How to make A2DP and HSP work simultaneously

Question

I have a bluetooth headset. When connecting it to Windows 10, it installs two profiles in Playback devices list:

1. Hands-Free. (HSP profile)

2. Stereo. (A2DP profile)

The Second one (Stereo) is set to be the "Default Device" and the "Default Communication Device" on the system.

When I start any program that uses the mic (recorder, chat, VoIP Calls, gaming, etc.) The sound suddenly stops working And I can only use the mic until I stop the recorder or the call.

To enable the sound again I need to make the Hands-Free (HSP) profile handle both input and output (sound and mic). Unfortunately, HSP gives really poor sound quality.

I want to know If there is a way, using code, I can change Bluetooth behavior so the two profiles work simultaneously. One handles the sound and one handles the mic so I can have high quality sound and use the mic at the same time.

Gladiate

Usually not. Only one sound device can be in use and one has the nice stereo sound, another has mic. – Shana

Answer 1

You will probably never find a solution. I had the same problem (I was trying to create a walkie talkie with 2 headsets connected to the same smartphone). On Windows (but also on Android) you can't access directly to a BT-microphone or BT-speaker because it is automatically detected as BT headset and the OS take the control of the device. Your app can then access the OS-device and not directly the hardware device. The only OS able to do that was Symbian I think which had the most BT-protocols. On Windows you will probably never be able to do that and on Android you have to write your own A2DP-protocol if you want to access the device directly without OS interference.

So sad...

Abusive

So, is this still impossible 3 years later? – Curiosity

I never tried it again. But with all the problems we have with bt and android 10, I think it is even more difficult now. – Abusive

Answer 2

Luckily, under windows you can define different devices for communications and sound. So, you have two choices:

• Choosing Hands-free for both mic/speaker only for communication (which will switch back to A2DP after the call/teams).
• Choosing another mic for communication which allow you to still use the speaker profile even in communication.

That is a bluetooth restriction : A2DP (high quality audio) cannot be use simultaneously with HFP (hands-free profile)

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