AddTrack to MediaStream not working

[John Eakin]

Hi,
I am using twilio and get the MediaStream via the Twilio getLocalStream function. If I alter this I should be able to hear this on the Twilio call.

I want to add some audio to the stream, as a test I am using oscillator. Code runs without errors but I don't hear the noise on the call. Does the below look accurate?

document.getElementById('button-play').onclick = function () {
log('Play sound');
var context = new (window.AudioContext || window.webkitAudioContext)();

var destination = context.createMediaStreamDestination();
var oscillator = context.createOscillator();
oscillator.type = 'sine';
oscillator.frequency.value = 440;
oscillator.connect(destination);

var mediaStreamTrack = destination.stream.getAudioTracks()[0];
myConnection.getLocalStream().addTrack(mediaStreamTrack);
oscillator.start();
};

[John Eakin]

Bump

[Philipp Hancke]

you're adding the track to the mediastream but probably not to the peerconnection (if twilio still uses addStream that might actually work due to a quirk in Chrome)? chrome://webrtc-internals might give hints about what happens.

Am Sa., 29. Dez. 2018 um 11:20 Uhr schrieb John Eakin <johne...@gmail.com>:

Bump

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[John Eakin]

It doesn't work in chrome or Edge.
I suspect that MediaStream should already be added to the peer connection as the microphone connection works on the call.

I just can't play a sound on it.
I'll maybe have to raise a ticket with Twilio.
Just wanted to make sure how I was adding the sound to the MediaStream was correct.