我有一个HTML页面,我想展示一个用于演示本地存储的MP3的音频可视化器类。
<!doctype html>
<html>
<head>
<header name = "Access-Control-Allow-Origin" value = "*" />
<style type = "text/css">
div#mp3_player{ width: 500px; height: 60px; background: #000; padding: 5px; margin: 50px auto;}
div#mp3_player > div > audio{ width: 500px; background: #000; float: left; }
div#mp3_player > canvas { width: 500px; height: 30px; background: #002D3C; float: left;}
</style>
<script>
//create new instance of audio
var audio = new Audio();
audio.src = 'C:/Users/Adam/Desktop/1901.m4a';
audio.controls = true;
audio.loop = true;
audio.autoplay = true;
var canvas, ctx, source, context, analyser, fbc_array, bars, bar_x, bar_width, bar_height;
window.addEventListener("load", initMp3Player, false);
function frameLooper(){
window.webkitRequestAnimationFrame(frameLooper);
fbc_array = new Uint8Array(analyser.frequencyBinCount);
analyser.getByteFrequencyData(fbc_array);
ctx.clearRect(0, 0, canvas.width, canvas.height);
ctx.fillStyle = "#00CCFF";
bars = 100;
for (var i = 0; i < bars; i++){
bar_x = i * 3;
bar_width = 2;
bar_height = -(fbc_array[i]/2);
ctx.fillRect(bar_x, canvas.height, bar_width, bar_height);
}
}
function initMp3Player(){
document.getElementById('audio_box').appendChild(audio);
context = new AudioContext();
analyser = context.createAnalyser();
canvas = document.getElementById('analyser_render');
ctx = canvas.getContext('2d');
source = context.createMediaElementSource(audio);
source.connect(analyser);
analyser.connect(context.destination);
frameLooper();
}
</script>
</head>
<body>
<div id = "mp3_player">
<div id = "audio_box"></div>
<canvas id = "analyser_render"></canvas>
</div>
</body>
我之前已经成功使用脚本标签中除以下行以外的代码,使mp3文件自动播放:
audio.autoplay = true;
但是当我包含frameLooper函数时,出现了“MediaElementAudioSource输出零,因为由于CORS访问限制。”的消息。有没有什么办法可以规避这个问题,因为这是一个本地文件?
python -m http.server 8000
https://docs.python.org/3/library/http.server.html - 当通过http访问时,许多CORS限制变得更加合理。 - Mikko Ohtamaa