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Sample rate with bluetooth headphone and AVAudioSessionCategoryPlayAndRecord
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Sample rate with bluetooth headphone and AVAudioSessionCategoryPlayAndRecord


  • Subject: Sample rate with bluetooth headphone and AVAudioSessionCategoryPlayAndRecord
  • From: Beinan Li <email@hidden>
  • Date: Fri, 06 Mar 2015 11:47:19 -0500

Hi CoreAudio,

When using AVAudioSessionCategoryPlayAndRecord,
if the app start off with a plugged headphone, the sample rate is 
whatever we set it to before enabling the session and AU output;
however, when it switches to a bluetooth headphone, 
the sample rate is force-lowered to 8kHz internally, 
observed in RouteChangeNotification handler. 
This does not happen with AVAudioSessionCategoryAmbient.

I'm trying to figure out if this is by design but I cannot find 
a doc section or a tech note about this in the Xcode doc.

Can anyone clarify this?

Thanks,
Beinan

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