keolis-services/services/voiceDectector.js

Keolis services includes Microphone, Location, Voice Activity Detector, Heart rate through web bluetooth API, text to speech, stop watch with our own cloud.

const { startRecording, stopRecording } = require('../services/record');
const vad = require('@mjyc/voice-activity-detection');

navigator.mediaDevices.getUserMedia({ audio: true });

var audioContext;

export const startVoiceDetect = () => {
    try {
        window.AudioContext = window.AudioContext || window.webkitAudioContext;
        audioContext = new AudioContext();

        navigator.getUserMedia = navigator.getUserMedia || navigator.webkitGetUserMedia || navigator.mozGetUserMedia || navigator.msGetUserMedia;
        navigator.getUserMedia({ audio: true }, startUserMedia, handleMicConnectError);
    } catch (e) {
        handleUserMediaError();
    }
}

const handleUserMediaError = () => {
    console.warn('Mic input is not supported by the browser.');
}

const handleMicConnectError = () => {
    console.warn('Could not connect microphone. Possible rejected by the user or is blocked by the browser.');
}

let isStartRecording = false;
const startUserMedia = (stream) => {
    var options = {
        minNoiseLevel: 0.92,
        maxNoiseLevel: 1,
        avgNoiseMultiplier: 1,
        onVoiceStart: function() {
            console.info('voice Detected!!!!!!');
            if (document.getElementById('voice-detector-status')) document.getElementById('voice-detector-status').innerHTML = 'Voice detected';
            isStartRecording = true;
            startRecording();
            setTimeout(function() {
                console.log('Recording stopped')
                stopRecording();
                isStartRecording = false;
            }, 5000);
            return true;
        },
        onVoiceStop: function() {
            if (!isStartRecording) audioContext.resume();
        },
        onUpdate: function(val) {}
    };
    vad(audioContext, stream, options);
}
setInterval(function() { 
    if (!isStartRecording && audioContext) {
        audioContext.resume();
        if (document.getElementById('voice-detector-status')) document.getElementById('voice-detector-status').innerHTML = '';
    }
}, 2000);