Programming WebRTC

Determining Device Availability

Let’s look at different possible device availability scenarios and write error-handling logic that addresses them. As you’ll see, certain scenarios—like a missing camera, or users denying permission to access a microphone—throw different errors in Firefox, Chrome, and Safari. The sections below provide tables documenting browser-specific behavior and errors under different conditions.

The good news is the code you’ve written over all the previous chapters has avoided tying call-joining logic with media-device permissions and availability: those are separate code paths, and should remain that way. In other words, no app should demand that users grant device access as a pre-condition for joining a call. It’s entirely ...