how to add a audio stream on canvas stream in webrtc - webrtc

Question

I want to add an audio stream obtained via getusermedia () to the canvas stream and send it to the remote peer...
So I looked up, and there was addTrack ().
But addTrack () does not seem to work properly. I am running on chrome.
var audioTracks;
navigator.getUserMedia({ "audio": true, "video": false }, function (stream)
{
audioTracks = stream.getAudioTracks()[0];
}, function(error) { console.log(error);});
.
.
.
var sharestream = canvas2.captureStream(25); // 25 FPS
peerConn.addTrack(audioTracks,sharestream);
peerConn.addStream(sharestream);
It's part of my code. What's wrong?
My webrtc full source code works fine, but it does not work with addTrack ().

Answer 1

Updated on 10-29-2018 to replace getAudioTracks with getTracks:
var canvasStream = canvas2d.captureStream(25); // parameter is optional
// get first audio track
// var audioTrack = audioStream.getAudioTracks()[0];
var audioTrack = audioStream.getTracks().filter(function(track) {
return track.kind === 'audio'
})[0];
// append audio track into Canvas2D stream
canvasStream.addTrack( audioTrack );
// now canvas2D stream has both audio and video tracks
// peerConnection.addStream( canvasStream );
canvasStream.getTracks().forEach(function(track) {
peerConnection.Track( track, canvasStream );
});
// create offer or answer descriptions
peerConnection.createOffer(hints).then(success).catch(failure);