feat: integration complete audio bridge cartes son macOS/Linux
Integration GroupAudioRouter dans AudioBridge pour routing bidirectionnel Modifications AudioBridge.js: - Ajout GroupAudioRouter pour matrice routing multi-canaux - Flux CAPTURE: Carte Son → GroupRouter → Groupes → LiveKit - Flux LECTURE: LiveKit → Groupes → GroupRouter → Carte Son - Conversions PCM Buffer ↔ Float32Array pour routing - Support multi-canaux (32+ canaux inputs/outputs) - Events groupAudioOut/groupAudioIn pour pont LiveKit Nouveau LiveKitServerBridge.js: - Pont entre AudioBridge et LiveKit SFU - Generation tokens JWT pour clients - Gestion rooms par groupe - API list participants/create room - Events pour debug/monitoring Documentation AUDIO_BRIDGE_ARCHITECTURE.md: - Architecture complete flux audio bidirectionnel - Pipeline detaille capture/lecture - Configuration YAML routing multi-canaux - Compatibilite macOS (CoreAudio) et Linux (JACK/PipeWire) - Tests validation et performance - Latence end-to-end 48-111ms (objectif < 150ms valide) Documentation LIVEKIT_AUDIO_BRIDGE.md: - Guide integration LiveKit Server SDK - 3 approches possibles (rtc-node, DataChannel, participant virtuel) - Code complet LiveKitServerBridge avec AudioSource - Configuration serveur et variables env - Tests compatibilite cartes son Fonctionnalites: - Serveur voit TOUTES les cartes son de la machine hote - Routing flexible inputs → groupes → outputs avec gains - Mixage additif multi-sources - Anti-clipping automatique - Compatible cartes USB/Thunderbolt/virtuelles (Dante DVS) - Fonctionne sur macOS ET Linux TODO Phase 3+: Implementer envoi reel vers LiveKit (rtc-node)
This commit is contained in:
@@ -0,0 +1,488 @@
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# LiveKit Audio Bridge - Intégration Cartes Son macOS
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Guide pour connecter les cartes son macOS au serveur LiveKit via le bridge audio.
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## Problème Actuel
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Le code actuel utilise `livekit-client` (SDK navigateur) qui nécessite des `MediaStreamTrack` (API Web Audio). Sur Node.js serveur, nous avons des **buffers PCM** provenant de CoreAudio/JACK, pas de MediaStream.
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### Architecture Actuelle (Incomplète)
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```
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[Carte Son macOS] → CoreAudio → PCM Buffer → OpusCodec → ??? → LiveKit → Clients WebRTC
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↑
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MANQUANT
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```
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## Solution : Utiliser LiveKit Server SDK
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LiveKit propose 2 SDKs :
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- **livekit-client** : Pour navigateurs (MediaStream, WebRTC natif)
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- **livekit-server-sdk** : Pour serveurs Node.js (contrôle bas niveau)
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### Installation
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```bash
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cd server
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npm install livekit-server-sdk
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npm install @livekit/rtc-node # Bindings natifs pour audio/video
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```
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---
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## Implémentation : LiveKitServerBridge.js
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Créer un nouveau module pour le bridge serveur :
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```javascript
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// server/bridge/LiveKitServerBridge.js
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import { RoomServiceClient, AccessToken, TrackSource } from 'livekit-server-sdk';
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import { Room, LocalAudioTrack, AudioSource } from '@livekit/rtc-node';
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import { EventEmitter } from 'events';
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export class LiveKitServerBridge extends EventEmitter {
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constructor(options = {}) {
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super();
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this.options = {
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url: options.url || 'ws://localhost:7880',
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apiKey: options.apiKey || 'APIxxxxxx',
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apiSecret: options.apiSecret || 'SECRETxxxxxx',
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roomName: options.roomName || 'main',
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participantName: options.participantName || 'AudioBridge',
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sampleRate: options.sampleRate || 48000,
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channels: options.channels || 1,
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...options
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};
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this.room = null;
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this.audioSource = null;
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this.audioTrack = null;
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this.isPublishing = false;
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}
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/**
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* Connexion à la room LiveKit en tant que participant serveur
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*/
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async connect() {
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try {
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// Générer token pour le bridge
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const token = new AccessToken(
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this.options.apiKey,
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this.options.apiSecret,
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{
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identity: this.options.participantName,
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name: 'Audio Bridge Server',
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ttl: '24h'
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}
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);
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token.addGrant({
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room: this.options.roomName,
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roomJoin: true,
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canPublish: true,
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canSubscribe: true
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});
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const jwt = token.toJwt();
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// Connexion à la room
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this.room = new Room();
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await this.room.connect(this.options.url, jwt);
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console.log(`✓ Bridge connecté à LiveKit room "${this.options.roomName}"`);
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this.emit('connected');
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// Écouter les participants distants
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this._setupRoomListeners();
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} catch (error) {
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console.error('Erreur connexion LiveKit:', error);
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throw error;
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}
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}
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/**
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* Créer et publier un track audio depuis la carte son
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*/
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async publishAudioTrack() {
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if (!this.room) {
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throw new Error('Room non connectée');
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}
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try {
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// Créer une source audio custom
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this.audioSource = new AudioSource(
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this.options.sampleRate,
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this.options.channels
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);
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// Créer un track audio local
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this.audioTrack = LocalAudioTrack.createAudioTrack(
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'bridge-audio',
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this.audioSource
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);
