:

> Impromptu version 2.0 is now available for download at:
> http://impromptu.moso.com.au/downloads.html
>
> Impromptu v2.0 is a major release with three significant architectural
> changes.
>
> 1) A new impromptu x86 compiler
> 2) Audio signal processing directly in Impromptu.
> 3) A new concurrent garbage collector
>
> The new impromptu x86 compiler uses LLVM for backend code generation
> and supports runtime compilation of scheme functions to x86 machine
> code.  In particular the compiler has been added to impromptu to
> support the efficient compilation of scheme code for data processing
> tasks such as image processing, audio signal processing and OpenGL.
> The compiler is exposed at runtime through the sys:compile call which
> accepts a scheme closure and returns a foreign function which may be
> called freely from scheme.  (help sys:compile #t) will give you a
> bunch of examples.
>
> On-the-fly audio DSP programming is now supported directly within the
> impromptu scheme environment by allowing x86 code (i.e. compiled
> scheme code) to be hot-swapped into the kernel of a custom code
> AudioUnit.  You may use one or more of these custom code audiounits
> anywhere in your audiounit chain - as both generators and or effects.
> Code is hot-swapped into an AU kernel by passing a given scheme
> closure to the au:code:load function.  There is also a mechanism for
> sharing memory between the AU and the scheme runtime. (help
> au:code:load #t) will give you a bunch of examples.
>
> The primary motivation for the new GC is to provide greater
> performance with larger heap sizes.
>
> v2.0 also adds support for Snow Leopard but is no longer provided as a
> Universal Binary.  Intel only from v2.0 forward.
>
> A brief screen-cast demonstrating the new on-the-fly audio
> functionality can be found at: http://www.vimeo.com/6096554
>
> Cheers,
> Andrew.
> _______________________________________________
> Impromptu mailing list
> Impromptu at lists.moso.com.au
> http://lists.moso.com.au/mailman/listinfo/impromptu









____________________________
Dr. Michele Pasin, Researcher
Centre for Computing in the Humanities
King's College, London
http://staff.cch.kcl.ac.uk/~mpasin/