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Detecting microphone activity

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Detecting microphone activity

Subject: Detecting microphone activity
From: Michael Ross <email@hidden>
Date: Wed, 26 Apr 2006 20:39:59 -0400

I'm interested in detecting if any process is reading from my iBook's microphone. Using the kAudioDevicePropertyDeviceIsRunningSomewhere property, I can easily tell if the sound card is active or inactive, but this doesn't seem to distinguish between input and output activity.

When using AudioDeviceGetProperty, the results seem insensitive to the isInput parameter, and, similarly, using the AudioObjectGetPropertyData, setting the scope to kAudioDevicePropertyScopeInput appears to have no effect.

My understanding is that this is the "RunningSomewhere" property is the only way for one process to check on other processes' use of audio hardware? Is this correct?

Thanks for any help or suggestions.
----
Michael Ross
email@hidden

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