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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