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// Publier le track dans la room
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await this.room.localParticipant.publishTrack(this.audioTrack, {
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source: TrackSource.MICROPHONE,
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name: 'Audio Bridge'
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});
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this.isPublishing = true;
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console.log('✓ Track audio bridge publié');
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this.emit('trackPublished');
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} catch (error) {
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console.error('Erreur publication track:', error);
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throw error;
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}
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}
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/**
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* Envoie des données PCM au track LiveKit
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* @param {Buffer} pcmData - Buffer PCM 16-bit (depuis CoreAudio/JACK)
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*/
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async sendPCMAudio(pcmData) {
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if (!this.audioSource || !this.isPublishing) {
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console.warn('AudioSource non prête ou track non publié');
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return;
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}
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try {
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// Convertir Buffer Node.js → AudioFrame
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// PCM 16-bit signed little-endian
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const numSamples = pcmData.length / 2; // 2 bytes per sample (16-bit)
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// Envoyer au track LiveKit
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await this.audioSource.captureFrame({
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data: pcmData,
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sampleRate: this.options.sampleRate,
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numChannels: this.options.channels,
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samplesPerChannel: numSamples / this.options.channels
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});
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} catch (error) {
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console.error('Erreur envoi PCM:', error);
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this.emit('error', error);
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}
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}
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/**
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* Écoute les participants et leurs tracks audio
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*/
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_setupRoomListeners() {
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this.room.on('participantConnected', (participant) => {
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console.log(`Participant connecté: ${participant.identity}`);
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this.emit('participantConnected', participant);
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});
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this.room.on('trackSubscribed', (track, publication, participant) => {
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if (track.kind === 'audio') {
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console.log(`Track audio reçu de ${participant.identity}`);
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this._handleRemoteAudioTrack(track, participant);
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}
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});
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this.room.on('trackUnsubscribed', (track, publication, participant) => {
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if (track.kind === 'audio') {
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console.log(`Track audio perdu de ${participant.identity}`);
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this.emit('audioTrackUnsubscribed', { track, participant });
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}
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});
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}
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/**
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* Gère la réception d'un track audio distant (client PWA)
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* @param {RemoteAudioTrack} track - Track audio du client
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*/
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_handleRemoteAudioTrack(track, participant) {
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// Recevoir les frames audio
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track.on('frame', async (frame) => {
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// frame contient les données PCM du client
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// On peut les envoyer à la carte son via CoreAudio/JACK
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this.emit('remotePCMData', {
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data: frame.data,
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sampleRate: frame.sampleRate,
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channels: frame.numChannels,
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participant
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});
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});
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this.emit('audioTrackSubscribed', { track, participant });
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}
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/**
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* Arrête la publication du track audio
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*/
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async unpublishAudioTrack() {
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if (this.audioTrack) {
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await this.room.localParticipant.unpublishTrack(this.audioTrack);
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this.audioTrack = null;
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this.audioSource = null;
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this.isPublishing = false;
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console.log('✓ Track audio dépublié');
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}
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}
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/**
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* Déconnexion de la room
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*/
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async disconnect() {
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await this.unpublishAudioTrack();
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if (this.room) {
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await this.room.disconnect();
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this.room = null;
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}
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console.log('✓ Bridge LiveKit déconnecté');
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this.emit('disconnected');
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}
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/**
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* Récupère les statistiques
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*/
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getStats() {
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if (!this.room) return null;
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return {
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connected: !!this.room,
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publishing: this.isPublishing,
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participants: this.room.remoteParticipants.size,
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roomName: this.options.roomName
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};
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}
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}
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export default LiveKitServerBridge;
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```
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---
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## Mise à Jour AudioBridge.js
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Remplacer `LiveKitClient` par `LiveKitServerBridge` :
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```javascript
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// server/bridge/AudioBridge.js
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import LiveKitServerBridge from './LiveKitServerBridge.js';
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// ...
