WebRTC - How to identify the source IDs (device IDs) for a MediaStream(Tracks)

Question

Once I have established a WebRTC connection, I can getLocalStreams and getRemoteStreams.

The streams have their own ID. Each stream is made of audio/video tracks MediaStreamTrack.

I'd like to be able to identify the device/source (ID) used for each track in order to avoid adding a stream that was already added to the connection.

In other word, I was thinking to make a check in connection.onaddstream that the stream track is not already present in my list of local or remote streams.

Any suggestions?

Answer 1

For each MediaStreamTrack you can call .getCapabilities().deviceId to get the deviceId.

But I'm not sure if you can use the same device id within the same browser twice.

Answer 2

.getSettings().deviceId on audio/video track (instance of MediaStreamTrack) will return deviceId that is same as deviceId returned from enumerateDevices()