fix(voice): allow av1 and vp9 screen shares in firefox (#3108)

fluxer_app/pkgs/livekit-client/src/index.ts

@@ -54,6 +54,7 @@ import {
 	supportsAV1,
 	supportsDynacast,
 	supportsH265,
+	supportsScalabilityMode,
 	supportsVideoCodec,
 	supportsVP9,
 } from './room/utils.ts';
@@ -176,6 +177,7 @@ export {
 	supportsAV1,
 	supportsDynacast,
 	supportsH265,
+	supportsScalabilityMode,
 	supportsVideoCodec,
 	supportsVP9,
 	TrackPublication,

fluxer_app/pkgs/livekit-client/src/room/participant/LocalParticipant.ts

@@ -110,6 +110,7 @@ import {
 	selectPreferredVideoCodec,
 	sleep,
 	stopTransceiversForSender,
+	supportsScalabilityMode,
 	supportsVideoCodec,
 	usesLegacySVCEncodings,
 } from '../utils.ts';
@@ -978,6 +979,9 @@ export default class LocalParticipant extends Participant {
 		}
 
 		const videoCodec = opts.videoCodec;
+		if (!supportsScalabilityMode()) {
+			delete opts.scalabilityMode;
+		}
 
 		track.on(TrackEvent.Muted, this.onTrackMuted);
 		track.on(TrackEvent.Unmuted, this.onTrackUnmuted);
@@ -1055,7 +1059,12 @@ export default class LocalParticipant extends Participant {
 				}
 
 				const svcSimulcast = isSVCSimulcast(videoCodec, opts);
-				if (isSVCCodec(videoCodec) && !svcSimulcast && track.source !== Track.Source.ScreenShare) {
+				if (
+					isSVCCodec(videoCodec) &&
+					!svcSimulcast &&
+					track.source !== Track.Source.ScreenShare &&
+					supportsScalabilityMode()
+				) {
 					opts.scalabilityMode = opts.scalabilityMode ?? 'L3T3_KEY';
 				}
 

fluxer_app/pkgs/livekit-client/src/room/utils.ts

@@ -66,7 +66,7 @@ export function supportsDynacast() {
 }
 
 export function supportsAV1(): boolean {
-	if (isSafari() || isFireFox()) {
+	if (isSafari()) {
 		return false;
 	}
 	return hasSenderMimeType('video/av1') || hasSenderMimeType('video/av1x');
@@ -80,9 +80,6 @@ export function supportsH265(): boolean {
 }
 
 export function supportsVP9(): boolean {
-	if (isFireFox()) {
-		return false;
-	}
 	if (isSafari()) {
 		const browser = getBrowser();
 		if (browser?.version && compareVersions(browser.version, '16') < 0) {
@@ -133,6 +130,10 @@ function hasSenderMimeType(mimeType: string): boolean {
 	return capabilities.codecs.some((codec) => codec.mimeType.toLowerCase() === lower);
 }
 
+export function supportsScalabilityMode(): boolean {
+	return !isFireFox();
+}
+
 export function isSVCCodec(codec?: string): boolean {
 	return codec === 'av1' || codec === 'vp9';
 }