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Help with monitoring system-wide audio
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Help with monitoring system-wide audio


  • Subject: Help with monitoring system-wide audio
  • From: Bob Smith <email@hidden>
  • Date: Mon, 26 Nov 2007 14:22:45 -0800


I'm trying to create a Cocoa application which can monitor audio output level system-wide. I just need to display a basic audio level meter, but it has to respond to anything being sent to the default audio device from any application. The monitoring application itself won't be generating or processing audio, just displaying the level. Is there any way to query the audio system to get the necessary information? I've been studying documentation and searching list archives, but I'm not finding anything that seems relevant, or maybe I'm just not "getting it". I'm a newbie as far as the audio APIs go, I've done a fair amount of Cocoa development but this is my first attempt at anything audio-related (beyond just telling NSSound or QuickTime to play an audio file).


Any suggestions, pointers to relevant docs, etc., greatly appreciated!

Bob Smith
Three House MultiMedia, Inc.

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