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Re: Controling CoreAudio device volume
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Re: Controling CoreAudio device volume


  • Subject: Re: Controling CoreAudio device volume
  • From: Jeff Moore <email@hidden>
  • Date: Mon, 4 Feb 2008 10:58:57 -0800

The "rules" are (and I'm not being facetious), if the device has a control, you can use it. If it doesn't have one, you can't. AudioObjectHasProperty() is your guide. This is true of every kind of device the HAL supports.

On Feb 4, 2008, at 2:05 AM, Stéphane Letz wrote:

We see that some audio devices (like aggregate devices combining a input only and output only device on a Mac Pro intel) loose the ability to be volume controled. What are the "rules" that define how the volume of a device can be controled, depending of the device type: built-in, aggregate device, user-land device ?



--

Jeff Moore
Core Audio
Apple


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References: 
 >Controling CoreAudio device volume (From: Stéphane Letz <email@hidden>)

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