Programming WebRTC

Implementing Backward-Compatible Fixes

All the examples in this appendix represent modifications to the signaling- and WebRTC-callback logic from a basic peer-to-peer application. To see these fixes as applied to a multipeer application, have a look at the example in the book’s companion source code in the deploy/ directory.

Let’s look at these fixes in source-code order.

Adding a New State Property

The first fix is to add a new isSuppressingInitialOffer state property to $self:

const $self = {
  rtcConfig: null,
  isPolite: false,
  isMakingOffer: false,
  isIgnoringOffer: false,
  isSettingRemoteAnswerPending: false,
  isSuppressingInitialOffer: false,
  mediaConstraints: { audio: true, video: true },
  mediaStream: new