Noah Petherbridge
3f756c5318
* Two users can activate their cameras locally and then connect them together
with WebRTC with video and audio support working!
* Limitation: users need to be broadcasting video themselves before they can
connect to someone's camera. If the offerer doesn't add tracks of their own,
the SDP offer doesn't request video channels; so even though the answerer
adds their tracks to the connection, they aren't used by the offerer.
* As currently implemented, the offerer's camera feed will also appear on
screen for the answerer - every video connection opens the feed both ways.
Compared to the previous commit (where clients shared SDP messages but not
ICE candidates or anything further) the fixes and learnings were:
* The back-end was trying to relay candidate messages, but there was a JSON
marshalling error (json object casted into a string) - changed the Message
type to map[string]interface{} and both sides could exchange ICE candidates.
* Both sides needed to add their video tracks to the connection so that there
was anything of value to be sent over the WebRTC channel.
Other changes:
* Server will send a ping message every minute to connected WebSockets.
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