Re: Help with monitoring system-wide audio
Re: Help with monitoring system-wide audio
- Subject: Re: Help with monitoring system-wide audio
- From: Jeff Moore <email@hidden>
- Date: Mon, 26 Nov 2007 14:34:52 -0800
No, there isn't any service or API that does what you want. That is
not to say it is impossible. There are ways to do it that have various
pros and cons. In general, the main way others have attempted this
task is to use the various audio driver APIs to create a fake device
that can funnel the data to your application for metering and then
your app can mix and send the data to the real hardware.
On Nov 26, 2007, at 2:22 PM, Bob Smith wrote:
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).
--
Jeff Moore
Core Audio
Apple
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