D36_音樂檔及麥克風同時讀取音訊資料的操作

14th鐵人賽 p5.js

jasonlee2357

2022-11-08 18:41:10

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音樂檔及麥克風同時讀取音訊資料的操作

今天來整理一下，利用p5.sound.js套件，同時讀取音樂檔及麥克風音訊資料的操作

完整的程式碼整理如下
HTML

<!DOCTYPE html>
<html lang="en">

<head>
	<meta charset="utf-8" />
	<!-- keep the line below for OpenProcessing compatibility -->
	<script src="https://openprocessing.org/openprocessing_sketch.js"></script>
	<script src="https://cdnjs.cloudflare.com/ajax/libs/p5.js/1.5.0/p5.js"></script>
	<script src="https://cdnjs.cloudflare.com/ajax/libs/p5.js/1.5.0/addons/p5.sound.js"></script>
	<script src="mySketch.js"></script>
	<link rel="stylesheet" type="text/css" href="style.css">
</head>

<body></body>
</html>

CSS

html,
body {
	margin: 0;
	padding: 0;
}

let can;
let sound;
let mic;
let amplitude;
let fft;
let fft_mic;
let spectrum;
let spectrum_mic;
function preload(){
    sound = loadSound('assets/canon.mp3');
}
function setup() {

	can = createCanvas(400, 400);
	can.id("can1");
	can.class("c1");
	can.position(10, 10);
	background(0);

    fft = new p5.FFT();
    fft_mic = new p5.FFT();

    amplitude = new p5.Amplitude();
    amplitude.setInput(sound);
    fft.setInput(sound);

    mic = new p5.AudioIn();
    mic.getSources(gotSources); 
    
    fft_mic.setInput(mic);
}

function gotSources(devices) {
  let device_name = "外接麥克風";
  devices.forEach( (dev, index) => {
    console.log(dev.label);
    if(dev.label.indexOf(device_name) != -1 && dev.kind == 'audioinput'){
    if(mic_st==0){
        mic.setSource(index);
        fft_mic.setInput(mic);
        
        console.log("mic.currentSource: "+mic.currentSource+", index:"+index);
        let currentSource = devices[mic.currentSource];
        console.log(currentSource.deviceId+","+currentSource.label);
        mic.start();
        mic_st = 1;
        } 
    } 
  });
}

let size1 = 0;
let size1_mic = 0;
function draw() {
    background(0, 20);
    drawAmplitude();
    drawFFT();
}

function drawAmplitude(){
    let level = amplitude.getLevel();
    let level_mic = mic.getLevel();
    
    //---- sound amplitude---
    let size = map(level, 0, 1, 0, 2000);
    size1 = size1 + (size-size1)*0.5;
    noFill();
    stroke(255);
    strokeWeight(3);
    ellipse(width/2-100, height/2, size1, size1);

    //---- mic amplitude-----
    let size_mic = map(level_mic, 0, 1, 0, 800);
    size1_mic = size1_mic + (size_mic-size1_mic)*0.5;
    noFill();
    stroke(255, 255, 0);
    strokeWeight(3);
    ellipse(width/2+100, height/2, size1_mic, size1_mic);
}

function drawFFT(){
    spectrum = fft.analyze();
    spectrum_mic = fft_mic.analyze();
    
    //---- sound fft---
    let sp_len = spectrum.length;
    for(let i=0; i<sp_len; i++) {
		let x = map(i, 0, sp_len, 0, 400);
		stroke(255, 130);
		line(x, 380, x, 380 - map(spectrum[i], 0, 255, 0, 300));
	}
    
    //---- mic fft---
    let sp_len_mic = spectrum_mic.length;
    for(let i=0; i<sp_len_mic; i++) {
		let x = map(i, 0, sp_len_mic, 0, 400);
		stroke(255, 255, 0, 50);
		line(x, 380, x, 380 - map(spectrum_mic[i], 0, 255, 0, 300));
	}
}

let mic_st = 0;
function keyPressed(e) {
	console.log(e);
    if(e.key == 'a'){
        if(mic_st==0){
            mic.start();
            mic_st = 1;
        } else {
            mic.stop();
            mic_st = 0;
        }
    } else

    if(e.key == 'b'){
        if(sound.isPlaying()){
            sound.pause();
        } else {
            sound.play() ;
        }

    }
}

console.log的輸出資訊