[Stk] RtWvOut and audio device on linux

[Enrico Costanza]

Hi Steve,

thanks a lot for your reply. 

I tried to set the sample rate to 48000, both using Stk::setSampleRate() 
and using the argument in the RtDuplex constructor, but nothing changed. 
What else could I try?

> Also, when you run mplayer to play a 44100 Hz mp3 or wav file, check 
> the audio path.  
How do I do this?

Thanks,
Enrico

Stephen Sinclair wrote:
> 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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-- 
Enrico Costanza
Assistant-doctorant
Media and Design Laboratory
Ecole Polytechnique Fédérale de Lausanne

http://web.media.mit.edu/~enrico