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230
frontend/js/voice.js
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230
frontend/js/voice.js
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/* FluentGerman.ai — Voice module (Web Speech API + API mode) */
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class VoiceManager {
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constructor() {
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this.mode = 'browser'; // will be set from server config
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this.recognition = null;
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this.synthesis = window.speechSynthesis;
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this.isRecording = false;
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this.lastInputWasVoice = false; // tracks if last message was spoken
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this.mediaRecorder = null;
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this.audioChunks = [];
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this.onResult = null;
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this.onStateChange = null;
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}
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async init() {
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// Always init browser STT as fallback
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this._initBrowserSTT();
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// Fetch voice mode from server
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try {
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const response = await api('/voice/config');
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if (response?.ok) {
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const config = await response.json();
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this.mode = config.voice_mode;
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console.log('[Voice] Mode:', this.mode);
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}
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} catch (e) {
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console.warn('[Voice] Could not fetch config, using browser mode');
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this.mode = 'browser';
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}
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}
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_initBrowserSTT() {
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const SpeechRecognition = window.SpeechRecognition || window.webkitSpeechRecognition;
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if (!SpeechRecognition) {
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console.warn('[Voice] Speech recognition not supported in this browser');
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return;
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}
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this.recognition = new SpeechRecognition();
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this.recognition.continuous = false;
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this.recognition.interimResults = false;
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this.recognition.lang = 'de-DE';
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this.recognition.onresult = (event) => {
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const text = event.results[0][0].transcript;
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console.log('[Voice] Browser STT result:', text);
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this.lastInputWasVoice = true;
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if (this.onResult) this.onResult(text);
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};
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this.recognition.onend = () => {
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console.log('[Voice] Browser STT ended');
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this.isRecording = false;
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if (this.onStateChange) this.onStateChange(false);
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};
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this.recognition.onerror = (event) => {
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console.error('[Voice] Browser STT error:', event.error);
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this.isRecording = false;
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if (this.onStateChange) this.onStateChange(false);
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if (event.error === 'not-allowed') {
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showToast('Microphone access denied. Please allow microphone in browser settings.', 'error');
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} else if (event.error === 'no-speech') {
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showToast('No speech detected. Try again.', 'error');
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}
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};
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console.log('[Voice] Browser STT initialized');
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}
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async startRecording() {
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this.isRecording = true;
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this.lastInputWasVoice = true;
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if (this.onStateChange) this.onStateChange(true);
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if (this.mode === 'api') {
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// API mode — record audio via MediaRecorder, send to Whisper
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try {
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const stream = await navigator.mediaDevices.getUserMedia({ audio: true });
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this.audioChunks = [];
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this.mediaRecorder = new MediaRecorder(stream);
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this.mediaRecorder.ondataavailable = (event) => {
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this.audioChunks.push(event.data);
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};
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this.mediaRecorder.onstop = async () => {
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stream.getTracks().forEach(track => track.stop());
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const blob = new Blob(this.audioChunks, { type: 'audio/webm' });
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await this._transcribeAPI(blob);
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};
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this.mediaRecorder.start();
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console.log('[Voice] API recording started');
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} catch (e) {
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console.error('[Voice] Microphone access error:', e);
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showToast('Microphone access denied', 'error');
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this.isRecording = false;
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if (this.onStateChange) this.onStateChange(false);
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}
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} else {
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// Browser mode — use Web Speech API
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if (this.recognition) {
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try {
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this.recognition.start();
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console.log('[Voice] Browser STT started');
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} catch (e) {
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console.error('[Voice] Failed to start recognition:', e);
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this.isRecording = false;
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if (this.onStateChange) this.onStateChange(false);
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showToast('Voice recognition failed to start. Try again.', 'error');
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}
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} else {
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console.warn('[Voice] No speech recognition available');
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showToast('Speech recognition not supported in this browser', 'error');
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this.isRecording = false;
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if (this.onStateChange) this.onStateChange(false);
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}
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}
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}
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stopRecording() {
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console.log('[Voice] Stopping recording...');
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if (this.mode === 'api') {
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if (this.mediaRecorder && this.mediaRecorder.state === 'recording') {
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this.mediaRecorder.stop();
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} else {
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this.isRecording = false;
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if (this.onStateChange) this.onStateChange(false);
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}
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} else {
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if (this.recognition) {
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try {
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this.recognition.stop();
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} catch (e) {
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// Already stopped
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}
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}
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this.isRecording = false;
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if (this.onStateChange) this.onStateChange(false);
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}
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}
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async _transcribeAPI(blob) {
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try {
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const formData = new FormData();
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formData.append('audio', blob, 'recording.webm');
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console.log('[Voice] Sending audio to API for transcription...');
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const response = await api('/voice/transcribe', {
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method: 'POST',
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body: formData,
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});
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if (response?.ok) {
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const data = await response.json();
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console.log('[Voice] API transcription result:', data.text);
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this.lastInputWasVoice = true;
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if (this.onResult) this.onResult(data.text);
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} else {
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showToast('Transcription failed. Falling back to browser voice.', 'error');
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// Fallback: switch to browser mode for this session
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this.mode = 'browser';
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}
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} catch (e) {
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console.error('[Voice] API transcription error:', e);
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showToast('Transcription error', 'error');
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} finally {
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this.isRecording = false;
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if (this.onStateChange) this.onStateChange(false);
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}
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}
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async speak(text) {
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if (this.mode === 'api') {
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return this._speakAPI(text);
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} else {
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return this._speakBrowser(text);
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}
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}
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_speakBrowser(text) {
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return new Promise((resolve) => {
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// Cancel any ongoing speech
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this.synthesis.cancel();
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const utterance = new SpeechSynthesisUtterance(text);
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utterance.lang = 'de-DE';
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utterance.rate = 0.95;
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utterance.onend = resolve;
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utterance.onerror = () => {
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console.warn('[Voice] Browser TTS error');
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resolve();
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};
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this.synthesis.speak(utterance);
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});
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}
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async _speakAPI(text) {
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try {
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const response = await api(`/voice/synthesize?text=${encodeURIComponent(text)}`, {
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method: 'POST',
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});
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if (response?.ok) {
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const audioBlob = await response.blob();
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const audioUrl = URL.createObjectURL(audioBlob);
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const audio = new Audio(audioUrl);
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await audio.play();
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return new Promise(resolve => {
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audio.onended = resolve;
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});
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}
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} catch (e) {
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console.warn('[Voice] API TTS failed, falling back to browser');
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}
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// Fallback to browser TTS
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return this._speakBrowser(text);
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}
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toggleRecording() {
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if (this.isRecording) {
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this.stopRecording();
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} else {
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this.startRecording();
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}
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}
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}
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