问题描述
我一直在尝试遵循一些教程中的步骤，使用Web Audio API通过按钮播放简单的，编码的本地wav或mp3文件.我的代码如下(testAudioAPI.js):
I've been trying to follow the steps in some tutorials for playback of a simple, encoded local wav or mp3 file with the web Audio API using a button. My code is the following (testAudioAPI.js):
window.AudioContext = window.AudioContext || window.webkitAudioContext;
var context = new AudioContext();
var myBuffer;
clickme = document.getElementById('clickme');
clickme.addEventListener('click',clickHandler);
var request = new XMLHttpRequest();
request.open('GET', 'WoodeBlock_SMan_B.wav', true);
request.responseType = 'arraybuffer';
// Decode asynchronously
request.onload = function() {
context.decodeAudioData(request.response, function(theBuffer) {
myBuffer = theBuffer;
}, onError);
}
request.send();
function playSound(buffer) {
var source = context.createBufferSource(), g = context.createGain();
source.buffer = buffer;
source.start(0);
g.gain.value = 0.5;
source.connect(g);
g.connect(context.destination);
}
function clickHandler(e) {
playSound(myBuffer);
}
HTML文件如下所示:
And the HTML file would look like this:
<!doctype html>
<html>
<body>
<button id="clickme">Play</button>
<script src='testAudioAPI.js'></script>
</body>
</html>
但是，没有任何声音.我已经尝试了多个代码段，但仍然无法弄清楚.当我尝试通过创建振荡器节点来通过合成声音来生成声音时，我确实会获得声音，但是没有本地文件的缓冲区.这是什么问题?谢谢你们.
However, no sound is achieved whatsoever. I've tried several snippets but I still can't figure it out. When I try to generate a sound by synthesizing it by creating an oscillator node, I do get sound, but not with buffers from local files. What would be the problem here? Thank you all.
推荐答案
本地文件，是吗?您是从文件系统(例如"file://")中获取它们，还是正在运行本地Web服务器?
Local files, huh? Are you just grabbing them from the filesystem (e.g. "file://"), or do you have a local web server running?
据我回忆，在大多数(所有?)浏览器中，直接从文件系统提供服务都违反了CORS，这将阻止您的AJAX请求成功.
From what I recall, serving directly from the filesystem violates CORS in most (all?) browsers – which will prevent your AJAX request from succeeding.
也许可以尝试使用python -m SimpleHTTPServer或类似名称投放页面，然后通过 http://localhost:8000 访问该页面
Maybe try serving the page with python -m SimpleHTTPServer or similar, and then access it at http://localhost:8000.
据我所知，您所有的代码看起来都很好.
From what I can tell, all of your code looks fine.
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