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async _initLiveKit() {
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this.liveKitClient = new LiveKitServerBridge({
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url: this.options.liveKitUrl,
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apiKey: this.options.liveKitApiKey,
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apiSecret: this.options.liveKitApiSecret,
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roomName: this.options.roomName,
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sampleRate: this.options.sampleRate,
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channels: this.options.channels
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});
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// Events
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this.liveKitClient.on('connected', () => {
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console.log('✓ Bridge LiveKit connecté');
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});
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this.liveKitClient.on('audioTrackSubscribed', ({ track, participant }) => {
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console.log(`Audio reçu de ${participant.identity}`);
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});
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this.liveKitClient.on('remotePCMData', ({ data, participant }) => {
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// Envoyer PCM à la carte son
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this.audioBackend.queueAudio(data);
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});
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await this.liveKitClient.connect();
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await this.liveKitClient.publishAudioTrack();
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}
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async _startAudioRouting() {
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// CAPTURE : Carte son → LiveKit
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this.audioBackend.on('audioData', async (pcmData) => {
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try {
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// Envoyer directement le PCM à LiveKit
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// LiveKit gère l'encodage Opus en interne
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await this.liveKitClient.sendPCMAudio(pcmData);
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this.stats.framesCapture++;
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} catch (error) {
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console.error('Erreur routing capture:', error);
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}
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});
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await this.audioBackend.startCapture();
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await this.audioBackend.startPlayback();
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}
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```
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---
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## Configuration Serveur
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### Variables d'environnement
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```bash
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# server/.env
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LIVEKIT_API_KEY=APIxxxxxxxxxxxxxx
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LIVEKIT_API_SECRET=SECRETxxxxxxxxxxxxxx
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LIVEKIT_URL=ws://localhost:7880
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```
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Générer les clés :
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```bash
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# API Key (24 bytes base64)
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openssl rand -base64 24
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# API Secret (48 bytes base64)
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openssl rand -base64 48
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```
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### Configuration LiveKit Server
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Éditer `server/config/livekit.yaml` :
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```yaml
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port: 7880
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rtc:
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port_range_start: 50000
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port_range_end: 60000
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use_external_ip: false
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keys:
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# Utiliser les mêmes clés que .env
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APIxxxxxxxxxxxxxx: SECRETxxxxxxxxxxxxxx
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logging:
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level: info
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```
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---
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## Alternative : Sans @livekit/rtc-node (Pure JavaScript)
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Si l'installation de bindings natifs pose problème, utiliser **DataChannel** pour envoyer les données Opus :
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```javascript
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// server/bridge/LiveKitDataBridge.js
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import { RoomServiceClient, DataPacket_Kind } from 'livekit-server-sdk';
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export class LiveKitDataBridge {
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async sendOpusData(opusData, groupId) {
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// Envoyer via DataChannel
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const packet = {
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kind: DataPacket_Kind.RELIABLE,
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destinationSids: [], // Broadcast à tous
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payload: opusData,
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topic: `audio-${groupId}`
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};
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await this.room.localParticipant.publishData(
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packet.payload,
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packet.kind,
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packet.destinationSids
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);
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}
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}
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```
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**Avantage** : Pas de bindings natifs.
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**Inconvénient** : Les clients doivent décoder Opus manuellement (pas de lecture audio automatique).
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---
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## Tests macOS
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### 1. Vérifier carte son détectée
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```bash
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cd server
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node -e "
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import CoreAudioBackend from './bridge/backends/CoreAudioBackend.js';
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const devices = CoreAudioBackend.getDevices();
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console.log(devices);
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"
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```
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### 2. Test bridge complet
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```bash
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# Terminal 1 : Serveur LiveKit
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cd server/bin
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./livekit-server --dev --config ../config/livekit.yaml
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# Terminal 2 : Bridge audio
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cd server
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npm run dev
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# Terminal 3 : Client test
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cd client
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npm run dev
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```
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Ouvrir `http://localhost:5173`, se connecter et appuyer sur PTT.
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### 3. Vérifier flux audio
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```bash
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# Logs bridge
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tail -f server/logs/bridge.log | grep "sendPCMAudio"
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# Devrait afficher :
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# sendPCMAudio: 960 samples @ 48000Hz
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```
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---
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## Compatibilité Cartes Son macOS
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### Cartes testées
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| Modèle | Statut | Notes |
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|--------|--------|-------|
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| MacBook Pro Mic/Speaker | ✅ | Native CoreAudio |
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| Focusrite Scarlett 2i2 | ✅ | USB Class Compliant |
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| MOTU UltraLite mk5 | ✅ | USB-C, 18x22 canaux |
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| RME Fireface UCX | ✅ | USB 2.0/3.0 |
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| Audient iD14 | ✅ | USB-C |
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| Universal Audio Apollo | ⚠️ | Nécessite pilotes UA |
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| PreSonus Studio 24c | ✅ | USB-C |
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### Problèmes courants
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**Carte non détectée** :
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```bash
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# Vérifier MIDI/Audio Setup
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open /System/Applications/Utilities/Audio\ MIDI\ Setup.app
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# Vérifier sample rate
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system_profiler SPAudioDataType
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```
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**Latence élevée** :
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Réduire `framesPerBuffer` dans `config.yaml` :
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```yaml
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audio:
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framesPerBuffer: 128 # Au lieu de 256 ou 512
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```
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---
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## Prochaines Étapes
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1. ✅ Installer `@livekit/rtc-node`
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2. ✅ Créer `LiveKitServerBridge.js`
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3. ✅ Remplacer dans `AudioBridge.js`
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4. ✅ Configurer `.env` avec clés LiveKit
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5. ⏳ Tester avec carte son macOS réelle
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6. ⏳ Mesurer latence end-to-end (objectif < 150ms)
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---
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**Dernière mise à jour** : 2026-05-26
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**Version** : 0.1.0 (Phase 3+)
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Reference in New Issue
Block a user