[Stk] RtAudioFormat and static at output

[Gary Scavone]

Hi David,

Did you run the "configure" script before compiling STK?  It sounds  
like the endian flag was not set.  I don't know the endianness of a  
Pico-ITX board but the default STK configuration is big-endian.  If  
you are using a little-endian system, provide the __LITTLE_ENDIAN__  
preprocessor flag to the compiler.

Regards,

--gary

On 26-Mar-08, at 9:03 AM, David Michael wrote:

> Hello
>
> I wonder if someone can help me out.
>
> I have an STK/RtAudio based application running under Ubuntu Server  
> 7.1(ALSA) on a Pico-ITX board, and thus the VIA VT82xx chip.
>
> The only problem is that the audio sounds like static (and only on  
> one channel, the other is silent) even though the app does not  
> complain at compilation nor at runtime. What makes this especially  
> odd is that using "aplay" to play a soundfile does not suffer from  
> this problem. It plays fine like so.
>
> $ aplay public/soundfiles/chimes.wav
> Playing WAVE 'public/soundfiles/chimes.wav' : Signed 16 bit Little  
> Endian, Rate 44100 Hz, Stereo
>
> Additionally, I can connect a USB soundcard, and everything works  
> swimmingly - I suppose this is to be expected.
>
> What am I doing wrong??
> Is the RtAudioFormat incorrect?
>
> I am using the following to determine format:
> RtAudioFormat format = ( sizeof(StkFloat) == 8 ) ?  
> RTAUDIO_FLOAT64 : RTAUDIO_FLOAT32;
>
> Does this have to do with duplex channels input and output channels  
> registering for the soundcard?
>
> Any help would be much appreciated
> Best
> David
>
> PS - it is still possible that the problem has to do with the ALSA  
> driver, but since I am able to use aplay successfully, I thought  
> maybe no...
>
>
> Here is the dump of the probe.cpp application - the soundcards as  
> RtAudio sees them:
>
> Device Name = hw:HDA VIA VT82xx,0
> Probe Status = Successful
> Output Channels = 2
> Input Channels = 2
> Duplex Channels = 2
> This is the default output device.
> This is the default input device.
> Natively supported data formats:
>   16-bit int
>   32-bit int
> Supported sample rates = 44100 48000 88200 96000 176400 192000
>
> Device Name = hw:HDA VIA VT82xx,1
> Probe Status = Successful
> Output Channels = 2
> Input Channels = 2
> Duplex Channels = 2
> This is NOT the default output device.
> This is NOT the default input device.
> Natively supported data formats:
>   16-bit int
>   32-bit int
> Supported sample rates = 44100 48000 88200 96000 176400 192000
>
>
>
>
> Here is the attached USB Audio Device dump that works:
>
> Device Name = hw:USB Audio Device,0
> Probe Status = Successful
> Output Channels = 2
> Input Channels = 0
> Duplex Channels = 0
> This is NOT the default output device.
> This is NOT the default input device.
> Natively supported data formats:
>   16-bit int
> Supported sample rates = 48000
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