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Problem with Alesis MultiMix 8 USB 2.0 and kAudioDevicePropertyStreamConfiguration
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Problem with Alesis MultiMix 8 USB 2.0 and kAudioDevicePropertyStreamConfiguration


  • Subject: Problem with Alesis MultiMix 8 USB 2.0 and kAudioDevicePropertyStreamConfiguration
  • From: email@hidden (Stefan Haller)
  • Date: Wed, 29 Aug 2007 16:26:14 +0200
  • Organization: Ableton

We are experiencing strange behaviour with the Alesis MultiMix 8
USB 2.0, and I was wondering if there are any known problems with it (or
its driver), or whether we might be doing something wrong.

Here's what happens: we query the input side of the device for
kAudioDevicePropertyStreamConfiguration, it returns one buffer with 10
channels, which is what we expect.  Then we set the sample rate
(kAudioDevicePropertyNominalSampleRate, isInput = true), and after that
we query kAudioDevicePropertyStreamConfiguration again; this time it
returns one buffer with 0 channels (and 0 mDataByteSize).  This strikes
me as a driver bug; I can't quite imagine what we might be doing wrong
here.

Then we start the device, and in the IO proc we get the expected buffer
list (one buffer with 10 channels), which doesn't match what the last
query of kAudioDevicePropertyStreamConfiguration had returned.

Any ideas?


(The version of the Alesis.plugin driver we are using is 1.4.3.)


--
Stefan Haller
Ableton
http://www.ableton.com/
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