groupId property
The MediaTrackSettings dictionary's
groupId property is a browsing-session unique
string which identifies the group of devices which includes the source
for the MediaStreamTrack. This lets you determine what value was
selected
to comply with your specified constraints for this property's value as
described in the
MediaTrackConstraints.groupId property you provided when calling either
MediaDevices.getUserMedia.
If needed, you can determine whether or not this constraint is supported by checking the value of MediaTrackSupportedConstraints.groupId as returned by a call to MediaDevices.getSupportedConstraints. However, typically this is unnecessary since browsers will ignore any constraints they're unfamiliar with.
Because doesn't include this information, tracks associated with a WebRTC RTCPeerConnection will never include this property.
Implementation
external String get groupId;Implementation
external set groupId(String value);