feat: Set AV1 as the preferred video codec.

This is done in code for desktop clients. Mobile clients will continue to encode VP8 by default

modules/qualitycontrol/CodecSelection.js

@@ -10,7 +10,7 @@ import browser from '../browser';
 const logger = getLogger(__filename);
 
 // Default video codec preferences on mobile and desktop endpoints.
-const DESKTOP_VIDEO_CODEC_ORDER = [ CodecMimeType.VP9, CodecMimeType.VP8, CodecMimeType.H264, CodecMimeType.AV1 ];
+const DESKTOP_VIDEO_CODEC_ORDER = [ CodecMimeType.AV1, CodecMimeType.VP9, CodecMimeType.VP8, CodecMimeType.H264 ];
 const MOBILE_P2P_VIDEO_CODEC_ORDER = [ CodecMimeType.H264, CodecMimeType.VP8, CodecMimeType.VP9, CodecMimeType.AV1 ];
 const MOBILE_VIDEO_CODEC_ORDER = [ CodecMimeType.VP8, CodecMimeType.VP9, CodecMimeType.H264, CodecMimeType.AV1 ];
 

modules/qualitycontrol/QualityController.ts

@@ -131,7 +131,7 @@ export class QualityController {
 
         this._codecController = new CodecSelection(conference, { jvb,
             p2p });
-        this._enableAdaptiveMode = options.enableAdaptiveMode;
+        this._enableAdaptiveMode = options.enableAdaptiveMode ?? true;
         this._encodeTimeStats = new Map();
         this._isLastNRampupBlocked = false;
         this._lastNRampupTime = options.lastNRampupTime;

modules/xmpp/JingleSessionPC.js

@@ -1250,7 +1250,9 @@ export default class JingleSessionPC extends JingleSession {
         pcOptions.codecSettings = options.codecSettings;
         pcOptions.enableInsertableStreams = options.enableInsertableStreams;
         pcOptions.usesCodecSelectionAPI = this.usesCodecSelectionAPI
-            = browser.supportsCodecSelectionAPI() && options.testing?.enableCodecSelectionAPI && !this.isP2P;
+            = browser.supportsCodecSelectionAPI()
+            && (options.testing?.enableCodecSelectionAPI ?? true)
+            && !this.isP2P;
 
         if (options.videoQuality) {
             const settings = Object.entries(options.videoQuality)