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Re: Recommended way to setup a timer in a CoreAudion application?
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Re: Recommended way to setup a timer in a CoreAudion application?


  • Subject: Re: Recommended way to setup a timer in a CoreAudion application?
  • From: Brian Willoughby <email@hidden>
  • Date: Wed, 16 Jan 2008 01:58:10 -0800

Hmm, perhaps you can set a timer to fire after your "certain amount of time" whenever you are notified of "OFF" and then cancel this timer whenever you receive "ON." This way, the timer will only trigger your failure code if the device stays OFF for a long time, but the whole thing will just be cancelled if the dropout is a few milliseconds.

It's been a while since I used timers, but I believe there is still a way to set a future event and then cancel it before it fires.

Brian Willoughby
Sound Consulting


On Jan 16, 2008, at 01:49, Stéphane Letz wrote:

Le 16 janv. 08 à 10:44, Brian Willoughby a écrit :
My first reaction is that you should not need to set up a timer to poll for an audio failure condition. It seems like you could register a callback for a notification when the audio driver stops running. If you're writing a custom driver, then perhaps you should send such a notification.

The thing is that my code is listening to kAudioDevicePropertyDeviceIsRunning so that do detect the observed device is not running anymore. But in lot of cases I see a sequence of kAudioDevicePropertyDeviceIsRunning OFF followed by kAudioDevicePropertyDeviceIsRunning ON just a few millisec after (for example when a sample rate change is done on the device that is observed).
The result that listening to kAudioDevicePropertyDeviceIsRunning OFF is not enough: I would need to be sure this condition stay for a certain amount of time, thus the timer idea. But maybe there is a better way to do that.


Thanks

Stehane Letz

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  • Follow-Ups:
    • Re: Recommended way to setup a timer in a CoreAudion application?
      • From: Stéphane Letz <email@hidden>
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References: 
 >Recommended way to setup a timer in a CoreAudion application? (From: Stéphane Letz <email@hidden>)
 >Re: Recommended way to setup a timer in a CoreAudion application? (From: Brian Willoughby <email@hidden>)
 >Re: Recommended way to setup a timer in a CoreAudion application? (From: Stéphane Letz <email@hidden>)

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