These methods are only for k-rate signals. I am not
sure whether it is a good idea to deal with audio
signals in Java, probably very slow, usable only
for very simple things.

Victor

>
> I have a student who is attempting to use the Java API
> acess to Csound, and in particular using the Software Bus
> to get data in and out.  I am not up to speed on the API,
> and know no Java, but what he sems to be saying is that he
> annot get a-rate data out via the GetChannel and
> SetChannel methods.  i woud appreciate hearing what he is
> doing wrong
>
> ------- Start of forwarded message -------
> Date: Wed, 12 Jul 2006 15:27:41 +0100
> Subject: Csound Java API - difficulties with a-rate data
>
> I've been working with the Java API wuth some success, but
> run into a fairly fundamental problem with accessing
> a-rate data.
>
> k- and i- rate data are fine, using the chnset and chnget
> opcodes and named (i.e . string indexed) channels. These
> can be accessed through the API with the GetChannel and
> SetChannel methods of the main Csound class.
>
> a-rate data must obviously work differently, since the
> (Get|Set)Channel methods have a single return (whereas we
> need ksmps returns). In any case, using something like:
>
> chnset a1, "output"
>
> (where a1 is a-rate data which also goes to "out")
>
> doesn't result in anything being passed to the named
> channel "output".
>
> Annoyingly, I can see exactly how this works in the C API,
> and the Java API does have methods for GetOutputBuffer and
> GetSpout, both of which return an opaque type
> SWIG_p_double, which I assume is a pointer to the first
> MYFLT (of ksmpls MYFLTs) in the output buffer.
> Unfortunately, I can't see a way to access it. Obviously
> in Java there's no way to just dereference the pointer.
>
> The only other sensible looking approach is to use the
> chano opcode. There are Java methods (e.g. ChanOAGet)
> which take a SWIG_p_double (presumably a pointer to the
> channel created with chano) and an integer (I presume an
> index, as in the C function csoundChanOAGet). However, in
> Java, all I have to work with is the function return (in
> this case an integer, which seems to just be zero for a
> successful call).
>
> ------- End of forwarded message -------
>
> ==John ffitch
>
>
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