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Re: Help with monitoring system-wide audio

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Re: Help with monitoring system-wide audio

Subject: Re: Help with monitoring system-wide audio
From: Jaime Magiera <email@hidden>
Date: Mon, 26 Nov 2007 17:34:46 -0500


On Nov 26, 2007, at 5:22 PM, Bob Smith wrote:

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

Hello,

Basically, you have a SequenceGrabber for the audio device. You set that SG into PreviewMode. Then you query the the properties kQTSGAudioPropertyID_ChannelMap, then kQTSGAudioPropertyID_AveragePowerLevels, then kQTSGAudioPropertyID_PeakHoldLevels. There's a little math in there, but it's easy.

There was sample code called "Silly Meters" or "Silly Levels", something to that effect. Also, there is a good example of how to do metering in "WhackTV".

If you can't figure it out from those examples, let us know.

hth,

Jaime
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Re: Help with monitoring system-wide audio
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  >Help with monitoring system-wide audio (From: Bob Smith <email@hidden>)




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