我在网页上有一个音频元素,我需要向该元素添加一个 id 标签“播放器”。我正在使用 getElementById("player")。
问题中的元素:
<audio id="player" controls loop>
<source src="Out_of_the_Skies_Under_the_Earth.mp3" type="audio/mp3">
</audio>
我使用“播放器”标签使接下来的两行有用,使用 Web 音频 API:
var mediaElement = document.getElementById('player');
var sourceNode = context.createMediaElementSource(mediaElement);
这是我唯一使用 ID“玩家”的地方,我对任何替代方案持开放态度。
当我添加 id 标签时,音频不会在 Chrome 中播放(它会在没有标签的情况下播放)。它可以在 Safari 和 Opera 中正常播放,但不能在 Chrome 中播放。我尝试使用 .ogg 将文件并轨到较小的位/采样率,改用 getElementByClassName,但似乎没有任何效果。
编辑: 另外,我想指出播放器确实显示了正确的音频文件长度 (6:03),并且显示了进度条的移动和正确的时间更新。就好像声音被静音了一样。
由于我的音频文件是本地的,所以这段代码不一定是我遇到的问题。
自从发布这篇文章后,我注意到我收到错误:“由于 [本地文件] 的 CORS 访问限制,MediaElementAudioSource 输出零”我认为在我自己的域下托管具有所需 CORS header 的文件可能会修复问题。我现在没有时间实现这个,但我会在下面的答案中更新我的解决方案。
但与此同时,任何建议都会很棒。
var ctx = window.AudioContext || window.webkitAudioContext;
var context = new ctx();
var mediaElement = document.getElementById('player');
var sourceNode = context.createMediaElementSource(mediaElement);
// create the equalizer. It's a set of biquad Filters
var filters = [];
// Set filters
[60, 170, 350, 1000, 3500, 10000].forEach(function(freq, i) {
var eq = context.createBiquadFilter();
eq.frequency.value = freq;
eq.type = "peaking";
eq.gain.value = 0;
filters.push(eq);
});
// Connect filters in serie
sourceNode.connect(filters[0]);
for(var i = 0; i < filters.length - 1; i++) {
filters[i].connect(filters[i+1]);
}
// connect the last filter to the speakers
filters[filters.length - 1].connect(context.destination);
function changeGain(sliderVal,nbFilter) {
var value = parseFloat(sliderVal);
filters[nbFilter].gain.value = value;
// update output labels
var output = document.querySelector("#gain"+nbFilter);
output.value = value + " dB";
}
div audio {
display: block;
margin-bottom:10px;
}
.eq {
margin: 32px;
border:1px solid;
border-radius:15px;
background-color:lightGrey;
padding:10px;
width:300px;
box-shadow: 10px 10px 5px grey;
text-align:center;
font-family: "Open Sans";
font-size: 12px;
}
div.controls:hover {
color:blue;
font-weight:bold;
}
div.controls label {
display: inline-block;
text-align: center;
width: 50px;
}
div.controls label, div.controls input, output {
vertical-align: middle;
padding: 0;
margin: 0;
font-family: "Open Sans",Verdana,Geneva,sans-serif,sans-serif;
font-size: 12px;
}
<!DOCTYPE html>
<html lang="en" >
<head>
<meta charset="UTF-8">
<title>Equalizer with Bi-Quad Filters</title>
<link rel="stylesheet" href="css/style.css">
</head>
<body>
<html lang="en">
<head>
</head>
<body>
<div class="eq">
<audio id="player" controls crossorigin="anonymous" loop>
<source src="https://vocaroo.com/i/s1lfs67BmoTC">
</audio>
<div class="controls">
<label>60Hz</label>
<input type="range" value="0" step="1" min="-30" max="30" oninput="changeGain(this.value, 0);"></input>
<output id="gain0">0 dB</output>
</div>
<div class="controls">
<label>170Hz</label>
<input type="range" value="0" step="1" min="-30" max="30" oninput="changeGain(this.value, 1);"></input>
<output id="gain1">0 dB</output>
</div>
<div class="controls">
<label>350Hz</label>
<input type="range" value="0" step="1" min="-30" max="30" oninput="changeGain(this.value, 2);"></input>
<output id="gain2">0 dB</output>
</div>
<div class="controls">
<label>1000Hz</label>
<input type="range" value="0" step="1" min="-30" max="30" oninput="changeGain(this.value, 3);"></input>
<output id="gain3">0 dB</output>
</div>
<div class="controls">
<label>3500Hz</label>
<input type="range" value="0" step="1" min="-30" max="30" oninput="changeGain(this.value, 4);"></input>
<output id="gain4">0 dB</output>
</div>
<div class="controls">
<label>10000Hz</label>
<input type="range" value="0" step="1" min="-30" max="30" oninput="changeGain(this.value, 5);"></input>
<output id="gain5">0 dB</output>
</div>
</div>
</body>
</html>
<script src="js/index.js"></script>
</body>
</html>
最佳答案
网址设置为<source>
元素 src
属性不与 CORS header 一起提供,也不是 .mp3
文件。
避免
MediaElementAudioSource outputs zeroes due to CORS access restrictions for <URL>
错误,可以使用fetch()
, Body.blob()
获取由 Access-Control-Allow-Origin
提供的资源 header ,URL.createObjectURL()
转换 Blob
到 Blob URL
, 然后设置 <audio>
元素 src
到 Blob URL
.
