[Stk] Multichannel I/O

[Gary Scavone]

Hi Gautham,

The realtime audio i/o in STK is handled by a class called RtAudio.  
You can get more specific information about that at:

  http://www-ccrma.stanford.edu/~gary/rtaudio/

The limit to the number of input/output channels depends primarily on
your soundcard.  Also, if you're using a DirectSound audio driver
under Windows, you're limited to two channels per stream (though you
could have multiple two-channel streams running at the same time).  
Using an ASIO driver, you should be able to use all channels and get
good input/output latency.  I myself have an RME Hammerfall DSP system
and I verified that it worked with the ASIO driver and RtAudio.  With
STK, you would need to make sure you change the preprocessor
definition in the Visual C++ projects from __WINDOWS_DS__ to
__WINDOWS_ASIO__.

--gary

On Thu, 6 Feb 2003, Gautham Mysore wrote:

>>Hi,
>>
>>I recently downloaded STK and I read that the current version supports 
>>multichannel real time input and output. Is there any limit on the number of 
>>channels of realtime input and output? If so, how many channels is this 
>>limit?
>>I am planning on getting the RME HDSP 9652 soundcard which supports upto 26 
>>channels of input and output. I would like to able to use almost all of 
>>these channels for certain applications.
>>My OS is Windows 2000. If I write applications using the STK for realtime 
>>multichannel input and output, using ASIO drivers, would I be able to get 
>>low latencies (less than 20 ms)?
>>
>>Thanks,
>>Gautham