fix: Enable "encodedInsertableStreams" on browsers supporting it.

src/utils/browserCheck.ts

@@ -77,3 +77,29 @@
 		showError(unsupportedWarning, { timeout: TOAST_PERMANENT_TIMEOUT })
 	}
 }
+
+/**
+ * Check if the browser supports WebRTC Encoded Transform (i.e. Firefox).
+ */
+export function supportsEncodedTransform() {
+	return (window.RTCRtpScriptTransform && window.RTCRtpSender && 'transform' in RTCRtpSender.prototype)
+}
+
+/**
+ * Check if the browser supports insertable streams (i.e. Chromium).
+ */
+export function supportsInsertableStreams() {
+	if (!(window.RTCRtpReceiver && 'createEncodedStreams' in RTCRtpReceiver.prototype && window.RTCRtpSender && 'createEncodedStreams' in RTCRtpSender.prototype)) {
+		return false
+	}
+
+	// Feature-detect transferable streams which we need to operate in a worker.
+	// See https://groups.google.com/a/chromium.org/g/blink-dev/c/1LStSgBt6AM/m/hj0odB8pCAAJ
+	const stream = new ReadableStream()
+	try {
+		window.postMessage(stream, '*', [stream])
+		return true
+	} catch {
+		return false
+	}
+}

src/utils/e2ee/encryption.js

@@ -14,16 +14,11 @@ import Deferred from './JitsiDeferred.js'
 import E2EEcontext from './JitsiE2EEContext.js'
 import initializeOlm from './olm.js'
 import { hasTalkFeature, getTalkConfig } from '../../services/CapabilitiesManager.ts'
+import { supportsEncodedTransform, supportsInsertableStreams } from '../browserCheck.ts'
 import Signaling from '../signaling.js'
 import Peer from '../webrtc/simplewebrtc/peer.js'
 import SimpleWebRTC from '../webrtc/simplewebrtc/simplewebrtc.js'
 
-const supportsTransform
-	// Firefox
-	= (window.RTCRtpScriptTransform && window.RTCRtpSender && 'transform' in RTCRtpSender.prototype)
-	// Chrome
-	|| (window.RTCRtpReceiver && 'createEncodedStreams' in RTCRtpReceiver.prototype && window.RTCRtpSender && 'createEncodedStreams' in RTCRtpSender.prototype)
-
 // Period which we'll wait before updating / rotating our keys when a participant
 // joins or leaves.
 const DEBOUNCE_PERIOD = 5000
@@ -45,7 +40,7 @@ class Encryption {
 	 * @async
 	 */
 	static async isSupported() {
-		if (!supportsTransform) {
+		if (!supportsEncodedTransform() && !supportsInsertableStreams()) {
 			throw new Error('stream transform is not supported')
 		}
 

src/utils/webrtc/simplewebrtc/webrtc.js

@@ -10,6 +10,7 @@ import webrtcSupport from 'webrtcsupport'
 
 import localMedia from './localmedia.js'
 import Peer from './peer.js'
+import { supportsInsertableStreams } from '../../browserCheck.ts'
 
 /**
  * @param {object} opts the options object.
@@ -37,6 +38,10 @@ export default function WebRTC(opts) {
 	}
 	let item
 
+	if (supportsInsertableStreams()) {
+		this.config.peerConnectionConfig.encodedInsertableStreams = true
+	}
+
 	// We also allow a 'logger' option. It can be any object that implements
 	// log, warn, and error methods.
 	// We log nothing by default, following "the rule of silence":