Speaker devices may not always work with all microphones

[youennf]

On iOS (and maybe on Android devices), selecting BT microphone allows using BT speakers but might not allow using connected USB speakers.

If a user decides to change from built-in microphone to BT microphone, and the audio was routed to a USB speaker, audio will be rerouted, most probably to BT speakers.

There is currently no way to allow a web site to know which combo can work.
There is also currently no way to allow a web site to know whether audio rerouting happened.

It would be good to discuss what could be done in those circumstances.

[youennf]

enumerateDevices/devicechange events could be used to make disappear devices that cannot be used with being used devices (If I capture with BT microphone, we could stop exposing USB speakers, or conversely, if using USB speakers, we could decide to not expose BT microphone).

Or we could expose additional information on MediaDeviceInfo for instance.