Embed logo in antmedia live stream via canvas - html5-canvas

Question

Am following the blog at https://antmedia.io/how-to-merge-live-stream-and-canvas-in-webrtc-easily/ that explains how to embed a logo in antmedia live stream. However, I couldn't quite figure out to initialise a localStream with javascript SDK as illustrated in the blog. Specifically, where is the implementation of initWebRTCAdaptor():
//initialize the webRTCAdaptor with the localStream created.
//initWebRTCAdaptor method is implemented below
initWebRTCAdaptor(localStream);
A complete working sample would be very helpful.

Answer 1

It seems that blog post is not fully up to date.
Let me share what to do to have this feature.
Just add a localStream parameter to the WebRTCAdaptor constructor.
Secondly, use the below code in place of initWebRTCAdaptor
For the full code, please take a look at this gist.
https://gist.github.com/mekya/d7d21f78e7ecb2c34d89bd6ec5bf5799
Make sure that you use your own image in image.src.(Use local images)
var canvas = document.getElementById('canvas');
var vid = document.getElementById('localVideo');
var image=new Image();
image.src="images/play.png";
function draw() {
if (canvas.getContext) {
var ctx = canvas.getContext('2d');
ctx.drawImage(vid, 0, 0, 200, 150);
ctx.drawImage(image,50, 10, 100, 30);
}
}
setInterval(function() { draw(); }, 50);
//capture stream from canvas
var localStream = canvas.captureStream(25);
navigator.mediaDevices.getUserMedia({video: true, audio:true}).then(function (stream) {
var video = document.querySelector('video#localVideo');
video.srcObject = stream;
video.onloadedmetadata = function(e) {
video.play();
};
//initialize the webRTCAdaptor with the localStream created.
//initWebRTCAdaptor method is implemented below
localStream.addTrack(stream.getAudioTracks()[0]);
initWebRTCAdaptor(false, autoRepublishEnabled);
});