Source
void addStream(MediaStream stream, [Map mediaConstraints]) { if (mediaConstraints != null) { _blink.BlinkRTCPeerConnection.instance.addStream_Callback_2_(this, stream, convertDartToNative_Dictionary(mediaConstraints)); return; } _blink.BlinkRTCPeerConnection.instance.addStream_Callback_1_(this, stream); return; }