Javascript Oscillation / DTMF Songs

dtmf_oscillation_songs.js

#!/usr/bin/env node

var dtmf = {
    "0":{ "hf": "1336", "lf": "941" },
    "1":{ "hf": "1209", "lf": "697" },
    "2":{ "hf": "1336", "lf": "697" },
    "3":{ "hf": "1477", "lf": "697" },
    "4":{ "hf": "1209", "lf": "770" },
    "5":{ "hf": "1336", "lf": "770" },
    "6":{ "hf": "1477", "lf": "770" },
    "7":{ "hf": "1209", "lf": "852" },
    "8":{ "hf": "1336", "lf": "852" },
    "9":{ "hf": "1477", "lf": "852" },
    "*":{ "hf": "1209", "lf": "941" },
    "#":{ "hf": "1477", "lf": "941" },
    "A":{ "hf": "1633", "lf": "697" },
    "B":{ "hf": "1633", "lf": "770" },
    "C":{ "hf": "1633", "lf": "852" },
    "D":{ "hf": "1633", "lf": "941" }
}

async function playDTMF(key, duration){
    highFrequency = parseInt(dtmf[key].hf);
    lowFrequency = parseInt(dtmf[key].lf);
    
    var audioCtx = new (window.AudioContext || window.webkitAudioContext)();
    var oscillatorHigh = audioCtx.createOscillator();
    var oscillatorLow = audioCtx.createOscillator();
    
    oscillatorHigh.frequency.setValueAtTime(highFrequency, audioCtx.currentTime);
    oscillatorLow.frequency.setValueAtTime(lowFrequency, audioCtx.currentTime);

    oscillatorHigh.connect(audioCtx.destination);
    oscillatorLow.connect(audioCtx.destination);

    oscillatorHigh.start();
    oscillatorLow.start();

    var stopTime = audioCtx.currentTime + duration;
    oscillatorHigh.stop(stopTime);
    oscillatorLow.stop(stopTime);

    await new Promise((resolve) => setTimeout(resolve, duration * 1500));
}

function rest(duration) {
    return new Promise(resolve => setTimeout(resolve, duration * 1000));
}

short = 0.2
long = 0.4

/*
------------------------------------------------
    Mary Had A Little Lamb
------------------------------------------------

await playDTMF("3", short);
await playDTMF("2", short);
await playDTMF("1", short);
await playDTMF("2", short);
await playDTMF("3", short);
await playDTMF("3", short);
await playDTMF("3", long);
await playDTMF("2", short);
await playDTMF("2", short);
await playDTMF("2", long);
await playDTMF("3", short);
await playDTMF("9", short);
await playDTMF("9", long);
await playDTMF("3", short);
await playDTMF("2", short);
await playDTMF("1", short);
await playDTMF("2", short);
await playDTMF("3", short);
await playDTMF("3", short);
await playDTMF("3", short);
await playDTMF("3", short);
await playDTMF("2", short);
await playDTMF("2", short);
await playDTMF("3", short);
await playDTMF("2", short);
await playDTMF("1", long);
*/


/*
------------------------------------------------
    Frere Jacques
------------------------------------------------
*/
await playDTMF("1", short);
await playDTMF("2", short);
await playDTMF("3", short);
await playDTMF("1", short);

await playDTMF("1", short);
await playDTMF("2", short);
await playDTMF("3", short);
await playDTMF("1", short);

await playDTMF("3", short);
await playDTMF("6", short);
await playDTMF("9", short);
await rest(0.4);

await playDTMF("3", short);
await playDTMF("6", short);
await playDTMF("9", short);
await rest(0.4);

await playDTMF("9", short);
await playDTMF("#", short);
await playDTMF("9", short);
await playDTMF("6", short);
await playDTMF("3", short);
await playDTMF("1", short);

await playDTMF("9", short);
await playDTMF("#", short);
await playDTMF("9", short);
await playDTMF("6", short);
await playDTMF("3", short);
await playDTMF("1", short);

await playDTMF("7", short);
await playDTMF("1", short);
await playDTMF("7", short);
await rest(0.4);

await playDTMF("7", short);
await playDTMF("1", short);
await playDTMF("7", short);
await rest(0.2);