AVAudioSession: Some Bluetooth devices are not working properly on my App - ios

Question

I'm developing a swift audio/video and text chat iOS App using AVAudioSession.
Whenever I select to use some Bluetooth devices the sound played on the device is not the App audio stream. They play only the system sound sent by text chat library whenever messages are sent/received instead. It doesn't happen on all Bluetooth devices, on some of them everything works fine. On Builtin Mic and Speaker the App works fine too.
Here are the most important methods from my class to manage the device:
class MyAudioSession
{
private var mAudioSession: AVAudioSession;
init!()
{
self.mAudioSession = AVAudioSession.sharedInstance();
do {
try self.mAudioSession.setActive(false);
try self.mAudioSession.setCategory(AVAudioSessionCategoryPlayAndRecord, withOptions: .AllowBluetooth);
try self.mAudioSession.setMode(AVAudioSessionModeVideoChat);
try self.mAudioSession.setActive(true);
}
catch {
return nil;
}
}
func switchToDevice(device: AVAudioSessionPortDescription!) -> Bool
{
var ret = false;
if (device != nil) {
do {
try self.mAudioSession.setPreferredInput(device);
ret = true;
}
catch {
self.logSwitch(device, error: error);
}
}
return ret;
}
}
I'd like to understand why my App is not working fine on just SOME Bluetooth devices. These same devices work properly on the other Apps on my Cel.
I did another test: I changed all of this for MPVolumeView, and exactly the same issue occurred, so the problem seems to be on audio player.
Could anybody give me a suggestion to fix this ?
Thx.

Answer 1

Jorg,
While this might not be the best answer I have been able to overcome the weird Bluetooth issues. My problem seems to be similar to yours as I too was using:
AVAudioSessionCategoryPlayAndRecord
This was causing issues for me on some Bluetooth devices (not all but some).
What I wound up doing was setting the Category to:
AVAudioSessionCategoryPlayback
Then when ever I needed to record I would switch the Category over to:
AVAudioSessionCategoryRecord
Then back to Playback after completing my recording.
This was the only way at this time I could get a consistent result from switching between the different outputs (Speaker, Headphones, Bluetooth).
Hope that helps some. Guessing this is a bug in the "AVAudioSessionCategoryPlayAndRecord"