本文实例为大家分享了js通过audioContext实现3D音效的具体代码，供大家参考，具体内容如下
前言
AudioContext的setPosition实现3D音效
效果展示
代码展示
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<!DOCTYPE html><html lang="en"><head> <meta charset="UTF-8"> <title>3D Audio</title> <style> body, div{ margin: 0px; padding: 0px; text-align: center; } #cav{ border: 1px solid black; border-radius: 4px; margin: 10px auto; } </style></head><body><canvas id="cav" width="320" height="200"></canvas></body><script> let Aud = function (ctx, url) { this.ctx = ctx; this.url = url;// source节点 this.src = ctx.createBufferSource();// 多个处理节点组 this.pNode = []; }; Aud.prototype = { output(){ for (let i = 0; i < this.pNode.length; i++){ let tNode = this.src; for (let j = 0; j < this.pNode[i].length; j++){ tNode.connect(this.pNode[i][j]); tNode = this.pNode[i][j]; } tNode.connect(this.ctx.destination); } }, play(loop){ this.src.loop = loop || false; this.output(); this.src.start(0); }, stop() { this.src.stop(); }, addNode(node, groupIdx = 0){ this.pNode[groupIdx] = this.pNode[groupIdx] || []; this.pNode[groupIdx].push(node); } }; //设置节点类型 Aud.NODETYPE = { GNODE: 0 // 表示gainNode节点 } //Aud管理对象 AudManager = { urls: [], items: [], ctx: null, init(){ try{ this.ctx = new AudioContext(); }catch (e) { console.log(`${e}`); } }, load(callback){ for (let i = 0; i < this.urls.length; i++){ this.loadSingle(this.urls[i], callback); } }, loadSingle(url, callback){ let req = new XMLHttpRequest(); req.open('GET', url, true); req.responseType = 'arraybuffer'; let self = this; req.onload = function () { self.ctx.decodeAudioData(this.response) .then( buf => { let aud = new Aud(self.ctx, url); aud.src.buffer = buf; self.items.push(aud); if (self.items.length == self.urls.length){ callback(); } }, err => { console.log(`decode error:${err}`); } ) }; req.send(); }, createNode(nodeType, param){ let node = null; switch (nodeType) { case 1: node = this.ctx.createPanner(); break; case 2: node = this.ctx.createScriptProcessor(param[0], param[1], param[2]); break; default: node = this.ctx.createGain(); } return node; } }; let ctx = document.getElementById('cav').getContext('2d');// 定义移动点坐标 let cX = 190, cY = 100, deg = 0; window.onload = function (){ init(); } function renderCir(x, y, r, col){ ctx.save(); ctx.beginPath(); ctx.arc(x, y, r, 0, Math.PI*2); ctx.closePath(); ctx.fillStyle = col; ctx.fill(); ctx.restore(); } function renderCenter(){ renderCir(160, 100, 8, "red"); } function renderCat() { renderCir(cX, cY, 8, "blue"); } function init(){ AudManager.urls = ["test.mp3"]; AudManager.init(); AudManager.load(()=>{ let pNod1 = AudManager.createNode(1); let sound1 = AudManager.items[0]; sound1.addNode(pNod1); sound1.play(true); timeHandle(); }); } function timeHandle() { window.setInterval(()=>{ ctx.clearRect(0,0,320,200); let rad = Math.PI*deg / 180; let sx = 90*Math.cos(rad), sy = 90*Math.sin(rad); cX = 160 + sx; cY = 100 + sy; AudManager.items[0].pNode[0][0].setPosition(sx*0.1, -sy*0.1, 0); renderCenter(); renderCat(); deg++; }, 30); }</script></html> |
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持服务器之家。
原文链接：https://blog.csdn.net/u013362192/article/details/115475541
