Sample code with the the simplest possible signaling, and fewest possible dependencies, for cross-browser testing of:

• sending/receiving audio and video tracks
• switching to a different input device and replacing a track
• screen sharing
• subscribing to and unsubscribing from tracks
• pausing tracks for sender and receiver independently
• simulcast
• setting maximum simulcast layer when sending
• setting maximum simulcast layer when receiving
• display of stats
• display of "active speaker"

npm install
DEBUG="mediasoup*, demo-app*" npm run start

Then open http://localhost:3000/

The demo "application" is a single video-call "room." Super simple.

Click on [send camera streams]. You should see listings for your own video and audio track show up, with [subscribe] buttons next to them. Click the [subscribe] button next to the video track to subscribe to your camera feed.

Don't subscribe to your own audio feed. :-)

Open the same page in another tab, window, or browser.

Uncheck the checkboxes to pause producers/consumers. Click on the radio buttons to select a different simulcast layer for sending/receiving.

To send media from a client that's not running on localhost, you'll need to enable HTTPS. Point the sslCrt and sslKey values in config.js at an ssl certificate and key pair. You can use a self-signed certificate.

If sslCrt/sslKey are found, the server will start as an HTTPS rather than an HTTP server. Check the console output to confirm that this happened as expected.

You'll also need to add an entry to the webRtcTransport.listIps array in config.js.

1. Make sure that your instance security group allows inbound TCP to port 3000, inbound UDP to ports 40000-49999, and all outbound traffic.

2. On AWS Linux you'll need to install a newer version of g++ than is included in the Development Tools package group.

# from-scratch install on AWS Linux

sudo yum install git
curl -o- https://raw.githubusercontent.com/creationix/nvm/v0.32.0/install.sh | bash
. ~/.nvm/nvm.sh
nvm install 11
sudo yum groupinstall "Development Tools"
sudo yum install gcc72-c++
git clone https://github.com/daily-co/mediasoup-sandbox.git
cd mediasoup-sandbox/
npm install

3. Make a listenIps entry with ip set to the instance's private IP address, and announcedIp set to the instance's public IPv4 address.

The signaling in this sample code is very, very simple. No websockets. Just a few http endpoints and a http polling at one herz.

All of the server code is in a single file: server.js.

All of the client-side javascript code is in a single file: client.js.

With the goal of making the mediasoup parts of the code as clear and concise as possible, the UI is implemented directly in javascript, without using a framework or any other dependencies. It's not good front-end code! For example, we redraw large parts of the UI each time our one herz polling loop gives us new data. This means that you may have to click on a radio button multiple times for the click to actually work.