It is definitely the case that there are devices out there (including
USB headsets) that have no volume controls.
Checking for kAudioHardwareUnknownPropertyError getting returned from
AudioDeviceGetPropertyInfo() or calling AudioObjectHasProperty() are
fine ways to find out if the device supports a volume control on a
given channel.
On Mar 28, 2007, at 4:05 PM, Neal Sidhwaney wrote:
With two different USB microphones we’ve tried, we’re getting ‘who?’
when setting kAudioDevicePropertyVolumeScalar with the following
lines of code:
My question is, do USB headsets generally not support setting an
input level through Core Audio? Is it a hardware deficiency or a
driver problem? Is checking for ‘who?’ in this case the best way to
determine if this functionality is present?
--
Jeff Moore
Core Audio
Apple
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