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multichannel AudioQueue API
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multichannel AudioQueue API


  • Subject: multichannel AudioQueue API
  • From: Matthew Dzieciuch <email@hidden>
  • Date: Fri, 28 Jan 2011 10:31:48 -0800

Hi All,

After very carefully reading all the documentation for the Audio Queue Services API and running the various examples in AudioQueue Tools, I have come to the conclusion that there is undocumented feature (bug). That is to say, the AQ API doesn't appear to support greater than two channel USB audio interfaces.

Has anyone else on this list been able to get greater than two channels of input using the AQ API?

I am certain the device I am using is working correctly. In fact, many programs are able to successfully interface with the device. (an M-Audio Ultra Fast Track). The programs I have tried, are Audacity, GarageBand, and AULab. These programs all use the lower level CoreAudio API though. I would like to program the device myself for a sonar application and the AQ API would have been a much simpler interface to use.

Of course, I would provide many more details if someone was interested. I am hoping that an Apple engineer or someone else can confirm my conclusions. I would be most grateful for any help.

Matt

---------------------------------------------------------------
Dr. Matthew A. Dzieciuch              Telephone: (858) 534-7986
IGPP-0225                             Fax:       (858) 534-6354
Scripps Institution of Oceanography   Email:       email@hidden
University of California, San Diego
La Jolla, CA 92093-0225



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