Building Speakeasy – WebRTC in the Real-World

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BUILDING SPEAKEASY WEBRTC IN THE REAL-WORLD

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WHAT WENT RIGHT?

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simple-peer

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MODERATION

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WHAT WENT WRONG?

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IOS BUGS

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IOS BUG #1 > 10% of the time, audio is muted for one end of the WebRTC call1 > Fixed in iOS 13.6 1 https://bugs.webkit.org/show_bug.cgi?id=212669

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IOS BUG #1 - HMM... THIS IS STRANGE > Open inspector > Select video element > Open console $0.pause() $0.play() > Suddenly it works!

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IOS BUG #1 - THE HACKY FIX const handlePlay = () => { videoEl.pause() } const handlePause = () => { videoEl.play().catch(() => {}) } videoEl.addEventListener('play', handlePlay, { once: true }) videoEl.addEventListener('pause', handlePause, { once: true })

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IOS BUG #2 > Second invocation of getUserMedia() breaks video stream from first invocation2 > Seems intentional, still an issue in iOS 14 2 https://bugs.webkit.org/show_bug.cgi?id=179363

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IOS BUG #2 - APPLY CONSTRAINTS const smallStream = stream.clone() const videoTracks = smallStream.getVideoTracks() for (let i = 0, len = videoTracks.length; i < len; i += 1) { const track = videoTracks[i] await track.applyConstraints({ width: 640, height: 360 }) }

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IOS BUG #2 - HACKY FIX if (isIos) { return stream } // ...rest of implementation below

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IOS BUG #3 > Camera/microphone do not work when app is added to homescreen3 > Fixed in iOS 13.5.1 3 https://bugs.webkit.org/show_bug.cgi?id=185448

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IOS BUG #4 > Switching to another app and back to Safari breaks local stream > Seems fixed in iOS 13.5

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IOS BUG #4 - THE HACKY FIX const handleVisibilityChange = () => { if (!document.hidden) { videoEl.pause() videoEl.play().catch(() => {}) } } document.addEventListener('visibilitychange', handleVisibilityChange)

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IOS BUG #5 > Connecting or disconnecting AirPods permanently breaks remote stream5 > Seems fixed in iOS 14, but issue remains open 5 https://bugs.webkit.org/show_bug.cgi?id=209594

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IOS BUG #5 - THE HACKY FIX const handlePause = () => { videoElem.play().catch(() => {}) } videoElem.addEventListener('pause', handlePause)

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IOS BUG #6 > Cannot select 1080p video stream. The highest that does not error is 720p6 > Native apps don't have this problem 6 https://bugs.webkit.org/show_bug.cgi?id=179994

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IOS BUG #6 - THE HACKY FIX const VIDEO_CONSTRAINTS = { video: isIos ? { width: 1280, height: 720 } : { width: 1920, height: 1080 }, audio: true }

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IOS BUG #7 > WKWebView doesn't support WebRTC API7 > Third-party browsers must use WKWebView > So WebRTC apps do not work in third-party browsers like Chrome, Firefox, Brave 7 https://bugs.webkit.org/show_bug.cgi?id=188360

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