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Re: simultaneous audio input/ output
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Re: simultaneous audio input/ output


  • Subject: Re: simultaneous audio input/ output
  • From: Jeff Moore <email@hidden>
  • Date: Thu, 31 Mar 2005 11:52:19 -0800

Simultaneous input and output is the expected behavior of devices capable of it. The driver should not be making the decisions about whether or not to enable/disable it. The applications will tell the driver whether they want to use input and/or output via the client buffers that the HAL registers for each stream with each user client object. If it isn't going to use a given stream, it won't register a buffer for it. If the driver notices that there are no user clients that have any buffers registered for any of the streams in a given direction, it can then optimize the behavior. Until then, the driver should respect the wishes of the applications.

On Mar 31, 2005, at 11:17 AM, Tommy Schell wrote:

Hi,

I do an audio capture and notice that in my audio driver, my clipOutputSamples() routine is being called in addition to
convertInputSamples(), ie, I have simultaneous audio input/ output (although it appears the output in this case is all zero's).
Is there a way to prevent this, to turn off the output when I'm doing input?
Because I want to try to share the input/output buffers.


--

Jeff Moore
Core Audio
Apple


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References: 
 >simultaneous audio input/ output (From: Tommy Schell <email@hidden>)

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