另请注意 <input>
标签是自动关闭的;和 filters
应该全局定义。
var ctx = window.AudioContext || window.webkitAudioContext;
var context = new ctx();
var url = "https://ia600305.us.archive.org/30/items/return_201605/return.mp3";
var filters = [];
fetch(url)
.then(response => response.blob())
.then(blob => {
var blobURL = URL.createObjectURL(blob);
var mediaElement = document.getElementById('player');
mediaElement.src = blobURL;
var sourceNode = context.createMediaElementSource(mediaElement);
// create the equalizer. It's a set of biquad Filters
// Set filters
[60, 170, 350, 1000, 3500, 10000].forEach(function(freq, i) {
var eq = context.createBiquadFilter();
eq.frequency.value = freq;
eq.type = "peaking";
eq.gain.value = 0;
filters.push(eq);
});
// Connect filters in serie
sourceNode.connect(filters[0]);
for (var i = 0; i < filters.length - 1; i++) {
filters[i].connect(filters[i + 1]);
}
// connect the last filter to the speakers
filters[filters.length - 1].connect(context.destination);
});
function changeGain(sliderVal, nbFilter) {
var value = parseFloat(sliderVal);
filters[nbFilter].gain.value = value;
// update output labels
var output = document.querySelector("#gain" + nbFilter);
output.value = value + " dB";
}
div audio {
display: block;
margin-bottom: 10px;
}
.eq {
margin: 32px;
border: 1px solid;
border-radius: 15px;
background-color: lightGrey;
padding: 10px;
width: 300px;
box-shadow: 10px 10px 5px grey;
text-align: center;
font-family: "Open Sans";
font-size: 12px;
}
div.controls:hover {
color: blue;
font-weight: bold;
}
div.controls label {
display: inline-block;
text-align: center;
width: 50px;
}
div.controls label,
div.controls input,
output {
vertical-align: middle;
padding: 0;
margin: 0;
font-family: "Open Sans", Verdana, Geneva, sans-serif, sans-serif;
font-size: 12px;
}
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Equalizer with Bi-Quad Filters</title>
</head>
<body>
<div class="eq">
<audio id="player" controls crossorigin="anonymous" loop></audio>
<div class="controls">
<label>60Hz</label>
<input type="range" value="0" step="1" min="-30" max="30" oninput="changeGain(this.value, 0);">
<output id="gain0">0 dB</output>
</div>
<div class="controls">
<label>170Hz</label>
<input type="range" value="0" step="1" min="-30" max="30" oninput="changeGain(this.value, 1);">
<output id="gain1">0 dB</output>
</div>
<div class="controls">
<label>350Hz</label>
<input type="range" value="0" step="1" min="-30" max="30" oninput="changeGain(this.value, 2);">
<output id="gain2">0 dB</output>
</div>
<div class="controls">
<label>1000Hz</label>
<input type="range" value="0" step="1" min="-30" max="30" oninput="changeGain(this.value, 3);">
<output id="gain3">0 dB</output>
</div>
<div class="controls">
<label>3500Hz</label>
<input type="range" value="0" step="1" min="-30" max="30" oninput="changeGain(this.value, 4);">
<output id="gain4">0 dB</output>
</div>
<div class="controls">
<label>10000Hz</label>
<input type="range" value="0" step="1" min="-30" max="30" oninput="changeGain(this.value, 5);">
<output id="gain5">0 dB</output>
</div>
</div>
</body>
</html>
关于javascript - id 标签导致音频无法在 chrome 中播放,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/48370887/