There are a few different ways to do it, but the simplest is to use
the property kAudioDevicePropertyStreamConfiguration. This property
returns an AudioBufferList that is populated like what you'd see in
your IOProc. You can iterate through the AudioBuffers and sum the
mNumberChannels fields to get the total number of channels.
There is code for doing this in the CAAudioHardwareDevice class in
the PublicUtility section of our SDK. Also, you can see an example of
it's usage in the HALLab app which is also in our SDK.
On Jun 15, 2006, at 12:15 PM, Christoph Teschner wrote:
I populate a list of audio output devices currently attached to the
computer.
I would like to display the number of channels each device support.
How can I retrieve that information when I have the audio device ID
of the device ?
--
Jeff Moore
Core Audio
Apple
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