[Stk] RtWvOut and audio device on linux [fixed]

[Enrico Costanza]

Thanks Gary for your reply. The problem was there also with 2 channels.

I was using the ubuntu packages for the sdk.
The problem disappeared when I compiled the latest version of the 
library from the sources on the ccrma website.

I already filed a bug for the libstk0-dev package.

Best,
Enrico

Gary Scavone wrote:
> Hi Enrico,
>
> It appears that it found a device but that it does not support only 1 
> channel.  That is weird, because RtAudio is supposed to automatically 
> compensate for devices that have a minimum number of channels greater 
> than that requested by the user.  In any event, you may try changing 
> the number of channels parameter to RtWvOut to 2 or more.
>
> You can also download the RtAudio distribution, compile the "info" 
> program in the "tests" directory and see what it reports for your system.
>
> Regards,
>
> --gary
>
> On 30-Jun-07, at 1:36 PM, Enrico Costanza wrote:
>
>> 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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>>>
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>>
>>
>> --Enrico Costanza
>> Assistant-doctorant
>> Media and Design Laboratory
>> Ecole Polytechnique Fédérale de Lausanne
>>
>> http://web.media.mit.edu/~enrico
>>
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