[Stk] RtWvOut and audio device on linux

[Stephen Sinclair]

Hi Enrico,

I don't know if this is the problem, but sometimes I have had trouble 
with ALSA if I haven't set my sample rate to 48000.   I don't know why 
exactly, but it doesn't seem to handle the wrong sample rate.  Probably 
because ALSA is a hardware driver and isn't supposed to provide software 
resampling.  Anyways, give it a try.

Also, when you run mplayer to play a 44100 Hz mp3 or wav file, check the 
audio path.  I often notice that it sticks a 44100->48000 resampling 
section in the audio pipeline, so this is probably the reason.  It would 
of course be nice to handle this a little smoother, maybe by throwing an 
exception.

Steve


Enrico Costanza wrote:
> Dear All,
>
> I am trying to use the stk on kubuntu 7.04, and I am experiencing 
> problems with the real-time classes.
> Here is a simple test program trying to allocate RtWvOut with the 
> default parameters, and its output.
>
> ---
> #include <RtWvOut.h>
>
> using std::cout;
> using std::endl;
>
> int main(){
>    RtWvOut * test = NULL;
>    cout << "about to alloc" << endl;
>    test = new RtWvOut(  );
>    cout << "allocated" << endl;
>    delete test;
>    cout << "de-allocated" << endl;
>      return 0;
> }
> ---
> This is what I get:
> ---
> about to alloc
>
> RtApi: no devices found for given stream parameters:
>    RtApiAlsa: channels (1) not supported by device (hw:I82801CAICH3,0).
>    RtApiAlsa: pcm device (hw:I82801CAICH3,1) won't open: No such file 
> or directory.
>    RtApiAlsa: pcm device (hw:U0x4710x329,0) won't open: No such file 
> or directory.
>
>
> terminate called after throwing an instance of 'StkError'
> Aborted (core dumped)
> ---
>
> At the same time, audio seems to work fine on my machine.  For example 
> I can play wave files with aplay.
> Am I doing something obviously stupid?
>
> Any suggestions and pointers are welcome.
>
> Thank you in advance.
>
> Enrico
>
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